Patent GB-264907-A (GB)
Title: Improvements in or relating to telegraphic transmitting and tape perforating apparatus
IPC: H04L17/04
Filed: 1925-10-22
Abstract: 264,907. Creed & Co., Ltd, Creed, F. G., and Salmon, R. D. Oct. 22, 1925. Type-printing telegraphs.- In a keyboard start-stop transmitter, provided as described in Specification 228,610 with longitudinally - movable notched combination bars which are controlled collectively, after depression of a key, by a motor operating them against spring action, the bars are so arranged that they can be used for transmitting the signals to line, or for perforating a strip for subsequent use in an automatic transmitter such as that described in Specification 264,906, or fcr both purposes. Each of the combination bars 1 - - 5 carries a lug normally engaged by a lever 9 to prevent its movement to the right by a spring 8. A bar 6, parallel to the bars 1 - - 5 and similarly controlled, is provided with teeth adapted to lock a key in depressed position and to prevent the depression of any other key until the stop signal is being transmitted. The lefthand ends of the bars 1 - - 5 are normally in a common transverse plane and are used for effecting the strip-perforating. The right-hand ends extend successively to points adjacent to the planes of movement of levers 11 - - 15 respectively arranged perpendicularly to the bars, and co-operate with these levers for transmission to line. Start-stop device. A sleeve 35 loosely mounted on a spindle 36 driven from the motor 38 is clutched to the spindle upon depression of any key, and makes one revolution before coming to rest, as described in Specification 228,610, but, to enable the weight of the keyboard to be reduced, the lever 41, 40 for transmitting the movement of the key to the clutch is located beneath the base plate as shown in Fig. 4. The parts 41 and 40 of the lever may be provided with a split bush connection 41<a>, 40<a> for adjustment on the pivot 39. Transmission to line. Upon depression of any key, the corresponding key bar 7 locks one or more of the bars 1 - - 5, and at the beginning of the rotation of the sleeve 35 a cam groove 46 on the sleeve moves the lever 9 to release the unlocked bars for movement to the right by their springs 8 so that their ends extend across the paths of movement of the corresponding levers 11 - - 15. These levers are operated in succession against the action of springs 24, Fig. 5, by cam discs b - - f respectively, acting in cyclic order, mounted on a sleeve secured to the sleeve 35. Each lever 11 - - 15 in succession cooperates with a flat on its cam disc and is then free to be moved by its spring 24 unless its path is obstructed by the end of the. corresponding bar 1 - - 5. Any lever so moved bears on a yoke 23 carried by a pivoted member 21 carrying a switch arm 20, and rocks this member against the action of a spring 22 to move the arm between contacts 18, 19 to effect the transmission to line. A lever 25 operated by a sixth cam disc a bears on the yoke 23 at the beginning of each revolution of the sleeve 35 to transmit the starting signal The cam discs are constructed and assembled as described in Specification 264,906. At the end of each revolution of the sleeve the cam groove 46 moves the bar 9 to restore the bars 1 - - 5 to normal position. The motor 38 may be provided with speed-governing means as described in Specification 273,363, [Class 57, Governors &c.]. Strip-perforating device. The left-hand ends of the one or more bars 1 - - 5 locked by a depressed key serve as fixed abutments for punches 53c, preferably of the kind described in Specification 191,093, carried by a punch block 53 on a support 53a pivoted at 53b. The block 53 also carries three superposed punches 53d coacting with a fixed abutment 53e for punching the feed perforations, and is operated through a link 52 and a lever 51 from a cam groove 50 on the sleeve 35. The strip is fed upwards by a wheel 54 rotated intermittently by the engagement with a ratchet wheel 55 on its shaft of a pawl carried by a member 57 which is rocked about the axis of the shaft against the action of a spring 58, Fig. 14, this rocking being effected through a link 59, a bell-crank 60, a bar 61, and a lever 62 from the cam groove 50, the lever 62 bearing against a lug 63 on the bar 61. The strip is normally fed a distance equal to the pitch of the feed perforations for each revolution of the sleeve 35, but may be fed a greater distance, e.g. when perforations representing a carriage return signal for page printing are to be followed by a blank portion of strip of a length equal to three times the pitch. For this purpose the extent of the return movement of the bell-crank 60 by the spring 58 is determined normally by the arrest of the lug 63 by an arm 64 of a lever connected to the bar 7c of the carriage return key, but depression of this key moves the arm 64. out of the path of the lug which is then free to move further to the left to effect the feed through the greater distance.