Patent GB-204398-A (GB)
Title: Improvements in or relating to telegraph receiving apparatus for producing punched tape
IPC: H04L15/32
Filed: 1922-06-28
Abstract: 204,398. Creed, F. G., and Creed & Co., Ltd. June 28, 1922. Perforated strip recorders.-A tape-perforating receiver for cable - code signals, which is adapted to translate and punch block signals, comprises a tape-feed wheel moved in synchronism with the transmitter, two punches selectively operated, punchselecting mechanism controlled by a polarized relay, and punch-operating mechanism which is connected to or disconnected from a continuously running shaft under control of a non-polarized relay, the relays being subject to the received positive and negative impulses so that the selector is moved laterally in one direction or the other depending upon the polarity of the received impulse, and starting and stopping of the punchoperating mechanism occurs each time a signal is received irrespective of its polarity. The arrangement is such that, when the punching mechanism is operative, a hole is punched and the tape feed moves the tape forward a distance equal to that between the centres of adjacent feed holes, for each rotation of the shaft. When a block signal is received corresponding in duration with, say, four correctly punctuated signals, the selector remains in the selected position and the punching mechanism operates four times in succession. A feed wheel a associated with a correcting wheel b coacting with a corrector rod m, as described in Specification 165,820, and mounted on a spindle c, is driven through a friction coupling d and worm gear e from the main shaft f. Two punches g, h are adapted to perforate the tape at opposite sides of the feed holes. The punches are operated by a reciprocated member n in conjunction with a selector r. The selector r is laterally movable in the member n and is connected by a rod t to the tongue of a polarized relav v so that a projection r<3> is brought behind the inner end of the selected punch g or h according to the polarity of the received impulse. The member n is reciprocated at the required time by a cam w (which also controls the rod m) of the kind described in the aforementioned Specification. On its forward movement, member n, carrying with it the selector r, moves the selected punch to effect a perforation. On its return movement, ribs n<1>, n<2> on member n, engaging notches in the punches, ensure withdrawal of the selected punch. A spring-blade stop j prevents the inoperative punch from being moved back frictionally to an extent which would prevent projection r<3> from passing behind it when subsequently necessary. Rotation of the cam w is controlled by an escapement device. Cam w is secured to a sleeve 9 which carries a pawl 6 tending, under the action of a spring 18, to engage a ratchet wheel 10 on a shaft 2 driven through a friction device 3, the pawl being held out of engagement, and rotation of the cam arrested, by the end of a rod 11 secured to the tongue of a non-polarised relay 12. On receipt of a signal impulse, rod 11 is momentarily withdrawn, the pawl engages the ratchet wheel, and sleeve and cam make one revolution, being again arrested by rod 11. The two relays are preferably double-acting power relays of the kind described in Specification 172,717*, [Class 38 (v), Electric switches &c.], and two such relays may be used with a split battery and under control of a neutral line relay.