Patent GB-265122-A (GB)
Abstract: 265,122,. Burroughs Adding Machine Co., (Assignees of Horton, A. A.). Jan. 29, 1926, [Convention date]. Adding and subtracting apparatus.- In a machine having an operating mechanism connected to a driving mechanism such as a handle or electric motor, means are provided for automatically disconnecting the operating mechanism from the driving means when attempt is made to operate when this is not properly conditioned for operation. Improvements are also described in connection with dash pots, full stroke devices, repeat keys, and control keys. The frames of the various mechanisms and the manner in which they are assembled are described in Specification 265,152. Dash-pots. - The main operating cam plate 74, Fig. 5, is connected to a yoke-shaped member 143 by a link 144 and the rear arm of the said member carries a rod 146 through which projects the piston 149 of the dash-pot 147 the piston being connected to the rod by a U-shaped member 150. Full-stroke mechanism.-The drive shall 71 is connected to a full-stroke sector 76 bv a disconnectible means. The sector 76 co-operates with a pawl 153 and has pivoted thereto one link 154 of a toggle lock to hold the sector against movement until the operating mechanism which is resiliently connected thereto reaches the end of its full stroke to break the toggle. The other link 155 of the toggle which is pivoted to the side plate 51 is slotted at its other end and engages the pivot pin 157. A spring 156 normally tends to move the toggle to locked position but is held unlocked by a projection 156 on the link 154 engaging the edge of the sector 76. The restoring cam 73 of the operating mechanism carries a pin 79 which at the end of the movement breaks the toggle to permit a return movement of the sector. Disabling mechanism. To prevent mis-operation of the machine when an amount key is only partially depressed or when the amount key and the total or sub-total key are depressed the operating mechanism is rendered ineffective the handle or motor performing an idle stroke. To the drive shaft 71 is secured an arm 89, Fig. 3A having a nose 87 engaging a pawl 83 connected with the full-stroke sector 76. Also connected to the sector on its opposite side is a pawl having a nose engaged by the shoulder of a lever connected to the driving motor. A safety control rod 191 journaled on a cross rod 122 is normally urged rearwardly and an arm 192 on the rod 122 has a pin 194 engaging a cam-slot 210 in one arm of a pivoted lever 211 the other arm of which has a projection 212 normally in' the path of a shoulder 215 on each of the pawls carried by the sector 76. Unless the projection is withdrawn when the machine starts to operate the driving mechanism will be disconnected. If an amount key is only partially depressed the corresponding latch plate is prevented from moving forwardly its full extent and the zero stop lever associated therewith as described in Specification 265,136, is almost in engagement with the rod 191 so that when the rod 191 is moved, on an operation, it immediately engages the zero stop lever and arrests movement of the pin 194 before it reaches the operative part of the cam-slot to effect withdrawal of the projection 212. As the parts are returned to normal position a slide 201 swings the rod 191 beyond its normal position to unlatch the keys. During adding and subtracting operations the movement of the rod, 191 is transmitted to a. link 453 the rear end of which moves idly over the lower flange of a bail 451. If the total or subtotal key is depressed the link 453 is lowered, so that its end engages the lower flange to arrest the movement of the, rod 191 and thereby disconnect the operating mechanism, the bail 451 being rocked until an upper flange thereon engages a shoulder on the latch plate holding an amount key in depressed position. When the machine is operating means are provided to prevent movement of the control lever 226 for addition and subtraction and if this lever should be carelessly positioned an arm thereon is moved into the path of the rod 191 to arrest its movement and disconnect the driving means. The Specification as open to inspection under Sect. 91 (3) (a) comprises also improvements in connection with the following:- Operating by motors.-This mechanism forms the subject-matter of Specification 265,135. Keyboards. - This mechanism forms the subject-matter of Specification 265,136. Differential mechanism. - This mechanism forms the subject-matter of Specification 265,137. With printing mechanism. - This mechanism forms the subject-matter of Specification 265,140. Line-spacing mechanism; ink-ribbon mechanism.-This subject-matter is decribed in Specification 263,097, [Class 100 (iv), Typewriters &c.]. Adjusting for computing or printing only.-The means for disabling the recording mechanism is described in Specification 265,140. The mechanism for throwing the totalizer pinions 236 of one form of totalizer unit into and out of engagement with the actuating segments 235 is described in Specification 265,134. This mechanism includes a pitman 387, Fig. 11, carrying pawls 393 and 404 co-operating with pins 395, 200 on the operating cam plate 74. Depression of a non-add key NA through a projection 445 on an arm 370 rocks the pawl 393 to prevent engagement with the pin 935 so that the pitman is not reciprocated. This subject-matter does not appear in the Specification as accepted. Multiplynig and dividing by repetition. - A bank of control keys includes a repeat key R which on being depressed prevents movement of a lever 231, Fig. 11, so that roller 231a thereon engaging the upper surface of a slide 201 reciprocated by the main operating mechanism as described in Specification 265,135 prevents the rocking movement of said slide so that on its return movement it does not engage a roller on the safety control rod 191 which remains stationary. Forward movement of the rod 191 is effective to release the depressed keys. With several totalizers.- A form of totalizer unit with associated transfer mechanism for effecting addition and subtraction together with control mechanism for conditioning the machine is described in Specification 265,134. A modification of the control means is shown in Fig. 11A wherein the lever 362 connected to the control lever 226 engages a pin on a single-armed lever 439<b> that is connected to the plate 436<b> and provides a positive actuation for the parts conditioning the transfer-mechanism for addition or subtraction. Another form of unit comprising two totalizers is shown in Figs. 31, 34, and 38, being mounted on frames 377U, 377L, pivoted to side plates 55. Each totalizer is associated with a transfer mechanism comprising a transfer actuaating segment 413L, a trip pawl 420L, and a transfer pawl 422L. The totalizer pinions are either in engagement with the transfer segments or the main actuating segments 235. When the pinions are moved into engagement with the segments 235 the pawls 422L are moved therewith and when a pinion passes from the 9 to 0 position the corresponding pawl is rocked and a shoulder 424L thereon is engaged by a latch 426 L. On the totalizer being moved out of engagement the upper end of the. pawl engages the trip lever 4201. and moves it to cause a shoulder thereon to move out of the path of a lug 419L on the transfer segment thereby permitting the segment to move until the lug meets a second shoulder and thus advances the next higher pinion one step. During the step movement of the transfer segments the lugs 419L thereon engage the latches 426L to free the transfer pawls 422L which return to normal position. The segments are restored on the succeeding operation by a cross bar 430L on arms 429L oscillating by means connected with the pitman 387. The pivot of the arms 429L carries a yoke member 884L and a cam 382I, engaging a roller on the totalizer frame 377L for throwing the pinions into and out of engagement with the segments. Either or both of the totalizers may be brought into engagement by means of a control mechanism which comprises two V-shaped levers 464, 465, Fig. 38, pivoted at 398 to the pitman. The levers 464, 465, have long arms with hooked ends for engagement with pins 466L, 466U on the yoke members 384L, 384U so that these members are rocked when the pins are engaged by the hooked ends on the reciprocation of the pitman. The V-levers are selectively controlled by a lever 226 connected by a link 363 to a three-armed lever 468 having a stud 469 projecting between the short arms of the V-lever which are spring-connected. When the lever 226 is in its forward position the stud 469 holds the V-lever 465 inoperative, in the rear position the V-lever 464 is held inoperative, and in the mid position both V-levers are rendered operative. Printing totals and sub-totals.-This mechanism is described in Specification 265,134. A modification of the mechanism for a totalizer unit as described above is provided so that if the control lever is in its mid position only the total or sub-total standing on the lower totalizer is printed. This is ensured on depression of the totals key or sub-totals key by the levers 367 or 365 rocking a lever 472 so that a projection thereon engages a roller 473 of a lever 474 and rocks the lever to render the V-lever 465 inoperative. Distinguishing marks. - To distinguish " totals," " subtotals," " non-add " and " subtracton " items a special character type bar is provided and is cornected to a segment 351. Fig. 25. Movement of the segment is cushioned as described in Specification 265,137 and is controlled by a stepped lever 358 a shoulder A on which normally prevents movement of the segment through engagement with the projection 360 on the arm 354 to which the segment is connected. Depression of the totals or sub-totals keys rocks levers 367, 365 which in their movement engage a projection 366 on the le