Patent GB-184558-A (GB)
Title: Improvements in or relating to perforated tape controlled apparatus suitable for usein connection with printing apparatus
IPC: H04L15/34
Filed: 1921-05-11
Abstract: 184,558. Creed & Co., Ltd., and Creed, F. G. May 11, 1921. Strip-controlled driving-mechanism.-Relates to apparatus of the kind described in Specifications 22653/02, 25861/05, 8999/07, and 1947/08, for printing telegraphic or other messages received in the form of a perforated tape, and comprises improvements in the differential feedmechanism for the tape, and the re-setting devices for the valves, combs, or the like controlling the printing-mechanism. The differential feed-rack h, Figs. 6 and 10, slides in a carrier i supported by a pivoted frame i<1> arranged so that the feed-rack remains parallel to itself in moving into and out of engagement with a pinion g connected to the tape-feeding wheel d. A spring-blade o for operating the feed-rack is moved in one direction by an arm t, operated by a cam u, and is returned by a spring s. The frame i<1> is raised and lowered by means of a link n<1> connected to a lever n operated by a cam j. The selecting-mechanism comprises pairs of selector-plates 1, 1<a> having pins 2, 2<a> engaging perforations in the tape 6, and lugs 5, 5<a> engaging stop-levers 3<a> for the feed-rack. The selector-plates are urged upwards by springs and are normally retained by means of a rod 8 which passes through notches in the selector-plates and is carried by a lever 9 operated by a cam 10. During each cycle of operations, the rod 8 permits the selector-plates that are opposite perforations to rise and move the associated stop-levers 3<a> out of the path of the feed-rack. The frame i' is thereupon depressed and the feed-rack is moved into contact with the pair of selectorplates opposite the double-blank space at the end of a letter. When the frame i ascends, the feedrack re-engages the feed-pinion and is returned to the normal position. The re-setting mechanism for the combs 11, 11<a>, Fig. 10, or other devices controlling the printing- mechanism comprises pairs of re-setting levers 12, 12<a> mounted on a carrier, for example a pivoted member 15 operated by a cam 15<x>, adapted to move the resetting levers longitudinally. The re-setting levers engage the selector-plates 1, 1<a>, preferably by means of pairs of lugs 13, 14, and at each operation the effective selector-plates rock the associated re-setting levers into position for engaging fingers 11<b>, 11<c> on the combs. One of the levers or bars 16 controlling the printing-mechanism is released at each operation, the combnotches being arranged to render ineffective the combs beyond those appropriate to the selected letter, even though some of these combs may have been moved by their selector-plates. The feed-rack and tape-guide are preferably arranged horizontally. Type-wheel machines; hammer-impression arrangements.-The above-described apparatus may be combined with printing-mechanism of the kind described in Specification 164,370, the shalt 17 carrying the type-wheel 18 being preferably arranged parallel to the cam shaft m. The impression-hammer 31 is yieldingly mounted, by means of a stud 39 engaging a spring 40, on an arm 38 actuated bv a cam 37. The sleeve 26 for releasing the levers 16 is actuated by a forked lever 27 engaging a cam 30.