Patent GB-399185-A (GB)
Title: Improvements in or relating to code telegraphic type-printing apparatus
IPC: H04L17/00
Filed: 1931-12-24
Abstract: 399,185. Type-printing telegraphy. TREML, L. I., Novinsky, Boulevard 16, Moscow. Dec. 24, 1931, No. 29662. [Class 40 (iii).] In a type-printer in which the type-wheel shaft rotates continuously, signals are registered by pins which are axially movable in a rotating drum and control the setting of decoding rings which have internal notches for selecting a letter and external notches for effecting case-shift. Transmitter. Each key depresses a combination of the selector plates 9 which move to the right in consequence of the pin-andslot arrangement 3, 3. The selector plates act through levers 5 to break the normally existing contact between the plate 13 and spring contacts 4 ; and further, through push-rods 22 and levers 6, to release the latch 24 and permit the brush-arm 17a to make one revolution, during which a combination of signals, set up on the contacts 4, is sent to line through the distributor 12. The rod 22 passes under the end of the lever 6 and so permits stoppage of the brush 17a at the end of a revolution in spite of the key being held down too long. If the key is released too soon, the levers 5 are nevertheless held operated by a latch 8, which is restored at the end of the revolution by a cam-operated rod 21. Receiver: selector and printer mechanism. On being de-energized by the start signal, the line magnet 26, Fig. 4, at the receiver acts through the parts 30, 29 to release the combiner drum 31 for one revolution. This drum has frictional engagement with the driving-shaft 19, but when it begins to move the engagement is rendered positive by the action of a pawl. The drum 31 has five axially displaceable selector rods 31a, Fig. 9, which after being, in the course of a revolution, reset by a fixed cam into their spacing positions, reach a bevelled cam surface 28a, Fig. 4, on the armature lever 28 and are set to their marking positions, or not, according to the signal impulse then affecting the electromagnet 26. During the further rotation of the combiner 31, the fingers 31b of the selector rods 31a set the decording ringe 40a, Figs. 6 and 10, to the required signal combination by selectively engaging projections 40 thereon. The decoding rings 40a have code notches on their inner surfaces for selecting the characters to be printed, and on their outer surface for effecting case-shift and for momentarily locking the combination by means of a locking strip 45, Fig. 2 (not, shown). A seeker 65 is adapted to slip into the inner notches when these are aligned and into a notch in the cover 39, which has notches for all alignments, so that the shock is taken by the cover and not by the decoding-rings. The guide 66 of the sliding seeker 65, Figs. 6, 7 and 8, rotates with the type-wheel shaft 32, on which it is loosely mounted, and is connected by links 66a, 66b, to a part 67a which is keyed to the shaft. When the seeker and slide 65, 66 stop, the part 67a goes on, the links 66a, 66b straighten out, and the link 66a extracts the seeker 65 from its slot. The momentary stopping of the guide 66 causes, by cam action, an axial displacement of a sleeve 37b which acts through a lever 59 to effect printing (by actuating the printing-hammer 38, Fig. 3, through the link 70), tape-feed (by lifting the lever 60, Fig. 3) and unlocking of the decoding- rings (by lifting the lever 50 and so withdrawing the locking strip 45, Fig. 2 (not shown), referred to above). Case-shift. The notches for the case-shift combination are on the exterior of the decoding- rings 40a, and can form three combination grooves corresponding to three axial positions of the type-wheel. When one of three seekers enters one of the grooves, an extension 42, Fig. 4, of the seeker lifts a corresponding one of three plates 53 into the path of a rotating tappet 35 which presses it against one of three catches 54, pushing this latter into the path of a cam 36. The tail of the operated catch depresses the spring plate 58 and so releases the previously engaged catch ; the tail of the newly-engaged catch then takes into the notch in the plate 58. The cams 36 being in different planes, viz. the planes of the corresponding catches, the disc 56a thus rotates through 90‹ ; but two of the cams 36 are in the same plane and co-operate with the same one of the three catches. The disc 56a is connected through an eccentric-and-universal-joint mechanism 61a, Fig. 1 (not shown) to a forked lever for shifting the type-wheel' shaft axially. The decoding- rings 40a, Fig. 3, have then to be unlocked by the release of the locking strip 45, Fig. 2 (not shown). This is effected by the strips 53 acting through the parts 63, 50b, Fig. 4; 50c, Figs. 3 and 4, and 50a, 50, Fig. 3. Driving and mounting. The type-wheel is driven non-stop at a speed 1<1>/6 times that of the transmitter shaft. The parts are readily dismountable. An electric governor of known type is employed.