Patent GB-745852-A (GB)
Title: Improvements in or relating to record card controlled adding machines
Inventor: WILDY RONALD GORDON
Filed: 1953-09-09
Abstract: 745,852. Statistical apparatus. POWERS-SAMAS ACCOUNTING MACHINES, Ltd. Sept. 2, 1954 [Sept. 9, 1953], No. 24972/53. Class 106(1). A record card controlled adding- machine of the type comprising normally inactive total-taking mechanism a designation sensing device operative to sense changes of designation of cards fed in succession thereto, and control mechanism operative by the designation sensing device on sensing a change of designation to render active the total-taking mechanism, is characterized by a normally inactive interrupter device to render the control mechanism ineffective to effect activation of the total-taking mechanism, and a normally inactive delay device rendered active by an operation of the total-taking mechanism to effect actuation of the interrupter device and to maintain the interrupter device in the actuated condition thereof until determination by the designation sensing device of the feeding thereto of two successive cards of like designation. The total taking mechanism to which the invention is applied is wellknown and is fully described in Specification 371,849. The mechanism according to the present invention comprises a normally inactive interrupter device consisting of a two-revolution clutch comprising a driving gear 74, Fig. 1B, pivoted on a fixed delay shaft 75 continuously rotated from the main shaft 13 by gearing, not shown, in a manner such that the gear 74 makes one revolution for two revolutions of the main shaft 13. The gear 74 carries two clutch pawls 76 which are freely mounted on pivot pins 77 secured to the gear and urged by springs to the operative positions thereof at which the nose 78 of a pawl can be engaged with the step 79 of a clutch dog 80 secured to a delay cam 81, the dog. 80 and cam 81 being freely rotatable about shaft 75 and retained in one or other of two predetermined positions thereof by co-operation between one or other of two pins 82 carried by the cam 81, and a detent arm 83 pivoted at 84 and urged by a spring 85 towards the path of the pins 82. During normal operation, i.e. when cards of like designation are being passed therethrough one of the pawls 76 is retained in the tripped position, as shown in Fig. 1B, by a trip lever 86 freely pivoted on a spindle 87 and connected with a trip .arm 88 also pivoted on the spindle 87. Connection between lever 86 and arm 88 is effected by a pin 89 carried by arm 86 to extend into a slot 90 in lever 88. A spring 91 acts normally to maintain the pin 89 engaged with the top of the slot 90. The trip arm 88 has an overturned portion 92 for co-operation with the peripheral contour of a trip cam 93 secured to the total taking shaft 31 for rotation therewith. When a total taking operation is initiated, the total initiating shaft 31 rotates counter clockwise as viewed in Fig. 1B, and cam 93 turns arm 88 clockwise to raise lever 86 out of tripping engagement with the pawl 76. On being released by lever 86 the nose 78 of the pawl engages step 79 of dog 80 and gear 74 causes counterclockwise movement of both dog 80 and delay cam 81. Operation of the delay cam 81 raises roller 95 and lever 96 causing bell-crank 101 pivoted at 102 to rotate clockwise, thereby moving bar 106 to the right, Fig. 2A, so that the " Y " arms 51 are moved and co-operate with the sub-total taking bar 48. If the next card fed to the designation sensing device has the same designation the sub-total bar 48 will remain in the lower position and " Y " arms 51, 52 will be swung to positions counter clockwise so that the tail of Y arm 51 is out of alignment with sensing finger 209, so that when the link 111 is raised it will not engage the tail of Y-arm 51 and link 118 will not be raised. Since link 118 is not raised a pawl 76 engages slip 79 on dog 80 and moves the cam 81 angularly through 180 degrees until the driving pawl is tripped by the first trip lever 86 when the cam will again be detented in the position shown in Fig. 1B, and link 97 is lowered, allowing a spring to restore bars 48, 58, and Y-arms 51 to their normal positions in which they will remain until the designation sensing device again senses a change of designation to initiate a further total-taking operation of cam 93.