Patent GB-250258-A (GB)
Title: Improvements in or relating to means for producing punched records for use in calculating apparatus
IPC: G06C11/08
Filed: 1926-04-01
Abstract: 250,258. British Tabulating Machine Co., Ltd., (Assignees of Watson, T. J.). April 4, 1925, [Convention date]. Adding-machines; statistical machines; cash registers.-Relates to a machine in combination with a card punching device wherein a perforated record is produced in accordance with the amount set up on the keys and consists in the provision of differentially controlled contacts and electric circuits adapted successively to select and effect punching of the record card in denominational columns during an operation of the machine. As shown applied to a Burroughs adding machine, Fig. 1, each of the differential actuating racks 21 is associated with a corresponding member 42 pivoted on the shaft 23 and connected to its actuating rack by a pin 46 and spring 47. The member 42 has an arcuate part 43 with teeth 44 for engagement by a pawl 51 to hold the member in set position during the return of the actuating racks and an extension 57 of the part 43 carries a bifurcated contact 58 co-operating with an insulated contact strip 62 and set of ten contacts 63. The pawl 51 is normally held disengaged by a spring-controlled bail 54 pivoted on the shaft 50 and attached to a link 41 connected at its lower end to a pin 40 on an arm 39 pivoted on a shaft 31. The pin 40 bears against an arm 35 secured to the shaft 31 and the bail is removed from the pawl when the shaft is rotated by an arm 30 thereon connected by a link 28 to a member 26 secured to the shaft 25 carrying the main operating handle. Connection with the main operating shaft 33 of the adding machine is effected through a resilient connection or coil spring 34 and member 32 to prevent shock to the actuating parts. The arm 35 is provided with a toothed sector 36 gearing with a pinion 37 on a shaft 38 on which is loosely mounted a commutator drum 65, Figs. 6 and 7, having a conducting strip 91 and conducting blocks 92, 93 &c., co-operating with a set of brushes 81, 82 &c. in circuit with the operating magnet of a punching machine of well known type and the contact banks 62 of the different denominations respectively. Each contact 63 is connected in circuit with a selecting magnet 106 adapted to operate the corresponding digital key of the punching mechanism. To the commutator shaft is secured a disc 70 carrying a pawl 71 for engaging a notch in a ring 67 attached to the commutator; a pawl prevents movement of the commutator in an anticlockwise direction. The shaft 38, which receives a revolution in this direction on the forward stroke of the operating handle, rotates the commutator for one revolution on the return stroke of the the handle causing the energization of the electromagnet 106 whereby the plunger 108 is depressed rocking the bell crank 109 so as to position the corresponding interceptor bar 110 into the path of the bail 116 and at the same time causing the movement of a link to close contacts 113 in the circuit of the operating magnet 114 the armature of which effects the movement of the bail 116 to depress, through the bar 110, the plunger 105 to effect the perforation of the record card. In the punching device shown the cards 100 are stacked in a magazine 101, Fig. 3 and the lowermost card is fed to the perforating position by a spring-controlled pull rod 102. During this movement a pin on the rod 102 opens contacts 121 to cut out the selecting magnets 106. The circuit of the selecting magnets is also opened after each punching operation by a bracket 120 on the bail 116 opening contacts 119 shown in the wiring diagram, Fig. 9, thus permitting the interceptor bar to return to inoperative position. The invention is shown in Figs. 11 and 16, applied to a key-set and operated cash register; depression of a key lever raises an upright member 221 to position a differential actuating segment 224 in the usual manner and through a slotted link 238 pivoted thereto displaces a sector 242 to a corresponding extent to position the bifurcated contacts 247 with respect to the contact bank 248, 249. The sector 242 is retained in position, until the end of the return movement of the slotted link 238, by means of a pawl 255 adapted to be disengaged finally by a projection 240 on the said link. Three banks of contacts are provided one for the dollars, dimes and cents respectively and each is in circuit with a brush 262, 264 of a commutator 256 similar to that described above but operated by the well-known rack and pinion 230, 231, Fig. 16, from the usual key coupler 228. The punching mechanism is identical to that described above, and the perforating of the record card is effected successively in the dollars &c. columns. The adding machine or cash register may be used without producing a perforated record by providing a switch 122 in the circuit.