Patent GB-190505490-A (GB)
Title: Improvements in or relating to Telegraphic Apparatus.
Inventor: CREED FREDERICK GEORGE
Filed: 1905-03-16
Granted: 1906-03-15
Abstract: 5490. Creed, F. G., and Coulson, W. A. March 16. Telegraphs.-Relates to improvements on the telegraphic receiving apparatus described in Specification No. 1061, A.D. 1902, in which tape is perforated by punches operated by a pressure motor, the valve of which is controlled by the line impulses. The action of the line impulses will be understood from Fig. 5 ; in this arrangement the tongue e of a relay is thrown over from the contact i to the contact i<1>, completing the circuit of a powerful local current supply k through the contacts w, i<1>. The immediate result is the energization of the coils a b, a<1> b<1>, which rock the spring bar g carrying the contacts t, t<1> over so that the contact t<1> w<1> is made and the contact t w is broken, causing the cessation of the local current. The resistances n, n<1> are introduced to prevent a short-circuit when the spring bar g is in a mid-way position. The action of the coils on the rocking bar is shown more in detail in Figs. 1 and 3. Two soft-iron pieces c, c<1> are connected across by the bridgepieces c<2> and supported by the rocking spindle d, which at its upper end carries the spring bar g mounted so as to damp any oscillation and provide good rubbing contacts. No matter how long the relay tongue may remain against either of the relay contacts i, i<1>, no current flows through the magnet windings except the temporary or initial current of unit length necessary to operate the armature, thus enabling powerful currents to be used. The operation of the air motor, punches 13, and correcting-rods 12 is shown in Figs. 1 and 3. The rocking armature is connected by a long thin arm c<2> to the valve of the motor, connexion being made by means of a split end c<4> and link c<5> to avoid wear. If the piston 6 is moved to the right, the bell-crank levers 7<a>, 7<b>, 7<c> are rocked on their pivots 8 and the connecting-arm 9 is moved to the left, sliding the stop 21 to the left. The striker arm 10 on the left sliding in line against a fixed stop is depressed. The striker arm 10, which is shown more in detail in Fig. 9, has two prongs 10<b>, 10<c> connected across by a bar. The former when in line is adapted to strike the punch 13, and the latter the correcting-rod 12. The tape wheel 17 with the two correcting-wheels 16 is driven through the friction gearing 22, 23 from the pinion 29 on the axis of a friction disk 30 which is driven by the longitudinally-adjustable rubber wheel 31 of an electric motor 33, this adjustment permitting variation in the speed. The correcting-wheels 16, Fig. 7, have teeth 16<x> into which the ends of the correcting-rods enter. These teeth have parallel faces so that the correction is made before the punch has perforated the paper. The punches and correcting-rods have shoulders 13<a>, 12<a>, which, engaging with corresponding shoulders on the prongs 10<b>, 10<c>, prevent rotation. If, then, the head of the punch is slightly broader than the head of the correcting-rod, the prong 10<b> will be knocked aside off the rod 12 by the stop 21 moving to the left just before the punch has finished its stroke. The latter may therefore exert its fall power without the correcting-rod injuring the teeth 16x. The stop 21 then moves the prong 10<c> aside, and the punch and correcting- arm spring back into position.