US1671901A - Guard for punch presses - Google Patents

Description

May 29,1928. 1,671,901 E. ISCHINGER.

GUARD FOR PUNCH PRESSES Filed May 2, 1924 5 Sheets-Sheet l --llll \HVENTOR May 29, 1928.

Filed May 2, 1924 s Sheets-Sheet 2 INVENTOR May 29, 1928.

E. ISCHINGER GUARD FOR PUNCH PRESSES 3 Sheets-Sheet 5 Filed May 2, 1924 R O T H E v N Patented May 29, 1928.

UNITED STATES PATENT OFFICE.

ERIC ISCHINGER, OF EAST ROCHESTER, NEW YORK, ASSTGNOR OF ONE-HALF 'i'CO FRANK KEIPEP OF ROCHESTER, NEW YORK.

GUARD FOR PUNCH PRESSES.

Application filed May 2, 1924. Serial No. 710,628.

T he object of this invention is to provide a new and improved type of guard for punch presses or similar machines.

Another object of this invention is tovso a construct and operate the guard that it will guard the danger point of the machine immediately after the machine begins to operate. v

These and other objects of this invention P will be fully illustrated in the drawings, de-

scribed in the specification and pointed out in the claims at the end thereof.

In the accompanying drawings: Figure l is a perspective view of a punch press with the guard attached thereto.

Figure 2 is a detail'perspective view of a modified form of the oscillating member of the guard.

Figure 3 is a perspective View of a modilied guard member operated by the guard.

Figure a is a detail perspective View of another modified guard member operated by the guard.

Figure 5 is a perspective View of a: punch press with a modified form of the guard attached thereto.

Figure 6 is a detail perspective view of a modified form of the guard member for the guard illustrated in Figure 4.

Figure 7 is a detail perspective view of the punch press with another modified form of the guard attached thereto.

Figure 8 is detail perspective view of a modified form of the oscillating member of the guard. v V I In the several figures of the drawings like reference numeralsindicate like parts.

The guard for punch presses orother similar machines forming the subject matadapted for use on presses in which the sweeping motion of a pendulum guard in front of the ram of the press is objectionable due to the nature of the work that is to be performed by the press.

As illustrated in the figures of the drawings the arm of the guard instead of swing ingacross in front of the ram of the press swings at one" side thereof, that is, instead of swinging in front of the operator across from one side to the other it swingstoward and away from the operator. For this reason the oscillating member 1 of the guard is mounted to oscillate on a stud 2 that is mounted parallel to thevface of the press and ilk ter of my present invention is especially suitably supported on the frame by the bracket The oscillating member 1 is provided with the sleeves 5 and -6 of which sleeve 6 is threaded to receive the threaded arm 7.

This arm has an eye 8 formed on the end arm 12 is adjustably mounted a bracket 13 in which a horizontal guard member 13 is adjustably carried. This guard member is normally held in place by the guard arm at a point between the bottom of the ram 11 and the bed plate let of the press and slightly behind the punch 15 and die 15 mounted on the press. .On the downward movement of the ram the oscillating member 1 is oscillated as above pointed out and swings the lower. end, ofthe guard arm 12 and with it the guard member 13 outwardly, moving the guard through between the punch and die before the ram. brings the punch and the die together. The operators fingers are thus forced back from the die if they are in place on the die where the punch would pincht-hem or cut them oil when the punch and die are finally brought together. I

In this way the guard member 13* is automatically made to sweep over the die at every strokeofthe ram of the press and brushes the fingers of the; operator away from the top of the die should they acci dentally be in place thereon when the rain of the press begins to descend to bring the punch and die together. U r

The guard member 1'3 illustrated in Figure 1 comprises a fiber or other non-metallic rod having its upper face tapered into a triangular cross section. This serves to de tlect the guard member to either the front or the back should the punch come in contact with the tapered sides of the guard member.- This may happen if the guard is not properly adjusted so that the guard memberdoes not IHQYQ OUt' from under the punch before the punch and die is closed.

In Figures 3 and 4 modifications of the guard member are illustrated. The modification of the guard member comprises a bar having a cross section identical to that of the cross section of the guard member 13 described in connection with Figure 1. Instead of being straight however this guard member is bent into a V with the apex of the V located close to the back of the die over which it is adapted to sweep. This brings part of the guard member in very close proximity to the die that it guards, withoutobstructing free access to the die from either side or the front thereof.

' The modified form. of the guard member illustrated in Figure 4; is notintended to pass over the die. It is made up of the bar 16 carried on the lower end of the guard arm 12 and the auxiliary guard members or feelers 17 and 18 are adjustably mounted on the bar 16 and project forwardly therefrom. The guard is adjusted so that the guard arms swings the bar 16 toward or away from the back of the die without moving over it while the auxiliary guard members or feelers move alongside the die. In front the feelers may be curved and bent to either 'flare inwardly or outwardlly depending on the stock and the operation on the stock that is to be performed by the press.

In the operation of this guard it is desirable to make the guard arm swing at a variable speed. For this purpose the modification of the oscillating member illustrated in Figure 2 may be used. In this modification the threaded arm 7 illustrated in Figure 1 is replaced by the adjustable yoke 20. This yoke has threaded ends that are adapted to pass through a pair of suitable sleeves formed in the oscillating member above and below the bearing of the oscillating member. Suitable locknuts are employed to clamp the ends of the yoke in place on the oscillating member. The yoke thus forms a slotted arm for the oscillating member in which a roller 21 is adapted to slide back and forth. The connecting link 9 is attached to this roller and the guard 13 so adjusted that the yoke in its normal position assumes a position in which the roller 21 is located close to the oscillating member. The downward movement of the connecting link then rocks the oscillating member quickly at the beginning of the stroke of the ram because of the close proximity of the roller to the center of oscillation of the oscillating member. During the oscillation of the oscillating member the roller gradually moves out in the slotted arm formed by the yoke and thus gradually reduces the speed of the guard arm. On the return movement the guard moves slow at first and gradually speeds up until it reaches its starting position. I

provided with the laterally projecting arm or lug 25 while the section 23 is provided with the upwardly projectinglug 26. The action of the coiled spring 2-tholds the end of the lug or arm 25 in contact with the lug 26 so that on the reciprocation of the ram the two sections are operated in unison unless the guard member or guard arm isprevented from swinging as above pointed out. In that case the section 22 which is directly connected to the ram of the press thru the connecting link can oscillate alone because of the yielding connection between the two sections that is formed by the coiled spring 24.

The modification of the guard illustrated in Figure 5 differs from that illustrated'in Figure 1 in the operating connection between the oscillating member end and a movable part of the press. This connection is made between the connecting rod 27 of the press and the oscillating member instead of the ram 11 of the press and the oscillating mem ber as illustrated in Figure 1. A block 28 is clamped to the curved front of the connecting rod by means of the clamping screw 29 which passes thru the middle of the block 28 and is threaded into the connecting rod and forces the V shaped'seatprovided at the back of the block 28 against the face of the connecting rod.

At the left of the block 28 is provided a boss 30 into which the arm 31 is threaded. The bearing sleeve 32 carried on the upper end of the link 33 is adapted to oscillate on the outer end of the arm 31 completing the connection between the adjustable arm of the oscillating member 1 and the connecting rod of the press. The connection between the connecting rod and the oscillating member operates the guard in the same manner as the connection between the oscillating member and the ram of the press illustrated in Figure 1 except that in the connection between the connecting rod and the guard the parts may be adjusted permanently for all work due to the uniformity of the movement and position of the connecting rod while when connecting the ram of the press with the oscillating member, the connection must be adjusted whenever the ram is adjusted by raising it or lowering it on the end of the connecting rod.

In Figure 5 the guard member operated by the guard arm comprises a swinging plate lot 3,5 that is mounted to swing on the base of the die. The swinging plate is therefore provided with a suitable hinge leaf 36 that is fastened to the base of the die. A pin 37 is provided on the plate 35 and projects to the left thereof to engage into the slot38 provided in the end of the guard arm 12. On the operation of the press the swinging of the guard arm operates to swing the swinging plate from a position below the ram of the press to a position on the outside thereof which movnent of course'must be quick enough so that the swinging plate will have passed from under the ram before the ram has descended too far to prevent the swinging of the plate. The plate slotted in the middle so that the punch carried by the ram can descend without obstructing the movement of the swinging plate. The funetion of this guard member is to force back the hand or the fingers of the operator feeding the press as soon as the ram descends. It will of course be understood that the plate may be formed, thatis slotted and bent in any suitable manner to conform to the construction and operation of the die that it is to guard.

In Figure 6 the swinging plate is mounted on the end of the ram of the press and is also made to swing out from under the arm as the ram descends.

In Figure 7 another modified form of the guard member is illustrated. This form of the guard member comprises a swinging gate 40 that swings from one side of the'ram to the front of the ram and is mounted on the vertical pivot stud 41. The pivot stud 41 is anchored on the base of the die. The gate 40 is curved or semicircular in outline and is adapted to encircle the front and sides of the die when it swings into its guarding position. Projecting from the side of the swinging gate is a cam plate 42 having the cam slot 43 provided therein. The lower end of the guard arm engages into this cam slot so that when the guard arm swings outward on the descent of the ram of the press the lower end thereof slides in the cam slot and swings the gate from a position at one side of the die to a position in front of it. This brushes the hand of the operator to one side should it be still in place on the die when the press begins to operate.

From the foregoing it will be seen that while the guard member of the guards illustrated in the figures differ both in design and operation, the actual operating mechanism of the guard remains the same and operates to automatically throw or brush the hands or fingers of the operator away from the die immediately after the ram of the press is released and descends to bring the punch in engagement with the die, and thus prevents serious injury to the fingers or the hand of the operator.

I claim: 7

I. In a. guard for punch presses, the combination of an oscillating member, an operating arm and a guard arm carried by said oscillating member, a yielding connection between said operating arm and said guard arm to allow said guard arm to yield on the oscillation of said operating arm when encountering a resistance greater than that offered by the hand or arm of the operator in. operating the press.

In a guard for punch presses, the combination of an oscillating member, divided into'two sections, a, yielding connecting memberbetween said two sections, an operating arm carried by one of said sections and a guard arm carried by the other of said sec tions, said yielding connection being adapted to allow said. guard arm to yield on the oscillation of said oscillating member when encountering a resistance greater thanv that offered by the hand or arm of the operator inoperating the press.

3. In a guard for punch presses, the combination of an oscillating member, an operating arm and a guard arm carried by said oscillating member, a yielding connection between saiid operating arm and said guard arm to allow said guard arm to yield on the oscillation of said operating arm when encountering a resistance greater than that offered by the hand or arm of the operator in operating the press, means provided on said oscillating member to hold said operating arm and said guard arm in a predetermined initial position.

i. In a guard for punch presses, the combination of an oscillating member comprising two sections, one of said sections carrying an operating arm the other of said sections carrying a guard arm, a torsional member connecting said two sections, means car ried by each of said sections to prevent their independent oscillation in one direction, said torsional member being adapted to yield on the retardation of said guard arm when encountering a resistance greater than that offered by the hand or arm of the operator in operating the press.

5. In a guard for punch presses having a frame and a movable member mounted in said frame, the combination of an oscillating member mounted on the frame, a con necting link connecting said oscillating member with the movable member of the press, a guard arm carried by said oscillating member, a laterally extending guard member attached to said guard arm and held in position in back of the movable member of the press, a forwardly projecting auxiliary guard member carried by said laterally extending guard member, said oscillating member swinging said guard arm toward and away from the frame of the press with said laterally extending guard member moving lUt) lit)

toward and away from the movable member of the press and with said forwardly projecting auxiliary guard member moving on one side of the movable member of the press.

6. In a guard for punch presses having a frame and a reciprocating ram mounted in the frame, the combination of an oscillating member mounted in front of the frame, a connecting link connecting said oscillating member with the ram of the press, a guard arm carried by said oscillating member and located on one side of the reciprocating ram, a pair of forwardly projecting auxiliary guard members carried by said guard arm and adapted to be moved back and forth on each side of the ram on the oscillation of said oscillating member and the movement of said guard arm caused thereby and means for adjusting one of said pair of forwardly projecting auxiliary guard members toward and away from the other of said pair of forwardly projecting auxiliary guard members.

reciprocating ram, a guard arm carried by said oscillating member and located on one side of the reciprocating ram, a laterally extending guard member attached to said guard arm, a forwardly and outwardly projecting auxiliary guard member carried by said laterally extending guard member and means for adjusting said auxiliary guard member to project to the front of the ram of the press, said oscillating member swinging said laterally extending guard member toward and away from the ram of the press and said forwardly and outwardly projecting auxiliary guard member on one side and in front of the ram of the press.

In testimony whereof I my signature ERIC ISCHINGER.

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