Patent GB-982721-A (GB)
Title: Adding machine
Inventor: PLAUT MICHAEL
IPC: G06C7/08
Filed: 1962-01-04
Abstract: 982, 721. Ten-key adding machines; transfer mechanisms. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Jan. 4, 1962, No. 350/62. Headings G4B and G4D. A ten-key, pin carriage adding machine has differential actuators 3 (Fig. 1) each carrying a type bar 9, engaging one or the other of a pair of totalizer wheels 22, 23 depending on the operation to be performed, and carrying a tens transfer member 21 which is associated with a transfer storage member 17. The pin carriage 33 (Fig. 11) is located by abutment of an upstanding 9-representing pin with a lug on the underside of the keyboard. A bail (Fig. 5, not shown) depresses the 9-representing pin when any other key is operated. The carriage is returned to the right after a number has been entered by rotation of arm 77 derived from movement of the main shaft through hook 76, slide 74 and stud 77a. During multiplication by repeated addition arm 80 swings hook 76 clear of the main shaft to allow free repeated movement of the actuators. While returning, a ramp 79 resets the pins. Pins are located in raised or depressed positions by a spring or springs which engage notches in the pins (Fig. 4; not shown). Each actuator 3 carries a member 13 on which is a lug 13a which abuts a depressed pin 32 and limits the movement of the actuator when released to spring 15 by universal bar 14. Between actuator 3 and member 13 is relative sliding movement equal to one tooth pitch of rack 8. With an actuator is associated transfer storage member 17 which can take either a lowered position as shown or a raised position in which a recess 17<SP>11</SP> is in register with a projection 21 on a T-shaped member mounted on the next-lower order actuator and a notch 17a is engaging the edge of a guiding slot in plate 18. The totalizers are supported in a cradle (Fig. 6) swinging about an axis 26 and guided in slots 28 in the frame sideplates. The cradle is located by a hook 60 operated by cam follower 61 and an arm 63 slidably engaging the hook 60 in slot 60a and secur - ed to a frame plate at 63<SP>1</SP>. Lever 63 follows a control cam (not shown or described) set according to the operation to be performed. In addition, hook 60 engages stud 56 so that adding wheels 22 are brought into engagement with the actuators on their return movement. In subtraction, hook 60 engages stud 57 so that the subtracting wheels 23 engage the actuators on their return movement. In a sub - total operation stud 59 is acted on by other control means (not described) so that the adding wheels 22 engage the actuators in their forward stroke. Simultaneously bail 19 (Fig. 1) bears on members 17 to hold them in their lowered position. Tooth 17c acts as a stop for a double thickness tooth 24 on an adding wheel and the register is zeroized. Lever 63 is so set that hook 60 does not engage any stud on the cradle and the adding wheels are not disengaged from the actuators on the return stroke. In a total operation, stud 59 is acted on as for subtotalling but hook 60 is caused to engage stud 58 so that before the return stroke the adding wheels are swung clear of the actuators. Printing zeroes. A zero type is supported on a member 10 slidable relative to the actuator and acted on by a lever 11 having a cam surface 11a. As an actuator moves lever 11 is swung anticlockwise and with it through pin and lug connections all levers associated with lower order actuators. If of these lower order actuators, any do not move, i.e. a zero has been entered for that order, cam surface 11a will engage member 10 and cause a zero to be printed. Transfer mechanism. Each add or subtract totalizer wheel has a double thickness; tooth 24 which cams the storage member 17 upwards by its action on tooth 17b or 17c. Member 17 is maintained in the raised position by the engagement of notch 17a<SP>1</SP> with the edge of the guiding slot in plate 18. The return stroke of universal bar 14 causes those actuators of which the associated transfer member 17 is raised to move one further tooth pitch due to the meshing of member 21 with notch 17<SP>11</SP>. For other actuators the movement of the bar 14 is taken up by relatively slidable member 13. Specification 982,722 is referred to.