Patent GB-421227-A (GB)
Title: Improvements in and relating to telegraph receivers
IPC: H04L17/24
Filed: 1933-11-29
Abstract: 421,227. Printing-telegraphs. FULD & CO. TELEPHON-UND TELEGRAPHENWERKE AKT.-GES., H., 136, Mainzerlandstrasse, Frankfort-on-Main, Germany. Nov. 29, 1933, No. 33508. Convention date, Nov. 30, 1932. [Class 100 (iv)] [See also Group XL] Relay type-wheel actions; case-shift mechanism; hammer-impression arrangements.-A printing- telegraph receiver has two or more groups of selecting-members, and successive signals control different groups for carrying out the printing or similar operation. The printing operation is carried out for a group which has been adjusted in accordance with the previous signal, whilst another group is being set by the incoming impulses of the succeeding signal. Two groups A, B of selecting-members I ... V, I<1> ... V are associated with two pairs e, f and g, h of rotatable notched discs in which the notches are arranged circumferentially and co-operate with circumferentially arranged feeler-levers which are selectively movable by the received impulses in the axial direction of the code discs, as described in Specification 436 /82, [Class 40]. Selection is effected when all the feeler-levers of the member A or of the member B fall into notches of the rings e, f or g, h respectively. The start impulse deenergizes the receiving-magnet 111, and an arm 134 carried by the armature engages the end of a pivoted detent-lever 138 so that its other end 140 is raised clear of a stop 108 on a sleeve 107 which couples the shaft 105 to the wheel 103. The shaft 105 carries an arm 114 which is moved axially in accordance with the received signals, and selectively engages the feelerlevers to move them axially. After the setting of the members I ... V or I' ... V and the printing operation by the opposite set of members have been effected, a cam 141 rotatable with the shaft 105 moves the tooth 150 of the frame R<1> or R<11> from engagement with the wheel 152 and allows the member A to rotate on the spindle 145 when all the feeler-levers engage recesses in the discs e, f with inward movement of the frame R<1> and its tooth 150 to engage a tooth of the wheel 152 corresponding to one of the thirty-two positions of the typewheel. During the positioning of the typewheel by the feelers A, and the printing operation, the cam 141 holds the member B and its associated feelers away from the discs g, h. Each of the frames R<1>, R<11> carries a lever 154 which during the inward movement of the frame engages a projection 163 on a pivoted frame 155 and raises the end 160 which engages a pivoted latch-member 133 normally holding the pivoted type-hammer 119 against the action of its spring 122. The operative end 164 of the type-hammer lever 119 is engaged by a spring 165 formed at the end of a pivoted member 127 with a bent lever 166 co-operating with teeth 129 and depressions 128 on a continuously rotating wheel 125. When the arm 166 falls into a recess 128, the hammer 167 is able to move forward under the action of the spring 122 to strike the selected type-element against the tape P. When a function signal, such as figure-shift or letter-shift, is received, the typewheel shaft 115 is rotated to a position such that the end of a pivoted lever 169 falls into a notch of a cam disc 168 on the shaft 115 and an arm 173 is raised to a position in which it latches the end 174 of the lever 127 against movement, thus preventing the operation of the printing-hammer 167. For the printing of figures, a notch in an additional disc 175 is engaged by a lever 177 having an extension 180 which removes a detent 182 from a pivoted member 186 which on release engages with a friction drum 187 secured to the type-wheel. The drum 187 is driven from the type-wheel shaft 115 by a spring 200 engaging an arm 202 secured on the drum. When friction is applied to the drum 187, the type-wheel lags behind its normal position on the shaft 115 by 1/64th of its circumference as determined by the position of a driving-pin 201, and figures or symbols are printed instead of letters. When the lettershift signal is received, a projection on a cam disc 176 engages a pivoted rod 188, the end of which now engages the end of a lever 192 moving the lever 186 from the drum 187 to its normal position in which it is latched by the member 181. The lever 177 is prevented from falling into the notch of the disc 175 during its rotation until the frame R<1> or R<11> moves inwardly and through lever 153 or 198 moves the bar 193 outwardly. The type-wheel may be used as a stroboscopic speed indicator for the receiver as described in Specification 417,425. Specification 3096/75, [Class 40], also is referred to.