Patent GB-191328939-A (GB)
Title: Improvements in and relating to Apparatus for Perforating Tape for the Automatic Transmission of Telegraph Signals and for other like purposes.
IPC: H04L15/10
Filed: 1913-12-15
Granted: 1914-12-15
Abstract: 28,939. Eastern Telegraph Co., Fraser, A., and Wood, K. L. Dec. 15. Feeding webs.-In a machine for perforating tape for telegraphic and like purposes, the operative parts of the apparatus are controlled by one or more electric circuits and the energy of the operation is derived from a continuouslydriven shaft. The operation of a key corresponding to a dot, dash, or space energizes its corresponding magnet 14, Figs. 3 and 5, which attracts its armature 13 and, by rocking the shaft 11 through links 12, 11<b>, serves to release from a detent 8 a resilient catch 5, which, by engagement with a toothed disk 4 on the shaft 1, clutches thereto an operating-sleeve 3. This sleeve carries cams for declutching the sleeve at the end of a revolution, for actuating the punch-driver and tape-feeding mechanism, and for releasing at intervals a differential stop of the feed mechanism. The tape is fed by a pinwheel actuated by ratchet mechanism 41, 42, Fig. 1, the pawl 42 being shaped as shown to coact with the wheel 41 and stop 42<a> so as to lock the ratchet-wheel at the end of its movement without intermediate jamming action. The pawl is operated by the lever 43, the spring48 tending to keep it down on the ratchet-wheel. An automatic differential feed is provided whereby the tape is fed, on the depression of a dot or dash or space key, through a space equal to the space of the signal last punched together with an additional space if there is appreciable delay between the release of one key and the depression of the next. The feeding-pawl 42 is actuated by the reciprocation of a feed-bar 45 by a cam-oscillated driver 61, the length of feed being controlled by the initial position of the bar 45, this position being determined by a differential feed-stop 50 adapted to be swung into position to arrest an abutment 51 on the bar 45. The stop 50 normally arrests the bar 45 for unit or dot feed, but when a dash key is operating, a projection 25<a> on its selector 25 rocks a shaft 57 by engagement with an arm 65 thereon, and by means of links 56, floating lever 58, and link 60 raises the stop 50 to present its second tooth to the abutment 51, thereby securing a double feed at the next operation. A detent 68 engages a tooth 69 on the shaft 57 to lock these parts in their positions for a double feed, the detent 68 being thereafter released by the cam 18. When the space key is depressed, the same operations as those resulting from the depression of a signal key are effected with the exception that no punch is selected, but the feed corresponding to the signal last punched takes place as with the depression of a signal key. For the purpose of securing the additional feed referred to above corresponding to the delay in the operation of the keyboard, an extra-space magnet 52, Fig. 7, is energized and the resulting attraction of the armature serves to rock the shaft 54 and, through links 55, 59, 58 and 60, to raise the stop 50 to the extent of an additional tooth. The energization of the magnet 52 by means of an induced current is illustrated diagrammatically in Fig. 7. The operation of a. key D serves to energize its corresponding magnet 14 and the attraction of its armature closes the circuit of a delay magnet 71 provided with two spring-retracted armatures 73, 74, and having an adjustable resistance 72, in a shunt path, for the extra current induced when the circuit of the magnet is broken. The strength of the springs and the normal positions of the armatures are such that the armature 73 is the first to be attracted when the magnet is energized and also the first to be retracted due to the fall off of the induced current when the circuit of the magnet is broken. The connexions of the magnets 14 for the dot and dash keys D, D<1> are such as to prevent both magnets from being energized simultaneously. When it is desired to operate the apparatus by means of incoming signals, two delay magnets 71 are employed and the signalling key 8 is dispensed with. A short pause between the receipt of successive signals will cause the extra-space magnet 52 to be energized by the operation of the first delay magnet, and if a longer pause occurs, the second delay magnet is de-energized, with the result that the circuit of the word-space magnet is completed.