Patent GB-710928-A (GB)
Title: Improvements in or relating to record card punching machines
IPC: C12P19/24
Filed: 1952-10-16
Abstract: 710,928. Selective punching machines. MAUL, M. Oct. 16, 1952 [Nov. 17, 1951] No. 25977/52. Class 31 (2) A key-actuated machine for punching code perforations in record cards having a plurality of decks of perforations comprises a set of punches 12 for each deck disposed below the card path, a matrix bar 52 disposed above the card path, a single set of key levers common to all the sets of punches, a single set of punch selector bars 11 constructed as code selector bars, means effective upon actuation of any key lever to condition for operation the selector bar or bars representing in code the character corresponding to the actuated key lever. and means for selectively moving the set of selector bars into co-operation with a desired one of said sets of punches so as to establish an operative connection between the punchoperating means and the selected punches of the selected set. As shown in Fig. 1. for dealing with a card having two decks of perforations. a card carriage 62 is fed in steps from right to .left on the machine bed 48 for the punching operations which are effected under the channel member 55. The punches. 12, Fig. 6, are arranged under the bed in a transverse line, being in two sets corresponding to the two decks of the card, and the set of selector bars 11 is movable transversely of the machine to co-operate with either set of punches. The card carriage 62 is provided with a pivoted and spring-urged clamp 64, Figs. 1 and 2, which grips the card and is automatically rocked to release it by engagement with a fixed cam when the carriage reaches its extreme left-hand position. With the carriage in this position, the rocking of a hand-lever 13 acts through levers to release a locking pawl 78, Fig. 7, from a rack on the underside of the carriage, which is then returned to its operative starting position by a spiral spring. Forward stepped movement of the carriage is then effected by an electromagnet T which, upon energization, acts through its armature 81 to cause a pusher pawl 85 to move the carriage one step until stopped by an abutment 87. Punching occurs after each advance, and upon de-energization of the electromagnet a spring 89 restores the pawl 85 to its original position set by an abutment 91. Each punch 12 is movable in a guide in the machine bed 48 and supporting bar 47, Fig. 6, being urged to withdrawn position by a spring 51. In operation. the punches co-operate with a matrix bar 52 supported above the card, and the superposed channel 55 (which is apertured) prevents the punched waste from falling on to the card. The set of selector bars 11 is supported, on a carriage in the form of two slides 24, 25, Fig. 6, movable on rods 26 so as to bring the bars under either set of punches. This movement of the carriage is effected by levers 19, 23 which are mounted, on a shaft 18 and pinned to the slides, the lever 19 being rocked by either of two stops 20 on a plate 16 which is rotated by the hand-lever 13. The selector bars, which are held on the slides 24, 25, by a spring 29 and guided by pins 27, 28, are associated with an electromagnet W which, when energized, acts through springs 32 to displace endwise on the slides such of the bars as are not then locked against such movement by one of a plurality of locking bars 33 actuated, by the character keys 30. In this displaced position, the ends of. the bars ars positioned over a punching yoke 46 carried by one of the rods 26: the subsequent energization of electromagnets S<1>, S<2> rocks the yoke upwardly to raise the displaced bars and thereby force the corresponding punches 12 through the card. The depression of any of the character keys 30 acts through a lever 34. Figs. 2 and 6. rod 35 and lever 36 to swing the corresponding locking bar 33 upwardly into co-operation with the toothed lower edges of the bars 11 and. at the same time by closing a switch to energize the electromagnet W to displace the unlocked bars 11. The teeth on the selector bars are so arranged that each bar 33, when actuated by a key 30, locks a different set of selector bars and therefore provides a different combination of operative punches. To prevent bending of the locking bars 33 by the energized magnet W. these are engaged by two toothed bars 44 arranged parallel to the bars 11. After the insertion of a card in the carriage at the left-hand of the machine in Fig. 1. the handle 13 is rocked in appropriate direction to position the set of selector bars beneath the selected card deck, and, by releasing the pawl 78, to cause the card carriage to move to starting position an indicator 111. Fig. 1, moved by the slide 25 shows through a slot which deck of the card has been chosen. Depression of a key 30 then operates the corresponding locking bar 33 and by closing a switch. Fig. 10. (not shown) energizes both the electromagnet W to displace the free selector bars and the electromagnet T to cause the pawl 85 to move the card carriage one step. The armature of the electromagnet T then actuates contacts whereby feed current to the magnet is through a protective resistance and the punching magnets S', S<2> are energized; the armature of the magnet S<2> also opens a switch so that the feed current to the magnets S<1> S<2>. W is through a protective resistance. When after repeated actuations of the keys 30, one deck of the card has been punched, the handle 13 is rocked to position the selector bars and card carriage for the other deck. Depression of a skip key acts through levers to actuate a contact and interrupt the circuit, through the magnets S<1>, S<2>, W and energize the magnet T to step the carriage to the left in Fig. 1. Depression of a release key is effective to provide an automatic interrupting circuit which alternately energizes and de-energizes the magnet T until either the key is released or the card carriage reaches the insertion position where it opens a contact to interrupt the whole circuit. A back-space key, when depressed, acts through levers to actuate the locking and pusher pawls 78, 85, of the card carriage feed; actuation of the key moves the carriage backward a halfstep and its release reverses the position of the pawls and completes a full-step movement of the carriage.