Patent GB-235574-A (GB)
Title: Telegraph typewriters
IPC: H04L17/06
Filed: 1924-06-23
Abstract: 235,574. Kleinschmidt Electric Co., Inc., (Assignees of Kleinschmidt, E. E.). July 5, 1923, [Convention date]. Type-printing telegraphs.-A start-stop transmitter comprises a rotary shaft, means coacting with the shaft to transmit code combinations of electrical impulses, a. stop member arranged to arrest the shaft at the end of each code combination, means for moving the stop member to initiate the rotation prior to the transmission of each code combination, and means actuated by the rotating shaft during the transmission to return the stop member to a position in readiness to stop the shaft. The transmitter is applicable as part of the type-printing telegraph apparatus described in Specification 218,643. The depression of any key lever 399 moves a start bar 410 to the right and moves code bars 405 - - 409 to right and left in accordance with the code combination representing the character to be transmitted. The movement of the bar 410 pulls on a stop member 417 to release a disc 419 carried by a shaft 422 adapted to be driven through friction discs 427, 428 from a continuouslyrotated gear 429. Each bar 405 - - 409 is connected through springs 451, 452 to a corresponding lever 445 - - 449 pivoted at 450, and the movements of the bars to right or left thus actuate these levers to place cams into or out of the path of rotation of corresponding pins 440 - - 444 helically arranged on a shaft 435 driven from the disc 419 by a fork 439 engaging the pin 440. The shaft 435 is mounted for axial movement, its end 436 bears on a pivoted member 460 carrying a contact 461 co-operating with line contacts 462, 463, and a spring 464 normally holds the shaft in the position in which the contact 461 engages the contact 462. A V-shaped extension of each lever 445 - - 449 is adapted to be engaged according to the position of the lever by one or other of two V notches 455 in a corresponding locking arm 454 pivoted at 456 and controlled by a spring 458'. The arms 454 are normally held out of such engagement by a pin 457 on a lever 458 of which the free end is supported by a pin 459 on the disc 419. When this disc and the shaft 435 commence to rotate the pin 459 moves away to allow the lever 458 to fall, whereupon the springs 458<1> move the arms 454 to locking position. The pin 444 engages a fixed cam 453 to move the shaft 435 axially to transmit a starting impulse, and a pin 421 on the disc 419 shortly afterwards engages an arm 415 of a lever 413 pivoted on the bar 410 and moves the lever against the action of a spring 418 to disengage an arm 414 from a projection 416 on the stop member 417. This member is thereupon returned by a spring 420 to place it in readiness to stop the disc 419 at the end of one revolution. During the rotation of the shaft 435 the pins 440 - - 444 successively engage or fail to engage the cams on the corresponding levers 445 - - 449 to control the axial movements of the shaft thus sending the required sequence of impulses to line. If a succeeding key lever 399 is depressed before the shaft completes the revolution, the springs 451, 452 are stressed to enable the levers 445 - - 449 to take up positions corresponding to the succeeding code combination as soon as these levers are unlocked by the engagement of the pin 459 with the lever 458.