Patent GB-261330-A (GB)
Title: Improvements in type-printing telegraphy
IPC: H04L17/22
Filed: 1926-03-17
Abstract: 261,330. Morkrum-Kleinschmidt Corporation, (Assignees of Kleinschmidt, E. E.). Nov. 11, 1925, [Convention date]. Type-printing telegraphs. - In a platen - shiit arrangement employing a shift control signal condition added to each code combination of selecting conditions as in Specifications 220,280 and 235,576, an anvil supporting the tape at the impression point is moved from shift to unshift position or vice versa by the longitudinal movement of an actuating bar. In one arrangement, Fig. 1, a member 420 carrying the anvil is operated through a bell crank 511 by an unshift actuating bar 516 against a returning spring 513. In the normal unshift position shown a projection 514 on the bell-crank is engaged by the end of a spring latch 508 pivoted to the shift control bar 503 and provided with an extension 509 engaging au edge of the bar. Upon receipt of a signal combination including a shift impulse, the shift-control selector bar 501 is moved and the bar 503 is then free to be turned about its pivot 504 by a spring 505 to disengage the latch 508 from the projection 514 whereupon the spring 513 moves the anvil to shift position in readiness for the printing operation. During the return movement of the pointer bail a member 128 thereon acts on the upper end of the bar 516, thus moving the bar longitudinally and effecting the return of the anvil to unshift position. During this operation the latch 508 first engages the edge of the projection 514 and is therefore moved by its spring into the locking position shown. In another modification, Fig. 2, the member 420 is held in unshift position by a spring 524 and is moved to shift position bv a cam 433 on shift-actuating bar 108 when this bar. having been selected by the movement of bar 501, is moved longitudinally upwards by the pointer bail in its pointing stroke. Fig. 3 shows a modification in which the bar moved longitudinally to effect the shift is the plunger 528 of a solenoid 529 energized by the receipt of a shift impulse over a contact. 1 of a of which the other contacts 2 - - 6 are connected to corresponding magnets for operation of the selectorbars 59 - - 63. The + shift impulse energizes the solenoid over leads 530, 534 and contacts 539, 540 and simultaneously energizes a magnet 535 of which the armature 537 closes a locking circuit for the solenoid. This locking circuit is opened at the contacts 539. 540 at the end of the printing stroke by the action of the member 128 on the pointer bail on the end 544 of a lever 542, and the anvil is thereupon moved to unshift position by the spring 527. By the provision of an inductive resistance across the leads 530 and 534 the de-energizing of the magnet 535 may be retarded sufficiently to enable the anvil to remain in the shifted position until the distributor brush reaches the next contact 1, thus eliminating unnecessary shift operations. In a further modifcation, at each selection of a type bar. either a shift-actuating bar or an unshift-actuating bar is selected, according to whether the shift control selector bar 501. Figs 1 and 2, is or is not operated by a received shift impulse, and the bar so selected is subsequently moved longitudinally upwards by the pointer bail in its printing stroke to effect the shift or unshift movement by the' action of its cam similar to that of the cam 433, Fig. 2.