Patent GB-547937-A (GB)
Title: Improved paper-feeding mechanism for printing telegraph apparatus
IPC: H04L13/06
Filed: 1941-07-04
Abstract: 547,937. Printing-telegraphs. CREED & CO., Ltd. July 4, 1941, No. 8455. Convention date, July 13, 1940. [Class 100 (iv)] Platen-rotation for blanking.- A printing-telegraph having a movable type - basket and a stationary paper-carrier is provided with means for initiating repeated line-spacing, and means, under control of a single hole or designation in the paper, for interrupting line-spacing at a point determined by the position of the hole. The printing- telegraph shown in Figs. 1 and 4 is controlled by start-stop mechanism of the kind described in U.S.A. Specification 1,904,164 and comprising a single line-magnet 11 which acts successively on selector-vanes 33 by means including an armature-lever 13, and swords 22. Bell-cranks 26 in connection with the swords are operated successively by a helical set of cams 25 frictionally coupled to a shaft 23 provided with a one-revolution clutch 140 which is controlled by an arm 40, and drives a cam for operating a bail 76. On receipt of a signal, a plunger 36 is depressed by the lever 13, a bell-crank 38 releases a latch 41 from a bail 46, an arm 49 thereon is released from an arm 51 on the cam-set 25, and the latter makes one revolution. A vertical-tabulating lever 55, selected by the vanes 33, co-operates with a bell-crank 64 having an arm 50 cooperating with a latch 68 and the clutch-arm 40, another arm 65 co-operating with the unshift push-bar and the line-spacing push-bar 66, and a third arm 84 co-operating with a bell-crank 88 which is coupled by a link 92 to a slidable yoke 94 having a finger 96 in engagement with the bellcrank 38. The push-bar 66 is coupled by a bell-crank 72 and link 77 to a bell-crank 78 carrying a pawl 81 which co-operates with a ratchet-wheel 82 on the platen 83. The latch 68 engages a link 98 having pivotal connection 99 with an arm 101 which is secured to a shaft 102, and abuts on a lug 104 on the link 77. An arm 108 on the shaft has a pin 113, engaging a pivoted plate 115 formed with a sheet-feeler 119, and an arm 126 co-operating with a latch 128 on a shaft 129 provided with a finger 133 which is arranged in the path of the bell-crank 78. Another arm 117 on the plate 115 co-operates with an arm 107 integral with the arm 108. The paper employed consists of a series of uniform blanks having printed headings. The paper has marginal perforations for engaging sprocket-pins 143 on the platen, and each blank is provided also with a controlhole which is in alignment with the bottom of the printed heading, and passes over a groove 121 in the platen. A link 135 is connected to the plate 115 and has a pin 136 abutting on a pivoted arm 124 provided with a paper-guide 122 having a guidenotch 123 for the feeler 119. On release of the feed-roller from the platen, a cam 137 depresses the link 135 and thereby depresses the feeler 119 and paper-guide 122 to facilitate threading of the paper around the platen. When the vertical-tabulating signal is received, the lever 64 raises the line-spacing push-bar 66 and the unshift.push-bar into the path of the bail 76, yoke 94 is moved, the latch 68 cooperates with the arm 50 to lock the lever, and the cam-set 25 and the operating-cam for the bail 76 are driven continuously. Thereupon, the platen is returned to lower-case position, and the linespacing pawl 81 is operated repeatedly. At each operation, the bell-crank 133 releases the latch 128, and the feeler 119 is spring-urged into contact with the sheet when the latter is stationary. If the feeler does not engage a control-hole, the arm 117 blocks the arm 107, and the shaft 102 is prevented from turning sufficiently to cause the link 98 to release the latch 68. On return of the link 77, the lug 104 lifts the arm 101, and the latch 128 re-engages the arm 126. When, however, the feeler engages a control-hole, the arm 117 is released from the arm 107, the shaft 102 is turned sufficiently to cause the link 98 to release the latch 68, the lever 64 returns to normal position, and line-spacing is interrupted. For suspending transmission during vertical-tabulating, the arm 84 is arranged to open a contact 86 and thereby de-energise the start-magnet 30 of the transmitter 70. To delay resumption of transmission until the slowest printer in the circuit has completed vertical-tabulation, the arm 84 is arranged to close a contact 233 and thereby de-energise a delayrelay 231. On completion of vertical-tabulation, the contacts 86, 233 are closed and opened, but energisation of the magnet 30 is delayed until the relay 231 closes its contact 232. In a modification, Fig. 6 (not shown), the paper passes between two plates having slots in register with a feeler on a first arm secured to a rock-shaft. A latch cooperating with the arm is released by means of a second arm on a second rock-shaft provided with a third arm in the path of a bell-crank carrying the line-spacing pawl. The first rock-shaft has a further arm engaging the bell-crank, and is coupled by a link, to the latch 68, Fig. 1. At each line-spacing operation, the feeler engages the paper, and when a control-hole is presented, said first arm makes an abnormal movement, and the latch 68 is released in the above-described manner. In the construction shown in Fig. 7, the paper 144 passes between a contact 209 and a feeler 211 arranged in the circuit of a magnet 213 having an armature 191 co-operating with a lever 187 which is rocked by the verticaltabulating lever 182. The lever 187 engages a pushbar 194 in connection with a bell-crank 198 which carries the line-spacing pawl 199 and co-operate with a bell-crank 218 for releasing a latch 215 from the feeler 211. The lever 187 controls a clutch in connection with a cam 207 for a push-bar operating- bail 208. When the lever 182 is selected, the lever 187 is latched by the armature 191, and the linespacing pawl and the feeler are operated repeatedly until the feeler engages a control-hole in the paper. Thereupon, the feeler engages the contact 209, the magnet 213 rocks the armatures 191, and linespacing is interrupted.