Patent GB-472777-A (GB)
Title: Improvements in adding machines of the ten-key type
IPC: G06C7/10
Filed: 1936-08-10
Abstract: 472,777. Calculating - machines. TRIGGS, W. W. (Underwood Elliott Fisher Co.) Aug. 10, 1936, No. 21951. [Class 106 (i)] A ten-key type adding-machine is provided with an additional zero key and a number of multiple-zero keys, the depression of the said additional key or of any of the multiple-zero keys causing the setting of the final zero or number of zeros of an item and automatically starting the machine operation to enter the set item. Setting mechanism. The depression of a numeral key or of the ordinary zero key 15, Figs. 4 and 7, rocks a lever 17 connected by a link 18 to a crank 19 pivoted to a rod 20 slidably guided in a post 22, Fig. 1, and co-operating with stops 24 in a stationary bank 31. The post 22 is carried on a frame 25, Fig. 4, urged clockwise by a spring 30 and controlled for step-by-step movement by a rack 27, Fig. 1, urged into engagement with the post 22 by a spring 29. Each crank 19 can engage a universal bail 32, Fig. 7, connected by a crank to a rod 35 which thus pushes the rack 27 away from the post 22, the rod 35 engaging the rack tooth to prevent more than the slight movement of the frame 25 necessary to take the post 22 over the edge of the next rack tooth. When the rod 35 is withdrawn, the frame 25 completes its step of movement. The frame 25 is connected by a pin-and-slot connection 47, Fig. 7, with a sliding carriage 46 which supports rods 48 connected by hinged members 49 with the totalizer, actuating racks 38, the rods 48 being differentially controlled by the set stops 24. The pivoted frame 25 is connected by a pin 80, Fig. 4, to a link 79 having a roller 78 which is engaged by a link 77 and pushed forwardly to restore the frame 25 and carriage 46 at the end of a machine operation. The set stops 24 are restored by a bar 52 carried by the carriage 46. Repeat mechanism. The depression of the repeat key 81 lowers the link 77 below the path of the roller 78 and thus prevents restoration of the frame 25 and carriage 46. Additional and multiple-zero keys and mechanism. The depression of an additional or a multiple-zero key 84, Fig. 1, rocks a corresponding crank 90 connected by a link 93 to a crank 94 pivoted to a member 95 having an end 95a of a width corresponding to the number of zeros on the connected key 84. The zero stops 24‹ have depending ends 107 so that they can be operated either by a rod 20 controlled by the ordinary zero key 15 or by any of the members 95. When any multiple-zero key is depressed, a corresponding number of zero stops 24‹ is thus set into active position. The ends 95a of the members 95 have lugs 113 which engage stops 114 slidably mounted in a bar 127. A stop 114, situated a number of denominations away from that column of stops 24 in which the last digit was set, is thus moved forward in the bar 127. Each member 95 has another lug 117 engaging a common lever 118 to which is pivoted a pusher 120 normally riding on a raised rail 124 of the rack 27. When a member 95 is moved by the depression of any multiplezero key, the pusher 120 is retracted behind the rail 120 so that when the key is released a spring 123 moves the rack 27 to free the post 22 whereby the frame 25 and carriage 46 move until arrested by the set stop 114, this movement corresponding to the number of zeros on the depressed key. The frame 25 and carriage 46 are moved an excess distance to the left, Fig. 4, when they are restored by the link 77. A projection 116 on the carriage thus engages a lug 154 on a plate 151 mounted beneath the bar 127 by inclined pins and slots 154a. The plate 151 thus moves forward on the bar 127 to restore the projected stop 114. The pusher 120 at the same time climbs the end 124a of the rail 124 into inactive position.. The frame and carriage then move to their normal initial position. Initiating operation by the additional and multiple-zero keys. When the frame 25 and slide 46 move (to the right in Fig. 4) after being released by the depression of the additional zero key or any multiple-zero key, and engage the set stop 114 carried in the bar 127, they move the bar 127 to the right until the righthand one of two pins 134 meets a fixed frame 131. A lever 145 pivoted to the bar 127 thereupon disengages a latch 141 from a stop 143 to allow a spring 140 to rock a lever 138 anticlockwise about its pivot 148. The lever 138 moves a rod 59, Fig. 5, against the action of a spring 149, this rod also being connected to the " start " key 57. The rod 59 through a lever 60 and link 61 withdraws a pin 63 away from a clutch dog 64 which dog then engages teeth 67 on a motor-driven clutch wheel. The motor contacts 71 are closed at the same time. The clutch dog 64 is carried by a disc 65 secured to a shaft 66 connected to rock the main shaft 56 through arms 74, 72 and a link 73. At the end of one rotation, the (now restored) pin 63 engages the dog 64 to stop the machine. Towards the end of the first half of the cycle, the lever 138, Fig. 4, is restored by the arm 72 on the main shaft 56 and re-latched by the latch 141. The bar 127 is restored by a spring 135 when the frame 25 and carriage 46 are restored by the link 77.