Patent GB-451121-A (GB)
Title: Improvements in and relating to printing calculating machines, adding machines, cashregisters or the like
IPC: G06C7/08
Filed: 1935-04-02
Abstract: 451,121. Calculating-apparatus. MERCEDES BUROMASCHINEN-WERKE AKT.- GES., Benshausen, Prussia, Germany. April 2, 1935, No. 10219. Convention date, April 18, 1934. [Class 106 (i)] In a machine of the ten-key type the item to be registered is set up by means of keys denomination by denomination in value setting members arranged on a carriage adapted to move to bring each value setting member, after being set, directly into driving engagement with the actuator members which when the machine is operated actuate the totalizer pinions and set the printing members. The invention is shown applied to a motor-operated machine, with a control lever (not shown), for setting the machine for addition or subtraction, and two operation control levers. Operating by motor. A motor M, Figs. 4, and 5 when energized drives a shaft 48 carrying a gear wheel 73 that meshes with a pinion 75 on a stub shaft 74, the motion being transmitted through a shaft 79 coupled to the shaft 74 to gearing 84, 87, and 88, Fig. 3. The wheel 88 is provided with a frictional coupling whereby it may be connected to a wheel 97 to drive the latter when it is freed by the withdrawal of the holding teeth 393 on the long arm 385. The shaft 48 carries one element, constituted by a cam 50, Fig. 6, of a clutch, the other element of which, namely a pawl 59 is pivoted in a cover plate 57 loose on the shaft. The clutch is controlled by the nose of a pawl 27 acted upon by a lever 20 of the operation control key 20t or by the nose of a pawl 40 connected by a link 38 to a lever 21 of the operation control key 21a. The key 21a when depressed takes with it the key 20t so as to render the clutch operative for one-half a revolution for addition and subtraction operations ; depression of the key 20t alone merely releases the clutch pawl 59 so that the shaft can rotate through a number of complete cycles. Keyboard and differential setting mechanism. The numeral keys 328, Figs. 1, and 3, have stems passing through slots in the upper and lower plates of a key frame 330; each stem is formed with a cam slot 350 in which engages a pin 351 of a corresponding slide 352. The slides 352 are guided in the side members of the key frame and have inwardly directed projections on their rear ends with pins 354 mounted in slots 355 in the side members arranged in arcuate formation. Depression of a key causes the rear end of its slide to be projected into the path of movement of a projection 125 on the setting and indicating wheels 100 mounted in a laterally movable carriage. At the same time the lower end of the key, by engagement with an irregular shaped member 389 or 390 secured to the opposite sides of the lever 385, lowers the lever to withdraw the teeth 393 thereon from the wheel 97 which is thereupon free to rotate with the motor driven gear 88 until the projection 125 on the aligned setting wheel is arrested by the projected slide 352. After the wheel has been arrested the lower edge of the member 389,390 co-operates with a surface 368a of a lever 368 pivoted on a shaft 367 which is rocked and through a bent off end 374 operates a lever 377a of a known form of escapement mechanism to displace the setting wheel carriage one step to the left to move the set wheel into engagement with the teeth of the first actuating sector 108 while the second setting wheel moves into engagement with the wheel 97. The zero key 360 is mounted on a slide 359 and its lower end co-operates with the lever 368 to operate the escapement mechanism but has no effect on the lever 385. The setting wheels have a numeral bearing section viewable through an aperture in the casing to indicate the item set. Totalizer actuating mechanism. The setting operation having been completed the key 21a is depressed to free the clutch. The clutch casing has a cover disc 57 with a notch 58, Fig. 5, which receives a pin 169 on an arm 168 secured to a shaft 149 aligned with the shaft 48 so that when the clutch is engaged the shaft 149 is rotated. A second arm 148, Figs. 2 and 8, on the shaft 149 and the arm 168 are connected by links 146, 171 to plates 140, 166, secured to toothed arcuate racks 135, 161, guided for movement on fixed plates 127a, 154. Rigidly mounted on the shaft 149 is a wheel 265, Fig. 3, that forms one of a train of gears 264, 267 on shafts 262, 266. On the shaft 266 are mounted cams 268 ... 270, Figs. 2 and 10 ; the cams 269, 270 are normally set to cooperate with levers 272, 272a provided with cam slots engaging a shaft 274 of the totalizer frame so that when the shaft 149 is rotated the cams operate the levers to throw the pinions 324 on the shaft 274 into engagement with the actuating sectors 108. If a subtraction operation is to be performed the machine is conditioned by depression of a subtraction key (not shown), which effects a displacement of the shaft 266 to the position shown in Fig. 10 to bring the cams 269, 270 into co-operative relation with levers 287, 287a operatively connected with levers 282, 282a having cam slots engaging the shaft 274 so as to throw the pinions 324 into engagement with the idler gears 294 that mesh with the actuating sectors 108. The engagement of the pinions with the sectors 108 or with the idler gears 294 is effected during the time that the lever systems 146, 148 and 168, 171 move out of their dead centre position whereupon the racks 135 161 are moved to the left Fig. 8 and effect the clockwise rotation of toothed sectors 138, 164 around the shaft 99 of the setting wheels. These sectors carry a beam 119 which picks up successively the edges 100a of the setting wheels and restores them to their initial zero position at the same time imparting movement to the actuators 108 to operate the totalizer pinions 303 through the gears 324 and to set the type elements T. At the end of this half cycle of operation the impression mechanism is actuated, the setting wheels are returned to the cams 269, 270, are effective to disengage the totalizer gear wheels 324. The pawl 40 also is in position to permit the clutch to continue to rotate the shaft 149 to complete its revolution. Transfer mechanism. The totalizer pinions, 303 gear with the wheels 324 through idler gears 306, 318, Figs. 3 and 9 ; each gear 318 carries a transfer tooth 319 that acts to displace a lever 314 so as to slide a lug 321 thereon away from a nose 320 on a lever 309 arranged on the left of the corresponding gear 306 to permit the lever to move in a clockwise direction. During the second half of the revolution of the shaft 149 cams 150, 174, Fig. 8, thereon co-operate with the ends of the limbs 183, 184 of a yoke 185. The yoke 185 carries a shaft 188 with pivotally mounted pawls 189 which in the movement of the yoke are adapted to engage, by means of their upper ends 194, any of the transfer levers 314 that have been displaced so that the lower ends of the engaged pawls move into contact with corresponding toothed slides 251 and swing them into engagement with the gears 324. After the engagement has been completed a staggered arrangement of cams 261 on the shaft 262 and a co-operating system of levers is operative to raise or lower the slides to effect transfer according as the machine is conditioned for addition or subtraction. In the additive position the cams engage projections 260 on levers 228 and swing them anticlockwise so that a projection 240 on each of the levers acts on a lug 241 of a corresponding lever 238 to swing the lever clockwise around the shaft 236 thereby raising the corresponding slide 251 by the engagement of a pin 250 on the slide with the forked end of the lever. When the machine is set for subtraction the shaft 266 is displaced to bring the cam 268 thereon into alignment with an arm 230, Fig. 9a, on a shaft 229 which carries the shaft 236 on which the levers 238 are mounted. During the second half of the cycle when the cam 268 is operative the arm 230 is rocked to displace the shaft 236 and its levers 238 so as to disengage the lugs 240, 241 and engage the lugs 243 of the levers 238 with the lugs 249 of the levers 228. The rocking of the levers 228 by the cams 261 thus produces an anticlockwise movement of the lever 238 to lower the slides 251 to effect the transfer. Multiplying by repetition. The multiplicand is introduced into the setting wheels 100 and the key 20t is depressed and the machine executes a number of cycles until the key is released. Printing totals. In a total taking operation a key controlled mechanism operates to effect the engagement of the pinions 324 of the totalizer train with the idler gears 294. The gears 294 are loose on a shaft 293 and secured to the shaft are mutilated gears 295 that co-operate with the left half of the pinions 324. These pinions are broad enough to engage both gears 294, 295 and the left half of each pinion is mutilated in a manner similar to the gear 295. By this means when the shaft 293 is rotated the gears 295 effect the rotation of the pinions 324 until the mutilated portions are oppositely disposed and impart movement to the gears 294 and sectors 108 in accordance with the amount standing on the totalizer numeral drums.