Patent GB-912785-A (GB)
Title: Accounting or similar calculating machines
IPC: G06C15/06
Filed: 1961-09-27
Abstract: 912,785. Calculating-apparatus. NATIONAL CASH REGISTER CO. Sept. 27, 1961 [Oct. 1], 1960], No. 34670/61. Class 106 (1). A calculating-machine can be conditioned for a plurality of multicycle operations with latched data entry keys, each of which include a data entry followed by a total or subtotal cycle. The differential actuators are moved out of possible engagement with depressed keys before the total or subtotal cycle. As described the operation consists of an additive data entry cycle, a sub-total conditioning cycle and a subtotal cycle. The number of operations required are set by turning a graduated knob 29 (Fig. 5) which is stepped back as each operation is completed. The operation is set up by setting the knob 29 to the required number and pushing lever 31 (Fig. 2) rearwardly. This brings into circuit three solenoids which are energized in turn to initiate the three cycles of the operation. Lever 31 is released at any time by depressing stopkey 33. The motor 34 (Fig. 2) is started by tripping latch 49 (Fig. 5) by means of lever 75 which is linked by member 78 to the main trip lever 82 (Fig. 3) normally operated by depressing control keys on the keyboard. A motor shaft 58 is then driven anti-clockwise and is connected in known manner to a rear drive-shaft 50 which for every rotation of the motor shaft oscillates first anti-clockwise and then clockwise. There is a known type of singlerevolution clutch (Fig. 12, not shown) in which, inter alia, a lever 45 (Fig. 2), which moves when latch 49 is tripped, is rocked by by a cam 72 back to the home position at the end of a revolution of shaft 58 to restore the trip latch 49. While lever 45 is in the home position a switch 92 is closed through the connection of lever 89 and lever 45 by link 86. A switch 94 is closed by roller 96 on rearward actuation of lever 31. When both switches 92 and 94 are closed a trip solenoid 103 (Fig. 5) is energized which acts directly on lever 75 to trip latch 49. As soon as the motor starts a cam 254 on shaft 242 opens contacts 103a to de-energize solenoid 103 (see below). The keyboard has a known latching bail (not described) and a key release bail 120 is rocked by actuation of a correction key which bears on stud 121 (Fig. 3). Disengaging differential actuators from keys.- The actuators are the known stop-bars 122 (Fig. 4) each rotating a differentially diverging lever 126 linked to the type bars 130. A rack lever (not shown) commonly pivoted with a diverging lever and coupled therewith enters a denominational value from the keyboard into a totalizer. A bail 131 acting on the diverging levers is moved forward in the first half of a machine cycle to release them to the stop-bars and back in the second half. The forward end of each stop-bar 122 (Fig. 5) is held in a comb 128 which is movable laterally by a lever 136 and link 141, a pin 137 on the lever being guided in a drum cam 251 on shaft 242. Printing mechanism.-When a latch 152 (Fig. 7) is tripped a printing hammer 151 is released against a type member 150 carried on the typebar 130. When bar 130 is moved upwardly an interponent 153 bearing on stud 143 on bar 130 rocks anti-clockwise on a bail 154 carried between arms 156 (one shown). At about the midpoint of a machine cycle a pin 159 on cam 158 on rear drive-shaft 51 contacts the tail 160 of an arm 156 moving the bail 154 and interponent 153 towards latch 152. If interponent 153 has been rotated it is in position to trip the latch 152. Means are provided to inhibit movement of interponent 153, and thus printing even though bar 130 has moved upwardly. These consist of a bail 161 (Fig. 7A) spring-urged anti-clockwise and a bail 176 extending across the frame and preventing movement of interponent 153 sufficient to trip latch 152. If bail 161 is rotated clockwise lever 172 rotates bail 176 to permit interponent 153 full movement. Record feeding.-The record is advanced by a pawl 192 (Fig. 7) bearing on a ratchet-wheel (not shown) and carried on an arm 183 which supports with a like second arm a feed bail 185. A yoke 189 carries a roller 190 and has a forwardlyextending arm 191 bearing on pin 159. As shaft 51 moves yoke 189 swings forward carrying bail 185 with it. The rearward motion of the bail 185 at the end of a machine cycle causes pawl 192 to move the ratchet wheel attached to the platen. Motion of yoke 189 is prevented by an arm 196 which is swung out of the path of the yoke by a bell-crank (Fig. 8, not shown). Multiple cycle operation controls.-When lever 31 (Fig. 2) is actuated it latches on a shoulder 209 of lever 208. Lever 31 may be unlatched by depressing key 33, the shank of which will pivot lever 208. A link 220 connects lever 31 through shaft 224 and link 226 to a rock-shaft 230 (Figs. 5 and 9). Rotation of shaft 230 will also unlatch lever 31. Shaft 230 also carries an arm 233 a pin on which normally lies in the path of a drive pawl 235 (Fig. 9) pivoted on arm 240 on the main drive-shaft 108 (Fig. 4). During a multicycle operation the drive pawl engages a pin 246 to 248 in a drive member 243 secured on cam-shaft 242 and draws the pin rearwardly, thus rotating the shaft through one-third of a revolution. In normal operation of the machine the pin 233 is engaged by cam surface 239 on the drive pawl and the pawl hook 238 is raised clear of the pins 246 to 248. When lever 31 is actuated rock-shaft 230 is rotated and the pin 234 moved clear of the path of the drive pawl which then operates as described above. Cam-shaft 242 (Fig. 5) carries the drum cam 251 for bending the differential actuators clear of the depressed keys and cams 252 to 254 for operating switches 103a to 203a, 303a controlling solenoids 103, 203, 303. Multiple cycle operation.-The first cycle is additive data entry. The data entry keys are set and automatically latched and, after setting the knob 29 (Fig. 5) to the number of operations required, lever 31 is operated. This closes switch 94 (Fig. 2) and since, with cam-shaft 242 in the home position cam 254 keeps contacts 103a closed, the trip solenoid is energized starting the motor for a normal data entry cycle, without print or record feed. At the end of the first cycle cam-shaft 242 is rotated by the rearward motion of drive pawl 235 so that contacts 103a are opened and contacts 203a closed, energizing solenoid 203 (Fig. 5). The second cycle thus initiated is a non-add cycle. The non-add and total lever 279 (Figs. 3 and 4) is spring-urged anti-clockwise but movement is blocked by the abutment of plate 286, coupled with latch-plate 271, and on an ear 281 on lever 279. Energization of solenoid 203 rocks a lever 266 carrying a cam 267 which acts on a pin 272 to move latch-plate 271. The result is that lever 279 is free to move and trip the motor by the action of an arm 280 on pin 278 carried by bell-crank 275 coupled to the main trip lever 82. Plate 271 is linked to a non-add lever 283 (Fig. 4) which operates in known manner (not described) to control the non-add cycle. In the second half of the second cycle shaft 108 (Fig. 3) rotates clockwise and a pin 288 on drive-plate 107 engages a pawl 289 on lever 279 to restore the lever. At the end of the second cycle shaft 242 is rotated to cause cam 252 to close contacts 303a. The drum cam 251 is now effective to rock lever 136 (Fig. 5) and thus move the comb 128 laterally, preventing the stop-bars 122 from engaging depressed keys during their rearward motion on the third cycle. The third cycle is a sub-total cycle. The energized solenoid 303 rocks shaft 305 to pull link 309 (Fig. 3) downwardly unlatching lever 316 and permitting toothed levers 320 geared to lever 316 to rotate clockwise. The toothed lever 320 rotates shaft 165 which carries a finger 324 (Fig. 4) so that the total lever 28 is rocked anti-clockwise to initiate the sub-total cycle. Pin 325 bears on arm 163 of print bail 161 and the consequent movement of the bail permits printing during the cycle as described above. A pin 327 on lever 28 acts to remove the blocking member 196 from the path of arm 191 (Fig. 7) and thus to permit record feed as described above. Bell-crank 348 is rocked by lever 28 through link 340, bell-crank 314 and link 344. The bell-crank rocks plate 286, thus unlatching lever 279 and tripping the motor. A finger on bell-crank 348 is latched by ear 281 of lever 279 retaining bell-crank 348 and lever 28 in their actuated positions. The lever 316 (Fig. 3) and associated parts are relatched at the beginning of the machine cycle by the action of a pin 323 on link 106 connecting the main and rear drive plates. The remainder of the members are returned when lever 279 is unlatched by pin 288. At the end of the third cycle, shaft 242 is rotated by drive-pawl 235 and either the operation is repeated by initiation of a first cycle or lever 31 is automatically moved forward to open contacts 92 and cease multiple cycle operations. The control-knob 29 is mounted on shaft 260 (Fig. 2) which has a cam 263 opposite the " 0 " graduation of the scale of the knob. At each complete revolution of shaft 242 a tooth 258 (Fig. 5) returns the knob 29 one graduation through gearing 295, 296, 261, until the cam 263 engages a pin 212 on latch 208 of lever 31 and trips the latch, whereupon lever 31 returns to home position. Repetitive printing of the same number can. be performed by arranging that the third cycle is a total operation, as by causing the lever 28 to be moved clockwise.