Patent GB-545317-A (GB)
Title: Printing telegraph apparatus
IPC: H04L13/18
Filed: 1941-06-06
Abstract: 545,317. Type-printing telegraphy. CREED & CO., Ltd. June 6, 1941, No. 7175. Convention date, June 18, 1940. [Class 40 (iii)] [Also in Group XVI] Type-wheel machines and hammer-impression arrangements.-In a page-printing telegraph, a type-wheel provided with a number of rings of individually movable types is rotatable and movable axially for type-selection, and is traversable parallel to the axis of the platen for letterspacing. In the machine shown in the Figure, a type-wheel 124 is secured to a shaft 109 which is mounted in a carriage 101 running on rods 198, 199 supported by the framework. The upper part of the shaft 109 passes through a bushing 111 on the carriage, and the middle part is square and engages an opening in a sleeve which rotates in a bushing 106 on the carriage and is provided with a gear 103. The shaft 109 is depressed by a spring 114 and is provided with a threaded sleeve 116 carrying nuts 117 which normally abut on the bushing 106. A gear 102 engaging the gear 103, is secured to a shaft 97 which is mounted in bushings 98 on the carriage 101 and is connected to a shaft 72, mounted an the framework, by means of universal joints 87, 83 and square telescopic-parts 86, 82. The arrangement causes the shaft 109 to be driven at the same speed as the shaft 72, whilst permitting movement of the carriage. The shaft 72 is provided with a stop-arm 71 which co-operates with stop-bars 69 controlled by code-discs 66 forming part of the selecting-mechanism described in Specification 544,988. The type-wheel consists of a double-walled ring 127 having radially-arranged slots receiving upper and lower rings of types 128 formed with dots engaging spring-garters. The selected type is forced towards the platen 178 by means of a hammer depending from the top of an arm 253 mounted on the rod 199 and formed with a fork 253 engaging a bail 252 carried by the rod and operated once per cycle by a cam. The operating-connections include a floating lever normally pivoting on an abutment constituted by a bell-crank. When certain signals are received, the bell-crank is displaced and latched, the floating-lever is released, and operation of the hammer is prevented. Aligning for impression.-An aligning-dog 193 on a spring-urged bell-crank 182 engages a toothed wheel 192 on the shaft 109 when a camcontrolled bar 186 rises. Case-shift mechanism.-To bring the lower ring of types into the printing line, the type-wheel 124 is raised by means of a spring-operated vertically-movable bar 166 controlled by a cam. A bracket 164 on the bar co-aperates with a hook 163 on a slide 152 which is reciprocated by a spring 154 and a cam-operated bell-crank 159. A lug 151 on the slide co-operates with stops 148, 149 on a lever 142 which is rocked in one direction or the other when the shift or unshift signal is received. Normally, the lug ca-operates with the stop 148, the hook 163 obstructs the bracket 164, and the bar 166 is prevented from raising the shaft 109. When the shift signal is received, the lug co-operates with the stop 149, the hook releases the bracket, and the bar raises the shaft and type-wheels. The type-wheel is latched in upper position by co-operation of a finger 179 on the aligner bell-crank 182 with a flange 118 on the sleeve 116. The type-wheel returns to normal position after each printing operation, and thus enhances visibility of the typed line. Letter-spacing mechanism; carriage-releasing arrangements.-The type-wheel carriage 101 is stepped towards the right for letter-spacing by co-operation of a pawl 204 thereon with a reciprocating rack 208. When the carriage-returning signal is received, a bar 211 releases the pawl and detent, and a spring returns the carriage. The rack 208 is reciprocated by means of a rockarm which is operated once per cycle by a cam. The operating-connections include a floating lever normally pivoting on an abutment constituted by a bell-crank. When the shift or unshift signal is received, the bell-crank is displaced and locked, the floating lever is released, and letter-spacing is prevented.