Patent GB-559466-A (GB)
Title: Improvements in or relating to printing telegraph apparatus
IPC: H04L17/00
Filed: 1942-08-14
Abstract: 559,466. Type-printing telegraphs. CREED & CO., Ltd., SALMON, R. D., and KIRCHEL, A. A. Aug. 14, 1942, No. 11402. [Class 40 (iii)] In a printing-telegraph receiver, a " function" selector member is allowed to move in one direction when the corresponding function is to be performed and in the reverse direction to initiate the performance of the selected function. In the receiver described, the following functions are provided for printing, letter-spacing, figure-shift, letters-shift, printing without spacing. spacing without printing, release and arrest of reperforator. The receiver described comprises combination bars 1 ... 5, set by received impulses as in Specification 482,048, and linked to forked levers 100 controlling levers 111, of aggregate-motion translating mechanisms as in Specifications 441,090 and 466,815 one such mechanism controlling rotation of the type-wheel 102, Fig. 2, and the other controlling case-shift. The combination bars 1 ... 5 are notched to select the function selectors, some of which, 6, 7, 8, 9 are shown in Fig. 1. Most of the selectors carry pivoted levers, e.g. 6a, Fig. 1, having a lug 6c adapted to engage a tooth 6d on an associated secondary bar 6e. The selectors 6 ... 11 &c. are normally pressed by springs against a bail 20 controlled by cam 110, Fig. 1, and when this moves to the right, after the combination bars 1 ... 5 have been set, the selected function selector, say 6, Fig. 1, moves with it so that the lug 6c passes under the tooth 6d so that when the bail moves to the left the selected secondary bar 6e is moved to the left and operates the desired function. Printing and letter-spare functions.-The letterspace and printing selectors 10, 11, Fig. 2, are not notched so that they are operated on each movement of the bail 20, the associated secondary bars 10e, 11e operating levers 32 controlling catches 51, 53 releasing the letter-spacing feed 107, 108, and printing cam 109, respectively. In order to suppress printing or letter-spacing when certain functions are selected, pivoted bars 21, 22 are removed forwardly in Fig. 2 when these functions are selected and engage the vertical parts of levers 10a, 11a which are moved so that the lug 10c, say, does not engage tooth 10d when the selector moves to the right in Fig. 2, thereby preventing the operation of the secondary bar 10e when the bail 20 moves to the left. The pivoted bars 20, 21 are moved, for this purpose, by upstanding projections on selectors 7, 8, 9 &c. Special selectors 12, 13, Fig. 3 (not shown), provided for printing without spacing, and spacmg without printing, these selectors having upstanding projections to engage bars 20, 21 but not having secondary bars (like 6e) to operate a selected function lever. Case shift.-The secondary bars 8e, 9e of selectors 8, 9, Fig. 1, for " letters " and " figures " have depending lugs co-operating with a threearmed lever 40 which moves a sixth combination bar 25 to the left or right where a " figures " or " letters " signal is received. The bar 25 is provided with a forked lever 100 which controls the case-shift of the type-wheel The bar 25 is notched so that it acts to select certain function selectors which are only to be selected in the "figure" shift position. Functions selected by three successive different signals, e.g. by " figures ", the " all-negative " signal, and a function signal. To provide for such functions, a seventh combination bar 26 is provided and this is operated through a bell-crank lever 59 by the secondary bar 7e of a selector 7 selected by the " allnegative " signal. The bar 26 then co-operates in the selection of the desired function by the third signal. Functions selected by repetition of the same signal, e.g. three times.-For this purpose a secondary bar is provided with three teeth adapted to engage with the pawl carried by the selector bar, and with two teeth engaging a pawl. The secondary bar is thus moved forward step by step and operates the selected function only on the third step. Reciprocal functions. Functions which initiate and terminate a particular control, such as case shift, are termed reciprocal functions. The release and arrest of a reperforating device may be effected in a manner somewhat resembling the control of case-shift, three selectors, Fig. 4 (not shown), being utilized.