Patent GB-722701-A (GB)
Abstract: 722,701. Calculating-machines; cash registers; transfer mechanism. CHO, C. L. Jan. 14, 1949, No. 1161/49. [A Specification was laid open to inspection under Sect. 91 of the Acts, July 18, 1949.] Class 106 (1). A cash-register or a calculating-machine has longitudinally - movable differential - actuating racks which engage directly with the stems of the numeral keys and with one or more totalizers, each rack being connected to one arm of a three-armed lever, a second arm thereof operating item-printing mechanism and a third arm operating item-indicating mechanism. Keys and keyboards. The numeral keystems 5, Fig. 2, have projections (not shown) which upon depression abut against a plate 2 and which are engaged by a rockable detent bar 8 to hold the keys depressed. The keys are restored by a single spring 6 threaded as shown in Fig. 8 through notches in the sides of the stems 5. Differential actuators. Racks 20 have steps 22 to engage the stems of keys 4 ... 8, these stems being of corresponding different lengths, and have also teeth 22 to engage the stems of keys 1 ... 3, these stems having a common length. " 9 " is entered by the abutment of the lowest step 22 with a fixed bar 43. Grand and items totalizers 16, 17 are engaged with the racks by means not described. The racks 20 are driven to the right by a general operator bar 58 coupled to the racks by spring-pressed detents 60. The bar 58 is reciprocated at each cycle by the engagement of a pin 194, Fig. 3, on a disc 189 on the main shaft 76 with a slotted link 192 which rocks a lever 199 linked to the bar 58. The slot in the link 192 causes the bar 58 to remain at rest during the second and fourth quarters of each cycle. Item printing on retained and on ejected strip. Each differential rack 22, Fig. 2, is connected by a link 61 to one arm 64 of a three-armed lever, another arm 56 of which is joined by a link 300, Fig. 4, to a sector 302 carrying two sets of type, one set printing on a retained strip 351 and the other on an ejected strip 320. A link 191, Fig. 3, pivoted to a slotted link 192 driven by a pin 194 to a disc on the main shaft 76 rocks an arm 178 and shaft 81 to operate a printing hammer 332, Fig. 4, by a toggle 333 and another hammer 352 by a connection 82, 84, 86, 87, Fig. 2. Ejected-strip feed. When the arm 178, Fig. 3, is rocked clockwise by the main shaft a spring-pulled sector 173 follows it until stopped by a detent 174. During its return, the arm 178 drives the sector 173 by a pin 172, the sector driving a strip-advancing shaft 88. During total-taking, the detent 174 is rocked clear of the sector 173 so that the latter makes a larger stroke to give a longer feed. Operating mechanism. Depression of the starting key 130, Fig. 3, rocks a control crank 207, 208, to free a clutch latch 209 on a disc 189 on the main shaft 76 so that the disc is driven by a pin 230 on a motor-driven wheel 190. Rocking of the control crank 207, 208 also allows a lever 201 to rock, by a pin 201a, an arm 202 to close a motor switch 204. The arm 202 is held in switch-closing position by a latch 198 moved into effective position by a spring-operated link 196 and crank 195 when a pin 194 on the main shaft disc 189 is moved away from the crank 195 as the disc 189 commences to rotate. At the end of its forward movement, the general operator bar 58 trips the lever 201 to free the control crank 207, 208 which then moves into a position to arrest the clutch latch 209 after one revolution. The starting key 130 is restored by a pin 271 on the shaft 272 of the lever 199 which .drives the general operator bar. Multiplying (repeating) mechanism. An item may be entered repeatedly a desired number of times by manually setting the desired number on a numeral wheel 259, Fig. 3, before depressing the starting key 130. A pin 259b is thus moved away from a latch 243 and allows this latch to rock so that its end overlies and keeps depressed the control crank 207, 208, whereby operation .continues for more than one cycle. At each excursion of the general operator bar 58 a disc 245 is rocked thereby to turn, through a ratchet 246, the numeral wheel 259 backwards one step until, in the zero position of said wheel, the pin 259b rocks the latch 243 to release the control crank 207, 208. Means for printing the multiplier figure are described below. Item indicating. Each three-armed lever 64, Fig. 2, connected by a link 61 to a respective differential rack 20 has an arm 52 joined by a link 51 to a sector 50 pivoted on a rod carried by arms 80 on a shaft 79. On the return motion of the sectors 50, the arms 80 are lifted by means not shown to engage the sectors-with pinions 97 of indicating drums 101 visible through front and rear windows 3a, 3b. The indicator remains set until the beginning of the next cycle, when a rack 103, Fig. 3, is moved to the right by a link 102 driven by the general operator bar 58 and drives the indicator-drum shaft 99 so that a comb 98 thereon turns the drums to a zero position defined by the engagement of an arm 96 with a stop 100. Transfer mechanism. Transfer levers 37, Fig. 2, for the totalizer 16 and similar levers 37a (not shown) for the totalizer 17 are pivoted on a rod 38 and rocked clockwise at a transfer point by a totalizer-wheel tooth 40, the levers being retained by detents 28, 31. A projection 33 of the lever is thus moved to the left of a foot 32, Fig. 9, of a transfer rack 44. The totalizers and. transfer levers are then lowered to engage the totalizers with the transfer racks 44 and to bring the projections 33 into the path of the feet 32. A transfer shaft 35 with helically disposed arms 33 then rotates, the arms engaging projections 36 on displaced levers 37 to return the levers anticlockwise so that the projections 33 thereon by engagement with the feet 32 drive the transfer racks 44 to effect transfer. A thin part 37b on each lever 37 allows the projection 33 of any unoperated lever to spring over the foot 32 when the totalizers are lowered, the lever thus being able to move into transfer-effecting position if it is then rocked as the result of a consequent transfer. The Specification as open to inspection under Sect. 91 comprises also the following matters :- Printing multiplier figure. The setting of the multiplier numeral wheel 259 is transmitted to a printing sector by means controlled by a snail cam fixed to the wheel and engaged by an arm which sets a pin to correspond to the multiplier setting. A stepped sector is then moved until it contacts the pin, the movement being transmitted to a printing sector. Subtotal-taking. Depression of the subtotal key frees the differential-actuating racks and also depresses a slide 148, Fig. 9, (Cancelled), which rocks a totalizer-engaging lever 393 to lift another slide 386 which lifts one or other of the totalizer shafts 18, 19 to engage a totalizer with the actuating racks. The subtotal key also shifts a bar 390 on the slide 386 to bring a notch in the bar beneath the shaft of the totalizer which is not to be operated. Total-taking. The total key operates in a manner similar to the subtotal key and also by a connection, not shown, slides the control cams 404, 405 along the main shaft 76 so that the totalizer-engaging lever 393 is operated to disengage the totalizer before the actuating racks commence to return. This subject-matter does not appear in the Specification as accepted.