Patent GB-650669-A (GB)
Title: Printing telegraph apparatus of the start-stop type
IPC: H04L13/04
Filed: 1946-03-07
Abstract: 650,669. Printing-telegraph receivers. SOC. D'APPLICATIONS GENERALES D'ELECTRICITE ET DE MECANIQUE SAGEM. March 7, 1946, No. 7074. Convention date, March 13, 1945. [Class 100 (iv)] [Also in Group XL (b)] In a start-stop printing-telegraph transmitter and receiver apparatus (see Group XL (b)), having a translating mechanism comprising seeker members coacting with combining members and capable of movement to determine the character or symbol to be printed or the function to be performed, and a printing mechanism for actuating the operative seeker member to effect the printing of a character or symbol or the performance of the function, the received and transmitted messages may be distinguished by being printed in black and red respectively, the inking ribbon 220 having its upper half coloured black and its lower half coloured red. A bar 215, operated by the printing of any character, pulls down a lever 216 and raises the ribbon so that printing normally takes place from the upper half of the ribbon. A cam 221 on the transmitter shaft operates levers 222, 223, 224 to depress a lever 218 to lift the ribbon 220 so that for signals being transmitted printing in red takes place from the lower half of the ribbon. Case shift. The levers 154 carrying the types 155 are mounted in a plate member carried by a framework 257 which can occupy alternate positions. The seeker bars 145, 146 corresponding to " Figures " and " Letters " are connected to pivoted levers 273, 274 associated with fingers 271, 272 on an elongated disc member 270 rotatable so that a shaft 269 is capable of rotation to a limited extent in either direction according to the bar operated by the printer bail 144. The shaft carries fingers 267, 268 which in alternate position of the shaft 269 are arranged to be in the path of a pivoted pawl 264 so that the movement of the finger 267 or 268 engaging the pawl allows a cam 262 to be driven from the shaft 2. The impact of the pawl 274 against the respective other finger 267 or 268 disconnects from the shaft 2 the cam 262 which in its alternative positions and through levers 259, 260 determines the upper and lower position of the frame 257 and hence the " Figures " or " Letters " printing on the tape 156. Feed of printing strip. The printing strip 156, Fig. 7, is passed over a rubber wheel 303, a pivoted guide number 302 and a roller 301 driven from a ratchet 298 actuated by a pawl 297 rocked by the operation of the lever 216 controlled by a printing frame 215, Fig. 5. The rubber wheel 303 which is opposite the printing position, is rotated at a slower speed than the roller 301 and a milled knob 309 permits manual operation of the feeding mechanism. Character-counting mechanism. A shaft 319, Fig. 8, carrying a pointer 320 associated with a dial 321 and biassed in the clockwise direction by a spring 322 is driven from a shaft 313 by a pawl 317 and ratchet 318 and is held by a retaining pawl 323. After a predetermined number of characters an arm 342 on the shaft 319 engages a trigger 343 pivoted on an arm 344 carrying a hammer 346 which strikes a gong 347 when the arm has passed the trigger 343. Towards the end of a line the arm 342 engages a pivoted member 348 rotating a lever 349 which moves a bar 350 to the left and locks the keyboard against operation until the actuation of a carriage return key (not shown) which moves a rod 353 to rotate the member 348 thereby releasing the arm 342 and the shaft 319 to return to normal position under the action of the spring 322. The line-spacing signal operates a seeker 324 which through lever 326 rotates a pivoted plate 328 engaging a rod connected to the drawing pawl 317 so that the ratchet is not actuated. The carriage return signal operates a seeker 329 and lever 331 to rotate a pivoted plate 332 having inclined surfaces which disengage the pawls 317, 323 to allow the shaft to return to its normal position. The plate 332 is held in its operated position by a latch 336 carrying a finger 339 which is engaged by a pin 338 on an arm carried by the shaft 319 when the pointer 320 reaches its zero position. A manually-operated lever 354 may be utilized to disconnect the counting mechanism when the printer is utilized for printing on a band or tape and the ratchet 318 has a space 341 corresponding to a missing tooth so that the driving mechanism is rendered inoperative after a predetermined number of characters. The retaining pawl 323 is provided with a double tooth so that the gap 341 is bridged when necessary: Page-printing receiver. The printing roller 427, Fig. 10, is mounted in a carriage sliding on rods 390, 391 and provided with a rack 388 in mesh with a pinion 387 on a shaft 384 carrying a driving ratchet 383 and a coiled return spring 385. The operation of the printing bail 144 to print a character moves a rod 377 to rotate on arm 379 in a clockwise direction allowing a lever 380 to rock and bring a pawl 382 into driving position with the next tooth of the ratchet 383. When the bail 144 returns it drives lever 380 so that the pawl 382 rotates the ratchet 383 which is held by a retaining pawl 386 having two teeth arranged to bridge the gap 411 due to the omission of a driving tooth. When the seekers 145, 146 corresponding to " Figures " and " Letters " signals are operated, an arm 396 on a shaft 395 rotates a lever 397 engaging the tail of the pawl 382 when the pivoted lever 380 is rotated by its spring 381. If the carriage return signal is received the seeker 329 is engaged by the printing bail 144 and consequent rotation of a shaft 400 rocks a lever 401 having a sloping surface 402 which engages the tail of the retaining pawl 386 releasing the ratchet 383 and also disengaging the driving pawl 382 by means of the link 403. The lever 401 is latched in its raised position by a hook 404 rotated by a shaft under the action of a spring 405. During the return movement of the shaft 400 the lever 401 is retained by the hook 404 until a projection 406 on the carriage engages a finger 407 on the shaft 408 to rotate the hook 404 from its latching position so that the lever 401 is returned to its normal position by the rods 398, 399 and the lever 330 under the action of the return spring of the seeker 329. The return movement of the carriage is cushioned by the engagement of a stop 409 with a dash-pot 410.' When a seeker 324, operated by the reception of the line-spacing signal, is engaged by the bail 144 a rod 394 rotates the shaft 395 to prevent the operation of the character spacing pawl 382. Simultaneously a lever 412 brings the lower end of an arm 414 underneath the end of an arm 415 which, during its downward movement, pulls a rod 418 rocking levers 419, 420 so that a member 421 engaging a plate 422 extending across the carriage rocks an arm 424 carrying a pawl 425 engaging a ratchet wheel 426 on the shaft of the printing roller 427. During the downward movement of the arm 414 a projection 429 engages a fixed stop 429 rotating the arm 414 so that its lower end is disengaged from the arm 415. The rod 418 ascends and the plate 422, returning under the action of a spring, rotates the shaft 423 to bring the pawl 425 into engagement with the next tooth on the ratchet 426. Inking-ribbon feed mechanism. The inking ribbon 220, Fig. 12, has its ends secured to reels 453, 454 driven by one of the ratchets 449, 450 actuated by a corresponding pawl 445, 446 carried by levers 440, 442 rocked by an arm 438 controlled by the printing bail 144. When, for example, the ribbon 220 has been entirely wound on the reel 453 the pivoted arm 471 rotates a finger 469 so that its end is opposite a pivoted member 463 which is rocked when the arm 438 is actuated so that the lever 457 is moved to the left disengaging the pawl 445 from its ratchet 449 and allowing the pawl 446 to drive the ratchet 450 until the completed reel 454 operates the finger 470 so that the member 464 is rocked to transfer the drive to the ratchet 449. The bar 457 is retained in its displaced position by having a projection engaged by a jockey roller 460.