US2255170A - Machine tool - Google Patents

Description

Sept. 9, 194i.

E. E. KELLEY MACHINE TOOL Filed Sept. l5, 1939 TOPA/Ey Sept 9, 1941. E. E. KELLEY 2,255,170

MACHINE TOOL I Filed Sept. l5, 1939 2 Sheets-Sheet 2 Patented Sept. 9, 1941k MACHINE TOOL Elmer E. Kelley, Hartford, Conn.

Application September 15, 1939, Serial No. 294.991

17 Claims.

My invention relates to machine tools.

It has among its objects to provide an improved machine tool of the parallel spindle, so-called two-at-a-time type, described and claimed in my Patent No. 2,201,182, issued May 21, 1940. A further object of my invention is to provide improved timing means for the transverse tool slide of such a machine and an improved arrangement of tools thereon, whereby it is made possible, whilehalving the number of tools required on this slide and consequently minimizing difficulty with the cuttings, to maintain the same production as previously obtained with four tools. Still further objects -of my invention are to provide improved operating mechanism for the cross slide, and, more particularly, to provide improved cross slide operating cam mechanism whereby the above results are obtained while enabling the drive cam to be driven at the same speed as heretofore. Other objects of my invention include the provision of an improved timing relation between this mechanism and the vertical cut-off mechanism, as well as the longitudinal tool carrier, whereby these cooperating mechanisms function in an improved sequence with respect to the new movement of the transverse tool slide during the operation of the machine. These and other objects and advantages of my improvements will, however, hereinaiter more fully appear.

In the accompanying drawings, I have shown for purposes of illustration one embodiment which my invention may assume in practice..

In these drawings- Figure 1 is a side elevation of a portion of a two-at-a-time machine equipped with my improvements;

Fig. 2 is a section on line 2-2 of Figure l;

Fig, 3 is a section on line 3-3 of Figure 2;

Fig, 4 is a section on line 4-4 of Figure 2;

Fig. 5 is a detail perspective view of my improved double-lcbed cam, and

Fig. 6 is a detail view showing this cam in slide projecting position.V

In this illustrative construction, I have shown my invention applied to a machine of the two-ata-time construction of my patent mentioned, and also provided with vertical cut-off mechanism of the type described and claimed in my Patent No. 2,201,183, issued May 21, 1940; this machine being provided with improved cross slide operating mechanism whereby two tools carried on the cross slide are enabled to perform the functions of the four previously provided, while the cross slide operates in a new timed relation with the longitudinaly tool carrier and the vertical vcut-ofi tools, all as hereinafter more specifically described.

5 In this construction, a machine is shown having a head stock I and a gear box 2 and parallel spindles 3 projecting from the former toward the latter and having usual cam operated work gripping and feeding mechanism, generally in- 10 dicated at 4. Further, as in my rst mentioned application, the spindles 3 are driven from the gear box by a shaft 5 connected to the spindles through gearing 6, while the feeding'mechanism 4 is driven through gearing 1 from a drive sleeve 8 enclosing the shaft 5. As in my second'mentioned application, this sleeve 8 also drives through a central gear 9, the'actuating cam I0 of an upper transverse slide II so that as this cam engages cooperating rollers I2,-this slide II is operated to actuate generally V-shaped cams I3, having rollers I4 movable., therein 'to raise and lower vertical cut-off slides I5 carrying cut-off tools I6. As in my patent hereinbefore mentioned, a main cam I'I disposed coaxially with the drive shafts 5 and 8 and fixed to the tube or sleeve forming the shaft 8, is also utilized to reciprocate a longitudinally reciprocable tool carrier I8 through a cam follower I 8a on this carrier, in such manner that suitable tools I9, herein drills, on this carrier are operated in timed relation to the other mechanisms heretofore described. Herein, as described and kclaimed in my co-pending application Serial No.

294,990, filed September 15, 1939, the carrier I8 also acts to control swinging stock stopfmeans 20 carried on a sleeve 2| enclosing the sleeve 8, this stock stop means herein being swung about the axis of this sleeve into and out of stock stopping position as the carrier I8 is moved backward and forward, respectively, the reverse swinging movements being effected by a ldepending cam follower 22 on the sleeve 2| and which is actuated by acam slot 23 xed to the top of the longitudinal tool carrier between the tools thereon. Herein also, the sleeve 8 drives through the lower gear of the gearing il previously men-4 tioned, a gear 24 which, in turn, lthrough a shaft 24a operates a cam mechanism, generally indicated at 25, which operates-a cross slide 26 carrying the shaping tools which cooperate with the tools I9 and I6 in acting on the stock rods fed bythe feeding mechanism 4 and stopped in the desired DOSOII by the stock stop mechanism 20.

Herein, howevenaithougn the gear 24 is. stm

rotated through one revolution for each two revolutions of the shaft 8 and cam I1, the tool arrangement on the transverse tool slide 26 and the cam mechanism 25 which forms the operating mechanism for the latter, as well as the timing of the slide 26 relative to the other mechanisms, are, all improved as hereinafter described.

Referring more particularly to my improvements herein. it will be observed that two tools by reason of the.pr'ovision of the dwell'surfaces `3I, a dwell will be provided before the tools 21 and 28 move into cutting position.

Attention is further directed to the new timing relation between this movement of the cross 21 and 28 are provided on the slide 23, each on 10 slide 26 and the longitudinal tool slide I8, feedthe same side, herein the left side as viewed in Figure 2, of the work pieces carried by the different spindles 3, the other set of oppositely disposed -tools on the right hand sides of the spindies, taught in my prior construction, being eliminated. Further, it will be observed that the gear 24 drives improved operating mechanism for this slide 26, herein an improved double lobed cam mechanism, generally indicated at 25. Referring more particularly to this cam mechanism 25, it will be observed that the same includes a large cam 29 which is provided with a plurality of lobes 30 of like construction and oppositely disposed, as distinguished from the single lobe cam previously used. Further, each of these lobes is provided with a dwell surface 3| leading thereto and slightly shorter than the working face on the lobe. The cam 29 is rotated in the direction of the arrow shown in Figure .'Z.`

Moreover, it will be observed that this cam 29 also carries fixed thereto a smaller double lobed cam 32 which is generally diametrically disposed between the ends of the dwell surfaces 3| on diiierentv lobes 30. 'I'his cam 32 has like oppositely disposed side cam tracks or portions 33 extending throughout the length of each side thereof and having. dished portions 33a atopposite ends thereof, while end portions 34 form lateral extensions of the peripheries of the extremities of the dwell surfaces 3| f. It will further be noted that different cooperating rollers 35 and 36 are provided in the slide 26 for cooperation with the cams 29 and 32 thus provided. Of these, the roller 35 is longer than the roller 36 and of such length as to' engage both the dwell portions 3| on the cam 29 and the end portions 34 on the cam 32, while the roller 36 is so narrow as only to ride over the end portions 34 and the cam tracks 33 on the smaller cam 32.

As a result of the provision of thisimproved cam mechanism 25, the transverse tool `slide 26 is operated in a new manner. Thus, during each revolution of the shaft 24a, each lobe 30 of the cam 29 successively engages the long roller 3,5, and as soon as each lobe passes out of engagement'with this roller, one of the working portions 33a on the cam tracks 33 successively engages the short roller 36. As a result, the entire cam mechanism 25, comprising the cams 29 and 32, rotating continuously in a clockwise direction as shown in Figure 2, the slide 26 will be moved to the right by the engagement of the lobes 30 with the long roller 35, and to the left by the engagement of the short roller 36 with the cam portions 33a,'these right and left movements thereof alternating, and the movement to the left being a relatively quick movement. Consequently, during each half revolution of the shaft 24a and cam mechanism 25, the tools 21 and 28 70 tinguished from moving, this slide through one will be moved slowly to the right (Fig. 2) into operative engagement with the work carried lby the spindles, and maintained therein until their work shaping function is completed, whereupon they will then be quickly moved out of engagement with the work and to the left to the i110?- ing mechanism 2, and stock stop mechanism 20. Here, it will be observed that since the shaft 24a moves through one revolution for each two revolutions of the tubular shaft 8, the slide 26 is 15 moved to the' right and back again to the left,

i. e. in such manner as to move through a complete y reciprocatory cycle, during forward. and

back movements. i. e. a -complete cycle of thel longitudinal tool carrier I8 and the tools I9 car` 2O ried thereon. It will also be 'observed that the timing relation with the cut-off mechanism is such that, through the cam III and its associated mechanism controlling the 'operation of the cut- /oif toolsy I6| the latter will move down to cut off the finished work as the same is being finished by the tools 21 and 28; the work being severed after the tools 21 and 28 move to the left into the position shown in Figure 2 and the cut-oil tools I6 again being raised vas .each lobe 30 moves 0, clockwise from the position shown in Figure 2, to

bring the tools 21 and 28 again into cutting poj- Y`sition. Thus, for each cycle of movement ofthe tools 21 and 28, the cutoil! tools I6 will move through a complete cycle,- i. e. into cutting oil 35 position and back to inoperative position. Moreover, it will be observed that since lthe stock stop means 20 is also moved through a complete cycle as the carrier I8 moves through its cycle, the relationship `of the movement of the transverse .4o tool slide 26 to the stock stop means 20 and the stock feeding means 4`is such that as the tools 21 and 28 are moved during each cycle thereof, the stock rods-are fed forward `,by the feeding mechanism 2 after each cutting-olf operation of the cut-off tool I6, while the stock stop means 20 ismoved into position to stop the rods at the proper point, and is then moved out of the path of the rods to permit the tools I9 on the longitudinal tool carrier I8 to function.

As the operation of the mechanism will, it is believed, be clear from' the above, it is believed to be unnecessary to review the same in detail. It will, however, be observed that as a result of the new cam mechanism 25 and the new timing relation between the transverse slide 26 and the longitudinal tool carrier I8, it is made possible not only to move the transverse slide through a complete cycle for each cycleof movement of the carrier I8 and thus enable a single pair of tools o to perform the function of the two pair of tools previously provided, but also to maintain the desired sequence of operation of the tool slide with all the cooperating mechanisms of the machine, despite this fundamental change in timing of the transverse tool slide. More particularly, it will be vapparent that while my improved cam mechanism will operate the transverse tool slide through two complete cycles of movement thereof for each revolution of the shaft 24a, as dis- ,75 gitudinal tool slide now moves through a complete cycle for each cycle of movement 'of the transverse tool slide, as distinguished from a full cycle for each half cycle of movement of the latter, and despite the further fact that the vertical cut-off tools now moveto cutting-oft position once for each cycleof movement of the transverse tool slide, as distinguished from once for each half cycle of movement thereof.

As a result of my improved construction, it is.

made possible to halve the number of transverse tool slide tools provided, thereby substantially reducing the expense by eliminating both the tool supports and the tools. Atthe same time, it is made possible very materially to increase the space available for cuttings. Further, the number of tools having to be kept under the supervision of the operator is similarly halved, as well tool slide and its operating mechanism. These and other advantages of my improved construction will, however, be clearly apparent to'those skilled in the art. While I have in this application specicall described one embodiment which my invention may assume in practice, it will be understood that this form of the same is chosen for purposes of illustration, and that the invention may be modiiied and embodied in various other forms without departing from its spirit or the scopev of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a machine tool, work rotating means including a spindle, longitudinally reciprocable tool carrier means having a tool operative on work in said spindle, a rotatable cam shaft having a cam reciprocating said carrier through one complete cycle of operation with each rotation thereof, tool slide means movable transversely of said spindle and likewise operative on said work, a cam shaft rotatable at half the speed of said rst mentioned cam shaft, and cam means on said second mentioned cam shaft for reciprocating said transversely movable tool slide positively through one complete cycle of operation for each corresponding cycle of operation of said tool carrier means.

2. In a machine tool, work rotating means including a spindle, longitudinally reciprocable tool carrier means loperative on work in said spindle,

-transverse tool slide 'means likewise operative thereon, means for actuating said transverse tool slide through a cycle of operation foreach cycle 'of operation of said tool carrier means, and cutoif meansincluding tool slide means vmovable in a direction transverse to the paths of said carrier means and transverse tool slide means and movable through a cycle of operation for each cycle of operation of said transverse tool slide means.

3. In a machine tool having a plurality of spindles, longitudinally reciprocable tool carrier means having tools thereon simultaneously cooperating with work in said spindles, a. rotatable cam shaft reciprocating said carrier through one complete cycle of operation with each rotation of said shaft, tool slide means movable transversely of said spindles including a single tool for each spindle operative simultaneously on the work in said spindles, a second cam shaft rotatable at half the speed of said rst mentioned cam shaft, and cam means on said second mentioned cam shaft for reciprocating said transversely movable tool slide positively in both directions through one complete cycle of operation for each corresponding cycle of operation of said tool carrier means. Y

4. In a machine tool having a plurality of spindles, longitudinal tool carrier means simultaneously cooperating with work therein, transverse tool slide means including single tools on the same side of different spindles, means forvmoving said transverse tool slide means through a cycle of operation for each cycle of operation of said longitudinal tool carrier means, and cut-olf means cooperating with the work in each spindle including tool slide means movable in a direction transverse to the paths of said carrier means and transverse tool slide means and movablethrough a cycle of operation for each cycle f operation of said transverse tool slide means.`

5. In a machine tool, aplurality of spindles, reciprocable tool carrier means movable longitudinally of said'spindles and carrying tools simultaneously cooperating with work in said spindles including a driving shaft driving said carrier means through a complete cycle of movement for each revolution of said shaft, a tool slide movable transversely of said spindles having a tool for each of said spindles, and doublelobed cam mechanism rotatable at half the speed of said driving shaft and moving said transversely movable slide positively in both directions through a cycle of operation for each cycle of operation of said longitudinal tool carrier means.

6. In a machine tool, a plurality of spindles, longitudinally reciprocable tool carrier means 'carrying tools simultaneously cooperating with ,through one cycle of operation for each cycle of operation of said longitudinal tool carrier means, and cut-od mechanism for the work in each spindle including tool slide means movable in a direction transverse to the paths of said carrier means and transverse tool slide means and movable through one cycle of operation for each cycle of operation of said transverse tool slide means.

7. In a machine tool, a plurality of spindles, longitudinally reciprocable tool carrier means means carrying tools simultaneously cooperating with work in said'A spindles, a main cam shaft driving said carirer means through one cycle of movement for each revolution thereof, a transverse tool slide having single tools on the same side of the work in said spindles, double-lobed cam mechanism rotatable at half the speed of said main cam shaft and moving said transverse slide through a cycle of operation for each cycle of operation of said longitudinal tool carrier means, and work feeding mechanism movable through a cycle of `operation for each cycle of operation of said transverse tool slide means.

8. In a machine tool, a tool slide having a tool thereon, and double-lobed cam mechanism operatively connected to said tool slide and including two double-lobed cams moving said slide through two complete cycles of operation for each revolution of said cam mechanism,

cluding a double-lobed cam having each lobe thereof moving said slide positively in one direction, said mechanism also including a second double-lobed cam having its lobes intermediate the lobes on said rst mentioned cam and having each lobe thereof moving said slide in the other direction, and cooperating rollers on said slide cooperating with said cams and including a long roller engaging both cams and a short roller engaging only said second mentioned cam.

11. In a machine tool, a tool slide having a tool thereon, and double-lobed cam mechanism operatively connected to said tool slide and including a cam having each lobe thereof moving said slide positively in the same direction, said mechanism also including a second double-lobed cam having its lobes intermediate the lobes on said first mentioned cam and having each lobe thereof moving said slide positively in the same direction, and cooperating rollers on said slide cooperating with said cams, said first mentioned cam constituting means forsfeding said slide to the work and said second mentionedcam constituting means for returning said slide and tool to inoperative position.

l2. In a machine tool, a tool slide having a tool thereon, and double-lobed cam mechanism operatively connected to said tool slide and including a double-lobed cam having each lobe thereof moving said slide positively in one direction and a second double-lobed cam having its lobes intermediate the lobes on said rst-mentioned cam, and cooperating rollers on said slide cooperating with said cams, said mechanism also having dwells on said iirst-mentioned lobes and between working facesof the latter and working faces at the opposite ends' of the lobes on said second mentioned cam.

13. In a machine tool, parallel spindles. a transverse tool slide having a single tool disposed in the same side of the work in each spindle, and a double-lobed camimechanism below and between said spindles and said tools and operatively connected to said tool slide including two double-lobed cams and having adjacent lobes of different cams moving said slide positively through a complete cycle of operation.

14. In a machine tool, parallel spindles, a

transverse tool slide having a single tool disposed in the same side of the work in each spindle, a double-lobed cam mechanism below and between said spindles and said tools and operatively connected to said tool slide, said cam mechanism including two double-lobed cams and having adjacent lobes of different cams moving 1 .operatively connected to said tool slide, said cam mechanism including two double-lobed cams and having adjacent lobes of different cams moving said slide through a complete cycle of operation, and vertical cut-oi means for the work in each of said spindles including a tool slide movable in a direction transverse to the path of movement of said transverse tool vslide and movable through a complete cycle of operation for each cycle of operation of said transverse tool slide.

16. In a machine tool, parallel spindles, a transverse tool slide having a single tool disposed in the same side of the work in each spindle, a double-lobed cam mechanism below and between/said spindles and said tools and operatively," connected to said tool slide, said cam mechanism including two double-lobed cams and having adjacent lobes of diierent cams moving said slide through a complete cycle of operation, and stock feeding means for each spindle `tion, and cooperating longitudinally reciprocable tool'carrier means, vertical cut-off means, and work Ieecung means each cooperating with the work in said spindles and each movable through a complete cycle of operation for each cycle of operation of said transverse tool slide.

ELMER E. KELLEY.

CERTIFICATE 0F CORRECTION. v Palsent'No. 2,255,170. A September 9, 191|l.

- EmERE. Em.

It is hereby certified that error appears in therprnted specification of the above numbered patent requiring correctionas follows: Page 5, second co1u`mn, line 57,'claim 7, strike out the word means"; line 59, same claim, for "carirer" read `--ca'rrLer---g page Il., first column, line 6, claim 9, after "operation"v strike out the comma.; and thatthe saidLetters Patent should beraad .with this correction therein that the Asame may conform to, the record f the case in the Patent Office.

l signed and sealed this .28th day of october, 1.. 1 .v 19m.

, A Henry Van Arsdale (seal) Acting commssroner of Patents.

Images