US1977964A - Automatic chucking machine - Google Patents

Description

Oct. 23, 1934. H. J, HAUCK ET AL 1,977,964

AUTOMATIC GHUCKING MACHINE Filed July 18, 1932 7 Sheets-Sheet 1 :J-wwzhhz5 fianzy cf Hauok Z smnzb 7? 60m 0d. 23, 1934. J HAUCK ET AL 1,977,964

AUTOMATIC CHUCKING MACHINE Filed July 18, 1932 7 Sheets-Sheet 2 Harry :[Hczuck Stanley T6055 Oct. 23, 1934.

H. J. HAUCK ET AL AUTOMATIC GHUCKING MACHINE Filed July 18, 1952 7 Sheets-Sheet 3 ffczrzzy c1 Hauck SzankzyTGosS Oct. 23, 1934. H. J. HAUCK ET AL 1,977,954

AUTOMATIC CHUCKING MACHINE Filed July 18, 1952 7 Sheets-Sheet 5 Rig 8 10 gme'nicms Oct. 23, 1934. J uc ET AL 1,977,964

AUTOMATIC CHUCKING MACHINEv ESQ ffarzy 1 Hauok Stan [e5 7. 6085 35*: cup,

Get. 23, 1934. H J HAUCK Er AL- 1,9' 77,964

AUTOMATIC CHUCKING MACHINE Filed July 18, 1952 7 Sheets-ShQet 7 Patented Got. 23, 1934 UNITED STATES FATE T OFFICE 1,977,964 AUTOMATIC onuonmo MACHINE ration of Connecticut Application July 18, .1932, Serial No. 623,146

21 Claims.

This invention relates generally to metal working machines, and has particular reference to machines known as automatic chucking machines of the type having a plurality of tool spindles and a plurality of workholding devices or chucks,

the latter being successively indexible into operative relation to the several tool spindles in order that successive operations may be carried out on the pieces of work.

1 The object of the invention is to provide an improved chucking machine which is characterized by its simplicity, compactness, and economy in construction and arrangement; by the ease and facility with which the parts may be adjusted or repaired, the parts being readily accessible; by its strength and durability; and by its efiiciency and effectiveness in operation, it being capable of handling a widevariety of kinds of work of various sizes at a relatively high rate of production, and it requiring no attention on the part of the operator after it has been adjusted to a certain piece of work and set in motion except to load and unload the work being handled. By the use of our improved machine,

the various operations may be very accurately and rapidly carried out with the result that superior pieces of work are produced at a relatively low cost.

A. further object of the invention is to provide 39 in a machine of thischaracter fluid operated means of an improved and simplified arrangement for accurately, quickly and yet smoothly indexing the turret on which the work holding devices are mounted. Our fluid means is such that it may be easily controlled and it requires little or no attention in the Way of repairs or the like, stuffing boxes being entirely omitted.

A still further object of the invention is to provide an improved automatic chucking machine 44} wherein the chucks are automatically opened and closed at the loading station through the instrumentalities of electric motors, one for each chuck, the motors being indexible with the chucks and being so associated therewith that operation of the chucks by means of the motors is effected only as the motor has attained speed without load.

Other objects will be in part obvious and,in part, pointed out more in detail hereinafter.

5Q The invention accordingly consists in the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction set forth and the scope of the application of which will be indieatedin the appended claims.

It is to be understood that while we have shown but one embodiment of our invention in the accompanying drawings, this showing is by way of exemplification only, the inventionbeing susceptible of various modifications and changes 0 in construction, arrangement and operation which would be within the spirit of the invention, and certain of the novel features and characteristics may be employed in other combinations than those herein described. 5

In said drawings, n

Fig. l is a front elevational View, of a multiple spindle automatic chucking machine in which our improvements are incorporated;

Fig. 2 is a sectional development of one of the 7 tool spindles, a portion of the drive therefor. I and the means for moving the slide which carries this spindle;

Fig. 3 is a right-hand end view of the machine as viewed in Fig. l; i 7

Fig. 4 is an elevational view looking at the other endof the machine.

Fig. 5 is a detail view in top plan, showing the two tool slides connected together so as to be operated as a unit;

Fig. 6 is an end view of what is shown in Fig. 5;

Fig. 7 is a rear side elevation of the work holding and indexing cylinder head;

Fig. 70. is a diagrammatic layout of the fluid operated actuating mechanism for the turret;

Fig. 8 is a sectional view taken longitudinally, vertically and centrally through the turret and the support therefor;

Fig. 9 is a sectional view taken transversely and vertically through the turret and the pneumatic indexing means therefor, this View being taken substantially on line 9-9 of Fig. 8;

fig. 10 is also a transverse sectional view through the turret, this view being taken substantially on line 1010 of Fig. 8; and

Figs. 11 and 12 are elevational views of two of i the elements of the connection between a motor and its associated chuck.

Referring to the drawings in detail, 10 designates' a base having at one end thereof longitudinally extending ways 11 on which is mounted for adjustment a work-holding head in the form of a slide 12 in which is located an indexible turret 13 provided at its forward end with a plurality of work-holding or chucking devices C angularly arranged at like distances about the axis of the turret. Upon the other end of the base are mounted two slides 16 and 17 in one of which is located a threading spindle 18 adapted, when rotated, to move axially of the slide in which it is mounted. In the other slide is a rotatable tool spindle 19 adapted to move axially with the slide. The work spindles are, of course, spaced corresponding to the disposition of the chucking devices C' so that, when the turret is in indexed position, the respective pieces of work are aligned with the respective tools at the first and second stations.

Normally, the tool slide 16 which carries the threading spindle is fixed against movement, as by means of a screw 20. The threading spindle may correspond in structure to that shown in the patent to Goss No. 1,843,976 and may be driven in like manner by a motor 21. It its here sufiicient to say that when the spindle is rotated in one direction, it will advance axially in timed relation to its rotary movement, and when its direction of rotation is reversed, it will move longitudinally to its original position. The spindle 18 may be driven by a motor 15. The spindle 19 is journalled in the tool slide 1'7, as shown most clearly in Fig. 2. This slide may be moved in the direction of the length of the spindle through the instrumentality of a cam 22 having a cam groove 23 in which is engaged a roller 24 carried by the slide. The spindle 19 may be driven in any suitable manner from a motor 21. This motor may be connected up through shafts and gearing (not shown) to a gear 26 secured to a shaft 27 journalled in a base and carrying a pinion 28 meshing with a long gear 29 which is jcurnalled in the slide. This gear meshes with the gear 30 fixed to the spindle 19. The cam 22 may also be driven from the motor 21 through any suitable mechanism a portion of which is shown as including a shaft 31 carrying a worm 32 meshing with a worm wheel 33 fixed to one end of the cam. The cam first advances the slide so as to feed the tool carried by the spindle into the work and then it withdraws the slide. When the slide reaches its inoperative position, it is desired to stop movement thereof during which time the turret may be indexed and, to this end, the driving connection between the motor and the worm wheel 33 may include a suitable clutch 34 which may be controlled by a cam or trip 35. This trip is journalled on a bearing 36 adjacent one end of the cam 22 and carries a roller 37 adapted to engage an arm 38 fixed to a trip shaft 39 which extends along one side of the machine. The cam carries a pair of spaced pins 40 and 41 between which the trip extends, and the trip is normally urged against the pin 41 by a spring 42. The clutch has a yoke 47 fixed to a shaft 48 which is connected up to the trip shaft by a link 49. With this arrangement, it being assumed that the cam 32 is rotating in a counter-clockwise direction with reference to Fig. 4, the trip is normally held against the pin 41 until it engages the arm 38 when it assumes the position shown in Fig. 4. Upon further rotation of the cam, the arm 38 is thrown down so that the roller 37 will pass it and then the spring 42 will advance the trip against the pin 41. When the arm is thus thrown down, the clutch 34 will be disengaged. The means for turning the trip shaft in the opposite direction is associated with the turret and will be described later.

The mechanisms for driving the tool spindles and the means for moving the slide 19 are disvention, the tool slides are mounted on the base at an angle to one another, in the present instance, an angle of 90 being disclosed by way of illustration; that is to say, each of the slides is mounted in the machine at an angle to a horizontal plane, in the present instance, that angle being 45. Referring more particularly to Fig. 4, it will be seen that the ways or surfaces 43 on which the slides are mounted are disposed at 90 to one another. This arrangement is of advantage in that the slides may be exceptionally rugged and weighty in construction, and the machine may be made more compact.

Also, in accordance with the present invention, an arrangement is provided whereby both of the slides may be moved in unison so as to advance and return the tool spindles together. To this end, the arrangement shown in Figs. 5 and 6 may be employed. On the top of the slide 17 are fixed two spaced arms 44 and on the top of the slide 16 is fixed an arm 45 which extends between the free ends of the arms 44. The arms 44 carry screws 45 the free ends of which are adapted to engage the opposite sides of the arm 45. When it is desired to move the tool slides together, the screw 20 is removed and the arrangement shown in Figs. 5 and 6 is adopted. When the slides are connected, as shown in Fig. 5, the single cam 22 moves both of the slides in unison.

Referring now more specifically to the turret end of the machine, the turret, as shown in Fig. 8, comprises a generally cylindrical hollow member provided with. a front end wall and a removable rear wall or plate 50. The turret, at its forward end, has a circumferential flange 51 adapted to engage the forward end of the slide 12. The rear wall is rabbeted to provide a flange 52 adapted to engage the rear end of the slide so that axial movement of the turret within the slide is prevented. The forward end of the turret is supported for indexible movement in cylindrical ways or bearings 53, and the rear portion 13 of the turret is of lesser diameter than the por tion which is located in the bearings 53. The forward end of the turret carries suitable chucks which may be of any desired number. Where three chucks are provided, as shown in the drawings, these chucks are spaced apart 120, and the turret is indexed from one position to another through 120. When a chuck is in the upper position, it is not disposed in a line with any spindle, this being the loading position at which the operator may remove the finished work and position a new piece within the chuck. The other two positions of the chucks are operating positions and are respectively in alinement with the two spindles 18 and 19. These chucks may be of any suitable type, the specific details thereof not being shown in the drawings as the particular construction thereof forms no part of the present invention. In these drawings, the chuck is shown as having a head or body 55 fixed to the forward end wall of the turret by screws 56; radially movable jaws 57, and an axially movable wedge 58 adapted, when advanced, to force the jaws apart and, when withdrawn, to move the jaws towards each other and into gripping relation with the work. These chucks are disclosed, for illustrative purposes, as being of a type similar to that disclosed in the patent to Garvin, et al, No. 976,452. The chuck body has a sleeve portion 60 extending rearwardly into the turret and within this sleeve is slidably mounted a pull bar 61 having a threaded stem 62 screwed into the wedge 58 so that the pull bar and wedge will move in unison. The pull bar has a threaded bore which receives the forward threaded end of a shaft section 63 carried by bearings 64 located in the rear end of the sleeve 60. The wedge, pull bar, and shaft section comprise chuck operating means. Thechucks are opened and closed by electric motors, there being one motor for each chuck. These motors, designated generally by the numeral 65, are secured to the rear face of the rear wall 50 of the turret as by means of screws 66 and with their motor shafts 67 in alinement with the respective shaft sections 63. These motors are of a type which are reversible by changing the electrical connections and which may be stalled without burning out. They may be controlled in any suitable manner but, by preference, each is provided with three terminals 68. These terminals are adapted to engage respective fixed contacts 69 when the motor is brought to the loading position shown in Fig. 8. The terminals maybe of anysuitable construction, they being shown, in Fig.3, as comprising spring fingers. The contacts may be connected up to a conveniently located switch which is diagrammatically shown in Fig. 8 and designated generally by the letter S. It will be observed that each motor shaft extends to the rear end of the motor casing and is squared, as at 6'7, so as to be received by a socket wrench or the like when it is desired to manually operate the chucks.

It is necessary, in order to prevent rotation between a chuck and the work piece that the jaws be forced tightly against the work. In order to disengage the jaws from the work, considerable force is necessary and, unless the driving motor for the chuck were very large and cumbersome, it could not, if directly connected to thechuck operating means, open the chuck. In accordance with the present invention, we provide between each motor and its associated chuck an improved and simplified connection which will permit of a substantial lost motion between the motor and the chuck operating means in order to allow the motor to start freely and without load and thus build up sufiicient forceto disengage the jaws from the work. This lost motion connection comprises a relatively large number of successive elements interposed between the motor shaft and the shaft section 63 (comprising the rotary element of the chuck operating means) the first of the elements being connected to the motor shaft and the last one to the shaft section and each of the elements having a limited lost motion relative to the next succeeding one whereby the successive elements are picked up in order and the lost motion between the adjacent elements is accumulated.

Referring to the specific embodiment shown in the accompanying drawings, and particularly Figs. 8, 11, and 12, the elements of the lost motion connection are in the form of disks, the first and last of which are designated by the numeral 72, and these two disks are respectively connected to the motor shaft and the shaft section 63. Interposed between the disks '72 and journalled on the shaft section 63 are disks 73 and intervening disks 74. The disks may be of any suitable number. Each of the disks '73 has an eccentrically positioned pin 76 the opposite ends of which constitute studs projecting from the opposite faces of the disk. Each of the disks H has, on each of its faces, an annular groove '77 (see Fig. 11) interrupted by a web '78 so that the groove is just short of being continuous. The

opposed faces of the end disk '72 are alsoprow vided with grooves 77. The ends of the pins '16 position, the piece of work is positioned between the jaws of the chuck and then the operator will, through the switch S (which may be of the pushbutton type) throwthe current onto the motor so that the motor will rotate in one direction. As the motor rotates; each disk, after it has made substantially a complete revolution, will pick up the next succeeding one until finally the foremost disk 73 will pick up the disk 72 which is fixed to the shaft section 63. The lost motion between the successive disks is thus accumulated, permitting-the motor to assume full speed without load. When the last disk l3 picks up the disk '72 which is fixed to the shaft section, the shaft section is given a sharp turn or torque so as to impart to the wedge 58 a sharp, quick initial movement; then it is an easy matter for the motor to move the jaws into gripping relation with the work. When the jaws are in full gripping relation to the work, the motor stalls. When it is desired to unchuck the work, the operator again actuates the switch so as to reverse the connections through the motor, whereupon the motor will rotate in the opposite direction. The motor is now free to revolve until all the lost motion between the successive disks is taken up and then the shaft section 63 is given a sharp initial turning movement which would cause the wedge 58 to be initially withdrawn with a jerk or jar. The jaws 57 now being free of the Work, the motor, which has assumed full speed, will move the jaws to full open position at which point the motor again stalls. It will be understood, of course, that the lost motion featureof our invention is not limited to the specific application illustrated, it being obvious that it is capable of use in other arrangements.

Reference will now be had to the means for indexing the turret so as to move each chuck successively from a loading position to a position opposed to the tool spindle 19, then to a position opposite the threading spindle, and then back to the loading position. This indexing means includes a fiuid operated actuating mechanism and a driving connection between that mechanism and the turret, the fluid operated actuating means being controlled in part by the mechanism for moving the tool slides and in part by the indexing movement of the turret. This fluid operated actuating mechanism is of a novel and advantageous construction, it being, as hereinafter pointed out more in detail, devoid of stuffing boxes or other parts likely to get out of order or leak, and it being adaptable to index the turret through any desired angle and at the desired speed with a smooth action. In the present instance, the turret, which is provided with three chucks, is moved through an angle of upon each indexing movement but it is obvious that our improved arrangement may be employed where the turret has a number ofch'ucks other than inc cylinder having a larger bore at one end than at the other end. The cylinder has a larger bore than the cylinder 81. Located within the cylinders is a piston having a rack bar 82 provided at one end with an enlarged piston head 83 located in the larger cylinder 80 and a smaller piston head 84 slidably mounted in the bore of the smaller cylinder 81. The reciprocating rack bar 82 meshes with a pinion 85 which is connected up to the turret in the manner hereinafter described more in detail. At the forward end of the large cylinder 80 is a valve head 86 having a through opening 87 to one end of which is connected the pressure air line 88 leading from a suitable pressure device or pump. Leading from the opening 87 to a valve chamber 89 is a port 90, and leading from this valve chamber to the large cylinder in front of the piston head 83 is a port 91. The inlet port 99 is controlled by a valve having a head 92 and a stem 93. The valve is fixed to a diaphragm 94. Leading from the air cylinder 80 to an exhaust chamber 95 is an outlet port 96 which is controlled by a valve 9'? similar to the valve which controls the inlet port 90. Leading from the exhaust chamber 95 is an exhaust pipe 98.

The remote or rear end of the small cylinder is maintained under a constant pressure from the air line so as to exert a pressure on the piston normally urging the same forwardly, that is, to the left referring to Fig. 9. In order to control with great nicety the speed at which the machine is indexed and in order to cushion the indexing mechanism and thus relieve the machine of jars and shocks, the arrangement is such that the rear end of the small cylinder is connected to the air line so that the air may pass freely into the space behind the small piston head on the inoperative or forward stroke, but the flow of the air from that space on the operative stroke of the piston is restricted or retarded. In the present instance, one end of the opening 87 is connected by means of a pipe 99 to the rear end of the cylinder 81 and interposed in this pipe is a check valve 100 which is opened by the air line pressure and which is closed by the pressure set up in the small cylinder when the piston is moved to the right referring to Figs. 4, 7a, and 9. Between the rear end of the small cylinder and the air line (in the present instance, in the branch pipe 99') is a controlling valve 101 which is shown for illustrative purposes as being in the form of a needle valve. The valves 92 and 97 are adapted to be alternately operated through the instrumentality of a rocking lever 102 which is controlled in the manner hereinafter described in detail.

It will be observed that with the arrangement of fluid operated actuating mechanism described a constant pressure from the air line or pump is maintained against the small end or head 84 of the piston. When it is desired to index the turret, the exhaust valve 97 is closed and the inlet valve 92 is opened, whereupon air will flow through the inlet port and the port 91 to the space in front of the large head or end of the piston and this pressure being greater than the pressure exerted against the small end, will cause the piston to move to the right (see Fig. 9) and push the fluid behind the small end of the piston back into the line through the needle valve 101, the check valve now being closed. When the rocking lever 102 is tripped, the exhaust valve opens and the inlet valve is closed, whereupon the air in front of the large head will exhaust through the port 96 and the pipe 98 and the pressure which is always on the small end of the piston, will return the piston to its left, that is, cause it to take an inoperative stroke. It will be observed that by adjusting the needle valve the speed of the piston may be very nicely controlled. The more the needle valve is opened the faster the air will get out of the small end of the cylinder and, therefore, the faster the machine will index. The pinion 85 with which the rack bar 82 cooperates is located in the space between the two pistons and which space is free of fluid pressure. The shaft 110 which carries the gear 85, may therefore extend through the side wall of the casting comprising the cylinders 80 and 81 without the requirement of any stufiing boxes or the like.

Referring now to the driving connection between the fluid operated actuating means and the turret, the pinion 85 is carried by a shaft 110 to the right-hand end of which is fixed a pinion 111 meshing with a large ring gear 112 which surrounds a small end of the turret, as will be seen most clearly from Figs. 8 and 10. This ring gear is free to revolve relative to the turret and carries a stud 113' on which is pivotally mounted a pawl 113 which is adapted to cooperate with a plurality of angularly spaced apart dogs 114 fixed to the periphery of the turret, three such dogs being shown in the present instance. For the purpose of accurately and securely holding the turret in each of its indexing positions, there is fixed to the turret a ring 115 having in its periphery three equally spaced notches 116 which are adapted to selectively receive a lock bolt 117 mounted for vertical movement in the top of the tool slide. This lock bolt is normally urged into the engaged position shown in Figs. 8 and 10 by a spring 118. The bolt carries a roller 119, and the pawl 113 has an inclined flange or cam 120 adapted to engage the roller and raise the lock bolt out of the notch in which it engages upon initial movement of the ring gear in a direction to index the turret.

It will be seen that with the arrangement just described when air is admitted to the forward end 'of the large cylinder the piston will move rearwardly on its operative stroke and turn the ring gear clockwise from the position shown in Fig. 10. When the ring is thus rotated, the flange or cam portion 120 of the pawl 113 will engage and ride under the roller 119 thereby raising the lock bolt from looking position and upon further rotation of the ring gear the forward end of the pawl will engage one of the dogs 114 so that the ring gear and turret will rotate as a unit through 120. When this indexing movement is completed, a trip, hereinafter described more in detail, is brought into play to open the exhaust valve 97 and close the intake valve 92, whereupon the piston will move forwardly and rotate the ring gear (without rotating the turret) counterclockwise back to the position shown in Fig. 10. As the ring gear moves counterclockwise, the flange of the pawl will ride over the roller 119.

As previously stated, the trip shaft 39 is rocked in one direction (clockwise with reference to Fig. 9 and counterclockwise with respect to Fig. 10) by the trip 35 associated with the cam 22 for moving the tool slide. Fixed to this shaft, beneath the forward end of the fluid operated actuating means, is a trip lever 125 having a wedge-shaped or bevelled nose 126 with which is adapted to cooperate a roller 12'? carried by a plunger 128 located in a rocking arm 129 pivoted to the slide 12, as at 130. Behind the plunger is a spring 131. 59

The rocking arm 129 is connected by a link 132 to the rocking valve operating lever 102. It will be understood that as the tool slide 19 approaches its inoperative or withdrawn position, the trip 35 will rock the trip shaft in a direction to disengage the clutch 34 and to cause the trip lever 125 to swing rearwardly, referring to Fig. 9. When the trip lever so moves, it compresses the spring 131 until after the nose of the trip lever has ridden past the roller 127, whereupon the spring will cause the arm 129 to swing forwardly and thereby move the rocking lever 102 so as to close the outlet valve and open the inlet valve. The piston will now move on its operative stroke and index the turret as previously described. The turret having been brought to indexed position, it is now necessary to return the piston to the position shown in Fig. 9 and to throw on the clutch 34 so that another cycle of movements will be effected. The means for doing this includes a pinion 135 journalled in the slide 12 and meshing with the ring gear 112. This pinion carries a pin 136 adapted to cooperate with an arm 137 fixed to the trip shaft 39. In the present instance, this arm is held in operative relation to the trip shaft by means of a spring 138 sothat in the event anything should go wrong the parts would not jamb and cause injury. Now when the trip shaft is tripped by the trip 35, the

arm 137 will be moved to the dotted line position shown in Fig. 10 and, during the indexing movement of the ring gear the pinion 135 will be rotated counterclockwise. As the ring gear completes its indexing movement, the pin 136 will wipe against the arm 137, thereby moving the 'arm back to the full line position shown in Fig.

10 so that the trip shaft is turned counterclockwise with respect to Fig. 9 to the position shown in that figure which means that the intake valve is closed and the outlet valve is opened and the clutch 34 is engaged. The piston will now return to the inoperative position shown in Fig. 9 andthe tool spindles will complete their cycles of ,movements. When that cycle is completed, the trip 35 is again operated, with the result that the tool slides will stop in their withdrawn positions and the turret will be given another indexing movement.

As many changes could bemade in the above construction and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the language used in the following claims is intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

We claim as our invention:

1. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality erating means, a plurality of reversible electric motors indexible with said turret and corresponding in number to said chucks with which they are respectively associated, a driving connection between each motor and its respective chuck operating means, means for energizing each of said motors when the chuck associated therewith is at loading position, and means for manually reversing said motor when so energized.

3. In a chucking machine, a turret mounted for indexing movement about its axis, means for indexing said turret, a plurality of work holding chucks secured to the turret and adapted to be successively moved to a plurality of stations, a plurality of electric motors secured to said turret and corresponding in number to said chucks and respectively associated therewith, a driving connection comprising a reversible screw extending between each motor and its respective chuck, means for energizing each motor when the chuck with which it is associated is at loading position, and means for controlling the direction of rotation of said motors, when so energized.

4. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of angularly spaced apart chucks mounted thereon a like distance from the axis of said turret and adapted to be successively brought to a plurality of stations, one of said stations being a loading station, a plurality of motors secured to the turret and corresponding .in number to and respectively associated with said chucks for opening and closing the same, a reversible screw connection extending between each motorand its associated chuck, means for energizing each motor only when the chuck with which it is associated is at loading position, and means for controlling the direction of rotation of the motor when so energized.

5. In a chucking machine, a turret mounted for indexing movement about its axis, a plural ity of angularly spaced apart work holding chucks carried by said turret and adapted to be successively brought to a plurality of stations, at plurality of motors carried by said turret one for each chuck and operatively connected therewith, each of said motors being provided with terminals, and contacts positioned at one of said stations and with which said terminals are adapted to be brought into engagement when a motor is brought to that station.

6. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of angularly spaced apart work holding chucks carried by said turret and adapted to be successively brought to a plurality of stations, a plurality of motors indexible with said turret one for each chuck and operatively connected therewith, each of said motors being provided with terminals, contacts positioned at one of said stations and with. which said terminals are adapted to be brought into engagement when a motor is brought to that station, and a switch associated with said contacts.

7. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of angularly spaced apart work holding chucks carried thereby, a plurality of motors carried by said turret and indexible therewith, each of said motors having a motor shaft axially aligned with a respective chuck, and a driving connection com- 8. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of chucks mounted thereon so as to be indexible therewith and adapted to be successively brought to a plurality of stations, each of said chucks having operating means including a rotatable element, a plurality of motors supported by said turret so as to be indexible therewith and respectively associated with said chucks, each motor having a motor shaft axially aligned with said rotatable element of its corresponding chuck, a driving connection between each motor shaft and its associated rotatable element, and means for energizing each of said motors when its respective chuck is in loading position.

9. In a chucking machine, a turret mounted for indexing movement about its axis, means for indexing said turret, a plurality of work holding chucks fixed to one end of said turret, a plurality of reversible electric motors fixed to the other end of said turret and corresponding in number to said chucks with which they are respectively associated, a driving connection within the turret between each motor and its respective chuck operating means, means for automatically energizing each of said motors when the chuck with which it is associated is at loading position, and means for manually reversing the direction of rotation of said motor when so en ergized.

10. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of angularly spaced apart chucks mounted on the forward end of said turret at like distances from the axis thereof and adapted to be successively brought to a plurality of stations, one of said stations being a loading station, a plurality of motors secured to the rear end of said turret and corresponding in number to and respectively associated with said chucks for opening and closing the same, and means for con trolling the direction of rotation of each motor when its associated chuck is at the loading station.

11. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of angularly spaced apart work holding chucks secured to the forward face of said turret and adapted to be successively brought to a plurality of stations, and a plurality of motors secured to the rear end of said turret one for each chuck and operatively connected therewith, each of said motors having a motor shaft the rear end of which is exposed and squared.

12. In a chucking machine, a plurality of parallel spaced apart tool spindles, a turret indexible about an axis parallel to said tool spindles, means for moving said spindles towards and away from said turret, a plurality of angularly spaced apart work holding chucks fixed to the forward end of said turret in opposed relation to said spindles, means for indexing said turret to bring each chuck successively into alignment with said spindles and to a loading position, a plurality of reversible electric motors secured to the rear end of said turret and respectively associated with said chucks, and means for controlling said motors at the loading station.

13. A fluid operated actuating mechanism including a pair of aligned cylinders having bores of different cross sectional areas and opening one into the other, the remote ends of said bores being closed, a piston slidably mounted in each bore, a member connecting said pistons whereby the same move in unison, a pressure line, means for admitting fluid from the pressure line to the larger bore in front of the piston therein, means for permitting the fluid to exhaust from the larger bore, said pressure line being connected to the smaller bore behind the piston therein, means for preventing an unrestricted flow of the fluid from the smaller bore back to the line, and adjustable means for regulating the flow of the fluid from the smaller bore back into the line.

14;. A fluid operated actuating mechanism including a pair of aligned cylinders, the adjacent ends of the bores of which communicate and the remote ends of which are closed, a piston in each of said bores, one of said pistons being of larger effective area than the other one, means for connecting said pistons together whereby they move in unison, a pressure line leading to the closed end of the bore containing the smaller piston, means for admitting fluid pressure from the line to the closed end of the cylinder containing the larger piston, means for permitting the bore in which the larger piston is mounted to exhaust, a check valve in the line leading to the smaller bore, a passage from the bore containing the smaller piston and lay-passing said check valve, and an adjustable valve in said passage for regulating the flow of the fluid from the smaller bore back into the line.

15. In a chucking machine, an indexible turret, a plurality of work holding chucks carried thereby, fluid operated actuating mechanism for indexing said turret, and a driving connection between said mechanism and said turret through which the latter is indexed; said fluid operated actuating mechanism including a pair of aligned cylinders transversely arranged with respect to the axis of the turret and having bores of unequal cross sectional area, a piston slidably fitted within the larger bore, a piston of less effective area slidably located in the smaller bore, a rackbar connecting said pistons, means to admit fluid to the larger bore in front of the piston therein, means for permitting the fluid to exhaust from the larger bore, a fluid pressure 'line connected to the smaller bore behind the piston therein, and adjustable means for regulating the exhaust of the fluid from the smaller bore back to the line; said driving connection including a shaft and a gear on said shaft meshing with said rack bar.

16. In a chucking machine, a pair of parallel slides, a tool spindle in each slide, means for rotating said tool spindles, means associated with one of said slides for reciprocating the same longitudinally, means for adjustably and releasably connecting the last mentioned slide with the other one whereby said slides may be moved in unison by said reciprocating means, and means for locking said last mentioned slide in fixed position.

17. In combination, a chuck, operating means therefor having a rotary element, a reversible motor having a shaft, and a lost motion connection between said motor shaft and rotary element and comprising a succession of rotary elements each having a limited rotary movement relative to the next succeeding one, the relative rotary movement between successive elements being accumulated upon reversal of direction of rotation of the motor.

18. In combination, a chuck, operating means therefor having a rotary element, a reversible electric motor having a shaft, and a lost motion connection between said motor shaft and rotary element and comprising a succession of rotary disks positioned end to end, adjacent disks having cooperating lugs whereby each disk is adapted to drive the succeeding one, the lug of each disk having a relative angular movement with respect to its cooperating one upon reversal of direction of the motor whereby the angular relative movements between the succeeding disks are accumulated.

19. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of chucks secured thereto so as to be indexible therewith and adapted to be successively brought to a plurality of stations, each of said chucks having operating means including a rotatable shaft section, a plurality of motors secured to said turret so as to be indexible therewith and having shafts respectively aligned with said shaft sections, and a lost motion connection between each motor shaft and its associated shaft section.

20. In a chucking machine, a turret mounted for indexing movement about its axis, a plurality of chucks secured to one end of said turret so as to be indexed therewith and adapted to be successively brought to a plurality of stations, each of said chucks having operating means including a rotatable shaft section, a plurality of reversible electric motors secured to the other end of said turret so as to be indexible therewith and respectively associated with said chucks, each motor having a shaft axially aligned with the shaft section of its corresponding chuck, and a driving connection between each motor shaft and its associated shaft section comprising a succession of rotary elements each having a limited rotary movement relative to the next succeeding one.

21. In a chucking machine, a base having on its upper surface two sets of ways disposed at an angle to each other with one set of ways facing the other set, spindle slides mounted on the respective sets of ways, a tool spindle on each slide, means for revolving said tool spindles, and means for longitudinally moving at least one of said slides.

HARRY J. HAUCK. STANLEY T. GOSS.

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