US1444650A - Punch press - Google Patents

Description

Feb. 6, 1923.

W. G. ALLEN PUNCH PRESS Filed Ma 19, 1921 7 sheets-sheet 1 I N V EN TOR.

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Feb. 6, 1923.

W. G. ALLEN PUNCH PRESS 7 sheets-sheet 2 Filed May 19, 1921 H l lH l III.

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W. G. ALLEN Feb. 6, 1923.

PUNCH PRESS Filed May 19, 1921 '7 sheets-sheet 4 INVENTOR. W 4750/4424, B Y /1 y fla .1 TTORNEY.

Feb. 6, 1923.

W. G. ALLEN PUNCH PRESS Filed May 19, 1921 {I 0 I I 0 GII" '7 sheets-sheet 5 FIG. 7

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Feb. 6, 1923.

W. G. ALLEN PUNCH PRES s 7 sheets-sheet 6 INVENTOR. awe,

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Feb. 6, 1923.

W. G. ALLEN PUNCH PRESS Filed May 19, 1921 7 sheets-sheet '7 FIG, /0

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Patented Feb. 6,

[TED

WILLIAM G. ALLEN, F HARTFORD, COL NNECTIGUT.

PUNCH PRESS.

- Application filed May 19,

To all whom it may con-067m:

Be it known that I, WVILLIAM G. ALLEN, a citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented a new and useful Improvement in Punch Presses, of which the following is a specification.

This invention relates to those presses Y which are designed for punching and drawing or otherwise blanking and dieing sheet metal and other sheet material, of the class in which the driving mechanism is arranged on the frame below the punch and die or other too'ls. Machines of this class are illustrated in U. S. Patents to Wright N o.

1,270.913, July 2, 1918, and Smith 'NO. 1,338,335, April 7, 1920. In the old types of these machines the power of the driving crank that has its side thrusts as well as its vertical pull and push, is applied to a lower gate which slides up and down the frame near the base and which is connected byrods with an uppercrosshead that carries the punch or movable die. The punch-heads of these machines are subjected to vertical strains only but are not supported with sufficient rigidity to perform delicate work accurately, particularly after some use and the guiding parts become worn by the heavy work to which they are subjected.

The object of this invention is to construct a machine of this class which is cheap to build, rugged and powerful in use yet relatively light in weight and which will perform accurate work for a long period, and such wear as results can be readily taken up when necessary.

Machines. which embody the pr ent invention are constructed with driving mechanisms located in the frame below the tools and connected with gates that reciprocate 1921. Serial 1 \To. 470,799.

elevation of the same press with a portion of the frame broken way. Fig. 3 is a view looking at the top of the press with the driving pulley omitted. Fig. at is a horizontal section looking down on the plane in-v dicated by the dotted line 44: on Fig. 1. Fig. 5 illustrates a modifijed ,manner of forming the supporting frame so that the action will be inclined rather than strictly vertical. Fig.6 is a detail of the means employed for fastening the frame sections of the modified construction. Fig. 7 shows a front elevation of a single acting press which embodies the invention. Fig. 8 shows aside elevation of the single acting press. Fig. 9 is a plan of the single acting press. Fig. 10 is a section on the plane 10'10 on Fig. 7.

The frame of the press illustrated is a casting having two side members 1 that are connected at the back by a web 2, at thebottom by a base 3, and a little above the middle by a cross bracket 4 which forms the bed upon which the die 5 is placed. The frame however may be made in parts if desired. The driving shaft 6 which is supported by suitable bearings near the middle of the frame has a pulley 7 and a clutch 8 of common form that is arranged to connect and disconnect the pulley with the shaft by the movement of the treadle 9. At the center the shaft has a crank 10 and on each side of the crank is a cam 11. Embracing each cam is a yoke 12 that has a roller 13 above and a roller -14 below resting against the cam. These yokes are adjustably connected by threaded links 15 with a vertically movable gate 16.

in adjustable ways near the base of the frame, and the lower gates arejconnected" The invention is primarily illustrated as i applied to a double'acting punching and drawing press and Fig. 1 shows a front elevation of such a press. Fig. 2 shows a side The edges of this gate have V-shaped grooves which are fitted to. slide up and down upon V-shaped guiding tongues 17 and 1'8 which are. secured to the inside of the walls of the frame. The guide 18 onone side is permanently secured in place while the guide 17 on the other side is adapted to be adjustedtoward the gate by screws 19. p v

At the top of the "frame is a vertically movable gate 20 which has V-sha'ped grooves in its edges that fit V-shaped guiding tongues 21 and 22 fastened to the inside of the frame, the guide '22 beingpermanently secured and the guide 21 being adjustably secured by screws 23. The upper gate 20 and the lower gate 16 are joined by rods 24 and 25, one being in front on one side, and the other being in back on the other side.

These rods pass freely through holes in the bed bracket and holes. in the gates that are somewhat-larger in diameter-than the diameter of the rods so that the parts may be adjusted and secured .by nuts 26 above and nuts 27 below, without any friction between the rods and the bracket, or putting any side strain on the guidesshould the holes be out of line. This eliminates the necessity of exercising great care and accuracy in the manufacture of parts. Secured to the under side of the gate 20 is a blanking punch 28 which is reciprocated toward and from thedie .5 by the up and down'movement of the gates that is imparted by the cams on the driving shaft, which cams may be shaped to bring down the punch and hold the metal while it is being drawn.

The crank 10 on the driving shaft is con-- nected by a pitman 29 with the gate 30 that slides up and down near the base of the frame. The edges of this gate have V- shaped grooves thatfit theV-shaped tongue 18 on one side and the V-shaped tongue, 31

, on the other side, the latter being adjustably securedto the inside of the frame. Fastened to the gate 30 are two vertical rods 32 and 33, one being in front on one -side and the other in'back on the other side.

These rods extend'upwardly freely through holes in the gate 16, in thebed bracket 4 ing punch is a drawing punch 37. The

and in the gate 20, which holes are larger in diameter than the diameter. of the rods so the rods will .offer no frictional resistance. 'At the top the rods are connected by a crosshead 34. Projecting downward from the crosshead into and guided by an opening through the gate 20 is a ram 36. The crosshead is located in position with the ram in the upper gate and then the rods 32 and 33 are secured by the nuts 35, the holes in the head being larger than the rods so the rods may adjust themselves to the.

head without putting any strain on the parts. Extending down from the lower end ofthe ram through an opening in the blankrotatory movement of the crank is transmitted through the pitman to the lowest gate, the reciprocation of, which through the rods, crosshead and ram'reciprocates the drawing punch.

In the machine described the frame is formed in a single casting. If it is desired to have the frame tilt, as is frequently the case, the bed may be made in sections so that the upper section may be turned on the lower section. With this arrangement the upper edge of the walls of the base section 38 may be provided with internal flanges 39 that are curved on the arc of a circle, the center of which is coincident with the axis of the crankshaft and on the sides of the upper section 40 of the frame are curved tion, as illustrated in Figs. .5 and 6.

If it is desired to provide a knock out for removing a piece from the die, a cam 43 may be secured to the end of the crank shaft 6 which cam may engage a lever 44 on the shaft 45 provided with a rocker arm 46. The rocker. arm is designed to push up against the-end of a spring retracted plunger 47 that extends up through an opening in the bed and die, as shown in Fig. 5.

If it is desired to embody the invention in a single acting machine, that is, a press designed to merely punch or blank sheet metal or other material, the drawing punch or ram, its gate, and the connections with thedriving shaft, may be omitted. Such a single acting press-is illustrated in Figs.

sides .of the frame below the crank shaft.

In this case the lower gate is connected with the upper gate 56, by all four rods 57 the upper gate being movable up and down on guide ways 58 and 59 on the sides of the frame over the die bed 60 which is located above the crank shaft. These rodspassfreely through holes in the die bed and holes in the gates which are larger indiameter. than the diameters of the rods so that the gates may be accurately adjusted and then the rods secured by the nuts 61 without putting any side strains on the gates or adding to the load. I

In machines constructed as herein described the upper tool carrying gate and the crosshead are entirely relieved of all strains except the direct line pull of the rods' which are so mounted that they are not sub,- jected to any frictional resistance. With the driving mechanism set below the tools and the upper gates held in this manner great accuracy can be attained with powerful machines for the tool carrying, parts are supported in such manner that they are not subjected'to distortion or vibration. In the double acting machine the crosshead is guided solely by the fit of the punch carrying rain in the upper igate, and it is subjected to no distortiona strains by the connecting rods.

The invention claimed is: 1. A press comprising a frame, a, die bed on the frame, a driving shaft supported by the frame below the die bed, a reciprocatory gate movable on guide-ways on the frame below the driving shaft. an. actuating con-v nection between said gate and the driving shaft, a reciprocatory gate movable on guideways on the frame above the die bed, a punch carried by said upper gate, rods connecting the lower gate. and the upper gate, said rods passing freely through openings in the frame and in the gates, and means for securing the rods to the gates after the gates. have been located whereby there will be no frictional resistance to the ,movement of the rods and the rods will not transmit any transverse strains on the gates.

2. A press comprising a frame and die bed fixed on the frame below the top thereof, a driving shaft supported by the frame below the die bed, a reciprocatory gate movable on guide-ways on the frame below the driving shaft, an actuating connection between said gate and the driving shaft, a reciprocatory gate mounted on guide-ways on the frame above the die bed, a punch carried by said upper gate, rods connecting the lower gate and the upper gate, said rods passing through openings in the frame adjacent to the fixed die bed but unsupported by the frame, and means securing the rods to the gates.

3. A press comprising a frame, a, die bed fixed on the framebelow the top thereof, a die on the die bed, a knock out movable through said die, a driving shaft supported by the frame below the die bed, means on the driving shaft for actuating said knock out, a reciprocatory gate movable on guideways on the frame below the driving shaft, an actuating connection between said gate and the driving shaft, a reciprocatory gate movable on guide-ways on the frame above the fixed die bed, a punch carried by said upper gate, rods connecting the lower gate and the upper gate, said rods passing through openings in the frame adjacent to the fixed die bedbut unsupported by the frame, and means securing the rods to the gates. Y

4. A press comprising a frame formed in sections, the upper section being supported on the lower section in such manner that it may be inclined with relation thereto, means for securing the upper 'section of the frame to the lower section with the upper section tilted at an angle therewith, a die bed on the upper section of the frame, a driving shaft supported by the upper section of the frame below the die bed, the axis of the shaft and center of oscillation of the upper section of the frame being coincident, a reciprocatory gate movable on guide-ways on the tilted section of the frame below the driving shaft, and actuating connection between said gate and the driving shaft, a reciprocatory gate mounted on guide-ways on the upper frame above the die bed, rods connecting the lower gateand the upper gates.

5. A press comprising a frame, a die bed on the frame,'a'die mounted on the die bed,

a driving shaft supported by the frame below the die bed, a reciprocatory gate niov able on guide-Ways on the frame below the driving shaft, an actuating connection between said gate and the driving shaft, a reciprocatory gate movable on guide-ways on the frame above the die bed, a punch carried by said upper gate, rods connecting the lower gate and the upper gate, said rods being unsupported by the frame, means securing the rods to the gates, a reciprocatory gate movable on ways on the frame below the first mentioned gate, an actuating connection between the driving shaft and said last mentioned gate, a crosshead above the said gate, a reciprocatory gate movable on the guide-ways on the frame above the die bed, a punch carried by said upper gate,

rods connecting the lower gate and the upper gate, said rods being unsupported by the frame, means securing the rods to the gates, a reciprocatory gate movable on guideways on the frame below the first mentioned gate, an actuating connection between said crank and the last mentioned gate, a crosshead above the second mentioned gate, rode connecting the lowest gate with said crosshead, and a punch ram extending from the' guided by the upper crosshead through and gate.

7. A press comprising a frame and die bed fixed on the frame below the top thereof, a die mounted on the die bed, a reciprocatory gate movable on and guided by the frame below the die bed, a reciprocatory gate movable on and guided by the frame above the die bed, a punch carried by said upper gate, rods connecting the lower gate and the upper gate, said rods passing freely through openings in the frame and in the gates, which openings are considerably larger in diameter'than the diameters of the rods, and meansfor securing the rods to the gates after the. gates have been located.

8; A press comprising a frame and die bed fixed on the frame below the top thereof, a, die mounted on the die bed, a reciprocatory gate movable on and guided by the frame below the die bed, a reciprocatory gate movable on and guided by the frame above the die bed, a punch carried by said upper gate; rods: connecting the lower'gate and ,the upper gate, said rods passing through holes in the gates that are considerably larger in diameter than they diameters of 'the rods, and means for securing the rods to the gates 'after the gates 10 have been located. p

9. A press comprising a frame with a fixed, die bed intermediate theends of the frame, a crank shaft supported by the frame below the die bed, a gate movable up and down and guided by the frame below the die bed, a gate movable up and down and guided by the frame above the die bed, rods connecting the upper and lower gates, and operative connections between the crank shaft and the lower gate.

WILLIAM Gr. ALLEN.

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