US2528374A

US2528374A - Strip feeding device

Info

Publication number: US2528374A
Application number: US30105A
Authority: US
Inventors: Kryeske Raymond
Original assignee: Individual
Current assignee: Individual
Priority date: 1948-05-29
Filing date: 1948-05-29
Publication date: 1950-10-31
Anticipated expiration: 1967-10-31

Description

Oct. 31, 1950 R. KRYESKE 2,528,374

I STRIP FEEDING DEVICE Filed May 29, 1948 2 Shgets-Sheet 1 INVENTOR. RAYMOND KRYEsKE Oct. 31, 1950 R. KRYESKE STRIP FEEDING DEVICE 2 Sheets-Sheet 2 Filed May 29, 1948 INVENTOR.

RHYMON 0' KRYESKE ,assembly [1, l8, I9, 20 and 2|.

pivot relation at 16 through universal joint [3,.

Patented Oct. 31, 1950 UNITED STATES PATENT OFFICE STRIP FEEDINQVDEVICE Raymond Kryeske, Union, N. J. Application May 29, 1948, Serial No. 30,105

This invention relates to a feeding device for feeding strip material into punch presses and other strip and coil stock fabricating machines. More specifically, it deals with a feeder synchronously driven by the press and capable of gripping the strip on both sides.

As far as is known, punch presses employing strip stock are fed by hand. This not only requires experienced and skilled operators, but it also involves laborious manipulation which often causes serious accidents, such as loss of fingers or hands caught in the press tools.

One purpose of the present invention is to provide an. automatically controlled feeding device which will enable a press to employ strip stock by reference to the drawings in which Figure 1 is a side elevation of the slide feed or carriage mechanism as adapted to a punch press. Figure 2 shows an end view of the carriage mechanism shown in Figure 1, while Figure 3 is a plan view of the same carriage mechanism. An enlarged plan view of the carriage is depicted in Figure 4, while Figure presents an elevation view of the carriage. An end view of the carriage (with base, lever and stock guides appearing in section) is shown in Figure 6. Figure '7 illustrates an enlarged side elevation of the slip clutch, while an end view thereof, partly in cross-section, is shown in Figure 8. Similar numerals refer to similar parts in the various figures.

Referring again to the drawings, and particularly to Figures 1, 2 and 3, numeral 5 represents a base mounted on bolster plate 2 of the power press (not shown). On base 5 are mounted positive hold-down bracket 44, carriage 38, slip clutch mechanismlll, stock guides 4|, 42' and 43, and adjustable stock guide plate 32. Power. for operating the carriage is taken from'crankshaft 59 of the power punch press by way of a slideactuating crank disk 28. I

For varying the active'stroke of carriage 38,

crank pin 23 (a threaded T-bolt) has a fine adjustable mounting (T-slot) 63 in crank disk' 28. Connected with this adjustable crank pin (through universal joint 25) is adjustable link Connected, in

5 Claims. (Cl. 2712.5)

is rocker lever I2 which is pivoted at its lower end on base 5 at B4.

double taper I60.

Carriage 38 moves in the forward or active direction as shown by the arrow in Figure 1. Wedge I00 of slide 69 spreads apart levers 39 and igrip stock 14. Any further forward motion of 40, thereby causing stock grippers H and 12 to carriage 38 carries the stock 14 until button 4 of "carriage 38 engages adjustable screw 3 locked in place by nut 60. As button 4 of carriage 38 comes'in contact with adjustable screw 3, positive holddown 4! grips stocks 14 by means of lever 5! pivoted by shouldered screw 53 held in bracket 52. Lever 51 is provided with cam follower 56 at one end. Cam 58, through follower 56, causes adjustable set screw 54, locked by nut v 55, to force rod 5! through quick release eccentric pin 48, forcing positive hold-down plunger 41 against stock 14, which continues to function until button 8 of carriage 38 contacts adjustable screw 9 held'in place by nut l I, at which instant cam 58 allows hold-down plunger 41 to release stock 14 through roll 56 to perform the hold down function. I Movement of slide 69 (Figures 4-6) in relation 'to carriage 3B is controlledby adjustable screw 61 held in adjustment by nut 66 and the strip stock 14. Adjustable screw 61 butts against pin 65. When a quick release is desired of the stock gripped by gripper jaws H and 12, pin is pulled out laterally all the way, thereby allowing carriage 38 to be moved forward, resulting in release of stock 14 by gripper jaws H and 12, making the. stock free for further movement.

Should removal of stock 14 be desirable at the time positivehold-down 41 (Figures 1-2) is gripping stock 14, quick release lever 49 which is attached to eccentric pin 48 and carries'detent 6| attached to knob 50, is released by pulling knob 50. This releases detent 6| from positive hold-down 41 and by rotating lever 49 approximately allows spring 46 to bring positive end of its forward stroke so that slide 69 may start back, thereby allowing

levers

39 and 40 to loosen and release gripping jaws H and 12 from stock 14. The braking effect is obtained at the end of the back stroke of carriage 38, causing the carriage to be held momentarily to allow moving forward of slide 59, causing grippers II and 12 to grip stock 14 at the proper instant at the commencement of the feed stroke. As a result, the stock is immediately released at the end of the forward stroke and is positively and firmly gripped at the proper moment (in synchronism with the press) on the commencement of the feed stroke,

thus insuring consistent, accurate feeding of stock M. I

Stock guides M, 42 and 43 guide stock 74 through the feeding mechanism. Stock guide strips ll and 62 are adjustable for different widths of stock. Span 9'! (Figure 6) for the thickness of the stock is preferably less than 1.5 times the thickness of stock l4.

Stock guide plate 32 (Figure 1) is keyed to ride in T-slot l8! and has T-nuts. 33 so that:

shoulder 98 may be easily positioned and act as a guide when pieces of stock are fed into the feed mechanism.

The slip clutch roll feed stop check (shown in Figures 7-8) is actuated by drawing power from crankshaft 59 of the power press, using a V-belt 3! making a 90 V-belt drive. Sheave 88 rotates on lower roll 85 and drives roll 85 through friction discs 9! and 93. Plate 94 has a lateral movement on hub 98 and adjustable pressure is applied to friction disc 9| and 93 through spring cap 95 and nut 96. Roll 85 is keyed to gear 83 by key 82, said gear driving gear 19 which through Oldham coupling 80 and 8| drives shaft 85 mounted in bearings carried in blocks 81. The

shaft 36 and bearings may be raised or lowered to allow for different thickness of stock M and are easily adjustable by means of stop nut 34 and screw 91.

The slip clutch mechanism shown at the right of Figure 8 is able to allow picking up a piece of stock and moving it quickly up against the previous piece of stock 14 as it is being fed by carriage 38. When the second piece 14 butts against the first piece, sheave 88 continues to rotate but rolls 85 and 86, which are driven by friction plates SI and 93, remain stationary.

time, one behind the other, and carriage 38 is moving in the backward stroke, the first piece of stock M is held down by the positive hold-down 41 while the second piece 14', which butts up against the end of the first piece, is held from 4 moving back with carriage 38 by the one-way clutch 15,16 and ll.

The term active stroke employedhereinmeans the complete stroke of the rocker lever, while the term feed stroke means only the stroke made by carriage 38.

From the foregoing, it is apparent that the present invention provides a simple and efficient means for feeding strip stock without incurring the wastage encountered with conventional devices. Also, the gripping mechanism requires no need for jaw adjustment and has less opportunity to get out of order.

Although a one-way clutch (Fig. '7) has been described as the restraining means for shaft 85 to insure forward propulsion of the strip, other restraining means may be used, such as a ratchet device or a brake, or similar mechanism, although the one-way clutch is preferred.

I claim:

1. In a strip feeding device of high accuracy which is synchronously driven in forward and return strokes by said machine acting as the moving force, and employing a base, a carriage reciprocating on said base with adjustable braking action, which carriage intermittently feeds the strip into said machine, and a positive holddown for holding the strip on the return stroke of the carriage, the improvement comprising a small slide to which the moving force is firmly applied, said slide fitting in parallel, limited floating relation in said carriage and moving said carriage indirectly, gripping means attached to said carriage and acting as a moving means therefor, actuating means attached to said small slide for actuating said gripping means, linearly displaceable adjusting means on said carriage for adjusting the floating travel of said small slide to accommodate for small variations in thickarately pivoted gripping member on each side of said stock oppositely disposed to each other forwardly of said pivots and a levering member attached to said gripping member, and said actuating means comprising a separately disposed lever-actuating member attached to and moved by said small slide and disposed therein to impose a leverage force upon said leverage means during the duration of the forward stroke, whereby the gripping force increases when the resistance of said stock to forward motion increases.

2. In a strip feeding device synchronously driven by the machine to which the strip is fed and employing a base, a carriage reciprocating on said base with braking action, which intermittently feeds the strip into the machine and a positive hold-down for holding the strip on the return stroke of the carriage, the improvement comprising two superimposed and reversibly disposed gripping dogs between which the strips pass and by means of which said strips are gripped on both sides as they are moved forward, a shaft projecting laterally from the center of each dog and mounted in the carriage, a lever arm attached to the end of each shaft and acting as means for opening and closing said dog, a tapered wedge disposed equidistantly between the ends of said levers and carried in a small slide mounted in the carriage, said wedge acting to close the dogs to grip the strip stock while the small slide is moving forward and release said dogs on the reverse stroke, said small slide being capable of moving to a limited ex- 5 tent in parallel relation to the carriage, the forward movement of said small slide being determined by the thickness of said strip Stock, the backward movement, thereof being determined by an adjustable means mounted on said carriage, reciprocating means for reciprocating said small slide within said carriage, and engaging means on said small slide for engaging the reciprocating means thereto.

3. A feeding device according to claim 2 in which there is mounted on the base in back of the carriage a set of gear driven, oppositely rotated, superimposed, adjustably spaced shafts, the axes of which are at right angles to the strip and which propel the new strip forward, a slip clutch mounted on the lower shaft, a pulley providing power to said slip clutch from said machine, and retaining means mounted on said lower shaft allowing rotation of said shaft only in the feeding direction of the strip.v

4. A feeding device according to. claim 3' in which said restraining means comprises a oneway clutch.

5. A feeding device according to claim 2 in which the carriage has mounted therein an adjustable set screw in parallel relation thereto and a moveable pin mounted in the small slide, butting up against said set screw when the carriage is being moved on its backward stroke, the moving of which pin allows additional clearance between the set screw and the small slide, thereby causing, through further movement .of the carriage, separation of the dogs to facilitate strip removal.

RAYMOND KR-YESKE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 172,715 Dickinson Jan. 25, 1876 562,222 Granger June 16, 1896 799,321 Gardner Sept. 12, 1905 1,291,482 Greenstreet Jan. 14, 1919 1,447,490 Shellenberger Mar.,6, 1923 1,826,498 Bignell Oct. 6, 1931 2,096,073 Spencer Oct. 19, 1937 2,115,131 Yancey Apr. 26, 1938 2,250,530 Hafecost July 29, 1941 2,380,320 La France July 10, 1945