US20070056416A1 - Cutting devices - Google Patents
Cutting devices Download PDFInfo
- Publication number
- US20070056416A1 US20070056416A1 US11/519,942 US51994206A US2007056416A1 US 20070056416 A1 US20070056416 A1 US 20070056416A1 US 51994206 A US51994206 A US 51994206A US 2007056416 A1 US2007056416 A1 US 2007056416A1
- Authority
- US
- United States
- Prior art keywords
- mount
- splitter
- guard
- saw blade
- workpiece
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
- B23D47/04—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of devices for feeding, positioning, clamping, or rotating work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
- B27G19/08—Accessories for keeping open the saw kerf, e.g. riving knives or wedge plates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S83/00—Cutting
- Y10S83/01—Safety devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/202—With product handling means
- Y10T83/2074—Including means to divert one portion of product from another
- Y10T83/2077—By kerf entering guide
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/727—With means to guide moving work
- Y10T83/732—With guard
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7684—With means to support work relative to tool[s]
- Y10T83/773—Work-support includes passageway for tool [e.g., slotted table]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/768—Rotatable disc tool pair or tool and carrier
- Y10T83/7734—With guard for tool
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/869—Means to drive or to guide tool
- Y10T83/872—With guard means
Definitions
- the present invention relates to cutting devices, and in particular to table saws having a table for placing workpieces thereon and a saw blade partially protruding upward from the upper surface of the table.
- Table saws have a table for placing workpieces thereon and a circular saw blade that partially protrudes upward from the upper surface of the table, so that workpieces may be cut by moving workpieces along the upper surface of the table toward the saw blade in a direction parallel to the surface of the saw blade.
- a guard device in order to prevent potential interference of the other articles with the upper portion of the saw blade protruding from the table surface.
- the known guard device has a guard plate that is configured to cover the saw blade primarily from right and left sides and the upper side.
- the guard device is configured such that the guard plate is moved upward or opened by the Workpiece as the workpiece moves toward the saw blade.
- the guard plate is vertically pivotally mounted to a splitter.
- a saw blade of the table saw rotates in such a direction that the saw blade moves downward on the side of the position of the workpiece before it is cut (hereinafter called “front side with respect to cutting direction”), while the saw blade moves upward on the side of the position of the workpiece after it has been cut (hereinafter called “rear side with respect to cutting direction”). Therefore, if the cut surfaces of the workpiece contact the rear side of the rotating saw blade immediately after the workpiece has been cut, the workpiece may be forced upward by the rotating saw blade in some occasion. This phenomenon is called “kickback phenomenon.” When this phenomenon occurs, it is difficult to smoothly perform the cutting operation.
- a splitter also called “riving knife” having substantially the same thickness as the saw blade on the rear side of the saw blade and within the same plane as the saw blade.
- the splitter may enter the cut of the workpiece and maintain the cut width of the workpiece in order to avoid contact of the rotating saw blade with the cut surfaces.
- kickback preventing claw members on opposite sides of the splitter within a region where the kickback preventing claw members may not interfere with the movement of the workpiece in the cutting direction.
- Japanese Laid-Open Utility Model Publication No. 3-42602 and U.S. Pat. No. 6,405,624 teach known kickback preventing claw members.
- a splitter and kickback preventing claw members for preventing the kickback phenomenon in addition to a guard device for preventing interference of other articles with the saw blade.
- a guard plate of the guard device and kickback preventing claw members are respectively vertically pivotally supported on the upper portion of the splitter.
- the kickback preventing claw members will not contact the sheet during the cutting operation. Therefore, by configuring the kickback preventing claw members to be able to be removed from the splitter, the operability for this kind of cutting operation can be improved. In addition, the operation for changing the saw blade can be conveniently performed if the kickback preventing claw members are removed from the splitter in order to keep the kickback preventing claw members as far away from the saw blade as possible.
- the guard plate of the guard device and each of the kickback preventing claw members are individually supported on the splitter.
- a problem occurs such that the mounting and removing operations of the guard plate and the kickback preventing claw members are very difficult when such operations are necessary for changing the saw blade.
- One embodiment of the present invention is an improved cutting device constructed to reduce potential troubles in performing the operations for removing a guard device and a kick-back preventing claw member from a splitter.
- cutting devices in another embodiment, include a table for placing a workpiece thereon, and a saw blade protruding from an upper surface of the table.
- a splitter positioned on the front side with respect to a cutting direction of the saw blade and in alignment with the saw blade.
- a guard device is provided for covering the saw blade.
- a kickback preventing claw member prevents the workpiece from being forced upward by the saw blade after the workpiece has been cut by the saw blade.
- a mount frame is detachably mounted to an upper portion of the splitter. The guard device and the kickback preventing claw member are supported on the mount frame, so that the guard device and the kickback preventing claw can be removed together from the splitter.
- FIG. 1 is a side view of a table saw according to one embodiment of the present invention.
- FIG. 2 is an enlarged side view of a portion around a saw blade of the table saw
- FIG. 3 is a plan view as viewed from a direction indicated by an arrow ( 3 ) in FIG. 2 ;
- FIG. 4 is a vertical sectional view showing the state where a mount holder of a guard device has been inserted into a mount frame;
- FIG. 5 is a vertical sectional view similar to FIG. 4 but showing the state where the mount holder is being removed from the mount frame;
- FIG. 6 is a plan view as viewed from a direction indicated by an arrow ( 6 ) in FIG. 4 ;
- FIG. 7 is a side view of the guard device after removal from the mount fame:
- FIG. 8 is a rear view of the guard device with first and second guard plates shown in vertical sectional views
- FIG. 9 is a side view of a mount mechanism and showing the state where a mount frame has been mounted to a splitter
- FIG. 10 is a side view similar to FIG. 9 but showing the state where the mount frame has been removed from the splitter;
- FIG. 11 is a horizontal sectional view of the mount mechanism
- FIG. 12 is a side view of the mount mechanism and also showing kickback preventing claw members
- FIG. 13 is a side view of the splitter and showing the state where the mount frame has been removed from the splitter;
- FIG. 14 is a vertical sectional view showing a mount base and the splitter mounted thereto.
- FIG. 15 is a plan view showing the mount base and the splitter.
- FIG. 1 shows an overall view of a cutting device 1 according to one embodiment.
- the cutting device 1 is embodied as a table saw.
- the cutting device 1 is characterized in a support structure for supporting kickback preventing claw members 60 and a guard device 50 .
- a table 2 is supported substantially horizontally by a base structure 10 .
- a circular saw blade 3 is positioned substantially centrally of the table 2 and has an upper portion extending from the upper surface of the table 2 .
- the saw blade 3 is supported by a lift base 5 disposed below the table 2 so as to be rotatably driven by an electric motor 7 .
- the lift base 5 is slidably supported by vertical rods 6 that are mounted on the base structure 10 , so that the lift base 5 can move in parallel in the vertical direction.
- the workpiece W can be cut as it is moved in a direction indicated by an outline arrow (hereinafter called “cutting direction”) along the upper surface of the table 2 .
- a splitter 20 is disposed on the front side (left side as viewed in FIG. 1 ) of the saw blade 3 with respect to the cutting direction.
- the splitter may be also called “riving knife.”
- the splitter 20 is made of a flat plate having a thickness substantially equal to the thickness of the saw blade 3 and is positioned within the same plane as the saw blade 3 .
- the splitter 20 is mounted on a base portion 5 a of the lift base 5 via a mount base 25 in such a manner that the upper portion of the splitter 20 protrudes upward from the upper surface of the table 2 .
- the splitter 20 is adapted to enter the cut just after the cut has been foxmed in the workpiece W in order to keep the cut width constant. Therefore, opposite cut surfaces are prevented from contacting with the rotating saw blade 3 , so that a phenomenon called “kickback phenomenon” can be avoided.
- the kickback preventing claw members 60 and the guard device 50 are mounted to the upper end of the splitter 20 , which protrudes upward from the upper surface of the table 2 , via a mount frame 30 .
- the mount frame 30 and the guard device 50 are shown in detail in FIGS. 2 to 9 .
- the mount frame 30 includes a tubular portion 30 T disposed on the rear side thereof with respect to the cutting direction (left side as viewed in FIG. 2 ).
- the tubular portion 30 T has a rectangular cross section and includes a top part 30 a , a left part 30 b , a right part 30 c and a bottom part 30 d
- the top part 30 a , the left part 30 b and the right part 30 c extend forwardly with respect to the cutting direction to form an inverted U-shape portion 30 U.
- the left and right parts 30 b and 30 c further extend forwardly to form protection arms 30 e and 30 f that are parallel to each other.
- the front ends of the protection arms 30 e and 30 f are joined to each other via a joint, to which two claw-retaining springs 61 are attached. The function of the claw-retaining springs 61 will be described later.
- the guard device 50 is removably mounted to the tubular portion 30 T of the mount frame 30 configured as described above.
- the guard device 50 in the removed state from the tubular portion 30 T is shown in FIG. 7 .
- the guard device 50 has a mount holder 51 insertable into the tubular portion 30 T, a guard frame 52 extending rearwardly with respect to the cutting direction from the mount holder 51 (rightward as viewed in FIG. 7 ), a guard holder 53 disposed at the front end of the guard frame 52 , a pair of right and left first guard plates 55 and a pair of right and left second guard plates 56 .
- the first guard plates 55 and the second guard plates 56 are vertically pivotally supported by the guard holder 53 via a support rod 54 .
- the mount holder 51 has a substantially rectangular parallelepiped hollow configuration and is insertable into the tubular portion 30 T without producing substantial clearance.
- the mount holder 51 is manufactured into one piece by a molding process of a synthetic resin.
- a removing operation lever 51 a is vertically movably disposed on the upper portion of the mount holder 51 .
- the removing operation lever 51 a is molded integrally with the upper portion of the mount holder 51 while the removing operation lever 51 a being delimited from the upper portion of the mount holder 51 by a cut line. Because the removing operation lever 51 a is made of a synthetic resin same as the mount holder 51 , the removing operation lever 51 a has a resiliency in the vertical direction.
- the removing operation lever 51 a When in the state where no load is applied to the removing operation lever 51 a , the removing operation lever 51 a is held to extend substantially flush with the upper portion of the mount holder 51 as shown in FIG. 4 .
- the removing operation lever 51 a When a load is applied to press the removing operation lever 51 a downwards the removing operation lever 51 a may pivot downward due to the resilient deformation of its base end joined to the upper portion of the mount holder 51 .
- the removing operation lever 51 a resiliently recover the position to extend substantially flush with the upper portion of the mount holder 51 .
- An insertion preventing stop 51 c and a removal preventing stop 51 b are formed integrally with the upper surface of the removing operation lever 51 a .
- the insertion preventing stop 51 c may engage with the rear end of the top part 30 a defining the rear opening of the tubular portion 30 T, so that no further inserting movement of the mount holder 51 may be restricted.
- the removal preventing stop 51 b may enter and engages a stop hole 30 b formed in the top part 30 a of the tubular portion 30 T, so that the mount holder 51 may be prevented from being removed from the tubular portion 30 T. In this way, it is possible to maintain the mounted state of the guard device 50 to the mount frame 30 .
- the removal preventing stop 51 b moves downward so as to be removed from the stopper hole 30 b , so that the mount holder 51 can be removed from the tubular portion 30 T as shown in FIG. 5 .
- the mount holder 51 removed from the tubular portion 30 T, it is possible to remove the guard device 50 from the mount frame 30 .
- a stop wall 51 d is formed on the rear end (right end as viewed in FIGS. 4 and 5 ) of the mount holder 51 and extends downward therefrom.
- the stop wall 51 d substantially contacts the rear end of the bottom part 30 d of the tubular portion 30 T, so that the inserting movement of the mount holder 51 is restricted also by the stop wall 51 d.
- the mount holder 51 is fixedly attached to the front end of the guard fame 52 .
- the guard frame 52 extends rearward from the mount holder 51 .
- the guard frame 52 is held to horizontally extend rearward from the mount holder 51 .
- the guard frame 52 can be formed by a single round bar that is bent to have a substantially U-shape configuration elongated along the central axis of U-shape. Opposite ends 52 a of the guard frame 52 are respectively inserted into and engaged with engaging holes 51 e formed in the mount holder 51 . In addition, the parallel leg portions of the guard frame 52 are respectively fitted into engaging recesses 51 f that are formed in opposite sides of the mount holder 51 and extend in forward and rearward directions. With this arrangement, the guard frame 52 is fixed in position relative to the mount holder 51 in such a state that the guard frame 52 extends reward from the mount holder 51 . A strip plate instead of a round bar may be bent into U-shape to form the guard frame 52 .
- the guard holder 53 can be held by the rear end (right end as viewed in FIG. 2 ) of the guard frame 52 so as to be fixed in position relative thereto.
- the guard holder 53 can include a support shaft 54 that has opposite ends extending laterally outward from the guard holder 53 .
- the pair of the first guard plates 55 and the pair of the second guard plates 56 are vertically pivotally supported by the opposite ends of the support shaft 54 .
- the first guard plates 55 are arranged symmetrically to each other.
- the second guard plates 56 are arranged symmetrically to each other.
- the first and second guard plates 55 and 56 may serve to cover the saw blade 3 from opposite sides with respect to the lateral direction. More specifically, the second guard plates 56 are designed so as to lap over the respective first guard plates 55 from the laterally outer side.
- Stopper edges 55 a are respectively formed on the upper portions of the first guard plates 55 in substantially the central position along the forward and rearward directions (right and left directions as viewed in FIG. 7 ) and extend toward each other. As shown in FIG. 3 , the stopper edges 55 a can contact the guard frame 52 from its upper side in order to limit the lower pivotal stroke end of the first guard plates 55 .
- stopper edges 56 a are respectively formed on the upper portions of the second guard plates 56 in a position nearer to their pivotal axis and extend toward each other.
- the stopper edges 56 a may contact the upper edges of the first guide plates 55 in order to limit the lower pivotal stroke end of the second guard plates 56 relative to the first guard plates 55 .
- the stopper edges 55 a of the first guard plates 55 contact with the guard frame 52 from the upper side, so that the first guard plates 55 are positioned in the lower pivotal stroke end. In this lower pivotal stroke end, the first guard plates 55 do not contact the upper surface of the table 2 , while the lower edges of the second guard plates 56 are in contact with the upper surface of the table 2 . Therefore, the stopper edges 56 a of the second guard plates 56 are not in contact with the upper edges of the first guard plates 55 .
- the front end of the workpiece W may force to pivot the second guard plates 56 upward.
- the second guard plates 56 are opened in order to permit movement of the work piece W. If the workpiece W has a relatively large thickness, the front end of the workpiece W may further force to pivot the first guard plates 55 upward to open the same.
- the guard plates 55 and 56 can pivot about the support shaft 54 or pivot about the same axis.
- a stopper projection 56 b and an interlocking stepped portion 56 c are formed on each of the second guard plates 56 .
- the interlocking stepped portions 56 c engage the lower edges of the respective first guard plates 55 . Therefore, as the second guard plates 56 further pivot upward by the movement of the workpiece W, the first guard plates 55 may pivot upward together with the second guard plates 56 .
- the stopper projections 56 b can engage the respective leg portions of the guard frame 52 from the upper side by the resilient deformation of portion of the second guard plates 56 about the stopper projections 56 b . With the stopper projections 56 b thus engaged with the respective leg portions of the guard frame 52 , the first and second guard plates 55 and 56 are temporarily held in fully opened positions. The fully opened positions are indicated by dashed-two dotted lines in FIG. 7 .
- first guard plates 55 and the second guard plates 56 are provided in pairs in this embodiment, one first guard plate and one second guard plate can be provided, or three or more first guard plates and three or more second guard plates can be provided.
- a mount mechanism 40 can be disposed within the inverted U-shape portion 30 U of the mount frame 30 .
- the U-shape portion 40 U is positioned substantially centrally of the mount frame 30 with respect to the forward and rearward directions.
- the details of the mount mechanism 40 are shown in FIGS. 9 to 11 .
- the mount mechanism 40 has a lever 41 that can be pivoted by the operator.
- the lever 41 is pivotally supported by a fixed shaft 42 that extends between the left part 30 b and the right part 30 c of the mount frame 30 .
- the upper portion of the lever 41 extends upward through and beyond the top part 30 a of the mount frame 30 .
- lever 41 is vertically pivotally supported by fixed shaft 42 .
- a front engaging roller 47 is rotatably supported by the fixed shaft 42 .
- a pivotal shaft 43 can be mounted to the lever 41 in a position away from its pivotal axis, so that the pivotal shaft 43 can be positioned away from the fixed shaft 42 by a predetermined distance.
- An intermediate engaging roller 48 can be rotatably supported by the pivotal shaft 43 .
- One end of an arm 44 is vertically pivotally supported by the pivotal shaft 43 .
- a shiftable shaft 45 can be attached to the other end of the arm 44 .
- a rear engaging roller 46 is rotatably supported by the shiftable shaft 45 .
- Opposite ends of the shiftable shaft 45 are slidably inserted into control slots 30 h and 30 i that are respectively formed in the left part 30 b and the right part 30 c of the mount frame 30 .
- the control slots 30 h and 30 i are elongated in forward and rearward directions, so that the shiftable shaft 45 can move together with rear engaging roller 46 in parallel in forward and rearward directions (left and right directions as viewed in FIGS. 9 to 11 ) along the control slots 30 h and 30 i within a predetermined range.
- the fixed shaft 42 is positioned within a plane J, within includes the longitudinal axes of the control slots 30 h and 30 i.
- the arm pivots in a counterclockwise direction as shown in FIG. 9 , so that the rear engaging roller 46 moves away from the front engaging roller 47 .
- the intermediate engaging roller 48 moves downward to interleave between the front engaging roller 47 and the rear engaging roller 46 and may force the rear engaging roller 46 to move the same rearward.
- the pivotal shaft 43 supporting the intermediate engaging roller 48 moves across the plane J from a position above the plane J to a position slightly below the plane J. Then, the rear engaging roller 46 may be temporarily locked in a position that is away from the front engaging roller 47 .
- lock position The position of the lever 41 in this state will be hereinafter called “lock position.”
- the plane J defines a dead point of the lock mechanism constituted by three engaging rollers 46 , 47 and 48 .
- the locking operation of these three engaging rollers 46 , 47 and 48 by the operation of the lever 41 will be explained later.
- a circumferential engaging recess 47 a and a circumferential engaging recess 46 a are respectively formed in the outer circumferential surfaces of the front engaging roller 47 and the rear engaging roller 46 throughout their circumferential lengths.
- each of the engaging recesses 47 a and 46 a can have a substantially V-shape cross section and can have a maximum width that is slightly greater than the thickness of the splitter 20 .
- a circumferential engaging projection 48 a engageable with the circumferential recess 46 a of the rear engaging roller 46 can be formed on the outer circumferential surface of the intermediate engaging roller 48 .
- the engaging projection 48 a has a width that is substantially equal to the thickness of the splitter 20 .
- a first slot 20 a and a second slot 20 b can be formed in the upper portion of the splitter 20 .
- the first slot 20 a extends into the splitter 20 from the upper edge of the splitter 20 as shown in FIG. 20 , so that the first slot 20 a has an upper opening having a width L 1 with respect to forward and rearward directions.
- the second slot 20 b is formed in continuity with the lower portion of the first slot 20 a and is elongated in forward and rearward directions, so that the second slot 20 b has a width L 2 that is greater than the width L 1 (L 2 >L 1 ).
- the distance between the front side portion of the front engaging roller 47 and the rear side portion of the rear engaging roller 46 may be reduced to be smaller than the width L 1 . Therefore, with the distance thus reduced, the front and rear engaging rollers 47 and 46 can enter the first slot 20 a of the splitter 20 and further enter the second slot 20 b . Then, the operator may pivot the lever 41 downward to move the rear engaging roller 46 away from the front engaging roller 47 , so that the rear engaging roller 46 engages the rear end of the second slot 20 b and the front engaging roller 47 engages the front end of the second slot 20 b .
- the intermediate engaging roller 48 presses the front and rear engaging rollers 47 and 46 against portions of the splitter 20 , which define front and rear ends of the second slot 20 b .
- the mount mechanism 40 can be held to be mounted to the splitter 20 .
- the distance between the front side portion of the front engaging roller 47 and the rear side portion of the rear engaging roller 46 is greater than the width L 1 of the first slot 20 a . Therefore, these engaging rollers 47 and 46 are restricted from moving through the first slot 20 a .
- portions of the splitter 20 defining the front and rear ends of the second slot 20 b engages the engaging recesses 47 a and 46 a of the front and rear engaging rollers 47 and 46 .
- the engaging projection 48 a of the intermediate engaging roller 48 contacts the engaging recess 46 a of the rear engaging roller 46 to thereby press the rear engaging roller 47 against the portion of the splitter 20 defining the rear end of the second slot 20 b and to press the front engaging roller 47 against the portion of the splitter 20 defining the front end of the second slot 20 b by a reaction force.
- the engaging recesses 47 a and 46 a of the front and rear engaging rollers 47 and 46 are reliably held to be engaged with the portions of the splitter 20 defining the front and rear ends of the second slot 20 b .
- the front and rear engaging rollers 47 and 46 are reliably held in position relative to the splitter 20 with respect to the direction parallel to the surface of the splitter 20 and also with respect to the direction substantially perpendicular to the surface of the splitter 20 .
- This may reliably hold the mounted state of the mount frame 30 and eventually the mounted state of the guard device 50 and the kickback preventing claw members 60 to the splitter 20 .
- the operator may pivot the lever 41 upward to move the rear engaging roller 46 toward the front engaging roller 47 until the distance between the front side portion of the front engaging roller 47 and the rear side portion of the rear engaging roller 46 becomes smaller than the width L 1 . Then, the front and rear engaging rollers 47 and 46 can be moved from the second slot 20 b to the first slot 20 a and further to the outside of the splitter 20 . Therefore, the mount mechanism 40 can be removed from the splitter 20 . Removing the mount mechanism 40 from the splitter 20 can also result in the removal of the mount frame 30 , guard device 50 and the kickback preventing claw members 60 from the splitter 20 .
- the mount mechanism 40 enables the mount frame 30 , the guard device 50 and the kickback preventing claw members 60 to be reliably mounted to and removed from the splitter 20 by a simple vertical pivoting operation of the lever 41 .
- each torsion spring 62 engages the top part 30 a of the mount frame 30 and the other end of each torsion spring 62 engages the corresponding kickback preventing claw member 60 from its upper side. Therefore, the torsion springs 62 serve to normally urge the kickback preventing claw members 60 downward.
- the kickback preventing claw members 60 can be disposed on laterally opposite sides of the saw blade 3 and each can include claws 60 a at its lower side as shown in FIG. 12 for engaging the workpiece W. With the workpiece W pressed downward against the surface of the table 2 by the claws 60 a of the kickback preventing claw members 60 , the workpiece W may be prevented from being accidentally lifted due to the kickback phenomenon that may be caused by the force applied to the workpiece W by the rotating saw blade 3 . Claws 60 a can include other configurations as long as it provides favorable interaction with the workpiece W.
- the left and right protection arms 30 e and 30 f extend forwardly from the left and right side parts 30 b and 30 c of the inverted U-shaped portion 30 U of the mount frame 30 .
- two claw holding springs 61 can be mounted between the front ends of the protection arms 30 e and 30 f.
- the kickback preventing claw members 60 By engaging the front ends of the kickback preventing claw members 60 with the claw holding springs 61 after pivoting the kickback preventing claw members 60 upward against the biasing forces of the torsion springs 62 , it is possible to hold the kickback preventing claw members 60 at an upward rest position. At the rest position, the kickback preventing claw members 60 are positioned to extend substantially along the respective protection arms 30 e and 30 f . Therefore, the laterally outer sides of the kickback preventing claw members 60 can be covered by the respective protection arms 30 e and 30 f , so that other structural members can be reliably prevented from accidental interference with the kickback preventing claw members 60 .
- the splitter 20 can be mounted on the base portion 5 a of the lift base 5 via the mount base 25 .
- the base portion 5 a extends forwardly from the lift base 5 as shown in FIG. 1 .
- the details of the mount base 25 are shown in FIGS. 13 and 14 .
- the mount base 25 can include a fixed base 21 and a clamp plate 22 .
- the fixed base 21 is fixedly mounted on the base portion 5 a of the lift base 5 via bolts 21 a .
- the clamp plate 22 is adapted to clamp the lower portion of the splitter 20 in the direction of its thickness against the fixed base 21 .
- Upper and lower support shafts 23 extend between the fixed base 21 and the clamp plate 22 .
- the support shafts 23 have stepped portions for engaging the clamp plate 22 .
- Nuts 23 b engage with the support shafts 23 from the side opposite to the stepped portions with respect to the clamp plate 22 , so that the support shafts 23 are fixed in position by the tightening forces applied to the nuts 23 b .
- Compression springs 24 are interposed between heads 23 a of the support shafts 23 and the fixed base 21 , so that the compression springs 24 bias the clamp plate 22 in a direction toward the fixed base 21 or the direction for clamping the splitter 20 .
- a fixing screw 29 fixes one of the support shafts 23 in position relative to the clamp plate 22 , so that the clamp plate 22 can be fixed in position relative to the fixed base 21 .
- an elongated mount slot 20 c can be formed in the lower portion of the splitter 20 and is opened at the lower edge of the splitter 20 .
- the mount slot 20 c extends along an arc about the rotational axis of the saw blade 3 .
- the support shafts 23 are inserted into the mount slot 20 c.
- a plurality of substantially semicircular recesses 20 d can be formed in the front edge of the splitter 20 .
- Two semicircular recesses 20 d can be included in this embodiment.
- the fixed base 21 has a fixing shaft 27 that extends throughout the thickness of the fixed base 21 .
- a compression spring 26 is interposed between a head 27 a of the fixing shaft 27 and the fixed base 21 in order to bias the fixing shaft 27 in the right direction as viewed in FIG. 14 .
- a fixing block 28 having a substantially truncated conical configuration is attached to the left end of the fixing shaft 27 and is engageable with any one of the semicircular recesses 20 d in order to fix the splitter 20 in position relative to the mount base 25 through cooperation with the support shafts 23 .
- the clearance between the clamp plate 22 and the fixed base 21 can be adjusted by the following process.
- the fixing screw 29 is loosened; so that the clamp plate 22 is biased toward the fixed base 21 by the compression springs 24 .
- the clamp plate 22 therefore contacts with the fixed base 21 .
- the splitter 20 is inserted between the clamp plate 22 and the fixed base 21 from the upper side.
- an upper corner portion 21 a of the fixed base 21 and an upper corner portion 22 a of the clamp plate 22 which can be oppose to each other, are chamfered. Therefore, so that the splitter 20 can be wedged between the fixed base 21 and the clamp plate 22 under the guide of the chamfered upper corner portions 21 a and 22 a .
- the fixed base 21 and the clamp plate 22 can be spaced from each other by the distance corresponding to the thickness of the splitter 20 .
- the fixing screw 29 is tightened to fix the clamp plate 22 in position relative to the fixed base 21 , so that the clearance between the fixed base 21 and the clamp plate 22 may be maintained.
- the support shaft 23 that is disposed on the lower side as viewed in FIG. 14 is not fixed in position relative to the fixed base 21 .
- the compression spring 24 associated with the lower support shaft 23 does not act to move the clamp plate 22 , because the fixed base 21 and the clamp plate 22 are fixed in position by the fixing screw 29 associated with the upper support shaft 23 .
- the clearance between the clamp plate 22 and the fixed base 21 can be set and fixed to correspond to the thickness of the splitter 20 to be used, potential movement in the direction of thickness of the splitter 20 is reduced while the adjustment of vertical position of the splitter 20 along the mount slot 20 c may be possible.
- the same setting process can be applied to different splitters having different thicknesses.
- the operator can insert the lower portion of the splitter 20 into the clearance between the clamp plate 22 and the fixed base 21 such that the support shafts 23 enter the mount slot 20 c .
- the splitter 20 has been moved in such a position that any one of the fixing recess 20 d of the splitter 20 opposes the fixing block 28 of the fixing shaft 27 , the fixing block 28 can engage with the fixing recess 20 d due to the biasing force of the compression spring 26 .
- the splitter 20 can be fixed in position with respect to both the direction perpendicular to the thickness of the splitter 20 and the direction parallel to the surface of the splitter 20 .
- the operator may push the head 27 a of the fixing shaft 27 against the biasing force of the compression spring 26 , so that the fixing block 28 may be disengaged from the fixing recess 20 d . Then, the operator vertically moves the splitter 20 to a position where the fixing block 28 opposes to another fixing recess 20 d . This movement can be easily made, because no substantial clamping force is applied to the splitter 20 . Thereafter, the operator may release the pushing force applied to the fixing shaft 27 , so that the fixing block 28 engages the fixing recess 20 d by the biasing force of the spring 26 . As a result, the splitter 20 can be again fixed in position with respect to both the direction perpendicular to the thickness of the splitter 20 and the direction parallel to the surface of the splitter 20 .
- the operator In order to remove the splitter 20 , the operator also can push the head 27 a of the fixing shaft 27 for disengaging the fixing block 28 from the fixing recess 20 d . Then, the operator may simply lift the splitter 20 for disengaging the mount slot 20 c from the support shafts 23 .
- the mount flame 30 can be removed from the upper portion of the splitter 20 by upwardly pivoting the lever 41 of the mount mechanism 40 . Because the guard device 50 and the kickback preventing claw members 60 are mounted to the mount frame 30 , the guard device 50 and the kickback preventing claw members 60 can be removed from the splitter 20 together with the mount frame 30 by simply pivoting the lever 41 . Therefore, the difficulty in removing the mount frame 30 , the guard device 50 and the kickback preventing claw members 60 can be considerably reduced in comparison with the operations for removing these elements from the splitter 20 separately from each other.
- mounting the mount frame 30 to the splitter 20 also attaches the guard device 50 and the kickback preventing claw members 60 to the splitter 20 . Therefore, the difficulty in mounting the mount frame 30 , the guard device 50 and the kickback preventing claw members 60 can be considerably reduced in comparison with the operations for mounting these elements to the splitter 20 separately from each other.
- downwardly pressing the operation lever portion 51 a may enable the mount holder 51 to be removed from the tubular portion 30 T of the mount frame 30 and to eventually remove the guard device 50 from the mount frame 30 . Therefore, it is possible to remove the guard device 50 from the splitter 20 while the kickback preventing claw members 60 being held to be mounted to the splitter 20 . This may improve the operability in removing the saw blade 3 and in performing the maintenance work.
- inserting the mount holder 51 into the tubular portion 30 T of the mount frame 30 can mount the guard device 50 to the mount frame 30 . Therefore, the guard device 50 can be easily mounted to the splitter 20 . The operability in performing maintenance work on the cutting device 1 can be improved.
- the mount frame 30 can be mounted to and removed from the splitter 20 by simply vertically pivoting the lever 41 of the mount mechanism 40 , the guard device 50 and the kickback preventing claw members 60 can be easily mounted to and removed from the splitter 20 without utilizing special tools.
- the mount base 25 can be used for mounting various splitters having different thicknesses to the lift base 5 .
- the splitter 20 can be removed by simply pushing the fixing shaft 27 of the mount base 25 . Therefore, it is possible to replace the splitter 20 to change the vertical position of the splitter 20 without using special tools.
- the kickback preventing claw members 60 can be held in the upper rest position by the claw holding springs 61 .
- the kickback preventing claw members 60 can be returned from the rest position to the kickback preventing position by downwardly pivoting the kickback preventing claw members 60 after disengaging from the claw holding springs 61 . Therefore, the operability of the kickback preventing claw members 60 can be further improved.
- the kickback preventing claw members 60 In the rest position, the kickback preventing claw members 60 extend between and along the protection arms 30 . Therefore, it is possible to reliably prevent the other articles, such as hand-held tools, from being interfered by the kickback preventing claw members 60 .
- the above embodiments may be modified in various ways.
- the removal preventing stop 51 b engages the stop hole 30 g , so that the mount holder 51 is held in the mounted position, and eventually, the guard device 50 can be mounted to the mount frame 30 .
- screws may be used for removably attaching the mount holder 51 to the tubular portion 30 T of the mount frame 30 .
- the lever 51 a and the removal preventing stop 51 b may be omitted.
- mount holder 51 may be formed integrally with each other.
- One example to accomplish this is by using a molding process including synthetic resin
- tubular portion 30 T of the mount frame 30 has a rectangular cross section in the above embodiments, the tubular portion 30 T may have different cross sectional configurations, such as circular and triangular cross sections.
- the tubular portion 30 T may be replaced with a non-tubular portion, if the mount holder 51 is removably attached to the tubular portion 30 T by screws as noted previously.
- the mount mechanism 40 may be replaced with any other mount mechanisms.
- the mount frame 30 may be removably mounted to the upper proton of the splitter 20 by using bolts that clamp the splitter 20 from opposite sides with respect to the thickness direction. In such a case, the first and second slots 20 a and 20 b of the splitter 20 can be eliminated.
- mount base 25 is configured to enable the splitter 20 to be mounted and removed by the pushing and releasing operations of the fixing shaft 27
- this mounting construction can be replaced with different constructions.
- the splitter 20 may be clamped between the clamp plate 22 and the fixed base 21 by means of bolts.
- the support shafts 23 , the fixing shaft 27 and their associated parts can be eliminated.
Abstract
A cutting including a saw blade protruding from an upper surface of the table can include a splitter positioned on the front side with respect to a cutting direction of the saw blade and in alignment with the saw blade. A guard device is provided for covering the saw blade. A kickback preventing claw member prevents the workpiece from being forced upward by the saw blade after the workpiece has been cut by the saw blade. A mount frame is detachably mounted to an upper portion of the splitter. The guard device and the kickback preventing claw member are supported on the mount frame, so that the guard device and the kickback preventing claw can be removed separately or together from the splitter.
Description
- This application claims priority to Japanese patent application serial number 2005-268614, the contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to cutting devices, and in particular to table saws having a table for placing workpieces thereon and a saw blade partially protruding upward from the upper surface of the table.
- 2. Description of the Related Art
- Table saws have a table for placing workpieces thereon and a circular saw blade that partially protrudes upward from the upper surface of the table, so that workpieces may be cut by moving workpieces along the upper surface of the table toward the saw blade in a direction parallel to the surface of the saw blade. It has been known to provide a guard device in order to prevent potential interference of the other articles with the upper portion of the saw blade protruding from the table surface. The known guard device has a guard plate that is configured to cover the saw blade primarily from right and left sides and the upper side. The guard device is configured such that the guard plate is moved upward or opened by the Workpiece as the workpiece moves toward the saw blade. Typically, the guard plate is vertically pivotally mounted to a splitter.
- For the convenience of change of the saw blade, there has been proposed to configure the guard device such that the guard plate can not only vertically pivot but also can be completely removed. Japanese Laid-Open Utility Model Publication No. 646901, U.S. Pat. No. 6,405,624 and EP 1491304 A2 teach known guard devices.
- In general, a saw blade of the table saw rotates in such a direction that the saw blade moves downward on the side of the position of the workpiece before it is cut (hereinafter called “front side with respect to cutting direction”), while the saw blade moves upward on the side of the position of the workpiece after it has been cut (hereinafter called “rear side with respect to cutting direction”). Therefore, if the cut surfaces of the workpiece contact the rear side of the rotating saw blade immediately after the workpiece has been cut, the workpiece may be forced upward by the rotating saw blade in some occasion. This phenomenon is called “kickback phenomenon.” When this phenomenon occurs, it is difficult to smoothly perform the cutting operation. Therefore, there has been proposed to position a splitter (also called “riving knife”) having substantially the same thickness as the saw blade on the rear side of the saw blade and within the same plane as the saw blade. The splitter may enter the cut of the workpiece and maintain the cut width of the workpiece in order to avoid contact of the rotating saw blade with the cut surfaces. In addition, in order to prevent the potential kickback phenomenon, there has been proposed to provide kickback preventing claw members on opposite sides of the splitter within a region where the kickback preventing claw members may not interfere with the movement of the workpiece in the cutting direction. Japanese Laid-Open Utility Model Publication No. 3-42602 and U.S. Pat. No. 6,405,624 teach known kickback preventing claw members.
- Also there has been proposed to provide a splitter and kickback preventing claw members for preventing the kickback phenomenon in addition to a guard device for preventing interference of other articles with the saw blade. In this structure, a guard plate of the guard device and kickback preventing claw members are respectively vertically pivotally supported on the upper portion of the splitter.
- However, for example, in the case of the cutting operation of a decorative laminated sheet, it would be preferable that the kickback preventing claw members will not contact the sheet during the cutting operation. Therefore, by configuring the kickback preventing claw members to be able to be removed from the splitter, the operability for this kind of cutting operation can be improved. In addition, the operation for changing the saw blade can be conveniently performed if the kickback preventing claw members are removed from the splitter in order to keep the kickback preventing claw members as far away from the saw blade as possible.
- In this structure, the guard plate of the guard device and each of the kickback preventing claw members are individually supported on the splitter. In this configuration, a problem occurs such that the mounting and removing operations of the guard plate and the kickback preventing claw members are very difficult when such operations are necessary for changing the saw blade.
- One embodiment of the present invention is an improved cutting device constructed to reduce potential troubles in performing the operations for removing a guard device and a kick-back preventing claw member from a splitter.
- In another embodiment of the present invention, cutting devices are taught that include a table for placing a workpiece thereon, and a saw blade protruding from an upper surface of the table. A splitter positioned on the front side with respect to a cutting direction of the saw blade and in alignment with the saw blade. A guard device is provided for covering the saw blade. A kickback preventing claw member prevents the workpiece from being forced upward by the saw blade after the workpiece has been cut by the saw blade. A mount frame is detachably mounted to an upper portion of the splitter. The guard device and the kickback preventing claw member are supported on the mount frame, so that the guard device and the kickback preventing claw can be removed together from the splitter.
-
FIG. 1 is a side view of a table saw according to one embodiment of the present invention; -
FIG. 2 is an enlarged side view of a portion around a saw blade of the table saw; -
FIG. 3 is a plan view as viewed from a direction indicated by an arrow (3) inFIG. 2 ; -
FIG. 4 is a vertical sectional view showing the state where a mount holder of a guard device has been inserted into a mount frame; -
FIG. 5 is a vertical sectional view similar toFIG. 4 but showing the state where the mount holder is being removed from the mount frame; -
FIG. 6 is a plan view as viewed from a direction indicated by an arrow (6) inFIG. 4 ; -
FIG. 7 is a side view of the guard device after removal from the mount fame: -
FIG. 8 is a rear view of the guard device with first and second guard plates shown in vertical sectional views; -
FIG. 9 is a side view of a mount mechanism and showing the state where a mount frame has been mounted to a splitter, -
FIG. 10 is a side view similar toFIG. 9 but showing the state where the mount frame has been removed from the splitter; -
FIG. 11 is a horizontal sectional view of the mount mechanism; -
FIG. 12 is a side view of the mount mechanism and also showing kickback preventing claw members; -
FIG. 13 is a side view of the splitter and showing the state where the mount frame has been removed from the splitter; -
FIG. 14 is a vertical sectional view showing a mount base and the splitter mounted thereto; and -
FIG. 15 is a plan view showing the mount base and the splitter. - Each of the additional features and teachings disclosed above and below may be utilized separately or in conjunction with other features and teachings to provide improved cutting devices. Representative examples of the present invention, which examples utilize many of these additional features and teachings both separately and in conjunction with one another, will now be described in detail with reference to the attached drawings. This detailed description is merely intended to teach a person of skill in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims define the scope of the claimed invention. Therefore, combinations of features and steps disclosed in the following detailed description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe representative examples of the invention. Moreover, various features of the representative examples and the dependent claims may be combined in ways that are not specifically enumerated in order to provide additional useful embodiments of the present teachings.
- Various embodiments of the present invention will now be described with reference to FIGS. 1 to 15. The
FIG. 1 shows an overall view of a cutting device 1 according to one embodiment. In this embodiment, the cutting device 1 is embodied as a table saw. The cutting device 1 is characterized in a support structure for supporting kickback preventingclaw members 60 and aguard device 50. - Referring to
FIG. 1 , a table 2 is supported substantially horizontally by abase structure 10. Acircular saw blade 3 is positioned substantially centrally of the table 2 and has an upper portion extending from the upper surface of the table 2. Thesaw blade 3 is supported by alift base 5 disposed below the table 2 so as to be rotatably driven by anelectric motor 7. Thelift base 5 is slidably supported byvertical rods 6 that are mounted on thebase structure 10, so that thelift base 5 can move in parallel in the vertical direction. By vertically moving thelift base 5, it is possible to change the protruding distance of the upper portion of thesaw blade 3 from the upper surface of the table 2. In other words, it is possible to change the cutting depth of thesaw blade 3 into a workpiece W. - The workpiece W can be cut as it is moved in a direction indicated by an outline arrow (hereinafter called “cutting direction”) along the upper surface of the table 2. A
splitter 20 is disposed on the front side (left side as viewed inFIG. 1 ) of thesaw blade 3 with respect to the cutting direction. The splitter may be also called “riving knife.” - The
splitter 20 is made of a flat plate having a thickness substantially equal to the thickness of thesaw blade 3 and is positioned within the same plane as thesaw blade 3. Thesplitter 20 is mounted on abase portion 5 a of thelift base 5 via amount base 25 in such a manner that the upper portion of thesplitter 20 protrudes upward from the upper surface of the table 2. Thesplitter 20 is adapted to enter the cut just after the cut has been foxmed in the workpiece W in order to keep the cut width constant. Therefore, opposite cut surfaces are prevented from contacting with the rotatingsaw blade 3, so that a phenomenon called “kickback phenomenon” can be avoided. - The kickback preventing
claw members 60 and theguard device 50 are mounted to the upper end of thesplitter 20, which protrudes upward from the upper surface of the table 2, via amount frame 30. Themount frame 30 and theguard device 50 are shown in detail in FIGS. 2 to 9. - The
mount frame 30 includes atubular portion 30T disposed on the rear side thereof with respect to the cutting direction (left side as viewed inFIG. 2 ). Thetubular portion 30T has a rectangular cross section and includes atop part 30 a, aleft part 30 b, aright part 30 c and abottom part 30 d Thetop part 30 a, theleft part 30 b and theright part 30 c extend forwardly with respect to the cutting direction to form an invertedU-shape portion 30U. The left andright parts protection arms protection arms springs 61 are attached. The function of the claw-retainingsprings 61 will be described later. - The
guard device 50 is removably mounted to thetubular portion 30T of themount frame 30 configured as described above. Theguard device 50 in the removed state from thetubular portion 30T is shown inFIG. 7 . Theguard device 50 has amount holder 51 insertable into thetubular portion 30T, aguard frame 52 extending rearwardly with respect to the cutting direction from the mount holder 51 (rightward as viewed inFIG. 7 ), aguard holder 53 disposed at the front end of theguard frame 52, a pair of right and leftfirst guard plates 55 and a pair of right and leftsecond guard plates 56. Thefirst guard plates 55 and thesecond guard plates 56 are vertically pivotally supported by theguard holder 53 via asupport rod 54. - As shown in FIGS. 4 to 7, the
mount holder 51 has a substantially rectangular parallelepiped hollow configuration and is insertable into thetubular portion 30T without producing substantial clearance. Preferably, themount holder 51 is manufactured into one piece by a molding process of a synthetic resin. A removingoperation lever 51 a is vertically movably disposed on the upper portion of themount holder 51. The removingoperation lever 51 a is molded integrally with the upper portion of themount holder 51 while the removingoperation lever 51 a being delimited from the upper portion of themount holder 51 by a cut line. Because the removingoperation lever 51 a is made of a synthetic resin same as themount holder 51, the removingoperation lever 51 a has a resiliency in the vertical direction. When in the state where no load is applied to the removingoperation lever 51 a, the removingoperation lever 51 a is held to extend substantially flush with the upper portion of themount holder 51 as shown inFIG. 4 . When a load is applied to press the removingoperation lever 51 a downwards the removingoperation lever 51 a may pivot downward due to the resilient deformation of its base end joined to the upper portion of themount holder 51. When the pressing force has been released, the removingoperation lever 51 a resiliently recover the position to extend substantially flush with the upper portion of themount holder 51. - An
insertion preventing stop 51 c and aremoval preventing stop 51 b are formed integrally with the upper surface of the removingoperation lever 51 a. As shown inFIG. 4 , as themount holder 51 is inserted into thetubular portion 30T of themount frame 30, theinsertion preventing stop 51 c may engage with the rear end of thetop part 30 a defining the rear opening of thetubular portion 30T, so that no further inserting movement of themount holder 51 may be restricted. In addition, in this inserted position, theremoval preventing stop 51 b may enter and engages astop hole 30 b formed in thetop part 30 a of thetubular portion 30T, so that themount holder 51 may be prevented from being removed from thetubular portion 30T. In this way, it is possible to maintain the mounted state of theguard device 50 to themount frame 30. - Wen the removing
operation lever 51 a has been pressed downward, theremoval preventing stop 51 b moves downward so as to be removed from thestopper hole 30 b, so that themount holder 51 can be removed from thetubular portion 30T as shown inFIG. 5 . With themount holder 51 removed from thetubular portion 30T, it is possible to remove theguard device 50 from themount frame 30. - A
stop wall 51 d is formed on the rear end (right end as viewed inFIGS. 4 and 5 ) of themount holder 51 and extends downward therefrom. When themount holder 51 is in the mounted position shown inFIG. 4 , thestop wall 51 d substantially contacts the rear end of thebottom part 30 d of thetubular portion 30T, so that the inserting movement of themount holder 51 is restricted also by thestop wall 51 d. - The
mount holder 51 is fixedly attached to the front end of theguard fame 52. In other words, theguard frame 52 extends rearward from themount holder 51. When theguard device 50 has been mounted to themount frame 30 and eventually to thesplitter 20, theguard frame 52 is held to horizontally extend rearward from themount holder 51. - The
guard frame 52 can be formed by a single round bar that is bent to have a substantially U-shape configuration elongated along the central axis of U-shape. Opposite ends 52 a of theguard frame 52 are respectively inserted into and engaged with engagingholes 51 e formed in themount holder 51. In addition, the parallel leg portions of theguard frame 52 are respectively fitted into engagingrecesses 51 f that are formed in opposite sides of themount holder 51 and extend in forward and rearward directions. With this arrangement, theguard frame 52 is fixed in position relative to themount holder 51 in such a state that theguard frame 52 extends reward from themount holder 51. A strip plate instead of a round bar may be bent into U-shape to form theguard frame 52. - As shown in
FIGS. 2, 3 and 7, theguard holder 53 can be held by the rear end (right end as viewed inFIG. 2 ) of theguard frame 52 so as to be fixed in position relative thereto. Theguard holder 53 can include asupport shaft 54 that has opposite ends extending laterally outward from theguard holder 53. The pair of thefirst guard plates 55 and the pair of thesecond guard plates 56 are vertically pivotally supported by the opposite ends of thesupport shaft 54. Thefirst guard plates 55 are arranged symmetrically to each other. Also, thesecond guard plates 56 are arranged symmetrically to each other. The first andsecond guard plates saw blade 3 from opposite sides with respect to the lateral direction. More specifically, thesecond guard plates 56 are designed so as to lap over the respectivefirst guard plates 55 from the laterally outer side. - Stopper edges 55 a are respectively formed on the upper portions of the
first guard plates 55 in substantially the central position along the forward and rearward directions (right and left directions as viewed inFIG. 7 ) and extend toward each other. As shown inFIG. 3 , the stopper edges 55 a can contact theguard frame 52 from its upper side in order to limit the lower pivotal stroke end of thefirst guard plates 55. - Similarly, stopper edges 56 a are respectively formed on the upper portions of the
second guard plates 56 in a position nearer to their pivotal axis and extend toward each other. The stopper edges 56 a may contact the upper edges of thefirst guide plates 55 in order to limit the lower pivotal stroke end of thesecond guard plates 56 relative to thefirst guard plates 55. - In the state shown in
FIG. 2 , where theguard device 50 has been mounted to thesplitter 20 but a workpiece W still has not been set on the table 2, the stopper edges 55 a of thefirst guard plates 55 contact with theguard frame 52 from the upper side, so that thefirst guard plates 55 are positioned in the lower pivotal stroke end. In this lower pivotal stroke end, thefirst guard plates 55 do not contact the upper surface of the table 2, while the lower edges of thesecond guard plates 56 are in contact with the upper surface of the table 2. Therefore, the stopper edges 56 a of thesecond guard plates 56 are not in contact with the upper edges of thefirst guard plates 55. - As the workpiece W is moved in the cutting direction after setting on the upper surface of the table 2, the front end of the workpiece W may force to pivot the
second guard plates 56 upward. In other words, thesecond guard plates 56 are opened in order to permit movement of the work piece W. If the workpiece W has a relatively large thickness, the front end of the workpiece W may further force to pivot thefirst guard plates 55 upward to open the same. As described previously, theguard plates support shaft 54 or pivot about the same axis. - In addition, as shown in
FIGS. 7 and 8 , astopper projection 56 b and an interlocking steppedportion 56 c are formed on each of thesecond guard plates 56. When thesecond guard plates 56 have been pivoted upward by a predetermined angle, the interlocking steppedportions 56 c engage the lower edges of the respectivefirst guard plates 55. Therefore, as thesecond guard plates 56 further pivot upward by the movement of the workpiece W, thefirst guard plates 55 may pivot upward together with thesecond guard plates 56. - Further, if the operator manually pivots the
second guard plates 56 upward together with thefirst guard plates 55 by a large angle greater than the predetermined angle, thestopper projections 56 b can engage the respective leg portions of theguard frame 52 from the upper side by the resilient deformation of portion of thesecond guard plates 56 about thestopper projections 56 b. With thestopper projections 56 b thus engaged with the respective leg portions of theguard frame 52, the first andsecond guard plates FIG. 7 . - Although the
first guard plates 55 and thesecond guard plates 56 are provided in pairs in this embodiment, one first guard plate and one second guard plate can be provided, or three or more first guard plates and three or more second guard plates can be provided. - A
mount mechanism 40 can be disposed within the invertedU-shape portion 30U of themount frame 30. As described previously, the U-shape portion 40U is positioned substantially centrally of themount frame 30 with respect to the forward and rearward directions. The details of themount mechanism 40 are shown in FIGS. 9 to 11. Themount mechanism 40 has alever 41 that can be pivoted by the operator. Thelever 41 is pivotally supported by a fixedshaft 42 that extends between theleft part 30 b and theright part 30 c of themount frame 30. The upper portion of thelever 41 extends upward through and beyond thetop part 30 a of themount frame 30. In this embodiment,lever 41 is vertically pivotally supported by fixedshaft 42. - Also, a
front engaging roller 47 is rotatably supported by the fixedshaft 42. Apivotal shaft 43 can be mounted to thelever 41 in a position away from its pivotal axis, so that thepivotal shaft 43 can be positioned away from the fixedshaft 42 by a predetermined distance. An intermediate engagingroller 48 can be rotatably supported by thepivotal shaft 43. One end of anarm 44 is vertically pivotally supported by thepivotal shaft 43. Ashiftable shaft 45 can be attached to the other end of thearm 44. Arear engaging roller 46 is rotatably supported by theshiftable shaft 45. - Opposite ends of the
shiftable shaft 45 are slidably inserted intocontrol slots left part 30 b and theright part 30 c of themount frame 30. Thecontrol slots shiftable shaft 45 can move together with rear engagingroller 46 in parallel in forward and rearward directions (left and right directions as viewed in FIGS. 9 to 11) along thecontrol slots FIG. 10 , the fixedshaft 42 is positioned within a plane J, within includes the longitudinal axes of thecontrol slots - Therefore, as the
lever 41 pivots upward about the fixedshaft 42, thearm 44 pivots in a clockwise direction as viewed inFIG. 10 about thepivot shaft 43, so that theshiftable shaft 45 moves forward together with therear engaging roller 46 along thecontrol slots rear engaging roller 46 moves toward the front engagingroller 47. - On the contrary, as the
lever 41 pivots downward about the fixedshaft 42, the arm pivots in a counterclockwise direction as shown inFIG. 9 , so that therear engaging roller 46 moves away from the front engagingroller 47. In addition, the intermediate engagingroller 48 moves downward to interleave between the front engagingroller 47 and therear engaging roller 46 and may force therear engaging roller 46 to move the same rearward. As thelever 41 is further pivoted downward, thepivotal shaft 43 supporting the intermediate engagingroller 48 moves across the plane J from a position above the plane J to a position slightly below the plane J. Then, therear engaging roller 46 may be temporarily locked in a position that is away from the front engagingroller 47. The position of thelever 41 in this state will be hereinafter called “lock position.” In this way, the plane J defines a dead point of the lock mechanism constituted by three engagingrollers rollers lever 41 will be explained later. - Forcibly pivoting the
lever 41 upward from the lock position may move thepivotal shaft 43 from the position below the plane J to a position above the plane J, so that the lock condition may be released and therear engaging roller 46 can move toward the front engagingroller 47. - As shown in
FIG. 11 , a circumferential engagingrecess 47 a and a circumferential engagingrecess 46 a are respectively formed in the outer circumferential surfaces of the front engagingroller 47 and therear engaging roller 46 throughout their circumferential lengths. Preferably, each of the engagingrecesses splitter 20. Acircumferential engaging projection 48 a engageable with thecircumferential recess 46 a of therear engaging roller 46 can be formed on the outer circumferential surface of the intermediate engagingroller 48. Preferably, the engagingprojection 48 a has a width that is substantially equal to the thickness of thesplitter 20. - For cooperating with the
mount mechanism 40 configured as described above, afirst slot 20 a and asecond slot 20 b can be formed in the upper portion of thesplitter 20. Thefirst slot 20 a extends into thesplitter 20 from the upper edge of thesplitter 20 as shown inFIG. 20 , so that thefirst slot 20 a has an upper opening having a width L1 with respect to forward and rearward directions. Thesecond slot 20 b is formed in continuity with the lower portion of thefirst slot 20 a and is elongated in forward and rearward directions, so that thesecond slot 20 b has a width L2 that is greater than the width L1 (L2>L1). - As the
lever 41 is pivoted upward to move therear engaging roller 46 toward the front engagingroller 47, the distance between the front side portion of the front engagingroller 47 and the rear side portion of therear engaging roller 46 may be reduced to be smaller than the width L1. Therefore, with the distance thus reduced, the front and rear engagingrollers first slot 20 a of thesplitter 20 and further enter thesecond slot 20 b. Then, the operator may pivot thelever 41 downward to move therear engaging roller 46 away from the front engagingroller 47, so that therear engaging roller 46 engages the rear end of thesecond slot 20 b and the front engagingroller 47 engages the front end of thesecond slot 20 b. As thelever 41 is further pivoted downward to the lock position, the intermediate engagingroller 48 presses the front and rear engagingrollers splitter 20, which define front and rear ends of thesecond slot 20 b. As a result, themount mechanism 40 can be held to be mounted to thesplitter 20. - More specifically, in this lock condition, the distance between the front side portion of the front engaging
roller 47 and the rear side portion of therear engaging roller 46 is greater than the width L1 of thefirst slot 20 a. Therefore, these engagingrollers first slot 20 a. In addition, portions of thesplitter 20 defining the front and rear ends of thesecond slot 20 b engages the engagingrecesses rollers projection 48 a of the intermediate engagingroller 48 contacts the engagingrecess 46 a of therear engaging roller 46 to thereby press therear engaging roller 47 against the portion of thesplitter 20 defining the rear end of thesecond slot 20 b and to press the front engagingroller 47 against the portion of thesplitter 20 defining the front end of thesecond slot 20 b by a reaction force. As the front and rear engagingrollers splitter 20 defining the front and rear ends of thesecond slot 20 b, the engagingrecesses rollers splitter 20 defining the front and rear ends of thesecond slot 20 b. Therefore, the front and rear engagingrollers splitter 20 with respect to the direction parallel to the surface of thesplitter 20 and also with respect to the direction substantially perpendicular to the surface of thesplitter 20. This may reliably hold the mounted state of themount frame 30 and eventually the mounted state of theguard device 50 and the kickback preventingclaw members 60 to thesplitter 20. - In order to remove the
mount mechanism 40 from thesplitter 20, the operator may pivot thelever 41 upward to move therear engaging roller 46 toward the front engagingroller 47 until the distance between the front side portion of the front engagingroller 47 and the rear side portion of therear engaging roller 46 becomes smaller than the width L1. Then, the front and rear engagingrollers second slot 20 b to thefirst slot 20 a and further to the outside of thesplitter 20. Therefore, themount mechanism 40 can be removed from thesplitter 20. Removing themount mechanism 40 from thesplitter 20 can also result in the removal of themount frame 30,guard device 50 and the kickback preventingclaw members 60 from thesplitter 20. - In this way, the
mount mechanism 40 enables themount frame 30, theguard device 50 and the kickback preventingclaw members 60 to be reliably mounted to and removed from thesplitter 20 by a simple vertical pivoting operation of thelever 41. - As shown in
FIG. 11 , twobushes 49 are rotatably supported on the fixedshaft 42 of themount mechanism 40. The front engagingroller 47 is positioned between these twobushes 49. Thus, the kickback preventingclaw members 60 can be vertically pivotally supported by the fixedshaft 42 via therespective bushes 49. Torsion springs 62 are fitted on therespective bushes 49. One end of eachtorsion spring 62 engages thetop part 30 a of themount frame 30 and the other end of eachtorsion spring 62 engages the corresponding kickback preventingclaw member 60 from its upper side. Therefore, the torsion springs 62 serve to normally urge the kickback preventingclaw members 60 downward. - The kickback preventing
claw members 60 can be disposed on laterally opposite sides of thesaw blade 3 and each can includeclaws 60 a at its lower side as shown inFIG. 12 for engaging the workpiece W. With the workpiece W pressed downward against the surface of the table 2 by theclaws 60 a of the kickback preventingclaw members 60, the workpiece W may be prevented from being accidentally lifted due to the kickback phenomenon that may be caused by the force applied to the workpiece W by the rotatingsaw blade 3.Claws 60 a can include other configurations as long as it provides favorable interaction with the workpiece W. - As described previously, the left and
right protection arms right side parts U-shaped portion 30U of themount frame 30. As shown inFIG. 3 , two claw holding springs 61 can be mounted between the front ends of theprotection arms - By engaging the front ends of the kickback preventing
claw members 60 with the claw holding springs 61 after pivoting the kickback preventingclaw members 60 upward against the biasing forces of the torsion springs 62, it is possible to hold the kickback preventingclaw members 60 at an upward rest position. At the rest position, the kickback preventingclaw members 60 are positioned to extend substantially along therespective protection arms claw members 60 can be covered by therespective protection arms claw members 60. - As described previously, the
splitter 20 can be mounted on thebase portion 5 a of thelift base 5 via themount base 25. Thebase portion 5 a extends forwardly from thelift base 5 as shown inFIG. 1 . The details of themount base 25 are shown inFIGS. 13 and 14 . Themount base 25 can include a fixedbase 21 and aclamp plate 22. The fixedbase 21 is fixedly mounted on thebase portion 5 a of thelift base 5 viabolts 21 a. Theclamp plate 22 is adapted to clamp the lower portion of thesplitter 20 in the direction of its thickness against the fixedbase 21. - Upper and
lower support shafts 23 extend between the fixedbase 21 and theclamp plate 22. Thesupport shafts 23 have stepped portions for engaging theclamp plate 22.Nuts 23 b engage with thesupport shafts 23 from the side opposite to the stepped portions with respect to theclamp plate 22, so that thesupport shafts 23 are fixed in position by the tightening forces applied to the nuts 23 b. Compression springs 24 are interposed betweenheads 23 a of thesupport shafts 23 and the fixedbase 21, so that the compression springs 24 bias theclamp plate 22 in a direction toward the fixedbase 21 or the direction for clamping thesplitter 20. A fixingscrew 29 fixes one of thesupport shafts 23 in position relative to theclamp plate 22, so that theclamp plate 22 can be fixed in position relative to the fixedbase 21. - As shown in FIGS. 12 to 14, an
elongated mount slot 20 c can be formed in the lower portion of thesplitter 20 and is opened at the lower edge of thesplitter 20. Preferably, themount slot 20 c extends along an arc about the rotational axis of thesaw blade 3. Thesupport shafts 23 are inserted into themount slot 20 c. - As shown in
FIG. 13 , a plurality of substantiallysemicircular recesses 20 d can be formed in the front edge of thesplitter 20. Twosemicircular recesses 20 d can be included in this embodiment. The fixedbase 21 has a fixingshaft 27 that extends throughout the thickness of the fixedbase 21. Acompression spring 26 is interposed between a head 27 a of the fixingshaft 27 and the fixedbase 21 in order to bias the fixingshaft 27 in the right direction as viewed inFIG. 14 . A fixingblock 28 having a substantially truncated conical configuration is attached to the left end of the fixingshaft 27 and is engageable with any one of thesemicircular recesses 20 d in order to fix thesplitter 20 in position relative to themount base 25 through cooperation with thesupport shafts 23. - The clearance between the
clamp plate 22 and the fixedbase 21 can be adjusted by the following process. First, the fixingscrew 29 is loosened; so that theclamp plate 22 is biased toward the fixedbase 21 by the compression springs 24. Theclamp plate 22 therefore contacts with the fixedbase 21. Then, thesplitter 20 is inserted between theclamp plate 22 and the fixedbase 21 from the upper side. In order to facilitate the inserting operation, anupper corner portion 21 a of the fixedbase 21 and anupper corner portion 22 a of theclamp plate 22, which can be oppose to each other, are chamfered. Therefore, so that thesplitter 20 can be wedged between the fixedbase 21 and theclamp plate 22 under the guide of the chamferedupper corner portions base 21 and theclamp plate 22 can be spaced from each other by the distance corresponding to the thickness of thesplitter 20. Then, the fixingscrew 29 is tightened to fix theclamp plate 22 in position relative to the fixedbase 21, so that the clearance between the fixedbase 21 and theclamp plate 22 may be maintained. In this state, thesupport shaft 23 that is disposed on the lower side as viewed inFIG. 14 is not fixed in position relative to the fixedbase 21. However, thecompression spring 24 associated with thelower support shaft 23 does not act to move theclamp plate 22, because the fixedbase 21 and theclamp plate 22 are fixed in position by the fixingscrew 29 associated with theupper support shaft 23. - Because the clearance between the
clamp plate 22 and the fixedbase 21 can be set and fixed to correspond to the thickness of thesplitter 20 to be used, potential movement in the direction of thickness of thesplitter 20 is reduced while the adjustment of vertical position of thesplitter 20 along themount slot 20 c may be possible. The same setting process can be applied to different splitters having different thicknesses. - In order to set the
splitter 20, the operator can insert the lower portion of thesplitter 20 into the clearance between theclamp plate 22 and the fixedbase 21 such that thesupport shafts 23 enter themount slot 20 c. When thesplitter 20 has been moved in such a position that any one of the fixingrecess 20 d of thesplitter 20 opposes the fixingblock 28 of the fixingshaft 27, the fixingblock 28 can engage with the fixingrecess 20 d due to the biasing force of thecompression spring 26. As a result, thesplitter 20 can be fixed in position with respect to both the direction perpendicular to the thickness of thesplitter 20 and the direction parallel to the surface of thesplitter 20. - In order to change the vertical position of the
splitter 20, the operator may push thehead 27 a of the fixingshaft 27 against the biasing force of thecompression spring 26, so that the fixingblock 28 may be disengaged from the fixingrecess 20 d. Then, the operator vertically moves thesplitter 20 to a position where the fixingblock 28 opposes to another fixingrecess 20 d. This movement can be easily made, because no substantial clamping force is applied to thesplitter 20. Thereafter, the operator may release the pushing force applied to the fixingshaft 27, so that the fixingblock 28 engages the fixingrecess 20 d by the biasing force of thespring 26. As a result, thesplitter 20 can be again fixed in position with respect to both the direction perpendicular to the thickness of thesplitter 20 and the direction parallel to the surface of thesplitter 20. - In order to remove the
splitter 20, the operator also can push thehead 27 a of the fixingshaft 27 for disengaging the fixingblock 28 from the fixingrecess 20 d. Then, the operator may simply lift thesplitter 20 for disengaging themount slot 20 c from thesupport shafts 23. - According to the one embodiment of the present invention as described above, the
mount flame 30 can be removed from the upper portion of thesplitter 20 by upwardly pivoting thelever 41 of themount mechanism 40. Because theguard device 50 and the kickback preventingclaw members 60 are mounted to themount frame 30, theguard device 50 and the kickback preventingclaw members 60 can be removed from thesplitter 20 together with themount frame 30 by simply pivoting thelever 41. Therefore, the difficulty in removing themount frame 30, theguard device 50 and the kickback preventingclaw members 60 can be considerably reduced in comparison with the operations for removing these elements from thesplitter 20 separately from each other. - In addition, mounting the
mount frame 30 to thesplitter 20 also attaches theguard device 50 and the kickback preventingclaw members 60 to thesplitter 20. Therefore, the difficulty in mounting themount frame 30, theguard device 50 and the kickback preventingclaw members 60 can be considerably reduced in comparison with the operations for mounting these elements to thesplitter 20 separately from each other. - Further, downwardly pressing the
operation lever portion 51 a may enable themount holder 51 to be removed from thetubular portion 30T of themount frame 30 and to eventually remove theguard device 50 from themount frame 30. Therefore, it is possible to remove theguard device 50 from thesplitter 20 while the kickback preventingclaw members 60 being held to be mounted to thesplitter 20. This may improve the operability in removing thesaw blade 3 and in performing the maintenance work. On the contrary, inserting themount holder 51 into thetubular portion 30T of themount frame 30 can mount theguard device 50 to themount frame 30. Therefore, theguard device 50 can be easily mounted to thesplitter 20. The operability in performing maintenance work on the cutting device 1 can be improved. - Furthermore, because the
mount frame 30 can be mounted to and removed from thesplitter 20 by simply vertically pivoting thelever 41 of themount mechanism 40, theguard device 50 and the kickback preventingclaw members 60 can be easily mounted to and removed from thesplitter 20 without utilizing special tools. - Still furthermore, the
mount base 25 can be used for mounting various splitters having different thicknesses to thelift base 5. Additionally, thesplitter 20 can be removed by simply pushing the fixingshaft 27 of themount base 25. Therefore, it is possible to replace thesplitter 20 to change the vertical position of thesplitter 20 without using special tools. - Furthermore, the kickback preventing
claw members 60 can be held in the upper rest position by the claw holding springs 61. The kickback preventingclaw members 60 can be returned from the rest position to the kickback preventing position by downwardly pivoting the kickback preventingclaw members 60 after disengaging from the claw holding springs 61. Therefore, the operability of the kickback preventingclaw members 60 can be further improved. - In the rest position, the kickback preventing
claw members 60 extend between and along theprotection arms 30. Therefore, it is possible to reliably prevent the other articles, such as hand-held tools, from being interfered by the kickback preventingclaw members 60. - The above embodiments may be modified in various ways. For example, when the
mount holder 51 is inserted into thetubular portion 30T of themount frame 30, theremoval preventing stop 51 b engages thestop hole 30 g, so that themount holder 51 is held in the mounted position, and eventually, theguard device 50 can be mounted to themount frame 30. However, screws may be used for removably attaching themount holder 51 to thetubular portion 30T of themount frame 30. In such a case, thelever 51 a and theremoval preventing stop 51 b may be omitted. - Additionally, the
mount holder 51, theguard frame 52 and theguard holder 53 may be formed integrally with each other. One example to accomplish this is by using a molding process including synthetic resin - Although the
tubular portion 30T of themount frame 30 has a rectangular cross section in the above embodiments, thetubular portion 30T may have different cross sectional configurations, such as circular and triangular cross sections. In addition, thetubular portion 30T may be replaced with a non-tubular portion, if themount holder 51 is removably attached to thetubular portion 30T by screws as noted previously. - The
mount mechanism 40 may be replaced with any other mount mechanisms. For example, themount frame 30 may be removably mounted to the upper proton of thesplitter 20 by using bolts that clamp thesplitter 20 from opposite sides with respect to the thickness direction. In such a case, the first andsecond slots splitter 20 can be eliminated. - Further, although the
mount base 25 is configured to enable thesplitter 20 to be mounted and removed by the pushing and releasing operations of the fixingshaft 27, this mounting construction can be replaced with different constructions. For example, thesplitter 20 may be clamped between theclamp plate 22 and the fixedbase 21 by means of bolts. In such a case, thesupport shafts 23, the fixingshaft 27 and their associated parts can be eliminated.
Claims (18)
1. A cutting device comprising:
a table for placing a workpiece thereon;
a saw blade protruding from an upper surface of the table;
a splitter positioned in alignment with the saw blade;
a guard device arranged and constructed to cover the saw blade;
a kickback preventing claw member arranged and constructed to prevent the workpiece from being forced upward by the saw blade after the workpiece has been cut by the saw blade; and
a mount frame detachably mounted to an upper portion of the splitter;
wherein the guard device and the kickback preventing claw member are supported on the mount fame, so that the guard device and the kickback preventing claw member can be removed from the splitter.
2. The cutting device as in claim 1 , wherein the guard device capable of being removed separately from the mount frame.
3. The cutting device as in claim 2 , wherein:
the mount frame comprises a tubular portion with an opening on a rear side with respect to the cutting direction, further wherein the guard device comprises a mount holder removably insertable into the tubular portion, a guard frame extending rearward from the mount holder with respect to the cutting direction, a guard holder disposed at one end of the guard frame, and a guard plate vertically pivotally supported on the guard holder.
4. The cutting device as in claim 1 , wherein:
the splitter includes a first slot starting from an upper edge of the splitter and having a first width, and a second slot formed in continuity with the first slot and having a second width greater than the first width, further wherein
the mount frame includes a mount mechanism for mounting the mount frame to an upper portion of the splitter;
the mount mechanism comprises:
a lever vertically pivotally supported by the mount frame via a fixed shaft;
an arm having a first end and a second end, wherein the first end is pivotally joined to the lever;
a shiftable shaft coupled to the second end of the arm and movably supported by the mount frame, so that the shiftable shaft moves in forward and rearward directions as the arm pivots by the vertical pivotal operation of the lever,
a first engaging roller rotatably supported on the fixed shaft;
a second engaging roller rotatably supported on the shiftable shaft, so that the second engaging roller moves toward and away from the first engaging roller as the lever is pivoted between a first position and a second position;
wherein the first and second engaging rollers are spaced from each other by a first distance when the lever has been pivoted to the first position; and
wherein the first and second engaging rollers are spaced from each other by a second distance when the lever has been pivoted to the second position;
the first distance permitting the first and second engaging rollers to move into and out of the second slot via the first slot of the splitter when the lever has been pivoted to the first position; and
the second distance enabling engagement of the first and second rollers with opposite ends of the second slot of the splitter when the lever has been pivoted to the second position,
while the second distance preventing the first and second engaging rollers from moving from the second slot to the first slot.
5. The cutting device as in claim 1 , further comprising:
a lift base supporting the saw blade and vertically movable relative to the table;
wherein the splitter is mounted to the lift base via a mount base, so that the splitter can move vertically together with the saw blade;
wherein the mount base comprises:
a fixed base fixedly mounted to the lift base,
a clamp plate arranged and constructed to clamp the splitter against the fixed base; and
a biasing member arranged and constructed to bias the clamp plate toward the fixed base.
6. The cutting device as in claim 1 ,
wherein the kickback preventing claw member is vertically pivotally supported by the mount frame and is pivotable between a lower kickback preventing position and an upper rest position,
wherein the cutting device further comprises a claw holding spring for resiliently holding the kickback preventing claw member at the upper rest position.
7. The cutting device as in claim 6 ,
wherein the mount frame comprises a pair of parallel protection arms extending forwardly from the mount frame with respect to the cutting direction, and
wherein the claw holding spring is disposed between the protection arms, so that the kickback preventing claw member extends along and between the protection arms when the kickback preventing claw member is positioned in the upper rest position.
8. A cutting device comprising:
a table for placing a workpiece thereon;
a circular saw blade partially protruding upward from an upper surface of the table;
a splitter arranged and constructed to enter a cut formed in the workpiece by the saw blade in order to prevent interference between the saw blade and the workpiece at the cut;
a saw blade guard arranged and constructed to cover the saw blade;
a workpiece holding member arranged and constructed to hold the workpiece against the upper surface of the table in order to prevent the workpiece from being move at least in one direction a mount member;
a first mount mechanism detachably mounting the mount member to the splitter;
a second mount mechanism mounting the saw blade guard to the mount member;
a third mount mechanism mounting the workpiece holding member to the mount member.
9. The cutting device as in claim 8 , wherein the second mount mechanism detachably mounts the saw blade guard to the mount member.
10. The cutting device as in claim 9 , wherein the second mount mechanism comprises a mount holder detachably mounted to the mount member, and wherein the saw blade guard is vertically pivotally mounted to the mount holder.
11. The cutting device as in claim 10 , wherein the saw blade guard comprises a first guard and a second guard individually pivotally mounted to the mount holder between a covering position for covering the saw blade and an uncovering position for uncovering the saw blade, wherein the first guard and the second guard are moved by the workpiece from the covering position to the uncovering position at different timing from each other as the workpiece moves along the table surface toward the saw blade for the cutting operation.
12. The cutting device as in claim 11 , further comprising a first holding device for releasably holding the first and the second guards in the uncovering position.
13. The cutting device as in claim 8 , wherein the third mounting mechanism vertically pivotally mounts the holding member to the mount member, so that the holding member can move between a holding position for holding the workpiece against the table surface and a rest position away from the holding position.
14. The cutting device as in claim 13 , further comprising a second holding device for releasably holding the holding member in the rest position.
15. The cutting device as in claim 14 , wherein the mount member comprises a protection member mounted to the mount member for preventing the holding member from interference with the other elements when the holding member is in the rest position.
16. The cutting device as in claim 8 , wherein
the first mount mechanism comprises a slot formed in the splitter and an engaging device releasably engageable with the slot in order to fix the mount member in position relative to the splitter.
17. The cutting device as in claim 16 , wherein the engaging device comprises:
a first engaging member and a second engaging member attached to the mount member,
wherein at least one of the first and second engaging members is movable relative to the mount member;
an operation member movable between a first position and a second position and provided to move the at least one of the first and second engaging members;
wherein the first and second engaging members are spaced from each other by a first distance, so that the first and second engaging members can be inserted into and removed from the slot of the splitter when the operation member is operated to the first position,
wherein the first and second engaging members are spaced from each other by a second distance, so that the first and second engaging members positioned in the slot of the splitter is fixed when the operation member is moved to the second position;
18. The cutting device as in claim 17 , further comprising a lock device for the operation member and operable to fix the second distance between the first and second engaging members when the operation member is in the second position.
Priority Applications (1)
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JP2005-268614 | 2005-09-15 |
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US7600456B2 (en) * | 2005-11-21 | 2009-10-13 | Robert Bosch Gmbh | Modular guard system for a power saw |
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US20090056514A1 (en) * | 2007-08-31 | 2009-03-05 | Rexon Industrial Corp., Ltd. | Quick release device for a saw blade guard assembly of a circular saw |
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US20180345522A1 (en) * | 2011-02-17 | 2018-12-06 | Sawstop Holding Llc | Blade guard for a table saw |
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Also Published As
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US20090158906A1 (en) | 2009-06-25 |
US7698978B2 (en) | 2010-04-20 |
JP2007076235A (en) | 2007-03-29 |
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Legal Events
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AS | Assignment |
Owner name: MAKITA CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHIBATA, YOSHINORI;REEL/FRAME:018391/0660 Effective date: 20060915 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |