Patent GB-265140-A (GB)
Title: Improvements in or relating to printing mechanism for calculating machines
IPC: G06C11/04
Filed: 1926-04-26
Abstract: 265,140. Burroughs Adding Machine Co., (Assignees of Horton, A. A.). Jan. 29, 1926, [Convention date]. Adding and subtracting apparatus with printing-mechanism; controlling indication and printing of zeros.-In a key-set and independentlyoperated recording machine, improvements are described in connection with the mounting of the type bars on the differential actuating segments, the hammer impression mechanism, and the alining means for the type bars. The invention is shown applied to a machine of the type described in Specification 265,122 wherein, upon an operation of the main shaft, the totalizer actuating segments 235 are moved differentially unde.r the control of the amount kevs 10. Pivotally mounted on each segment is a type bar 264 the connection comprising a pin 265, Fig. 1, on the bar projecting through a hole in the segment, a lever 266 engaging a groove in the pin to hold it in place and having a notch engaging a pin 268 on the type bar, and a spring 269 connected to one end of the lever 266 and attached at its other end to an arm of the segment. This spring serves as a means to restore the type bar, after effecting an impression, to its normal, forward position. The impression hammers 270. which are supported on a rod 271. are controlled by springs 273 and are guided in the slots of a comb plate 272 secured to the frame plate 56. The noses of the hammers normally engage the front edges of the type bars and the rearward extension arms of the hammers are provided with lateral projections 277 for co-operation with latches 283. These latches are normally held out of engagement with the hammers by projections 285 on the ends of the actuating segments when in their normal position. Movement of a segment resulting from the depression of a key in the corresponding bank allows the latch to move to a position to engage the hammer projection 277. The latches 283 are mounted on a rod 281 and each is connected by a spring 282 to a yoke 279 the spring being attached to a rod 284 seated in notches on the arms 280 of the yoke. The yoke 279, Fig. 4, is carried by a rock shaft 278 operated by means of a second yoke member 286 having arms 287. 288 extending over and under the rod 281 and bifurcated at its end to engage a roller 290 on an arm of a yoke member 143 connected by a link 144 to the main drive cam plate 74. The yoke 286 is slidably mounted on the shaft 278 so that it can be moved through connections 296, 300 Fig. 5, co-operating with a non-print key to disable the printing mechanism. During the movement of the latches the hammers are cocked and towards the end of the stroke projections 292 on the latches engage a fixed stop rod 293 to release the hammers to effect the movement of the type bars against the platen. After a printing impression the projections 285 on the actuating segments move the latches to normal position and the springs 282 through the return of the roller 290 restore the latch operating mechanism to normal position. Zeros to the right of the highest significant figure of an item are printed by providing each hammer 270 with a projection 276 extending behind that of the next lower order. In order to align the type bars when an impression is being taken an aligning bar 305, Fig. 7, with an edge 306 adapted to be rocked into engagement with the teeth of the actuating segments is provided. The bar 305 carries a spring-controlled arm 307 provided with a roller 308 engaging the end of a lever 312 and with a projection in contact with the rear edge. of the yoke member 143 to be moved thereby to throw the edge into the space between the teeth of the segment.