US2061417A

US2061417A - Pick-up mechanism for multiple spindle screw machines

Info

Publication number: US2061417A
Application number: US42176A
Authority: US
Inventors: Alfred E Drissner; Beacom Robert
Original assignee: National Acme Co
Current assignee: Devlieg Bullard Inc
Priority date: 1935-09-26
Filing date: 1935-09-26
Publication date: 1936-11-17
Anticipated expiration: 1953-11-17
Also published as: FR809566A; GB464733A

Description

NOV- 1 1936- A. E. DRISSNER ET AL 2,061,417

PICK-UP MECHANISM FOR MULTIPLE SPINDLE SCREW MACHINES Filed Sept. 26, 1935 6 Sheets-Sheet l INVENTORS Eflrac'ssner BY Beacowv A EY Nov. 17, 1936.

A. E. DRISSNER ET AL.

PICK-UP MECHANISM FOR MULTIPLE SPINDLE SCREW MACHINES 6 Sheets-Sheet 2 Filed Sept. 26, 1955 m cm A w? IM A fl m B L M I l l l u. I l l l I I l l Nov. 17, 1936. A. E. .DRISSNER ET AL PICK-UP MECHANISM FOR MULTIPLE SPINDLE SCREW MACHINES Filed Sept. 26, 1955 6 Sheets-Sheet 4 .QM 0 O Om mm. T Q m 0 n.. mm W mm. E 1 LJ 0 0 0 #1 Q km E o ,J MN s m hv M RN m w ||-||J F. i 3 ml Ell uuuuunuct T m. .w m riiL m INVEJ TORS, ,E Dmtfisnero Nov. 17, 1936- A. E. DRlSSNER-ET AL PICK-UP MECHANISM FOR MULTIPLE SPINDLE SCREW MACHINES Filed Sept. 26, 1955 6 She ets-Sheet 5 INVENIORS, fllfiaeallif Dmcafiwe Patented Nov. 17, 1936 PICK-UP MECHANISM FOR MULTIPLE SPINDLE SCREW MACHINES Alfred E. Drlssner and Robert Beacom, Cleveland,

Ohio, assignors to The National Acme Company, Cleveland, Ohio, a corporation of Ohio Application September 26, 1935, Serial No. 42,176

25 Claims.

This invention has to do with metal workin machines such as automatic multiple and single spindle machines commonly known as automatic screw machines, the invention having particularly to do with what is designated herein as an automatic pick-up means, the object of the invention being to provide an improved means of this kind associated with the main tool slide of the machine and partly operated thereby during its advance movements.

A further object of the invention is the provision of an improved mechanism simple and efficient in operation and which may be used with an automatic multiple spindle machine having a main tool slide without in any way interfering with the operation of the machine and by means of which additional work may be performed and this-during the ordinarily idle time of the machine whereby the cost of production is materially decreased in that the necessity of finishing the piece on a separate machine is avoided.

A further object of the invention is the provision of an improved pick-up attachment or mechanism particularly adapted for use with an automatic machine having a rotary work spindle and an axially supported tool slide shiftable toward and from that spindle and in which the pick-up attachment comprises a rotary work holder carried by the tool slide and longitudinally shiftable thereon independently thereof and rotated by the driving means for the rotary work spindle at the same speed and in the same direction as said spindle and in which the rotary work holder is shifted toward the work spindle, then partly backward therefrom, then toward the spindle and then backward by suitable cam means from the main cam shaft of the machine and which rotary work holder includes means for clamping the end of the work or stock rod carried by the rotary work spindle prior to the cutting ofi thereof and operated by the tool slide on the advance thereof, a transversely operative severing or cut-off means carried by a cross or transverse slide of the machine for cutting off the end of the stock rod carried by the work spindle after it is clamped by the rotary work holder and means for operating on the end of the cut-01f piece after it is clamped by the work holder and after it is severed from the stock rod by the cut-oil tool and which last means is brought into operation on the retractive movement of the cross slide for operation on the cutoff piece during the last forward movement of the work holder and in the preferred form thereof is so connected with the CZ SS 31? t a t e latter on its retractive movement swings it into axial alignment with the rotary work holder for operating on the cut-off piece carried thereby. I

A further object of the invention is the provision of an improved pick-up attachment employing a finishing tool brought into operative position during the retraction of the cutting of! tool carried by a transverse cross slide of the machine.

A further object of the invention is the provision of an improved pick-up attachment in which a swinging finishing tool is connected with and is brought into operative position by a transverse or cross slide carrying a cut-ofi tool.

In the drawings accompanying and forming a part of this specification, Fig. 1 is a side view of this improved pick-up attachment and of the machine to which it is applied.

Fig. 2 is a cross-sectional view taken on the line 2-2 of Fig. 1, looking in the direction of the arrows.

Fig. 3 is a side view of the rotary pick-up work holder.-

Fig. 4 is a cross section taken on the line 4-4 of Fig. 3.

Fig. 5 is a top view partly in section of this improved pick-up attachment.

Fig. 6 is a detailed perspective view of the slide for supporting the rotary work holder on the main tool slide.

Fig. 7 is a perspective view of the mechanism for longitudinally shifting this improved rotary work holder and rotating it.

Fig. 8 is a detailed perspective view of the trip mechanism operated by-the main tool slide for operating the clamping means of the rotary work holder to clamp the work.

Fig. 9 is a detail perspective view of the transverse or cross slide carrying the severing tool and of the swinging finishing tool associated therewith and operated thereby.

Figs. 10 to 13 illustrate the operative positions of the rotary work holder and its associated finishing tool and cutoft tool during their several movements. and

Fig. 14 is a perspective view 0 piece of work.

Similar characters of reference indicate corresponding parts in the several views.

Before explaining in detail the present im- 50 provement and mode of operation thereof, we desire to have it understood that the invention is not limited to the details of construction and arrangement of parts illustrated in the accompanying drawings since the invention is capable 5 a completed of other embodiments, and that the phraseology which we employ is for the purpose of description and not of limitation.

While this improved pick-up attachment may be used with automatic machines having a single spindle and a shiftable tool slide, it is shown in the present instance embodied in an automatic multiple spindle machine having an indexible work spindle carrier 2 provided with a series of rotary work spindles 3 rotated in the usual way from the main driving shaft 4 and which driving shaft passes axially through a main tool slide 5 axially supported relative to the work spindle carrier 2 and carrying the usual tools for working on'the ends of the stock rods, this main tool slide being reciprocated by a cam drum mounted on the usual cam shaft of the machine.

Mounted on the main tool slide 5 is a supplemental or auxiliary slide 6 shiftable longitudinally on the main tool slide. slide is a rotary pick-up work holder comprising a housing I having therein a rotary spindle 8 carrying a suitable collet or clamping or chucking mechanism 8 therein, all of which is similar in a general way to the rotary spindle mechanism of the indexible carrier and, therefore, requires no detailed description.

This rotary spindle 8 is rotated by a shaft 9 bolted to the end of the spindle and has a gear l splined thereon in mesh with a gear ll carried by the main driving shaft 4 of the machine and, therefore, is rotated at the same speed and in the same direction as the rotary spindles of the indexible carrier.

The auxiliary slide 6 carrying this rotary work holder is shifted back and forth on the main tool slide by the mechanism shown in Fig. 7 comprising suitable cams l2 on a cam drum l2 mounted on the usual cam shaft of the machine and link and rod mechanism l3 connected to an arm ll adjustably connected to a rod I! connected with an ear I6 of the housing I of the rotary work holder. The cams are so formed and positioned on the cam drum that. at the proper time and when the indexible work spindle carrier has carried the work or stock rod into position to be severed by the severing tool, the rotary work holder will be shifted forward on the main tool slide to clamp the end of the stock rod and when the end or piece of work has been cut off from the main stock rod, it will then be shifted backward part way to permit the finishing tool to be brought into axial alignment with the cut of! piece of work at which time the rotary work holder is again moved forward so that the finishing tool may properly perform its operation after which the rotary work holder is retracted to permit the completed piece of work to be ejected.

As before stated, the rotating spindle 8 of the auxiliary rotary work holder has suitable clamping or collet mechanism for clamping the end of the stock rod before it is severed from the main stock rod carried by the rotary work spindle and this clamping mechanism is operated to clamp the work on the advancing movement of the tool slide 5. For that purpose, this tool slide is provided with a suitable latch or trip Il bolted to one face thereof and in position to engage the sear l8 of a swinging finger l9 fixed to the housing 1 of the rotary work holder and this finger l9 operates the chuck spool shifting yoke 2i mounted on the rod i5 for actuating the spool 22 and thereby the collet in the usual way to clamp it on to the work at the proper time,

Carried by this The auxiliary slide 6 has a concaved or cut-out portion 23 to accommodate the grooved spool 22. When the rotary work holder of the pick-up attachment is, by means of the cam mechanism hereinbefore referred to, shifted along the main tool slide and into position to contact with the end of the stock rod carried by the rotary work spindle, the main tool slide 5 during its advance movement carries the latch or trip I! into posi tion to contact with the sear l8 of the link i3. This link then pushes the yoke 2| and thereby the chuck spool 22 over the rocking fingers 25 (see Fig. 4), thereby oscillating them to push the conventional collet over its collet seat, thereby gripping the work so that when the cut-off tool cuts the piece off from the bar stock, the piece of work is held securely in the collet of the pickup attachment. At this time the rotary work holder of the pick-up attachment returns part way and thereupon the swinging finishing tool is brought into position in axial alignment with the work to perform the secondary operation.

In this improved pick-up attachment, while,

and iii to clamp the collet on to the ,end of the stock rod, the collet is released when the rotary work holder is fully retracted by some suitable means such as a fixed stud 24 on the machine frame which will operate the spool 22 in the opposite direction to release the collet from the work.

Mounted on the frame work or bed of the machine is the usual transverse or cross slide carrying the cut-off or severing tool 3| for cutting off the end of the stock rod at the proper time, this slide being operated by suitable cams carried by a cam drum 33' mounted on a transverse shaft in the usual way and this slide is utilized to operate the swinging finishing tool although it may be independently operated if desired.

Bolted to this machine frame is a bracket 32 (see Fig. 2) and pivotally supported by this bracket is a swinging arm 33 to which is bolted a tool holder 34 carrying a finishing tool 35 of a form suitable for the work to be done, such as boring, drilling, facing, chamfering, reaming, counter-boring, etc. This arm 33 is connected with an car 36 bolted to the cross slide 30 (see Fig. 9) by means of a rod 31, one end of which is connected to the lower end of the swinging arm 33 (see Fig. 2) and on this rod is located a spring 33. Thus, during the forward movement of the cross slide 30 to carry the cut-off tool 3i (see Fig. 5) into position to sever the piece of work from the stock rod, the swinging arm 33 and its too] 35 are swung away from the rotary work holder and as the cross slide 30 is retracted after the end of the stock rod is cut oil, this swinging arm 33 and its tool 35 are swung into operative position to bring the tool 35 in axial alignment with the work spindle 3 and the piece to be operated upon and at which time the auxiliary work holder has been partly shifted backward by the cam mechanism hereinbefore described.

When the finishing tool is in position, the rotary work holder 3 is then shifted forward to have the end of the piece of work clamped thereby operated upon by the finishing tool 35 until this secondary operation is completed. The rotary work holder 8 and its piece of work are then shifted to the rear or fully retracted by the cam mechanism and in position to have the piece of work ejected.

During this movement to the rear or all the way back. the chuck spool 21 is operated by the yoke 2| coming into engagement with the stop rod 24 (see Fig. 7), thereupon shifting the spool to release the fingers 25 (see Fig. 4) and permit the collet to unclamp the piece of work and at this time it is ejected by suitable ejecting mechanism in the form of a spring pressed plunger or ejector 40 located inside the collet (see Fig. 4).

The operation of the several elements of this improved pick-up attachment is illustrated in Figs. 10 to 13, in which it will be seen that, in Fig. 10,- the rotary. work holder carried by the auxiliary slide on the main tool slide has been moved forward by the cam mechanism to clamp the end of the stock rod and that the cutting-oil.

tool 3| carried by the cross'slide 30 has been shifted into position to cut oil the end of the stock rod. At this time the finishing tool 35 is swung out of position. I

In Fig. 11, the piece of work having been clamped by the collet in the rotary work holder and out off, has been shifted away from the main stock rod or work spindle and the finishing tool 35 has been swung into position in axial alignment with the piece of work while the cut-ofl tool 8| has been retracted.

In Fig, 12, the rotary work holder has been again shifted forward to bring the cut-oil piece of work into engagement with the cut-oil. tool 36 for the finishing operation.

In Fig. 13, the rotary work holder has been fully retracted from the finishing tool 35 and the piece of work designated as W. Fig. 14, ejected therefrom.

Thus, it will be seen that after the forward end of the stock bar carried by the rotary work spindle has been operated upon in the usual way, the opposite end thereof after it has been severed from the stock bar can be operated on by the tool 35 or any other suitable form of tool desired so that both ends of the work are completed on the same machine by a very simple pick-up attachment associated with the main tool slide and in which that main tool slide is operative to operate the collet to clamp the work.

Therefore, in this machine during the time that the main tool slide returns to its rear position to clear the tools from the work carried by the work spindles and the spindle carrier indexes, the bar of stock is fed through a work spindle, chucked and the independent pick-up attachment is operated to clamp a piece of work which has been severed from the bar stock and moves this piece of work toward the finishing tool 35 so that the entire secondary operation of this piece of work can be completed during the idle time of the machine without any loss of time and thus greatly reduces the-cost of manufacturing the parts where a secondary operation like drilling, counter-boring, reaming, slotting or other similar operations are necessary.

For instance, on a six spindle automatic machine, the stock is fed out on the first operation in one of the rotary work spindles I of the indexible carrier 2; and the piece is rough formed and partly drilled by a drill mounted on the main tool slide. In the second operation, the work carriex having been indexed, this piece is finished formed on the outside diameter and again partly drilled to two-thirds of its depth. On the third operation, the work carrier being again indexed. the outside diameter of thepiece is shaved or scraped to hold the diameter to extreme accuracy and during this operation the piece is drilled the full depth. In the fourth operation. with the carrier again indexed, the piece is tapped.

On the fifth indexing, the thread behind the hex shoulder is rolled by means of the threading rolls or exteriorly threaded or in some cases where an external threading operation is required in front of the hex, this can be done with a threading die.

In the sixth operation the piece is cut oil from the bar and during that operation this piece is gripped by the pick-up attachment before it is severed from the bar and is then operated on in the manner hereinbefore described.

Thus, it will be seen that this improved pickup attachment co-operates and is associated with the main tool slide located and supported within the periphery of the work spindles, that is to say, the axially supported main tool slide the work spindle carrier without any additional supporting means. By supporting the auxiliary slide on the main tool slide, this enables the auxiliary slide to be very rigidly supported close up to the work, thus avoiding any overhang of the work or rotating spindle and thereby doing away with any chattering or vibration and insuring accuracy of the work and the utilization of the main tool slide to control the operation of the clamping means of the pick-up attachment to clamp the work during the advance movement of the main tool slide permits the use of a simple tripping means to accomplish this purpose which would otherwise have to be a complicated movement by means of cams, levers, etc., operating from the main cam shaft and involving considerably more mechanism and expense and since the main tool slide is always controlled in its forward and backward movement from the main cam shaft, exact timing of the auxiliary pick-up is obtained while. asbei'ore stated, the auxiliary pick-up is always main tained in alignment with the work spindle.

It is to be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms 01' the several claims or the requirements of the prior art.

Having thus explained the nature of our said invention and described a way of constructing and using the same. although without attempting to set forth all of the forms in which it may be made, or all of the modes of its use, we claim:

1. An automatic machine havinga rotar work spindle, main tool and auxiliary slides having relative longitudinal reciprocating movements. r tatable clamping means carried by the auxl'ary slide and rotatable in the same direction and'at the same speed as the rota y work spindle. cut-off means and finishing means operative in succession, and means operative by the main t ol sl de for controlling the campng of the work by the clamping means carried by the auxiliary slide.

2. An automatic machine having a rotary work spindle. maintool and auxil ary slides hav ing relative longitudinal rec procating movements, rotatable clamping means carried by the auxiliary slide and rotatabe in the same directi n and at the same speed as the rotary work spindle, cut-off means and finishing means operative in succession, and means operative by the main tool slide during the advance movement of the main tool slide for controlling the clamp ing 01' the work by the clamping means carried by the auxiliary slide.

3. An automatic machine having a rotary work spindle, main tool and auxiliary slides having relative longitudinal reciprocating movements, rotatable clamping means carried by the auxiliary slide and rotatable in the same direction and at the same speed as the rotary work spindle, cut-off means and finishing means operative in succession, means operative by the main tool slide for controlling the clamping of the work by the clamping means carried by the auxiliary slide, and a transverse slide, the successive operation of the cut-oil and finishing tools being controlled by said transverse slide.

4. An automatic machine having a rotary work spindle, main tool and auxiliary slides having relative longitudinal reciprocating movements, rotatable clamping means can'ied by the auxiliary slide and rotatable in the same direction and at the same speed as the rotary work spindle, cut-oil means and a swinging finishing means operative in succession, means operative by the main tool slide for controlling the clamping or the work by the clamping means carried by the auxiliary slide, and a transverse slide supporting said cut-oil means and swinging finishing means, the successive operation of the cutoil' and finishing tools being controlled by said transverse slide.

5. An automatic machine comprising a reciprocating tool slide, a rotary work spindle and a pick-up attachment comprising a reciprocating and rotary clamping means shiftable independently of the main tool slide and rotatable at the same speed and in the same direction as the rotary spindle, a severing means and a finishing means, the latter thrown into operation on the retraction of the former, and means operated by the main tool slide on the advance thereof for controlling the clamping of the work by the clamping means.

6. An automatic machine comprising a reciprocating tool slide, a rotary work spindle and a pick-up attachment comprising a reciprocating and rotary clamping means shiftable independently oi the main tool slide and rotatable at the same speed and in the same direction as the rotary spindle, a severing means and a finishing means, the latter thrown into operation on the retraction of the former, means operated by the main tool slide on the advance thereof for controlling the clamping of the work by the clamping means, and means for ejecting the work on the release of the clamping means.

'7. An automatic machine having an axially supported reciprocating main tool slide and a rotating work spindle, an auxiliary slide associated with and shiftable relative to said main tool slide, rotatable clamping means carried by said auxiliary slide and rotated at the same speed and in the same direction as the work spindle, means carried by the main tool slide for operating said clamping means to close it on to the work during the advance oi. the main tool slide, a transversely operating cut-ctr tool, and a transversely operating finishing tool.

8. An automatic machine having an axially supported reciprocating main tool slide and a rotating work spindle, an auxiliary slide associated with and shiftable relative to said main tool slide, rotatable clamping means carried by said auxiliary slide and rotated at the same speed and in the same direction as the work spindle, means carried by the main tool slide for operating said clamping means to close it on to the work during the advance of the main tool slide, a transversely operating cut-oil tool, and a transversely operating finishing tool operative into position to operate on the work clamped by the clamping means on the retraction of the cut-off tool.

9. An automatic machine having an axially supported reciprocating main tool slide and a rotating work spindle, an auxiliary slide associated with and shiftable relative to said main tool slide, rotatable clamping means carried by said auxiliary slide and rotated at the same speed and in the same direction as the work spindle, means carried by the main tool slide for operating said clamping means to close it on to the work during the advance oi the main versely operating slide, a cut-oil! tool carried thereby, and a swinging finishing tool swung into operative position on the retraction of said slide.

10. An automatic machine having an axially supported reciprocating main tool slide and a rotating work spindle, an auxiliary slide associated with and shiftable relative to said main tool slide, rotatable clamping means carried by said auxiliary slide and rotated at the same speed and in the same direction as the work spindle, means carried by the main tool slide for operating said clamping means to close it on to the work during the advance of the main tool slide, a transversely operative slide, a cut-oil tool carried thereby, and a swinging finishing tool operatively connected with said slide and swung into! operative position on the retraction of said slide.

11. An automatic machine having an axially supported reciprocating main tool slide and a retating work spindle, an auxiliary slide associated with and shiftable relative to said main tool slide, rotatable clamping means carried by said auxiliary slide and rotated at the same speed and in the same direction as the work spindle, means carried by the main tool slide for operating said clamping means to close it on to the work during the advance of the main tool slide, a transversely operating cut-oi! tool, a transversely operating finishing tool, and means operative on the retraction of. the auxiliary slide for releasing the clamping means.

12. In a machine of the class described having a rotatable work spindle and a reciprocating main tool slide shiftable toward and from said work spindle, the combination of an auxiliary slide associated with and movable independently of but in the same direction as the main tool slide, rotatable means carried by said auxiliary slide for clamping the end of the work carried by the rotatable work spindle and rotatable with and at the same speed and in the same direction as the rotatable work spindle, means for shifting said auxiliary slide toward the work spindle to clamp the work, then partly backward therefrom, then toward said spindle and then to fully retract it, means operative by the main tool slide on its advancing movement to clamp the rotatable means or the auxiliary slide on to the work, means operative to sever the work when it is clamped by said rotatable means, and means operative into position to operate on the piece,o1 work after it is severed and during the second advance or said rotatable means toward the work spindle.

13. In a machine of the class described having a rotatable work spindle and a reciprocating main tool slide shiftable toward and from said work spindle, the combination of an auxiliary slide tool slide, a transing--a.:rotatable'work spindle and. an axially supixported reciprocating 'main tool slide toward and fromsaid workspindle, .thecombina- "tionof'an auxiliary slide carriedbyandshiftable :relative to saidaxially supported main tool slide,

' associated -"with and movable independently oi butslinithe sameoirection; :as ithetmaini tool. slide, rotatable 'means' carried "bysaid zz-auxiliar-y :islide '1. foraclamping thezend rof. the'work' carrie-d byzthe rot'atable workspindle and:rotatablezwithaand at the: same? speedrrand-iinfjthe same directiontas the =rotata-ble work w'spindle, zmeansffor .a shifting rsaid :aauiiliaryz slider towardthework spiri'dleto clamp :thezwork; theniipartly backward'therefrom; then L means Operative by the. main: tool slide onits adtoward'said'spindleHand then'itoiifully retractlit,

'vancin'g'movement to. clamp the rotatableigmeans of 1'the. aux'iliary. s'lide ron to: the work; meansoperative toseverthework when-it is clamped-by said "rotatable meanarand means operative into :position to operate. on the piece ofwork after. it is severed .and during" the second advance-of said rotatable :smeans toward the "work spindle and shiftable .& into operative position -..'du'rin'g '-'.the"retraction of the severing tool.

1 14. .iIn;a machinetof 'the class described having .a vrotatable work spindle and I. a 1 reciprocating '1 main tool. slide shiftable toward and .IflOm said iwork spindle, the combination of "an auxiliary slide 3 associated withand' movable independently oft but in the same i..direction as ithe main tool slide, i rotatable means carried by said =-auxiliary slide for clamping thezend of the" workcarried by the rotatable cwork. spin.dle..and rotatable with an'dat the same speedaand .in' the 'same idirection as the rotatable work-spindle, means/for shifting said auxiliaryv slide towardthetwork spindleto clamp the work,ithen .partly baokwa'rdl therefrom,

I -ther towardsaidspindleand'ithen'to .fiil'ly 'retract it, means operative; by the .main tool-slide on its advancing movement to-tclamp thesrotatable means of the auxiliary. slide on to the work, means. operative to sever the work when itis clamped by said rotatable..means, means iopera- .tive intoposition to. operate?on'ithepiecei ofwork after it is severed andtduring the secondradvance of said rotatable means :toward' theww-o'rk spindle,.a slide carrying .the severing means-rand swinging means: for carrying .the'means operative into position tooperatei'onthe work after: it. is severed.

15. In a mach-ine'of the class described having r a rotatable work spindle andareciproc'atingmain means of the auxiliary :slide 70112130 the "work,

means operative to sever the work when ,1 it -.is clamped by said; rotatable means; means operative into position to operate onthezpieceroftwork after it is severe'dand during'thesecondadvance 1 of said rotatable meanstoward th work'i spindle,

a slide carrying the severlngimeans';*and swing- .ing means for carryingathe? operativeiin toposition to operate 'on the work' aterit,is

severed, the said'swingingrrnieansv connectedwith said slide and'swunginto operativexpositionon 1 the retraction of the severing?-meansvzslide'.

16'. In a a machine or the class described'ihavshiftable rotatable means carried by said auxiliary. slide 1' for clamping the end of the work carried by the rotatableworkspindle and rotatable withand at the same speed and in the same direction'as the rotatable work spindleQmeans for-shifting said auxiliaryv slide toward the work spindle to .,clamp the work, then partlybackward therefrom, then toward said spindle and then to fully-retract it, means operative by the main 1 tool-slide on itsadvanoing movement to clamp ctherotatable means of the auxiliary slide-on to the work, means'operative to' severthe work when it is clamped by said rotatable. means, and "means operative into position to operate on the piece of work after it is severed and duringthe' second advance. of said'rotatable meanstoward the work spindle.

$17. In. amachine of theclass described having .-a rotatable work spindle and a reciprocating main toolslide. shift-able toward and from said: Work spindle and a cam shaft, the combination of an auxiliary slidelassociated with and movable independently of but in the same direction as the. :main'tool slide, rotatable means carried bysaid auxiliary slide for'clamping the end of the work carried by-thc rotatable work spindle and rotatable with and at the same speed and in the same direction as the rotatable work spindle,'means for-shifting said auxiliary slide toward the work spindleto clamp the work, then partlybackward therefrom, then toward said spindle .and then to .fullyretract it, means operative bythe main tool slide onits advancing movement to clamptthe rotatable'means of the auxiliary. slide on to the work, means operative to sever the'work when itaisclampedby said rotatable means, means operative into position to. operate on the pieceof work after it is severed andduring thesecond 'advance,ofsaid rotatable means toward the work spindle, and cam mechanism carried .by the. cam

shaftfor shifting the auxiliary slide.

.18." In a machine of the class described having a. rotatable work spindle, a reciprocating main tool slide shiftable toward andirom said work spindle, a cam shaft and a main driving shaft for :rotating the work spindle, the combination of an ,auxiliary slide associated with and movable independently of but in the same direction. as the main tool slide, rotatable means carried bysaid auxiliary slide for clamping the end of the work carried by the rotatable work spindle and rotat- -ablewith and at the same speed and in the'same direction as the rotatable work spindle, means for shifting said auxiliary slide toward'thework spindle to clamp the work, then partly backward therefrom, then toward said spindle and then'to fully retract it, means operative, by the main tool islideon its advancing movement to clamp the rotatable means of the auxiliary slideonto the workymeans operative'tosever the work when itls clamped by said rotatable means, means operative into position :tooperate on :the ;piece' ..of work after it is severed and diirlng the second advance of said rotatable means toward the work ,spindl'e, cam mechanism carried by the cam shaft "ion-shifting the auxiliary slide, and means con- "nected'with the main driving shaft for rotating Jsaid rotatable-rmeans carried by the auxiliary slidel machine of the class described having a rotatable work spindle and a reciprocating main tool slide, one shiftable toward and from the other, the combination of a work-pick-up means and means for operating it, a transversely operative slide, means carried thereby and operative to sever the work when it is clamped by said pick-up means, cam means for positively shifting the slide and its severing means forward and backward, and swinging means operative into position on the retraction of said slide to operate on the piece of work after it is severed.

20. An automatic machine having one or more rotary work spindles, a driving shaft for rotating said spindle or spindles, an axially sup ported main tool slide, an auxiliary slide associated therewith, said slides having relative longitudinal reciprocating movements toward and from the work spindle, cam mechanism for re'ciprocating said auxiliary slide relative to the main tool slide tosuccessively advance it toward the work spindle and away therefrom, then toward the work spindle and then to fully retract it, rotatable clamping means carried by the auxiliary slide and rotatable in the same direction and at the same speed as the rotary work spindle and driven from said driving shaft, means carried by the main tool slide for operating the rotatable clamping means carried by the auxiliary slide on the advance 0! said main tool slide, means for releasing said clamping means, a transversely operating slide, cut-01f means carried thereby, a swingingly supported finishing means operatively connected with said transverse slide, said cut-oif means and finishing means operative in succession, the finishing means swung into operation on the retraction of the cut-oil means, and means for ejecting the finished piece of work from the clamping means.

21. In a machine of the class described having a rotatable work spindle and a reciprocating main tool slide, one shiftable toward and from the other, the combination. of a work pickup means and means for operating it. a transversely operative slide, means carried thereby and operative to sever the work when it is clamped by said pick-up means, and swinging means operatively connected with the transverse slide and operative into position on the retraction of said slide to operate on the piece of work after it is severed.

22. An automatic machine having a rotary work spindle, a main tool slide, an auxiliary slide mounted on the main tool slide, said slides having relative longitudinal reciprocating movements, rotatable clamping means carried by the auxiliary slide and rotatable in the same directionand at the same speedas the rotary work spindle, means operative on the movement of the main tool slide for controlling the clamping of 'the work by said clamping means, and cut-off means and finishing means operative in succession.

23. An automatic machine having an indexible work spindle carrier provided with a plurality of rotatable 'work spindles, a reciprocating axially supported main tool slide adapted to carry'tools co-operating with the work carried bythework spindles, an auxiliary slide supported by the main tool, slide, said slides having relative longitudinal reciprocating movements, a rotatable clamping means carried by the auxiliary slide and supported in axial alignment with one ot the work spindles and rotatablein the same direction and atthe same speed as said rotary work spindle, cut-oil means and finishing means operative in succession, and means operative by the main tool slidefor controlling the clamping of the work by the clamping means carried by the auxiliary slide.

24. An automatic machine having an indexible work spindle carrier provided with a plural- 'said' auxiliary slide and rotated at the same" speed and in the same direction as said work spindles, means carried by the main tool slide for operating said clamping means to close it on to the work during the advance of the main tool slide, a transversely operating cut-off tool, and a transversely operating finishing tool operative into position to operate on the work clamped by the clamping means on the retraction of the cut-ofl tool.

25. An automatic machine having an indexible work spindle carrier provided with a plurality of rotatablework spindles, a reciprocating main tool slide adapted to carry tools co-opcrating with the work carried by the work spindles, an auxiliary slide supported by the main tool slide, a work pick-up means carried by said auxiliary slide and means for operating it, a transversely operative slide, means carried thereby and operative to'sever the work when it is clamped by said pick-up means, and swinging means operative into position on the retraction of said transverse slide'to operate on the piece 01' work after it is severed.

ALFRED E. DRISSNER. ROBERT BEACOM.