Patent GB-783869-A (GB)
Abstract: 783,869. Typewriters. BURROUGHS CORPORATION. Oct. 1, 1954, No. 28380/54. Class 100(4) [Also in Group XIX] A typewriter caculating machine is provided with a series of settable amount type. bars, in addition to the usual type actions, and operable alternatively to the type actions by the same set of numeral keys. The machine described comprises a conventional typewriter, Fig. 1, with a tabulating paper carriage C, and including settable pin-carriage calculating mechanism A operable from the numeral keys 67 of the typewriter keyboard. This calculating mechanism has its own settable digit type bars 149, Fig. 3, which function, in place of the normal type levers 73, during calculating operations. The carriage is provided with stops for automatic control of tabulation and machine functions, the sequence, of which can be changed by rotating a knob 55. The machine is adapted to requirements by manual adjustment of a function control lever 65 to one of three positions. In the upper or " adding " position ,key converting mechanism becomes effective to lock the keyboard against normal typewriting actuation and to render the numeral keys effective to enter items on the calculating mechanism. After entering an item, the machine is cycled by depressing a motor bar 46 and the platen is line spaced at the conclusion of the cycle. In the intermediate. or " posting " position, the keyboard is similarly conditioned for item entering, but the carriage tabulates and the machine functions automatically under control of the carriage stops. With the control lever in its lowermost position, the machine functions in the normal manner of a typewriter and with the calculating mechanism inoperative. Main operating and differential mechanisms. A main operating frame O, Fig. 10, is reciprocated longitudinally of the machine by cranks 174 on a motor driven shaft 168, each crank having a block 172 working in a vertical slot 170 in a cross-head 169 on each side plate of the frame. Individual springs 194, Fig. 12, connect a plate 176 on a cross-bar of the frame with differential slides 142 of the calculating mechanism and carry the slides forwardly until arrested by engagement of lugs 144 thereon with set pins of the pin carriage. A restoring bar 160 is mounted for longitudinal sliding movement on the frame, steps 457 on the frame carrying the bar with the frame during the forward stroke: Towards the end of the return stroke the restoring bars is arrested by stops 455, and springs 452 connecting the bar and frame are then tenioned as the frame completes its movement. The tension in the springs is released at the commencement of the forward stroke, whilst the steps 457 are coming up to the bar 160, and assists the motor is commencing the cycle of operation. Type bar setting: zero print suppression. The type bars 149, Figs. 3 and 12, are vertically adjusted by means of bell-cranks 153 held up to abutments 191 on the differential slides 142 by individual springs 179 which, like the springs 194 of the slides, connect them with a cross-bar 165 of the operating frame O. The bell-cranks are, however, retained by latches 187 during initial forward movement of the frame and slides, the type bars therefore remaining in their normal sub-zero position clear of the platen 58. The latches 187 are adapted to be tripped by their differential slides upon move ment beyond zero, so freeing the bellcranks and type bars for adjustment with their differential slides. Each latch 187 has a lug under-lying the latch on its left, so that all latches to the right of a tripped latch are also tripped. In this way zero prints are suppressed, but not in orders below the highest actuated. Key converting mechanism. This mechanism is under control of the carriage, as well as of the function control lever 65 as previously indicated. Engagement of a carriage stop 57, Fig. 15, with a lug 60 on a control lever 91, depresses the lever against a strong spring 96 and the lever 91, through a connecting linkage 98. 104, 106, releases a transverse bail 108 for forward movement by a spring 113. This movement of the bail relaxes a spring connection with a transverse rocker plate 115, Figs. 3 and 15, permitting the plate to assume the vertical position shown under-lying lugs 118 on the key levers. The plate 115 blocks the letter keys against movement but slots 117 permit sufficient movement of the numeral keys 67 to set the pin carriage of the calculating mechanism without carrying the type levers 73 to full strike position. Bifurcated fingers 125, see also Fig. 7, pivoted to bell-cranks 123 under-lying the numeral keys, are connected by light springs 126 with the bail 108; these fingers move forwardly with the bail and establish operative conection between the numeral keys and pull wires 129 which are connected at their rear ends to the indexing mechanism of the pin carriage 132. Movement of the bail 108 to effect the above change in key action is permitted only when the function control lever is in its " adding " or its "posting position; when in its lower position the bail is held by a hook (not shown) so that the keyboard remains conditioned for normal typewriting. Carriage tabulation. The carriage rack 300, Figs. 27 and 28, is pivotable upwardly relatively to the carriage and integral with a bar 299 engaged by a lever 296. The tabulating key 47 rocks the lever 296, so raising the rack clear of the escapement controlled pinion 302 of the letter spacing mechanism. A spring 306 connects the lever 296 with its spindle 287 so that an arm 308 on the spindle simultaneously raises the tabulation pawl 61, Fig. 29, which latches in the raised position, by engagement of its enlarged head over the carriage control plate 59, so maintaining the rack 300 raised. When the next carriage stop 57 strikes the pawl 61, it unlatches the pawl so releasing the carriage rack 300 and permitting springs 322 to re-engage it with the letter spacing pinion 302. The connection of the tabulating key 47 with the lever 296 includes a lever 290, Fig. 27, formed with a cam tip 327 adapted to be engaged by an abutment 328 on the cyclic operating frame. During forward movement of the operating frame the abutment 328 cams the lever 290 laterally on its pivot 291, without otherwise operating the lever, whilst on the return movement the lever 290 is rocked counter-clockwise to release the carriage for tabular movement as above described. This automatic tabulation is prevented when the function control lever is moved to its upper or " adding " position. A pull wire 335 operated by the control lever rocks a bellcrank 339 and a lug 342 thereon cants the lever 290 laterally to prevent its actuation by the abutment 328 of the operating frame. The lever 290 is, however, still actuable by the key 47 so that manual tabulation is not prevented. Typewriter action; impression mechanism. A rod 69, Fig. 3, connects each key lever 67 to a link 70 connected by a drawbar 72 to the heel of the corresponding type lever 73. The impression hammer 44 for the calculating type bars 149, which incorporates the guide 43 for the type levers 73, is supported between a pair of centrally pivoted levers 199, Figs. 3, 7 and 12, actuated by a spring 200 under control of a pair of cams 202 on the main shaft 168. The hammer is initially drawn forwardly by the cams to clear the type bars 149; at the half cycle position drops in the cams release the levers for impression movement and the hammer is drawn forwardly again clear of the type bars before being finally returned to normal above the restored type bars. Ribbon vibrator. During typewriting, the key actuated links 70 rock a universal bar 80, Fig. 3, which, through pull rods 81, 83, rocks bell-cranks 84 adapted to raise the usual ribbon vibrator (not shown). In calculating operations, the ribbon vibrator is actuated only by cyclic movement of the operating frame O, preceding key action being ineffective due to the Key blocking plate 115. The operating frame releases a bar 258, Fig. 10, for forward movement under spring action, and the bar rocks a shaft 262 whose cranked end 266, Fig. 3, actuates the pull rod 81 and ribbon vibrator. Ribbon wind. Conventional mechanism operated by the movement of the carriage is employed to wind-on the ribbon during typewriting. In calculating operations, the carriage is stationary and ribbon wind is effected by cyclic movement of the operating frame. Line spacing. The carriage platen is manually operable for line spacing in the usual manner of typewriters. During calculating operations, the carriage being stationary, line spacing is accomplished by the operating frame under control of the carriage stops. A pawl 386, Fig. 19, coacts with a ratchet wheel 387 on the platen spindle and is carried by a throw link 385 pivoted to a frame 382 pivoted at 381. A lower rod 383 of the frame bears against a stud 380 on an arm 379 on a vertical spindle 370, Fig. 23, carrying an arm 369 at its lower end, the arm bearing against an upstanding lug 378 of the operating frame under the action of a spring 388 connected to the throw link. As the operating frame and lug 378 move forwardly during the first half cycle, the arm 369 follows (counterclockwise, Fig. 23) and the pawl 386 advances over the ratchet wheel 387. During the second half cycle, the returning lug 378 restores the arm 369 and pawl 386 to step feed the platen. A lip 365 of a pivoted detent 63, Fig. 23, obstructs a stud 368 on the arm 369 to prevent the above described line spacing action except when the detent is depressed by one of the carriage stops. Front feed bail. The movement of the frame 382 is utilized to engage a locking catch with the front feed bail 392, 393, Fig. 19, of the carriage during cyclic operation of the machine. During operations which do not involve line-spacing, a restricted movement of the frame occurs suffi