Patent GB-434021-A (GB)
Title: Printing telegraph receiver
IPC: H04L15/34
Filed: 1934-02-19
Abstract: 434,021. Type - printing telegraphy. PENOT, R. E. M., 10, Rue Perree, Paris. Feb. 19, 1934, No. 5456. Convention date, Feb. 17, 1933. [Class 40 (iii)] In a type-printing receiver operated by wheatstone morse or like signals the durations of the signal impulses determine the distances through which racks are moved during signal-controlled engagement with pinions. The speed of the motor is adjusted by means of a rheostat graduated in words per minute. Distinction between dots and dashes. When a marking current is received the polarized line magnet 5, Fig. 1, moves the escapement plate 8 so as to cause the rack 11 to engage the friction-driven pinion 9 and the bar 15 is drawn forward. In the case of a dot the bar is released before it has produced any effect, but in the case of a dash it acts camwise on the feeler 22 which by means of link work tilts the lever 59 and so raises the guide 57 which raises the striker 35 opposite a dash latch b, whereas if a dot has been received the striker remains opposite a dot latch a. Setting of combiner discs. Movement of the escapement plate 8 at the beginning of a dot or dash releases the shaft 30 for half a revolution. Cam 28 thus operates the pawl 38 to advance the rack 50 one step, and this rack positions the striker 35 opposite to the first of six pairs of latches a, b, so that the striker is ready to select the dot latch a or the dash latch b as the case may be. At the same time lever 36 acts through rod 40 to reset the rocker 59 if necessary (and with it the guide 57, and striker 35) to the normal or dot position, where it remains unless a dash is being received. At the end of the dot or dash the cam 28 makes a further halfrevolution and acts through lever 42 and linkwork to drive the striker 35 against the appropriate latch. When a letter space is received the rack 12 engages the pinion 10 long enough for the cam bar 16 to actuate the feeler 25. This acts through the parts 65, 66, 67 to move the latch 69 and so engage a clutch which enables the shaft 31 to drive the sleeve 73, and cams 74, 75, 76 thereupon perform one revolution. The clutch is disengaged again at the end of the revolution by the action of cam 75 through the parts 82, 79, 67, Fig. 2. During the revolution the cam 75 acts to cause the lever 90 to move thirteen turning-bars 93 rightwards. These bars have been set into their upper or lower positions according to whether their dot latches a or dash latches b, have been tripped, and they act through pivoting pieces 97 to set the combiner discs 96. The turning-bars 93 are at once brought back through the action of the cam 75 and the latches a, b are reset upon them by cam 75 acting through arm 100. Finally the cam 75, Fig. 1, acts through the parts 101, 102, 56 to lift the retaining pawl 51 so that the slide 50 is restored to its rest position. Printing. One letter is printed while the previous letter is being registered on the latches a, b. Cam 76, Fig. 2, during the revolution of sleeve 73, acts through lever 111 to permit motion of the spring-urged striking- disc 110 so that fifty-one striking-bars 105 fall against the combiner discs 96 and the one selected by the combination is caught by its hook 105a and driven so as to actuate the typebar 106 against the platen 117. The throw of the striking-disc is limited by an adjustable abutment 118. Tape-feed and word-spacing. The tape feed is effected by a pawl 121, Fig. 2, on the return stroke of the lever 111 which is driven by the printing cam 76 and acts through a push-rod 135, the throw of which is ordinarily limited by an abutment 132 so that the throw of the pawl is only sufficient to move the tape through a letter space. When a word space is signalled, however, the rack 12, Fig. 1, is drawn far enough to enable the feeler 24 to be actuated. The feeler acts through the shaft 137, Fig. 2, to withdraw the abutment 132, so that the pawl 121 then has a throw sufficient for a word space. Effect of parasites. The thirteen latches a, b comprise six pairs of combination latches and a thirteenth latch which is associated with signal-failure. If a letter space is filled with parasites so that a letter having more than six elements is produced, the striker 35 reaches the thirteenth latch and so produces actuation of the thirteenth combiner disc 96. This thirteenth combiner disc is also actuated through the feeler 23, Fig. 1, by means (not shown), if a dash is lengthened beyond its normal duration by parasites. The thirteenth disc blocks all combinations for letters and admits a striker-bar 105 which causes a " signal not understood " indication to be printed.