530,243. Typewriters &c. STANDARD TELEPHONE & CABLES, Ltd. April 6, 1939. No. 10786. Convention date, May 3, 1938. [Class 100 (iv)] [Also in Group XXXIX] In a machine for printing on a ticket the information necessary to assess charges for telephone calls, the printing magnet during successive operations stores energy in a spring for use in severing the ticket, and during each operation stores energy in a further spring for stepping forward the ticket roll. The types are carried by star wheel 12 fixed on the shaft 13 of the selector switch B set by digital impulses. The armature 18 of magnet 17 operated by printing impulses effects printing by means of cranked lever 19 and steps a ratchet wheel 24 by means of pawl 23. The ratchet wheel 24 drives a gear train 34, 33 and also tensions a bow-spring 27 driving a paper-feed roller 28 coaxial with the ratchet wheel 24 and co-operating with feed roller 5, but the feed is not operative in the printing position of the magnet armature since it is held by pawl 31. The gear train tensions a spiral spring 35 anchored to a plate 36 which is prevented from rotating counter clockwise by a pin 39 and escapement lever 38. When the gear train moves in response to the first printing impulse, a cam fixed to gear wheel 33 co-acts with projection 42 to lift the escapement lever 38 which also operates spring 41 (cam contacts (EC 1, 2,) Fig. 1), whereupon the plate 6 rotates slightly until stopped by abutment 63 of the escapement, During further rotation of the gear train by subsequent printing operations, cam 53 operates arm 51 and contacts 49, 50 (cam DS, Fig. 1) and cam 48 operates arm 46 and contacts 44 (cam CC, Fig. 1). When the printing has been completed and the ticket advanced to the severing position by further operation of the printing magnet, gear wheel 33 is in the normal position, lever 40 drops and pin 39 freed from escapement abutment 63 permits plate 36 carrying cam 54 to rotate until pin 39 meets abutment 43, shock being deadened by the swan-necked form of the escapement lever. Cam 54 operates lever 56 which moves cutting blade 61 on a fixed guide to co-act with fixed blade 59 in severing the ticket. During rotation of cam 54 paper feed is prevented by holding pawl 31 a lug 64 of which rides on the periphery of plate 36. Circuit arrangements, Fig. 1. The printer is connected to the trunk equipment at W1-12, the idle condition being ground on wiper B2 of the type selector connected to W10. When the trunk is seized, relay contacts MSC are operated and the digits of the wanted party are transmitted to stepping magnet 16 of the printer by contacts SIC, delayed alarm relay AR being connected over the off-normal commoning of B1. After each digit is transmitted, contacts PIC send an impulse to magnet 17 which prints the digit and, by means of ratchet drive 24 winds up a spring 35 and advances the shaft of cams EC, CC, DS, the test circuit being opened by cam EC on the first step. The printing magnet 17 also operates and locks relay RR, and when the magnet releases, MSR interacts with stepping magnet 16 to restore the selector whereupon RR releases. After all the digits have been transmitted, impulses transmitted by PIC with the selector at normal, cause magnet 17 to print dashes. Digits of the tariff rate and calling party terminated by dashes are printed in similar fashion, the printer with the cam shaft in position 29 then awaiting the duration impulses, and change-over contacts TR in the trunk equipment being operated. After the three minute period has been recorded on the reply of the called party, impulses sent every minute from SIC step the selector. On termination of conversation contacts MSC in the trunk circuit restore and if the duration is less than 9 minutes, the printing magnet 17 is operated over commoned contacts 1-9 and the selector goes home. If the duration is 10 minutes or more, digit 0 is printed one for each 10 minutes interval followed by a units digit. When the connection is released, the restoration of contacts MSC operates SIR which connects impulse machine MSI to magnet 17 whereby dashes are printed and the ticket completed and severed. The cam shaft in its normal position releases SIR which disconnects the impulse machine. If the duration is longer than can be recorded on a single ticket, the recording is completed on the next ticket. In the last recording position (32) cam CC operates followed by SIR which causes completion and severing of the ticket as previously described and when the cam shaft reaches normal the printer is ready to receive further duration impulses. The tickets for one conversation are identified by serial and machine numbering. Limiting duration of conversation. A circuit over contact 6, 9 or 2 of the selector is connected over a strap D6-D12, according to whether limitation is required to 6, 9 or 12 minutes, to contacts controlled by cam DS which closes contacts 1 in position 29 (6 or 9 minutes) and contacts 1 and 2 in position 30 (12 minutes), whereby a signal is sent over W7 to the trunk equipment. Alarm and supervisory arrangements. Lamp BL is lit when the trunk is in use, and lamp EPL when the paper rolL is exhausted. The relay AR operated when the printer is in use to close a delayed alarm circuit, is not energized when duration is being signalled in positions 1 to 9 of the selector, contacts TR being unoperated at this time, otherwise the relay would bring in an alarm during this 9 minute period. Also, when the impulses machine is in operation at the termination of conversation AR is operated by impulses to bring in the alarm if the printer does not restore. When a new paper roll is required, the opening of the ticket channel closes contacts 9(2) to operate the printing magnet which steps the cam shaft off normal and releases. When the paper is introduced and the channel re-closed, the printer steps forward to normal and a blank ticket (dashes only) is made and severed. A similar ticket is made in the case of no reply or premature release. The Specification as open to inspection under Sect. 91 comprises also the application of the invention to telegraph exchange systems and describes automatic normalizing of printer when placed in the box. If the cam shaft is offnormal SIR operates to connect the impulse machine MSI to the printing magnet whereupon the machine proceeds to normal. If the selector is off-normal, printing magnet 17 is operated over wiper B1, RR pulls up, MSR interacts with the stepping magnet 16 to restore the selector and the ticket is completed and severed as previously described. This subject-matter does not appear in the Specification as accepted.