Patent GB-700723-A (GB)
Title: Improvements in or relating to printing telegraph apparatus
Inventor: SALMON REGINALD DENNIS
IPC: H04L12/06
Filed: 1951-09-27
Abstract: 700,723. Type-printing telegraphy. CREED & CO., Ltd. Sept. 27, 1951, No. 22581/51. Class 40 (3) Page - printing telegraph apparatus comprises means operative in response to one or more distinctive signals of a first kind to move the paper on which printing is effected into a predetermined position, means normally operative in response to a distinctive signal of a second kind to release an answer-back transmitter, and means operative when said second distinctive signal is received after said first distinctive signal or signals and before the paper has been moved into said predetermined position to delay the release of the answerback transmitter until the paper has been moved into said position. On the reception of the form-feed signal, the function bar 3 moves inwardly and places an extension 8 in operative position relative to a bail-member 12 carried on a shaft 13 which is oscillated by a cam 23 carried on a shaft 22 normally released for one revolution by a ratchet and pawl clutch and a detent 16 operated by a cam 15 on the translator cam-shaft 14. When the lever 8 is rocked by the bail 12, a pin 10 rocks a pivoted plate 11 carrying an extension 33 engaging a step 34 of a three-armed member 35 having an arm 37 which is rocked by a lever 38 after a vertical bail 42 has passed a projection 43. The shaft 13 carries a toothed segment 44 engaging a pinion 45 carrying a cam 47 provided with a pin 48 which at the end of half a revolution engages an arm 49 on a pivoted latch member 50 to remove a hook 53 from an extension 54 of a four-armed lever 55 so that a roller 58 on the arm 57 is engaged with the cam 47 and a rod 60 engages a pivoted lever 62 and a sensing lever 68 which seeks an aperture 71 in the paper. If the seeker 68 is opposite the hole 71, it has additional movement into the groove 72 and when the roller 58 engages the lowest part of the cam 47 an extension 75 on a lever 74 engages under a step 77 of a pivoted plate 78 carrying an arm 81 engaging under a step 82 on the lever 35. During the final part of the rotation of the cam 47 the lever 55 is rocked so that extension 75 engages under the step 77, rocks the member 78 and returns the three-armed lever 35 to the position in which it is latched by the extension 33 of the lever 11, and the lever 38 is raised so that subsequent movement of the bail 42 does not engage projection 43 of lever 38. When, after positioning the paper, a line-feed signal is received, a lever 93 is released so that a projection 96 is engaged by a bail 95 on the shaft 13 and a feed pawl 97 moves to engage a ratchet 99 on the shaft 92 of the platen 70. A rod 100 on the lever 93 engages the lever 74 to release the pivoted plate 78. If the hole 71 has not been detected by the seeker 68, the step 77 in the plate 78 is not engaged by the arm 75 and during subsequent line-feed signals sent manually or automatically, the vertical bail 42 engages this projection 43 and by means of a feed-pawl 88 rotates the ratchet 91 on platen shaft 92 until the seeker 68 finds the hole 71. The seeker 68 is withheld from operation except in response to the form-fed signal by a rod 101 engaged by an arm 102 on the three-armed lever 35. The answer-back operation is prepared by the figureshift signal which allows lever 5, Fig. 2, to rotate and by means of pins 105, 106 to bring a projection 108 on a lever 107 into operative position with respect to a bail 109 on the shaft 13. The downward movement of lever 107 rocks a lever 111, and an arm 113 on a shaft 114 carrying a lever 115 normally engages a step 117 on a fixed member 118. When the shaft 114 is rocked it slides horizontally so that the lever 115 engages a step 120 and a lever 123 is placed above an extension 124 on a lever 125 having an extension 135 engaged by the lower end of a lever 130. Normally when the answer-back function bar 4 moves to the right the lever 130 follows and the subsequent movement of the lever 133 on the shaft 13 engages a projection 132 so that the downward movement of the lever 130 rocks lever 125 and its extension 124 rocks shaft 114 so that the extension 121 of lever 115 rocks lever 122 carrying a pawl 139 engaging a ratchet wheel 141 on the shaft 142 of the answerback drum, with the result that an actuating pawl 143 driven by a transmitting cam sleeve (not shown) is brought opposite teeth of the ratchet instead of its normal engagement with a blank-tooth sector 144. The drum is provided with the usual wards and notches and the shaft 114 together with its levers 113, 115 and 123 is reset by the transmitter shaft. If the seeker 68 has not found the hole 71 in the paper, the lever 11, Fig. 1, is not returned to its normal position and a further lever member 145 is retained in its clockwise position so that the end of a bar 148 is opposite the upper end of the lever 130 and prevents it from following the movement of the answer-back function lever 4. Also in order that the function cam sleeve 22 can make the necessary revolutions to feed the paper, the movement of the answer-back lever 4 by means of a pivoted catch 153 rocks a lever 158 and disengages its lower end from a ledge 162 on a lever 163 which moves clockwise. When the shaft 17 carrying the detent 16 is rocked, a slidable rod 167 is moved downwardly and is latched by the member 163 so that lever 170 and shaft 17 are held in the clockwise position and the shaft 22 carrying the cam sleeve 23 is not arrested before the seeker 68 finds the hole in the paper and lever 11 is restored to its normal position in which the end of the lever 148 is opposite the cut-away position 151 of the lever 130 which moves inwardly and is subsequently depressed by the bail 133 to release the answerback. Also, the lever 163 is rotated and the lever 158 is freed to rest against the projection 162 and the further downward movement of lever 125 engaging a projection 165' on the lever 163 rocks the latter clear of the projection 171 on bar 167 and engages its projection 162 under the lever 158. If the function lever 4 is rejected before form-feeding has been completed and the answer-back drum released, the cam sleeve 23 would rotate continuously. To avoid this difficulty, the lever 4 in its outward movement rocks an extension 175 of a lever 173 engaging a ramp 178 on the lever 163 in its operative position so that the latter is rocked counterclockwise to be latched under the lever 158 in the position in which it no longer prevents the arrest of the function cam sleeve 23. Specifications 620,682 and 644,850 are referred to.