US2035354A - Stock feeding and gripping device - Google Patents

Description

Mamh 24, 1936..

J. J. N. VAN- HAMERSVELD STOCK FEEDING AND GRIPPING DEVICE Filed July 26, 1954 4 Sheets-Sheet kl Y MMM/vies Search Hoon March 24, 1936. J. J. N, VAN HAMERSVELD 2,035,354

` STOCK FEEDING AND GRIPPING DEVICE Filed July 26, 1934 4 Sheets-Sheet 2 4free/vers Search Hoorn J. .1. N. VAN HAMERSVELD 2,035,354

STOCK FEEDING AND GRIPPING DEVICE Filed July 26, 1934 4 Sheets-Sheet 3 @Man/fa Sffln NOON March 24, 1936' J. J. N. VAN HAMERSVELD 2,035,354

STOCK FEEDING AND GRIPPING DEVICE Filed July 26, 1934 4 Sheets-Sheet 4 OLEZ.

UNITED STATES Search Hooi.

PATENT OFFICE STOCK FEEDING AND GRIPPING DEVICE John J. N. Van Hamersveld, Cleveland Heights,

Ohio, assignor to The Warner & Swasey Company, Cleveland, Ohio, a corporation of Ohio Application July 26, 1934, Serial No. 737,075

24 Claims.

This invention relates to a stock feeding and gripping device adapted to be used in connection with a machine wherein bar or rod stock must be intermittently fed in predetermined lengths and then gripped during the working operation, such as for example a turret lathe.

An object of the invention is to provide a stock feeding and gripping device wherein the stock gripping mechanism is manually controlled by the operator and such mechanism in turn controls the actuation of the stock feeding mechanism.

Another object is to provide a stock feeding and gripping device, wherein the means for restoring the gripping mechanism of the device to stock gripping position after the stock has been fed is manually controlled by the operator and in turn controls the restoration of the stock feeding mechanism to its initial position.

Another object is to provide a stock feeding and gripping device which is manually controlled, but power operated.

Another object is to provide a stock feeding and gripping device which is manually controlled to release the stock gripping means and actuate the stock feeding means and which is also manually controlled to restore the stock gripping means and the stock feeding means, said means in each instance being power operated.

Another object is to provide a stock feeding and gripping device wherein the actuation of the stock gripping means and the stock feeding means and the actuation of the means for restoring the gripping means and feeding means may be manually controlled by a single control element.

A further object is to provide a stock feeding and gripping device which in operation will accurately feed the stock in predetermined lengths.

A still further object is to provide a stock feeding and gripping device which is eiicient in operation, is readily controlled, is positive and possesses a wide range of flexibility.

Additional and further objects and advantages, not specifically enumerated above Will become apparent during the detailed description of two embodiments of the invention which are to follow and which are illustrated in the accompanying drawings, wherein Fig. 1 is a fragmentary side elevational view of a turret lathe equipped with one form of stock feeding and gripping device embodying the present invention, certain portions of the head of the turret lathe being broken away and the spindle and its associated parts being shown in section.

Fig. la is a fragmentary Section of a stock feeding slide.

Fig. 1b is a fragmentary section of the slide that is connected to the wedge cone.

Fig. 2 is a top plan view of Fig. 1.

Fig. 3 is an enlarged fragmentary sideelevational view of the turret lathe and stock feeding and gripping device shown in Fig. 1, a certain portion of the stock feeding and gripping device being shown in section.

Fig. 4 is a view similar to Fig. 3, but shows the control lever and the operative parts of the stock feeding and gripping device in another position from that shown in Fig. 3.

Fig. 5 is a transverse vertical section taken substantially on the irregular line 5 5 of Fig. 4, looking in the direction of the arrows.

Fig. 6 is a view similar to Fig. 3, but is taken from the rear side of the machine.

Fig. '7 is a view similar to Fig. 4, but is taken from the rear side of the machine.

Fig. 8 is a horizontal sectional view taken substantially on line 8-8 of Fig. 6 looking in the direction of the arrows.

Fig. 9 is a view similar to Fig. 3, but illustrates a different form of stock feeding and grippin device embodying the present invention.

Fig. 10 is a. view similar to Fig. 9, but shows the control lever and its associated parts of the stock feeding and gripping device in another position from that shown in Fig. 9.

Referring to Figs. 1 to 8, inclusive, disclosing one form of device embodying the present invention and particularly to Figs. 1 and 2, the turret lathe is shown as having a bed I5 and a head I6. A spindle I1 is rotatably mounted in the head I6 in the usual manner as will be well understood, said spindle having slidably arranged therein a collet actuating sleeve I8, the rear or outer end of which extends beyond the end of the spindle I1 and is acted upon by engaging portions of pivoted fingers I9.

When said fingers I9 are spread apart, it Will be understood that the collet actuating sleeve I8 is moved inwardly of the spindle I1 and in turn moves a collet 20 to cause the same to grip the stock, as is well understood. A wedge cone 2| is slidably mounted upon the spindle I1 exteriorly of the head I 6 and is for the purpose of spreading the pivoted fingers I9 to cause the collet 20 to grip the stock. The structure thus far described is conventional and forms per se no part of the present invention, although, as will later be seen, it cooperates with and is acted upon by the stock feeding and gripping device of the invention.

A stock feeding tube 22 extends into the spindle and the collet actuating sleeve |8 and is provided at its inner end with spring fingers for holding the stock in the conventional manner. The outer end of the feed tube 22 is provided with spaced fianges between which lie the rollers of a feeding tube operating lever later to be referred to. A bracket 23 is secured to the end of the head and has pivotally mounted thereon a wedge cone operating lever 24, said lever being provided at its upper end with a forked portion carrying rollers engaging in the groove in the wedge cone 2| and at its lower end with an elongated slot 25, for a purpose later to be referred to.

For the purpose of facilitating assembly the lever 24 is illustrated herein as having a bearing portion extending through the bracket and two arms secured to said bearing portion and forming the forked portion of the lever, one of the arms having a portion extending downwardly and provided with the slot 25.

Below the pivotal connection of the lever 24 to the bracket 23 there is rotatably supported by the bracket a shaft 26 extending into the head and operatively connected to a constant speed driving element of the head, or to an independent constant speed driving element which may be located exteriorly of the head. The shaft 26 carries a worm 21 arranged in a cutaway portion of the bracket 23. The bracket 23 below the worm 21 is provided with a bore extending therethrough and having an annular centrally arranged groove communicating therewith, said bore rotatably supporting a ratchet sleeve 28 and the hub of a worm wheel 29 keyed to said sleeve, the worm wheel being housed in the groove, as clearly illustrated in Fig. 5, and being supported by the walls of the bore and the groove.

The ratchet sleeve 28 is provided at each of its ends with circular bearing portions having a circumferential series of ratchet teeth 30 thereon extending part of the width of the bearing portions. Discs 3| and 32 are arranged on the bearing portions at the opposite ends of the sleeve 28 and rotate freely on said portions and over the ratchet teeth, the discs being held in position by plates 33 secured to the sleeve 28 and having their circumferential edges extending into recesses formed in the disc, as clearly illustrated in Fig. 5.

As previously stated when the machine is operating the worm 21 is being driven at a constant speed and hence the worm wheel 29 and ratchet sleeve 28 and the plates attached thereto are also being continuously driven at a constant speed. In order to clutch the discs 3| and 32 to the ratchet sleeve 28 for rotation therewith, the discs are provided with slots 34 in which are pivotally mounted pawls 35 having on one side of their pivot hooked portions which may engage the ratchet teeth and on the opposite side thereof extended portions projecting through the slots 34 and radially outwardly of the discs. The pawls 35 are urged to ratchet teeth engaging position by means of spring pressed plungers 36 located in recesses formed in the discs 3| and 32. It will be noted that the pawls 35 are each provided with a heel that abuts the straight wall of the slots 34 when the pawls are in fully disengaged position with respect to the ratchet teeth, see Fig. 3.

'I'he disc 3| is provided with a pivoted shoe 31 working in the slot 25 of the lever 24 and operatively connecting said lever with the disc 3 The disc 3| is provided with a cam 38 projecting beyond the circumference of the disc and located on the inner side of the disc substantially diametrically opposite to the pawl 35. The rear disc 32 substantially diametrically opposite to the pawl 35 carried thereby has a shoulder bearing pin 38 swivelly connected thereto on its rear side, which in turn is connected to a rod 43, the function of which will later be explained.

'I'he bracket 23 on its front side has pivotally mounted thereon a stop lever 4|, the lower end of which is provided with a hooked portion, and a second stop lever 42, the lower end of which is straight, said stop levers being arranged on opposite sides of the disc 3|. The stop levers 4| and 42 are interconnected by a link 43 so that the stop levers 4| and 42 will at all times move in unison, the link 43 being extended and pivotally connected to the control lever 44 mounted on the front side of the head |6 where it is within easy reach of the operator.

The control lever 44 is provided with an upwardly extending portion 44 which abuts stops 45 arranged on the supporting plate to limit the movement of the lever in opposite directions, it being understood that suitable spring detents or other means may be employed to hold the control lever in its different positions.

The bracket 23 on its rear side and in alignment with the stop levers 4| and 42, has pivotally secured thereto stop levers 46 and 41, the lever 46 being provided at its lower end with a hooked portion 46a and with a portion 46b extending toward the front of the machine and in the path of the cam 38 of the disc 3|, while the lever 41 at its lower end is straight and is provided with a portion 41 also extending toward the front of the machine and into the path of the cam 38, see Fig. 8. The levers 46 and 41 are interconnected by a link 48 so that they will move in unison at all times, it being noted that suitable stops 48 are provided on the bracket 23 to limit the movement of the levers in opposite directions, it being understood that the levers 43 and 41 may be held in their extreme position by suitable spring detents, as is well understood in the art.

A rod 5|) is connected to the bracket 23 and extends between the head and a stock stand 5|, said rod being provided on its upper side with an elongated slot in which is slidably mounted a ratchet bar 52 having a ratchet tooth portion and a plain portion, the latter portion of the bar being provided, at the end thereof adjacent the machine, with a recess forming abutting shoulders 52ik and 52h, see Figs. 3 and 4. A slide 53 embraces the rod 50 and the ratchet bar 52 bebetween the abutment shoulders 52Il and 52h, said slide having an upwardly extending shoe engaging in the groove of the wedge cone 2|, whereby the slide 53 will move with the wedge cone 2|.

A second rod 54 is arranged below the rod 50 and extends from the bracket 23 to the stock stand 5|. The rod 54 carries a supporting block 55 xed thereto and upon which is pivotally mounted a lever 56 having at its upper end a forked portion carrying rollers which lie between the flanges at the rear end of the feed tube 22. 'Ihe lower end of the lever 56 carries a shoulder pin swivelled therein, said pin being provided with an opening through which the rod 40 extends. On opposite sides of the pin, through which the rod extends, the rod carries a fixed stop 51 and an adjustable stop 58. A slide 59 is mounted on the rod 50 and embraces the ratchet tooth portion of the ratchet bar 52 and has a downwardly extending portion 60 straddling the rod 54 and maintaining the slide 59 in an upright position. The slide 59 is provided with an upwardly extending portion forming a head 6| in which is rotatably secured a vise 62 having means for clamping the stock, which means may be of any suitable form, as is well understood in the art. The slide 59 is further provided with an upwardly extending portion carrying at its upper end an arm 63 which supports the end of a pivoted and sliding stock housing tube 64, said arm 63 being provided with a suitable latch 65 for locking the stock housing tube 64 in axial alignment with the spindle of the machine and connecting said tube to the slide 59 to move therewith.

The slide 59 carries a rocking pawl 66, (see Fig. 1*) adapted to cooperate with the ratchet teeth of the ratchet bar 52 when said bar moves in one direction to cause the bar and slide to move together, said rocking pawl being provided with a counterweighted handle 66 having an extended portion 66, which, when the handle 66* is swung to rock the pawl to an inoperative position, may be engaged by a locking screw 61 to hold the handle and pawl in an inoperative position.

The operation of the stock feeding and gripping device shown in Figs. 1 to8 inclusive, will now bc explained; rst, with reference to the usc therewith of a feed tube and then with reference to the use thereof without a feed tube and with a sliding stock holding head.

Assuming the pawl 66 to be locked in an inoperative position and stock to have been mserted into the feed tube and the spindle and that a complete piece of work has been severed from the stock, the operator swings the control lever 44 from the position shown in Fig. 3 to that shown in Fig. 4. This movement of the control lever swings the stop levers 4| and 42 from the position shown in Fig. 3 to that shown in Fig. 4, thus causing the lever 42 to move off of the pivoted pawl 35 of the disc 3| and allow said pawl to be urged under spring action into engagement with the ratchet teeth 30 on the ratchet sleeve 28. It being assumed that the worm 21 and worm wheel 29 are being driven at a constant speed, it will be seen that as soon as the pawl 35 comes into engagement with the ratchet 3|) the ratchet sleeve 28 and disc 3| will rotate in unison. 'I'his movement of the disc 3| imparts a rocking movement to the lever 24 such that the wedge cone 2| is moved from between the fingers |9 and the collet 2D releases its grip upon the stock. 'Ihe movement of the disc 3| in unison with the ratchet sleeve 28 continues in this instance for a half turn and is then stopped since the extended portion of the pawl 35 comes into engagement with the hook at the end of the stop lever 4| and thus rocks the pawl 35 out of engagement with the ratchet teeth 30.

During the latter part of the rotation of the disc 3| through a half turn, the cam 38 carried thereby is brought into engagement with the portion 41 of the stop lever 41 at the rear of thn machine, (see Fig. 8) and swings said lever 41 outwardly thus disengaging it from the pawl 35 carried by the rear disc 32. The pawl 35 of the rear disc is now urged into ratchet tooth engagingposition by spring action whereupon the ratchet sleeve 28 and the disc 32 rotate in unison, such rotation continuing for a half turn or until the pawl 35 on the disc 32 comes to rest on the hook portion 46Il of the stop lever 46. The rotation of the disc 32 through a half turn moves the rod 40 rearwardly and rocks the lever 56 to move the feed tube 22 in a stock feeding direction, inwardly of the spindle and thus positions a predetermined length of stock outwardly of the collet 20.

The parts being now positioned as shown in Figs. 4 and 7 and it being necessary to cause the collet to again grip the stock and to restore the feed tube 22 to its normal position, the operator swings the control lever 44 from the position shown in Fig. 4 to that shown in Fig. 3. This movement of the control lever 44 causes the hooked end of the stop lever 4| to move from beneath the pawl 35 carried by the disc 3|, thus allowing the said pawl to be urged into ratchet tooth engaging position, whereupon the ratchet sleeve 28 and the disc 3| will rotate in unison for a. half turn or until the pawl 35 cornes into engagement with the lower end of the stop lever 42, as shown in Fig. 3, it being understood that the movement of the stop lever 4| disengages its hooked end from the pawl 35 and moves the a lever 32 into position to engage the pawl 35, as they are interconnected by the link 43. The pawl 35 on the disc 3| is now disengaged from the ratchet teeth and the rotation of the disc 3| ceases, it being noted however, that when the with the extended portion 46b of the rear stop lever 46 (see Fig. 8) and rocks said stop lever to disengage the hook portion 46* thereof from its engagement with the pawl 35 carried by the disc 32, as shown in Fig. 7. As soon as the hooked portion 46 of the stop lever 46 has become disengaged from the pawl 35, the latter engages, under spring action, the ratchet teeth 30, whereupon the sleeve 28 and disc 32 rotate in unison for a half turn or until the pawl 35 engages the lower end of the stop lever 41 which has been moved into the path of the pawl, since the stop levers 46 and 41 are interconnected by the link 48. When the pawl 35 engages the lower end of the stop lever 41, it is disengaged from the ratchet teeth 30 and the rotation of the disc 32 ceases.

The movement of the disc 32 through a half turn moves the rod 40 toward the head of the machine, thus rocking the lever 56 to move the feed tube rearwardly from the position shown in Fig. '1 to its former position, as shown in Fig. 6, it being understood that the spring fingers at the inner end of the feed tube slide over the stock during the rearward movement of the tube.

The xed stop 51 and the adjustable stop 58 have been shown herein as in abutting relation with the headed pin carried by the lower end of the lever 56 (see Figs. 6 and 7), such position being the one for imparting the maximum feed to the stock. When it is desired to vary the feed imparted to the stock by the movement of the feed tube rearwardly, the adjustable stop 58 may bc positioned in spaced relation to the fixed stop 51 and the headed pin cn the lever 56, so that the rotation of the disc 32 through a half turn will have been partially completed before the stop 58 engages the headed pin during that portion oi the operative cycle wherein the feed tube is moved rearwardly after the collet has again gripped the work. It will be seen that in this way the rearward position of the feed tube may be varied, which in turn will vary the length of the forward movement imparted to the stock by the feed tube as the latter moves forwardly.

It will be seen that the movement of the disc 32 is always the same, that is, a half turn and that the rod 40 always moves a predetermined distance. Therefore, the feeding of the stock in accurate predetermined lengths is controlled by the position of the stop 58.

When it is necessary to insert a new length of stock into the spindle the feed tube 22 is moved inwardly of the spindle into its innermost position, after which the stock is passed through the stock housing tube 64 and the vise 62 and into the feed tube until the end of the stock abuts the spring fingers at the inner end of the feed tube. The jaws of the vise 62 are then brought into holding or clamping engagement with the stock, after which the feed tube is moved rearwardly by the mechanism, previously explained, so as to cause the spring fingers to spread apart and to ride upon the stock. When this has been accomplished the jaws of the vise 62 are again loosened to remove their hold upon the stock. If small diameter stock is being worked upon the slide 59 and housing 64 connected thereto may be moved inwardly toward the end of the feed tube so that there will be no portion of the stock unsupported which, during the operation of the machine and the rotation of the stock, would have a tendency to whip.

When the stock feeding and gripping device is employed without the feed tube and with a slidable stock holding head, the stop 58 is moved to the extreme end of the rod 4D, while the pin is withdrawn from the pivotal connection to the lever 56 with the block 55 and said lever is swung downwardly out of engagement with the feed tube 22. The feed tube is then withdrawn from the spindle, after which the lever 56 may be swung upwardly again and the pin replaced. l The stock is positioned in the stock housing 64 and the housing then swung into alignment with the spindle and locked therein by the latch 65. The stock is then pushed forwardly through the bore in the head 6| and the vise 62 and into the spindle through the collet, which, of course, must be open to permit the stock to pass therethrough. The jaws of the vise 62 are then brought into engagement with the stock, while the screw 61 in the slide 59 is positioned so that the rockable pawl 66 and the counterweighted handle 66'- may move freely to an operative position. Assuming the collet 20 to have been closed and a finished work blank to have been severed from thestock, the operator swings the control lever 4I from the position shown in Fig. 3 to that shown in Fig. 4. This movement of the control lever causes the disc 3| to move through a half turn, as has been previously explained in the operation of the device shown using a feed tube. The movement of the disc 3| rocks the lever 24 to move the wedge cone 2| to collet releasing position. The wedge 'cone 2| will have moved to collet releasing position by the time that the inner end of the slide 53, which moves with the wedge cone has engaged the abutment shoulder 52h, with the result that the remainder of the movement of the wedge cone 2| and the slide 53 causes the ratchet bar 52 to move toward the head end of the machine until the end of the ratchet bar abuts the boss on the bracket 23 in which is fastened the rod 50. The movement of the ratchet bar 52 toward the head end of the machine effects a similar movement of the slide 59, it being understood that the pawl 66 is in engagement with the ratchet teeth of the bar. Of course, the movement of the slide 59 effects a movement of the stock which is held by the jaws of the vise 62 an equal distance and also a movement of the stock housing tube 64. Stock stops may be arranged en the turret or other parts of the machine to vary the length of feeding movement imparted to the stock, it being noted that the rack 52 will be moved by the-slide 53, the spring pressed plunger 53, see Fig. 1b, of which is in engagement with the abutment shoulder 52b until the stock engages the stock stop, after which time the stock, slide 59 and rack bar 52 will be held from movement, but further movement will be permitted the slide 53, since the plunger 53 is pushed inwardly of the slide 53 against the action of the spring 53h. It will thus be seen that accurate feeding of the stock is always obtainable and that it will make no difference if the rockable pawl 66 is not in full engagement with a ratchet tooth of the bar 52 when said bar is returned to its initial position. The parts now being in the position shown in Fig. 4 and the stock having been fed through the collet the desired length, the operator moves the control lever 44 from the position of Fig. 4 to that of Fig. 3. This movement of the control lever eects a half turn of the disc 3| in the manner previously described when the device is used with a feed tube and hence causes a movement of the lever 24 and wedge cone 2| from the position shown in Fig. 4 to that shown in Fig. 3.

The movement of the wedge cone 2| causes the collet to again grip the work and also acts to bring the outer end of the slide 53 into engagement with the abutment shoulder 52 and thus eiect a rearward movement of the ratchet bar 52, the rockable pawl 66 simply riding over the teeth of the ratchet bar during such rearward movement. These operations may be continued until the slide 59 has been moved step by step to a point closely adjacent the end of the spindle when it is necessary to release the jaws of the vise 62 from their holding engagement with the stock and then move the slide 59 rearwardly toward the stock stand 5| until it is in the position shown in Fig. 1, after which the jaws of the vise 62 are again brought into holding engagement with the stock. It will be understood that when the device is operating without a feed tube, as just explained, the rear disc 32 will rotate through half turns in the same manner as it does when the feed tube is being employed. Since the adjustable stop 58 has been positioned at the end of the rod 40, such movements of the disc 32 will cause an idle sliding movement of the rod 40 through the headed pin carried by the lower end of the lever 56 without imparting any movement to said lever.

In the embodiment now about to be described and disclosed in Figs. 9 and 10, the wedge cone 2| is moved manually by means of a control lever 68 mounted on the front of the head and connected to a rockable shaft extending into the head and having secured thereto an arm 69 which, in turn, is pivotally connected toa link 16 that is pivotally connected to the lower end of a lever 1|, which is pivotally mounted on the bracket 23 and has at its upper end a forked portion provided with rollers engaging in the groove of the wedge cone 2|. The arm of the forked portion of the lever 1| that is at the front of the machine is provided below the pivot of the lever with a downward extension 12 for a purpose later to be explained.

As in the previously described forms, a shaft 26 having a worm 21 is rotatably mounted in the bracket 23 and is driven at a constant speed, as previously explained, the worm 21 meshing with a worm wheel 29, as previously explained. In the present form, however, the rear disc 32 is omitted and only the front disc 3| is mounted on the ratchet sleeve 28. The disc 3| carries the pawl 35 which has the hooked portion engaging the ratchet teeth 30 of the sleeve 28 and the outwardly extending portion which engages the stop levers 4| and 42. 'I'he stop levers 4| and 42 are interconnected by a link 13 which is provided with abutting pins 13B and 13b, against which the extended portion 12 of the lever 1| abuts. 'I'he disc 3| on its front side is provided with a shoulder pin 14 which is swivelly connected to a rod 15 similar to the rod 40 and carrying a fixed stop 51 and an adjustable stop 58. The rod 15 extends through an opening in a swivelly mounted headed pin at the lower end of the lever 56, the stops 51 and 58 being arranged on opposite sides of said headed pin, see Figs. 9 and 10. As in the previous form the lever 56 is pivotally mounted on a block 55 secured upon a rod 54 extending between and secured to the bracket 23 and the stock stand 5|. The upper end of the lever 56 is forked and carries rollers engaging between the flanges on the rear end of the feed tube 52. Above the rod 54 there is a rod 50, as in the previous form, which rod is provided with a longitudinal slot in which is arranged the ratchet bar 52. A slide 53 is arranged on the rod 5U and embraces the ratchet bar 52 between the abutment shoulders 52b and 52a at the opposite ends of the recess in the portion of the ratchet bar having no ratchet teeth, as previously explained. It will be understood that the rod 50 also slidably supports a slide 59 having the portion 60 engaging the rod 54 and the head 6| provided with the vise 62 and the portion having the arm 63 and latch 65, as previously described and as shown in Fig. 1. It will be further understood that the slide 59 is provided with a rockable pawl 66 and the counterweighted handle 66, as shown in Figs. l and 1*.

The operation of the stock feeding and gripping device of the embodiment just described will now be explained when the device is being used with a feed tube. Assuming that a length of stock is in the machine and a completed work blank has just been severed therefrom and the machine is in operation, the parts of the device will be in the position shown in Fig. 9. In order to feed the stock through the collet a predetermined length, the lever 68 is swung from the position shown in Fig. 9 to the position shown in Fig. 10.

This movement of the lever rst moves the wedge cone 2| to a position such that the collet will have released its grip on the stock, at which time the portion 12 of the lever 1| comes into engagement with the abutment pin 13* on the link 13.

The continued movement of the lever 63 then effects a further movement of the wedge cone 2| and a movement of the link 13 to the left, as viewed in Fig. 9. The further movement of the wedge cone 2| moves the rack bar 52 toward the head end of the machine, but the rocking pawl 66 is held in inoperative position and no movement is transmitted to the slide 59, as previously explained.

The movement ofthe link 13 to the left causes the stop lever 42 to move off the extended portion of the pawl 35 and brings the hooked end of the stop lever 4| into the path of said extended portion of the pawl 35. As soon as the lever 42 moves off of the pawl 35 the latter is urged into contact with the ratchet teeth 39, whereupon the sleeve 28 and disc 3| rotate in unison until the extended portion of the pawl 35 engages the hooked end of the lever 4|, as shown in Fig. 10. As previously explained, this movement of the disc 3| is through a half turn and imparts a movement to the rod 15 and through the lever 56 to the feed tube 22 to cause a feeding movement of the latter, it being noted that the fixed stop 51 is in engagement with the headed pin at the lower end of the lever 56 during this movement of the rod 15.

In order to cause the collet to again grip the stock and to restore the feed tube 22 to its original position, the lever 68 is now swung from the position shown in Fig. to that shown in Fig. 9, the first part of said movement bringing the wedge cone 2| sufficiently far between the fingers I9 to close the collet to grip the stock and to bring the portion 12 of the lever 1| against the abutment pin 13b. The remainder of the L movement of the lever 68 moves the wedge cone 2| still farther between the ngers I9 and swings the hook portion of the lever 4| out of engagement with the pawl 35 and the lower end of the lever 42 into the path of the pawl 35. As soon as the hooked end of the lever 4| releases the pawl 35, the latter engages the ratchet teeth 30 and the disc 3| and sleeve 28 rotate in unison a half turn, or until the pawl 35 engages the lower end of the stop lever 32. This movement of the disc 3| causes a movement of the rod 15 toward the head end of the machine and rocks the lever 56 in a direction such that the feed tube 22 is withdrawn from the spindle and restored to its original position, the amount that the feed tube is withdrawn and the resulting length of feed being determined by the position of the adjustable stop 58, as previously explained.

A device of the second embodiment may be operated without a feed tube and with a slidable stock holding head, as heretofore explained, in connection with the first embodiment and with either the worm 21 and shaft 26 idle, or with said parts rotating and the stop 58 on the rod 15 positioned so as not to transmit movement to the lever 56. The feed tube is removed in the manner previously explained, and the stock positioned in the spindle and clamped by the device 62 carried by the slide 59, see Fig. 1. It will be-understood that the movement of the control lever 68 effects a movement of the wedge cone 2|, as already described. and also forward and rearward movements of the ratchet bar 52, as already explained. The forward movement of said bar in turn effecting the forward movement of the slide 59, vise 62, stock housing tube 64 and stock.

While two embodiments of the invention have been illustrated and described herein, it should be understood that the invention is susceptible of various modifications and adaptations within the scope of the appended claims.

Having thus described my invention, I claim:

1. In a stock feeding and gripping device for a machine tool, stockgripping means, means for releasing and closing the gripping means, a manually movable member for controlling said last means, stock feeding means, and independent means operatively released by movement of said member for automatically actuating the last 'named means and for automatically stopping the actuation thereof to feed the stock a predetermined length upon completion of the movement of said member in a direction to eifect a release of the gripping means.

2. In a stock feeding and gripping device, stock gripping means, means for opening and closing said gripping means, a manually movablewmember associated with said la? means" and'cgntrglling the samegwhen moved in opposite directions to eilet, respectively, an opening and closing of the gripping means, stock feeding means, and independent means operatively released by movement of said member for automatically moving the feeding means a predetermined amount to feed the stock upon completion of the movement of said member in a direction to effect opening of the gripping means and for automatically moving the feeding means in the opposite direction upon the completion of the movement of said member to effect a closing of the gripping means.

3. In a stock feeding and gripping device, stock gripping means, stock feeding means, means for operating the gripping means, power means for operating the feeding means a predetermined period and put into operation by said last named means at the end of its operative movement and automatically stopped at the termination of said period, and manually movable means for controlling said rst named means.

4. In a stock feeding and gripping device, stock gripping means, means for operating the gripping means, power means independent of said last named means for operatingm the feeding means a predetermined `period and`"iicl`ding"" means for" automatically stopping the operation thereof at the termination of said period, and manually controlled means for controlling the operation of both of said last named means.

5. In a stock feeding and gripping device for a machine tool, a stock gripping collet, stock feeding means, power means for actuating said collet, independent power means for actuating said feeding means, means associated with said power means for automatically causing the same to effect sequentially an opening of the collet and a stock feeding movement of the feeding means, and a manually movable member for controlling said last named means.

6. In a stock feeding and gripping device for a machine tool, a stock gripping collet, stock feeding means, power means for actuating said collet, independent power means for actuating said feeding means, means associated with said power means for automatically causing the same to effect sequentially gripping of the collet upon the stock and a restoring of the stock feeding means, and a manually movable member for controlling said last named means.

7. In a stock feeding and gripping device for a machine tool, a stock gripping collet, stock feeding means, power means for actuating said collet, independent power means for actuating said feeding means, means associated with said power means for automatically causing the same to effect sequentially a release of the collet from the stock and a stock feeding movement of the feeding means and then a gripping of the collet upon the stock and a restoring of the stock feeding means, and a manually movable member for controlling said last named means.

8. In a stock feeding and gripping device for a machine tool, stock gripping means, stock feeding means, power means for actuating said gripping means, independent power means for actuating said feeding means, a. manually movable member for controlling said power means, and means associated with said power means for automatically causing the same to effect sequentially a, release of the gripping means and a stock feeding movement of the feeding means when said member is moved in one direction.

9. In a stock feeding and gripping device for a machine tool, a stock gripping means, stock feeding means, power means for actuating said gripping means, independent power means for actuating said feeding means, a manually movable member for controlling said power means, and means associated with said power means for automatically causing the same to effect sequentially a closing of the gripping means and a restoring of the stock feeding means when said member is moved in one direction.

l0. In a stock feeding and gripping device for a machine tool, stock gripping means, stock feeding means, power means for actuating said gripping means, independent power means for actuating said feeding means, a manually movable member for controlling said power means, and means associated with said power means for automatically causing the same to effect sequentially a release of the gripping means and a feeding movement of the feeding means when said member is moved in one direction and a closing of the gripping means and a restoring of the feeding means when said member is moved in the opposite direction.

11. In a stock feeding and gripping device, mea-ns for gripping and feeding the stock including a power shaft and an intermittently movable member, means for connecting said member to said power shaft to feed the stock during one of the movements of said member and to restore the stock feeding means during another movement of said member.

l2. In a stock feeding and gripping device, f

means for gripping and feeding the stock including a power shaft and an intermittently movable member, and means for connecting said member to said power shaft to cause a gripping of the stock during one of the movements of said member and a release of the stock during another of said movements.

13. In a stock feeding and gripping device, means for gripping and feeding the stock including a power shaft and an intermittently movable member, and means for connecting said member to said power shaft to release and feed the stock during one of the movements of said member and to grip the stock and restore the stock feeding means during another of said movements.

14. In a stock feeding and gripping device, means for gripping the stock, manual means for actuating said gripping means, means for feeding the stock including a power shaft and an intermittently movable member, and means for connecting said member to said power shaft and controlled by said manual means to feed the stock during one of the movements of said member and to restore the stock feeding means during another of said movements.

15. In a stock feeding and gripping device, stock gripping means, manually movable means for actuating said gripping means, stock feeding means including a. power shaft and an intermittently movable member, means controlled by said manually movable means for connecting said member to said power shaft when said stock gripping means is released to feed the stock during one of the movements of said movable member and when said gripping means is closed upon the stock to restore the stock feeding means during another of the movements of said member.

16. In a stock feeding and gripping device, means for gripping and feeding the stock including a power shaft, a member normally moved by said shaft, means for restraining said member against movement, and means for controlling said restraining means to effect intermittent movement of said member to feed the stock during one movement of said member or to restore the stock feeding means during another movement thereof.

17. In a stock feeding and gripping device, means for gripping and feeding the stock including a power shaft, a member normally moved by said shaft, means for restraining the movement of said member, and means for controlling said restraining means to effect an intermittent movement of said member to cause a gripping of the stock during one of the movements of said member or a releasing of the stock by the stock gripping means during another of said movements thereof.

18. In a stock feeding and gripping device, means for gripping and feeding the stock including a power shaft, members normally moved by said shaft, means for restraining movement of said members, and means for controlling said restraining means to effect intermittent movement of said members to release and feed the stock during one of the movements of said members or to grip the stock and restore the stock feeding means during another of the movements thereof.

19. In a stock feeding and gripping device, means for gripping and feeding the stock including a power shaft, a member normally rotated by said shaft, means for restraining said member against rotation, and means for controlling said restraining means to allow a predetermined rotation of said member to feed the stock and another separate predetermined rotation of said member to restore the stock feeding means.

20. In a stock feeding and gripping device, stock gripping means, stock feeding means, said gripping means and said feeding means including a power shaft, members normally rotated by said shaft, means for restraining said members against rotation, and means for controlling said restraining means to allow a predetermined rotation of said members to release the gripping means and feed the stock and another separate predetermined rotation of said members to close the gripping means and restore the stock feeding means.

21. In a. stock feeding and gripping device, stock gripping means, stock feeding means, said gripping means and said feeding means including a power shaft, independent members normally rotated by said shaft, means for restraining said members against rotation, and cam means carried by one of said members for engaging the restraining means for another of said members to release the same and initiate the rotation of said other member.

22. In a stock feeding and gripping device, stock gripping means, stock feeding means, said gripping means and said feeding means including a power shaft, independent members normally rotated by said shaft, means for restraining said members against rotation, manual means for releasing the restraining means for one of said members to initiate the rotation thereof, and cam means carri-ed by said last named member for releasing the restraining means of another of said members to initiate the rotation thereof.

23. In a stock feeding and gripping device, stock gripping means, stock feeding means, said gripping means and said feeding means including a power shaft, independent members normally rotated by said shaft, means for restraining said members against rotation, manual means for releasing the restraining means f,or one of said members to initiate rotation thereof to release said gripping means, and cam means carried by said last named member for releasing the restraining means of another of said members to initiate the rotation thereof to actuate the stock feeding means.

24. In a stock feeding and gripping device, stock gripping means, stock feeding means, said gripping means and said feeding means including a power shaft, a pair of members normally rotated by said shaft, means for restraining said members against rotation, manual means movable in one direction to release the restraining means for one of said members to initiate the rotation thereof to release the gripping means, cam means carried by said last named member to release the restraining means for the other of said members to initiate the rotation thereof to actuate the stock feeding means, said manual means being movable in the opposite direction to again release the restraining means for said first member to initiate the rotation thereof to close the gripping means, and said cam means carried by said first named member again releasing the restraining means for the second member to initiate the rotation thereof to restore the stock feeding means.

JOHN J. N. VAN HAMERSVELD.

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