Patent GB-527786-A (GB)
Title: Improvements in or relating to cash registers or similar accounting machines
IPC: G06C7/10
Filed: 1939-04-15
Abstract: 527,786. Cash registers. NATIONAL CASH REGISTER CO. April 15, 1939, No. 11531. Convention date, April 16, 1938. [Class 106 (i)] Mechanism co-operating with each denominational element thereof comprises an actuator therefor, a driver for said actuator, a latch normally coupling the actuator to the driver, a two-armed lever, and means, connected to one arm of said lever and controllable by an associated totalizer element when in zero position, for operating the lever to cause the other arm thereof to disengage the latch whereby the actuator can be positioned differentially by the said totalizer element during total-taking. Totalizers and differential mechanism. There are three lines of totalizers 33 on shafts 34 adapted to engage actuators 32 each having three racks 35. The main shaft 40 is given one rotation clockwise for "adding" and two rotations during " total taking." The drivers 52 for the actuators are given an invariable oscillation once in a cycle from cams 41, 42, a shaft 40 through levers 43 and links 50, 51. A shoulder 53 on the driver normally engages a spring latch 55. The amount is set up by depressing keys 30 and after the proper totalizer key is depressed and the machine started the actuators 32 are advanced until the projecting arm 56 of latch 55 is engaged by a key stem and the actuator arrested, the driver continuing its motion, and the latch engaging a notch 57 in the locking bar 58. In banks where no key is depressed the zero stop pawl 59 is engaged by the latch and the actuator arrested in zero position. Depression of a key rocks zero pawl 59 out of the path of arm 56. The totalizers 33 now engage the racks and during restoration of actuators 32 by studs 62 a driver 52 engaging parts 63 on actuators the amount is transferred to the totalizer. Totals and subtotals. The total lever is positioned and ensures that the selected totalizer line is rocked to engage wheels 33 with racks 35 near the end of the first cycle of operation, the pawls 59 being moved out of the path of latch arms 56 until near the end of the second cycle after the actuators are restored. During this cycle, when the racks are restoring the wheels 33 to " zero," the long tooth 73 on a wheel contacts a toe 74 of a three-armed lever 75 pivoted at 36 and rocks it counterclockwise, Fig. 4, an arm 95 of this lever acting through links 103 rocks lever 70 clockwise about its pivot 71 causing the arm 72, the surface of which is curved about centre 36, to engage a roller 78 on latch 55 and to move the latch to engage a notch 57 to arrest the actuator. Each lever 70 is normally held in an ineffective position by hook 82 on a locking arm 80 pivoted at 81 engaging a pin 83 on the arm 79 of lever 70. The arm 95 has a slot 96 into which projects a pin 97 on a link 98 pivoted to a two-armed lever 99 secured to shaft 71. The other arm of the lever 99 carries a stud 101 engaging a cam slot in arm 80 and in the position shown holding the lever 75 out of action. The shaft 71 is rotated clockwise during the first cycle and counterclockwise near the end of the second cycle. The first movement causes the pin 97 to move down into the slot 96 and cam the lever 75 so that the toes 74 lie in the path of the long tooth 73. The lever 99 is also rotated to release the hook 82 from pin 83. On action of shaft 71 the lever 99 restores levers 80 and 75. A bell-crank 128 isrocked first clockwise and then counterclockwise for every complete revolution of shaft 40 by cams 120, 121, a lever 124 pivoted at 125 and a link 127. Pivoted on shaft 36 is a lever 140 having a slot 141 engaged by a pin 142 on an arm 143 fast on shaft 71. An arm of lever 128 has a slot 144 parallel to a slot 145 in an arm of lever 140. When the shaft 151 is rocked, a pin 146 carried by a link 147 is moved through cam slot 152 and pin 153 and lever 148 to couple bell crank 128 and lever 140 so that shaft 71 is rocked. In addition, the shaft 151 is given a further clockwise movement near end of the first cycle through a cam gear driven from the shaft 40 through a coupling actuated by the initial movement of shaft 151 derived from the total lever. Specification 8119/15, [Class 106 (i)], and U.S.A. Specification 1,702,861 are referred to.