Patent GB-811343-A (GB)
Title: Improvements in or relating to printing telegraph apparatus
Inventor: WALLENS ANTHONY WALTER
IPC: H04L13/06
Filed: 1957-05-03
Abstract: 811,343. Type-printing telegraphy. CREED & CO. Ltd. May 3, 1957, No. 14249/57. Class 40 (3). [Also in Group XVI] In printing-telegraph apparatus, the tape on which the message is to be printed can be fed to a particular printing position in. which it can be held until means operative on the receipt of a predetermined code signal combination immediately preceding a message allows the tape to be fed past said particular printing position. A lever 1 pivoted at 2 is urged by a spring 3 so that a seeker 4 is held in contact with the tape 5 which passes between guides 6, 7. Normally at the end of a message, the beginning of the next message section is not opposite the printing position, and a number of letter-space signals are transmitted so that the tape 5 is fed by the conjoint action of a feed roller 8 and a pressure roller 9 on an arm 10 normally operated by a solenoid 14. When the tape has moved so that the beginning of the next section is opposite the printing position, the seeker enters a perforation and by an arm 15 operates a microswitch 16 so that contact 17 is moved from the position shown in Fig. 7a and causes magnet DM/1 to move the arms of a 5-bank uniselector switch 19 to its position 2. The transmission of further space signals operates contacts 23 so that the arms of the uniselector 19 are moved to position 4 in which a circuit is completed over banks 4, 5, Fig. 7b, to energize individual knife solenoids 25, corresponding receivers to actuate a knife member 27 in a block 28 to cut the tape 5 so that a message portion of predetermined length is removed. The selector 19 stops at position 5. At the commencement of the next message the reception, of a signal, such as carriage-. return, preceded by letter-shift, pulls down a lever 29 engaging a projection 31 on a lever 32 sliding in guides and provided with a cam projection 33 engaging a roller 34 on the lever 1 which is moved so that the seeker 4 is disengaged from the tape and the contact 17 moved to the position 'shown in which the solenoid 14 is energized to effect the feeding of the tape. A circuit is also completed for magnet DM/1 which steps the uniselector 19 to position 6. The initial part of the message operates DM/1 to step the selector over contacts 6 to 12 which, on bank 3, are connected to solenoids 37 included in printers which do not require the first part of the message. As shown in Fig. 6, the operation of solenoid 37 rocks pivoted lever 40 connected by pins 43 to a pivoted bell-crank 44 which through a slot 48, can move upwardly independently of the setting of the selector combs 47 and by the engagement of a projection 49 with a stop 50 on the clutch member of the type-carrier arrests the latter so that a blank space is in the printing position. In the arrangement described the bell-crank 44 is arranged to be operative to arrest the type-wheel before the bell-crank controlled by carriage return is operative. East-west and west-east messages may be printed in different colours, e.g. black and red. For normal operation, on the movement to the left of the bar 54 prior to the printing operation, the block 58 on the arm 57 engaged by a stop 61, rocks the shaft 60 and levers 67, 62 so that the ribbon carrier 53 is raised to the position in which the upper (black) portion of the ink ribbon is effective for printing. If printing in red is to be effected, a solenoid 72 is energized in response to a function signal, e.g. Bell, and a two-armed lever 75, 77 is rocked so that the end 79 obstructs the lower end of lever 57 when the bar 54 moves to the left, and the increased rotation of the shaft 60 lifts the carrier 53 to a higher position in which printing takes place from the lower (red) portion of the inking ribbon.