US2046238A - Automatic work driving device - Google Patents

Description

June 30, 1936. 'H E. BALSIGER" AUTOMATIC WORK DRI VING DEVICE 5 Sheets-Sheet l Filed Nov. 10, 1932 INVENTOR Meow EBALG/q'fi June 30, 1936. H, BALSIG'ER 2,046,238

AUTOMATIC WORK DRIVING DEVICE Fil ed Nov. 10, 1952 5 Sheets-Sheet'Z INVENTOR am 501.64 gm.

June 30,1936. H. E. BALSIGER AUTOMATIC WORK DRIVING DEVICE Filed Nov. 10, 1932 5 Sheets-Sheet 3 'INVENTOR QwEBusiqmJ I I I June 30, 1936. v H, ER 2,046,238

AUTOMATIC WORK D RIVI-NG DEVICE I Filed Nov. 10,1952 5 Sheets-Sheet 4 INVENTOR Momma/km. I

June 30, 1936. 4 'H BALSIGER 7 2,046,238

AUTOMATIC WORK DRIVING DEVICE Filed Nov. 10, 1932 5 Sheets-Sheet 5 INVENTOR 7 M20: [Baas/95R.

Patented June 30, 1936 5 i UNITED STATES AUTOMATIC WORK DRIVING DEVICE 7 Harold E. Balsiger, Waynesboro, Pa., assignor to Landis Tool Company, Waynesboro, Pa., a corporation of Pennsylvania 7 Application November 10, 1932, Serial No.642,101

6 Claims.

This invention relates to work holding and driving mechanism and its object is to provide a-work drive device which will operate to hold the work correctly and drive it correctly regardless of certain inaccuracies either in the shape or in the position of the work.

A further object is to provide a work driving device which is automatically operated and in which the work may be placed without stopping rotation of the headstock.

Further objects and advantages will become apparent from the description which follows.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a front view of the device with a cover plate removed,

Figure 2, a section on line 22 of Figure 1,

Figure 3, a section on line 33 of Figure 1,

Figure 4, a section similar to Figure 3 showing the device clamped on work which is neither straight nor concentric,

Figure 5, a face view of Figure 4,

Figure 6, a front view showing a relatively large piece of work in position with the device in clamped or driving position,

Figure '7, a view similar to Figure 6 with the work in unclamped position,

Figures 8, 9, 10 and 11 are detail views of the several parts of the chuck,

Figure 12 is a side elevation of friction means for operating the device, and

Figure 13, a side elevation showing a foot pedal control for. operating the device.

In the drawings numeral 20 indicates a face plate which is carried by a footstock spindle l9. The spindle may be either of the live or dead spindle type, that shown being preferably of the dead spindle type. A driving ring 2| is secured upon the face plate 20 by means of screws 22. The ring 2| also carries pins 23 upon which are mounted rollers 24 which rollers are adapted to drive the work holding dog 25 as will be more fully described hereafter. A dog opening finger 26 is pivotally mounted upon a pin 21 which pin is fixed in the ring 2|. The driving ring 2| also carries radial pins 28 which are fixed in its periphery. These pins have a flattened surface on their outer ends against which seat springs 29. These springs also seat against surface 30 on the interior of a friction release ring 3|. The finger 26 extends through a notch in the ring 2| and engages a notch 32 in the friction release ring 3|. A friction band 33 is anchored at 34 to the base of the machine and secured at 35 to an operating lever 36 which is pivotally attached to the bed of the machine at 31. The lever 36 is operated by means of a foot pedal 38 and a connecting link The work driving dog 25 has two opposed notches 40 in which the driving rollers 24 engage. The dog 25 is loosely fitted within the driving ring 2| to allow for movement of the dog to clamp work which is out of parallel with the axis of the center H! or which may not be perfectly round. The dog 25 has a block 4| secured to one face by means of a pin 42. The inner end of this block is V-shaped so as to engage a work piece 5|. A cooperating clamping jaw .43 is. pivotally attached by a screw 44 to the dog and is urged toward work engaging position by means of a' spring 45. The spring 45 is positioned about'suitable guide pins 46 to hold it in place. When the dog is in assembled position the dog opening finger 26 fits loosely between clamping jaw 43 and a surface 4'! on the dog with the driving rollers 24 positioned loosely in the notches 46. A cover plate 48 is held in position by screws 49 to hold the entire assembly together, the cover plate being provided with a hole 50 through which the work may enter into the dog or work driving device. V r

In' operation, the parts normally rotate in a counterclockwise direction. 'When the dog is to be opened to insert work therein or to remove work therefrom the foot pedal 38 is operated. This brings the bands 33 into frictional contact with friction release ring 3| to retard rotation of this ring, the ring 2|, however, continues to rotate. Rotation of the ring 2| faster than the ring 3| moves the finger 26 toward the right and thus pushes the clamping jaw 43 away from the surface 41, thus opening the work driving jaws to permit removal of the work or to position new work within the jaws. The friction release ring 3| is moved against the tension of the springs 29. As soon as the foot pedal 38 is released the springs 29 will bring the rings 2| and 3| into such a position that the finger 26 will release the movable dog 43 to allow the parts to assume work clamping position. From the description given it will be apparent that the device may be opened with out stopping rotation'of the headstock and that the opening is automatic. In Figures 4 and 5 the work piece 5| is not in axial alignment with the work center. The work drive dog 25 is shown in a position at which it has adapted itself to the position of the work, i. e. the dog is not in a plane which is parallel with the face plate 20 and the ring 2| and the associated parts. This device shows the adaptability of the device.

In Figure 5 the work is shown to be off center,

the work driving device has shifted to adapt itself to this position of the work; To adapt the device for use with work, of difierent sizes it is necessary only to change the V-blocks 4] and the movable dogs 43 as shown in Figures 6, and 7.

. In Figure 6 a relatively short V-block '52 is applied to the dog and a movable jaw 53 having a'suit'able cut-out portion 54 is pivotally adapted to the resilient means for moving the movablefljaw to dog] In other respects the parts of the device are unchanged; ,7

'11; will be obvious to'thoseskilled some art that various changes maybemadein' my device without departing from the spirit of the 'inveiif tion and therefore I do not limit myselt to what is shown in the drawings 'anddescribedv in the specification, but only as indicated in the appended claims, 1 v

' Having thus fullydescribedgmy said invention, what Lclaim as new and desire to. secure by Letters'Patent, I L

J 1. A work driving device comprising a spindle, a face platesecuredthereoma driving-ring secured to, the face plate, a driving dog mounted within the. driving ring, said driving dog having opposed notches therein, rollersmounted'on the driving. ring engageable in said notches for driving thedog from the driving, ring, a stationary jaw on the driving dog, ,amovable jaw cooperating with the stationaryjaw'for gripping the work,

work gripping .position, afinger mounted on the I driving ring. movable to engage the movable jawv to release the. work, a friction release ring positionedabout thedrivingring, saidfriction releasering having a notch into which one end of [the saidfinger engages, the friction release ring 40;-

being normally rotated with the driving ring duringoperaticnot themachine, and afriction driving the dogirom the driving ring, a stabrake engageable with ,thefriction releasering to retard its motion, such retardation causing the said finger to movethemovable work engaging jaw out of contact with the work, substan tially as set forth. I l r 2. A work driving device comprising a spindle, a face plate secure-d thereon, a driving ring secured to the face plate, a driving 'dog' mounted within the driving'ringfsaid driving 'dog having opposed notchestherein, rollers mounted on,

the'drivingring engageablein said notches for 1 'tionary 'jaw onthe driving dog, a movablerjaw which one end of the said finger engages, the

cooperating with "the stationary jaw for grip *ping the work, resilient means for moving the movable jaw to work gripping position; a finger mounted on the driving-ring movable 'to' engage the movable jaw to release the work, a friction release ring positioned about the driving ring, said friction release 'ring having a notch into friction release ring being normallyrotated with the driving ring 'during' operation of the machine, and a friction brake engageable withthe friction releasering to retard its motion, such,

retardation causing the said finger to move the movable work engaging jaw out of contact with the work, said work engaging dog being loosely mounted in the saidjdriving ring whereby it may, align itself with the work which is out of perfect alignment with the spindle and when work is nonconcentric and inaccurate in shape, substantially as set forth. a 7 i 3. A work driving device comprisinga plate having a fixed and a movable work engaging jaw thereon, resilient means for' urging the movable jaw to work engaging position, means for supporting and driving said plate, a fingenmounted on'said last named means'en ageable with said movable jaw to move it to'swork releasing posi-' tion and a frictionring mounted on said driving l means and resiliently driven thereby and engage:

able with said finger when the ringis retarded y'inits rotation andmeans for retarding rotation of said ring to releaseI the work. 7

"45A work driving-device comprising a, plate "havingfa fixed andamovable work engaging jaw "thereon, resilient means mounted on said plate for urging the'movable jaw vto work engaging a I V 7 position, a plate for supporting and driving said first named plate, means on said last named plate engageable'with notches in saidfirst named plate for driving'the, first, plate by the second;

Vmeans for securing said first named plate against axial movement; said last named, means providing. suflicient; clearance to permit an axial float of the first plate relative to the, second plate, a ring,

mountedon said secondplate and resiliently driven thereby,said ring rotating'normally with,

said plates, work releasing means means on said ring for engaging workreleasing, means when ro-f tation ofsaid ring is retarded relative to rotation o'fithev said plates and; friction; means engageable with saidq-ring ior retarding its jrotation tore- V providing afclearanceto permit axial floating of one plate with respect totheothena movable and a fixed work engaging jaw mounted onv the driven plate, resilient; means ,mountedton the engaging position, means on thedriving plate driven plate for moving 'themovable jaw to work engageable-withthe movable work engaging jaw' to move it to work releasing-position, saidlast named means being engageable byv said'ring to its rotation with 'said plates and for retarding rotation" of said ring,

6. A device of the kind describe release the work when said ring .is retarded in' friction means (1 comprising a floating work driving dog .havingja movable and. r

a fixed work engaging j aw mounted thereon, a plate for supporting and driving said dog, means.

onsaid plate engageable ,with said movable'jaw for releasing the work, means on said dog for.

holding'said jaws'in work'grippin position, a1 ring mounted on said plate and 'being resiliently driven therebyysaid ring being;.engageable with said jaw releasingmeans upon a retardation'joithe rotationof said ring with respect to'the rotation of the plate, and friction means engageable with said ring for retardingits rotation to re-i lease the'work.

V, w HARQLD E. BALSIGER.

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