US2261378A - Stock feed mechanism - Google Patents

Description

Nov. 4, 1941. A. F. JELINEK ETAL 2,261,378

STOCK FEED MECHANISM Filed March 4, 1940 4 Sheets-Sheet 1 INVENTORJ O AZFREDf-ZJEL/NEK M44762 E. 620 55 TTORNEYS.

Nov. 4, 1941. A. F. JELINEK ETAL STOCK FEED MECHANISM Filed March 4, 1940 4 Sheets-Sheet 2 1NVENTOR5 Al/KEDE J'EL l/VEK WHZTER E. GROSS f/ 7M ORNEYS Nov. 4, 1941.

A. F. JELINEK EI'AL STOCK FEED MECHANISM Filed March 4, 1940 4 She ei .s-Sheet 3 INVENTORS ALFRED/57E L NEK 62065 M v WALTEEE. /5

N v. 4, 19 1- A. F. JELINEK ETAL 2,251,378

STOCK FEED MECHANISM 4 Sheets-Sheet 4 Filed March 4, 1940 INVENTORS FPEDfiJfZ/Nfk WALTER E. 6!?053 @r TTORNEY-S Patented Nov. 4, 1941 STOCK FEED MECHANISM Alfred F. Jelinek and Walter E. Gross, Cleveland, Ohio, assignors to The Cleveland Automatic Machine Company, Cleveland, Ohio, a corporation of Ohio Application March 4, 1940,v Serial N 0. 322,184

3 Claims.

This invention relates broadly to automatic screw machines and more specifically to improvements in stock feed mechanisms therefor.

One of the objects of the invention is to provide a cam follower supporting structure which may be readily adjusted in relation to the lift of the cam to vary the travel or longitudinal movement of the mechanism controlled thereby.

Another object of the invention is to construct a stock feed tube assembly which is designed to facilitate the ready removal thereof in dismantling the tube for the purpose of replacement of bearings or similar wear parts in the assembly.

Another object of the invention is to provide a cam drum mounting which is constructed to accommodate rotative adjustments thereof in order to alter-the timed relation of the cam plates mounted thereon with the mechanisms coordinated therewith.

Other objects and advantages more or less ancillary to the foregoing and the manner in which all the various objects are realized will appear in the following description.

Referring to the drawings wherein the preferred embodiment of the invention is illustrated:

Fig. 1 is a side elevational view of an automatic screw machine embodying the present invention;

Fig. 2 is a horizontal section through the spindle head of the machine and a fragmentary portion of the cam shaft housing, the section being taken on the plane indicated by the line 2-2 in Fig. l;

Fig. 3 is a vertical sectional view through the end portion of the spindle head and cam shaft housing, the section being taken on the plane indicated by the line 3-3 in Fig. 2;

Fig. 4 is a vertical sectional View through the spindle housing, the section being taken on the plane indicated by the line 44 in Fig. 2;

Fig. 5 is a longitudinal section of a fragmentary portion of the stock feed actuating mechanism,

the section being taken on the plane indicated by As illustrated in Fig. 1, the screw machine All chosen herein for purposes of illustration comprises a base I0, having a housing H mounted thereon, adapted to support the work. holding spindle l2 and drive mechanism therefor and constructed also to enclose the journal'bearings and driving connections coordinated with the cam shaft l3.

As will be seen in Fig.2, the outer end of the cam shaft is provided with a cylinder or drum l4 having cam plates I5 mounted thereon which are operatively associated with a follower l 6 supported on a sleeve I"! slidably mounted upon a rod l8 retained within the housing H. The sleeve I1 is formed with a yoke l9 (see (Fig. 6) upon the forward face thereof, which is engaged with a groove formed in the hub of the collet actuating cone member 2|. Since the work holding collet and operating mechanism therefor comprises per se no part of the present invention it is deemed unnecessary herein to describe the specific construction thereof in detail other than to state that the operation thereof is effected through the reciprocative movement of the sleeve H, which in turn causes the longitudinal movement of the wedge rings 23 and 24 and the consequent reciprocative movement of the actuating tube 25 for the work holding collet Adjacent the cam Hi there is a second drum 2! having a cam plate 28 mounted thereon which is configured to effect the maximum translation of the stock feed mechanism contemplated in the design of the machine. The cam plate 28 is engaged with a roller 29 mounted upona block I'll) A (see Fig. 4) which is attached to a side 3| mounted for reciprocative movement upon the rod l8. The slide is formed with a T-slot 32 in a face thereof provided for the reception of bolts 33 to accommodate lineal adjustment of the block when it is desired to alter the position of the roller in relation to the inclined face of the cam 28.

The slide 3| is formed with a laterally extended arm 34 having an enlarged annular end portion 34a which is bored for the reception of a sleeve 35 machined to support an anti-friction bearing 36 (Fig. 7). The outer race of the bearing is clamped between ashoulder 31 formed in the sleeve 35 and a threaded ring 38 which is locked in position within the sleeve by a set screw 39. The innerrace of the bearing 36 is impinged between a nut 40 and a shoulder 4| formed in a thimble 42 which is welded to the outer end of the stock feed tube 43. The mouth of the thimble 42 isbored to support the bar stock guide bushing, as is customary in machines of this type, which is retained therein by a set screw. The enlarged end portion of the arm 34 is formed with a slot 44 in the upper face thereof for the reception of an arcuate arm 45 (Fig. 4) pivotally supported upon a pin 46. The arm 45 is 'constructed with a boss in the free end thereof which is slotted for the reception of a pivotally mounted bolt 4'! provided for the retention of the arm in its closed position. The periphery of the sleeve 35 is machined with a groove 48 having the side walls thereof tapered for engagement with the inclined sides of the inner face of the arm 45.

The slide 3| (see Fig. 4) is formed with an arm 49 depending from the body thereof and constructed with a bifurcated end portion which engages a rod 5|] to restrain the slide from rotation upon the rod I8. The rod 50 is supported in a bracket 5| mounted upon the end Wall of the housing I and within an opening in a transverse wall or partition formed in the central portion of the spindle housing. The bracket 5| is constructed With a boss 52 drilled to support the outer end of a guide rod 53 which is disposed within a tube 54 welded in the arm 45 and guided in an arm |9a depending from the yok IS. The tube 54 is provided with a bushing 55 in the end thereof which constitutes a guiding member for the rod 53 and an abutment for the end of a spring 56, the spring mounted upon the guide rod 53 being partially encased by the tube 54 and compressively retained between the bushing 55 and a collar 51 mounted upon the rod 53. The collar 5'! is clamped to the rod by means of a set screw in order to facilitate longitudinal adjustments thereof so that the compressive effort of the spring 56 may be regulated to urge the slide 3| into abutting engagement with a stop 58 mounted upon the rod I8.

The cam drums I4 and 21 are formed with hubs 65 which are bored to rotate freely upon the cam shaft |3. The outer machined faces of the hubs are disposed in abutting engagement with split collars 6| which are clamped upon the cam shaft by bolts 62 retained within laterally extended bosses 63. The contiguous faces of the collars and hub portions 6|] of the drums are drilled and reamed for the reception of dowel pins 54 which constitute driving connections between the drums and collars respectively.

In operation the roller 29 is retained in spring pressed engagement with the inclined face of the cam 28 through the compression spring 56 which bears against the bushing 55 and urges the tube 54 and in turn the slide 3| against the stop 58. As the cam drum 21 is revolved the inclined face of the cam 23 effects the translation of the slide 3| and the consequent movement of the stock feed tube 43 (Fig. 2). When it is desired to alter the length of the reciprocative movement of the stock feed tube 43, i. e. change the stroke of the stock feed mechanism, the bolts 33 supporting the block 30 are released, and While the slide is held against the stop 58 by the spring 56, the block is repositioned longitudinally along the T-slot 32 until the roller 29 engages only such portion of the inclined face 65 of the cam 28 as may be required to effect the desired translation of the slide. Thereupon the bolts 33 are tightened to hold the block in rigid securement upon the slide 3|. In further detail, when the roller block is adjusted to its maximum inner position contact between the roller and the cam face 55 will be made substantially throughout the entire rotative cycle of the cam 28, but when the block 30 is positioned adjacent the outer end of the slide 3| only a portion of the cam face will be engaged by the roller and only such portion of the cam lift will be realized as is required to effect the desired movement of the slide 32 and in turn the required translation of the stock feed tube 43.

Since the spring 56 constantly urges the slide 3| against the stop 58, changes in the position of the roller relative to the cam face will alter the eifective lift of the cam. Thus when the block 30 is moved from the position illustrated in Fig. 2 to the position where the witness mark A on the block is aligned with the point D indicated on the graduated scale S on the slide, the cam follower roller 23 will first strike the working edge of the cam plate 28 at the point (I as the drum is revolved about its axis. Obviously, the resulting translation of the slide will be limited to the movement effected by the cam lift from the point (2 to the peak f of the cam face 55. Likewise, when the block is moved so that the mark A will register with the point C only the portion of the cam lift from the point 0 to 1 will be employed and when the block is moved to the position where the mark A is registered with the point B the segment of the cam from point a to b will rotate past the roller 29 before any movement of the slide 32 may be effected.

As the position of the cam follower supporting block 30 is altered compensative adjustments of the cam drums l4 and 2'! must likewise be made in order to preserve the timed relation of operation between two mechanisms. This adjustment may be effected by merely loosening the nuts 62, then rotating the collars and drums upon the cam shaft to the point where engagement of the cam shoulders with the rollers i6 and 2!] respectively will effect the coordinated relation of the stock feed mechanism with the closure of the work holding collet 26 and the timed order of operation of tools carried by the tool turret 66 and cross slide 61- The construction of the stock feed tube mounting, as provided herein, is designed to accommodate the manipulation of the bar stock to effect the entry thereof through the spring jaws in in the stock feed tube with greater facility and dispatch. In the execution of this operation the pivoted arm 45 is first released and retracted from the groove 48 so that the sleeve assembly, including the stock feed tube 43 may be Withdrawn from the slide. The operator may, thereupon, slightly withdraw the assembly and in the exercise of short reciprocative movement bump the nut 45 against the shell of the enlarged portion 34a of the arm 34 until the bar stock spreads the jaws 13 in the feed tube and is extended therethrough to the desired position. The arm 45 is then repositioned within the groove 48, the tapered side walls thereof effecting the centralization of the sleeve with running clearance between the nut 40 and the inner shell of the arm.

Although the foregoing description is necessarily of a detailed character, in order that the invention may be completely set forth, it is to be understood that the specific terminology is not intended to be restrictive or confining and that various rearrangements of parts and modifications of detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

We claim:

1. A screw machine embodying a gear housing, a work holding spindle and a cam shaft, a cam on said shaft, a rod mounted in said housing,

a slide reciprocatively mounted on said rod, a laterally extending arm on said slide, a stock feed tube connected to said arm and slidably mounted in said Work holding spindle, a second rod mounted in said housing, a yoke depending from said slide engaged with said second rod, a ledge on said slide having a T slot therein, a block on said ledge, bolts in said block engaged in said T slot, a roller on said block engaged with said cam, a spring mounted on said housing normally urging said slide towards said cam, a sleeve on said stock feed tube having an annular groove therein and an arcuate arm hinged upon said laterally extending arm and engaged in said groove for the retention of said stock feed tube.

2. A screw machine embodying a gear housing, a work holding spindle and a cam shaft, a cam on said shaft, a rod mounted in said housing, a slide reciprocatively mounted on said rod, a laterally extending arm on said slide, a stock feed tube connected to said arm and slidably mounted in said work holding spindle, a second rod mounted in said housing, a yoke depending from said slide engaged with said second rod, a ledge on said slide having a T slot therein, a block on said ledge, bolts in said block engaged in said T slot, a roller on said block engaged with said cam, a spring mounted on said housing normally urging said slide towards said cam and means on said cam shaft for adjusting said cam circumferentially about said shaft.

3. Ascrew machine embodying a gear housing, a work holding spindle and a cam shaft, a cam on said shaft, a rod mounted in said housing, a slide reciprocatively mounted on said rod, a laterally extending arm on said slide, a stock feed tube connected to said arm and slidably mounted in said work holding spindle, a second rod mounted in said housing, a yoke depending from said slide engaged with said second rod, for restraining the slide from arcuate movement upon the first named rod, a block on said slide, a roller on said block engaged with said cam, means in said slide for clamping said block thereon, a third rod mounted in said housing, a spring thereon normally urging said slide towards said cam, and an anti-friction bearing secured upon said stock laterally extending arm on said slide.

ALFRED F. JELINEK. WALTER E. GROSS.

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