Patent GB-669844-A (GB)
Title: Improvements in or relating to telegraphic tape-recording apparatus
IPC: H04L17/20
Filed: 1949-03-11
Abstract: 669,844. Type-printing telegraphy. TELETYPE CORPORATION. March 11, 1949 [March 18, 1948; March 18, 1948], Nos. 6724/49 and 6725/49. Class 40 (iii). [Also in Group VIII] In a telegraphic recording apparatus utilizing a plurality of punches which are selectively operated to produce a perforated tape record of the telegraph signals, the punches are mounted to be yieldable in the direction of motion of the tape which can be advanced before the punches are withdrawn from the perforations. The punches may be mounted by means of springs in a fixed punch block, or they may be resiliently mounted in a pivoted punch block so that the tape can be advanced as it is being punched as well as during the time the punches are being withdrawn from the perforations. In the stop position of the selector cam sleeve 17 a recess 44 of a cam 42 is opposite a projection on clutch control lever coupled by pins 38, 39 to a lever 34 which is blocked by the end of the armature 28 when current is on the line. In response to the start impulse the armature 28 assisted by a biasing spring 29 allows the lever 34 to move forward and operate lever 36 carrying a projection 41 controlling a clutch 18 which connects the cam sleeve 17 to the shaft 13. The armature 28 is temporarily locked after actuation to its marking or spacing position by levers 46, 47 provided with ledges 54, 55 and projections 52 associated with shaped cams 49 on the sleeve 17 and shaft 13. During the reception of the code elements of a signal, the marking elements operate armature 28 so that the appropriate selector levers, such as 65, move clockwise when the projection 69 engages the recess on the associated selector cam 25. Subsequent movement of an operated selector bar 65 moves a punch selector member such as 71, to the left and this movement is applied to punch interponents 81 ... 85, which are latched in their operated positions by a bail 87 operated by a cam 94 on the sleeve 17. A bail 56 having a projection 59 operated by a cam 60 on the sleeve 17 raises and releases the members 71 which return under the action of their springs 76 and free the selectors 61 ... 65 for response to the code elements of the next signal. A lever 118 subsequently actuated by a cam 108 on the sleeve 17 rotates a shaft 116 to operate a clutch 109 which permits a sleeve 113 carrying an eccentric 122 to be driven from the shaft 13. The eccentric is connected by a lever 123 to pivoted frame 126 coupled by a lever 128 to a toggle mechanism 107 comprising links 136, 137 attached to a shaft 132 mounted on a fixed pivot 133 and links 138, 139 carrying members 141 attached to a punchoperating frame 101 in which the slidable punch interponents 81 ... 85 are mounted. The ends 177 of the punch interponents are associated with recesses 178 in punch pins 144 floatingly mounted in open-faced slots in the punch block 142 and are biased by springs 149 to their normal vertical position. During the straightening action of the toggle 107, an arm 169 rotates anticlockwise and moves a feedpawl 167 idly downward over the teeth of the ratchet 161 which is held against movement by a jockey roller on a spring-biased arm 172. During the downward movement of the frame 101 when the toggle 107 is being returned to its unstraightened position, the pawl 167 is pushed upward to rotate the ratchet 161 and sprocketwheel 156 so that the tape is fed forward with the operated punch pins 144 still engaged in the perforations. During the downward movement of the frame 101, the ends 177 of the punch components 81 ... 85 in their left-hand or operated position engage the portions 181 on the corresponding pins 144 and effect their withdrawal from the tape 166. Subsequently the cam 94 raises the bail 87 to unlatch those interponents 81 ... 85 which have been operated. The feed-wheel 156 has teeth 157 co-operating with recesses 158 in a die-wheel 159 to provide feed-holes in the tape 166. In a modification, Figs. 6, 7, 8, the punch pins 144 are mounted in a block 241 secured to a pivoted frame 242 which is biased by springs attached to the pins. The block is pivoted on a shaft 243 and carries an arm 244 engaging a pin 247 on the punch operating frame 101. The punch interponents, such as 211, are normally retained in a right-hand position against the tension of springs 215 by latch portions 208 on punch selecting members 201 which, in response to marking signals, move to the left and are lifted by engagement of a pin 202 with an inclined slot 206 so that the corresponding punch interponent is released to move its end 177 into operating position with regard to the slot 178 in a punch pin. After the punching operation the interponents are returned to the right by a bail 228 carried by an arm 224 linked to a lever 219 which is moved to the right-hand position, as shown, by a high portion 217 on a cam on the sleeve 17. The tape is fed forward during the upward and downward movement of the bar 101 by two pivoted pawls 248, 249, shown in Fig. 7, respectively operating on the ratchet 252 on the shaft 155 of the feed-sprocket 156. Back-spacing arrangements. A plate 262, provided with a thumb-piece 263, and with slots 266, 267 embracing a fixed pin 264 and the shaft 155, carries a pivoted pawl 271 having an arm 277 linked by a spring 278 with an arm 279 carried by the plate 262 and a further arm 273 engaging an eccentric 276. The plate 262 carries a pin 268 connected by a spring 269 with the fixed pin 264 and an arm 281 which passes between the pawls 248, 249 of the feed ratchet 252. Downward movement of the plate 262 disengages the pawls 248, 249 and also rocks the pawl 271 into engagement with back-space ratchet 261 on the shaft 155 of the tape-feed mechanism. A flattener plate 282 with wedges 283 arranged in register with the apertures of the punch block 241 presses down the lidded apertures of the perforated tape to facilitate its passage between the punch block and the die position during the back-spacing operation. The plate 282 is operated from the plate 262 by a rod 291 supported within a spring 289 and is guided by pins 284, 287 associating the plate with the punch block. In a further modification, Fig. 15 (not shown), two cycles of operation are effected during each revolution of the cam sleeve 17 and of the shaft coupled to the eccentric controlling the upward movement of the punch frame. In this arrangement the toggle is arranged to pass through the straightened position to a second unstraightened position during each cycle and the cams are provided with additional elements, e.g. projections spaced at 180 degrees from those provided on the corresponding cams of Fig. 1. Punch pins of different shape, and arrangements for punching feed holes of different patterns in conjunction with appropriate die-wheels ar described in connection with Figs. 10 to 14 (not shown). Specification 556,700 is referred to.