Patent GB-794432-A (GB)
Title: Improvements in or relating to type-printing telegraph apparatus
IPC: H04L13/06
Filed: 1955-03-03
Abstract: 794,432. Typewriters: feeding sheets HANDLEY, J. March 2, 1956 [March 3 1955], No. 6249/55. Classes 100(1) and 100(4) Printing apparatus comprises a tubular support about which a sheet of paper can be positioned, means for printing characters in a line along a circumference of said tubular support and means for effecting a line feed operation along the axis of the tubular support. Means are included for paper feed and ejection. Pile tables. Sheets of paper on plate 9 (Fig. 4) are lifted by racks 10 and 11, and gears 14, and 15, when handle 12 (Fig. 1) is turned manually. Pawl 21 and ratchet wheel 16 retain the table in the raised position. As paper is used. plate 9 is raised by feed pawl 22 and ratchet wheel 16. operated by rocker 23, which is pivoted about shaft 13, and in spring-urged contact with cam 24. Thus, pawl 22 attempts to raise the stock of paper every time shaft 6 revolves. If the stack of paper is high enough, feed pawl 22 is disengaged by rockers 28 and 27 linked by rod 137, rocker 27 being raised by the pressure of the stack of paper against member 36 and guide member 25. Plate 9 is lowered on to blocks 20 by depressing trigger 29. Sheet separators. A tubular paper feed member 36 runs in slots 19. The top sheet of paper is held in contact with a longitudinal slit in member 36 by suction, produced by cam-operated pump 138. Member 36 is moved along slots 19 towards the paper support by arms 40 and 41, which turn clockwise about shaft 39 under the tension of spring 139 acting on arm 38. The extent of movement is controlled by cam 37 and cam-follower 26. The paper is inserted between cylinders 42 and 43 until the edge is in contact with rollers 44 and 45. Member 36 now releases the paper, due to the suction being equalized through valve 56, opened by lever 55 and screw 57. Arms 40 and 41 and feed member 36 are returned to the rest position by cam 37. Platten and feed roller rotation. When the edge of a sheet of paper touches wheels 44 and 45 (Fig. 4) which bear on cylinder 43, they revolve, driven by shaft 49. Synchronization is effected by roller 30 (Fig. 3) being pushed out by its cam and closing contacts 66, thus operating relay 46. Rollers 69, 70, 71 and 72 are also driven by shaft 49. Rollers 71 and 72 urged by springs 73 and 74 co-operating with bracket 141 press cylinder 43 against rollers 44, 45, 69 and 70, so that as all these rollers rotate, paper is fed on to cylinder 43. Paper ejection is carried out by rollers 44, 45, 69, 70, 71 and 72. The paper is rotated under control of relay 46, until the rear edge is opposite aperture 96. Relay 80 now operates causing pawl 82 to release escapement wheel 81 when the paner is ejected on to plate 97 by the above rollers rotating in the reverse direction. Hammer impression arrangements. Type, composed of groups of printing wires, as described in Specification 789,742 is selected by relay 58 and set up at 59. the paper being struck against the type by hammer 60, under the control of clutch 132. Spacing and tabulating mechanism. When hammer 60 strikes the paper, arm 126 (Fig. 5) lifts pawl 61 out of engagement with escapement wheel 62, and the paper is fed round one position ready for printing the next character. At the end of each line, line feed relay 98. (Fig. 1), is operated, and its armature releases escapement wheel 84. When wheel 84 is released a clutch engages, and gear 92 drives differential 85, and the gear wheel 86 mounted on its shaft. Gear wheel 86, which engages with carriage feed rack 87, turns. and the carriage is traversed to the next line position. The carriage is fully returned after the last line is printed, this being effected by gears 88, 94, 93, and differential 85 through a friction clutch which engages when escapement wheel 95 is released at the end of the last line of a page. Tabulating is controlled by a tabulating distributor wiper 51 (Fig. 1), driven by gears 52 and 53 from differential 50. Wiper 51 traverses over distributor 54 as the paper is moved over the surface of cylinder 43. Strip controlled apparatus, and recording readings from calculating machines. The printer can be used in conjunction with a computor or perforated tape reading device. Line feed, carriage return, and loading and unloading signals could be received from the computor, also when printing from perforated tape, a contact on the distributor can be arranged to operate line feed relay 98 when the paper has been rotated to a given position on cylinder 43.