Patent GB-763125-A (GB)
Title: Machine for converting telegraphic characters
Inventor: JENSEN KAJ LEO
IPC: H03M7/40
Filed: 1954-08-27
Abstract: 763,125. Electric telegraphy. STORE NORDISKE TELEGRAF-SELSKAB AKTIESELSKAB. Aug. 27, 1954 [Jan. 30, 1954], No. 25000/54. Class 40 (3). In telegraph apparatus for converting five-unit code signals perforated in a tape into perforations corresponding to the character in an unequal length code in another tape and in which sensing mechanism comprises five fingers for sensing the perforations in the tape and a sixth finger detects a non-perforated area of the tape and serves to stop the apparatus when the tape breaks or is exhausted, a mechanism is provided so that the operation of the machine is maintained by the reciprocating movement of the stop finger for a predetermined time after the failure of the tape until the final character punched in the unequal length code has emerged from the duct guiding the tape through the punching and feeding mechanism. The apparatus for sensing the perforations in the incoming tape and effecting the operation of the sets of combination bars controlling respectively the punching of the tape and the variable feeding action is similar to that described in Specification 763,124. The five fingers 58 with pins 74 for sensing perforations and the sixth finger 60 with a pin 76 for directing the absence of tape are biased upwardly by springs and are moved downwardly by a bail 62 carried on a shaft 66 secured to an arm 68 rocked by a link 70 from a cam on a sleeve connected by a clutch to a shaft driven by the operating motor. The sensing fingers 58 carry lateral lugs 78 supporting the ends of five U-shaped members 80 mounted on a bar 82 carried by a frame 86 and having their other ends operatively associated with projections 84 on selection bars 54 which determine the setting of the two sets of combination bars controlling the punches and the tape feed. When the incoming tape fails, the finger 60 is able to move upwardly and downwardly and rocks a lever 94 carrying a pawl 98 to step a ratchet-wheel 100 on a shaft 102 carrying a cam 104 which in its initial movement allows a lever 134 to move inwardly and place fingers 138 in blocking relation with respect to extensions 140 on the 1st, 2nd, 4th and 5th fingers so that solely the 3rd finger 58 and the stop finger 60 are free to rise when the bail 62 is rocked upwardly. The upward movement of the third finger produces the spacing operation and the movements of the finger 60 effect stepping of the ratchet 100 and rotation of the shaft 102 carrying a disc 108 with a notch 110. A lever 114 having a tooth 112 carries a plate 118 abutting the end of a lever arm 120 and engaging one limb of a U-shaped member 122. When the notch 110 is opposite the tooth 112 and the arm 120 has been rocked clear of the plate 118 to allow the fingers 58, 60 to rise, the lever 114 moves upwardly and rocks the member 122 so that its vertical arm 126 allows a lever 128 to rotate a shaft 130 carrying a latch 132 which operates to disconnect the cam sleeve 18 from the driving shaft 16. The final revolution of the cam sleeve operates the finger 60 and lever 94 so that the final step of the ratchet brings the nose 106 of the cam 104 opposite the end of the lever 134 and the tooth 112 into engagement with the non-recessed portion of the disc 108. Secured to the driving shaft 16 is a ratchet wheel 146 engaged by a triangular pawl 156 carried by an eccentric disc 148 secured to the sleeve 18. The tooth 158 of the pawl is urged into engagement with the ratchet 146 by a spring 164 attached to a tubular extension 150 with a recessed portion 152 adjacent the nose 162. One arm of a bent lever 168 carries an adjustable screw 172 engaging the periphery of the disc 148 so that the end of the other arm is normally moved out of the path of the nose 160. The upward movement of the latch 132 is arranged to be effected after the nose 160 has passed the end of the horizontal arm of the lever 168 which is latched so that it cannot undergo its normal clockwise movement and the end of horizontal arm engages the nose 160, rocking the nose 158 out of engagement with the ratchet 146 and the nose 162 into engagement with the recess 152 to arrest the sleeve 18. Specification 191,093, [Class 31 (ii)], also is referred to.