Patent GB-853989-A (GB)
Title: Improvements in perforating apparatus for perforating the elements of a signal combination
IPC: H04L13/06
Filed: 1957-10-26
Abstract: 853,989. Type printing telegraphy. HANDLEY, J. Sept. 12, 1958 [Oct. 26, 1957], No. 29258/58. Divided out of 853,988. Class 40(3). In apparatus for effecting perforation according to the elements of a signal combination, the punching mechanism is reciprocated continuously, and as the punches and paper are being separated from one another after one punching operation, the selection of the punches for the succeeding punching operation is initiated. As shown in Fig. 1 the punch pins 1 are held in their normal upward positions by leaf springs 10 and are selectively moved downwardly by cam portions of rockable levers 3 which are mounted on shafts 5 fixed directly to the armatures of eight relays 4 which are selectively and simultaneously energized according to the elements of an 8-unit code combination. The punching operation is effected by a punch member 6, carrying a stripper plate 54, which with the paper is moved upwards against the selectively set pins 1 by a frame having two side members 7 carrying rollers 8 which engage lobes on cams 9. Each of the cams has eight lobes and with the shaft carrying the cams rotated at 3000 r.p.m. the operative time between the successive punch actuations is 2À5 m.secs. The operative period of the lobe in relation to the punch pin is arranged to be 1À0 m.secs. and at the beginning of the second half of this period the selective energization of the relays for the succeeding combination is initiated so that a period of about 2 m.secs. is provided for their operation. The paper is fed after the punching operation by two associated feeding and clamping devices 55, 56 operated by rollers 58 engaging cams on sleeves carrying the cams 9, 33 alternately to effect feeding of the tape by jaw members 55, 56 which alternately clamp the tape in preparation for the feeding movement during the periods between the tape perforating operations by the upward movement of lower members of the jaws under control of a lever 57 carrying a roller 32 engaged by an eightlobed cam 33. The clamping operation of the member 55 is effected by a lever similar to 57 controlled by a cam on the same shaft as the cam 9. To prevent the feeding of the tape when signals are not being fed to the perforating apparatus, the armature of a relay 24, energized when signals are being passed, carries a projection 29 which in the unoperated condition of the relay engages a projection 28 on the lever 57 to prevent its movement to effect clamping of the tape. A relay similar to relay 24 operates to prevent upward movement of the lower block of the clamp arrangement 55 when signals are not being received. The relays 24 may be operated by alternate signals, or simultaneously by all signals. In an alternative arrangement of the punching apparatus, Figs. 6, 7, 8 (not shown), the punch pins 1, which are normally maintained in their upper positions by springs, have at their top ends two flat surfaces connected by a sloping surface so that the pins which are depressed by the operation of their associated relays 4 are locked in their actuated positions. Specification 795,611 also is referred to.