Patent GB-849430-A (GB)
Title: Improvements in or relating to type printing telegraph apparatus
IPC: H04L17/28
Filed: 1958-05-01
Abstract: 849,430. Type printing telegraphy. HANDLEY, J. April 24, 1959 [May 1, 1958; July 12, 1958], Nos. 3852/58 and 22423/58. Class 40(3). [Also in Group XVI] A type printing telegraph apparatus of the type in which the printed characters are made up in a mosaic form comprises a disc for each character, means for selecting the disc corresponding to the incoming signal, and means consequent on movement of the selected disc to select impression forming sections to print the character. The apparatus described uses a six element code and accommodates fifty-five characters. In a first embodiment, Fig. 1, code bars 7-12 are moved under the action of relay 1-6, only one shown. The fifty-five discs 25, one shown, carry an arm 71 and are freely mounted on a shaft 72. Movement of the code bars on receipt of a telegraph signal causes six slots in the code bars to come into line beneath the arm 71 of the appropriate disc 25. The arms are periodically raised and lowered under the action of a bar 74 and compression springs 69A, 73, the bar being moved by a cam 76 and rocker arm 75 system. As an arm drops into the aligned six slots the disc moves anti-clockwise causing a finned rocker arm 79, 78 to move an arcuate lever 80 which in turn moves a needle 81 of a hydraulic valve. This valve, Fig. 2 (not shown), sets up one impression forming section of the character to be printed. Thirty rocker arms 78 are used distributed about the circumference of the discs, and the finned portions 79 engage in slots in the discs, the slots being designed so that only the rockers required to operate the valves for a given character are moved by the relevant disc. A second embodiment, Fig. 3, and Figs. 4 and 5 (not shown), operates at twice the speed of the above apparatus while, by duplicating the selector mechanisms, the operating speed of these mechanisms is unchanged. In this embodiment successive signals are passed alternately to sets of relays which move code bars 7-12 and 19-24. Arms 71, 94 on disc 25 have fingers 95, 96 which may drop into aligned slots in the code bars when rockers 102, 103 move in the direction of arrows J, L respectively. Further rockers 104, 105 bear on fingers 95, 96 when they are in their slots, causing the disc 25 to move about shaft 72 and actuate rocker arms 78 which in turn actuate the mosaic-forming system as in the first embodiment. In an operating cycle of six periods, in the first and second periods code bars 19-24 are set, and a previously received character is printed by movement of rocker 104. Also in the second period rocker 104, and hence disc 25, return to rest. In the third period rocker 102 removes finger 95 from the slot, and rocker 103 allows finger 96 to enter the slot in the other set of code bars formed in the first period. Code bars 7-12 are set in the fourth and fifth periods and, also in the fourth period, rocker 105 causes the character set during the first period to be printed. In the fifth period rocker 105 and disc 25 return to rest and in the sixth period the reverse of the action of the third period occurs. The Provisional Specifications state that the rockers 78 may operate electrical instead of hydraulic means for setting the mosaic pattern and describe a means comprising a punched tape and photo-cells whose outputs trigger flip-flops which operate the code bar relays. Specification 789,742 is referred to.