Patent GB-346768-A (GB)
Title: Train booking machine
IPC: B61L1/20
Filed: 1929-12-12
Abstract: 346,768. Block signal recording apparatus. BRITISH POWER RAILWAY SIGNAL CO., Ltd., Windsor Works, Slough, PARSONS, J., 1530, Avenida, Rosario, and GRAHAM, J. H., Fisherton, both in Santa FÚ, Argentine. Dec. 12, 1929, Nos. 38158/29 and 12236/30. [Class 105.] Apparatus for printing the time of receipt of block signals and the train description number comprises electromagnetic means controlled by the block instrument so that the printing of a time record of the receipt of a signal, e.g. " line clear," can only be effected when the block instrument indicates that particular signal. The printing may be effected automatically or by manual control. Figs. 1 and 2 show part sectional elevations and Fig. 14 the control circuits of an automatic apparatus. The record strip 1 is wound up on to a spring spool 3 under the control of an electro-magnetically operated escapement pawl 18 and ratchet wheel 17 on a roller 4 against which the strip is forced by a spring-pressed roller 14, and the printing is effected by an electromagnetically operated hammer 37 which drives the record strip 1 and an ink ribbon 8 against typewheels 22 to print hours, minutes and seconds. The ink ribbon is kept taut by a spring arm 12. The time printing wheels are electrically operated from the cabin clock with the seconds wheel moved every ten seconds but locked during the moment of printing by a detent 29, Fig. 14, engaging a notch in the seconds wheel 24. On receipt of a "line clear " signal the block instrument indicator 99 moves to a contact Z to pick up relay B11 over contact C of relay CO3 (assumed and shown energized) ; relay B11 is held by a stick circuit over contacts LC and A, and at contact D energizes locking relay 32 and at contact E applies battery to hammer magnet 40<1> which is energized when the contact K is made on the locking of the seconds wheel 24. Contact H of hammer magnet 40<1> picks up relay CO1 which is held by a stick circuit over contact J of relay CO2. Relay CO1 breaks the stick circuit of B11 at A and of CO3 at B; contact C of CO3 opens the pick-up circuit of B11 so that B11 is deenergized and contact E. opens to de-energize magnet 40<1>. The apparatus is now in a condition to cause a similar actuation of hammer magnet 402 when the block instrument indicator goes to " train on line" and closes contact Y. The receipt of "line blocked " signal similarly actuates hammer magnet 40<3>. This magnet 40<3> controls the magnet PM, Fig. 14 (magnet 21, Fig. 2) whereby the record strip is advanced a line space; this movement is effected by the energization of a slow-release relay PMX which is picked up over front contact MB and held over its own front contact P and a back contact Q of the feed magnet PM which is energized on the falling back of contact MB but after a short time is de-energized by the opening of a contact of the slow-release relay PMX, the stick circuit of which is broken at contact Q. A manual control of the printing, subject to control of the block signalling instrument, is provided in the apparatus shown in Fig. 10, which comprises a contact carrying drum 60 on a spindle 61 which is prevented from movement in one direction by a pawl and is locked by a detent unless an electromagnet 85 is energized. The spindle carries a disc 65 with indications similar to the block instrument and the drum contacts are so arranged that the locking magnet can only be released to move the disc if the disc is in a position corresponding with the block instrument. In the position shown, the lock magnet can only be released if the block instrument indicator applies battery to the contact 80 which is connected by drum contact 63 to a contact 79 leading to the lock magnet. The printing is effected by depressing a spindle plunger 68 to close contacts 721, 72<2> whereby battery is applied over bridged contacts 73, 74 to the hammer magnet corresponding with the position of the drum and therefore with the block signal received. The train member may be printed by means of manually set type-wheels adjacent the time type-wheels or by solenoid operated typewriter apparatus. The first Provisional Specification describes an apparatus with one set of time wheels but having a movable carriage for the record strip so that the different signals can be registered.