Patent GB-218643-A (GB)
Title: Telegraph typewriters
IPC: H04L17/22
Filed: 1924-06-23
Abstract: 218,643. Kleinschmidt Electric Co., Inc., (Assignees of Kleinschmidt, E. E.). July 5, 1923, [Convention date]. Type-lever machines; driving - mechanism.- In a type-printing telegraph, bars for actuating type-levers and spacing, shift, signal-bell, and other devices are controlled by slotted selector members and are driven by spring means adapted to move the selected actuating- bar through aligned slots in the selector members. The spring means may be tensioned by motordriven mechanism, the motor being associated with a centrifugal speedgovernor and a speed-indicator comprising a stroboscopic wheel. The telegraph may be provided with the start-sto}! transmitter described in Specification 235,574, [Class 40 (iii), Telegraphs, Electric], and be associated with the circuit arrangements described in Specification 235,575, [Class 40 (iii), Telegraphs, Electric]. The actuating-bars 108, Figs. 1 and 2, are are controlled bv the selector mechanism described in Specification 235,572 and comprising slotted selector bars 59 - - 63 controlled bv a receiving-magnet 8 which imparts axial movement. to a pin-shaft 15 operating fingers for positioning the selector bars. The actuating-bars engage pins 120 on levers 112, 113 pivoted on a segment 114, the levers 112 having pins engaging slots in type-levers 116 pivoted on a segment 117, and the. levers 113 being connected to spacing and other mechanisms described below. The pins 120 are arranged in alignment, and to equalize the stroke of the type levers, the segment 114 is curved in the reverse direction to the segment 117. A universal operating-bail 126 for the bars 108 comprises cross-bars 125, 131 secured to arms on a rock-shaft 129 having a depending arm to which is connected a spring 133, Fig. 1. The spring is connected at the rear to a bar 134 which can be moved to the front or rear to adjust the tension and is secured by a pin 140 engaging one of a series of holes. A controlling-cam 91 for the shaft 129 engages a roller 147 on an arm which is pivoted on a block 143 on the shaft and abuts on a spring secured to the block. If the action is obstructed, the spring yields and prevents breakage of the parts. The cam is secured to a loose sleeve 88 on a shaft 29 driven continuously from the motor shaft 105 by gearing 103, 104. The sleeve is clutched to the shaft by the action of an arm 87 on a spindle 79 controlled by the selector bars, the sleeve rotating until a cam 90 acting on an arm 85 restores the spindle and places the arm 87 in position to de-clutch the sleeve. When the selector bars have been set by a received signal, the spindle 79 rocks and the sleeve 88 is coupled to the shaft 29, the cam 91 thereupon permitting the spring 133 to rock the shaft 129 and move forward the bail 126. The bar 125 then moves away from projections 110 on the bars 108 and permits the selected bar to drop into the aligned notches of the selector bars, and on further movement of the bail, the bar 131 engages a notch 111 in the selected actuating-bar, and the associated type-lever or other device is operated. The cam 91 then moves the bail rearwards and re-tensions the spring 133. The typelever, aided by a spring 123, returns with the selected actuating-bar, and the bar 125 engages the projections 110 and raises the actuating-bars to the normal position. The bail is controlled throughout the backward and forward movements by the cam 91, the cam being so shaped as to allow the maximum tube for the forward or impression stroke. The following devices are provided for regulating and indicating the speed of the driving-motor :-An armature resistance is normally short-circuited by contacts 471, 472, Fig. 37, the contact 472 being adjusted by turning a knob 482, and the contacts 471 being adjusted by a centrifugal device on the motor shaft 105. The contact 472 is carried by a screw 473 mounted in a nut 474 and geared to the spindle 481 of the knob. The centrifugal device consists of a flat spring 466 provided with weights 467 and having slots engaging studs on a disc 465 on the motor shaft, a member 468 on the spring engaging a spring-urged lever 470 carrying the contact 471. When the speed of the motor increases, the spring 466 is flexed by the action of the weights, the contact 471 separates from the contact 472, and resistance is inserted in the armature circuit to reduce the speed of the motor, the average speed being determined by adjusting the contact 472. To indicate when the motor is running at the proper speed, the shaft 29 is provided with a stroboscopic wheel 485 over which are arranged plates 484 carried by a tuning-fork 483. The stroboscopic wheel has three circumferential rows of black spaces which are of uniform width but are arranged at different intervals in the three rows. The centre row appears to be at rest when the motor is running at the correct speed, and so long as the speed is within the permissible range the two outer rows appear to run in opposite directions. A hammer 486 for the tuning-fork is operated by a push-button 488. Paper-carriages; paper feeding and guiding arrangements.-A carriage 232, Figs. 1 and 2, supporting a platen roller 231, is provided at the front with rollers 242 running on a rail 244, and is secured at the rear to a rack 235 running on a ball 236 on a stationary bar 237. The rack is held down by a roller 240 on a spring 241 secured to the bar 237. A dust-guard 239 is secured to the bar 237. The rack engages a pinion 182 on a shaft 183 associated with the letter-spacing, tabulating, and carriage-returning mechanisms described in Specification 235,573. The balls 236 are constrained to move at half the speed of the carriage by a rack 238 engaging a pinion 181. Feed-rollers co-operating with the platen roller 231 are supported by spring-urged arms on the carriage, release of the feed-rollers being effected by a square rock-shaft engaging recesses in the arms. The front feed-rollers are geared to the platen roller. A paper-apron 310 is provided with a guide-rod 311 for the paper. A pressing- plate 313, Fig. 1, is carried by rock-arms 315, 316 and is provided with arms 318 carrying feedrollers 317. The plate 313 is retained in normal position by means of springs engaging the arms 315, the springs having humps for engaging the corners of the arms to retain the plate when released. Carriage-shift mechanism.-The rail 224, Fig. 2, on which the carriage 232 runs is secured to arms 245, 246, Fig. 23, on a rock shaft 247, one of the arms carrying a pivoted hook which normally engages a ledge on the stationary race 237. The hook is connected by a link 254 and bell-crank 255 to a bar 257 suspended by a slotted link 258 from one of the actuating-bars 108. A spring 260 normally holds the bar 257 in raised position. When the shift signal is received, the actuating-bar drops on the forward stroke of the ball and causes a notch 264 in the bar 257 to enter the path of a member 263 on the bail. On return of the bail, the cam 91 forces the bar 257 to the rear so that the hook is released, and the rail 244 is then raised to shift the carriage. The carriage is locked in the shifted position by means of a pivoted latch 267, Fig. 23, adapted to engage an arm 265 on the shaft 247. The latch is released by means of an actuating-bar 108 controlled by the un-shift signal. Adjustable stops 270 limit the movements of the arm 265, and a stop 275 determines the normal position of the actuating- bar 108. For controlling a special operation, such as ringing a bell or starting a motor, contacts 394, 395, Fig. 34, are adapted when the carriage is locked in the shift position to be closed by one of the actuating-bars 108, preferably that for operating the " J type-lever. The contacts are mounted on an arm 392 secured to the shift-locking arm 265, the contact 395 having a block 397 normally out of the path of an extension 391 on a rocking arm 390 connected to the actuating-bar 108 for the " J " type-lever. When the carriage is locked in the shift position, the block 391 is in the path of the extension, and if the " J " signal is received, the arm 390 rocks and the contacts are closed. Effective operation of the "J" type-lever and the spacing-mechanism is prevented by engagement of the extension 391 with a stop 393 on the arm 392. Alarms.-A signal-bell hammer 382, Fig. 1, is operated by an actuating-bar 108, Fig. 32, which is controlled by the blank signal or no-impulse combination or by opening the line, and is adapted to lock the selector bars When the selector bars are in normal position, the actuating-bar enters aligned slots 386 therein, and the bell is rung at each revolution of the cam 91. When however any of the selector bars are displaced, the actuating-bar enters the slots 386, and notches 387 in the undisplaced and displaced selector bars respectively and locks all the selector bars until the selective operation is completed. Line-spacing mechanism.-A bar 276, Fig. 2, controlled by a line-feed signal in the same manner as the above-described shift-bar 257, rocks an arm 277 on a shaft 278 connected to a link 281 having a roller 283 which engages a plate 284 secured to a rock-shaft 285 on the carriage. An arm on the rock-shaft carries a pawl 287, Fig. 1, co-operating with a ratchet-wheel on the platen roller. To avoid tilting of the carriage, the roller 283 is arranged vertically beneath the balls 236. Pins 297, 298, limit the movement of the pawl. For operating the line-spacing mechanism automatically when the carriage is returned, the actuating-bar controlling the carriage-returning mechanism described in the above-mentioned Specification 235,573, may operate a bar arranged in the same manner as the bar 276 and connected to the shaft 278. Ink-ribbon mechanism. - (1) Feed and automatic reversal. The spools are carried by shafts 225, Fig. 19, provided with ratchet-wheels 223, 224 co-operating alternately with feed-pawls 216, 21