Patent GB-747352-A (GB)
Abstract: 747,352. Calculating-apparatus. BELL PUNCH CO., Ltd. Jan. 12, 1955 [Jan. 12, 1954; Jan. 12, 1954], Nos. 26776/53 and 913/54. Class 106 (1). In a power-driven calculating machine, multiplier and multiplicand factors are set in turn on the same keyboard and the machine is keyresponsive to the setting of the multiplicand digits, repeated operations of the actuating mechanism being effected automatically a number of times determined by a previously-set multiplier digit. Prior to a multiplication operation, a control lever 88, Figs. 1 and 6, is rocked about its pivot 89 in one direction or the other according to whether multiplication is to proceed from the highest order of the multiplier downwards or in the reverse direction. The multiplier is then set on the full keyboard shown. During this setting, the machine is keyresponsive to enter the multiplier in a register 65. After restoring the control lever 88, the multiplicand is set in the orders appropriate to the first multiplier digit to be used. The keys are held depressed until the actuating mechanism in each order in which a significant digit has been set has operated a number of times equal to the first multiplier digit, when the machine ceases to operate. The corresponding order of the multiplier register is zeroized during this process. The operator then manually column-shifts the multiplicand setting, whereupon the machine again continues to operate until each multiplicand digit has been entered a number of times corresponding to the second multiplier digit. These operations are repeated until the entire multiplier register is zeroized. Adding. The invention is applied to a fullkeyboard, key-responsive machine generally similar to that described in Specification 699,914 in each order of which, on the arrest of a stopbar 22 by a depressed key stem, a bar 9 continues to move forwardly and depresses, through a link 23, the bar 22 so that an extension 46 thereof rocks a trip lever 30 to release a lever 13 which engages a differentially-set actuator 3 with a totalizer pinion 4 and depresses a connector 54. A motor-driven ratchet-wheel 57 then operates through the connector 54 to restore the parts, the actuator 3 finally disengaging the totalizer pinion. At the end of each operation, a latch 29 re-engages the actuating mechanism to prevent a further operation. Setting and indicating the multiplier. Rocking of the lever 88 cams the multiplier register frame 65 about a shaft 68 so as to mesh denominational pinions 73 therein with gears 85 geared to the totalizer pinions 4. The pinions 73 constantly mesh with pinions 71 fast with indicating drums 69. Thus, on depression of the amount keys, entry into the multiplier register is effected. Toothed sectors 77 are also geared to the drums 69 and longitudinally set selector rods 80 in accordance with the multiplier digits. The multiplier register is then restored by the lever 88, pawls 93 rocking a stirrup 94 to disengage detent pawls 95 and so to cause zeroizing of the totalizer 4. Multiplication. When the control lever 88 is rocked prior to the setting of the multiplier, a sequence bar 116, Fig. 6, is moved in a corresponding direction by one of two fingers 124, 125 of a segment 122 against the action of a spring 130 or 131. The springs 130, 131 are secured to a lever 127 coupled with lost motion to the lever 88 and normally latched by one or the other of two pawls 88a, 88b according to the direction in which the lever 88 was last moved. When the lever 88 is returned to its central position, the sequence bar 116 is returned by the loaded spring 130 or 131 until the first of a series of lugs 118 engages the displaced selector rod 80 of the first multiplier digit. The rod is thus displaced laterally against one of a pair of spring arms 100 so as to co-operate with one of two associated fingers 112 in a plate 113 as shown for the central rod 80 in Fig. 5. The rear end of each rod is bifurcated, formed with vertical abutment faces 109, Fig. 8, and carries a pawl 105 which is adapted to hold a cooperating finger 112 against the faces 109. When the multiplier register is returned to its normal position, a link 134 releases the plate 113 for counter-clockwise rocking about a rod 114 until the appropriate finger 112 is latched by the pawl 105 of the laterally-displaced selector rod 80. Counting sectors 135, one for each order, are thus rocked by the plate 113, also about the rod 114, to positions corresponding to the first multiplier digit. Following the depression of the keys representing the multiplicand, a switch bail 158 is rocked and through a link 155 rocks a frame 139 to engage a detent pawl 144 with each sector 135. Also carried by the frame 139 are control pawls 146, each of which normally co-operates with a stud 147 in the corresponding sector 135 and a lever 148 to maintain an arm 152 out of the path of the corresponding actuating-mechanism latch 29. The latter is, however, held ineffective by the arm 152 when its sector 135 is moved from normal position. Thus the actuating-mechanism of each order continues to operate until its sector 135 is returned to normal position. This is achieved by the repeated operation of a pawl 167 carried by the actuator-engaging lever 13. The effective selector rod 80 is restored with the plate 113 which is itself returned by the sectors 135. When the rod 80 reaches its initial position, the lug 118 of the sequence bar 116 escapes past a shoulder 119 of the rod which is then returned laterally by the spring 100. The sequence bar then moves laterally under the action of the spring 130 or 131 until a lug 118 engages and renders effective the selector rod 80 registering the next significant multiplier digit, the lugs 118 being more closely spaced than the rods 80. As the operator's fingers are transferred to effect the new multiplicand setting, the detent pawls 144 are temporarily released to allow the sectors 135 to assume their new positions. The above operations are then repeated until all the selector rods 80 and drums 69 of the multiplier register are restored. When the totalizer is finally zeroized, a lever 159 is rocked and a stud 164 therein disengages the link 155 from the switch bail 158 to prevent unnecessary movement of the frame 139. Re-engagement is effected by a link 166 when the multiplier register is rocked prior to a multiplication operation. According to the first Provisional Specification, the selector rods are lowered to effective position sequentially under the control of a camshaft and the shaft carrying the toothed counting sectors is raised on depression of any key to bring the sectors into co-operation with their restoring pawls.