Patent GB-245186-A (GB)
Abstract: 245,186. Dunker, J. G. Sept. 23, 1924. Adding and subtracting apparatus with several totalizers; attachments and connections to typewriters.-In a combined typewriting and computing machine a plurality of totalizers are arranged in groups for vertical and horizontal computation and associated with control means for selectively determining whether the item shall be. added to, subtracted from, or non-computed on the totalizers and with means for taking totals and sub-totals. Improvements are also described in connection with the transfer mechanism for the totalizers, correction of errors, paper-carriage tabulation, and ribbon-control mechanism. The invention is shown applied to the Ellis type of machine described in Specification 28253/08, the keyboard, printing, and typewriting mechanisms being identical. Operating by motors. The main shaft O<1> is oscillated by an arm O<51> and link 32 connected to one. member of a friction clutch operated by a worm gearing from a constantly running motor shaft 21, Fig. 1. The clutch comprises a ring 24 secured to the worm wheel 23, a steel clutch band 19, and a disc 17 to which the link 32 is connected; one end of the band is secured to the disc 17 and the other end is attached to a release lewer 15 normally held, to maintain the clutch free, by a lug 14 on a lever 11. The lever 11 is operated by a three-armed lever 6 connected to the starting bar 1 and to a circular lever 3 also connected to the bar 1. At the end of one revolution the lever 11 is reset to free the clutch by means of an adjustable pin 27 on the disc 17 engaging a cam surface 28 on the lever 11. Totalizer actuating, engaging, and control mechanism. The differentially movable slides R50 are coupled to upper and lower pairs of racks 40, 42, 41, 43 respectively (Figs. 5 and 7). Each pair of racks is associated with a pair of pinions 44, 46 which can be moved longitudinally so that one or the other engages with a pinion 52 adapted to actuate the corresponding denominational wheel of the lowermost totalizer 76 of the totalizer drum 68, Fig. 3. Instead of two slidable pinions 44, 46, a single pinion 44, Fig. 8, always in gear with the pinion 52 may be moved so as . to engage one or other of the pair of racks. The upper totalizer drum is carried by a shaft 64 and is rotated step by step in accordance with the movement of the paper-carriage by gearing 90 - - 93. The shafts of the totalizers are mounted in slots in end plates of the drum and their ends are engaged by rings 82 so as to hold the shafts in the slots and permit the pinions to engage alining rods 78 except in the lowermost position, where the ring is notched to permit the totalizer a movement to engage the actuating pinions 52. In this position the totalizer is held in the disengaged position by the engagement of the ends of the shaft with forked projections on arms 100 secured to a shaft 104. The shaft 104 is rocked at the end of the upward movement of the main operating arm 051 by reason of the pin 028 thereon engaging a member 270, Fig. 1, on the operating cam plate 062 which member is connected by a link 271 to a tree-armed lever 272, the rocking of which through an arm 274 and associated hooked member 282 engaging a block on an arm 286 secured to the shaft 104 rocks this shaft and lowers the arm 100 to cause the engagement of the totalizer. The totalizer is held in engagement by projections 120 on levers 114 engaging notches in the arms 100. The alignment of the totalizers is effected through a sprocket-like wheel 262 secured to a disc on the end of the shaft 64 and a roller 264 on a pivoted lever 265, Fig. 16, this lever being momentarily depressed by a slotted link 269 and arms 268, 230 on a shaft 158 when the shaft is rocked by a slide 233 co-operating with a cam 239 on a shaft 172 rotated by a ratchet and pawl arrangement 240, 242, Fig. 17, on the movement of a rack bar 243 connected to the main shaft 01 as described below. The link 269 is slotted to permit of the manual depression of the lever 265 or of the reversal of the totalizer drum. The mechanism for actuating and effecting the engagement of a lower group of totalizers is identical with that described above, the aligning of the totalizers being effected however by means of an arm 135, Fig. 2, carrying a latch 136 for engagement with any one of four notches in a segmental plate 133. The mechanism which automatically shifts the pinions 44, 46 to control whether the item shall be added, subtracted, or non-computed comprises a disc 296, Fig. 20, with a plurality of cam-surfaces 298 with an adding and subtracting portion and a cam-surfaoe 300 for non-computing; the disc is engaged by a roller 304 on a lever 302 to the lower end of which is pivoted a slide 306 connected by a pin and slot to the arm 286 and having a depending projection 310 arranged above the shaft 50 carrying the pinions 44, 46. When the roller 304 is engaged by an adding portion of the cam-disc, the projection 310 is positioned above a bell-crank 316, Fig. 22, that engages a slot in the shaft 50 so that when the arm 286 is depressed to engage the totalizer the shaft 50 is moved to effect the engagement of the pinions 44, 52. If the roller is engaged by a subtracting portion of the cam-disc the shaft 50 will be moved in the opposite direction through the arm 322, link 326, and bell crank 328, to bring the pinion 46 into operative position. When it is desired to print without computing the slide 306 is moved still further to the rear by reason of the low cam-surface 300, and a projection or wing 330 on the slide 306 that embraces the hocked member 282 frees the hooked end from the block on the arm 286 so that the arm is not rocked to engage the totalizer. The control of the lower group of totalizers for horizontal totals is effected by a cam disc 297, Fig. 23, on the shaft 64 and provided with cam surfaces, similar to the disc 296, co-operating with a roller on a lever 303 connected to a slide 307 operating in the manner described in connection with the slide 306. The. cam discs 296, 297, together with a disc 368 that control the tabulating mechanism for the paper-carriage, are joined together to form a unit and the outline thereof may be varied to suit the nature of the work to be dealt with. The discs are separated by a collar and are secured thereto by screws; the disc 297 has a slot 339, Fig. 23, engaging a pin 340 on the sprocket plate 261. The discs are removably mounted on the shaft 64 with the pin 340 in the slot 339 and an arm 341, Fig. 1, is secured to the end of the shaft, a spring being connected to the arm 341 and a pin on the disc 296. Errors correcting. To change the normal function of the machine or correct an erroneous item the discs 296, 297 are arranged to be displaced the length of the slot 339. This is effected by depressing an errors key or reversing lever 346, Fig. 25, which rocks an arm 351 rearwardly so that a spring-controlled bell crank lever 353 pivoted to the arm is swung up between the cam discs to engage a sprocket-like wheel 354 secured to the discs and cause the discs to rotate as stated. Transfer mechanism. The carry-over is effected by imparting an additional movement to the actuating racks. Each totalizer pinion carries a twopointed cam 80, Fig. 13, which at the end of a revolution of the pinion trips a. corresponding trip lever 142 so as to move the depending limb 148 out of engagement with a lug 150 on a carrying arm 152 pivoted to an arm 156 freely mounted on a shaft 158. The lug extends laterally under the rack of next higher denomination, and when thus freed is adapted to enter a recess in the rack when the latter has returned to its normal position, whereupon a horizontal slide 167, with a T-shaped end 168, 169, abuts against the raised carrying arm to force the rack an additional step, the slide 16 being under the control of a spring and a cam 170 on the shaft 172. The racks are locked in this forward position until the totalizers are disengaged by means of a lug 176 on a lever 174 entering a recess in the rack, the lever 174 being connected at its rear end to the trip lever 142 by means of a .spring. The cams 170 are arranged in staggered relation on the shaft 172. The coupling mechanism between the slides R50 and the actuating racks to permit the relative movement comprises a bar 184, Figs. 5, 5c with pins 186, 188, 190 engaging a hole in the slide R50 and slots in the, rack 40 respectively. A spring connects the pin 190 to a pin 20 in a slot in the bar 184 and a lever 202 is pivoted to the bar 184. The lever 202 has projections 204, 208 engaging respectively a recess in the rack and a plate 214, Fig. 15, secured to the underside, of a shaft 212. The shaft carries an arm 218 having a roller engaging a cam on the shaft 172 so that when the shaft is actuated the plate 214 engages the projection 208 to free the other projection from the actuating rack. The totalizer is disengaged by means of a slide operated by a cam on the shaft 172 and carrying a block 224, Fig. 3, for engaging the end of one of the locking levers 114 so as to free them from the notches in the arms 100. The transfer parts are restored by means of the slide 233, Fig. 16, which engages a rod 232 on arms 230 secured to the shaft 158. The rod 232 striking the drop ends 228 of the carrying arms 152 causes them to swing on their pivots and permits the trip levers to assume their normal position. At the same time a rod 236 on the arms 234 engages the levers 174 to disengage the lugs from the recess in the racks 42, the racks thereupon returning to normal position. The shaft 172 is not rotated until the racks have been moved back to normal position during the calculation, the action being delayed by a retarding device comprising springs 255 and a dash-pot 257, Fig. 2. The rack 243, Fig. 17, is connected to an arm 246 loose on the main shaft and having a projection engaging an ar