Patent GB-190603679-A (GB)
Title: Improvements in and relating to Recording Apparatus for use with Signalling Instruments and for other like purposes.
Inventor: PEARCE WILLIAM GEORGE
Filed: 1906-02-14
Granted: 1907-05-14
Abstract: 3679. Pearce, Sir W. G., and Reeves, W. R. Feb. 14. Typewriters and like machines.-Consists in a recording- apparatus for telegraphic signals, and is described in connexion with an ordinary railway signalling - system. The signals are recorded on a paper covered drum by dies pressing upon n a ribbon, the time of the signal being simultaneously printed by a series of wheels electrically operated from a synchronized clock. The time-printing mechanism is then held inoperative until the next minute appears on the wheels, when any subsequent signal causes the impress of the time to be made on the drum. The operation of signalling produces the rotation and advance of the drum a, which is mounted on an axle b of which one end is screw-threaded, and engages with half-nut e, a slotted bell-crank lever 8 enabling the latter to be lifted out of engagement. Pawls 20, Fig. 3, and a finely-toothed ratchetwheel g serve to rotate the drum, the pawls being mounted on one arm of a lever h which is controlled by the motion of the armature 21 of an electro-magnet 26 in the signalling circuit. The return of the arm is effected by a spring 22, but is retarded by flyer vanes or by a dash-pot 28 as shown, so that it is not complete between the various signs of one code signal, the longer time elapsing between different signals producing a greater interval on the record than that between the signs of one signal. The roll of paper m, Fig. 7, is contained within the drum, and is led over a roller w, round the drum, and under a bar a, which is supported on rods r sliding in blocks q attached to a door o, so that, on this door being closed, the paper is clamped between the bar s and lip t as shown. A door 2 in the outer casing 1 is adapted to open and close the door in the drum by the engagement in one position of projections 6 on the rods r with lugs 4 on the outer door. When the outer door is closed, a knife 12 cuts off the record previously made, a margin serving for notes or binding being left, The doors are brought into engagement by lifting the half-nut e, Fig. 9, and rotating and sliding the drum until a set-pin 9 enters a hole in the axle bearing-plate f. The time-recording apparatus comprises a ratchet-wheel 31, Fig. 14 having ten teeth which rotates with a single-toothed ratchet-wheel 32 and with a printing-wheel 36 bearing the numerals 1 to 9 and 0, corresponding to unit minutes ; a six - toothed ratchet-wheel 33 and a single-toothed ratchet 34 rotate with a printing - wheel 37 bearing the numerals 1 to 5 and 0, corresponding to tens of minutes ; finally, a ratchet-wheel 35 of twelve teeth rotates with a wheel 39 bearing the numerals 1 to 12, which marks the hour. The ratchet-wheels are actuated by double pawls 45, 46 and a single pawl 44, all mounted on an arm 40 which is caused to rock once a minute by the completion of a circuit through an electro-magnet 43 by means of the cabin clock. The time is recorded on the drum when a pair of electro-magnets 62, Fig. 12, energized by the passage of the current, attract an armature 63 and raise the printing-wheels beneath an inking-ribbon 95. This motion releases a spring switch arm 70, and breaks the circuit through the magnet until after the next movement of the rocker 40, when a pin 65 presses back the arm until it is retained by a spring catch 71 and a detent 73. The time will therefore be recorded only once within one minute. The signal characters are marked by bars 83 guided in frames 85, and actuated by the armature 88 of the corresponding electro-magnet 90 to strike upon the drum. The inking-ribbon is wound alternately from one to the other of two reels mounted on the spindles 92, Fig. 5, of two ratchet-wheels 98, of which one at a time is rotated by its pawl 97 actuated by the lever h. Reversal of the winding is effected by mounting on the spindle of a wheel 111, which is rotated one tooth at a time by a pin 110 on the drum, a segment 112 having half the number of teeth of a pinion 113, which by means of a pin 117 swings over a lever 118 and causes the other pawl 97 to come into the driving position. Fig. 18 shows the electric connexions employed, 128 being the cabin to which the apparatus is fitted, and 127, 129 adjacent cabins on opposite sides. The operation of the plunger 135, for instance, completes the circuit through the corresponding printing electro - magnet 90, the armature of which is arranged to make a spring contact 145 in the circuit of the drum-advancing electro-magnet 26 and the time-printing electromagnet 62, in the latter of which the contact 67 above mentioned is also placed. The circuit of the time printing-wheel advancing electro-magnet 43 is completed periodically by the clock 130.