US1990527A - Tool carrier for metal working machines - Google Patents

Description

Feb. 12, 1935:

M. S. CURTIS TOOL CARRIER FOR METAL WORKING MACHINES Filed June 29, i932 5- Sheets-Sheet l M m TTORNEY Feb. 12, 1935. M. s. CURTIS TOOL CARRIER FOR METAL WORKING MACHINES 5 SheetsSheet 2 m vvwn v lllllllwvw Filed June 29, 1932 INVENTOR I ATTORNEY Feb. 12, 1935. M. s. CURTIS TOOL CARRIER FOR METAL WORKING MACHINES Filed June 29,1932 3 Sheets-Sheet 3 NVENTO-R ATTORNEY Patented Feb. 12, 1935 TOOL CARRIER FoR METAL WORKING MACHINES Myron S. Curtis, Pawtucket, R. 1., assigl'rior to William Wallace Potter, Pawtucket, R. I.

Application June 29, 1932, Serial No. 620,038

7 Claims.

T on reciprocating carriers or slides, it is desirable,

as in machines of the type in which a plurality of tools are simultaneously in action on the work to give certain of the tools a different rate of or different direction of feed than others. Thisis particularly desirable in machine tools having a multiplicity of spindles each with a work-piece and in which a number of work-pieces are simultaneously acted upon by different cutting tools and all the tools being carried on a single slide. Accordingly, a specific objectof my invention is the enabling of different rates of feed of different simultaneously acting tools, but my invention con-* sists in whatever is described by or is included within the terms or scope of the appended claims.

To exemplify one embodiment of my invention, especially as I have developed it in connection with such a machine, 1 illustrate and will describe it in the multi-station type machine which forms the subject of a copending joint application in the name of William Wallace Potter and myself, Serial No. 542,156 of 1931.

In the drawings:

Figs. 1 and 2 are respectively longitudinal sections with parts in elevation of enough of such a machine as that of said application for patent showing the tool carrying head at different points of movement;

Figrla is an end view of the tool carrier;

Fig. 3 is a longitudinal section of an embodiment of my invention by which the same tool may be moved in different directions for cutting;

Fig. 4 is an end elevation thereof;

Fig. 5 is a detail top plan view of the tool head;

Fig. 6 is a longitudinal section ofanother construction for accomplishing the object of whatis shown in Fig. 3;

. Fig. '7 is an end elevation thereof;

Figs. 8 and 9 are respectively detail views in side elevation and top plan of the tool head.

7 As in the machine of the'aforesaid application, there is a rotatablespindle carrying head 10, for a plurality of axially parallel spindles, each of which has a work-piece chuck, 11, and a reciprocating carrier or slide 12, mounted to slide on a support 13,;with which the spindles in a circular group are concentric and the slide carrying a plurality of tools for simultaneous action upon work in the various chucks. With the mechanism for reciprocating the tool slide and rotating the circular group of spindles, my present invention has nothing to do, and, therefore, no further description of theparts just generally mentioned is necessary.

I describe first what appears in iil'aand 2 of the drawings. o In the drawings, besides the tool holderll l, whose rateof feed is that of the slide 12, I-show one other tool holder 15, which besides movement with the slide 12, is given an additional ,feed movement so that its rate of feed is accelerated compared with that of other tools. Such'other. tool holder is in the form of a tubular bar whose longitudinal axis alines'with the longitudinal axis of the spindle which carries the opposite chuck 11, shown in'Fig. 1, and it is mounted, to-slide longitudinally in a hole 16, in the slide at the end nearest the chuck and in a bushing 1'7, at the opposite end of the slide 12. At its end next thechuck 11, thetool holder 15,- has a tool head 18, for attachment of the desired tool. Though the tool holder is free to slide, it isrestrained from turning. as by means of radial headed'pins 19, secured at suitable points to the bushing 17,, and projecting inwardly each through a longi: tudinal slot 20, in the wall of the holder.- j 1' H 1 Within the tool holder and free to rotate therein, is a cylinder 21, having a peripheral oblique slot or path cam 22, whichengages the inner end of a radial stud 23,-attached to the tool holder so that by the rotation of the cam as presently described, the tool holder will be moved in its feeding movement over the work-piece and retracted. The cam 21, is fixed to a central shaft 24, which extends rearwardly in the tool holder, and at its rear end has an internally threadedbushing or nut 25, which engages thread 26, on the forward end portion of a rod 27, in axialalinement with the shaft and to accommodate the forward end of which the shaft is made hollow. ,,It will be seen that by longitudinal movement of the shaft nut 25, over the threads 26, the shaft and in consequence the cam will rotate. The shaft is given longitudinal movement by having the inner ends of the radial pins 19,engage each an opening in the shaft, it thereby being connected and moving with carrier 12. i I

The rod 27, has a limited amount of longitudinal or axial movement but is restrained from such movement at the time revolution of the'cam 22 to move the tool holder is required. To accom-r plish this, it extends at its rear portion through a holein a bushing 28, which is secured to the tail-stock portion of the rear housing 29. And on opposite sides of said bushing, said rodzhas two sets of stop collars 30 and 31, respectively, the

rear end portion of the rod being threaded for the adjustment of such stop collars with reference to the bushing sides.

The rod 2'7, though free to have a limited longitudinal movement, is at all times held from radial pins 19.

As shown in Fig. 1, the slide 12 which carries all of the tools is in its position furthest from the work and in that position the stop collars abut against the forward side of the bushing 28, while the stop collars 31, are spaced away from the bushing and the cam path 20 will be in the position inwhich the tool holder 15, is fully retracted. Forward movement of the slide 12 now taking place, to carry the tools to the work, the rod 2'7, by friction of the nut 25, on its thread 26, will be carried forwarduntil the rear stop collars 31, engage the bushing 28, and stop further onward movement, whereupon feeding movement of the slide 12, continuing, the nut 25 will be drawn over the thread 26 (the rod 27, being held from rotation) and the cam 21,'thereby revolved with the result that the tool holder 15 will be moved forward faster than it is moving with the slide 12. The angle of the cam path 22,'determines the rate of acceleration of feed and different rates may be obtained by variations in the cam angle and indeed deceleration of feed may be produced by selection of a cam path that will accomplish that result in which'case the tool will move slower than its movement with the slide 12.

On the return movement of the slide 12 after the tool has finished its action, the rod 27, will move with the slide until the stop collars 30, prevent further movement whereupon by the rearward travel of nut 25, over the thread 26, the reversed revolution of the cam will take place and the tool holder 15 restored to the first-described position.

In Figs. 3 to 9 of the drawings, constructions are shown by which the to and fro movements of the tool carrier or-slide are utilized to produce or cause movement of the tool in acting on the work transversely of the spindle axis 'as well as longitudin'ally of the spindle axis.

Describing what is shown in Figs. 3 to 5, the tool carrier or slide 12 (which is similar to that in Figs. 1 and 2) supports spaced apart bushings 35, in axial alinement with the spindle, a tubular tool holder 36, which is free to move longitudinally in the same direction in which the slide 12, moves, but such tool holder is restrained from rotation. At the end of the holder 36, towards the chuck is mounted a tool head which comprises a plate 37, fixed to such end of the holder 36, and on the forward vertical side of such plate is rigidly fixed a slide base 38, which at the bottom has spaced apart gibs 39, that have sliding contact with an adjacent fiat face of the tool slide 12, and thereby the tool holder 36 and attached parts are kept from rotating while free'to slide to and fro.

Mounted to slide crosswise of the base 36,'in a usual'way, is a tool holding slide 40, with a T- slot in-its face for attachment of the desired tool, to the back of which is fixed a transversely extending rack 41, with which a pinion 42, concentrio with the axis of the tool holder 36, meshes, so that by the rotation of the pinion, as presently described, transverse movement may be imparted to the tool'slide 40. Said pinion is fixed to the forward end of a shaft 43, mounted within the tool holder 36, concentric therewith which is free to rotate but is held against longitudinal movement, and to the rear portion of said shaft 43, is fixed a sleeve 44, which on its periphery has an obliquely extending slot or path cam 45, with which engages the inner end of a radially extending pin or roller 46, that is mounted in a fixed position on the tool slide 12, the angle of the cam path 45, being such that by movement of the: pin or roller 46, with the slide 12 and restrained longitudinal movement of the cam, rotation of the cam will result, with the result that the meshing pinion and rack will act to move the tool slide 40 transversely.

It is desired that the tool holder 36, shall have limited longitudinal movement with the tool carrier 12, and thereafter shall be immovable longitudinally as the tool slide 12 continues its movement, and it is during the arrested longitudinal movement of the tool holder 36, that the rotation of the cam takes place. To accomplish that, there are stop collars or nuts 47 and 48, respectively, applied to the tool holder 36, the former coacting with a fixed stop such as the adjacent end of the bushing, and the latter 48, coacting with a fixed stop in the form of a bushing 49, in a hole in the rear main housing 50, through which the tool holder 36, extends rearward with the stop 48, in rear of thebushing 49. Between the two stops, lock collars 51, are threaded on the tool holder 36, and a spring 52,extends between'such collars and the end of the bushing 35, in rear thereof, so that normally and yieldingly by the pressure of said spring, the tool holder 36, is held with the forward stop collar 47, in contact with the end of the bushing 35.

It will be seen that with the parts in the'position shown in Fig. 3, that forward movement of the tool slide 12, towards the work on the spindle will be accompanied by similar movement of the tool holder 36, until the stop 48, strikes the bushing 49, whereupon the tool slide 12 will continue its movement alone and by the coaction of the cam path 45 and roller 46, the pinion 42, will be revolved and the rack and tool slide 40 thereby be moved transversely. The spring 52 is compressed during this action. Upon the return travel of the tool slide 12, the spring 52 acts to hold the tool holder 36, against longitudinal movement,-with respect to the housing 50, and thereby-by a reverse action of the path cam and pin or roller 46, the tool slide 40 is restored to its original position collar 47, abutting against the forward bushing 35, so that thereafter the tool holder 36, moves rearward with the slide 12;

It will be evident that the direction of the transverse feed of the tool may be at right angles to the spindle axis or at any other desired angle dependent upon the placing of the slide base 41.

Describing what is shownin Figs. 6 to 9, it will be seen that there is a tubular tool holder 360, mounted for longitudinal movement in spaced apart bushings 350, in the tool carrier or slide 12, and there are stop collars 4'70 and 480 on such holder and a spring-engaged collar 51, thereon,

in all of which respects the construction and the action thereof are similar to the corresponding structure of Fig.3. And to the spindle end of said tool holder 36, is secured a slide base380, on

the outer face of which is mounted for transverse movement a tool slide 400, which is held yieldingly at one limit of its motion by a coil spring 520, coacting stops 53 and 54 on slide and base,

limiting the movement of the slide by the spring 520.

Transverse movement of the tool slide 400, against the pressure of spring 520, is produced by coacting cams 55 and 56, respectively, on the main tool slide 12, and the cross slide 400, the cross slide cam 56 being in the form of a pivoted or clapper dog that permits it to trip when necessary over the main slide cam 55.

It will be seen that when the main cross slide 12 moves from its rearmost position towards-the work carrying spindle, the tool holder 360 will partake of that movement until it is arrested by the stop device and thereafter feed movement of the main slide 12, continuing its cam 55 acting on the dog 56 of the cross slide, will move the cross slide tool transversely of the spindle axis. Upon return movement of the main slide 12, the spring 521, holds tool holder 360 against relative rearward movement and the main slide cam 55 moves away from the clapper dog 56, allowing spring 520, to act to return the cross-slide 400, to

its original position until stop 470 and bushing 350, abut, and thereafter tool holder 360 moves rearward with the main tool slide 12.

What I claim is:

1. In a tool feed for machine tools, a tool carrier movable towards and from a work-holder, a tool holder movable with as well as relatively to said carrier and automatic means for moving said tool holder while movement of the tool carrier proceeds, said tool holder being hollow longitudinally and said tool holder moving means comprising an automatically acting member within the hollow holder.

2. In a tool feed for machine tools, a tool carrier movable towards and from a work-holder, a tool holder movable with as well as relatively to said carrier and automatic means for moving said tool holder while movement of the tool carrier proceeds, said tool holder being hollow longitudinally and said tool holder moving means comprising an automatically acting member within the hollow holder, comprising cooperating members one of which moves with said carrier and the other of which is relatively stationary.

3. In a tool feed for machine tools, the combination of a carrier movable towards and from the work-holder of the machine, a tool holder slidable on the carrier in the direction of its movement, said tool holder being hollow, a cam within the tool holder, tool holder and cam having interengaging parts and means to rotate the cam comprising cooperating members one of which is connected with and moves with the carrier and the other of which is relatively stationary.

4. A mechanism as in claim 1 in which there is a plurality of work-holders and a plurality of tool holders, certain of the tool holders having movement only at the rate of movement of the carrier.

5. A mechanism as in claim 1 having means to cause relative movement of tool holder and carrier during only a portion of the movement of the carrier.

6. In a tool feed for machine tools, the combination of a carrier movable towards and from the work-holder of the machine, a tool holder slidable on the carrier in the direction of its movement, said tool holder being hollow, and a cam within the tool holder, tool holder and cam having interengaging parts that cause rotation of one by longitudinal movement of the other and automatic means that causes such longitudinal movement.

'7. In a machine tool, the combination of a plurality of work holders, a plurality of tool holders, a carrier for all of the tool holders movable towards and from the work holders, certain of the tool holders having movement only at the rate of movement of the carrier and automatic means acting on other tool holders that impart movement thereto different from that with the carrier at least one of such last-mentioned tool holders having said automatic means that includes a member within a space within such tool holder.

MYRON S. CURTIS.

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