US1892929A

US1892929A - Metal working machine

Info

Publication number: US1892929A
Application number: US141118A
Authority: US
Inventors: Robert S Brown
Original assignee: NEW BRITAIN GRIDLEY MACHINE CO
Current assignee: NEW BRITAIN GRIDLEY MACHINE CO; NEW BRITAIN-GRIDLEY MACHINE Co
Priority date: 1926-10-12
Filing date: 1926-10-12
Publication date: 1933-01-03
Anticipated expiration: 1950-01-03

Description

9 R. 5. BROWN METAL WORKING MACHINE 4 Sheets-Sheet 1 Original Filed Oct. 12. 1926 I INVENTOR 5. :2 WWW BY L 2W 0W] MM ATTORNEY') Jam. 3, 1933. R. s. BROWN METAL WORKING MACHINE Original Filed Oct. 12, 1926 4 Sheets-Sheet 2 i a i 3 pm egg ATTORNEYS Fan. 3 1933. 5, BROWN LQQZQZQ METAL WORKING MACHINE Original Filed Oct. 12, 1926 4 Sheets-Sheet 3 L f 49 IL If" INVENTOR 3 F L ATTORNEY$ Jam 3,, 1193. R. 5. BROWN METAL WORKING MACHINE Original Filed Oct. 12, 1926 4 Sheets-Sheet 4 lNVE/IiTOR w 5. @fiQ /www AORNEY5 Patented 1.... 3, 1933 PATENT OFFICE ROBERT S. BROWN, 0] NEW BRITAIN, CONNECTICUT, ASSIGNOB, BY ASSIGN- MENTS, TO THE NEW BBITAIN-GRIDLEY MACHINE GOMPANY PDF NEW- BRITAIN, CONNEGTIOUT, A CORPORATION OF CONNECTICUT I METAL sca s mourns Application med October 12, 1926, serial in. 141,118. Renewed Iarch 2, 1932.

I My invention relates to a metal working machine, and is particularly, though not exclusively, adapted for incorporation in a multiple spindle bar machine, wherein operations are performed simultaneously on work carried by each of a plurality of spindles.

In both .single and multiple spindle machines of the character indicated, itis at the present time usual to feed a certain length of stock forward,then chuck the stock, then perform the desired operations upon the stock, after which the, stock is unchucked and another length fed forward. Thefeeding of the stock and chucking and unchucking are usually performed by cam means. vThe cams are arranged in a certain definite relation to the means, usually a cam, for actuating the tools so that the tool operatidns may be performed while the stock is chucked.

Heretofore, when it was desired to feed a longer length of stock, it has been usual to change the normal stock feed cam arrangement so as to provide a cam of greater throw for feeding the desired length of stock. So changing the cams was a time consuming and often difiicult operation. 1

It is the principal object of the present invention to provide simple means for increasing the range of length of stock which may be acted upon by increasing the length of stock fed for each cycle of the machine.

It is a more specific object to provide simple,

sturdy means for varying the speed of chucking and feed cams in relation to the main cam shaft of a machine of the character indicated, whereby longer or shorter lengths of stock may be fed without changing the normal camming of the machine.

Another object is to provide a stock feeding'means continuously connected to the main cam shaft and driven thereby at a variable rate of speed relatively to the shaft to accelerate the feeding movement of the stock feeding means.

Finally, the object is to provide an improved stock feeding mechanism which will act to rapidly yet smoothly feed the stock.

Briefly stated, in the preferred form of the invention, I employ a main cam shaft for actuating a tool slide andalso for actuatin the stock feed and chucking cams in de 'te timed relation to the rotation of the main 7 cam shaft. The chucking and feed cams are preferably mounted upon a shaft separate from the main cam shaft but actuated by the A the main cam shaftto the auxiliary cam shaft through the medium of gearing which serves to accelerate the action'of the feed and chucking cams so that Work stock will be fed and chucked and unchucked twice durin each cycle of the machine. This double feeding, double chucking and -doubleunchucking 1s preferably done in substantially the same space of time during a cycle of the machine as is requiredfor a normal single chucking,

a cycle. r

In the drawings which show,f'o r illustrative purposes only, a preferred form of the invention as applied to a metal working machine specifically of the multiple spindle bar machine type Figure 1 is a longitudinal view in partial section of a multiple sp' dle bar machine and illustrating features of the invention;

Fig. 2 is an enlarged, sectional view through parts shown at the left half of Fig; 1

Fig. 3 is an enlarged, fragmentary view in partial section of change speed mechanism illustrating the invention;

Fig. 4 is a view in end elevation of parts shown in Fig. 3; 7

Figs. 5 and 6 are diagrammatic develop ments illustratin the angular relation and sequence of certain operations;

Fig. 7 is a diagrammatic view illustrating the angular relation and sequence of certain operations.

In said drawings, 1 indicates the mainframe or base of a multiple spindle bar machine carrying a spindle'cylinder 2, in this instance of the stationary type. A plurality of rotatable spindles 3--3 are mounted in the single feeding and single unchucking during Ii The drive shaft 6 carries a gear 7, meshing with a gear 8 on the main drive shaft 9. Upon rotation of the main drive shaft 9 through suitable means, such as a pulley 10,

10 the shaft 6 will be rotated, and throu h the

gears

5 and 4, the-spindles, which are adapted to carry the bar stock such as 11, are rotated.

The stock 11'is fed forwardly, that is, toward the right as viewed in Fig. 1, by suitable means to be hereinafter described, and up to a work stop 12 carrying anti-friction devices 13-13 for arresting the feed. This work stop 12 may be moved up to and held in the desired position, and the stock fed up against the work stop and then chucked in the spindles. The work stop may then be withdrawn out of the wa beforethe tools act upon the projecting en s of the stock.

In the orm shown, the work stop is moved by cam means, such as 14, on a cam drum 15. The shaft 6 serves to drive the cam drum 15 through a gear mechanism, as shown in Fi 1. A pinion l6 meshes with the spur gear 1 which is on a suitable quill, which also carries the gear 18. The latter gear drives the gear 19 on a quill carrying a second gear 20, which in turn meshes with a gear 21 on the clutch shaft 22. The clutch shaft 22 carries a pinion 23, meshing with an internal gear 24 within the cam drum 15. Therefore, upon rotation of the main drive shaft 9, the cam drum 15 will be rotated. During the rotation of the cam drum 15, the slide 25 carrying the work stop 12 is moved up to and held in the desired position by the cam 14 and the work stock is then fed against the stop. After the work stock has been chucked, continued rotation of the cam drum 15, through cam means, serves to retract the stop 12 and leave the stock in properly chucked position.

The cam drum 15 in the present instance serves to drive the main cam shaft 26 direct ly. This main cam shaft may actuate a tool slide 27 through the medium of an arm 28 engaged by a cam 29 carried upon the main cam shaft. The position of the cam 29 is such that the tool slide carrying the desired tool or tools, is moved into operative position durin the time that the stock is held in chucked po-" sition. The main cam shaft 26 serves to actuate a feed cam 30 and a chucking cam 31 carried respectively upon drums 30'31.

Each spindle (Fig. 2) may carry a chuck 32 of such construction that when the chuck is drawn rearwardly through the medium of the chuck tube 33, stock in the chuck will be securely held. The bar stock 11 is fed forwardly by spring fingers 34 carried by the feed tube 35. The feed tube 35 is reciprocated by a spider36 cooperating with the spool 37 oh the feed tube. The spider 36 is carried upon a slide 38, which in turn is actuated in one direction by the feed cam 30 and in the reverse direction by a suitable cam or cams, not shown.

The stock is chucked, as stated, by drawing the chuck 32 toward the left as viewed in Fig. 2. This is accomplished in the instance shown by fingers 3939 carried upon the end of a chuck tube 33 -and acting against a part of the spindle 3. The chuck fingers 3939 are spread by means of a cone 40, which is in turn actuated by a spider 41 carried upon the draw rod 42, which is in turn reciprocated by means of a lever 43v coacting with cams-such as 31 on the chucking drum.

Machines as thus far described, in which the drums carrying the cams 30-31 are fixedly mounted upon a main cam shaft such as 26, are now well known in the art. The illustrative embodiment of my present invention has to do particularly with the connection and operative relation between the main cam shaft 26 and the drums-3031' carrying the feed and chucking cams 30-31.

In the form shown, an auxiliaryeam shaft 45 is mounted in a suitable bearing and is preferably in alinement with, but at times rotatable relatively to the main cam shaft 26. As shown particularly in Fig. 2, the cam drums 30--31 are fixedly-secured upon the auxiliary cam shaft 45. During what maybe termed the normal operation of the machine when a single length of stock is to be fed forward for each cycle of the machine, I prefer to connect the main cam shaft 26 and the auxiliary cam shaft 45 to each other so that they rotate together. The machine then operates as machines of the prior art, in that the chucking and feed cams are in effect mounted directly upon the main cam shaft. In the form shown, I may connect the

cam shafts

26 and 45 for directdrive as follows:

The auxiliary cam shaft is provided with a long spline key 46, which fits a corresponding keyway in a sleeve 47 so that the sleeve 47 is constantly rotatable with the auxiliary cam shaft 45. The sleeve 47'carries a pinion 48, for a purpose to be described. The main cam shaft 26 may have a key 49 thereon, so that when the sleeve 47 is slid along the auxiliary cam shaft 45, the keyway in the sleeve 47 Will fit over the key 49, and both

shafts

26 and 45 will rotate as a unit. The positions of the sleeve 47 and pinion 48, when the

shafts

26 and 45 are rotatable together, are shown in dotted lines in Fig. 3. The sleeve would ordinarily be secured in such position by inserting a pin, such as 50, through the hole 51 in the end of the sleeve 47, and through a rectly connected to ether. The sleeve 47 is preferably held in t e full line position also y means of the pin 50 extending through registering apertures in the sleeve and auxiliary cam shaft 45. Now, when the

shafts

36 and 45 are held so as to be rotatable as a unit (dotted line position in Fig. 3), theaction of the machine will be as follows Rotation of the main drive 9 will cause the spindles to be rotated as heretofore described. The cam drum 15 will be rotatedso as to cause the cam 14 to position the work stop 13 in the desired position to stop the ends of the bar stock 11 in the various spindles. The cam drum 31 will be rotated so as to cause the cam 31 to release the clutch 32. The feed cam 30 on the feed cam drum 30' will then cause the slide 38 to move toward the right as viewed in Fig. 2, and through the spring fingers 34, will cause the stock 11 to be fed forwardly an appropriate distance. If the throw of the cam 30 is sufficient, the stock 11 will abut the work stop 12 and further movement of the spring fingers 34 will simply cause the latter to frictionally slide along the stock. Continued rotation of the main cam shaft will cause the chucking cam, such as 31, to move the draw rod 42 toward the left into the position shown in Fig. 2. and cause the cone 40 to separate the chuck fingers 39 and cause the stock 11 to be chucked. After the work is chucked, the cam 29 serves to actuate the lever 28, which in turn actuates the tool slide to ad- .vance the tools to the work and perform the desired operations thereon. Preferably the work stop 13 is withdrawn prior to the end of the forming or cutting off operation performed on the work stock. Thereafter a cam, such as 31, on the chucking cam drum 31' moves the draw rod 42 toward the right and unchucks the stock 11, and another length is fed forward, as described, the feed tube having been drawn back for a new length while the stock was chucked. One cycle of the machine, therefore, may be said to be feeding a length of stock forward, chucking the same and performing operations on the chucked stock, drawing back the feed fingers, and then unchucking the bar stock. The normal camming of the machine causes one length of stock to be fed forward and chucked and unchucked once during each cycle of the machine. Now, if a greater length of stock is desired, it would ordinarily be necessary to change the cam or cams on the feed cam drum 30' so as to feed the requisite length. In some cases, it might even be that a new cam drum would have to be put in place in order to have the requisite length of stock fed. By means of my present invention, I am enabled to feed more than one length of stock during a cycle of'themachine, and, as specifically shown. twice the length of stock that is permitted by the greatest feed of the feed cam under normal conditions. This desirable result is effected in the preferred form of the invention by rotating the auxili- 'ary cam shaft at a higher speed than the cam shaft 26 so that more than one feed, chucking and unchucking takes place during a cycle of the machine. It is therefore possible to cause work to be chucked and unchucked more than once'during each cycle of the machine, and more than one length of stock may be fed during the same cycle of the machine, and all of these operations may be caused to be performed during substantiall the same time that a single length of stock is fed forward under the normal operation of the machine.

As a preferred form of mechanism for causing the machine to feed more than one length of stock forward during a cycle of the machine, I may employ a system of gearing as follows:

The main cam shaft 26 has keyed thereon a gear having teeth at different distances from the center of rotation, such as the elliptical gear 55. This gear may mesh with a corresponding gear 56 carried by a countershaft 57 mounted upon the frame of the vmachine. The elliptical gear 56 may be secured to a quill 58 carrying a spur gear 59,

which in turn meshes with the pinion 48 on the sleeve 47 when the latter is in full line position as shown in Figs. 2 and 3. In the particular design illustrated, the gear 59 has twice as many teeth as the gear 48, and consequently one revolution of the gear 59 will cause the pinion 48 and the auxiliary cam shaft 45 to revolve twice. Now, upon one complete revolution of the main cam shaft 26, it will be clear that, through the two elliptical gears and the two spur gears, the auxiliary cam shaft 45 will be caused to make two revolutions but, due to the eccentrically mountedgears, the rate of angular travel of the auxiliary cam shaft 45 will be variable.

It will be clear that with gears 48- 59 of a different ratio, for example, a ratio of 1:1, the shaft 45 will make one revolution for every revolution of the shaft 26, butthe angular speeds of the two shafts will be variable, due to the variable speed mechanism, such as gears 55- -56. This variable rate of rotation with the gear ratio shown permits me to accomplish a double chucking, a double feed of stock. and a double chucking during one cycle of the machine or, as herein specifically shown, during one complete rotation of the main cam shaft 26, and these double functions may be accomplished in substantially the same period of time during a cycle as the single unchucking, single stock feed and single chucking of the stock during the so called normal operation of the machine.

A particular design ofmachine which has proven entirely satisfactory in practice is operations upon the chucked stock. During the time the stock is chucked and operations are being performed upon the chucked stock,

the feed fingers 34 are drawn back so as to grip a new length of stock for the next stock feed. Due to a variable speed device of the type illustrated particularly in Figs 3 and 4, I am able to effect the double unchucking,

double stock feed, and double chuckingduring substantially 156 of the rotation of the main cam shaft, thus leaving substantially 204 of the rotation of the main cam shaft for the performance of tool operations on the chucked stock;

These functions havebeen graphically illustrated in Figs. 5, 6 and 7 in relation to one revolutionof the main cam shaft 26. Upon referring to these figures and the previous reference to the machine which was designed to unchuck, feed and chuck once during a cycle of the machine, it will be plain that during the so called normal operation, a single unchucking, a single stock feed, and a single chucking may be performed within a certain definite portion of the angular rotation of the main cam shaft, in this case during substantially 156 of such rotation. The stock then remains chucked for substantially 204 and the feed fingers .are drawn back during this 204. By providing a variable speed device, such as is illustrated particularly in Figs. 3 and 4, the work stock may be unohucked during 21 of the rotation of the main cam shaft 26, stock may be fed during the next 26 and the fed stock may then be chuckedduring the next 10 and may remain chucked during the next 42, during which latter period the feed fingers are drawn back to get a new length of stock. The stock is unchucked during the next 10. During the next 26, a second length of stock is fed forwardly, and during the next 21 the last chucking operation during .a cycle is performed. Then, during the next 204 of the rotation of the main cam shaft, the double fed length of stock remains chucked, and during this 204 rotation, the feed fingers are drawn back for a new length of stock. This would complete one cycle of the machine.

Fig. 5' graphically illustrates the foregoing actions and relations of unchucking and chucking the work stock, and reading directlyfrom Fig. 5 onto Fig. 6, the stock feeds and drawbacks are indicated. Figs.

5 and 6 indicate what may be termed developwhile Fig. 7 indicates these same actions or relationships angularl It will be seen that by connecting the two shafts 4526 through variable s eed gearing the feeding movement of the eed means, such as the feed cam, may be greatly accelerated, so that a long, smooth cam may be feeding portion of its travel and will be retarded during the remainder of the cycle.

One specific design has, been herein disclosed. Other designs providing for- 'a' greater or less time for performing tool operations on the chucked stock may be made.

I do not wish to be confined 'to the use of elliptical gears since other variable types of connection are contemplated within the scope of the invention.

The invention has been herein specifically disclosed as embodied in a multiple spindle bar machine, but it will be plain that the number of spindles employed is not of the essence of the invention, and the invention is applicableto a machine having one or more spindles. v The spindles may or may not be rotatable. The invention has further been described in connection with a metal working machine, and has been so designated, but the principles of the invention are of broader application, and I do not wish to be confined to a metal working machine.

I do not wish to be confined to the particular mechanical expedients herein specifically described for I wish to include any and all means within the scope of the claims for feeding either one or more lengths of stock without change of normal camming, and more particularly so when these operations are performed during substantially the same time that a single unchucking, single stock feed, and single chucking have been performed heretofore. y Y

I have spoken herein of feeding a double length of stock, but-by that I do not mean to limit myself to an actual double length of stock since the work stop may permit only slightly more than a single length to be fed, but by feeding a double length I mean that the feed device acts twice, and if the stock pedunrestrained, a double length would be I claim:

1. In a machine of thecharacter described, a plurality of rotatable work carrying spindles, means for rotating the same, a main cam shaft, means actuated thereby for performing an operation on the Work stock carried by said rotatable spindles, cam means movable by said main cam shaft for chucking and unchucking work carried by said spindles and for feeding stock to said spindles, said cam means normally serving to chuck and unchuck and feed one length of stock for one cycle of the machine, and means for accelerating said chucking and feed cam means to cause the same to chuck and unchuck and feed a length of stdck twice for each cycle of the machine.

2. In a machine of the character described, a spindle cylinder, a plurality of spindles rotatably mounted in said cylinder, means for rotating said spindles simultaneously, chucking means for chucking work stock in said spindles, feeding means for feeding work stock, means for simultaneously feeding work stock to all of said spindles, means for simultaneously chucking work stock in all of said spindles, a; main camshaft, means actuated thereby for performing operations on work stock carried by said spindles, cam means actuated by said main cam shaft for actuating said means for chucking work stock and feeding work stock once during a cycle of the machine and within a predetermined period in such cycle, and means for accelerating the action of said cam means for causing work stock to be unchucked, stock to be fed and chucked more than once during substantially said predetermined period during a cycle of the machine.

3. In a machine of the character described, a main cam shaft, an auxiliary cam shaft extending end to end with said main cam shaft, a pinion slidably but non-rotatably mounted onsaid auxiliary cam shaft, means for nonrotatably connecting said pinion with said main cam shaft whereby both said shafts may be caused by said pinion to rotate together,.an eccentrically mounted gear carried by said main cam shaft, a countershaft, an eccentrically mounted gear carried by said countershaft and meshing with said first mentioned eccentrically mounted gear, and a spur gear carried by said countershaft and movable with said eccentrically mounted gear thereon, said spur gear being positioned to mesh with said pinion when the latter is rotatably free of said main cam shaft, for the purpose described.

4. In a machine of the character described, a main cam shaft, an auxiliary cam shaft, a pinion constantly splined to said auxiliary cam shaft, means for splining said pinion to said main cam shaft when said pinion is in one position, whereby said main and auxiliary cam shafts will move together, a countershaft, a gear carried thereby and meshing with said pinion when the latter is in one position, an eccentrically mounted gear carried by said countershaft and movable with said gear meshing with said pinion, and a second eccentrically mounted gear carried by said main cam shaft and meshing with said first mentioned eccentrically mounted gear, for the purpose described.

5. In a machine of the character described, a spindle for carrying work stock, a main cam shaft, an auxiliary cam shaft, means actuated by said main cam shaft'for normal- 1y unchucking and feeding one length of stock and chucking the same during a cycle of the machine, an eccentrically mounted gear carried by one of said shafts, a countershaft, an eccentrically mounted gear carried by said countershaft and meshing with said first mentioned ecccntrically mounted gear, a spur gear on said countershaft andmovable with said eccentrically mounted gear thereon, and a second spur gear movable with said auxiliary cam shaft and meshing with said first mentioned spur gear, for the purpose described. 6. In a machine of the character described, a spindle for carrying work stock, a main cam shaft, an auxiliary cam shaft, cam means carried by the latter for normally feeding one length of stock during a cycle of the machine, means for normally coupling said main and auxiliary cam shafts to each other Whereby they rotate at the same speed, and means for uncoupling said shafts from each other and for increasing the rate of speed of said auxiliary cam shaft relatively to said main cam shaft for causing said cam means on said auxiliary cam shaft to feed two lengths of'stock during a cycle of the machine.

7. In a machine of the character described, a spindle for carrying work stock, a main cam shaft, an auxiliary cam shaft, cam means actuated by said auxiliary cam shaft for normally feeding one length of stock within a predetermined period during a cycle of the machine, means for normally driving said main and auxiliary cam shafts at a predetermined relative rate of speed, and change speed mechanism for accelerating the speed of said auxiliary cam shaft relatively to said main cam shaft for causing said cam means carried by said auxiliary cam shaft to feed more than one length of stock during substantially said predetermined period in a cycle of the machine.

8. In a machine of the character described, a spindle for carrying work stock, a main cam shaft, an auxiliary cam shaft, cam means carried by said auxiliary cam shaft for normally unchucking work stock and feeding one length of stock, and chucking the same once during a. cycle of the machine, means normally driving said main cam shaft and auxiliary cam shaft at the same rate of speed, and change speed mechanism for accelerating the speed of said auxiliary cam shaft for causing said cam means on the latter to unchuck and chuck work stock twice during a cycle of the machine and for feeding two lengths of stock during such cycle.

9. In a machine of the character described,

a spindle for carrying work stock, means for normall feeding one length of stock within a pre etermined period during a cycle of the machine, and s eed varying mechanism including a pair 0 eccentrically mounted meshing gears for accelerating said means to cause said means to feed more than one length of stock during substantially said predetermined period during a cycle of the machine.

10. In a machine of the character described, a spindle for carrying Work stock, cam means for normally unchucking and feeding a length of stock and chucking the same within a predetermined period in a cycle of the machine, and speed varying mechanism including an eccentrically mounted gear for accelerating said cam means to cause the same to unchuck and feed two lengths of stock within substantially said predetermined period during one cycle of the machine.

11. In a machine of the character described, 21 spindle for carrying work stock, cam means for normally feeding one length of stock for each cycle of the machine, and speed varying mechanism including an eccentrically mounted gear for accelerating said cam means to cause the same to feed more than one length of stock during a cycle of the machine. W

'12. In a machine of the character described, a spindle carrying work stock, cam means for normally unchucking and feeding one length of stock and chucking the same within a predetermined time during a cycle ofthe machine, and means to accelerate the speed of said cam members for causing said cam means to unchuck and feed a length of stock and chuck the same twice durin a cycle of the machine and within substantially the same said predetermined time.

13. In a machine of the character described, a spindle for carrying work stock,

predetermined time, and means for accelerating said means for feeding more than one length of stock during a cycle of the machine and in substantially the same time as one length of stock was previously fed.

14. In a machine of the character described, a spindle for carrying work stock, cam means for normally feeding one, length of work stock during a cycle of the machine, and means for accelerating the speed of said cam means for feeding more than one length of stock during a cycle ofthe machine.

15. In a machine of the character described, a spindle for carrying work stock,

means for normally feeding one length of stock during a cycle of the machine, and means for accelerating the speed of said firstmentioned means for causing two lengths of stock to be fed for one cycle of the machine.

. 16. In a machine ofthe character described, a main cam shaft, an auxiliary cam shaft and speed varying mechanism for connecting said main cam shaft and auxiliary cam shaft for driving said cam shafts in unison and at variable speeds relatively to each other, and stock feeding means actuated by said auxiliary cam shaft whereby stock may be fed rapidly thereby durin the high speed of said auxiliary cam sha relatively to the speed of said main cam shaft.

17. In a metal working machine, a cam shaft, a cam actuated thereby, a tool actuated by said cam, a stock feed cam actuated by said cam shaft, and means for driving said first mentioned cam and said stock feed cam at a varying relative rate of speed whereby stock may be fed during the relatively high speed movement of said stock feed cam.

18. In a metal working machine, a main cam shaft, a stock feed cam coaxial with said main cam shaft, and means for driving said stock feed cam from said main cam shaft at a variable rateof speed relatively to the speed of said main cam shaft whereby stock may be fed during the relatively high speed movement of said stock feed cam.

19. In a metal working machine, a main cam shaft, a plurality of cams driven by said main camshaft, and means for causing one of said cams to be driven at a variable rate of speed relativel to the other cams, and stock feed means riven by one of said cams whereby stock may be fed during the relatively high speed movement of said cam.

20. In a stock feeding mechanism, a main cam shaft, a tool actuated thereby, stock feeding means driven by said main cam shaft and actuated continuously therewith, and speed varying mechanism connecting said main cam shaft and said stock feeding means for causing the latter to move at a variable rate of speed relatively to said main cam shaft during movement of said shafts.

21. In a stock feeding mechanism, a main cam shaft, a tool actuated thereby, stock feeding means actuated by said main cam shaft and movable continuously therewith, and speed varyin mechanism connecting said main cam shaft and said stock feeding means for accelerating the movement of stock feeding means during the stock feeding movement and while said main cam shaft revolves.

22. In a metal working machine, a cam shaft, a cam thereon, a tool actuated by said cam, a second cam shaft, a stock feeding cam carried and actuated thereby, and a speed varying device connecting said cam shafts for causing said shafts to rotate at variable relative rates during rotation of said shafts.

23. In a metal Working machine, a main cam shaft, a cam thereon, a tool actuated by said cam, a second cam shaft, a stock feeding means actuated by said second cam shaft, and variable speed mechanism connecting ments ofsaid shafts but at a variable relative rate of speed duringmovement of said shafts.

24. In a stock feeding mechanism, a cam shaft, a tool actuated thereby, stock feeding means, speed varying mechanism for connecting said cam shaft and said stock feeding means, said speed varying mechanism eontinuously connecting said cam and stock feeding means whereby said stock feeding means is accelerated during the stock feeding movement and retarded thereafter.

2-5. In a stock feeding mechanism, a stock feeding means, and variable speed driving means for continuously driving said stock feeding means at various rates, whereby stock may be fed during the accelerated movement of said stock feeding means.

26. In a metal working machine, a chuck, a tool, cam means for actuating said tool, cam means for actuating said chuck, a common driving means for said two cam means and speed varying mechanism for moving one of said cam means at a variable rate relatively to the other of said cam means while said cam means are moving whereby one of the mechanisms actuated by one of said cams may be actuated during a relatively high speed of its cam means, while the other of said cam means is acting at a relatively slower rate.

27. In a metal working machine, a chuck, a tool, a plurality of coaxially mounted ca ms for actuating said tool and said chuck, and means for moving said cams at variable speeds relatively to each other during move ment of said cams whereby one of said cams may perform its function while moving rapidly while the other of said cams is moving relatively slower.

28. In a metal working machine. a chuck carrier, a plurality of chucks carried thereby,

stock feed means, a tool carrier, means including cams for actuating tool carrier and said stock feed means, and means for actuating said cams' relatively to each other at variable rates of speed during movement of said cams.

29. In a metal working machine, a chuck, a tool, actuating means for said tool, actuating means for said chuck, means including separate cams for operating-said actuating means, and means including variable speed driving mechanism between said cams for moving the latter relatively to each other at variable rates of speed during movement of said cams.

30. In a metal working machine, a chuck earlier, a plurality of chucks carried thereby,

other at varyin rates of speed during move ment of both 0 said cams.

31. In a metal working machine, a chuck, a tool, means for actuating said chuck, means for actuating said tool, and means including Variable speed driving mechanism between said two last mentioned means for actuating said means relatively to each other at varying rates of speed during actuation of both said means.

32. In a metal working machine, a chuck,

a tool, a plurality of shafts for actuating said members aforesaid, and variable speed driving mechanism for driving said shafts at varying rates of speed relatively to each other durin rotation of said shafts.

33. In a metal working machine, stock feed means, actuating mechanism for said stock feed means including a driven shaft, a driving shaft, meshing gears mounted eccentrically on said shafts whereby one ofsaidshafts will be actuated at a varying rate of speed relatively to the other of said shafts during rotation of said shafts.

34. In a metal working machine, means for actuating parts of said machine including three shafts, meshing gears eccentrically mounted on two of said shafts, meshing gears mounted on one of said two shafts and on the third said shaft whereby at least two of said shafts will be rotated relatively to each other at varying rates of speed during rotation of said shafts, and actuating mechanisms operable by at least two of said shafts for actuating parts of said machine.

35. In a metal working machine, a tool, stock feed means, means for actuating said tool and stock feed means including two actuators, means for driving said actuators, said last mentioned means including eccentrically mounted meshing gears whereby said actuators will be operated at varying rates of speed relatively to each other during operation of said actuators.

36. In a metal working machine, a tool, stock feed means, a first cam shaft, a cam thereon for actuating said tool, a second cam shaft, a cam thereon for actuating said stock feed means, means for driving one of said cam shafts and variable s eed gearing connecting said two shafts where y said second shaft will be driven by said first shaft at a variable rate of speed relatively thereto during movement of said shafts.

37. In a metal working machine, a tool carrier, work carrying means, two coaxial cams for actuating said tool carrier and work carrying means, and means including vari able speed driving mechanism for moving said cams at variable rates of speed relatively to each other during movement of said cams.

38. In a metal working machine, a tool carrier, stock feed means, a pair of parallel relatively rotatable shafts, means operated by said shafts for actuating said tool carrier and said stock means,,and means including variable speed gearing for driving said shafts at variable rates of speed relatively to each other during rotation of said shafts. 39. In a metal working machine, a work carrying portion including a plurality of chucks and stock feed means, a tool carrying portion, means for actuating parts of said portions including two shafts, and means for driving one of said shafts by the other of said shafts including variable speed mechanism whereby said shafts Will be actuated relatively to each other at variable rates: of speed during actuation of said shafts, said stock feed means being actuated by the driven shaft aforesaid. I

40. In a metal working machine, a tool carrier, a rotatable shaft having means for advancing and retracting said tool carrier, work carrying means including a carrier and a plurality of chucks together with stock feed means, a second shaft having means for actuating said stock feed means, said second shaft being driven by the other of said shafts by means including a variable speed mechanism whereby one of said shafts will be rotated by the other of said shafts at variable rates of speed during rotation of said two shafts.

41. In a metal Working machine, work carrying means including stock feed means, tool carrying means, a rotatable part for actuating said tool carrying means, a rotatable part for actuating said stock feed means, and variable speed mechanism connecting said two rotatable parts whereby said parts will belrotated at variable rates of speed during rotation of said rotatable parts.

'42. In a machine of the character indicated, a tool, feed means therefor, stock feed mechanism, and means for actuating said stock feed mechanism to cause the same to act twice during a cycle of the tool feed means, the second drawback of the stock feed mechanism being coincident with the feeding movement of the tool feed means.

1 ROBERT S. BROWN.