Patent GB-734159-A (GB)
Abstract: 734,159. Calculating-apparatus; transfer mechanism; zeroizing-mechanism. ARVA SOC. ANON. Aug. 25, 1953 [Oct. 7, 1952], No. 23394/53. Class 106 (1). In a single-bank, key-set calculating-machine having a laterally-movable device for registering an amount set, transfer mechanisms for the totalizer and a revolution counter each comprise laterally-movable helically-arranged teeth on a rotatable member and members displaced at transfer into the path of corresponding ones of the teeth so that on rotation of the rotatable member these teeth are laterally displaced and actuate the totalizer wheels of next higher orders. On actuation of the number keys, toothed segments are differentially set in turn as described in Specification 734,158. The segments are mounted in a small carriage laterally-movable within a large carriage traversable under the control of keys. In each machine operation the segments are moved bodily into engagement with either of two sets of pinions 17, 21, Fig. 10, and rotated to actuate the totalizer, their relative positions being maintained. The pinions 17 mesh with pinions 15 fast with totalizer wheels 6 and are engaged for addition. The pinions 21, which are engaged for subtraction, are geared through pinions 19 to pinions 16 fast with, the totalizer wheels 6. The totalizer and its driving pinions are mounted in a frame 13, Fig. 3, displaceable laterally by depression of appropriate control keys, Fig. 13 (not shown), into three positions for addition, subtraction and zeroizing respectively. The revolution counter has similar driving pinions and is similarly movable to three positions, its setting to the addition and zeroizing positions 'being effected by control keys. In a division operation, after the totalizer has passed through zero, an addition cycle is performed and one is subtracted from the revolution counter which is automatically shifted to the subtraction position for this purpose in a known manner not described. Transfer mechanism. At transfer, a cam 36 on the intermediate wheel 19, Figs. 3 and 4, rocks a lever 10 which is held in its operated position by a detent 28. The forked end 30 of the lever which embraces the driving pinions 17, 21 is thus depressed and one or the other of two cam surfaces. 85 formed on the prongs is moved into the path of a corresponding tooth 39 according to whether the totalizer is in the addition or subtraction position. The teeth 39 are helically arranged in a tube 37 which is rotated to effect transfers and each is mounted in the tube for lateral movement against the action of a spring. Such movement takes place on engagement with a cam surface 85 of an operated lever 10 and the tooth 39 engages the pinion 17 or 21 to advance,the totalizer wheel one step in the appropriate direction. The lever 10 is then restored by the action of the tooth 39 on a surface 87. The revolution counter has a similar transfer mechanism. Zeroizing-mechanism. Depression of a zeroizing key for the totalizer'moves the totalizer frame laterally so that the intermediate pinions 19 engage pinions 52 with mutilated teeth on a shaft 50. On rotation of the shaft 50, the pinions 52 rotate the pinions 19 and totalizer wheels to the zero position in which mutilated teeth of the pinions 19 are adjacent to the pinions 52. The revolution counter may be zeroized independently in a similar manner.