Patent GB-835718-A (GB)
Title: Improvements in record tape controlled punched card machines
Filed: 1957-04-30
Abstract: 835,718. Verifying record cards. MAUL, M. April 30, 1957 [June 1, 1956; Aug. 23, 1956], No. 13714/57. Class 106 (1). [Also in Groups VIII and XVI] A tape-controlled card punching machine is provided with means for verifying the punched cards. Double-deck cards, Fig. 4, are fed row by row past a row of punches 22 and the punched cards are fed past a row of verifying brushes 26, the row under the brushes corresponding to that under the punches. The cards are fed.stepwise by means of a ratchet-wheel 31, the pawl 32 of which is controlled by a clutch magnet K. A record tape 11, Fig. 3, is sensed be means of brushes 15, 17 movable over contact pieces 18, 19, respectively, the tape section sensed by the brushes 15 controlling the operation of the punches and the tape section sensed by the brushes 17 effecting verifying of the punched cards. Arms 14, 16 carrying the brushes 15, 17 are mounted on shafts 30, 84 which are continuously rotated in opposite directions, the number of revolutions of the shafts in each sensing cycle corresponding to the number of rows to be punched in the card. After a card has been completely punched, the tape is advanced, simultaneously with the advance of another card, by means of a sprocket wheel the teeth of which engage feed holes in the tape, the sprocket wheel being mounted on the shaft 30 and being rotated by means of a friction clutch and a ratchet wheel 39, Fig. 8, the pawl 41 of which is controlled by a clutch magnet S, Fig. 10, associated with contacts v<SP>1</SP>, v<SP>2</SP> and v<SP>3</SP> which are controlled by means of pins 85, 48 and 47 mounted on gears 83, 36 and 46 respectively. The length of tape advanced can be varied by angularly adjusting the gear 83 to vary the time of opening of the contact v<SP>1</SP>. The contactpieces 18, 19 are respectively connected to commutators 50, 64, Fig. 10, included in an electric circuit comprising double grid relay valves T, associated with punch selector magnets 24, and a commutator 58 which selects the column of the card to be punched. When a valve T becomes conducting, the corresponding magnet 24 is energized. The lamillµ of the commutator 58 are connected to contacts 56a, 56b associated with movable contacts 55 which are connected by means of lines 54 to the upper grids of the valves T. The contacts 55 are in their upper position when the upper deck of a card is under the punches and are moved to their lower position when the lower deck of the card is under the punches. The lines 54 are connected through rectifiers 63 to the brushes 26 and through rectifiers 61 to a common line 62. The arm of the commutator 64 is connected by a line 65 to a differential transmitter 66 which is connected to a contact bar 67 common to the brushes 26. The secondary 66a of the transmitter is connected to the grid of a valve 67a which, in the event of disagreement between the tape section sensed by the brushes 17 and the punched cards sensed by the brushes 26, is rendered conducting to cause a relay 68 to respond and indicate the error in known manner, e.g. by stopping the machine. If the data to be punched in the card differs from that in the tape section, a transcoder, Fig. 9 (not shown), is employed. The machine may be provided with an addition, Figs. 11 to 14 (not shown), in cases where a column or columns of the tape section have been punched incorrectly.