US2013122A - Grinding machine - Google Patents

Description

7 Sheets-Sheet 1 lllll Nl. H. ARMS GRINDING MACHINE Flled Nov 8, 1932 GRINDING- MACHINE Filed Nov. 8, 1952 7 Sheets-Sheet 2 s M R A H. M

GRINDING MACHINE Filed Nov. 8, .1932 7 Sheets-Sheet 5 7 Sheets-Sheet 4 s M R A H. M.

GRINDING MACHINE Filed NOV. 8, 1952 M. H. ARMS GRINDING MACHINE Filed Nov. 8, 1932 7 SheefSSheet 6 mmm em. 3 l3 M- H ARMS GRINDING MACHINE Filed Nov. 8, 1952 7 Sheets-Sheet 7 to show the working parts within.

tools.

Patented Sept. 3i, 1935 Unire stares altari PATENT OFM@ ApplicaticnNoi/'ember 8, 1932, Serial No. 641,733

24 Claims.

This invention relates to a multiple spindle grinding machine or the like having work-holders mounted in a turret for simultaneous presentation of a plurality of pieces of work to the several The embodiment of the invention hereinafter described includes tool carriages with improved mountings for feeding the tools laterally against the work, improved mechanism for reciprocating the tools to and from the work, and a truing device for each tool automatically moving into and out f operative position as the carriages withdraw the tools from the work or advance them thereto.

Vario-us other novel and advantageous features and combinations will be apparent to one skilled' in the art from the disclosure of the invention in the embodiment thereof hereinafter described and illustrated on the drawings, of which,-

Figure l is a side elevation of a grinding machine embodying the invention.

Figure 2 is a plan View of the same with the lid of the turret removed.

Figure 3 is a iront elevation of the same, a por-- tion being cut away to show parts in section.

Figure 4 is a section on the line 4`4 of Figure 3.

Figure 5 is a fragmentary section on the line 5-5 of Figure 4l. Y

Figure 6 is a section on the line 6--6 of Figure 3. Y

Figure '7 is a section on the line i--T of Figure 6.

Figure 8 is a section on the line 8-8 of Figure '7.

Figure 9 is a plan View of a modified form of the invention.

Figure l0 is a fragmentary elevation of the same, a portion of the casing being broken away Figure ll is a wiring diagram for the motors for driving the work-holders, illustrated in Figure l0.

The invention may be embodied in a machine including a bed casting 2t having a number of wings 2i extending laterally therefrom. On the body portion of the bed is mounted a turret 22 to rotate on a vertical axis. The turret and wings carry work-holders and tools in such a way that when the turret is in any one of its indexed positions, the tools can be presented to pieces of work carried by work-holders adjacent to the respective tools, In the embodiment of the invention illustrated on the drawings, the work-holders are shown as radially arranged on the turret, they tools being mounted on the Wings of the bed in line with certain of the work-holders when the turret is in any one of its indexed positions. Four work-holders are shown, these being arranged at right angles to each other. Three tools are interior working aligned respectively with three `of the work-holders, the fourth workholder being at a loading station in front of the machine. The invention, however, is not 'limited toV these particular numbers of Work-holders or tools. For the support of the work-holders, the turret 22 is provided with a series of radially extending arms 23. Within each arm Z3 is fixed a hollow sleeve A shaft 3i extends through this sleeve and is mounted therein on suitable ball bearings for rotation on a horizontal axis. Mountedon the outer end portionof the shaft 3l is a suitable chuck 32 which is adapted to hold a piece of work W.

In the embodiment illustrated in the drawings the work is shown as a cylindrical collar or bushing to be finished o-n its interior surface. Suitable clamps 33 may be employed to hold the work solidly in position in the chuck 32. The inner end of the shaft 3i' projects into the interior of the turret 22. Suitable mechanism is provided for rotating the chuck 32. For this purpose a lcommon drive may be employed, or the chucks may be independently driven. As shown in Figures 2 and 3, for example, the several chucks may be driven by a single motor. For this type of drive, a miter gear wheel 35 is loosely mounted on the inner` end portion oi each shaft Si. Fixed to a face of the gear wheel 35 is a ring 36 having' a conical friction surface il on its rim.` This surface is engageable by a complemental friction surface of a clutch member lil which is splined to a reduced end portion il of the shaft 3l. The inner end of the shaft is drilled axially to hold a suitable spring @l2 which normally pressesthe friction face of the clutch member 4U into driving engagement with the friction face 3l of the ring 36. Thus the gear Wheel 35. is usually connected to the shaft 3i through the clutch member do. The gear wheels 35 of the several shafts 3i are all in mesh with a horizontal gear wheel ifthis gear being mounted on a Vertical quill' it on which is also mounted' a suitable pulley di. This pulley is preferably rotated constantly during the operation of the entire` apparatus, a suitable driving means such as' an electric" motor 563 being operatively connected with the' pulley il as by one or more belts 5f. The quill t6 rotates about a ixed shaft or post 52, this post being anchored at its lower end in the bed' il. The turret 22 has a downwardly extending tubular projection 555 which surrounds the` quill t6 and is separated therefrom by suitable ball bearings so that the quill and turret are both freely rotatable with respect to each other. It is desirableV that the rotation oi" each chuck shaft 3i' be stopped when the arm 23 containing it reaches work-loading position in which the arm and shaft extend forwardly of the apparatus. To this end a suitable cam lug til" is mounted on the fixed vertical shaft 52'.

When the turret 22 revolves so as to move one of the arms 23 from the last operating station to the loading station, the clutch member 48 corresponding toY this arm 23 moves into engagement with the fixed cam lug 60. This causes the clutch member 40 to move radially outward against pressure of its spring 42, disengagng its friction face from the frictional surface 31 of the ring 36. Thus the constantly turned gear wheel 35 is disconnected from its shaft 3| as long as the corresponding arm 23 remains in the loading position. As soon as this arm is swung by indexing movement of the turret 22 from the loading position to the first operating position, the clutch member 48 moves out of engagement with the cam lug 60 and thereupon connects the corresponding gear wheel 35 and shaft 3| for rotation of the latter.

Mechanism for indexing the turret 22 is illustrated in Figures 3 and 6. For this purpose a suitable motor 65 is connected through gears 66 and S7 to a shaft |58. Mounted on this shaft is a pinion 'IIJ which meshes with a pinion 'II loosely mounted on a shaft II2. Mounted on the shaft l2 is one member 'I3 of a clutch, the other member 'I4 being formed on or rotatable with the pinion 1|. An end portion of the shaft 'I2 projects through the hub of the pinion 'II and carries a spring 'i5 which tends to hold the clutch member 'i3 in engagement with the clutch member 14. The opposite end of the shaft 'I2 rests against a suitable end bearing 88 which, as shown, may be carried by a sliding carriage 8|, the latter being slidable in the direction of the axis of the shaft 'I2 to permit the clutch member 'F3 to move clear of the clutch member M. A stiff spring 82 is provided to press the shaft 'I2 axially to a position in which the clutch members 'I3 and 'I4 are engaged so that the shaft may be driven. Mounted on the shaft I2 for rotation therewith is a suitable worm 83 which meshes with a worm gear 84, the latter being fixed on a vertical shaft 85. As shown in Figure 3, the shaft 85 carries a pinion SEI fixed at the upper end thereof, this pinion meshing with a ring gear 9| secured to the turret 22. Thus rotation of the gear wheel S4 results in indexing movement of the turret 22. Stops for limiting the indexing movement of the turret are provided in the form of stop pins 95, one of these pins being mounted on the under side of each of the arms 23, as shown in Figures 2 and 3. A stop rod S8 is vertically slidable in the bed 2|) and is arranged so that its upper end portion is normally in the path of movement of the stop pin 95 when the turret is rotated on its axis. Indexing movement of the turret, as illustrated in Figure 2, is in a counterclockwise direction, hence the gear wheel 84 is driven in a clockwise direction by rotation of the worm 83. Indexing movement of the turret brings one of the stop pins 85 into engagement with the upper end of the stop rod 95 which is in its path of motion. This prevents further rotation of the turret or of the gear wheel 84. The worm 83, however, continues to rotate with the shaft 'I2 and is compelled to travel axially, or tangent to the stationary gear wheel 8d. As a result the shaft I2 is also moved axially until the clutch element 'I3 is moved out of engagement with the clutch element l'fi, this axial movement of the shaft being against the pressure of the springs 82 and 15. Thus the shaft 12 disconnects itself from the pinion "II, the spring 82 thereupon acting to hold the turret firmly in its indexed position with one of the stop pins 95 against the upper end portion of the stop rod 96.

Means for moving the stop rod 9E into and out of operative position are illustrated in Figures 3 and 6. A spring is provided to react against a collar IEiI mounted on the stop rod, in a direction to press the rod downwardly out of operative position. Fixed to the rod Q6 is a second collar |52, the under face of which is engaged by a pair of arms |55 mounted on a cross shaft ISS which is rockably mounted in suitable bearings |01 and carries a crank arm IIS. A thrust rod |I| bears at one end against the crank arm II, the opposite end of the thrust rod IIi riding on the edge of a cam I I2. This cam has a recess I|3. The cam disk I|2 may be mounted on a shaft H4 with a gear wheel H5 which is driven by a worm IIS mounted on the shaft E58. When the end of the rod II I rides into the recess I i3 of the cam I i2, the rod is moved toward the left by the spring |80 acting through the shaft |08 and the crank arm IIB, releasing the stop rod 96. When the end of the rod III rides out of the recess III-3, the rod is pushed toward the right, raising the stop rod 96 into operative position against the pressure of the spring I Mi. When the turret is stationary, one of the stop pins Q is strongly pressed against the stop rod 96 by the spring 82, so that the rod 98 may be frictionally held in locking position even when released from below. It is desirable to relieve this pressure to permit the stop rod to move clear of the pin with which it is engaged. To this end a vertical shaft |20 is provided with an eccentric member I2I bearing against an end of the worm 83. If the shaft |28 is rocked in a counterclockwise direction, the eccentric member I2I will press against the worm 83 .and this will result in an axial movement of the shaft "i2 toward the end bearing 88. Such axial movement of the shaft will result in a counterclockwise movement of the gear wheel 84 and hence in a clockwise` movement of the turret 22 sufficient to relieve the pressure between the stop rod 95 and the stop pin 95 in contact therewith. Rocking movement of the shaft |28 may be obtained by means of a lever arm |22 mounted thereon. A pin |23 is mounted near the end of this arm and is engageable by a pin |24 mounted on the cam member I I2. The position of the pin |24 is so related to the recess |I3 that the pin |22 comes into engagement with the pin |23 so as to rock the arm |22 and relieve the pressure of the stop rod 96 against a pin 95 just after the rod Iii rides into the recess II3 of the cam member H2 to release the rod S5. Thus when the pin E25 clears the pin |23, releasing the arm 222 and hence the shaft "i2, the latter moves axially under the inuence of the spring 82 so as to connect the clutch members 'I3 and 'lll for the resumption of rotation of the shaft i2. This causes indexing movement of the turret until the next succeeding pin 95 is stopped by engagement with the upper end of the stop rod Q5 which has meanwhile been raised as the rod I I I rides out of the recess II3. This brings into alignment with the tools three of the arms 23 which carry the several pieces of work, the fourth arm 23 being at the loading station.

For the grinding away of portions of the work, the tools must be suitably fed against the surfaces to be ground. According to the present invention, such feeding movement is obtained by relative movement between the work and the tool in a substantially vertical direction, that is,

cof

surface of the wo-rk to be ground.

` mounted on a shaft |43.

in the general direction of the axis of rotation of' the turret. This relative feeding movement can be obtained in various ways such as that illustrated on thedrawings. As shown, on eachof the wings 2| of the' bed 20 is mounted a substantial bracket |25 which projects upwardly and outwardly from the top of the wing. A fixed horizontal shaft |26 is mounted at its mid-portion on said bracket. A tool carriage |21 is rockably and slidably mounted on said shaft, the end portions of the shaft bearing in the carriage at one side thereof. The carriage projects from the shaft across and above the top of the wing 2|, the side of the carriage remote from the shaft |26 being supported by a roller |28. Mounted on` the carriage |21 approximately above the shaft |26 is a motor |30 connected by any suitable means such as a belt |3| to a shaft |32 which is journalled horizontally in the carriage 2o l |21 to point toward the axis of rotation of the turret 22.

lative position with relation to a piece of work W, and also back and forth across the face of the work, when the carriage |21 slides along the shaft |26. The tool shaft parallel to the carriage rock shaft |26, the axes of these shafts being substantially spaced apart and approximately in the same horizontal plane.

A lateral relative feeding motion between the tool and the work is required when the tool is in operative position to press the tool against the In the illustrated embodiment of the invention, this feeding motion is effected by a slight rocking movement of the carriage |21 about the shaft |26.` Since the tool axis is horizontally spaced from the .rocking axis of the carriage, the feeding movement of the tool is upward or downward, that is, in the general direction of the axis of rotation of the turret. This results in a direction of tool feed which is approximately perpendicular r; to the movement of the work when Ythe turret is l be mounted in the upper end portion of a vertical slide member |40, the lower end being in threaded engagement with the internally threaded hu-b of a bevel gear wheel IM. `This' gear wheel meshes with another wheel Orr this shaft is also mounted a handwheel |46 which may be manipulated to rock the carriage |21. For automatic control of the tool feed, a collar |50 may be frictionally mounted on the shaft |43 to rock therewith, the collar |50 having an arm |5|` extending therefrom and provided at its outer end with a cam follower |52 adapted to ride on the edge of a cam |53. This cam is preferably of' a spiral shapeV so that as the cam is revolved about the axis. o-f a shaft v|55 on` which it is mounted.. the cam follower |52 is swung away from. the axis of the shaft |55, thus rocking the collar |50 and shaft |43. This in turn rocks the carriage |21 and moves the tool |35 against the surface of the work if the tool is' in operative position relative to the work. This tool feeding mechanism includes meansl for adjusting `the feed automatically to compensate for where surface portions of the tool are removed when An idle pulley |33` may be employed to keep the belt clear of portions of the carriage bed by a tapered spring-pressed bearing |621 The truing point is so mounted as to swing in a circle tangent to the periphery of the tool |35 at itsuppermost point, this being the point at `which the tool engages the work. This requires that .the axis. about which the truing point swings is in the vertical plane containing the axis of rotation of the` tool. Thus the pivot |62 must b e either directly above or directly below the axis of the tool |35. Gn the `drawings it is shown as directly below.. The arm |6| may be suitably shaped to clear the-tool when" the truing point is in operative position. |63 may be provided for each arm |6| and connected thereto .as by a link |64, the solenoid being adapted to be energized to swing the arm. |61 and point. |60 into position for. trolng the tool |35. This operative position of the point may be definitely established by a limit stop device such as an arm |65 rockable with the arm |6| to engage a fixed member such as the bed, or a wear-piece mountedthereon, when the point |50 is in correct operative position. A spring |66 may be arranged to pull the arm |6| to inoperative position when the solenoid is. deenergized. The solenoids |63 for the several arms |6| may be simultaneously controlled by a single switch or, as shown, each solenoid may be connected with a separate control switch |61. Each switch is providedV with an operating arm |68 adapted to be engaged by a. cam element |69 on the carriage |21 to open the switch |61 when the carriage advances toward the workso that duringthe grinding operation, the solenoid is deenergized and the spring |66 holds the arm |6| and point |60. out of the way.

For the traversing movements of the tools across the surface of the work hydraulic apparatus may be provided as illustrated particularly in Figures 3 and 4. As shown in Figure 3,a collar |10 is loosely tted on the tubular extension .53 of the turret 22. Projecting radially from this collar |10` are four arms |1|. Three of these arms are connected to links |12 for the reciprocation of the carriages |21, the fourth arm |13 being connected through a piston rod |15 to a power piston reciprocable by a suitable fluid .such as oil under pressure in a cylinder |80. Each arm |12 ispivotally connected at its outer end to an intermediate point of an upright lever |86. Each lever |86 is rockably mounted at its lower end |81 on the bed so that reoiprocation of the arm |12 Vattached to the lever |86 swings the upper end of the lever toward and away from the turret. At. the upper end of each lever |86 may be mounted av roller |89 riding in a groove or equivalent recess in the carriage |21. Rocking of the lever|86 on its pivot |81 thus causesV the carriage |521 to slide on the shaft |26 to move the tool |35 into and out of operative position..

Mechanism for operating, and controllingthe piston inthe cylinder |80; is fully illustrated and described in the application. of Bryant Serial No. 640,846, filed November 2,. 19.32. ISuch mechanism includes valve means. in a valve chest |90-,

and an oil reservoir |=6t containing a pump |02.'

which may be. con-nected to the shaft 68. as: by a pulleyand-belt connection. litt.. The. Valve means. in the chest |90 is directly controlled by a valve.

the4 tool is dressed or trued by a suitable truingl A solenoid f stem 206 which projects therefrom and is 'axially' movable by an arm 250 carried by the piston rod |15 to reverse the direction of motion of the piston. The piston may move through a short stroke to reciprocate the tool on the surface of the work, or through a long stroke to retract the tool from the work for indexing the turret and truing the tool. The stroke of the piston is controlled by a solenoid 250 which, when energized, limits the stroke of the piston to traversing the tools over the work. When the solenoid 260`is deenergized, the piston is permitted a longer stroke to retract the tools from the work, as described in the said application of Bryant. For the automatic control of the solenoid a suitable cam disk 235 may be provided, as shown in Figures '7 and 8. A switch 266 having an operating arm 261 is mounted adjacent to the cam disk 265 so that a cam follow 268, carried by the arm 261, is in engagement with the edge of the disk 265. This edge has a portion oiset inwardly as at 210. When the cam follower 268 reaches the off-set portion 2l@ of the cam edge, the arm 261 rocks opening the switch 256 and deenergizing the solenoid 260 to permit withdrawal of the tools from the Work.

The motor 65, in addition to driving the indexing shaft 86 and the indexing cam H2, may also be employed to drive the solenoid control cam 265 and the feed cam |53. To this end the shaft 68 may be provided with a worm 305 meshing with the gear wheel 39| mounted on the shaft 302. This shaft may be mounted in bearings near the ends of opposite wings 2| of the bed frame.

-The shaft 302 is operatively connected as by bevelled gears 305 and 306 in each of these wings to shafts 301. In the wing 2| of the bed frame into which the shaft 58 extendsa cross shaft 3| may be driven through a worm 3|2 on the shaft E8 and a gear wheel 3l3 on the shaft 3|| meshing therewith. Each of the shafts 301 and 3H is operatively connected with a corresponding shaft |55 as by a suitable train of gear wheels 3|5, 3|6, and 3|"|. Each shaft |55 carries a corresponding feed cam |53, as hereinbefore described. On one of the shafts |55 may be mounted the solenoid control cam 265. As a result of this arrangement, the motor 65 is employed for the simultaneous driving of these various cams.

In order to synchronize the movements of the various cams with the indexing of the turret, the worm 83 is preferably of such a kind as to drive the gear wheel 84 and shaft B5 at about six times the speed of rotation of the indexing cam |2, the solenoid control cam 265, or the feed cam |53. As a result, the indexing movement of the turret to shift the chucks from one operating station to the next takes place during a period equivalent to about one sixth of a revolution of the other cams. This speed ratio may, of course, be altered as desired by selection of suitable gearing for the drive of the several cams.

For` some purposes it may be desirable to drive the work-holders at different speeds for the successive grinding operations. For example, it might be advantageous in some cases to rotate the work-holder at a comparatively slow rate during the rough grinding operation by #l tool, and more rapid rates of rotation of the work during the finishing operations of #2 and #3 too-ls. Such Various speeds at the several operating stations may be obtained in various ways such as by the use of separate driving motors for the several work-holders, as shown in Figures 9-11. As therein shown, a gear wheel 330 may be mounted on'the inner end portion of each" shaft 3|. Each gear wheel 330 meshes with a worm 33| on a shaft 332 driven directly by a motor 335. There is thus a separate motor 335 for each work-holder, these motors being suitably mounted within the turret 22. The speed of the motors is individually controlled according to the station of the Work-holder, any suitable means being employed for this purpose. As shown, the turret 22 is adapted to revolve about a central stationary shaft 335, preferably hollow, on which is mounted a commutator member 331 of insulation. Sets of contact elements 340 are carried by the member 337| in positions for contact with sets of brushes 34|, carried by the motors 335, when theccrresponding work-holders are in positions for operative relation with the tools |35. Thus, in the embodiment illustrated, there are three sets of contact elements 340 for the three work-holders adjacent to the tools, the brushes of the fourth motor having no circuit connections at such time so that the motor is idle and the work in the work-holder can be readily changed. Wires 352 'nay extend from the several contact elements 3115 through the hollow shaft 336 to respective control boxes 355 conveniently located on or near the machine. The setting of these control boxes determines the speed of rotation of each work-holder when it moves into position for a grinding operation.

In the operation of the apparatus as a whole, the turret is indexed while the tools are retracted from their operative position and are being moved slowly past their respective truing tools. The indexing movement of the turret is stopped when one of the stop pins 85 engages the upper end of the stop rod 96. As hereinbefore described, this causes the worm 83 to act as a nut on the gear wheel 84 so as to move the shaft 'i2 axially to disconnect the clutch member I3 from the clutch member 'M as indicated in Figure 6. The spring 82, presented against the end of the shaft 12 through the bearing 80, holds the turret firmly in its indexed position. The hydraulic mechanism is so regulated by previous adjustment that the piston moves the tools |35 into the corresponding pieces of work shortly after the turret has reached its indexed position. When the piston rod reaches its extreme tool-advancing position the solenoid 260 is energized to limit the stroke of the tools to a movement back and forth within the work. At the same time the constant revolution of the shafts |55 brings the feed cams |53 into engagement with the cam followers |52, resulting in a lateral feeding movement of the tools against the surface of the work which is to be ground. During the grinding operation, the index cam |2 is constantly rotated, the deenergizing of the solenoid 265 being timed to permit the retraction of the tools from the work before the recess H3 in the index cam |62 reaches the end of the rod Thus, the tools are all clear of the work when the rod is permitted to move into the recess I3, releasing the stop rod 95. Immediately after this, the squared pin |24 on the cam disk ||2 engages a pin |23 in the end of the arm |22 and rocks the arm |22 sufliciently to relieve the pressure of the spring 82, acting through a stop pin on the stop rod 96. Thus the retraction of the stop rod 96 under the influence of gravity and the spring |55 is permitted so that the turret is then free to be revolved. The pin |23 thereupon rides clear of the pin |24, permitting the arm |22 to swing back and the shaft 12 to move axiallyy so as to reengage the clutch memitt bers It', 141 The` shaft` 12 is thereupondriventhrough the gear wheels 'it and 1 I, this resulting in indexing movement of the turret to the next position. Since the time-required for the grinding step is considerable, ample time is available during the grinding step for an operator to remove the finished' piece of work in the chuck at invention as defined in the following claims.

I :claim: I. In a machine of the class described having a bed, aturret rotatable on said bed about a vertical axis, and a plurality of radially projecting work-holders on said turret, a plurality of tool carriages mounted on said bed, each said tool carriage being roclrable on a horizontal axis, means associated with each tool for rotating the tool on an axis parallel to the rocking axis of the car- ?-1 riage, means for advancing each tool along its own axis toward the turret, and means for automatically rocking each carriage while the tool is inposition for engagement with the work to impart lateral feeding movement toy each said tool.`

`2. In a turret grinding machine, a flat turret, a werk-holder carried by said turret and arranged transversely with respect to the turret axis, a tool rotatable on an axis aligned with said holder, driving means for said tool, a carriage supporting said tocl and" driving means,` means rockably supporting said carriage, means for rocking said carriage on an axis transverse to the turret axis, whereby lateral feeding movement is imparted to said tool, and means for reciprocating said carriage and tool toward and from said turret.

3; A machine of the class described comprising a rotatable turret, a plurality of work-holders carried by .said turret and rotatable on axes transverse tothe turret axis, a tool into operating relation with which said work-holders may be successively positioned by indexing of said turret, and power means for producing relative feed motion between said tool and the holderin operating relation therewith in the general rdirection of the axis or" rotation of said turret.

4. A machine of the class described comprising a rotatable turret, a plurality of Work-holders carried by said turret, a tool into operating relation with which said work-holders may be successively positioned by indexing of said turret,

means for traversing said tool ,relatively to the work on which it is `operating in a direction transverse to the turret axis, and power means for` producing a predetermined relative feed motion between said tool and Work in the general direction oi the axis of rotation of the turret.

5. A machine of the class described comprising a rotatable turret, a tool rotatable on an axis transverse to the axis of rotation of the turret, a plurality of work-holdersmovable successively into operative relation with said tool by indexing oi `said turret, means for traversing saidtool in the direction of-its axis, and power driven cam means for producing a predetermined feeding motion between the tool and work in the general' direction of the axis of rotation of the turret.

f"6. A machineof the class described comprising a rotatable turret, a plurality of work-holders arranged radially in said turret, atool rotatable on an axis substantially perpendicular to the axis of rotation ot said turret, means for indexing said turret to positions in which the work-holders are brought successively into operative relation with said tool, means fortraversing said tool in the direction of its axis, means for producing a predetermined teeding movement between said tool and work` in the general direction of the axis of rotation of the turret, and common driving means for the indexing and feeding means. Y

7. A machine of the class described comprising a rotatable turret, a rotatable tool, a carriage for said tool rockable on an axis parallel to the tool axis to impart feeding movement to the tool, the tool rotation axis and carriage rocking axis being in a plane substantially perpendicular to the axis of rotation of the turret, and a plurality of work-holderson said turret movable successively into operative relation with saidtool by indexing ofthe turret.l l,

, 8. A machine ofthe class described comprising a rotatable turret, a rotatable ftoola carriage for said tool rcckable on an axis parallel to the tool axis to impart feeding movement to the tool, the tool rotation axis and carriage rocking axis being in a plane substantially perpendicular to `the axis of rotation of the turret, a

plurality of Work-holders `on said turret movable successively into. operative relation with' said tool by indexing movement of the turret, and means for traversing said tool'in a direction transverse to the axis of rotation of the turret.

9; A `machine of the class described comprising a rotatable turret, a plurality of rotatable tools, a plurality of work-holders carried by said turret and movable into operative relation with successive tools by `indexing of said turret, and power driven cam means for simultaneously feeding said tools. transversely of their respective axes of Vrotation and in a direction substantially parallel to the axis of rotation of said turret.

10. A machine of the class described comprising a rotatable turret, a plurality of tools, a plurality `of Work-holders carried by said turret and movable into operative `relation with successive tools by indexing of said turret, means for simultaneouslytraversing said tools `relatively to adjacent work-holders, and power means for automatically and simultaneously feeding said tools at independent predetermined rates in the general direction of the axis of rotation of said turret.

11. A machine of the class described comprisnga turret rotatable about a vertical axis, a plurality of work-holders carried by said turretand arranged radially therein, a plurality of tools arranged around said turret to be simultaneously in operative relation with diierent ones of said work-holders, said tools being rotatable on axes transverseto the turret axis, means for indexing said turret to shift said work-holders from one tool to the next, meansfor simultaneously traversing said toolsalong their respective axes, and means forfeeding said tools in the general direction ofthe axis of rotation of the turret.

12. A machine of the class described comprising a bed, a turret rotatable on said bed, workholders carried by said turret, a plurality of tools arranged for simultaneous operative relation with certain of said work-holders, means for indexing said turret to shift said work-holders from tool to tool, a carriage for each said tool rockable on an axis transverse to the axis of the turret to impart feeding movement to the tool, said carriages being slidable along their rocking axes to impart traversing movement to the tools toward and from` the axis of said turret,

and means engaging said carriages at points adjacent to their respective Working axes to irnpart sliding movement to saidcarriages simultaneously. f Y

` 13. In a machine of the class described, a rotatable grinding tool, means for imparting lateral feeding movement to said tool, and a truing device for said tool comprising an arm having a truing element thereon movable to and from a position in contact with the tool at a point in the path of feeding motion of the center of the tool, said arm being pivotally mounted at a point beyond the opposite side of the tool and in line with said point of contact and the center of the tool, whereby the peripheral contour of the tool is internally tangent to the circular path described by the truing element in moving to and from operative position.

14. In a machine for internal grinding, a grinding tool rotatable on a horizontal axis, means for imparting upward feeding movement to said tool, and a truing device for said tool comprising an arm having a truing element thereon movable into and out of contact with said tool at its uppermost point, said arm being pivotally mounted at a point directly below the center of said tool, whereby the path of movement of said truing element is tangent to the peripheral contour of the tool.

15. In a turret grinding machine, a Work-holder carried by said turret, a tool rotatable on an axis aligned with said work-holder, a carriage for said tool movable toward and from said workholder, a bed onA which said carriage is slidably mounted, an arm pivotally mounted on said bed, a truing device carried by said arm and movable thereby into and out of operative position for truing said tool, means including a solenoid for rooking said arm to move the truing device into and out of operative position, and means for automatically controlling said solenoid, said control means including a switch and means actuated by movement of said carriage toward the Workholder to operate the switch for the Withdrawal of said truing device from operative position, said last named means being actuable by movement of the carriage away from the Work to operate the switch for the movement of the truing device into operative position.

16. In a turret grinding machine, a turret revoluble on a vertical axis, a plurality of Workholders radially arranged on said turret, a plurality of tools rotatable on axes aligned respectively with certain of said work-holders, carriages for said tools movable to reciprocate said tools along their respective axes, and means for simultaneously reciprocating said carriages, said last named means including a rockable member coaxial with said turret, means for rocking said member, upright lever arms pivotally mounted at their lower ends and connected to respective carriages at their upper ends, and connecting rods extending between said members and intermediate points of said lever arms.

17. A machine of the class described comprising a rotatable turret, a plurality of work-holders carried by said turret and movable thereby into successive operating stations, tools at the severaloperating stations arranged to be in operative relation to the work-holders in succession, and means fcrautomatically rotating the workholders at the several stations at different predetermined speeds.

18. A machine of the class described comprising a rotatable turret, a plurality of tools, a plurality of rotatable work-holders carried by said turret and movable into operative relation with successive tools by indexing of said turret, means for feeding said tools in the general direction of the axis of rotation of said turret, and means for automatically rotating said work-holders at different predetermined speeds, the speed of rotation of each Work-holder at any time being determined by the operating station which it occupies at the time.

19. A machine of the class described comprising a rotatable turret, a plurality of tools arranged about said turret and each rotatable on an axis transverse to the axis of rotation of the turret, a plurality of Work-holders movable successively into operative relation with said tools by indexing movement or" said turret, means for traversing each said tool in the direction of its axis, and means for automatically rotating the Work-holders at different speeds predetermined for operation with the several individual tools.

20. A machine of the class described comprising a rotatable turret, a plurality of tools arranged about said turret and each rotatable on an axis transverse to the axis of rotation of the turret, a plurality of work-holders movable successively into operative relation with successive tools by indexing movement of said turret, means for traversing each said tool in the direction of its axis, and power means for automatically and independently feeding each said tool in the general direction of the axis of rotation of the turret.

21. In a turret grinding machine, a work holder carried in said turret, a tool rotatable on an axis aligned with said Work-holder, a carriage for said tool movable toward and from said workholder, a bed on which said carriage is slidably mounted, a truing device rockably mounted on said bed, a solenoid actuable to rock said device into and out of operative position, and control means responsive to certain movements of said carriage for controlling the energization of the solenoid.

22. In a grinding machine, a work-holder, a tool rotatable on an axis alined with said workholder, a carriage for said tool movable toward and from said work-holder, a bed on which said carriage is slidably mounted, an arm pivotally mounted on said bed, a truing device carried by said arm and movable thereby into and out of operative position for truing said tool, a solenoid actuable to move said arm into and out of operative position, and control means responsive to movement of said tool away from the Work to energize said solenoid to move the truing device into operative position, said control means being responsive to movement of the tool toward the Work to deenerergize said solenoid.

23. A machine of the class described, comprising a plurality of tools, a plurality of rotatable Work-holders movable in turn into operative relation with successive tools, and means for automatically rotating each work-holder at different speeds according to the particular tool with which it is in operative relation.

` 24. A machine of the class described, comprising a plurality of Work-holders movable in turn into operative relation with successive tools, means for simultanenously moving all said workholders from their operating stations to the next succeeding stations, means for automatically rotating each work-holder at different speeds according to the successive operating stations occupied thereby.

MERTON H. ARMS.

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