WO2013168425A1 - Pressing force adjusting device and power tool - Google Patents

Pressing force adjusting device and power tool Download PDF

Info

Publication number
WO2013168425A1
WO2013168425A1 PCT/JP2013/002971 JP2013002971W WO2013168425A1 WO 2013168425 A1 WO2013168425 A1 WO 2013168425A1 JP 2013002971 W JP2013002971 W JP 2013002971W WO 2013168425 A1 WO2013168425 A1 WO 2013168425A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressing force
workpiece
tip tool
pressing
motor
Prior art date
Application number
PCT/JP2013/002971
Other languages
French (fr)
Japanese (ja)
Inventor
賢一郎 稲垣
山田　穣
Original Assignee
パナソニック 株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by パナソニック 株式会社 filed Critical パナソニック 株式会社
Publication of WO2013168425A1 publication Critical patent/WO2013168425A1/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/06—Grinders for cutting-off
    • B24B27/08—Grinders for cutting-off being portable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power

Definitions

  • the present invention relates to a power tool to which a tip tool for processing a workpiece is driveably attached, and a pressing force adjustment device provided in the power tool and adjusting a pressing force of the tip tool against the workpiece at the time of processing the workpiece.
  • a rotating grindstone is provided at the mounting portion of the disc grinder.
  • the rotary grindstone is rotationally driven by a motor (drive source). The user presses the rotary wheel, which is driven to rotate, against the workpiece to grind the workpiece.
  • An object of the present invention is to provide a pressing force adjusting device and a power tool capable of appropriately adjusting the pressing force of a tip tool against a workpiece without reducing the machining efficiency of the workpiece.
  • a pressing force adjustment device adjusts a pressing force of the tip tool against the workpiece when pressing the tip tool of the power tool against the workpiece to process the workpiece.
  • a pressing force detection unit that detects the pressing force
  • a pressing force suppression unit that suppresses the pressing force
  • the pressing force detected by the pressing force detection unit is less than or equal to a preset setting value
  • a pressing force control unit configured to control an operation of the pressing force suppressing unit.
  • a contact member that can move relative to the tip tool according to the operation of the pressing force suppression unit and can contact the workpiece together with the tip tool.
  • the pressing force control unit causes the contact member to be brought into contact with the work together with the tip tool when the pressing force detected by the pressing force detection unit is larger than a preset setting value.
  • the operation of the pressing force suppression unit is controlled.
  • the contact members are provided on both sides of the tip tool and include a first contact portion and a second contact portion capable of contacting the work.
  • the pressing force suppressing portion preferably includes a moving mechanism for advancing the tip tool in a pressing direction of the tip tool against the work and retracting the tip tool in a direction opposite to the pressing direction.
  • the pressing force suppressing portion selectively advances the tip tool in a plurality of pressing directions of the tip tool against the work and selectively in a plurality of directions opposite to the plurality of pressing directions. It is preferable to include a moving mechanism for retracting.
  • the contact member is preferably detachably attached to the power tool.
  • a power tool includes an attachment portion for attaching the tip tool, a drive source for driving the tip tool attached to the attachment portion, and the pressing force adjusting device described above Equipped with
  • the pressing force detection unit is attached to the drive source, and the drive source is configured to move integrally with the tip tool.
  • FIG. 5 is a schematic cross-sectional view showing a state immediately before cutting and processing a workpiece in the first embodiment.
  • FIG. 2 is a schematic cross-sectional view showing a state when cutting and processing a work in the first embodiment.
  • the cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece
  • the cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece
  • the cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece
  • the cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece
  • the cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece
  • (A) is a principal part expansion disassembled perspective view of FIG. 21,
  • (b) is a schematic diagram which shows the state when inserting a shaft and a movable electrode part in ER gel in (a).
  • the cross-sectional schematic diagram of the disk grinder of 12th Embodiment. (A) is a plane schematic diagram of the disk grinder of 12th Embodiment, (b) is sectional drawing which shows the principal part of (a), (c) is a perspective view of (b).
  • (A) is a cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece
  • (b) is sectional drawing which shows the principal part of (a)
  • (c) is The perspective view of (b).
  • a disc grinder 11 functioning as an example of a power tool includes a housing 12 extending along the front-rear direction (the left-right direction in FIG. 1). At a portion near the rear end of the housing 12, a grip 13 is provided for the user to grip the disc grinder 11 when using the disc grinder 11. An opening 14 communicating the inside and the outside of the housing 12 is formed on the lower surface of the front end portion of the housing 12.
  • a rotary drive unit 15 is disposed movably along the longitudinal direction of the housing 12 at the front end in the housing 12.
  • the rotation drive unit 15 includes a case 16 and a rotation motor 17 functioning as an example of a drive source disposed in the case 16.
  • a motor output shaft 18 extending straight forward is provided on the front surface of the rotary motor 17.
  • the motor output shaft 18 rotates about an axis extending along the front-rear direction.
  • a first bevel gear 19 is provided at the tip of the motor output shaft 18.
  • a cooling fan 20 is provided at an intermediate portion of the motor output shaft 18.
  • the cooling fan 20 rotates with the rotation of the motor output shaft 18 to blow air to the rotary motor 17.
  • a through hole 21 communicating the inside and the outside of the case 16 is formed on the lower surface of the front end portion of the case 16.
  • the rotation output shaft 22 functioning as an example of a mounting portion extending along the vertical direction is inserted into the through hole 21.
  • the rotary output shaft 22 is rotatably supported by the through hole 21.
  • a second bevel gear 23 is provided at the upper end of the rotary output shaft 22.
  • the second bevel gear 23 meshes with the first bevel gear 19.
  • the lower end portion of the rotary output shaft 22 projects from the opening 14 of the housing 12 to the outside of the housing 12.
  • a disc-like cutting grindstone 24 functioning as an example of a tip tool for cutting and processing the round bar-like workpiece W is detachably attached.
  • the rotational drive force of the rotary motor 17 is transmitted to the cutting stone 24 via the motor output shaft 18, the first bevel gear 19, the second bevel gear 23, and the rotational output shaft 22. That is, the rotary motor 17 rotationally drives the cutting stone 24.
  • the front end of the peripheral portion of the rotationally driven cutting grindstone 24 is pressed against the workpiece W, and the workpiece W is cut and processed.
  • a contact member 25 is provided on the lower surface of the front end of the housing 12 so as to be able to contact the work W together with the cutting whetstone 24 when pressing the cutting whetstone 24 against the work W. It is done.
  • the contact member 25 includes a vertical portion 26 extending downward from the rear side of the opening 14 in the lower surface of the housing 12, a lower horizontal portion 27 extending forward from the lower end of the vertical portion 26, and a front surface of the vertical portion 26. And an upper horizontal portion 28 extending from the front to the front.
  • the vertical portion 26, the lower horizontal portion 27, and the upper horizontal portion 28 are formed in a substantially rectangular plate shape.
  • the distance between the lower horizontal portion 27 and the upper horizontal portion 28 in the vertical direction is set to be slightly larger than the thickness of the cutting stone 24.
  • the length (width) of the side along the short direction of both horizontal parts 27 and 28 is set to about one third of the diameter of the cutting stone 24.
  • the length of the side along the longitudinal direction of both horizontal portions 27 and 28 is set to be slightly longer than the diameter of the cutting wheel 24.
  • the front end portions (tip portions) of the two horizontal portions 27 and 28 are formed in a semicircular shape and project slightly forward of the front end of the housing 12.
  • the rotation output shaft 22 is inserted into the long hole 29.
  • the cutting wheel 24 attached to the rotary output shaft 22 is located between the lower horizontal portion 27 and the upper horizontal portion 28. Therefore, along with the movement of the rotary drive unit 15 in the front-rear direction, the cutting grindstone 24 moves along the front-rear direction.
  • a rack 30 extending straight back is provided at the center of the rear surface of the case 16 of the rotational drive unit 15.
  • a strain gauge 31 functioning as an example of a pressing force detection unit is attached.
  • the strain gauge 31 detects a pressing force F1 when pressing the cutting wheel 24 against the workpiece W.
  • a moving motor 32 with a reduction gear is fixed and disposed.
  • the move motor 32 includes a motor output shaft 33 extending straight towards the rack 30.
  • the motor output shaft 33 rotates about an axis extending along the width direction of the housing 12.
  • a pinion 34 is provided at the tip of the motor output shaft 33.
  • the pinion 34 is in mesh with the rack 30. Therefore, the rotational driving force of the moving motor 32 is transmitted to the rack 30 to move the rotational driving unit 15 along with the rack 30 in the front-rear direction.
  • the rotational drive unit 15 moves between the initial position (the position shown in FIG. 1) and the use position (the position shown in FIG. 3) by the rotational drive force of the moving motor 32.
  • the rotary output shaft 22 abuts on the rear end of the elongated hole 29 of the upper horizontal portion 28.
  • the front end of the cutting grindstone 24 is positioned (retracted) behind the front end of the contact member 25 (both horizontal portions 27 and 28).
  • the rotary output shaft 22 abuts on the front end of the elongated hole 29 of the upper horizontal portion 28.
  • the front end of the cutting wheel 24 is located (projected) on the front side of the front end of the contact member 25 (both horizontal portions 27 and 28).
  • the rack 30, the movement motor 32, the motor output shaft 33, and the pinion 34 constitute a movement mechanism.
  • This moving mechanism is capable of advancing the cutting wheel 24 in the pressing direction of the cutting wheel 24 against the workpiece W when cutting the workpiece W and retracting the cutting wheel 24 in the direction opposite to the pressing direction.
  • the moving mechanism constitutes a pressing force suppression unit that suppresses the pressing force F1 when pressing the cutting stone 24 against the workpiece W.
  • a rechargeable battery pack 35 serving as a power source of the disc grinder 11 is detachably attached.
  • the battery pack 35 is electrically connected to the power supply terminal 36 exposed at the rear end of the housing 12.
  • a main control unit 37 that centrally controls the disc grinder 11 is disposed at a position on the front side of the power supply terminal 36 in the housing 12.
  • the switch circuit 38 and the pressing force control unit 39 are arranged in line in the vertical direction.
  • the main control unit 37 is electrically connected to the power supply terminal 36, the switch circuit 38, and the pressing force control unit 39.
  • the switch circuit 38 is electrically connected to the rotary motor 17. Furthermore, the switch circuit 38 is provided with a slide switch 40 so as to be exposed from the surface of the housing 12.
  • the state of the slide switch 40 indicates that the battery pack 35 supplies power to the rotary motor 17 and the battery pack 35 does not supply power to the rotary motor 17. Switch between states. That is, the rotary motor 17 is driven by turning on the slide switch 40, and the rotary motor 17 is stopped by turning off the slide switch 40.
  • the pressing force control unit 39 is electrically connected to the strain gauge 31 and the moving motor 32.
  • the pressing force control unit 39 receives the detection signal from the strain gauge 31 and controls the driving of the moving motor 32.
  • a threshold value S used in the process of suppressing the pressing force F1 is stored.
  • the threshold value S is set in advance to a value that can prevent the pressing force F1 at the time of pressing the cutting grindstone 24 against the workpiece W in the cutting process to be too large.
  • the threshold value S is set to a value that does not easily fail due to the load that the disk grinder 11 receives at the time of use (during cutting of the work W), in consideration of the durability of the disk grinder 11.
  • the pressing force control unit 39 compares the pressing force F1 detected by the strain gauge 31 with the threshold value S according to a command from the main control unit 37. When the pressing force F1 becomes larger than the threshold value S, the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold value S.
  • the strain gauge 31, the pressing force control unit 39, and the moving mechanism (pressing force suppressing unit) constitute a pressing force adjustment device that adjusts the pressing force F1.
  • the pressing force control unit 39 controls the driving of the moving motor 32 so that the rotary drive unit 15 retracts (moves from the use position toward the initial position). Then, as shown in FIG. 5, the two tips of both horizontal portions 27 and 28 of the contact member 25 contact the work W together with the cutting stone 24.
  • the force acting on the work W from the disc grinder 11 is the pressing force F2 against the workpiece W by the lower horizontal portion 27, the pressing force F3 against the workpiece W by the upper horizontal portion 28, and the pressing force against the workpiece W by the cutting wheel 24 Distributed in three of F1. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
  • the rotary drive unit 15 moves from the initial position toward the use position.
  • the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold S.
  • the rotary drive unit 15 retracts in the direction opposite to the pressing direction of the cutting wheel 24 against the workpiece W. Therefore, when the user cuts the work W with an excessive force by the disk grinder 11, the load applied to the disk grinder 11 is reduced, so the load applied to the cutting grindstone 24 and the rotary motor 17 is also reduced. Ru. Therefore, damage to the cutting wheel 24 and failure of the rotary motor 17 due to such load can be suppressed.
  • the pressing force control unit 39 controls the drive of the moving motor 32 to cut the rotary drive unit 15. Advance in the pressing direction on the work W. That is, when the pressing force F1 becomes equal to or less than the threshold value S, the pressing force control unit 39 controls the drive of the moving motor 32 to move the rotary drive unit 15 from the initial position side toward the use position side.
  • the pressing force F1 is appropriately and automatically adjusted, and the user can cut the workpiece W efficiently.
  • the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold S. For this reason, when the user tries to cut the work W with an excessive force by the disc grinder 11, the pressing force F1 of the cutting wheel 24 against the work W can be appropriately adjusted. Therefore, since the load applied to the cutting grindstone 24 and the rotary motor 17 can be reduced, it is possible to suppress the breakage of the cutting grindstone 24 and the failure of the rotary motor 17 due to such load.
  • the disc grinder 11 moves relative to the cutting whetstone 24 in the pressing direction of the cutting whetstone 24 against the work W in accordance with the control of the driving of the moving motor 32 by the pressing force control unit 39 and A contact member 25 in contact is provided. That is, when the pressing force F1 is larger than the threshold value S, the cutting whetstone 24 retreats together with the rotary drive unit 15, so the contact member 25 contacts the workpiece W together with the cutting whetstone 24. For this reason, the force exerted on the work W from the disc grinder 11 is the pressing force F2 of the lower horizontal portion 27 against the work W, the pressing force F3 of the upper horizontal portion 28 against the work W, and the pressing force of the cutting wheel 24 against the work W It can be dispersed in three of F1. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be effectively reduced.
  • the pressing force suppression unit is a moving mechanism that enables the cutting wheel 24 to linearly advance and retract through the rotary drive unit 15 in the direction opposite to the pressing direction and the pressing direction of the cutting wheel 24 against the work W It is configured. For this reason, even if the pressing force F1 of the cutting wheel 24 against the workpiece W sharply increases and exceeds the threshold value S, the cutting wheel 24 is moved quickly to press the pressing force F1 of the cutting wheel 24 against the workpiece W.
  • the threshold value S can be quickly reduced.
  • the strain gauge 31 is provided on the case 16 of the rotary drive unit 15 that moves integrally with the cutting stone 24. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be detected with high accuracy by the strain gauge 31.
  • the disc grinder 11 of the second embodiment is provided with a lower elastic sensor 45 at the tip of the lower horizontal portion 27 for detecting the pressing force F2 of the lower horizontal portion 27 against the work W.
  • the disc grinder 11 is different from the disc grinder 11 of the first embodiment in that an upper elastic sensor 46 for detecting the pressing force F3 of the upper horizontal portion 28 against the work W is provided at the tip of the upper horizontal portion 28. Therefore, in the second embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
  • the lower elastic sensor 45 and the upper elastic sensor 46 are electrically connected to the pressing force control unit 39 (see FIG. 1).
  • the pressing force control unit 39 receives signals from the lower elastic sensor 45 and the upper elastic sensor 46. Thereby, the pressing force control unit 39 (see FIG. 1) recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are pressed against the work W.
  • the pressing force control unit 39 drives the moving motor 32 to move the rotary drive unit 15 from the initial position to the use position.
  • the cutting wheel 24 starts cutting the workpiece W.
  • the pressing force control unit 39 makes the pressing force F1 equal to or less than the threshold S as in the first embodiment.
  • the drive of the moving motor 32 is controlled.
  • the rotational drive unit 15 retracts in the direction opposite to the pressing direction of the cutting wheel 24 against the workpiece W.
  • the force exerted by the disc grinder 11 on the workpiece W is the pressing force F2 of the lower horizontal portion 27 against the workpiece W, the pressing force F3 of the upper horizontal portion 28 against the workpiece W, and the pressing force F1 of the cutting wheel 24 against the workpiece W Distributed in three. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
  • the pressing force control unit 39 controls the drive of the moving motor 32 to advance the rotary drive unit 15 in the pressing direction of the cutting stone 24 against the workpiece W.
  • the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 does not continue to exceed the threshold value S, thereby cutting via the rotary drive unit 15. Move the grinding wheel 24 forward and backward.
  • the pressing force control unit 39 (see FIG. 1) does not receive signals from the lower elastic sensor 45 and the upper elastic sensor 46. . Thereby, the pressing force control unit 39 (see FIG. 1) recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are separated from the work W. Then, the pressing force control unit 39 (see FIG. 1) drives the moving motor 32 to move the rotary drive unit 15 from the use position to the initial position.
  • the pressing force control unit 39 starts and ends the work of cutting the workpiece W by the user depending on whether the signals from the lower elastic sensor 45 and the upper elastic sensor 46 are received. The timing of can be recognized. Therefore, the pressing force control unit 39 (see FIG. 1) controls the drive of the moving motor 32 depending on whether the signals from the lower elastic sensor 45 and the upper elastic sensor 46 are received, and the cutting wheel 24 is Move forward and backward. As a result, it is possible to smoothly carry out the cutting and processing operation of the work W by the user, and to quickly finish the cutting and processing operation of the work W by the user.
  • the disc grinder 11 of the third embodiment differs from the disc grinder 11 of the second embodiment in that the strain gauges 31 are attached to the inner surface of the upper wall of the housing 12. Therefore, in the third embodiment, points different from the second embodiment will be described, and the description of the portions common to the second embodiment will be omitted or simplified.
  • the operation of the disk grinder 11 of the third embodiment is similar to the operation of the disk grinder 11 of the second embodiment.
  • the lower elastic sensor 45 and the upper elastic sensor 46 function as a pressing force detector. From the difference between the detection value by the strain gauge 31 and the two detection values by the lower elastic sensor 45 and the upper elastic sensor 46, the pressing force F1 against the workpiece W by the cutting stone 24 is obtained.
  • the strain gauge 31 Since the strain gauge 31 is attached to the housing 12, the strain gauge 31 is configured integrally with the housing 12. For this reason, it can contribute to the miniaturization of the housing 12 and the miniaturization of the disc grinder 11.
  • FIG. 10 Fourth Embodiment Next, a disk grinder 11 according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11.
  • FIG. 10 Fourth Embodiment
  • the case 16 is omitted, and the moving mechanism advances the contact member 25 in the pressing direction of the cutting stone 24 against the workpiece W or is opposite to the pressing direction. It differs from the disc grinder 11 of the third embodiment in that it is retracted in the direction. Therefore, in the fourth embodiment, points different from the third embodiment will be described, and the description of the portions common to the third embodiment will be omitted or simplified.
  • the contact member 25 is attached to the lower surface of the housing 12 so as to slide and move along the front-rear direction.
  • a rack 30 is provided which extends straight back.
  • a moving motor 32 is fixed to a side position of the rack 30 on the lower surface of the housing 12.
  • the move motor 32 includes a motor output shaft 33 extending straight towards the rack 30.
  • the motor output shaft 33 rotates about an axis extending along the width direction of the housing.
  • a pinion 34 is provided at the tip of the motor output shaft 33.
  • the pinion 34 is in mesh with the rack 30. Accordingly, the rotational driving force of the moving motor 32 is transmitted to the rack 30 to move the contact member 25 along the rack 30 along the front-rear direction.
  • the cutting stone 24 does not move in the front-rear direction.
  • the pressing force control unit 39 receives two signals from the lower elastic sensor 45 and the upper elastic sensor 46. . Thereby, the pressing force control unit 39 (see FIG. 1) recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are pressed against the work W.
  • the pressing force control unit 39 drives the moving motor 32 to retract the contact member 25 as shown in FIG. Subsequently, when the cutting wheel 24 is pressed against the workpiece W, the cutting wheel 24 starts cutting the workpiece W.
  • the pressing force control unit 39 controls the drive of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold S when the pressing force F1 of the cutting wheel 24 against the workpiece W exceeds the threshold S.
  • the member 25 is advanced in the pressing direction of the cutting wheel 24 against the work W.
  • the force acting on the work W from the disc grinder 11 is the pressing force F2 against the workpiece W by the lower horizontal portion 27, the pressing force F3 against the workpiece W by the upper horizontal portion 28, and the pressing force against the workpiece W by the cutting wheel 24 Distributed in three of F1. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
  • the pressing force control unit 39 controls the drive of the moving motor 32 to retract the contact member 25 in the direction opposite to the pressing direction of the cutting stone 24 against the work W.
  • the pressing force control unit 39 moves the contact member 25 forward and backward by controlling the driving of the moving motor 32 so that the pressing force F1 does not continue to exceed the threshold value S. .
  • the contact member 25 is moved without moving the rotary motor 17 or the cutting stone 24. Therefore, the housing 12 can be miniaturized, and hence the disk grinder 11 can be miniaturized.
  • the disc grinder 11 of the fifth embodiment is the disc grinder of the third embodiment in that the rotary drive unit 15 is disposed outside the housing 12 while the moving mechanism is provided in the housing 12. It is different from 11. Therefore, in the fifth embodiment, points different from the third embodiment will be described, and the description of the portions common to the third embodiment will be omitted or simplified.
  • the operation of the disk grinder 11 of the fifth embodiment is the same as the operation of the disk grinder 11 of the third embodiment.
  • a movement mechanism (rack 30, movement motor 32) constituting a pressing force suppression portion for suppressing the pressing force F1 when pressing the cutting stone 24 against the workpiece W in the cutting process of the workpiece W in the housing 12 , Motor output shaft 33 and pinion 34).
  • the moving mechanism is integrally formed with the housing 12, which can contribute to the miniaturization of the disc grinder 11.
  • the disc grinder 11 As shown in FIG. 14, the disc grinder 11 according to the sixth embodiment includes a contact member 25 and a moving mechanism for moving the contact member 25 integrally, and is detachably attached to the housing 12. And the disk grinder 11 of the first embodiment. Therefore, in the sixth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
  • a rack 30 extending straight back is provided at the lower end portion of the rear surface of the vertical portion 26 of the contact member 25 at the lower end portion of the rear surface of the vertical portion 26 of the contact member 25, a rack 30 extending straight back is provided.
  • the rack 30 is movably supported by the frame 47 along the front-rear direction.
  • a moving motor 32 is fixed at a side position of the rack 30 in the frame 47.
  • the move motor 32 includes a motor output shaft 33 extending straight towards the rack 30.
  • the motor output shaft 33 rotates about an axis extending along the width direction of the frame 47.
  • a pinion 34 is provided at the tip of the motor output shaft 33.
  • the pinion 34 is in mesh with the rack 30. Therefore, the contact member 25, the rack 30, and the moving motor 32 are integrally configured by the frame 47. Further, at the upper end of the rear end of the frame 47, an attaching portion 49 detachably attached to a hook portion 48 provided on the lower surface of the housing 12 is provided.
  • connection terminal 50 electrically connected to the moving motor 32 when the attachment portion 49 of the frame 47 is attached to the hook portion 48 is provided. ing.
  • the connection terminal 50 is electrically connected to the pressing force control unit 39 (see FIG. 1).
  • the operation of the disk grinder 11 of the sixth embodiment is similar to the operation of the disk grinder 11 of the fourth embodiment, as shown in FIG.
  • the disc grinder 11 of the seventh embodiment is different from the first embodiment in that the front end portion of the cutting grindstone 24 projects further forward than the contact member 25 before the slide switch 40 is turned on. Do. Therefore, in the seventh embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
  • the operation of the disc grinder 11 according to the seventh embodiment is the first embodiment except that the front end of the cutting stone 24 protrudes forward relative to the contact member 25 before the slide switch 40 is turned on. It is similar to the operation of the disk grinder 11 of the embodiment.
  • the disc grinder 11 of the eighth embodiment is provided with an air pressure actuator 55 for moving the rotary drive unit 15 along the front-rear direction by air pressure instead of the moving mechanism (pressing force suppressing portion).
  • an air pressure actuator 55 for moving the rotary drive unit 15 along the front-rear direction by air pressure instead of the moving mechanism (pressing force suppressing portion).
  • the pneumatic actuator 55 is fixedly disposed in the housing 12.
  • the pneumatic actuator 55 is provided with a rod 56 which is expanded and contracted by air pressure.
  • the tip of the rod 56 is connected to the center of the rear surface of the case 16 of the rotary drive unit 15. Therefore, the rotary drive unit 15 linearly moves between the initial position and the use position by the telescopic movement of the rod 56 accompanying the drive of the pneumatic actuator 55.
  • the pneumatic actuator 55 is electrically connected to the pressing force control unit 39 (see FIG. 1).
  • the pneumatic actuator 55 is controlled by the pressing force control unit 39 (see FIG. 1).
  • the operation of the disc grinder 11 according to the eighth embodiment is the first embodiment except that the cutting wheel 24 is linearly advanced and retracted via the rotary drive unit 15 by driving the pneumatic actuator 55 as shown in FIG. It is similar to the action of the disc grinder 11 of
  • the cutting stone 24 is moved linearly via the rotary drive unit 15 by the drive of the pneumatic actuator 55. Therefore, even when the user sharply increases the pressing force F1 of the cutting wheel 24 against the workpiece W, the load on the cutting wheel 24 and the rotary motor 17 can be flexibly alleviated.
  • the disc grinder 11 of the ninth embodiment is provided with an ER gel (Electro Rheological Gel) functioning as a pressing force suppressing portion instead of the pneumatic actuator 55, and the contact member 25 is omitted.
  • ER gel Electro Rheological Gel
  • the disk grinder 11 of the eighth embodiment points different from the eighth embodiment will be described, and the description of the portions common to the eighth embodiment will be omitted or simplified.
  • the adhesiveness of ER gel changes according to an applied voltage.
  • a cylindrical support member 51 is opened in the longitudinal direction at a position facing the rear surface of the case 16 of the rotary drive unit 15 in the housing 12. Is fixed and arranged.
  • the support member 51 includes a cylindrical support member main body 51a, a cylindrical fixed electrode portion 52 formed on the inner peripheral surface of the support member main body 51a, and a cylindrical shape formed on the inner peripheral surface of the fixed electrode portion 52.
  • ER gel 53 is formed on the inner peripheral surface of the fixed electrode portion 52.
  • the front end of a round rod-like shaft 54 is fixed to the central portion of the rear surface of the case 16 of the rotary drive unit 15.
  • a cylindrical movable electrode portion 57 is fixed to the rear end portion of the shaft 54. That is, the movable electrode portion 57 is fixed to the shaft 54 in a state in which the rear end portion of the shaft 54 is inserted into the movable electrode portion 57.
  • the rear end of the shaft 54 is inserted into the inside of the ER gel 53.
  • the outer peripheral surface of the movable electrode portion 57 is in sliding contact with the inner peripheral surface of the ER gel 53.
  • the fixed electrode unit 52 and the movable electrode unit 57 are electrically connected to the pressing force control unit 39 (see FIG. 1).
  • the pressing force control unit 39 applies a voltage between the fixed electrode unit 52 and the movable electrode unit 57. That is, the pressing force control unit 39 (see FIG. 1) adjusts the adhesiveness of the ER gel 53 by controlling the voltage applied between the fixed electrode unit 52 and the movable electrode unit 57.
  • the fixed electrode portion 52, the movable electrode portion 57, and the ER gel 53 constitute a pressing force suppression portion.
  • the pressing force control unit 39 sets the ER gel 53 such that the pressing force F1 becomes equal to or less than the threshold value S. Reduce the voltage applied to the
  • the voltage applied to the ER gel 53 is controlled such that the pressing force F1 is equal to or less than the threshold value S, thereby allowing the shaft 54 (rotational drive unit 15) to retreat. Therefore, even when the user sharply increases the pressing force F1 of the cutting wheel 24 against the workpiece W, the load on the cutting wheel 24 and the rotary motor 17 can be flexibly alleviated.
  • the disc grinder 11 of the tenth embodiment is different from the disc grinder 11 of the first embodiment in that the strain gauge 31 is attached to the motor output shaft 18 via a cylindrical bearing 59. Do. Therefore, in the tenth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
  • the operation of the disk grinder 11 of the tenth embodiment is similar to the operation of the disk grinder 11 of the first embodiment.
  • the strain gauge 31 is attached to the motor output shaft 18 via the cylindrical bearing 59. For this reason, while the transmission distance of the force from the cutting grindstone 24 to the strain gauge 31 becomes short, the force of the same direction as the pressing direction with respect to the workpiece W of the cutting grindstone 24 can be detected. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be detected with high accuracy.
  • the first bevel gear 19 and the second bevel gear 23 are not covered by the case 16 with the rotary motor 17, the motor output shaft 18, and the cooling fan 20. Is different from the disc grinder 11 of the first embodiment in that the case is covered with the case 16. Therefore, in the eleventh embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
  • the first bevel gear 19 is provided with a cylindrical connecting shaft 60 extending along the front-rear direction.
  • the connecting shaft 60 is inserted into a through hole 61 formed in the rear wall of the case 16.
  • a motor output shaft 18 extending from the front surface of the rotary motor 17 is slidably inserted along the axial direction (longitudinal direction).
  • a male spline is formed on the outer peripheral surface of the motor output shaft 18, and a female spline is formed on the inner peripheral surface of the connecting shaft 60. That is, the motor output shaft 18 and the connecting shaft 60 are so-called splined. Therefore, the rotational drive force of the rotary motor 17 is transmitted to the connecting shaft 60 via the motor output shaft 18.
  • a rack 30 extending straight back is provided.
  • a strain gauge 31 is attached at a position adjacent to the rack 30 on the rear surface of the case 16.
  • a moving motor 32 is fixedly disposed at a side position of the rack 30 on the inner surface of the lower wall of the housing 12.
  • the move motor 32 includes a motor output shaft 33 extending straight towards the rack 30.
  • the motor output shaft 33 rotates about an axis extending along the left-right direction.
  • a pinion 34 is provided at the tip of the motor output shaft 33.
  • the pinion 34 is in mesh with the rack 30. Therefore, the rotational driving force of the moving motor 32 is transmitted to the rack 30, and the case 16 is moved along with the rack 30 in the front-rear direction. That is, by the movement of the case 16 in the front-rear direction accompanying the drive of the moving motor 32, the cutting grindstone 24 moves along the front-rear direction together with the rotation output shaft 22.
  • the operation of the disc grinder 11 according to the eleventh embodiment is that the rotary motor 17, the motor output shaft 18, and the cooling fan 20 do not move along the front-rear direction as the case 16 moves in the front-rear direction. Other than that, the operation is the same as the operation of the disk grinder 11 of the first embodiment.
  • the disc grinder 11 of the twelfth embodiment differs from the disc grinder 11 of the first embodiment in that the strain gauge 31 is attached to the rotary output shaft 22 via the cylindrical bearing 62. Do. Therefore, in the twelfth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
  • the operation of the disk grinder 11 of the twelfth embodiment is similar to the operation of the disk grinder 11 of the first embodiment.
  • the strain gauge 31 is attached to the rotary output shaft 22 via the cylindrical bearing 62. Therefore, the transmission distance of the force from the cutting wheel 24 to the strain gauge 31 can be shortened, and the force in the same direction as the pressing direction of the cutting wheel 24 against the workpiece W can be detected. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be detected with high accuracy.
  • the disk grinder 11 of the thirteenth embodiment is capable of moving the cutting stone 24 not only in the front-rear direction but also in the left-right direction in order to reduce the pressing force F1.
  • a constant velocity joint 70 is provided at the center of the motor output shaft 18.
  • the first bevel gear 19 is provided with a cylindrical connecting shaft 71 extending in the front-rear direction.
  • a constant velocity joint 72 is provided at a position slightly forward of the central portion of the connecting shaft 71.
  • the front end portion of the motor output shaft 18 is slidably inserted along the axial direction (front-rear direction) from the rear side.
  • a male spline is formed on the outer peripheral surface of the motor output shaft 18, and a female spline is formed on the inner peripheral surface of the connecting shaft 71. That is, the motor output shaft 18 and the connecting shaft 71 are so-called spline connected. Therefore, the rotational force of the rotary motor 17 is transmitted to the connecting shaft 71 via the motor output shaft 18.
  • a moving unit 73 which functions as an example of the (pressing force suppressing portion).
  • the moving unit 73 includes a rectangular plate-shaped base member 74 disposed horizontally. The left half of the rear end of the base member 74 is provided with a first rack 75 extending in the left-right direction.
  • a pinion 78 provided at the tip of an output shaft 77 extending from a first motor 76 fixed to the housing 12 is in mesh with the first rack 75. Therefore, the base member 74 moves in the left-right direction by the drive of the first motor 76.
  • a guide hole 79 which is a long hole extending along the front-rear direction, is formed through. The rotation output shaft 22 is slidably inserted into the guide hole 79.
  • the guide holes 79 allow movement (sliding) of the rotational output shaft 22 in the front-rear direction, and restricts the movement of the rotational output shaft 22 in the lateral direction.
  • a slide member 80 formed in a rectangular plate shape slightly wider than the guide hole 79 is disposed. The slide member 80 is fixed to the rotation output shaft 22 in a state of being inserted into the rotation output shaft 22.
  • a second rack 81 extending in the front-rear direction is provided.
  • a worm 84 provided at the tip of an output shaft 83 extending from the second motor 82 fixed on the base member 74 meshes with the second rack 81. Therefore, the slide member 80 moves in the front-rear direction by the drive of the second motor 82.
  • the lower horizontal portion 27 and the upper horizontal portion 28 of the contact member 25 fixed to the housing 12 are formed in an annular plate shape.
  • the outer diameters of the lower horizontal portion 27 and the upper horizontal portion 28 are set to be slightly larger than the outer diameter of the cutting stone 24.
  • An elastic sensor (not shown) capable of detecting the contact position with the work W is provided on the entire peripheral surface of the lower horizontal portion 27 and the upper horizontal portion 28.
  • the elastic sensor (not shown) is electrically connected to the pressing force control unit 39 (see FIG. 1).
  • a cylindrical bearing 85 is provided at a position of the rotary output shaft 22 between the base member 74 and the cutting wheel 24.
  • Two strain gauges 31 are attached to the front surface and the right surface of the bearing 85 respectively. Each strain gauge 31 is electrically connected to the pressing force control unit 39 (see FIG. 1).
  • the pressing force control unit 39 (see FIG. 1) is electrically connected to the first motor 76 and the second motor 82.
  • the pressing force control unit 39 controls the driving of the first motor 76 and the second motor 82.
  • the pressing force control unit 39 receives a signal from an elastic sensor (not shown). Thereby, the pressing force control unit 39 (see FIG. 1) recognizes the contact position (right front in the thirteenth embodiment) of the lower horizontal portion 27 and the upper horizontal portion 28 with the work W.
  • the pressing force control unit 39 drives the first motor 76 and the second motor 82 to move the base member 74 to the right as shown in FIGS. 29 (a) to 29 (c). And the slide member 80 is moved forward. Thereby, the rotation output shaft 22 moves toward the contact position (the right front in this embodiment) with the work W in the lower horizontal portion 27 and the upper horizontal portion 28.
  • the cutting stone 24 starts cutting the workpiece W.
  • the pressing force control unit 39 makes the pressing force F1 equal to or less than the threshold S as in the first embodiment.
  • the drive of the first motor 76 and the second motor 82 is controlled. As a result, the rotational output shaft 22 retracts in the pressing direction of the cutting wheel 24 against the workpiece W.
  • a force acting on the work W from the disc grinder 11 is a pressing force F2 against the workpiece W by the lower horizontal portion 27, a pressing force F3 against the workpiece W by the upper horizontal portion 28, and a pressing force F1 against the workpiece W by the cutting wheel 24. Distributed in three. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
  • the pressing force control unit 39 controls the driving of the first motor 76 and the second motor 82 to press the rotation output shaft 22 against the workpiece W of the cutting wheel 24. Advance in direction. As described above, the pressing force control unit 39 (see FIG. 1) controls the drive of the first motor 76 and the second motor 82 so that the pressing force F1 does not continue to exceed the threshold value S, thereby outputting the rotation output. The cutting wheel 24 is moved via the shaft 22.
  • the pressing force control unit 39 (see FIG. 1) does not receive a signal from an elastic sensor (not shown), It recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are separated from the work W. Then, the pressing force control unit 39 (see FIG. 1) drives the first motor 76 and the second motor 82 so that the cutting stone 24 is accommodated between the lower horizontal portion 27 and the upper horizontal portion 28. The rotary output shaft 22 is moved back to a certain initial position.
  • the cutting wheel 24 can be moved in a plurality of pressing directions in the case of pressing the cutting wheel 24 against the work W to suppress the pressing force F1, so that the cutting work of the work W can be performed efficiently.
  • any one of the lower horizontal portion 27 and the upper horizontal portion 28 of the contact member 25 may be omitted.
  • a grinding disk or grinding disk may be used as a tip tool instead of the cutting wheel 24.
  • an air compressor may be used as a drive source instead of the rotary motor 17.
  • the torque of the rotation motor 17 is detected by the motor output shaft 18 or the rotation output shaft 22.
  • the detected torque increases sharply during cutting of the workpiece W (for example, when it exceeds a preset reference value)
  • the pressing force F1 of the cutting stone 24 against the workpiece W is adjusted to adjust the rotation motor 17 Torque may be suppressed. In this way, it is possible to suppress the failure of the disk grinder 11 due to the overload of the rotary motor 17.
  • the motor load of the rotary motor 17 is detected.
  • the detected motor load increases rapidly during cutting of the work W (for example, when it exceeds a preset reference value)
  • the pressing force F1 of the cutting stone 24 against the work W is adjusted to rotate the rotary motor 17
  • Motor load may be suppressed.
  • the motor load is detected based on motor current, motor voltage, motor rotation number, motor temperature and the like.
  • the power tool may be a power tool (rechargeable or wired) or a pneumatic tool other than the disk grinder 11.
  • a drill driver, a power cutter, a jigsaw, etc. may be mentioned.
  • a drill bit, a disk saw or the like may be used as the tip tool in accordance with the power tool.
  • the power tool is not limited to the electric tool, and may be, for example, a manual tool such as a hand drill.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Portable Power Tools In General (AREA)

Abstract

A pressing force adjusting device adjusts a pressing force of a tip tool (24) on a workpiece (W) when the tip tool (24) of a power tool (11) is pressing on the workpiece (W) and the workpiece (W) is being processed. The pressing force adjusting device comprises a pressing force detection unit (31) that detects the pressing force, pressing force suppressing units (30, 32, 33, 34) that suppress the pressing force, and a pressing force control unit (55) that controls the operation of the pressing force suppressing units (30, 32, 33, 34) so that the pressing force detected with the pressing force detection unit (31) is less than or equal to a preset setting value.

Description

押付力調整装置及び動力工具Pressing force adjustment device and power tool
　本発明は、ワークを加工する先端工具が駆動可能に取り付けられる動力工具、及び動力工具に備えられ、且つワークの加工時における先端工具のワークに対する押付力を調整する押付力調整装置に関する。 The present invention relates to a power tool to which a tip tool for processing a workpiece is driveably attached, and a pressing force adjustment device provided in the power tool and adjusting a pressing force of the tip tool against the workpiece at the time of processing the workpiece.
　動力工具の一種として、携帯用の電動式ディスクグラインダが広く知られている。ディスクグラインダの取付部には、回転砥石（先端工具）が設けられている。回転砥石（先端工具）は、モータ（駆動源）によって回転駆動される。使用者は、回転駆動された回転砥石をワークに押し付けて、ワークの研削加工を行う。 As a type of power tool, a portable motorized disc grinder is widely known. A rotating grindstone (tip tool) is provided at the mounting portion of the disc grinder. The rotary grindstone (tip tool) is rotationally driven by a motor (drive source). The user presses the rotary wheel, which is driven to rotate, against the workpiece to grind the workpiece.
　こうしたディスクグラインダによる研削加工において、通常、回転砥石をワークに押し付ける際の押付力は、使用者の力加減に応じて変化する。このため、使用者が回転砥石をワークに対して過度に押し付けた場合、ディスクグラインダに過剰な負荷がかかってしまうという問題がある。 In grinding with such a disc grinder, the pressing force at the time of pressing the rotary grindstone onto the workpiece usually changes in accordance with the degree of the user's force. For this reason, there is a problem that an excessive load is applied to the disc grinder when the user excessively presses the rotary grindstone against the work.
　そこで、従来は、回転砥石をワークに押し付ける際の押付力を表示する表示メータを備えたディスクグラインダが提案されている（例えば、特許文献１）。 Then, the disc grinder provided with the display meter which displays the pressing force at the time of pressing a grindstone to a workpiece | work conventionally is proposed (for example, patent document 1).
実開昭５６－２３５２号公報Japanese Utility Model Publication No. 56-2352
　ところで、特許文献１のディスクグラインダでは、使用者がワークを加工しながら表示メータの表示を見て回転砥石のワークに対する押付力を調整する必要がある。このため、使用者のワークに対する注意力が散漫になるので、ワークの加工効率が低下するおそれがあるという問題がある。 By the way, in the disk grinder of patent document 1, it is necessary for a user to adjust the pressing force with respect to the workpiece | work of a rotating whetstone looking at the display of a display meter, processing a workpiece | work. Therefore, the user's attention to the work is distracted, and there is a problem that the processing efficiency of the work may be reduced.
　本発明の目的は、ワークの加工効率を低下させることなく、先端工具のワークに対する押付力を適切に調整することが可能な押付力調整装置及び動力工具を提供することにある。 An object of the present invention is to provide a pressing force adjusting device and a power tool capable of appropriately adjusting the pressing force of a tip tool against a workpiece without reducing the machining efficiency of the workpiece.
　上記課題を解決するために、本発明の押付力調整装置は、動力工具の先端工具をワークに押し付けて前記ワークを加工する際に前記先端工具の前記ワークに対する押付力を調整する押付力調整装置であって、前記押付力を検出する押付力検出部と、前記押付力を抑制する押付力抑制部と、前記押付力検出部で検出された前記押付力が、予め設定された設定値以下となるように、前記押付力抑制部の動作を制御する押付力制御部とを備える。 In order to solve the above problems, a pressing force adjustment device according to the present invention adjusts a pressing force of the tip tool against the workpiece when pressing the tip tool of the power tool against the workpiece to process the workpiece. A pressing force detection unit that detects the pressing force, a pressing force suppression unit that suppresses the pressing force, and the pressing force detected by the pressing force detection unit is less than or equal to a preset setting value And a pressing force control unit configured to control an operation of the pressing force suppressing unit.
　上記構成において、前記押付力抑制部の動作に従って、前記先端工具と相対移動して、前記先端工具とともに前記ワークに接触可能な接触部材を備えることが好ましい。 In the above-described configuration, it is preferable to include a contact member that can move relative to the tip tool according to the operation of the pressing force suppression unit and can contact the workpiece together with the tip tool.
　上記構成において、前記押付力制御部は、前記押付力検出部で検出された前記押付力が、予め設定された設定値よりも大きい場合、前記接触部材を前記先端工具とともに前記ワークに接触させるように前記押付力抑制部の動作を制御することが好ましい。 In the above configuration, the pressing force control unit causes the contact member to be brought into contact with the work together with the tip tool when the pressing force detected by the pressing force detection unit is larger than a preset setting value. Preferably, the operation of the pressing force suppression unit is controlled.
　上記構成において、前記接触部材は、前記先端工具の両側に設けられ、前記ワークに接触可能な第１の接触部および第２の接触部を含むことが好ましい。 In the above configuration, preferably, the contact members are provided on both sides of the tip tool and include a first contact portion and a second contact portion capable of contacting the work.
　上記構成において、前記押付力抑制部は、前記先端工具の前記ワークに対する押し付け方向に前記先端工具を前進させるとともに前記押し付け方向とは反対方向に後退させる移動機構を含むことが好ましい。 In the above-mentioned configuration, the pressing force suppressing portion preferably includes a moving mechanism for advancing the tip tool in a pressing direction of the tip tool against the work and retracting the tip tool in a direction opposite to the pressing direction.
　上記構成において、前記押付力抑制部は、前記先端工具の前記ワークに対する複数の押し付け方向に選択的に前記先端工具を前進させるとともに前記複数の押し付け方向とは反対側の複数の方向に選択的に後退させる移動機構を含むことが好ましい。 In the above configuration, the pressing force suppressing portion selectively advances the tip tool in a plurality of pressing directions of the tip tool against the work and selectively in a plurality of directions opposite to the plurality of pressing directions. It is preferable to include a moving mechanism for retracting.
　上記構成において、前記接触部材は、前記動力工具に対して着脱可能に取り付けられることが好ましい。 In the above configuration, the contact member is preferably detachably attached to the power tool.
　上記課題を解決するために、本発明の動力工具は、前記先端工具を取り付けるための取付部と、前記取付部に取り付けられた前記先端工具を駆動する駆動源と、上記した押付力調整装置とを備える。 In order to solve the above problems, a power tool according to the present invention includes an attachment portion for attaching the tip tool, a drive source for driving the tip tool attached to the attachment portion, and the pressing force adjusting device described above Equipped with
　上記構成において、前記押付力検出部は、前記駆動源に取り付けられ、前記駆動源は、前記先端工具と一体的に移動するように構成されることが好ましい。 In the above configuration, preferably, the pressing force detection unit is attached to the drive source, and the drive source is configured to move integrally with the tip tool.
　本発明によれば、先端工具のワークに対する押付力を適切に調整することが可能な押付力調整装置及び動力工具を提供することができる。 According to the present invention, it is possible to provide a pressing force adjusting device and a power tool capable of appropriately adjusting the pressing force of the tip tool against the work.
第１実施形態のディスクグラインダの断面模式図。BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional schematic diagram of the disc grinder of 1st Embodiment. 図１の要部拡大図。The principal part enlarged view of FIG. 第１実施形態において、ワークを切断加工する直前の状態を示す断面模式図。FIG. 5 is a schematic cross-sectional view showing a state immediately before cutting and processing a workpiece in the first embodiment. 第１実施形態において、ワークを切断加工しているときの状態を示す断面模式図。FIG. 2 is a schematic cross-sectional view showing a state when cutting and processing a work in the first embodiment. 第１実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 1st Embodiment. 第２実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 2nd Embodiment. 第２実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 2nd Embodiment. 第３実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 3rd Embodiment. 第３実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 3rd Embodiment. 第４実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 4th Embodiment. 第４実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 4th Embodiment. 第５実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 5th Embodiment. 第５実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 5th Embodiment. 第６実施形態のディスクグラインダにおいて、接触部材を取り外したときの状態を示す断面模式図。The disk grinder of 6th Embodiment WHEREIN: The cross-sectional schematic diagram which shows the state when a contact member is removed. 第６実施形態のディスクグラインダにおいて、接触部材を取り付けたときの状態を示す断面模式図。The disc grinder of 6th Embodiment WHEREIN: The cross-sectional schematic diagram which shows the state when a contact member is attached. 第６実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 6th Embodiment. 第７実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 7th Embodiment. 第７実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 7th Embodiment. 第８実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 8th Embodiment. 第８実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 8th Embodiment. 第９実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 9th Embodiment. （ａ）は図２１の要部拡大分解斜視図、（ｂ）は（ａ）においてシャフト及び可動電極部をＥＲゲル内に挿嵌したときの状態を示す模式図。(A) is a principal part expansion disassembled perspective view of FIG. 21, (b) is a schematic diagram which shows the state when inserting a shaft and a movable electrode part in ER gel in (a). 第９実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。The cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone in 9th Embodiment. 第１０実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 10th Embodiment. 第１１実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disc grinder of 11th Embodiment. 第１１実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図。In 11th Embodiment, the cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting stone. 第１２実施形態のディスクグラインダの断面模式図。The cross-sectional schematic diagram of the disk grinder of 12th Embodiment. （ａ）は第１２実施形態のディスクグラインダの平面模式図、（ｂ）は（ａ）の要部を示す断面図、（ｃ）は（ｂ）の斜視図。(A) is a plane schematic diagram of the disk grinder of 12th Embodiment, (b) is sectional drawing which shows the principal part of (a), (c) is a perspective view of (b). （ａ）は第１２実施形態において、切断砥石のワークに対する押付力を調整しているときの状態を示す断面模式図、（ｂ）は（ａ）の要部を示す断面図、（ｃ）は（ｂ）の斜視図。(A) is a cross-sectional schematic diagram which shows the state when adjusting the pressing force with respect to the workpiece | work of a cutting grindstone in 12th Embodiment, (b) is sectional drawing which shows the principal part of (a), (c) is The perspective view of (b).
　（第１実施形態）
　以下、本発明の動力工具を具体化した第１実施形態の携帯型のディスクグラインダを図１～図５に従って説明する。 First Embodiment
A portable disc grinder according to a first embodiment, which embodies the power tool of the present invention, will be described below with reference to FIGS.
　図１に示すように、動力工具の一例として機能するディスクグラインダ１１は、前後方向（図１では左右方向）に沿って延びるハウジング１２を備えている。ハウジング１２における後端寄りの部分には、使用者がディスクグラインダ１１を使用する際に把持するための把持部１３が設けられている。ハウジング１２の前端部における下面には、ハウジング１２の内部と外部とを連通する開口部１４が形成されている。 As shown in FIG. 1, a disc grinder 11 functioning as an example of a power tool includes a housing 12 extending along the front-rear direction (the left-right direction in FIG. 1). At a portion near the rear end of the housing 12, a grip 13 is provided for the user to grip the disc grinder 11 when using the disc grinder 11. An opening 14 communicating the inside and the outside of the housing 12 is formed on the lower surface of the front end portion of the housing 12.
　ハウジング１２内における前端部には、回転駆動ユニット１５がハウジング１２の長手方向に沿って移動可能に配置されている。回転駆動ユニット１５は、ケース１６と、ケース１６内に配置された駆動源の一例として機能する回転モータ１７とを備えている。回転モータ１７の前面には、前方に向かって真っ直ぐに延びているモータ出力軸１８が設けられている。モータ出力軸１８は、前後方向に沿って延びる軸線を中心に回転する。モータ出力軸１８の先端には、第１傘歯車１９が設けられている。 A rotary drive unit 15 is disposed movably along the longitudinal direction of the housing 12 at the front end in the housing 12. The rotation drive unit 15 includes a case 16 and a rotation motor 17 functioning as an example of a drive source disposed in the case 16. A motor output shaft 18 extending straight forward is provided on the front surface of the rotary motor 17. The motor output shaft 18 rotates about an axis extending along the front-rear direction. A first bevel gear 19 is provided at the tip of the motor output shaft 18.
　モータ出力軸１８の中間部には、冷却ファン２０が設けられている。冷却ファン２０は、モータ出力軸１８の回転に伴って回転して、回転モータ１７に送風する。ケース１６の前端部における下面には、ケース１６の内部と外部とを連通する貫通孔２１が形成されている。貫通孔２１には、上下方向に沿って延びる取付部の一例として機能する回転出力軸２２が挿通されている。回転出力軸２２は、貫通孔２１によって回転可能に支持されている。 A cooling fan 20 is provided at an intermediate portion of the motor output shaft 18. The cooling fan 20 rotates with the rotation of the motor output shaft 18 to blow air to the rotary motor 17. A through hole 21 communicating the inside and the outside of the case 16 is formed on the lower surface of the front end portion of the case 16. The rotation output shaft 22 functioning as an example of a mounting portion extending along the vertical direction is inserted into the through hole 21. The rotary output shaft 22 is rotatably supported by the through hole 21.
　回転出力軸２２の上端には、第２傘歯車２３が設けられている。第２傘歯車２３は、第１傘歯車１９と噛合している。回転出力軸２２の下端部は、ハウジング１２の開口部１４からハウジング１２外へ突出している。回転出力軸２２の下端には、丸棒状のワークＷを切断加工するための先端工具の一例として機能する円板状の切断砥石２４が着脱可能に取り付けられている。 A second bevel gear 23 is provided at the upper end of the rotary output shaft 22. The second bevel gear 23 meshes with the first bevel gear 19. The lower end portion of the rotary output shaft 22 projects from the opening 14 of the housing 12 to the outside of the housing 12. At the lower end of the rotary output shaft 22, a disc-like cutting grindstone 24 functioning as an example of a tip tool for cutting and processing the round bar-like workpiece W is detachably attached.
　したがって、回転モータ１７の回転駆動力が、モータ出力軸１８、第１傘歯車１９、第２傘歯車２３、及び回転出力軸２２を介して切断砥石２４に伝達される。すなわち、回転モータ１７は、切断砥石２４を回転駆動する。回転駆動させた切断砥石２４の周縁部における前端がワークＷに対して押し付けられて、ワークＷの切断加工がなされる。 Therefore, the rotational drive force of the rotary motor 17 is transmitted to the cutting stone 24 via the motor output shaft 18, the first bevel gear 19, the second bevel gear 23, and the rotational output shaft 22. That is, the rotary motor 17 rotationally drives the cutting stone 24. The front end of the peripheral portion of the rotationally driven cutting grindstone 24 is pressed against the workpiece W, and the workpiece W is cut and processed.
　図１及び図２に示すように、ハウジング１２の前端部における下面には、切断砥石２４をワークＷに対して押し付ける際に切断砥石２４とともにワークＷに接触可能となるように接触部材２５が設けられている。接触部材２５は、ハウジング１２の下面における開口部１４の後側から下方に向かって延びる垂直部２６と、垂直部２６の下端から前方に向かって延びる下側水平部２７と、垂直部２６の前面から前方に向かって延びる上側水平部２８とを備えている。垂直部２６、下側水平部２７、及び上側水平部２８は、略矩形板状に形成されている。 As shown in FIGS. 1 and 2, a contact member 25 is provided on the lower surface of the front end of the housing 12 so as to be able to contact the work W together with the cutting whetstone 24 when pressing the cutting whetstone 24 against the work W. It is done. The contact member 25 includes a vertical portion 26 extending downward from the rear side of the opening 14 in the lower surface of the housing 12, a lower horizontal portion 27 extending forward from the lower end of the vertical portion 26, and a front surface of the vertical portion 26. And an upper horizontal portion 28 extending from the front to the front. The vertical portion 26, the lower horizontal portion 27, and the upper horizontal portion 28 are formed in a substantially rectangular plate shape.
　上下方向における下側水平部２７と上側水平部２８との間隔は、切断砥石２４の厚さよりも若干広くなるように設定されている。両水平部２７，２８の短手方向に沿った辺の長さ（幅）は、切断砥石２４の直径の３分の１程度に設定されている。両水平部２７，２８の長手方向に沿った辺の長さは、切断砥石２４の直径よりも若干長くなるように設定されている。両水平部２７，２８の前端部（先端部）は、半円形状に形成され、且つハウジング１２の前端よりも若干前側に突出している。 The distance between the lower horizontal portion 27 and the upper horizontal portion 28 in the vertical direction is set to be slightly larger than the thickness of the cutting stone 24. The length (width) of the side along the short direction of both horizontal parts 27 and 28 is set to about one third of the diameter of the cutting stone 24. The length of the side along the longitudinal direction of both horizontal portions 27 and 28 is set to be slightly longer than the diameter of the cutting wheel 24. The front end portions (tip portions) of the two horizontal portions 27 and 28 are formed in a semicircular shape and project slightly forward of the front end of the housing 12.
　上側水平部２８の中央部には、前後方向（上側水平部２８の長手方向）に沿って延びる長孔２９が貫通形成されている。長孔２９には、回転出力軸２２が挿通されている。回転出力軸２２に取り付けられた切断砥石２４は、下側水平部２７と上側水平部２８との間に位置している。したがって、切断砥石２４は、回転駆動ユニット１５の前後方向における移動に伴って前後方向に沿って移動する。 A long hole 29 extending in the front-rear direction (longitudinal direction of the upper horizontal portion 28) is formed through the central portion of the upper horizontal portion 28. The rotation output shaft 22 is inserted into the long hole 29. The cutting wheel 24 attached to the rotary output shaft 22 is located between the lower horizontal portion 27 and the upper horizontal portion 28. Therefore, along with the movement of the rotary drive unit 15 in the front-rear direction, the cutting grindstone 24 moves along the front-rear direction.
　図１に示すように、回転駆動ユニット１５のケース１６の後面中央部には、後方に向かって真っ直ぐに延びるラック３０が設けられている。ケース１６の後面におけるラック３０と隣り合う位置には、押付力検出部の一例として機能する歪みゲージ３１が取着されている。歪みゲージ３１は、切断砥石２４をワークＷに対して押し付ける際の押付力Ｆ１を検出する。 As shown in FIG. 1, a rack 30 extending straight back is provided at the center of the rear surface of the case 16 of the rotational drive unit 15. At a position adjacent to the rack 30 on the rear surface of the case 16, a strain gauge 31 functioning as an example of a pressing force detection unit is attached. The strain gauge 31 detects a pressing force F1 when pressing the cutting wheel 24 against the workpiece W.
　ハウジング１２内におけるラック３０の側方位置には、減速機付きの移動モータ３２が固定されて配置されている。移動モータ３２は、ラック３０に向かって真っ直ぐに延びているモータ出力軸３３を含む。モータ出力軸３３は、ハウジング１２の幅方向に沿って延びる軸線を中心に回転する。モータ出力軸３３の先端には、ピニオン３４が設けられている。ピニオン３４は、ラック３０と噛合している。したがって、移動モータ３２の回転駆動力がラック３０に伝達されて、ラック３０とともに回転駆動ユニット１５を前後方向に沿って移動させる。 At a side position of the rack 30 in the housing 12, a moving motor 32 with a reduction gear is fixed and disposed. The move motor 32 includes a motor output shaft 33 extending straight towards the rack 30. The motor output shaft 33 rotates about an axis extending along the width direction of the housing 12. A pinion 34 is provided at the tip of the motor output shaft 33. The pinion 34 is in mesh with the rack 30. Therefore, the rotational driving force of the moving motor 32 is transmitted to the rack 30 to move the rotational driving unit 15 along with the rack 30 in the front-rear direction.
　すなわち、回転駆動ユニット１５は、移動モータ３２の回転駆動力により、初期位置（図１に示す位置）と、使用位置（図３に示す位置）との間で移動する。回転駆動ユニット１５が初期位置にある場合、回転出力軸２２が上側水平部２８の長孔２９の後端に当接する。この場合、切断砥石２４の前端は、接触部材２５（両水平部２７，２８）の前端よりも後側に位置（退避）する。一方、回転駆動ユニット１５が使用位置にある場合、回転出力軸２２が上側水平部２８の長孔２９の前端に当接する。この場合、切断砥石２４の前端は、接触部材２５（両水平部２７，２８）の前端よりも前側に位置（突出）する。

　なお、第１実施形態では、ラック３０、移動モータ３２、モータ出力軸３３、及びピニオン３４により、移動機構が構成されている。この移動機構は、ワークＷを切断加工する際の切断砥石２４のワークＷに対する押し付け方向に切断砥石２４を前進させるとともに押し付け方向とは反対方向に後退させることが可能である。第１実施形態では、移動機構が、切断砥石２４をワークＷに対して押し付ける際の押付力Ｆ１を抑制する押付力抑制部を構成している。 That is, the rotational drive unit 15 moves between the initial position (the position shown in FIG. 1) and the use position (the position shown in FIG. 3) by the rotational drive force of the moving motor 32. When the rotary drive unit 15 is in the initial position, the rotary output shaft 22 abuts on the rear end of the elongated hole 29 of the upper horizontal portion 28. In this case, the front end of the cutting grindstone 24 is positioned (retracted) behind the front end of the contact member 25 (both horizontal portions 27 and 28). On the other hand, when the rotary drive unit 15 is in the use position, the rotary output shaft 22 abuts on the front end of the elongated hole 29 of the upper horizontal portion 28. In this case, the front end of the cutting wheel 24 is located (projected) on the front side of the front end of the contact member 25 (both horizontal portions 27 and 28).

In the first embodiment, the rack 30, the movement motor 32, the motor output shaft 33, and the pinion 34 constitute a movement mechanism. This moving mechanism is capable of advancing the cutting wheel 24 in the pressing direction of the cutting wheel 24 against the workpiece W when cutting the workpiece W and retracting the cutting wheel 24 in the direction opposite to the pressing direction. In the first embodiment, the moving mechanism constitutes a pressing force suppression unit that suppresses the pressing force F1 when pressing the cutting stone 24 against the workpiece W.
　
　ハウジング１２の後端には、ディスクグラインダ１１の電源となる充電可能な電池パック３５が着脱可能に取着されている。この場合、電池パック３５は、ハウジング１２の後端に露出した電源端子３６と電気的に接続されている。ハウジング１２内における電源端子３６の前側の位置には、ディスクグラインダ１１を統括的に制御するメイン制御部３７が配置されている。
At the rear end of the housing 12, a rechargeable battery pack 35 serving as a power source of the disc grinder 11 is detachably attached. In this case, the battery pack 35 is electrically connected to the power supply terminal 36 exposed at the rear end of the housing 12. A main control unit 37 that centrally controls the disc grinder 11 is disposed at a position on the front side of the power supply terminal 36 in the housing 12.
　メイン制御部３７の前側の位置には、スイッチ回路３８と、押付力制御部３９とが上下方向において並ぶように配置されている。メイン制御部３７は、電源端子３６、スイッチ回路３８、及び押付力制御部３９と電気的に接続されている。スイッチ回路３８は、回転モータ１７と電気的に接続されている。さらに、スイッチ回路３８には、ハウジング１２の表面から露出するようにスライドスイッチ４０が設けられている。 At the front position of the main control unit 37, the switch circuit 38 and the pressing force control unit 39 are arranged in line in the vertical direction. The main control unit 37 is electrically connected to the power supply terminal 36, the switch circuit 38, and the pressing force control unit 39. The switch circuit 38 is electrically connected to the rotary motor 17. Furthermore, the switch circuit 38 is provided with a slide switch 40 so as to be exposed from the surface of the housing 12.
　使用者がスライドスイッチ４０をスライド操作することで、スライドスイッチ４０の状態が、電池パック３５から回転モータ１７へ電力が供給されるオン状態と、電池パック３５から回転モータ１７へ電力が供給されないオフ状態との間で切り換えられる。すなわち、スライドスイッチ４０をオンにすることで回転モータ１７が駆動され、スライドスイッチ４０をオフにすることで回転モータ１７が停止される。 When the user slides the slide switch 40, the state of the slide switch 40 indicates that the battery pack 35 supplies power to the rotary motor 17 and the battery pack 35 does not supply power to the rotary motor 17. Switch between states. That is, the rotary motor 17 is driven by turning on the slide switch 40, and the rotary motor 17 is stopped by turning off the slide switch 40.
　押付力制御部３９は、歪みゲージ３１及び移動モータ３２と電気的に接続されている。押付力制御部３９は、歪みゲージ３１からの検出信号を受信し、移動モータ３２の駆動を制御する。 The pressing force control unit 39 is electrically connected to the strain gauge 31 and the moving motor 32. The pressing force control unit 39 receives the detection signal from the strain gauge 31 and controls the driving of the moving motor 32.
　また、押付力制御部３９には、押付力Ｆ１を抑制する処理において用いられる閾値Ｓが記憶されている。閾値Ｓは、切断加工において切断砥石２４をワークＷに対して押し付ける際の押付力Ｆ１が大きくなりすぎることを防止することが可能な値に予め設定されている。この場合、閾値Ｓは、ディスクグラインダ１１の耐久性を考慮して、ディスクグラインダ１１が使用時（ワークＷの切断加工時）に受ける負荷によって故障しにくい程度の値に設定される。 Further, in the pressing force control unit 39, a threshold value S used in the process of suppressing the pressing force F1 is stored. The threshold value S is set in advance to a value that can prevent the pressing force F1 at the time of pressing the cutting grindstone 24 against the workpiece W in the cutting process to be too large. In this case, the threshold value S is set to a value that does not easily fail due to the load that the disk grinder 11 receives at the time of use (during cutting of the work W), in consideration of the durability of the disk grinder 11.
　押付力制御部３９は、メイン制御部３７の指令により、歪みゲージ３１によって検出された押付力Ｆ１と閾値Ｓとを比較する。押付力制御部３９は、押付力Ｆ１が閾値Ｓよりも大きくなった場合に、押付力Ｆ１が閾値Ｓ以下となるように移動モータ３２の駆動を制御する。 The pressing force control unit 39 compares the pressing force F1 detected by the strain gauge 31 with the threshold value S according to a command from the main control unit 37. When the pressing force F1 becomes larger than the threshold value S, the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold value S.
　なお、本実施形態では、歪みゲージ３１、押付力制御部３９、及び移動機構（押付力抑制部）により、押付力Ｆ１を調整する押付力調整装置が構成されている。 In the present embodiment, the strain gauge 31, the pressing force control unit 39, and the moving mechanism (pressing force suppressing unit) constitute a pressing force adjustment device that adjusts the pressing force F1.
　次に、ディスクグラインダ１１の作用について説明する。 Next, the operation of the disc grinder 11 will be described.
　図１に示すように、使用者がディスクグラインダ１１のハウジング１２の把持部１３を把持した場合、スライドスイッチ４０をオンにすると、回転駆動ユニット１５が初期位置にある状態で回転モータ１７が駆動されて切断砥石２４を回転させる。続いて、図３に示すように、移動モータ３２が駆動されると、回転駆動ユニット１５が初期位置から使用位置へ移動する。図４に示すように、切断砥石２４をワークＷに対して押し付けると、切断砥石２４によってワークＷが切断され始める。 As shown in FIG. 1, when the user grips the grip 13 of the housing 12 of the disc grinder 11, when the slide switch 40 is turned on, the rotary motor 17 is driven with the rotary drive unit 15 in the initial position. The cutting stone 24 is rotated. Subsequently, as shown in FIG. 3, when the moving motor 32 is driven, the rotary drive unit 15 moves from the initial position to the use position. As shown in FIG. 4, when the cutting wheel 24 is pressed against the workpiece W, the cutting wheel 24 starts cutting the workpiece W.
　このとき、使用者が過剰な力でディスクグラインダ１１をワークＷに向けて押圧すると、切断砥石２４のワークＷに対する押付力Ｆ１が大きくなる。この押付力Ｆ１が閾値Ｓを超えると、回転駆動ユニット１５が後退（使用位置から初期位置へ向かって移動）するように、押付力制御部３９が移動モータ３２の駆動を制御する。すると、図５に示すように、接触部材２５の両水平部２７，２８の２つの先端が、切断砥石２４とともにワークＷに接触する。 At this time, when the user presses the disc grinder 11 toward the work W with an excessive force, the pressing force F1 of the cutting wheel 24 against the work W becomes large. When the pressing force F1 exceeds the threshold value S, the pressing force control unit 39 controls the driving of the moving motor 32 so that the rotary drive unit 15 retracts (moves from the use position toward the initial position). Then, as shown in FIG. 5, the two tips of both horizontal portions 27 and 28 of the contact member 25 contact the work W together with the cutting stone 24.
　これにより、ディスクグラインダ１１からワークＷに作用する力が、下側水平部２７によるワークＷに対する押付力Ｆ２、上側水平部２８によるワークＷに対する押付力Ｆ３、及び切断砥石２４によるワークＷに対する押付力Ｆ１の３つに分散される。このため、切断砥石２４のワークＷに対する押付力Ｆ１が低下する。押付力Ｆ１が再び閾値Ｓ以下になると、回転駆動ユニット１５が初期位置から使用位置へ向かって移動する。 Thereby, the force acting on the work W from the disc grinder 11 is the pressing force F2 against the workpiece W by the lower horizontal portion 27, the pressing force F3 against the workpiece W by the upper horizontal portion 28, and the pressing force against the workpiece W by the cutting wheel 24 Distributed in three of F1. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced. When the pressing force F1 falls below the threshold S again, the rotary drive unit 15 moves from the initial position toward the use position.
　このように、押付力制御部３９は、切断砥石２４のワークＷに対する押付力Ｆ１が閾値Ｓを超えると、押付力Ｆ１が閾値Ｓ以下となるように移動モータ３２の駆動を制御する。これにより、回転駆動ユニット１５は、切断砥石２４のワークＷに対する押し付け方向とは反対方向に後退する。このため、使用者がディスクグラインダ１１によって過剰な力でワークＷを切断加工しようとした場合に、ディスクグラインダ１１にかかる負荷が低減されるので、切断砥石２４や回転モータ１７にかかる負荷も低減される。したがって、こうした負荷による切断砥石２４の破損や回転モータ１７の故障が抑制される。 As described above, when the pressing force F1 of the cutting stone 24 against the workpiece W exceeds the threshold S, the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold S. Thus, the rotary drive unit 15 retracts in the direction opposite to the pressing direction of the cutting wheel 24 against the workpiece W. Therefore, when the user cuts the work W with an excessive force by the disk grinder 11, the load applied to the disk grinder 11 is reduced, so the load applied to the cutting grindstone 24 and the rotary motor 17 is also reduced. Ru. Therefore, damage to the cutting wheel 24 and failure of the rotary motor 17 due to such load can be suppressed.
　一方、押付力制御部３９は、切断砥石２４のワークＷに対する押付力Ｆ１が閾値Ｓを超えてから閾値Ｓ以下になると、移動モータ３２の駆動を制御して回転駆動ユニット１５を切断砥石２４のワークＷに対する押し付け方向に前進させる。すなわち、押付力制御部３９は、押付力Ｆ１が閾値Ｓ以下になると、移動モータ３２の駆動を制御して回転駆動ユニット１５を初期位置側から使用位置側へ向かって移動させる。 On the other hand, when the pressing force F1 of the cutting wheel 24 against the workpiece W exceeds the threshold S and becomes less than or equal to the threshold S, the pressing force control unit 39 controls the drive of the moving motor 32 to cut the rotary drive unit 15. Advance in the pressing direction on the work W. That is, when the pressing force F1 becomes equal to or less than the threshold value S, the pressing force control unit 39 controls the drive of the moving motor 32 to move the rotary drive unit 15 from the initial position side toward the use position side.
　したがって、使用者が切断砥石２４のワークＷに対する押付力Ｆ１を気にしなくても押付力Ｆ１が適切に自動的に調整されるので、使用者によりワークＷの切断加工が効率よく行われる。 Therefore, even if the user does not care about the pressing force F1 of the cutting wheel 24 against the workpiece W, the pressing force F1 is appropriately and automatically adjusted, and the user can cut the workpiece W efficiently.
　以上詳述した第１実施形態のディスクグラインダ１１によれば次のような効果が発揮される。 According to the disk grinder 11 of the first embodiment described above in detail, the following effects are exhibited.
　（１）押付力制御部３９は、歪みゲージ３１で検出される押付力Ｆ１が閾値Ｓを超えた場合に、押付力Ｆ１が閾値Ｓ以下となるように、移動モータ３２の駆動を制御する。このため、使用者がディスクグラインダ１１によって過剰な力でワークＷを切断加工しようとした場合に、切断砥石２４のワークＷに対する押付力Ｆ１を適切に調整することができる。したがって、切断砥石２４や回転モータ１７にかかる負荷を低減することができるので、こうした負荷による切断砥石２４の破損や回転モータ１７の故障を抑制することができる。 (1) When the pressing force F1 detected by the strain gauge 31 exceeds the threshold S, the pressing force control unit 39 controls the driving of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold S. For this reason, when the user tries to cut the work W with an excessive force by the disc grinder 11, the pressing force F1 of the cutting wheel 24 against the work W can be appropriately adjusted. Therefore, since the load applied to the cutting grindstone 24 and the rotary motor 17 can be reduced, it is possible to suppress the breakage of the cutting grindstone 24 and the failure of the rotary motor 17 due to such load.
　（２）ディスクグラインダ１１は、押付力制御部３９による移動モータ３２の駆動の制御に伴い、切断砥石２４のワークＷに対する押し付け方向において切断砥石２４と相対移動して、切断砥石２４とともにワークＷに接触する接触部材２５を備えている。すなわち、押付力Ｆ１が閾値Ｓよりも大きい場合には、回転駆動ユニット１５と共に切断砥石２４が後退するため、接触部材２５が切断砥石２４とともにワークＷに接触する。このため、ディスクグラインダ１１からワークＷに作用する力を、下側水平部２７のワークＷに対する押付力Ｆ２、上側水平部２８のワークＷに対する押付力Ｆ３、及び切断砥石２４のワークＷに対する押付力Ｆ１の３つに分散することができる。したがって、切断砥石２４のワークＷに対する押付力Ｆ１を効果的に低減することができる。 (2) The disc grinder 11 moves relative to the cutting whetstone 24 in the pressing direction of the cutting whetstone 24 against the work W in accordance with the control of the driving of the moving motor 32 by the pressing force control unit 39 and A contact member 25 in contact is provided. That is, when the pressing force F1 is larger than the threshold value S, the cutting whetstone 24 retreats together with the rotary drive unit 15, so the contact member 25 contacts the workpiece W together with the cutting whetstone 24. For this reason, the force exerted on the work W from the disc grinder 11 is the pressing force F2 of the lower horizontal portion 27 against the work W, the pressing force F3 of the upper horizontal portion 28 against the work W, and the pressing force of the cutting wheel 24 against the work W It can be dispersed in three of F1. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be effectively reduced.
　（３）押付力抑制部は、切断砥石２４のワークＷに対する押し付け方向および押し付け方向とは反対方向において、回転駆動ユニット１５を介して切断砥石２４を直線的に前進及び後退可能とする移動機構によって構成されている。このため、切断砥石２４のワークＷに対する押付力Ｆ１が急激に大きくなって閾値Ｓを超えた場合であっても、切断砥石２４を素早く移動させて、切断砥石２４のワークＷに対する押付力Ｆ１を速やかに閾値Ｓ以下にすることができる。 (3) The pressing force suppression unit is a moving mechanism that enables the cutting wheel 24 to linearly advance and retract through the rotary drive unit 15 in the direction opposite to the pressing direction and the pressing direction of the cutting wheel 24 against the work W It is configured. For this reason, even if the pressing force F1 of the cutting wheel 24 against the workpiece W sharply increases and exceeds the threshold value S, the cutting wheel 24 is moved quickly to press the pressing force F1 of the cutting wheel 24 against the workpiece W. The threshold value S can be quickly reduced.
　
（４）歪みゲージ３１は、切断砥石２４と一体的に移動する回転駆動ユニット１５のケース１６に設けられている。このため、歪みゲージ３１により、切断砥石２４のワークＷに対する押付力Ｆ１を精度よく検出することができる。
(4) The strain gauge 31 is provided on the case 16 of the rotary drive unit 15 that moves integrally with the cutting stone 24. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be detected with high accuracy by the strain gauge 31.
　（第２実施形態）
　次に、本発明の第２実施形態のディスクグラインダ１１について図６及び図７に従って説明する。 Second Embodiment
Next, a disc grinder 11 according to a second embodiment of the present invention will be described with reference to FIGS.
　図６に示すように、第２実施形態のディスクグラインダ１１は、下側水平部２７の先端に下側水平部２７のワークＷに対する押付力Ｆ２を検出する下側弾性センサー４５が設けられ、さらに、上側水平部２８の先端に上側水平部２８のワークＷに対する押付力Ｆ３を検出する上側弾性センサー４６が設けられるという点で第１実施形態のディスクグラインダ１１と相違する。このため、第２実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。なお、下側弾性センサー４５及び上側弾性センサー４６は、押付力制御部３９（図１参照）と電気的に接続されている。 As shown in FIG. 6, the disc grinder 11 of the second embodiment is provided with a lower elastic sensor 45 at the tip of the lower horizontal portion 27 for detecting the pressing force F2 of the lower horizontal portion 27 against the work W. The disc grinder 11 is different from the disc grinder 11 of the first embodiment in that an upper elastic sensor 46 for detecting the pressing force F3 of the upper horizontal portion 28 against the work W is provided at the tip of the upper horizontal portion 28. Therefore, in the second embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified. The lower elastic sensor 45 and the upper elastic sensor 46 are electrically connected to the pressing force control unit 39 (see FIG. 1).
　次に、第２実施形態のディスクグラインダ１１の作用について説明する。 Next, the operation of the disk grinder 11 of the second embodiment will be described.
　図６に示すように、使用者がディスクグラインダ１１のハウジング１２の把持部１３を把持した場合、スライドスイッチ４０をオンにすると、回転駆動ユニット１５が初期位置にある状態で回転モータ１７が駆動されて切断砥石２４を回転させる。 As shown in FIG. 6, when the user grips the grip 13 of the housing 12 of the disc grinder 11, when the slide switch 40 is turned on, the rotary motor 17 is driven with the rotary drive unit 15 in the initial position. The cutting stone 24 is rotated.
　使用者が下側水平部２７及び上側水平部２８をワークＷに押し付けると、押付力制御部３９（図１参照）は、下側弾性センサー４５及び上側弾性センサー４６からの信号を受信する。これにより、押付力制御部３９（図１参照）は、下側水平部２７及び上側水平部２８がワークＷに押し付けられたことを認識する。 When the user presses the lower horizontal portion 27 and the upper horizontal portion 28 against the workpiece W, the pressing force control unit 39 (see FIG. 1) receives signals from the lower elastic sensor 45 and the upper elastic sensor 46. Thereby, the pressing force control unit 39 (see FIG. 1) recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are pressed against the work W.
　すると、図７に示すように、押付力制御部３９（図１参照）は、移動モータ３２を駆動して、回転駆動ユニット１５を初期位置から使用位置へ移動させる。切断砥石２４がワークＷに対して押し付けられると、切断砥石２４によってワークＷが切断され始める。 Then, as shown in FIG. 7, the pressing force control unit 39 (see FIG. 1) drives the moving motor 32 to move the rotary drive unit 15 from the initial position to the use position. When the cutting wheel 24 is pressed against the workpiece W, the cutting wheel 24 starts cutting the workpiece W.
　このとき、押付力制御部３９（図１参照）は、切断砥石２４のワークＷに対する押付力Ｆ１が閾値Ｓを超えると、第１実施形態と同様に、押付力Ｆ１が閾値Ｓ以下となるように移動モータ３２の駆動を制御する。これにより、回転駆動ユニット１５が、切断砥石２４のワークＷに対する押し付け方向とは反対方向に後退する。 At this time, when the pressing force F1 against the work W of the cutting stone 24 exceeds the threshold S, the pressing force control unit 39 (see FIG. 1) makes the pressing force F1 equal to or less than the threshold S as in the first embodiment. The drive of the moving motor 32 is controlled. As a result, the rotational drive unit 15 retracts in the direction opposite to the pressing direction of the cutting wheel 24 against the workpiece W.
　すると、ディスクグラインダ１１からワークＷに作用する力が、下側水平部２７のワークＷに対する押付力Ｆ２、上側水平部２８のワークＷに対する押付力Ｆ３、及び切断砥石２４のワークＷに対する押付力Ｆ１の３つに分散される。このため、切断砥石２４のワークＷに対する押付力Ｆ１が低下する。 Then, the force exerted by the disc grinder 11 on the workpiece W is the pressing force F2 of the lower horizontal portion 27 against the workpiece W, the pressing force F3 of the upper horizontal portion 28 against the workpiece W, and the pressing force F1 of the cutting wheel 24 against the workpiece W Distributed in three. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
　押付力制御部３９（図１参照）は、押付力Ｆ１が閾値Ｓ以下になると、移動モータ３２の駆動を制御して回転駆動ユニット１５を切断砥石２４のワークＷに対する押し付け方向に前進させる。このように、押付力制御部３９（図１参照）は、押付力Ｆ１が閾値Ｓを超えた状態が続かないように移動モータ３２の駆動を制御することで、回転駆動ユニット１５を介して切断砥石２４を前進及び後退させる。 When the pressing force F1 becomes equal to or less than the threshold value S, the pressing force control unit 39 (see FIG. 1) controls the drive of the moving motor 32 to advance the rotary drive unit 15 in the pressing direction of the cutting stone 24 against the workpiece W. As described above, the pressing force control unit 39 (see FIG. 1) controls the driving of the moving motor 32 so that the pressing force F1 does not continue to exceed the threshold value S, thereby cutting via the rotary drive unit 15. Move the grinding wheel 24 forward and backward.
　また、使用者が下側水平部２７及び上側水平部２８をワークＷから離すと、押付力制御部３９（図１参照）は、下側弾性センサー４５及び上側弾性センサー４６からの信号を受信しない。これにより、押付力制御部３９（図１参照）は、下側水平部２７及び上側水平部２８がワークＷから離されたことを認識する。すると、押付力制御部３９（図１参照）は、移動モータ３２を駆動して、回転駆動ユニット１５を使用位置から初期位置へ移動させる。 In addition, when the user separates the lower horizontal portion 27 and the upper horizontal portion 28 from the work W, the pressing force control unit 39 (see FIG. 1) does not receive signals from the lower elastic sensor 45 and the upper elastic sensor 46. . Thereby, the pressing force control unit 39 (see FIG. 1) recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are separated from the work W. Then, the pressing force control unit 39 (see FIG. 1) drives the moving motor 32 to move the rotary drive unit 15 from the use position to the initial position.
　以上詳述した第２実施形態のディスクグラインダ１１によれば上記（１）～（４）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the second embodiment described above in detail, in addition to the effects (1) to (4) described above, the following effects are exhibited.
　（５）押付力制御部３９（図１参照）は、下側弾性センサー４５及び上側弾性センサー４６からの信号を受信するかどうかに応じて、使用者によるワークＷの切断加工作業の開始と終了のタイミングを認識することができる。このため、押付力制御部３９（図１参照）は、下側弾性センサー４５及び上側弾性センサー４６からの信号を受信するかどうかに応じて、移動モータ３２の駆動を制御して切断砥石２４を前進及び後退させる。この結果、使用者によるワークＷの切断加工作業を円滑に行うことができ、且つ使用者によるワークＷの切断加工作業を速やかに終えることができる。 (5) The pressing force control unit 39 (see FIG. 1) starts and ends the work of cutting the workpiece W by the user depending on whether the signals from the lower elastic sensor 45 and the upper elastic sensor 46 are received. The timing of can be recognized. Therefore, the pressing force control unit 39 (see FIG. 1) controls the drive of the moving motor 32 depending on whether the signals from the lower elastic sensor 45 and the upper elastic sensor 46 are received, and the cutting wheel 24 is Move forward and backward. As a result, it is possible to smoothly carry out the cutting and processing operation of the work W by the user, and to quickly finish the cutting and processing operation of the work W by the user.
　（第３実施形態）
　次に、本発明の第３実施形態のディスクグラインダ１１について図８及び図９に従って説明する。 Third Embodiment
Next, a disc grinder 11 according to a third embodiment of the present invention will be described with reference to FIGS.
　図８に示すように、第３実施形態のディスクグラインダ１１は、歪みゲージ３１がハウジング１２の上壁内面に取着けられるという点で第２実施形態のディスクグラインダ１１と相違する。このため、第３実施形態では、第２実施形態と異なる点を説明し、第２実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 8, the disc grinder 11 of the third embodiment differs from the disc grinder 11 of the second embodiment in that the strain gauges 31 are attached to the inner surface of the upper wall of the housing 12. Therefore, in the third embodiment, points different from the second embodiment will be described, and the description of the portions common to the second embodiment will be omitted or simplified.
　図９に示すように、第３実施形態のディスクグラインダ１１の作用は、第２実施形態のディスクグラインダ１１の作用と同様となる。但し、下側弾性センサー４５及び上側弾性センサー４６は、押付力検出部として機能させる。歪みゲージ３１による検出値と、下側弾性センサー４５及び上側弾性センサー４６による２つの検出値との差分から、切断砥石２４によるワークＷに対する押付力Ｆ１が取得される。 As shown in FIG. 9, the operation of the disk grinder 11 of the third embodiment is similar to the operation of the disk grinder 11 of the second embodiment. However, the lower elastic sensor 45 and the upper elastic sensor 46 function as a pressing force detector. From the difference between the detection value by the strain gauge 31 and the two detection values by the lower elastic sensor 45 and the upper elastic sensor 46, the pressing force F1 against the workpiece W by the cutting stone 24 is obtained.
　以上詳述した第３実施形態のディスクグラインダ１１によれば上記（１）～（３）及び（５）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the third embodiment described above in detail, in addition to the effects of the above (1) to (3) and (5), the following effects are exhibited.
　（６）歪みゲージ３１をハウジング１２に取着したので、歪みゲージ３１は、ハウジング１２と一体的に構成される。このため、ハウジング１２の小型化、ひいてはディスクグラインダ１１の小型化に寄与できる。 (6) Since the strain gauge 31 is attached to the housing 12, the strain gauge 31 is configured integrally with the housing 12. For this reason, it can contribute to the miniaturization of the housing 12 and the miniaturization of the disc grinder 11.
　（第４実施形態）
　次に、本発明の第４実施形態のディスクグラインダ１１について図１０及び図１１に従って説明する。 Fourth Embodiment
Next, a disk grinder 11 according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG.
　図１０に示すように、第４実施形態のディスクグラインダ１１は、ケース１６を省略するとともに、移動機構が接触部材２５を切断砥石２４のワークＷに対する押し付け方向に前進させるか又は押し付け方向とは反対方向に後退させるという点で第３実施形態のディスクグラインダ１１と相違する。このため、第４実施形態では、第３実施形態と異なる点を説明し、第３実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 10, in the disk grinder 11 of the fourth embodiment, the case 16 is omitted, and the moving mechanism advances the contact member 25 in the pressing direction of the cutting stone 24 against the workpiece W or is opposite to the pressing direction. It differs from the disc grinder 11 of the third embodiment in that it is retracted in the direction. Therefore, in the fourth embodiment, points different from the third embodiment will be described, and the description of the portions common to the third embodiment will be omitted or simplified.
　図１０に示すように、接触部材２５は、ハウジング１２の下面に前後方向に沿ってスライドして移動するように取り付けられている。接触部材２５の垂直部２６の後面における下端部には、後方に向かって真っ直ぐに延びるラック３０が設けられている。ハウジング１２の下面におけるラック３０の側方位置には、移動モータ３２が固定されている。移動モータ３２は、ラック３０に向かって真っ直ぐに延びているモータ出力軸３３を含む。モータ出力軸３３は、ハウジングの幅方向に沿って延びる軸線を中心に回転する。 As shown in FIG. 10, the contact member 25 is attached to the lower surface of the housing 12 so as to slide and move along the front-rear direction. At the lower end portion of the rear surface of the vertical portion 26 of the contact member 25, a rack 30 is provided which extends straight back. A moving motor 32 is fixed to a side position of the rack 30 on the lower surface of the housing 12. The move motor 32 includes a motor output shaft 33 extending straight towards the rack 30. The motor output shaft 33 rotates about an axis extending along the width direction of the housing.
　モータ出力軸３３の先端には、ピニオン３４が設けられている。ピニオン３４は、ラック３０と噛合している。したがって、移動モータ３２の回転駆動力がラック３０に伝達されて、接触部材２５をラック３０とともに前後方向に沿って移動させる。なお、第４実施形態においては、切断砥石２４は前後方向に沿って移動しない。 A pinion 34 is provided at the tip of the motor output shaft 33. The pinion 34 is in mesh with the rack 30. Accordingly, the rotational driving force of the moving motor 32 is transmitted to the rack 30 to move the contact member 25 along the rack 30 along the front-rear direction. In the fourth embodiment, the cutting stone 24 does not move in the front-rear direction.
　次に、第４実施形態のディスクグラインダ１１の作用について説明する。 Next, the operation of the disk grinder 11 of the fourth embodiment will be described.
　図１０に示すように、使用者がディスクグラインダ１１のハウジング１２の把持部１３を把持した場合、スライドスイッチ４０をオンにすると、回転モータ１７が駆動されて切断砥石２４を回転させる。使用者が下側水平部２７及び上側水平部２８をワークＷに押し付けると、押付力制御部３９（図１参照）は、下側弾性センサー４５及び上側弾性センサー４６からの２つの信号を受信する。これにより、押付力制御部３９（図１参照）は、下側水平部２７及び上側水平部２８がワークＷに押し付けられたことを認識する。 As shown in FIG. 10, when the user grips the grip portion 13 of the housing 12 of the disc grinder 11, when the slide switch 40 is turned on, the rotary motor 17 is driven to rotate the cutting stone 24. When the user presses the lower horizontal portion 27 and the upper horizontal portion 28 against the work W, the pressing force control unit 39 (see FIG. 1) receives two signals from the lower elastic sensor 45 and the upper elastic sensor 46. . Thereby, the pressing force control unit 39 (see FIG. 1) recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are pressed against the work W.
　すると、押付力制御部３９（図１参照）は、移動モータ３２を駆動して、図１１に示すように、接触部材２５を後退させる。続いて、切断砥石２４がワークＷに対して押し付けられると、切断砥石２４によってワークＷが切断され始める。押付力制御部３９（図１参照）は、切断砥石２４のワークＷに対する押付力Ｆ１が閾値Ｓを超えると、押付力Ｆ１が閾値Ｓ以下となるように移動モータ３２の駆動を制御して接触部材２５を切断砥石２４のワークＷに対する押し付け方向に前進させる。 Then, the pressing force control unit 39 (see FIG. 1) drives the moving motor 32 to retract the contact member 25 as shown in FIG. Subsequently, when the cutting wheel 24 is pressed against the workpiece W, the cutting wheel 24 starts cutting the workpiece W. The pressing force control unit 39 (see FIG. 1) controls the drive of the moving motor 32 so that the pressing force F1 becomes equal to or less than the threshold S when the pressing force F1 of the cutting wheel 24 against the workpiece W exceeds the threshold S. The member 25 is advanced in the pressing direction of the cutting wheel 24 against the work W.
　これにより、ディスクグラインダ１１からワークＷに作用する力が、下側水平部２７によるワークＷに対する押付力Ｆ２、上側水平部２８によるワークＷに対する押付力Ｆ３、及び切断砥石２４によるワークＷに対する押付力Ｆ１の３つに分散される。このため、切断砥石２４のワークＷに対する押付力Ｆ１が低下する。 Thereby, the force acting on the work W from the disc grinder 11 is the pressing force F2 against the workpiece W by the lower horizontal portion 27, the pressing force F3 against the workpiece W by the upper horizontal portion 28, and the pressing force against the workpiece W by the cutting wheel 24 Distributed in three of F1. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
　押付力制御部３９（図１参照）は、押付力Ｆ１が閾値Ｓ以下になると、移動モータ３２の駆動を制御して接触部材２５を切断砥石２４のワークＷに対する押し付け方向とは反対方向に後退させる。このように、押付力制御部３９（図１参照）は、押付力Ｆ１が閾値Ｓを超えた状態が続かないように移動モータ３２の駆動を制御することで、接触部材２５を前進及び後退させる。 When the pressing force F1 becomes equal to or less than the threshold value S, the pressing force control unit 39 (see FIG. 1) controls the drive of the moving motor 32 to retract the contact member 25 in the direction opposite to the pressing direction of the cutting stone 24 against the work W Let As described above, the pressing force control unit 39 (see FIG. 1) moves the contact member 25 forward and backward by controlling the driving of the moving motor 32 so that the pressing force F1 does not continue to exceed the threshold value S. .
　以上詳述した第４実施形態のディスクグラインダ１１によれば上記（１）～（３）、（５）及び（６）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the fourth embodiment described above in detail, in addition to the effects of the above (1) to (3), (5) and (6), the following effects are exhibited.
　（７）切断砥石２４によるワークＷに対する押付力Ｆ１を抑制するために、回転モータ１７や切断砥石２４を移動させることなく、接触部材２５を移動させている。このため、ハウジング１２を小型化することができ、ひいてはディスクグラインダ１１を小型化することができる。 (7) In order to suppress the pressing force F1 on the workpiece W by the cutting stone 24, the contact member 25 is moved without moving the rotary motor 17 or the cutting stone 24. Therefore, the housing 12 can be miniaturized, and hence the disk grinder 11 can be miniaturized.
　（第５実施形態）
　次に、本発明の第５実施形態のディスクグラインダ１１について図１２及び図１３に従って説明する。 Fifth Embodiment
Next, a disc grinder 11 according to a fifth embodiment of the present invention will be described with reference to FIGS.
　図１２に示すように、第５実施形態のディスクグラインダ１１は、移動機構がハウジング１２に備えられたままで、回転駆動ユニット１５がハウジング１２外に配置されるという点で第３実施形態のディスクグラインダ１１と相違する。このため、第５実施形態では、第３実施形態と異なる点を説明し、第３実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 12, the disc grinder 11 of the fifth embodiment is the disc grinder of the third embodiment in that the rotary drive unit 15 is disposed outside the housing 12 while the moving mechanism is provided in the housing 12. It is different from 11. Therefore, in the fifth embodiment, points different from the third embodiment will be described, and the description of the portions common to the third embodiment will be omitted or simplified.
　図１３に示すように、第５実施形態のディスクグラインダ１１の作用は、第３実施形態のディスクグラインダ１１の作用と同様である。 As shown in FIG. 13, the operation of the disk grinder 11 of the fifth embodiment is the same as the operation of the disk grinder 11 of the third embodiment.
　以上詳述した第５実施形態のディスクグラインダ１１によれば上記（１）～（３）、（５）及び（６）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the fifth embodiment described in detail above, in addition to the effects of the above (1) to (3), (5) and (6), the following effects are exhibited.
　（８）ハウジング１２には、ワークＷの切断加工において切断砥石２４をワークＷに対して押し付ける際の押付力Ｆ１を抑制するための押付力抑制部を構成する移動機構（ラック３０、移動モータ３２、モータ出力軸３３、及びピニオン３４）が備えられている。このため、移動機構は、ハウジング１２と一体的に構成されるので、ディスクグラインダ１１の小型化に寄与できる。 (8) A movement mechanism (rack 30, movement motor 32) constituting a pressing force suppression portion for suppressing the pressing force F1 when pressing the cutting stone 24 against the workpiece W in the cutting process of the workpiece W in the housing 12 , Motor output shaft 33 and pinion 34). For this reason, the moving mechanism is integrally formed with the housing 12, which can contribute to the miniaturization of the disc grinder 11.
　（第６実施形態）
　次に、本発明の第６実施形態のディスクグラインダ１１について図１４～図１６に従って説明する。 Sixth Embodiment
Next, a disk grinder 11 according to a sixth embodiment of the present invention will be described with reference to FIGS.
　図１４に示すように、第６実施形態のディスクグラインダ１１は、接触部材２５と、接触部材２５を移動させる移動機構とが一体的に構成されるとともに、ハウジング１２に対して着脱可能に取着けられるという点で第１実施形態のディスクグラインダ１１と相違する。このため、第６実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 14, the disc grinder 11 according to the sixth embodiment includes a contact member 25 and a moving mechanism for moving the contact member 25 integrally, and is detachably attached to the housing 12. And the disk grinder 11 of the first embodiment. Therefore, in the sixth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　図１４に示すように、接触部材２５の垂直部２６の後面における下端部には、後方に向かって真っ直ぐに延びるラック３０が設けられている。ラック３０は、フレーム４７によって前後方向に沿って移動可能に支持されている。フレーム４７におけるラック３０の側方位置には、移動モータ３２が固定されている。移動モータ３２は、ラック３０に向かって真っ直ぐに延びているモータ出力軸３３を含む。モータ出力軸３３は、フレーム４７の幅方向に沿って延びる軸線を中心に回転する。 As shown in FIG. 14, at the lower end portion of the rear surface of the vertical portion 26 of the contact member 25, a rack 30 extending straight back is provided. The rack 30 is movably supported by the frame 47 along the front-rear direction. A moving motor 32 is fixed at a side position of the rack 30 in the frame 47. The move motor 32 includes a motor output shaft 33 extending straight towards the rack 30. The motor output shaft 33 rotates about an axis extending along the width direction of the frame 47.
　モータ出力軸３３の先端には、ピニオン３４が設けられている。ピニオン３４は、ラック３０と噛合している。したがって、接触部材２５、ラック３０、及び移動モータ３２は、フレーム４７によって一体的に構成されている。また、フレーム４７における後端上部には、ハウジング１２の下面に設けられたフック部４８に着脱自在に取り付けられる取着部４９が設けられている。 A pinion 34 is provided at the tip of the motor output shaft 33. The pinion 34 is in mesh with the rack 30. Therefore, the contact member 25, the rack 30, and the moving motor 32 are integrally configured by the frame 47. Further, at the upper end of the rear end of the frame 47, an attaching portion 49 detachably attached to a hook portion 48 provided on the lower surface of the housing 12 is provided.
　ハウジング１２の下面における開口部１４とフック部４８との間には、フレーム４７の取着部４９をフック部４８に取り付けた際に移動モータ３２と電気的に接続される接続端子５０が設けられている。接続端子５０は、押付力制御部３９（図１参照）と電気的に接続されている。 Between the opening 14 and the hook portion 48 on the lower surface of the housing 12, a connection terminal 50 electrically connected to the moving motor 32 when the attachment portion 49 of the frame 47 is attached to the hook portion 48 is provided. ing. The connection terminal 50 is electrically connected to the pressing force control unit 39 (see FIG. 1).
　したがって、図１５に示すように、フレーム４７の取着部４９をフック部４８に取り付けた状態で移動モータ３２の回転駆動力がラック３０に伝達されて、接触部材２５をラック３０とともに前後方向に沿って移動させる。なお、第６実施形態においては、切断砥石２４は前後方向に沿って移動しない。 Therefore, as shown in FIG. 15, with the attachment portion 49 of the frame 47 attached to the hook portion 48, the rotational driving force of the moving motor 32 is transmitted to the rack 30, and the contact member 25 with the rack 30 in the front-rear direction Move along. In the sixth embodiment, the cutting stone 24 does not move in the front-rear direction.
　第６実施形態のディスクグラインダ１１の作用は、図１６に示すように、第４実施形態のディスクグラインダ１１の作用と同様となる。 The operation of the disk grinder 11 of the sixth embodiment is similar to the operation of the disk grinder 11 of the fourth embodiment, as shown in FIG.
　以上詳述した第６実施形態によれば上記（１）～（４）及び（７）の効果に加え、次のような効果が発揮される。 According to the sixth embodiment described above, in addition to the effects of the above (1) to (4) and (7), the following effects are exhibited.
　（９）接触部材２５がハウジング１２に対して着脱可能であるため、使用者の切断砥石２４のワークＷに対する押付力Ｆ１の調整能力やワークＷ周辺の状況に応じて、使用者自身が接触部材２５を使用するか否かを選択することができる。 (9) Since the contact member 25 is attachable to and detachable from the housing 12, the user himself can contact the member according to the adjustment ability of the pressing force F1 against the workpiece W by the user of the cutting wheel 24 and the situation around the workpiece W. It is possible to select whether to use 25 or not.
　（第７実施形態）
　次に、本発明の第７実施形態のディスクグラインダ１１について図１７及び図１８に従って説明する。 Seventh Embodiment
Next, a disk grinder 11 according to a seventh embodiment of the present invention will be described with reference to FIGS.
　図１７に示すように、第７実施形態のディスクグラインダ１１は、スライドスイッチ４０をオンする前から切断砥石２４の前端部が接触部材２５よりも前方に突出するという点で第１実施形態と相違する。このため、第７実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 17, the disc grinder 11 of the seventh embodiment is different from the first embodiment in that the front end portion of the cutting grindstone 24 projects further forward than the contact member 25 before the slide switch 40 is turned on. Do. Therefore, in the seventh embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　図１８に示すように、第７実施形態のディスクグラインダ１１の作用は、スライドスイッチ４０をオンする前から切断砥石２４の前端部が接触部材２５よりも前方に突出していること以外、第１実施形態のディスクグラインダ１１の作用と同様である。 As shown in FIG. 18, the operation of the disc grinder 11 according to the seventh embodiment is the first embodiment except that the front end of the cutting stone 24 protrudes forward relative to the contact member 25 before the slide switch 40 is turned on. It is similar to the operation of the disk grinder 11 of the embodiment.
　
以上詳述した第７実施形態によれば上記（１）～（４）の効果に加え、次のような効果が発揮される。
According to the seventh embodiment described above, the following effects are exhibited in addition to the effects (1) to (4).
　（１０）初期位置において切断砥石２４の前端部が接触部材２５よりも前方に突出しているため、使用者がスライドスイッチ４０をオンした後、速やかにワークＷの切断加工を行うことができる。 (10) Since the front end portion of the cutting stone 24 protrudes forward relative to the contact member 25 at the initial position, the user can cut the work W promptly after the slide switch 40 is turned on.
　（第８実施形態）
　次に、本発明の第８実施形態のディスクグラインダ１１について図１９及び図２０に従って説明する。 Eighth Embodiment
Next, a disk grinder 11 according to an eighth embodiment of the present invention will be described with reference to FIGS.
　図１９に示すように、第８実施形態のディスクグラインダ１１は、移動機構（押付力抑制部）の代わりに空気圧によって回転駆動ユニット１５を前後方向に沿って移動させる空気圧アクチュエータ５５を備えるという点で第１実施形態のディスクグラインダ１１と相違する。このため、第８実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 19, the disc grinder 11 of the eighth embodiment is provided with an air pressure actuator 55 for moving the rotary drive unit 15 along the front-rear direction by air pressure instead of the moving mechanism (pressing force suppressing portion). This is different from the disk grinder 11 of the first embodiment. Therefore, in the eighth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　図１９に示すように、空気圧アクチュエータ５５は、ハウジング１２内に固定されて配置されている。空気圧アクチュエータ５５は、空気圧によって伸縮するロッド５６を備えている。ロッド５６の先端は、回転駆動ユニット１５のケース１６の後面中央部に接続されている。したがって、回転駆動ユニット１５は、空気圧アクチュエータ５５の駆動に伴うロッド５６の伸縮運動により、初期位置と使用位置との間で直線的に移動する。 As shown in FIG. 19, the pneumatic actuator 55 is fixedly disposed in the housing 12. The pneumatic actuator 55 is provided with a rod 56 which is expanded and contracted by air pressure. The tip of the rod 56 is connected to the center of the rear surface of the case 16 of the rotary drive unit 15. Therefore, the rotary drive unit 15 linearly moves between the initial position and the use position by the telescopic movement of the rod 56 accompanying the drive of the pneumatic actuator 55.
　空気圧アクチュエータ５５は、押付力制御部３９（図１参照）と電気的に接続されている。空気圧アクチュエータ５５は、押付力制御部３９（図１参照）によって制御される。 The pneumatic actuator 55 is electrically connected to the pressing force control unit 39 (see FIG. 1). The pneumatic actuator 55 is controlled by the pressing force control unit 39 (see FIG. 1).
　第８実施形態のディスクグラインダ１１の作用は、図２０に示すように、空気圧アクチュエータ５５の駆動によって回転駆動ユニット１５を介して切断砥石２４を直線的に前進及び後退させること以外、第１実施形態のディスクグラインダ１１の作用と同様である。 The operation of the disc grinder 11 according to the eighth embodiment is the first embodiment except that the cutting wheel 24 is linearly advanced and retracted via the rotary drive unit 15 by driving the pneumatic actuator 55 as shown in FIG. It is similar to the action of the disc grinder 11 of
　以上詳述した第８実施形態のディスクグラインダ１１によれば上記（１）～（４）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the eighth embodiment described in detail above, the following effects are exhibited in addition to the effects (1) to (4).
　（１１）空気圧アクチュエータ５５の駆動によって回転駆動ユニット１５を介して切断砥石２４を直線的に移動させている。このため、使用者が切断砥石２４のワークＷに対する押付力Ｆ１を急激に大きくした場合でも、切断砥石２４や回転モータ１７にかかる負荷を柔軟に緩和することができる。 (11) The cutting stone 24 is moved linearly via the rotary drive unit 15 by the drive of the pneumatic actuator 55. Therefore, even when the user sharply increases the pressing force F1 of the cutting wheel 24 against the workpiece W, the load on the cutting wheel 24 and the rotary motor 17 can be flexibly alleviated.
　（第９実施形態）
　次に、本発明の第９実施形態のディスクグラインダ１１について図２１～図２３に従って説明する。 The ninth embodiment
Next, a disk grinder 11 according to a ninth embodiment of the present invention will be described with reference to FIGS. 21 to 23.
　図２１に示すように、第９実施形態のディスクグラインダ１１は、空気圧アクチュエータ５５の代わりに、押付力抑制部として機能するＥＲゲル（Electro Rheological Gel）を備え、且つ接触部材２５を省略したという点で第８実施形態のディスクグラインダ１１と相違する。このため、第９実施形態では、第８実施形態と異なる点を説明し、第８実施形態との共通部分については説明を省略又は簡略する。なお、ＥＲゲルの粘着性は、印加電圧に応じて変化する。 As shown in FIG. 21, the disc grinder 11 of the ninth embodiment is provided with an ER gel (Electro Rheological Gel) functioning as a pressing force suppressing portion instead of the pneumatic actuator 55, and the contact member 25 is omitted. And the disk grinder 11 of the eighth embodiment. Therefore, in the ninth embodiment, points different from the eighth embodiment will be described, and the description of the portions common to the eighth embodiment will be omitted or simplified. In addition, the adhesiveness of ER gel changes according to an applied voltage.
　図２１及び図２２（ａ）、（ｂ）に示すように、ハウジング１２内における回転駆動ユニット１５のケース１６の後面と対向する位置には、前後方向において開口するように円筒状の支持部材５１が固定されて配置されている。支持部材５１は、円筒状の支持部材本体５１aと、支持部材本体５１aの内周面に形成された円筒状の固定電極部５２と、固定電極部５２の内周面に形成された円筒状のＥＲゲル５３とを含む。 As shown in FIGS. 21 and 22 (a) and 22 (b), a cylindrical support member 51 is opened in the longitudinal direction at a position facing the rear surface of the case 16 of the rotary drive unit 15 in the housing 12. Is fixed and arranged. The support member 51 includes a cylindrical support member main body 51a, a cylindrical fixed electrode portion 52 formed on the inner peripheral surface of the support member main body 51a, and a cylindrical shape formed on the inner peripheral surface of the fixed electrode portion 52. And ER gel 53.
　回転駆動ユニット１５のケース１６の後面中央部には、丸棒状のシャフト５４の前端が固着されている。シャフト５４の後端部には、円筒状の可動電極部５７が固着されている。すなわち、可動電極部５７は、シャフト５４の後端部が可動電極部５７に挿嵌された状態でシャフト５４に固定されている。 The front end of a round rod-like shaft 54 is fixed to the central portion of the rear surface of the case 16 of the rotary drive unit 15. A cylindrical movable electrode portion 57 is fixed to the rear end portion of the shaft 54. That is, the movable electrode portion 57 is fixed to the shaft 54 in a state in which the rear end portion of the shaft 54 is inserted into the movable electrode portion 57.
　図２２（ｂ）に示すように、シャフト５４の後端部は、ＥＲゲル５３の内側に挿通されている。この場合、可動電極部５７の外周面は、ＥＲゲル５３の内周面に摺接している。固定電極部５２及び可動電極部５７は、押付力制御部３９（図１参照）と電気的に接続されている。 As shown in FIG. 22 (b), the rear end of the shaft 54 is inserted into the inside of the ER gel 53. In this case, the outer peripheral surface of the movable electrode portion 57 is in sliding contact with the inner peripheral surface of the ER gel 53. The fixed electrode unit 52 and the movable electrode unit 57 are electrically connected to the pressing force control unit 39 (see FIG. 1).
　押付力制御部３９（図１参照）は、固定電極部５２と可動電極部５７との間に電圧を印加する。すなわち、押付力制御部３９（図１参照）は、固定電極部５２と可動電極部５７との間に印加する電圧を制御することで、ＥＲゲル５３の粘着性を調整する。 The pressing force control unit 39 (see FIG. 1) applies a voltage between the fixed electrode unit 52 and the movable electrode unit 57. That is, the pressing force control unit 39 (see FIG. 1) adjusts the adhesiveness of the ER gel 53 by controlling the voltage applied between the fixed electrode unit 52 and the movable electrode unit 57.
　なお、本実施形態では、固定電極部５２、可動電極部５７、及びＥＲゲル５３によって押付力抑制部が構成されている。 In the present embodiment, the fixed electrode portion 52, the movable electrode portion 57, and the ER gel 53 constitute a pressing force suppression portion.
　次に、第９実施形態のディスクグラインダ１１の作用について説明する。 Next, the operation of the disk grinder 11 of the ninth embodiment will be described.
　図２１に示すように、使用者がディスクグラインダ１１のハウジング１２の把持部１３を把持した場合、スライドスイッチ４０をオンすると、回転モータ１７が駆動されて切断砥石２４を回転させる。このとき、ＥＲゲル５３の粘着性は、印加電圧によって高まっているので、ＥＲゲル５３と可動電極部５７との摩擦力は大きくなっている。 As shown in FIG. 21, when the user grips the grip portion 13 of the housing 12 of the disc grinder 11, when the slide switch 40 is turned on, the rotary motor 17 is driven to rotate the cutting stone 24. At this time, since the adhesiveness of the ER gel 53 is increased by the applied voltage, the frictional force between the ER gel 53 and the movable electrode portion 57 is increased.
　続いて、図２１に示すように、切断砥石２４がワークＷに対して押し付けられると、切断砥石２４によってワークＷが切断され始める。このとき、ＥＲゲル５３と可動電極部５７との摩擦力は大きいため、可動電極部５７はＥＲゲル５３上を摺動しない。すなわち、シャフト５４は、押付力Ｆ１の反力によって後退しない。 Subsequently, as shown in FIG. 21, when the cutting wheel 24 is pressed against the workpiece W, the cutting wheel 24 starts cutting the workpiece W. At this time, since the frictional force between the ER gel 53 and the movable electrode portion 57 is large, the movable electrode portion 57 does not slide on the ER gel 53. That is, the shaft 54 does not move backward due to the reaction force of the pressing force F1.
　図２３に示すように、押付力制御部３９（図１参照）は、切断砥石２４のワークＷに対する押付力Ｆ１が閾値Ｓを超えると、押付力Ｆ１が閾値Ｓ以下となるようにＥＲゲル５３に印加する電圧を低下させる。 As shown in FIG. 23, when the pressing force F1 of the cutting wheel 24 against the workpiece W exceeds the threshold value S, the pressing force control unit 39 (see FIG. 1) sets the ER gel 53 such that the pressing force F1 becomes equal to or less than the threshold value S. Reduce the voltage applied to the
　すると、ＥＲゲル５３の粘着性が低下するため、ＥＲゲル５３と可動電極部５７との摩擦力が小さくなる。このため、シャフト５４は、押付力Ｆ１の反力によって可動電極部５７を介してＥＲゲル５３上を摺動する。すなわち、シャフト５４は、押付力Ｆ１の反力によって後退するので、回転駆動ユニット１５が後退する。これにより、切断砥石２４のワークＷに対する押付力Ｆ１が抑制される。 Then, the adhesion of the ER gel 53 is reduced, so the frictional force between the ER gel 53 and the movable electrode portion 57 is reduced. Thus, the shaft 54 slides on the ER gel 53 via the movable electrode portion 57 by the reaction force of the pressing force F1. That is, since the shaft 54 is retracted by the reaction force of the pressing force F1, the rotary drive unit 15 is retracted. Thereby, the pressing force F1 with respect to the workpiece | work W of the cutting grindstone 24 is suppressed.
　以上詳述した第９実施形態のディスクグラインダ１１によれば上記（１）～（４）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the ninth embodiment described in detail above, the following effects are exhibited in addition to the effects (1) to (4).
　（１２）押付力Ｆ１が閾値Ｓ以下となるようにＥＲゲル５３に印加する電圧を制御してシャフト５４（回転駆動ユニット１５）の後退を許容している。このため、使用者が切断砥石２４のワークＷに対する押付力Ｆ１を急激に大きくした場合でも、切断砥石２４や回転モータ１７にかかる負荷を柔軟に緩和することができる。 (12) The voltage applied to the ER gel 53 is controlled such that the pressing force F1 is equal to or less than the threshold value S, thereby allowing the shaft 54 (rotational drive unit 15) to retreat. Therefore, even when the user sharply increases the pressing force F1 of the cutting wheel 24 against the workpiece W, the load on the cutting wheel 24 and the rotary motor 17 can be flexibly alleviated.
　（第１０実施形態）
　次に、本発明の第１０実施形態のディスクグラインダ１１について図２４に従って説明する。 Tenth Embodiment
Next, a disk grinder 11 according to a tenth embodiment of the present invention will be described with reference to FIG.
　図２４に示すように、第１０実施形態のディスクグラインダ１１は、歪みゲージ３１をモータ出力軸１８に円筒状のベアリング５９を介して取着したという点で第１実施形態のディスクグラインダ１１と相違する。このため、第１０実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 24, the disc grinder 11 of the tenth embodiment is different from the disc grinder 11 of the first embodiment in that the strain gauge 31 is attached to the motor output shaft 18 via a cylindrical bearing 59. Do. Therefore, in the tenth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　
第１０実施形態のディスクグラインダ１１の作用は、第１実施形態のディスクグラインダ１１の作用と同様となる。
The operation of the disk grinder 11 of the tenth embodiment is similar to the operation of the disk grinder 11 of the first embodiment.
　以上詳述した第１０実施形態のディスクグラインダ１１によれば上記（１）～（３）の効果に加え、次のような効果が発揮される。 According to the disk grinder 11 of the tenth embodiment described above, the following effects are exhibited in addition to the effects (1) to (3).
　（１３）モータ出力軸１８に円筒状のベアリング５９を介して歪みゲージ３１が取着されている。このため、切断砥石２４から歪みゲージ３１までの力の伝達距離が短くなるとともに、切断砥石２４のワークＷに対する押し付け方向と同一方向の力を検出することができる。したがって、切断砥石２４のワークＷに対する押付力Ｆ１を精度よく検出することができる。 (13) The strain gauge 31 is attached to the motor output shaft 18 via the cylindrical bearing 59. For this reason, while the transmission distance of the force from the cutting grindstone 24 to the strain gauge 31 becomes short, the force of the same direction as the pressing direction with respect to the workpiece W of the cutting grindstone 24 can be detected. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be detected with high accuracy.
　（第１１実施形態）
　次に、本発明の第１１実施形態のディスクグラインダ１１について図２５及び図２６に従って説明する。 Eleventh Embodiment
Next, a disk grinder 11 according to an eleventh embodiment of the present invention will be described with reference to FIGS.
　図２５に示すように、第１１実施形態のディスクグラインダ１１は、回転モータ１７、モータ出力軸１８、及び冷却ファン２０がケース１６に覆われることなく、第１傘歯車１９及び第２傘歯車２３がケース１６で覆われるという点で第１実施形態のディスクグラインダ１１と相違する。このため、第１１実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 25, in the disk grinder 11 of the eleventh embodiment, the first bevel gear 19 and the second bevel gear 23 are not covered by the case 16 with the rotary motor 17, the motor output shaft 18, and the cooling fan 20. Is different from the disc grinder 11 of the first embodiment in that the case is covered with the case 16. Therefore, in the eleventh embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　図２５に示すように、第１傘歯車１９には、前後方向に沿って延びる円筒状の連結軸６０が設けられている。連結軸６０は、ケース１６の後壁に形成された貫通孔６１に挿嵌されている。連結軸６０内には、回転モータ１７の前面から延びるモータ出力軸１８が軸方向（前後方向）に沿って摺動可能に挿入されている。 As shown in FIG. 25, the first bevel gear 19 is provided with a cylindrical connecting shaft 60 extending along the front-rear direction. The connecting shaft 60 is inserted into a through hole 61 formed in the rear wall of the case 16. In the connecting shaft 60, a motor output shaft 18 extending from the front surface of the rotary motor 17 is slidably inserted along the axial direction (longitudinal direction).
　この場合、モータ出力軸１８の外周面にはオス型のスプラインが形成され、連結軸６０の内周面にはメス型のスプラインが形成されている。すなわち、モータ出力軸１８と連結軸６０とは、いわゆるスプライン結合されている。したがって、回転モータ１７の回転駆動力はモータ出力軸１８を介して連結軸６０に伝達される。 In this case, a male spline is formed on the outer peripheral surface of the motor output shaft 18, and a female spline is formed on the inner peripheral surface of the connecting shaft 60. That is, the motor output shaft 18 and the connecting shaft 60 are so-called splined. Therefore, the rotational drive force of the rotary motor 17 is transmitted to the connecting shaft 60 via the motor output shaft 18.
　ケース１６の後面中央部よりもやや下側寄りの位置には、後方に向かって真っ直ぐに延びるラック３０が設けられている。ケース１６の後面におけるラック３０と隣り合う位置には、歪みゲージ３１が取着されている。ハウジング１２の下壁内面におけるラック３０の側方位置には、移動モータ３２が固定されて配置されている。移動モータ３２は、ラック３０に向かって真っ直ぐに延びているモータ出力軸３３を含む。モータ出力軸３３は、左右方向に沿って延びる軸線を中心に回転する。 At a position slightly below the center of the rear face of the case 16, a rack 30 extending straight back is provided. A strain gauge 31 is attached at a position adjacent to the rack 30 on the rear surface of the case 16. A moving motor 32 is fixedly disposed at a side position of the rack 30 on the inner surface of the lower wall of the housing 12. The move motor 32 includes a motor output shaft 33 extending straight towards the rack 30. The motor output shaft 33 rotates about an axis extending along the left-right direction.
　モータ出力軸３３の先端には、ピニオン３４が設けられている。ピニオン３４は、ラック３０と噛合している。したがって、移動モータ３２の回転駆動力がラック３０に伝達されて、ケース１６をラック３０とともに前後方向に沿って移動させる。すなわち、移動モータ３２の駆動に伴うケース１６の前後方向における移動により、切断砥石２４が回転出力軸２２とともに前後方向に沿って移動する。 A pinion 34 is provided at the tip of the motor output shaft 33. The pinion 34 is in mesh with the rack 30. Therefore, the rotational driving force of the moving motor 32 is transmitted to the rack 30, and the case 16 is moved along with the rack 30 in the front-rear direction. That is, by the movement of the case 16 in the front-rear direction accompanying the drive of the moving motor 32, the cutting grindstone 24 moves along the front-rear direction together with the rotation output shaft 22.
　図２６に示すように、第１１実施形態のディスクグラインダ１１の作用は、ケース１６の前後方向における移動に伴って回転モータ１７、モータ出力軸１８、及び冷却ファン２０が前後方向に沿って移動しないこと以外、第１実施形態のディスクグラインダ１１の作用と同様である。 As shown in FIG. 26, the operation of the disc grinder 11 according to the eleventh embodiment is that the rotary motor 17, the motor output shaft 18, and the cooling fan 20 do not move along the front-rear direction as the case 16 moves in the front-rear direction. Other than that, the operation is the same as the operation of the disk grinder 11 of the first embodiment.
　以上詳述した第１１実施形態によれば上記（１）～（４）の効果に加え、次のような効果が発揮される。 According to the eleventh embodiment described above, in addition to the effects of the above (1) to (4), the following effects are exhibited.
　（１４）切断砥石２４と一体で移動するケース１６内に回転モータ１７、モータ出力軸１８、及び冷却ファン２０が収容されないので、ケース１６を小さくすることができる。したがって、ハウジング１２内におけるケース１６の移動スペースも低減できるので、ハウジング１２を小さくすることができ、ひいてはディスクグラインダ１１を小さくすることができる。 (14) Since the rotary motor 17, the motor output shaft 18, and the cooling fan 20 are not accommodated in the case 16 moving integrally with the cutting stone 24, the case 16 can be made smaller. Therefore, the moving space of the case 16 in the housing 12 can also be reduced, so that the housing 12 can be made smaller, and hence the disc grinder 11 can be made smaller.
　（１５）移動モータ３２がハウジング１２の内面に固定されているので、移動モータ３２の配線が屈曲して断線するなどの故障の発生を抑制できる。 (15) Since the moving motor 32 is fixed to the inner surface of the housing 12, it is possible to suppress the occurrence of a failure such as the wiring of the moving motor 32 being bent and broken.
　（第１２実施形態）
　次に、本発明の第１２実施形態のディスクグラインダ１１について図２７に従って説明する。 (Twelfth embodiment)
Next, a disc grinder 11 according to a twelfth embodiment of the present invention will be described with reference to FIG.
　図２７に示すように、第１２実施形態のディスクグラインダ１１は、歪みゲージ３１を回転出力軸２２に円筒状のベアリング６２を介して取着したという点で第１実施形態のディスクグラインダ１１と相違する。このため、第１２実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIG. 27, the disc grinder 11 of the twelfth embodiment differs from the disc grinder 11 of the first embodiment in that the strain gauge 31 is attached to the rotary output shaft 22 via the cylindrical bearing 62. Do. Therefore, in the twelfth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　第１２実施形態のディスクグラインダ１１の作用は、第１実施形態のディスクグラインダ１１の作用と同様となる。 The operation of the disk grinder 11 of the twelfth embodiment is similar to the operation of the disk grinder 11 of the first embodiment.
　以上詳述した第１２実施形態によれば上記（１）～（３）の効果に加え、次のような効果が発揮される。 According to the twelfth embodiment described above, in addition to the effects of the above (1) to (3), the following effects are exhibited.
　（１６）回転出力軸２２には、円筒状のベアリング６２を介して歪みゲージ３１が取着されている。このため、切断砥石２４から歪みゲージ３１までの力の伝達距離を短くすることができ、且つ切断砥石２４のワークＷに対する押し付け方向と同一方向における力を検出することができる。したがって、切断砥石２４のワークＷに対する押付力Ｆ１を精度よく検出することができる。 (16) The strain gauge 31 is attached to the rotary output shaft 22 via the cylindrical bearing 62. Therefore, the transmission distance of the force from the cutting wheel 24 to the strain gauge 31 can be shortened, and the force in the same direction as the pressing direction of the cutting wheel 24 against the workpiece W can be detected. Therefore, the pressing force F1 of the cutting wheel 24 against the workpiece W can be detected with high accuracy.
　（第１３実施形態）
　次に、本発明の第１３実施形態のディスクグラインダ１１について図２８及び図２９に従って説明する。 (13th Embodiment)
Next, a disk grinder 11 according to a thirteenth embodiment of the present invention will be described with reference to FIGS. 28 and 29.
　図２８（ａ）～（ｃ）に示すように、第１３実施形態のディスクグラインダ１１は、押付力Ｆ１を低減するべく、切断砥石２４を前後方向だけでなく左右方向にも移動可能としたという点で第１実施形態のディスクグラインダ１１と相違する。このため、第１３実施形態では、第１実施形態と異なる点を説明し、第１実施形態との共通部分については説明を省略又は簡略する。 As shown in FIGS. 28 (a) to 28 (c), the disk grinder 11 of the thirteenth embodiment is capable of moving the cutting stone 24 not only in the front-rear direction but also in the left-right direction in order to reduce the pressing force F1. This differs from the disk grinder 11 of the first embodiment in terms of points. Therefore, in the thirteenth embodiment, points different from the first embodiment will be described, and the description of the portions common to the first embodiment will be omitted or simplified.
　図２８（ａ）に示すように、モータ出力軸１８の中央部には、等速ジョイント７０が設けられている。第１傘歯車１９には、前後方向に沿って延びる円筒状の連結軸７１が設けられている。連結軸７１における中央部よりもやや前寄りの位置には、等速ジョイント７２が設けられている。連結軸７１内には、後側からモータ出力軸１８の先端部が軸方向（前後方向）に沿って摺動可能に挿入されている。 As shown in FIG. 28A, a constant velocity joint 70 is provided at the center of the motor output shaft 18. The first bevel gear 19 is provided with a cylindrical connecting shaft 71 extending in the front-rear direction. A constant velocity joint 72 is provided at a position slightly forward of the central portion of the connecting shaft 71. In the connecting shaft 71, the front end portion of the motor output shaft 18 is slidably inserted along the axial direction (front-rear direction) from the rear side.
　この場合、モータ出力軸１８の外周面にはオス型のスプラインが形成され、連結軸７１の内周面にはメス型のスプラインが形成されている。すなわち、モータ出力軸１８と連結軸７１とは、いわゆるスプライン結合されている。したがって、回転モータ１７の回転力はモータ出力軸１８を介して連結軸７１に伝達される。 In this case, a male spline is formed on the outer peripheral surface of the motor output shaft 18, and a female spline is formed on the inner peripheral surface of the connecting shaft 71. That is, the motor output shaft 18 and the connecting shaft 71 are so-called spline connected. Therefore, the rotational force of the rotary motor 17 is transmitted to the connecting shaft 71 via the motor output shaft 18.
　図２８（ｂ）及び図２８（ｃ）に示すように、回転出力軸２２の中央部には、回転出力軸２２とともに切断砥石２４を水平面における複数の方向に沿って前進及び後退可能な移動機構（押付力抑制部）の一例として機能する移動ユニット７３が設けられている。移動ユニット７３は、水平に配置された矩形板状のベース部材７４を備えている。ベース部材７４の後端縁における左側半分には、左右方向に沿って延びる第１ラック７５が設けられている。 As shown in FIGS. 28 (b) and 28 (c), at the central portion of the rotation output shaft 22, a moving mechanism capable of advancing and retracting the cutting wheel 24 along a plurality of directions in the horizontal plane together with the rotation output shaft 22. A moving unit 73 is provided which functions as an example of the (pressing force suppressing portion). The moving unit 73 includes a rectangular plate-shaped base member 74 disposed horizontally. The left half of the rear end of the base member 74 is provided with a first rack 75 extending in the left-right direction.
　第１ラック７５には、ハウジング１２に固定された第１モータ７６から延びる出力軸７７の先端に設けられたピニオン７８が噛合している。したがって、第１モータ７６の駆動により、ベース部材７４が左右方向に沿って移動する。ベース部材７４の右端部には、前後方向に沿って延びる長孔であるガイド孔７９が貫通形成されている。ガイド孔７９には、回転出力軸２２が摺動可能に挿通されている。 A pinion 78 provided at the tip of an output shaft 77 extending from a first motor 76 fixed to the housing 12 is in mesh with the first rack 75. Therefore, the base member 74 moves in the left-right direction by the drive of the first motor 76. At the right end of the base member 74, a guide hole 79, which is a long hole extending along the front-rear direction, is formed through. The rotation output shaft 22 is slidably inserted into the guide hole 79.
　この場合、ガイド孔７９は、回転出力軸２２の前後方向への移動（摺動）を許容し、回転出力軸２２の左右方向への移動を規制する。ベース部材７４上におけるガイド孔７９と対応する位置には、ガイド孔７９よりも若干幅広の矩形板状に形成されたスライド部材８０が配置されている。スライド部材８０は、回転出力軸２２に貫挿された状態で回転出力軸２２に固定されている。 In this case, the guide holes 79 allow movement (sliding) of the rotational output shaft 22 in the front-rear direction, and restricts the movement of the rotational output shaft 22 in the lateral direction. At a position corresponding to the guide hole 79 on the base member 74, a slide member 80 formed in a rectangular plate shape slightly wider than the guide hole 79 is disposed. The slide member 80 is fixed to the rotation output shaft 22 in a state of being inserted into the rotation output shaft 22.
　スライド部材８０の左端縁には、前後方向に沿って延びる第２ラック８１が設けられている。第２ラック８１には、ベース部材７４上に固定された第２モータ８２から延びる出力軸８３の先端に設けられたウォーム８４が噛合している。したがって、第２モータ８２の駆動により、スライド部材８０が前後方向に沿って移動する。 At the left end edge of the slide member 80, a second rack 81 extending in the front-rear direction is provided. A worm 84 provided at the tip of an output shaft 83 extending from the second motor 82 fixed on the base member 74 meshes with the second rack 81. Therefore, the slide member 80 moves in the front-rear direction by the drive of the second motor 82.
　図２８（ｃ）に示すように、第１３実施形態では、ハウジング１２に固定された接触部材２５の下側水平部２７及び上側水平部２８が円環板状に形成されている。この場合、下側水平部２７及び上側水平部２８の外径は、切断砥石２４の外径よりも若干大きくなるように設定されている。下側水平部２７及び上側水平部２８の周面全体には、ワークＷとの接触位置を検出可能な弾性センサー（図示略）が設けられている。この弾性センサー（図示略）は、押付力制御部３９（図１参照）と電気的に接続されている。 As shown in FIG. 28C, in the thirteenth embodiment, the lower horizontal portion 27 and the upper horizontal portion 28 of the contact member 25 fixed to the housing 12 are formed in an annular plate shape. In this case, the outer diameters of the lower horizontal portion 27 and the upper horizontal portion 28 are set to be slightly larger than the outer diameter of the cutting stone 24. An elastic sensor (not shown) capable of detecting the contact position with the work W is provided on the entire peripheral surface of the lower horizontal portion 27 and the upper horizontal portion 28. The elastic sensor (not shown) is electrically connected to the pressing force control unit 39 (see FIG. 1).
　回転出力軸２２におけるベース部材７４と切断砥石２４との間の位置には、円筒状のベアリング８５が設けられている。ベアリング８５の前面及び右面には、２つの歪みゲージ３１がそれぞれ取着されている。各歪みゲージ３１は、押付力制御部３９（図１参照）と電気的に接続されている。 A cylindrical bearing 85 is provided at a position of the rotary output shaft 22 between the base member 74 and the cutting wheel 24. Two strain gauges 31 are attached to the front surface and the right surface of the bearing 85 respectively. Each strain gauge 31 is electrically connected to the pressing force control unit 39 (see FIG. 1).
　なお、押付力制御部３９（図１参照）は、第１モータ７６及び第２モータ８２と電気的に接続されている。押付力制御部３９（図１参照）は、第１モータ７６及び第２モータ８２の駆動を制御する。 The pressing force control unit 39 (see FIG. 1) is electrically connected to the first motor 76 and the second motor 82. The pressing force control unit 39 (see FIG. 1) controls the driving of the first motor 76 and the second motor 82.
　次に、第１３実施形態のディスクグラインダ１１の作用について説明する。 Next, the operation of the disk grinder 11 of the thirteenth embodiment will be described.
　使用者は、ディスクグラインダ１１のハウジング１２の把持部１３を把持した場合、スライドスイッチ４０をオンする。すると、図２８（ｃ）に示すように、回転モータ１７が駆動されて、切断砥石２４を下側水平部２７と上側水平部２８との間に収まった状態で回転させる。使用者が下側水平部２７及び上側水平部２８をワークＷに押し付けると、押付力制御部３９（図１参照）は、弾性センサー（図示略）からの信号を受信する。これにより、押付力制御部３９（図１参照）は、下側水平部２７及び上側水平部２８におけるワークＷとの接触位置（第１３実施形態では右前部）を認識する。 When the user grips the grip 13 of the housing 12 of the disc grinder 11, the user turns on the slide switch 40. Then, as shown in FIG. 28C, the rotary motor 17 is driven to rotate the cutting grindstone 24 in a state of being accommodated between the lower horizontal portion 27 and the upper horizontal portion 28. When the user presses the lower horizontal portion 27 and the upper horizontal portion 28 against the workpiece W, the pressing force control unit 39 (see FIG. 1) receives a signal from an elastic sensor (not shown). Thereby, the pressing force control unit 39 (see FIG. 1) recognizes the contact position (right front in the thirteenth embodiment) of the lower horizontal portion 27 and the upper horizontal portion 28 with the work W.
　すると、押付力制御部３９（図１参照）は、第１モータ７６及び第２モータ８２を駆動して、図２９（ａ）～（ｃ）に示すように、ベース部材７４を右へ移動させるとともにスライド部材８０を前へ移動させる。これにより、回転出力軸２２が下側水平部２７及び上側水平部２８におけるワークＷとの接触位置（本実施形態では右前部）へ向かって移動する。 Then, the pressing force control unit 39 (see FIG. 1) drives the first motor 76 and the second motor 82 to move the base member 74 to the right as shown in FIGS. 29 (a) to 29 (c). And the slide member 80 is moved forward. Thereby, the rotation output shaft 22 moves toward the contact position (the right front in this embodiment) with the work W in the lower horizontal portion 27 and the upper horizontal portion 28.
　そして、切断砥石２４がワークＷに対して押し付けられると、切断砥石２４によってワークＷが切断され始める。このとき、押付力制御部３９（図１参照）は、切断砥石２４のワークＷに対する押付力Ｆ１が閾値Ｓを超えると、第１実施形態と同様に、押付力Ｆ１が閾値Ｓ以下となるように第１モータ７６及び第２モータ８２の駆動を制御する。これにより、回転出力軸２２は、切断砥石２４のワークＷに対する押し付け方向において後退する。 Then, when the cutting stone 24 is pressed against the workpiece W, the cutting stone 24 starts cutting the workpiece W. At this time, when the pressing force F1 against the work W of the cutting stone 24 exceeds the threshold S, the pressing force control unit 39 (see FIG. 1) makes the pressing force F1 equal to or less than the threshold S as in the first embodiment. The drive of the first motor 76 and the second motor 82 is controlled. As a result, the rotational output shaft 22 retracts in the pressing direction of the cutting wheel 24 against the workpiece W.
　すると、ディスクグラインダ１１からワークＷに作用する力が、下側水平部２７によるワークＷに対する押付力Ｆ２、上側水平部２８によるワークＷに対する押付力Ｆ３、及び切断砥石２４によるワークＷに対する押付力Ｆ１の３つに分散される。このため、切断砥石２４のワークＷに対する押付力Ｆ１が低下する。 Then, a force acting on the work W from the disc grinder 11 is a pressing force F2 against the workpiece W by the lower horizontal portion 27, a pressing force F3 against the workpiece W by the upper horizontal portion 28, and a pressing force F1 against the workpiece W by the cutting wheel 24. Distributed in three. For this reason, the pressing force F1 on the workpiece W of the cutting wheel 24 is reduced.
　押付力制御部３９（図１参照）は、押付力Ｆ１が閾値Ｓ以下になると、第１モータ７６及び第２モータ８２の駆動を制御して回転出力軸２２を切断砥石２４のワークＷに対する押し付け方向において前進させる。このように、押付力制御部３９（図１参照）は、押付力Ｆ１が閾値Ｓを超えた状態が続かないように第１モータ７６及び第２モータ８２の駆動を制御することで、回転出力軸２２を介して切断砥石２４を移動させる。 When the pressing force F1 becomes equal to or less than the threshold value S, the pressing force control unit 39 (see FIG. 1) controls the driving of the first motor 76 and the second motor 82 to press the rotation output shaft 22 against the workpiece W of the cutting wheel 24. Advance in direction. As described above, the pressing force control unit 39 (see FIG. 1) controls the drive of the first motor 76 and the second motor 82 so that the pressing force F1 does not continue to exceed the threshold value S, thereby outputting the rotation output. The cutting wheel 24 is moved via the shaft 22.
　また、使用者が下側水平部２７及び上側水平部２８をワークＷから離すと、押付力制御部３９（図１参照）は、弾性センサー（図示略）からの信号が受信されなくなることで、下側水平部２７及び上側水平部２８がワークＷから離されたことを認識する。すると、押付力制御部３９（図１参照）は、第１モータ７６及び第２モータ８２を駆動して、切断砥石２４が下側水平部２７と上側水平部２８との間に収まった状態である最初の位置へ戻るように、回転出力軸２２を移動させる。 In addition, when the user separates the lower horizontal portion 27 and the upper horizontal portion 28 from the work W, the pressing force control unit 39 (see FIG. 1) does not receive a signal from an elastic sensor (not shown), It recognizes that the lower horizontal portion 27 and the upper horizontal portion 28 are separated from the work W. Then, the pressing force control unit 39 (see FIG. 1) drives the first motor 76 and the second motor 82 so that the cutting stone 24 is accommodated between the lower horizontal portion 27 and the upper horizontal portion 28. The rotary output shaft 22 is moved back to a certain initial position.
　以上詳述した第１３実施形態によれば上記（１）～（３）の効果に加え、次のような効果が発揮される。 According to the thirteenth embodiment described in detail above, in addition to the effects of the above (1) to (3), the following effects are exhibited.
　（１７）切断砥石２４をワークＷに押し付ける場合の複数の押し付け方向に対して切断砥石２４を移動させて押付力Ｆ１を抑制できるので、ワークＷの切断加工作業を効率よく行うことができる。 (17) The cutting wheel 24 can be moved in a plurality of pressing directions in the case of pressing the cutting wheel 24 against the work W to suppress the pressing force F1, so that the cutting work of the work W can be performed efficiently.
　（１８）下側水平部２７及び上側水平部２８におけるワークＷとの接触位置へ向かって切断砥石２４が自動的に移動するので、ワークＷの切断加工作業を円滑に行うことができる。 (18) Since the cutting stone 24 automatically moves toward the contact position of the lower horizontal portion 27 and the upper horizontal portion 28 with the work W, the work of cutting the work W can be smoothly performed.
　（変更例）
　なお、第１～１３実施形態は、次のように変更して具体化することも可能である。 (Modification example)
The first to thirteenth embodiments can be modified and embodied as follows.
　・第１～１３実施形態（第９実施形態を除く）において、接触部材２５における下側水平部２７及び上側水平部２８のうちいずれか一方を省略してもよい。 In the first to thirteenth embodiments (except the ninth embodiment), any one of the lower horizontal portion 27 and the upper horizontal portion 28 of the contact member 25 may be omitted.
　・第１～１３実施形態において、切断砥石２４の代わりに先端工具として、研削ディスクや研磨ディスクを用いてもよい。 In the first to thirteenth embodiments, a grinding disk or grinding disk may be used as a tip tool instead of the cutting wheel 24.
　・第１～１３実施形態において、回転モータ１７の代わりに駆動源としてエアコンプレッサを用いてもよい。 In the first to thirteenth embodiments, an air compressor may be used as a drive source instead of the rotary motor 17.
　・第１～１３実施形態において、モータ出力軸１８又は回転出力軸２２で回転モータ１７のトルクを検出する。この検出されたトルクがワークＷの切断加工中に急激に大きくなった場合（例えば、予め設定した基準値を超えた場合）に切断砥石２４のワークＷに対する押付力Ｆ１を調整して回転モータ１７のトルクを抑制するようにしてもよい。このようにすれば、回転モータ１７の過負荷によるディスクグラインダ１１の故障を抑制できる。 In the first to thirteenth embodiments, the torque of the rotation motor 17 is detected by the motor output shaft 18 or the rotation output shaft 22. When the detected torque increases sharply during cutting of the workpiece W (for example, when it exceeds a preset reference value), the pressing force F1 of the cutting stone 24 against the workpiece W is adjusted to adjust the rotation motor 17 Torque may be suppressed. In this way, it is possible to suppress the failure of the disk grinder 11 due to the overload of the rotary motor 17.
　・第１～１３実施形態において、回転モータ１７のモータ負荷を検出する。この検出したモータ負荷がワークＷの切断加工中に急激に大きくなった場合（例えば、予め設定した基準値を超えた場合）に切断砥石２４のワークＷに対する押付力Ｆ１を調整して回転モータ１７のモータ負荷を抑制するようにしてもよい。この場合、モータ負荷は、モータ電流、モータ電圧、モータ回転数、モータ温度などに基づいて検出される。 In the first to thirteenth embodiments, the motor load of the rotary motor 17 is detected. When the detected motor load increases rapidly during cutting of the work W (for example, when it exceeds a preset reference value), the pressing force F1 of the cutting stone 24 against the work W is adjusted to rotate the rotary motor 17 Motor load may be suppressed. In this case, the motor load is detected based on motor current, motor voltage, motor rotation number, motor temperature and the like.
　・動力工具は、ディスクグラインダ１１以外の電動工具（充電式または有線式）や空圧工具であってもよい。具体的には、ドリルドライバ、パワーカッタ、ジグソーなどが挙げられる。この場合、先端工具としては、動力工具に合わせて、ドリルビットやディスクソーなどが用いられる。 The power tool may be a power tool (rechargeable or wired) or a pneumatic tool other than the disk grinder 11. Specifically, a drill driver, a power cutter, a jigsaw, etc. may be mentioned. In this case, a drill bit, a disk saw or the like may be used as the tip tool in accordance with the power tool.
　・動力工具は、電動式に限らず、例えば、ハンドドリルなどの手動式の工具であってもよい。 The power tool is not limited to the electric tool, and may be, for example, a manual tool such as a hand drill.

Claims (9)

  1. 　動力工具の先端工具をワークに押し付けて前記ワークを加工する際に前記先端工具の前記ワークに対する押付力を調整する押付力調整装置であって、
    　前記押付力を検出する押付力検出部と、
    　前記押付力を抑制する押付力抑制部と、
    　前記押付力検出部で検出された前記押付力が、予め設定された設定値以下となるように、前記押付力抑制部の動作を制御する押付力制御部とを備える、押付力調整装置。     A pressing force adjusting device for adjusting a pressing force of the tip tool against the work when pressing the tip tool of the power tool against the work to process the workpiece,
    A pressing force detection unit that detects the pressing force;
    A pressing force suppression unit that suppresses the pressing force;
    A pressing force adjusting device, comprising: a pressing force control unit that controls an operation of the pressing force suppression unit such that the pressing force detected by the pressing force detection unit becomes equal to or less than a preset set value.
  2. 　前記押付力抑制部の動作に従って、前記先端工具と相対移動して、前記先端工具とともに前記ワークに接触可能な接触部材を備える、請求項１に記載の押付力調整装置。 The pressing force adjusting device according to claim 1, further comprising: a contact member that can move relative to the tip tool according to the operation of the pressing force suppression unit and can contact the workpiece together with the tip tool.
  3. 　前記押付力制御部は、前記押付力検出部で検出された前記押付力が、予め設定された設定値よりも大きい場合、前記接触部材を前記先端工具とともに前記ワークに接触させるように前記押付力抑制部の動作を制御する、請求項２に記載の押付力調整装置。 When the pressing force detected by the pressing force detection unit is larger than a preset setting value, the pressing force control unit causes the contact member to contact the workpiece with the tip tool. The pressing force adjustment device according to claim 2, which controls the operation of the suppression unit.
  4. 　前記接触部材は、
    　前記先端工具の両側に設けられ、前記ワークに接触可能な第１の接触部および第２の接触部を含む、請求項２に記載の押付力調整装置。     The contact member is
    The pressing force adjustment device according to claim 2, further comprising: a first contact portion and a second contact portion provided on both sides of the tip tool and capable of contacting the workpiece.
  5. 　前記押付力抑制部は、前記先端工具の前記ワークに対する押し付け方向に前記先端工具を前進させるとともに前記押し付け方向とは反対方向に後退させる移動機構を含む、請求項１～４のいずれか１項に記載の押付力調整装置。 The pressing force suppressing portion includes a moving mechanism for advancing the tip tool in the pressing direction of the tip tool with respect to the work and for retracting the tip tool in the direction opposite to the pressing direction. Pressing force adjustment device described.
  6. 　前記押付力抑制部は、前記先端工具の前記ワークに対する複数の押し付け方向に選択的に前記先端工具を前進させるとともに前記複数の押し付け方向とは反対側の複数の方向に選択的に後退させる移動機構を含む、請求項１～５のいずれか１項に記載の押付力調整装置。 The pressing force suppression unit is a moving mechanism that selectively advances the tip tool in a plurality of pressing directions of the tip tool with respect to the workpiece and selectively retracts the tip tool in a plurality of directions opposite to the plurality of pressing directions. The pressing force adjusting device according to any one of claims 1 to 5, including:
  7. 　前記接触部材は、前記動力工具に対して着脱可能に取り付けられる、請求項２～請求項６のうちいずれか一項に記載の押付力調整装置。 The pressing force adjustment device according to any one of claims 2 to 6, wherein the contact member is detachably attached to the power tool.
  8. 　動力工具であって、
    　前記先端工具を取り付けるための取付部と、
    　前記取付部に取り付けられた前記先端工具を駆動する駆動源と、
    　請求項１～請求項７のうちいずれか一項に記載の押付力調整装置とを備える、動力工具。     A power tool,
    A mounting portion for mounting the tip tool;
    A drive source for driving the tip tool attached to the attachment portion;
    A power tool comprising the pressing force adjusting device according to any one of claims 1 to 7.
  9. 　前記押付力検出部は、前記駆動源に取り付けられ、
    　前記駆動源は、前記先端工具と一体的に移動するように構成される、請求項８に記載の動力工具。     The pressing force detection unit is attached to the drive source,
    The power tool of claim 8, wherein the drive source is configured to move integrally with the tip tool.
PCT/JP2013/002971 2012-05-11 2013-05-08 Pressing force adjusting device and power tool WO2013168425A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012109391A JP5909644B2 (en) 2012-05-11 2012-05-11 Pushing force adjusting device and power tool
JP2012-109391 2012-05-11

Publications (1)

Publication Number Publication Date
WO2013168425A1 true WO2013168425A1 (en) 2013-11-14

Family

ID=49550488

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/002971 WO2013168425A1 (en) 2012-05-11 2013-05-08 Pressing force adjusting device and power tool

Country Status (2)

Country Link
JP (1) JP5909644B2 (en)
WO (1) WO2013168425A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9954418B2 (en) 2014-03-17 2018-04-24 Makita Corporation Power tool
JP5961711B2 (en) * 2015-01-22 2016-08-02 株式会社マキタ Rechargeable grinder
JP6881037B2 (en) * 2017-05-31 2021-06-02 工機ホールディングス株式会社 Electric tool
US11697200B2 (en) * 2017-07-24 2023-07-11 Festool Gmbh Power tool and method
JP2017226072A (en) * 2017-10-03 2017-12-28 株式会社マキタ Electrically-driven tool
JP7210261B2 (en) 2018-12-14 2023-01-23 株式会社マキタ ELECTRIC WORKING MACHINE AND METHOD FOR MANUFACTURING STATOR IN MOTOR FOR ELECTRIC WORKING MACHINE

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4939266Y1 (en) * 1970-12-30 1974-10-28
JPH03221408A (en) * 1990-01-29 1991-09-30 Shimomura Seisakusho:Kk Method for cutting brittle material
JPH04294972A (en) * 1991-03-22 1992-10-19 Toshiba Eng Co Ltd Surfacing device
JPH06339848A (en) * 1993-05-29 1994-12-13 Shikishima Boseki Kk Curved surface polishing method for stone or the like and device thereof
JPH07108451A (en) * 1993-10-14 1995-04-25 Mitsubishi Heavy Ind Ltd Polishing device
JPH07256546A (en) * 1994-03-18 1995-10-09 Mitsubishi Heavy Ind Ltd Automatic grinding device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4939266Y1 (en) * 1970-12-30 1974-10-28
JPH03221408A (en) * 1990-01-29 1991-09-30 Shimomura Seisakusho:Kk Method for cutting brittle material
JPH04294972A (en) * 1991-03-22 1992-10-19 Toshiba Eng Co Ltd Surfacing device
JPH06339848A (en) * 1993-05-29 1994-12-13 Shikishima Boseki Kk Curved surface polishing method for stone or the like and device thereof
JPH07108451A (en) * 1993-10-14 1995-04-25 Mitsubishi Heavy Ind Ltd Polishing device
JPH07256546A (en) * 1994-03-18 1995-10-09 Mitsubishi Heavy Ind Ltd Automatic grinding device

Also Published As

Publication number Publication date
JP5909644B2 (en) 2016-04-27
JP2013237105A (en) 2013-11-28

Similar Documents

Publication Publication Date Title
WO2013168425A1 (en) Pressing force adjusting device and power tool
US10272548B2 (en) Electric screwdriver
US6929074B1 (en) Elbow-type power hand tool
US20110179649A1 (en) Pipe cutter having a detachable cutting head
US20060005401A1 (en) Power tool
EP3326742A2 (en) Power tool with a dust collecting device
GB2476372A (en) Torque coupling with axially displaceable ring gear
WO2006034712A8 (en) A linear actuator
JP2013144340A (en) Electric power tool
WO2020241086A1 (en) Electric tool
US20070180709A1 (en) Circular saw with rotatable handle
JP6602869B2 (en) Power tool with nested output shaft
US10016835B2 (en) Method for grinding electrode tip
CN112264803B (en) Digital automatic control hydraulic porous drilling machine
CN110549122B (en) Boring and milling dual-purpose switching processing equipment
CN110962079A (en) Hand-held tool
US20220324078A1 (en) File belt sander
JP2016010832A (en) Nut fastening machine
CN104552183B (en) Hand held electric tool
CN210452083U (en) Clutch bearing processing equipment
CN218904812U (en) Adjusting and locking mechanism of wire drawing wheel
CN217904200U (en) Electric tool
CN215941549U (en) High safety electric drill controller
JP2013132704A (en) Torque wrench device and nut runner with torque wrench using the same
CN214489673U (en) Automatic locking universal material clamping mechanism for multi-station milling cutter processing machine

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13788044

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13788044

Country of ref document: EP

Kind code of ref document: A1