GB840114A - High speed punch device - Google Patents

Abstract

840,114. Selective punching machines. SOROBAN ENGINEERING Inc. Feb. 5, 1957 [March 19, 1956], No. 3952/57. Class 31 (2). A device for performing an operation on a record member comprises a reciprocable member, means for reciprocating the reciprocable member including drive means for establishing a cycle of operation such that the reciprocable member is moved with a predetermined function during a first portion of the cycle and remains stationary during a second portion of the cycle, a movable member for performing an operation on a record member, means for selectively connecting the movable member in actuating relationship with the reciprocable member, and means for effecting such connection between the movable and reciprocable members during the second portion of the cycle of operation. As shown in Fig. 1, a record member fed stepwise by means of a sprocket wheel 54 is punched by means of punches 45. A punch bail 35 and a feed bail 69 are connected by means of frequency-doubling toggle linkages 29 to 32 and 67, 68 to shafts 22, 28 which are connected to cam followers 11, 12 reciprocable by means of an elongated triangular constant diameter cam 10 rotatable by a shaft 6 disposed at the centre of curvature of one of the side faces of the cam. The follower 12 is disposed at an angle of 120 degrees to the follower 11. The angular displacement between the cam followers may, however, be 60 degrees or another multiple of 60 degrees. Instead of a single cam and phase-displaced cam followers, two phase-displaced or aligned cams carried on a common shaft or on separate and synchronized shafts may be employed to co-operate respectively with two aligned or phase-displaced cam followers. The punch bail 35 actuates the punches through the intermediary of interposers 73 each having an upwardly extending stair-step portion 76 cooperable with a complementary downwardly extending stair-step portion 39 of the bail 35. A punch 46 for punching feed holes in the record member is reciprocable with the bail 35. The sprocket wheel 54 is rotatable stepwise by means of a pawl and ratchet 57, 58, the pawl 58, which is spring-influenced, being pivotally mounted on a link 59 having one end pivotally mounted on a shaft 56a and the other end pivoted to a feed rod 61 provided with a projection 72 which is operable by the feed bail 69 through an interposer 74. The interposers 73, 74, which are preferably made of nylon, are operatively connected to the pivotally mounted armatures 79 of electromagnets 80 which are energized selectively by electrical means. The armatures are maintained in their inactive positions by permanent magnets 82. The upper end of the feed rod 61 is provided with a slotted aperture 64, Fig. 2, through which extends a pivot 65 which also extends through one end of a drag link 66 the other end of which is pivotally secured to a shaft 38 passing through the upper portion 34 of the punch bail 35. The feed bail 69 is formed as a downward extension of the drag link. The punches 45, which have enlarged head portions 47, are slidable through apertures 44 in the lower portion 40 of the punch bail and extend downwardly into apertures 48 in a plate 49, oil being maintained in the apertures 48 to provide viscous damping of the punches. Punchings are received in a U-shaped trough 53 through which an air blast from a cooling turbine 9 is directed. The punch interposers 73 are re-set by means of a pivotally mounted bail 84 connected by means of links 86, 87, to the centre of the drag link 66. The feed interposer 74 is reset by means of a pivotally mounted bell-crank 70, Fig. 2, one limb 70a of which is pivotally connected to the shaft 38 while the other limb 70b is engageable with a stud 88 provided on the interposer. Instead of a feed interposer 74, a permanent connection between the feed toggle links 68, 67 and the feed rod 61 may be provided to effect feed of the record member during each half cycle of rotation of the shaft 6. The cyclic operation of the punch and feed mechanism is shown in Fig. 5.