US2003152A - Stock feeding and gripping device - Google Patents

Description

May 28, 1935. M. E. LANGE ET AL STOCK FEEDING AND GRIPPING DEVICE Filed July 17;19s4 '7 Sheets-Sheet 1 May 28, 1935. ME. LANGE ET m.

STOCK FEEDING AND GRIPPING DEViCE Filed July 17, 1934 7 Sheets-Sheet 2 mar/mes Max 5 ZH/YEE Mum/v [50:51:

May 28, 1935. M. E. LANGE ET AL 2,003,152

STOCK FEEDING AND GRIPPING DEVICE M. E. LANGE ET AL s'rocx FEEDING AND GRIPPING DEVICE May 28, "1935.

Filed July 17, 1934 '7 Sheets-Sheet 4 May 1935- M. ,E. LANGE ET m. 2,003,152

STOCK FEEDING AND GRIPPING DEVICE I Filed July 17, 1934 7 Sheets-Sheet 5 4: jrrozmsrs May 28, 1935. M. E. LANGE ET AL STOCK FEEDING AND GRIPPING DEVICE Filed July '17, 1934 '7 Sheets-Sheet 6 a w. Hf M May 28, 1935. M. E. LANGE ET AL STOCK FEEDING AND GRIPPING DEVICE Filed July 17, 1934 7 Sheets-Sheet '7 Max Mu/ M E. Inn/5s Patented May 28, 1935 UNITED STATES PATENT OFFICE 2,003,152 srocx rapnnvd AND GBIPPING DE ICE Max E. Lange, Cleveland Heights, and William J. Burger, Shaker Heights, Ohio, assignors to e Warner a Swasey Company, Cleveland, Ohio, a corporation of Ohio Application July 17, 1934, Serial No. 735,704 I 20 Claims. (CI. 29-59) This invention relates to a stock feeding and have been omitted to clearly illustrate the spinripping device adapted to be used upon various die; types of machine tools wherein the stock is in- Fig. 4 is a front elevation of Fig. 3 with the optermittently fed longitudinally to form work crating levers and connected parts positioned in pieces of predetermined length, as for example a the full line showing of Fig.3;

turret lathe and the like. Fig. 5 is a view similar to Fig. 4, except that the An object of the invention is to provide a stock p a g levers a connected Part8 P 6 feeding and gripping device which can be used 'tioned in the dotted line showing of Fig. 3; with a feed tube forfeeding stock of smaller di- Fig. 6 is a side elevational view of a machine meters or can be used without a feed tube and employing a 'diiierent embodiment of the inven- 10 with a movable stock feeding head for feeding, tion from that shown in Figs. 1 to 5, inclusive, stock of larger diameters. .and one wherein the stock feeding and gripping A furtherobject isto provide a stock feeding device acts to feed thestock by means of a mov-' and gripping device which includes means for able stock feeding head in place of the feed tube 5 readily varying the length of the feeding movedisclosed in the first mentioned form. 1 l

' ment'and, therefore, the-length of the work pieces; Fig. 7 is a top plan view of the machine and Another object is to provide a stock feeding stock feeding and gripping device shown in Fig. 6, and gripping device which includes adjustable with the stock housing tube detached from the means that accurately determines the length of stock feeding and gripping device and moved to the feeding movement and the length of the work stock loading position; I v 20 pieces. Fig. 8 is an enlarged fragmentaryelevational Another object is to provide astock feedingand view of a portion of Fig. 6, with certain parts gripping device which is operated by means 'of of the machine omitted to clearly show the spin-' levers and wherein the movement of one lever dleand with certain P s f th Stock feeding in one direction releases the grip of the collet on and gripping devic Shown n S c it being 5 the stock and feeds the stock a predetermined noted that the movable stock feeding head is distance,-the movement of the samelever in the diiferently positioned than in Fig.6;

reverse direction restoring the grip of the collet F g- 9 s a View milar ISO Fig- 8 wi h t e w upon the stock, while movement of another lever ating lever and its connected-parts shown in a 3" acts to restore the stock feeding member to its fl ent position;

initial position. Fig, 10 is a side elevational view of a machine Another object is to provide a stock feeding and y nk S l d fer t embediment of the gripping device that is efficient in operation and invention r m these P i y illustrated an control. 7 one wherein the device may be used with a stock Another object is to provide a stock feeding and feeding e w 8 m va l Stock di 35 gripping device which is simple in construction head;

and direct, positive, flexible and accurate in its Fi 11 is a to! P n View Of 10 wi h he 1 operation. stock housing-tube shown in stock loading po-- Further and additional objects and advantages Sition;

will become apparent hereinafter during the de-. Fig. 12 is an enlarged fra me y a o tailed description which follows of several em- View a Portion certain pa ts 01' the bodiments-of the invention, as illustrated in the machine having been t d o clea y llusaccompanying drawings, wherein trate the spindle and the stock feeding and grip- Fig. 1 is a side elevational view showing a map ng device being shown as ope a with a $11001! chine employing one embodiment of the present feeding tube; v 45 invention and utilizinga feed tube for feeding the i 13 s a Vi w i a o g. 12 with the stock; Y Y operating levers oi the stock feeding and grip-- i Fig. 2 is a top plan view of the machine and ping device and their associated parts shown in stock feeding and gripping device shown in a difierent p i n than in Fi 12; and

Fig. 1; Figs, 14 and 15 are views similar to Figs. 12 50 Fig. 3 is an enlarged fragmentary plan view of and 13, respectively, except that the stock feedthe stock feeding device shown in Fig. 2, the oping and gripping device is not employed with a erating levers of the device being shown in one stock feeding tube butis employed witha movable position in full lines and in another position in stock feeding head.

dotted lines, while certain portions of the machine Referring first to the embodiment of the in- 55 vention shown in Figs. 1 to 5, inclusive, and particularly to Figs. 1 and 2, there is partially shown a turrent lathe comprising a bed 20 and a head 2| extending through which is a rotatable spindle 22. The spindle 22 houses an endwise movable collet operating sleeve 23, see Fig. 3, which when moved in one direction moves a spring-jawed collet 24 into gripping relation with the stock, as is well understood, and when moved in the opposite direction allows said collet to release 'its grip upon the stock. The collet actuating sleeve 23 is moved to cause the collet to grip the stock by means of pivoted fingers 25 having heel portions which engage the ends of the sleeve and being providedwith rollers bearing upon a sliding wedge-operating cone 26 mounted on the spindle 22. A slidable stock feeding tube 21 ex.- tends into the collet actuating sleeve 23 and is provided at its inner'end with the usual stock gripping fingers. The parts thus ,far described are conventional and do not constitute any part of the present invention, except in so far as they cooperate with the various elements of the stock feeding and. gripping device which are operatively associated with the cone 26 and the feed tube 21.

A rod 28 extends from the rear end of the head and is supported by the stock stands, later to be referred to, and also by a bracket 29 secured to the rear end of' the head. The bracket 29 adjacent the rear end of the head carries a vertically extending lever support upon which is pivotally arranged an operating lever 3|] for restoring the feed tube to initial position and an operating lever 3| for actuating the cone 26 and for actuating the feed tube in a stock feeding direction. The lever 38, as will later be explained, has a direct connection with the feed tube for restoring the same to its initial position and the lever 3| has a direct connection with the cone 26 and an operative connection'wlth the feed tube for moving the' latter in a stock feeding direction. The lever 30 is provided with'an extension beyond the'lever support and toward the back of the machine, see Fig. 3; which is pivotally connected at its end to a connecting rod 32, which in turn is pivotally connected to a slide 33 mounted upon the rod 28. The slide 33 is provided with an upwardly extending shoe engaging between flanges formed on the rear end of the feed tube 21, whereby movement of the slide 33 similarly moves the feed tube 21. The lever 3| is provided with 9. lug 34 to which is pivotally connected 'a link 35 in turn pivotally connected to a slide 36 on the rod 28, said slide having an upwardly extending fork carrying rollers engaging in a groove in the wedge cone 26. It will thus be seen that movement of the lever 3| effects a direct andpositive movement of the cone 26.

The lever 3| forwardly of the lug 34 is provided with a second lug 31- which rotatably supports a pin 38 having on the upper side of the lug an enlarged portion 38 through an opening in which a rod 40 slidably extends, said rod being pivotally connected to theslide 33 and carrying on the opposite s e of the pin 38 from the slide 33 an adjustable stop 4|. It will be seen that when the lever 3| is moved from the full lineposition of Fig. 3 to the dotted line position thereof, it will first move the cone 26 to release the, collet 24 from stock gripping position, after'which the enlarged portion of the pin 38 carried by said lever will engage the stop 4|on the rod 40 and cause a movement of the slide 33 and a movement mum movement of the lever 3| of the feed tube 21 to feed the stock through the collet. 4

The movement of the lever 3| from the full line position of Fig. 3 to the dotted line position thereof acts to move the lever 30 from the full line position to the dotted line position, since the lever 30 is connected 'to the slide 33. When the lever 3| is in the position shown in full lines in Fig. 3, the parts of the device are in the position illustrated in Fig. 4, while when the lever 3| is in the position shown in dotted. lines in Fig. 3, the parts are in the position illustrated in Fig. 5. A ter" the lever 3| has been moved, as just described, to release the gripping of the collet and to feed the stock through the collet, this lever is then moved in the reverse direction to cause the collet, through the intermediary of the sleeve 23 and cone 26, to grip the stock, it being noted that the reverse movement of the lever 3| does not effect any movement of the slide 33, since the 40 and does not move the rod. The stock having been gripped by the collet, the lever 30 is now moved away from the dotted line position shown in Fig. 3, to the full line position shown in said figure, whereupon the slide 33 is moved rearwardly or to the left, as viewed in the drawings by the rod 32 and the feed tube restored to its initial position, it being understood that the gripping fingers in the inner end of the feed tube slide over the stock during the movement of the tube.

It will be noted that the stop 4| is adjustable on the rod 40 and that the position of said stop determines the length of travel of the feed tube 21 effected by the movement of the lever 3| and as a result the length of feed of the stock. In this connection it will be noted that the maxifrom left to right, as viewed in the drawings, is determined by the abutting engagement of the forward end of the-slide 38 with the boss 23a of the bracket 29, as shown in Fig. 5. This engagement of the slide 36 with the boss 29a also determines the maximum length of travel of the slide 33 and the feed tube 21, and consequently the maximum length of feed of the stock. It will be noted that the lever 3| must move at all times sufilciently far before the pin 38 carried thereby engages the stop 4| to effect a movement of the cone 28, such that the collet will release its grip on the stock.

As is customary, means is provided for supporting and housing the stock extending from the rear end of the feed tube, said means including a pair of stock stands 42 interconnected by the rod 28 to form a unitary structure. The rear stock stand 42, that is the left-hand stand as viewed in Figs. l and 2, is provided at its upper end with a swivelly mounted sleeve 43 through which extends and is rigidly connected thereto the stock housing tube 44. The other stock stand 42 is provided at its upper end with a supporting portion 45 for the tube 44, which p'o'rtion has a laterally extending arm 46 for supporting the housing tube 44 when the latter is swung outwardly to loading position, as indicated in dotted lines in Fig. 2. The supporting portion 45 is also provided with a clamping latch 41 for holding the tube 44 in axial alignment with the feed tube 21. The forward or righthand-end, as viewed in the drawings, of the housing tube 44 is provided with suitable means for clamping the stock during the loading operation of Fig. 2, the bar of stock inserted therein and said tube then moved into alignment with the feed tube and locked in such position. The

.the bar of stock and then thereof and, since said lever is feed tube 21 is then mov tion, as shown in Fig. 5, stock is pushed inwardly its inner end abuts with the spring fingers on the end of the feed tube; then the jaws of the vise 48 are brought into holding engagement with the bar of stock, after moved rearwardly into the position shown in Fig. 3, which movement causes the spring fingers on the end of the feed tube to open and ride upon be in gripping position thereon. After the stock has been gripped by the fingers of the feed tube the vise 48 is released and does not function again until a new bar is inserted.

The operation of the stock feeding and gripping device, comprising the embodimentheretofore described, is as follows:

Assuming that a stock bar has been inserted, as heretoforeexplained, and that a work piece has been completed and severed from the bar and also that the stop 4| has been. properly adjusted to enable the device to feed the desired (1 to its innermost posiafter which the bar of of the feed tube until length of stock, the lever 3i is moved from the full line position of Fig. 3, to the dotted line position thereof. This movement of the lever 3| first moves the wedge cone 28 to allow the collet 24 to release its grip on the stock and then efl'ects an engagement of the enlarged portion 38 of the pin 38 with the stop 4| to cause a movement of the rod 48 and slide 33 until the slide 38 abuts the boss 28a, resulting in a feeding movement of the feed tube 11 and the stock and in the movement of the lever 38 to the dotted line position of Fig. 3. moved in the reverse direction, that is, from the dotted line position of Fig. 3 to the full line position thereof, whereupon the wedge cone 28 moves from the position shown in Fig. to that shown in Fig. 4 and the collet 24 is again caused to grip the stock, it being remembered that this last mentioned movement of the lever 3| does not efl'ect any movement of the slide 33 and feed tube 21. After the collet 24 has again gripped the stock, the lever 38 is moved from the dotted.

line position of Fig. 3 to the full line position connected by the rod 32 with the slide 33 the latter and the feed tube 21 are moved from the position shown in Fig. 5 to that shown in Fig. 4, the feed tube flngers during such movement riding over the stock which is now gripped by the collet.

'The embodiment of the invention illustrated in Figs. 6- to 9, inclusive, is of such character that the feed tube, as shown in the flrst embodiment,

is omitted. The present embodiment is suitable for use upon machines operating on the larger diameter stock, that is, stock which is sufliciently large andrlgid to prevent exposed and unsupported lengths thereof from whipping during rotation.

In the present embodiment those parts which operate the collet I4, namely, collet actuating sleeve 23, wedgecone, and pivoted fingers 25 moved to the dotted line posiwhich the feed tube is The lever 3| is thenare substantially the same as in the previously 7 described form. The wedge cone 28 is actuated by a lever 48 pivotally mounted on the head 2! of the machine and connected by alink 58 to a lever 5| pivoted intermediate its ends on a bracket 52 secured to the end of the head, said lever 5i at its upper end being provided with a fork s'trad: dling the cone 28 and having rollers engaging in the annular groove in said cone. It'will be noted that movement of the lever 49 from the position shown in Fig. 8 to that shown in Fig. 9 effects a movement of the cone 28 such that the collet 24 releases its grip on the stock. As in the previously described form a rod 53 is secured to the bracket 52 and extends through one of the stock stands 54 and is secured to stands 54, thus interconnecting the same.

The rod 53 between the bracket 52 and the stock stand 54, through which the rod is provided on its upper side with an elongated slot 55 slidably arranged in which is a ratchet bar 58. The ratchet bar 58 on a portion thereof adjacent the head of the machine is not provided with ratchet teeth, said portion being recessed for a part of its length forming stop shoulders 58a and 58b, see Figs. 8 and 9. A slide 51 is arranged on the rod 53 and embraces that portion of the the other of the stock extends,

ratchet barv between the stop shoulders 58a and I 58b. The slide 51 is provided with an upwardly extending shoe engaging in the groove of the wedge cone 28, wherefore it will be seen that when saidwedge cone moves movement will be irn- 58 has a downwardly extending forked portion 58 which straddles a rod 88 secured to the bracket 52 'on the head of the machine and to the inner of the stock stands 54, thus providing means for maintaining the slide 58 in an upright position. The slide 58 is provided with an upwardly extending portion 8| forming a head in which is rotatably secured a vise 82 in the present instance provided with a plurality of radially extending clamping screws 83 for gripping the stock, as will later be explained. The slide 58 above the rod 53 is provided with a pawl 84 cooperating with the ratchet teeth of the ratchet bar 58 and counterweighted by a handle 84a. The slide 58 is provided with a second upwardly extending portion 85 having a bore into which extends the end of a stock housing tube 85'. The stock housing tube 88' adjacent the end thereof that extends into the bore of the slide 58 is provided with an annular flange 81 abutting against the portion 85. The portion 85 of the slide 58 is provided with an arm 88 of such length as to extend over and beyond the flange 81 of the housing tube 88, it being noted that the arm 88 on its inner side is provided with a groove, see Figs. '7 and 9. The

portion 85 of the slide 58is further provided with a rearwardly extending boss upon which is pivotally mounted a latch lever 89 which when the end of the tube 88 is arranged in the bore of the portion 85 may be'sw'ung into the groove on the underside of the arm 88 .and thus will engage the flange 81 on the opposite side thereof from.

the portion 85 to hold the endof the tube in the bore of the portion 85 and thus connects the housing tube 88to the slide 58.

The housing tube 88 is slidably supp rted adjacent its rear end by a sleeve 18 swivelly mounted on the upper end of the rear stock stand 54, so

t the housing tube 88 may be swung to the latch lever 66 is swung into 68 and behind the flange release the grip of drawings, and since the stock will have been stock projects beyond the collet 24. Then the tube is moved endwise until its end has entered the bore of the portion 65 and'the flange 61 is in engagement with said portion, whereupon the the groove in the, arm 61, whereby the slide 66 and the tube 66 are interconnected. The clamping screws 63 of the vise 62 are then brought into clamping engagement with the stock, so that as the slide 56 moves the stock will move. Assuming the stock to have been inserted into the machine, as just referred to, and the parts to be in the position shown in Fig. 8, and that the work upon the length of stock projecting from the collet has been completed and the work blank severed therefrom, movementof the lever 49 to the right, as viewed in the drawings and from the position shown in Fig. 8 to that shown in Fig. 9,. eifects the following result:

' The initial portion of the movement of the lever 46 serves to withdraw the wedge cone 26 from between the ends of the pivoted fingers 25 and to During this initial portion of the movement of the lever 46 and the movement of the wedge cone 26, the slide 51,- operatively connected with said cone, moves so that ,its rear end disengages the stop shoulder 56a. of the ratchet bar 56, while its forward end comes into engagement'with the stop shoulder 56b of said bar. The remainder of the movement of the lever 49, while continuing to move the wedge cone 26, also effects, through the slide 51 which is now in engagement with the stop shoulder 56b, a movement of the ratchet bar 56 until the forward end of the ratchet bar abuts the boss on the bracket 52 which carries the rod 53, whereupon further movement of the lever 49 and of the slide 51 is'arrested. After the lever 49 has been moved sufficiently to effect a release of the collet, as just explained, and to bring the slide 51 into engagement with the stop shoulder 56b, the further movement of the lever 49 moves the ratchet bar 56 toward the right, as viewed in the the counter-weighted pawl 66 carried by the slide'56 is in engagement with the ratchetteeth of the bar 56, the slide 58 will move a corresponding distance to the right, that is, from the position shown in Fig. 8 to that shown in Fig. 9. This movement-of the slide 56 causes a corresponding movement to be imparted to the stock which is gripped by the vise 62 carried by the slide. and also a corresponding movement to the stock housing tube 66 which is interconnected to the portion 65 of the slide 56. At the completion of the movement of the lever 49 to the right fed forwardly through the collet the desired-distance, whereupon the lever 66 is swung in the opposite direction to move the wedge cone 26 between the pivoted fingers 25 and to effect a gripping action of the collet upon the stock.

During this last named movement of the cone 26 the forward end of the slide 51 moves out of engagement with the stop shoulder 56b of the ratchet bar 56. While the rear end of the slide 51 engages the stop shoulder 56a. whereupon the ratchet bar 56 is moved rearwardly or to the left,

the collet 24 upon the stock.

as viewed in the drawings, the slide 56 remains stationary, since the pawl 64 rides over the teeth of the ratchet bar. Since the slide 56 moves forwardly during the feeding operation, but remains stationary while the ratchet bar is restored to its initial position, it will be seen that after a number of feeding operations the slide 58 will have been moved to its maximum forward position, such as shown ,in Fig. 6; that is, to a position closely adjacent to the spindle end. It will then be necessary to loosen the clamp screws 63 of the vise 62 andmove the slide 58 and the stock housing tube 66 back to the position shown in Fig. 8, whereupon the screws 63 are again tightened and the operation of the machine continued. It will be understood that the maximum length to which the stock may be fed is determined by the engagement of the end of the ratchet bar 56 with the boss on the bracket 52, as previously explained. In the present embodiment of the invention it is proposed to employ a the turret or other part of the machine when it is desired to impart a feed to the stock less than the maximum feed.

A third embodiment of the invention is illustrated in Figs. 10 to 15, inclusive, and which is of such character that the stock feeding and gripping device may be adapted to function with a feed tube as in the first embodiment, or without a feed tube and with a movable stock gripping head, as in the second or last described embodiment.

In the embodiment shown in Figs. 10 to 15, inclusive, the spindle 22, collet actuating sleeve 23, collet '24, wedge cone 26 and pivoted fingers 25 are the same as the corresponding parts in the previously described embodiments and, therefore, are similarly numbered in this last embodiment.

A lever II is fixed to the outer end of a rod 12 (see Fig. 11) extending intoand rotatably carinwardly of the head, has secured thereto an arm 13 to which is pivotally connected alink 14 that projects through an opening in the end of the head and is pivotally connected to the end of a lever 15 in turn pivotally mounted intermediate its ends upon a bracket 16 secured to the end of the head. The upper end of the lever 15 is provided with a forked portion having rollers engaging in the groove in the wedge cone 26, wherefore it will-be seen that movement of the lever II will effect a sliding movement of the wedge cone 26 upon the spindle 22.

A slide 1] similar to the slide 51 is mounted on a rod "secured to the bracket 16 and extending through one of. the stock stands-I6 and secured to the other of said stands, which rod is similar to the rod 53 in the last described embodiment. The slide 11 carries an upwardly extending shoe engaging in the groove in the cone wedge 26, wherefore movement of the cone wedge, effected through movement of the lever II, also acts to move the slide 11. The rod 18 is provided with an elongated longitudinally extending slot in which is slidably mounted a ratchet bar 60 provided with a portion having ratchet teeth and another portion without ratchet teeth. This latter portion of the ratchet bar is in turn provided with a recess somewhat longer than the length of the slide IT and forming shoulders 60a and 60b at-its opposite ends (see Figs. 12 and 13). It will be seen that movement of the slide 11 will cause its opposite ends to engage the shoulders 80a and 86b, respectively. whereupon theratchet bar 86 will move with said slide.

As in the second embodiment, the rod 86 also una link 93, the opposite slidably supports a second slide 8| from the derside of which extends a forked portion 82 straddling a rod 83 secured to the stock stand 19 and to the bracket 16, whereby the slide 8| is maintained in upright position. The slide 81 is provided 48 of the first The slide 8|, as in the second embodiment, is

tending portion spaced from the head 84 and having at its upper end an extended portion forming a support 81 for the end of .the stock housing tube eters of stock as will now be explained.

A sleeve 9| is rotatably mounted upon the rod 12 and has an extension which carries an operating handle 9?, as clearly shown in Fig. 11. The inner end of-the sleeve 9| is provided with an arm to which is pivotally connected one end of tive position, that is, in

- of course, be

' feed tube or the jaws of end of which is pivotally connected to a lever pivotally mounted intermediate its ends upon a bracket 95 secured to the rod 83. The upper end of the lever 94 has a forked portion carrying rollers which engage between flanges on the end of the feed tube 98, wherefore it will be seen that oscillating movement of the operating handle 92 eflects a. reciprocating movement of the feed tube 96.

In order to provide means which will define the maximum limits of movement that may be imparted to the feed tube 96 and thus to the stock, a stop collar 91 is fixed to the rod 18 and a stop collar 98 is adjustably mounted on said rod 18, the lever 94 being provided with abutting portions 94a and 94b which engage the collars 98 and 91, respectively. It will be understood that the coliars 91 and 98 are provided ried by the connection between the link 14 and the lever 15 and extends through an opening in the enlarged head of a shouldered pin I80 forming the pivotal connection between the link 93 and the lever.

An adjustable stop IBI is mounted on the rod 99 between the levers 15 and 94 and is for a purpose similar to the purpose of the stop II in the first embodiment. ment is employed without a feed tube, as illustrated in Figs. 14 and 15, the stop I0! is moved to an inoperative position, such as shown in Figs. 14 and 15, wherefore movement of the lever 1| efiects no movement of the operating handle 92 and lever 94.

However, when the present embodiment is used with a feed tube, as illustrated in Figs. 10 to 13, inclusive, the stop I01 is set in an operasuch position thatit will engage with the enlarged portion I00 of the shoulder pin carried by the lever 94 after the lever 1| has been swung to the right, as viewed in the drawings, sufi'iciently far to move the wedge cone 28 to collet releasing position. When the device is employed with a feed tube it will,

necessary to render the pawl carried by the slide 8! inoperative. This is accomplished by swinging the pawl handle 86 from the position shown in Figs. 14 and 15 to the position shown in Fig. 10 and locking the same in the latter position by means of a screw I 02 which engages beneath a cutaway portion formed on the pawl handle.

When small diameter stock is being used with the feed tube, the slide 81 with the housing tube 88 secured thereto may be moved to and remain in a position adjacent the end oi. the feed tube, wherefore there will be no substantial length of stock not supported by and housed in either the housing tube 88, thereby eliminating likelihood of the stock whipping during the rotation of the stock when the machine is operating.

It will, of course, be understood that when the device is used with a feed tube the jaws of the vise 85 are moved out of gripping engagement with the stock, but are used during the loading of new bars of stock in the same way as are the the vise 48 in the first embodiment.

When it is desired to switch to the use of a feed tube, assuming the machine to have been operating without such tube, the bearing pin I08 for the lever 94 is withdrawn and said lever allowed to drop downwardly, whereupon the feed tube 96 may be inserted into the spindle, follow- When the present embodiformer position, it being understood that the of the lever. It will be ing which the lever 94 is again moved upwardly and the rollers at the forked upper end positioned between the flanges onthe end of the feedtube and the pin I03 is reinserted. Of course, to remove the feed tube the reverse operations are necessary.

The operation of the device just described and with the feed tube will now be explained with reference to Figs. 12 and 13'. Assuming that a bar of stock is in the spindle and that a work piece has just been completed and severed therefrom and that the stop'oollar 98 and the stop I01 have been properly adjusted for the length of feed desired, the lever II and its associated parts are moved from the-position shown in Fig. 12 to the position shown in Fig. 13. The initial portion of this movement of the lever H moves the wedge cone 26 to effect a release of the gripping action of the collet upon the stock. At the end of this initial portion of the movement of the lever 1|, the stop Hil comes into engagement with the enlarged portion lllflof the headed pin carried by the lever 94 and, therefore, the further movement of the lever H in the same direction effects an additional movement of the cone 26 toward the right, as viewed in the drawings, and also a swinging movement of the lever 94 which in turn moves the feed tube inwardly of the spindle in a. stock feeding direction to position a predetermined length thereof beyond the collet, until the abutting portion MD on the lever 94 engages the stop collar 91 thus preventing further movement understood that as the cone wedge 26 moves the slide 11' and the ratchet bar 80 also move, it being remembered that the pawl on the slide 8| is locked in an inoperative position and hence no movement is imparted to this latter slide. In order to again have the collet grip the work, the lever 1| must be moved from the position shown in Fig. 13 to the position shown in Fig. 12. This movement of the lever moves the wedge cone 26 between the pivoted fingers 25 and causes the collet to grip the stock. However, it will be noted that said movement of the lever 1| in the last'named direction does not impart any movement to the lever 94, since the stop llli merely moves with the rod 98 away from the enlarged portion Hill of the headed pin carried by the lever 94. After the collet has been restored to gripping position, the operating handie 62 is moved from the position shown in Fig. 13 to the position shown in Fig. 12, with the result that the lever 94 is swung about its pivot until the abutting portion 94a engages the stop collar 96 and the feed tube moved rearwardly to its spring fingers at the end of the tube slide over the surface of the stock. This last named movement of the lever 94 returns the enlarged portion In of the headed pin toa position shown in Fig. 12, wherein the stop I0! is separated therefrom a proper distance to permit the cone wedge 26 to first be moved to collet releasing position upon movement of the lever H before the stop engages with the portion I66.

Having thus described our invention, we claim:

1. In a stock feeding and gripping device fora machine tool, stock gripping means, stock feeding' means, and manually movable means for effecting release of the gripping means, actuation of the feeding means and closing of the gripping means, and a second manually movable means for restoring said feeding means to its initial position and independently-of the movement of said first named manually movable means.

machine tool, a stock ate the latter 2. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a slidable stock feeding tube, and manually movable means operable in one direction for releasing the collet and positively moving the feed tube to feed the stock.

3. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a slidable stock feeding tube, and manually movablameans operable in one direction for releasing the collet and positively moving the feed tube to feed the stock and operable in the opposite direction to close the collet.

4. In' a stock feeding and gripping device for a machine tool, a stock gripping collet, a slidable stock feeding tube, manually movable means for effecting release of the collet, movement of the tube to feed the stock and then closing of the collet, and a second manually movable means for imparting movement to said tube to restore the same to its initial position independently of the movement of said first named manually movable means.

5. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a stock feeding tube, means for actuating said collet, means for actuating said stock feeding tube, and manually movable means having a positive operative connection with said collet actuating means and a lost motion operative connection with the actuating means for said stock feeding tube whereby movement of said manually movable means in ,one direction eifects a release of the collet and then a positive feeding of the stock.

6. In a stock feeding and grippin device for a machine tool, a stock gripping collet, a stock feeding tube, means for actuating said collet, means for actuating said stock feeding tube, a manually movable means having a positive operative conneetion with said collet actuating means, and adjustable means affording a lost motion operative connection between said manually movable means and the means for actuating the stock feeding tube when said manually movable means is moved in one direction to positively move the tube.

7. In a stock feeding and gripping device for a gripping collet, stock feeding means, manually operable means having a positive operative connection with said collet for actuating the same, and adjustable means for connecting said manually operable means with said stock feeding means first with a lost motion connection and then with a positive operative connection to positively feed the stock.

8. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a slidable stock feeding tube, manually movable means, and means for positively operativelyconnecting said manually movable means with said collet to actuand for operatively connecting said manually movable means with said feed tube with a lost motion connection to actuate the latter in a stock feeding direction, and a second manually movable means having a positive operating connection with said feed tube for restoring the same to its initial position after a stock feeding operation.

9. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a slide operatively associated with I means connecting said second slide with 'said said collet for actuating v the same, manually movable means positivelymanually movable means with a lost motion connection whereby movement of said manually movable means in one direction effects a feeding movement of said tube.

10. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a slide operatively associated with said collet, manually movable means for moving said slide in opposite directions to open and close said collet, a feed tube for feeding the stock, a second slide operatively associated with said feed tube, a rod connected with said second slide and having a slidable. connection with said manually movable means, and an adjustable stop carried by said rod and adapted .to be engaged by a portion of said manually movable means during its movement in one direction to effect a movement of said second slide and a feeding movement of the tube.

11. In a stock feeding and gripping device for a machine tool, a stock gripping collet, a slide operatively associated with said collet, manually movable means for moving said slide in opposite directions to effect an opening and closing of said collet, a feed tube for feeding the stock, a second slide operatively associated-with said tube, means providing a lost motion connection between said second slide and said manually movable means when the latter moves in one direction, a second manually movable means, and means positively connecting said second manually movable means with said second named slide.

12. In a stock feeding and gripping device for a machine tool, a stock gripping collet, means for opening and closing said collet, manually mov able means having a positive operative connection withsaid last named means whereby its movement in opposite directions actuates said collet, a movable stock feeding head including a stock gripping vise,-and means for operatively connecting said head with said manually movable means during the movement of the latter in onedirection and including a slide operatively connected with said "c llet; actuating means, a movable ratchet her having a lost motion connection with I said slide, and a rockable pawl carried by said head and operatively engaging the teeth of said ratchet bar when the bar moves in one direction.

13. In a stock. feeding and gripping device for a machine tool, in combination, a stock gripping collet, means-for opening and closing said collet, manually movable means for actuating said first means, a slidable stock housing tube, a movable stock feeding head including a stock gripping vise, and means for locking said head to said housing tube, means for operatively connecting said housing tube and said head to said manually movable means when the latter moves in a direction to effect release of the collet, said last, means including a slide operatively connected with said collet actuating means, and a movable ratchet bar having a lost motion connection with said slide,

and a rockable, pawl carried by said head and operatively engaging theteeth of said ratchet bar when the latter moves in one direction.

14. In a stock feeding and gripping device for a machine tool, a stock gripping collet, means for actuating said collet including a movable wedge cone and a pivoted-lever operatively associated with said cone, manually movable means having an operative connection with said lever, a stock feeding tube, a pivoted lever operatively associated with said tube, a second manually movable means operatively connected with said second named lever, a rod connected with said first named lever and having a sliding connection with said second named lever, and an adjustable stop carried'by said rod and adapted to be brought 15. In a stock feeding and gripping device for.

a machine tool, a slidable stock housing tube, a movable stock 'feeding head including a stock gripping means, means for locking said head to said tube, and means for moving said head.

16. In a stock feeding'and gripping device for a machine tool, a movable stock feeding head including a stock gripping means, apivoted stock housing tube, means for locking said head to said tube when the latter is aligned therewith, and means for moving said head.

17. In a stock feeding and gripping device for a machine tool, a movable stock feeding heat including a stock gripping means, a slidable and pivotally mounted stock housing tube, means for locking said head to said tube when the latter is aligned therewith, and means for moving said head.

18. In a stock feeding. and gripping device for a machine tool, a movable stock feeding head including a stock gripping means,'a pivoted stock housing tube adapted to be aligned with said head or to be swung out of alignmenttherewith, a

stationary support for said tube when the. latter tube when the'latter is in alignment therewith,

and means for moving said head.

20. In a stock feeding and gripping device for a machine tool; stock gripping means, stock feeding means, a pivoted stock housing tube provided at its end adjacent the said gripping means and said feeding means with means for clamping the.

stock whereby when said tube is aligned with said gripping means and said feeding means the stock may be held stationary by said clamping means until the stock feeding means has been properly positioned for the feeding of the stock after which the clamping means is released and the stock is moved forward by the feeding means and into the gripping means.

mi: '12. man. wmnmu J. 3mm

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