GB380125A - Improvements in or relating to telegraph receiving apparatus - Google Patents

Abstract

380,125. Type-printing telegraphy. CREED & CO., Ltd., Telegraph House, Croydon, Surrey.-(Teletype Corporation ; 1400, Wrightwood Avenue, Chicago, U.S.A.) June 11, 1931, No. 16982. [Class 40 (iii).] In a type-printing or like receiver (1) the armature of the receiving magnet, or a member co-operating therewith, is regularly reciprocated once per signal element so that the magnet can hold it without having to move it; and (2) a start-stop release device is so arranged that the effective portion of the signal can be selected by adjustment of the starting point. Receiver magnet with mechanically reciprocated armature. Fig. 1 shows a selector mechanism of sword-and-T type in which the sword 10 is set to one or other position by the member 29 which is pivoted at 30 and is integral with the armature 28. The receiver magnet 22 has merely to hold the armature 28 and not to move it, since during every signal element this armature is reciprocated by cam teeth 50 engaging a point 51 on the member 29. The cam teeth 50 are on the same shaft as the five cams 21 which reciprocate the sword 10 through levers 13. Modification using polarized relay. In a modification, Fig. 5 (not shown), a polarized armature separate from the part 29 acts as a. detent so that in the marking position it holds the part 29 against the spring 34, but in the spacing position not. The polarized armature cannot .pass from the free to the holding position till the part 29 has been moved to its marking position by a cam tooth 50. Start-stop release mechanism. A friction clutch, Fig. 2 (not shown), tends to rotate the cam shaft 18, but a stop-arm 66. on this shaft is engaged, in the stop position, by a gate 67 pivoted at 69 ; and the gate is prevented by a latch 70 from rotating counterclockwise under the pressure of the arm. The start signal, which is of a spacing nature, releases armature 28 and permits a head 88 carried thereby, Figs. 1 and 4, to act through a pushpin 86 and bell crank 84 to tilt the latch 70 and release the arm 68 which is integral with 67. The stop signal, which is of a marking nature, allows the latch 70 to be returned by a spring to the stop position shown, a sixth cam tooth 50 being provided for this purpose. Adjustment of effective point in received signal. The effective point in the received signals is determined by the timing of the cams 21, Fig. 1. In order that this may be adjustable, the pivot 69 and latch 70 are mounted on an adjusting plate 76 which by means of the knob can be adjusted angularly about the cam shaft 18, so that the cams 21 may start nearer to or further from their operating point 51, as required.