Patent GB-476970-A (GB)
Title: Improvements in or relating to mechanisms for feeding transfer material (e.g. carbonpaper) to typewriters or other recording machines
IPC: B41J17/00
Filed: 1936-06-20
Abstract: 476,970. Typewriters &c. STANDARD REGISTER CO., SHERMAN, J. Q., and METZNER, A. W. June 20, 1936, No. 17216. [Class 100 (iv)] Ink-ribbon mechanism ; web feeding and guiding arrangements.-In a typewriter or other recording-machine employing transfer-material such as carbon paper, interleaved with paper webs and fed frictionally thereby past the writing line, mechanism normally resisting feed of the transfer-material is automatically controlled, for instance by return of the platencarriage, to permit feed of the transfer-material in accordance with the number of lines written by the machine. The mechanism avoids waste of the transfermaterial, since feed thereof does not occur when blank headings &c. on the paper webs are fed past the writing line. In the mechanism shown in Figs. 1 and 7, zigzag stationery packs and carbon-paper rolls 64 are supported by a trolly 10 which is connected by links 66 to the platen-carriage A of a typewriter and runs on rails 12. A bracket 14 supporting the rails is secured to a standard 16 having a base 18 provided with clips 20 for engaging the base of the typewriter. The carbon-roll mandrels 30 are coupled to stub-stafts 32 provided with bevel-gears 34 engaging bevel-gears 36 on a shaft 38. A pinion 40 on the shaft engages a pinion 42 which co-operates with four teeth projecting from a ratchet-wheel co-operating with a pawl on a rocking arm 54. A rod 60 in connection with the rocking arm passes through the standard 16 and is provided with a collar 62. The frictional resistance of the mechanism in connection with the shaft 38 is usually sufficient to prevent rotation thereof by the pull on the carbon-webs, but to increase such resistance, the shaft may be provided with a brake or detent which is preferably released automatically when the platen-carriage is returned. The carbon and stationery webs 28, 64 pass around the platen 70, and to facilitate threading of the webs, the platen is mounted on bellcranks 72 which can be raised about a pivot 74. A latch 92 holds the bell-cranks in normal position. The line-spacing wheel 80 and a pinion 86 on the platen-shaft gear with a pinion 84 on the pivot 74. The shaft 38 is provided with a coupling 100, 102 which is automatically released when the platen is raised by means of a bell-crank 104 in connection with a slotted link 108 engaging the platen-shaft. When the platen-carriage is returned, the rod 60 is obstructed, the shaft 38 is turned slightly, short lengths of the carbon webs are unwound from the rolls, and the platen on being turned by the line-spacing mechanism feeds the paper and carbon webs. To prevent the carbon webs from being torn by excessive tension caused by binding between the paper webs, resilient couplings may be arranged between the stub-shafts 32 and the carbon-roll mandrels 132, Fig. 9. The couplings may consist of a sleeve 116 which receives the square end of the stub-shaft and is provided with a pin engaging an incomplete annular groove 142 in a collar 136 splined to the mandrel, a spiral spring 138 being connected to the collar and a drum 134 on the sleeve 116. The spring enables the mandrel to turn more quickly than the stub-shaft, strain on the carbon webs being thereby relieved. When the binding action ceases, the carbon web is returned by means of the spring. Paper-supports.-The platen 70 may be provided at the ends with pin-wheels such as are described in Specification 408,125, the intermediate part of the platen being reduced in diameter to diminish the frictional grip on the carbon webs. To provide a flat typing- surface, a stationary plate may be arranged between the pin-wheels.