Patent GB-1072073-A (GB)
Title: Improvements relating to drum type facsimile receivers
Inventor: HOER KENNETH GEORGE
IPC: H04N1/06
Filed: 1965-04-28
Abstract: 1,072,073. Facsimile receivers. MUIRHEAD & CO. Ltd. Nov. 22, 1965 [April 28, 1965], No. 17951/65. Heading H4F. Operation of the limit switch (S4, Figs. 5 and 6) by the optical carriage (OC) at the end of the recording scan of a facsimile receiver initiates de-clutching of the drive from a high-speedmotor (HSM) to the drum (5a) and to the carriage via respective clutches (DC) (TC) and energizes an electromagnetic brake (18), (also Figs. 1 and 2), together with a clutch (CR) which couples the optical carriage to a lowspeed-motor (LSM) and when the drum has come to a halt, rotates the drum at the lower speed to a reference position at which the recording paper on the drum may be unloaded. The slow-speed rotation of the drum is effected via shaft (1), (Fig. 1), to a pulley (2) on which the motor LSM is belt coupled, the shaft driving a bush (6) carrying a gear (7) via a spring-urged latch arrangement (4a ... 4c) cooperating with a toothed bush (4) keyed to the shaft and the gear (7) meshing with a gear 8 (also Fig. 2) which drives the drum-shaft 5 via a further latch arrangement (10 ... 13), (also Fig. 3). The housing of the electromagnetic brake (18), (Fig. 1 and 2), is rotatably mounted such that during braking the reaction causes a projection 21 carried thereby to abut against a stop (22) and then, under the action of spring (23) to abut against stop (22a) this rotatory movement operating via a link (24) and lever (27) (see also Fig. 2a) to allow shaft (1) to drive gear (7) for one revolution. Two gaps are provided in the teeth of gear (7) and, allowing for such gaps, one revolution produces three revolutions of gear (8). During the first revolution lever (10) of the latch arrangement searches for arm (11) keyed to shaft (5), and having engaged it, rotates the drum to the reference position at which the paper unloading commences, which unloading takes place during the second rotation of the drum. Just before the end of this second revolution a switch (S7, Fig. 4) operated by a cam assembly, carried by bush 6 switches on a paper-feed clutch (PFG, Fig. 5) and at the end of this revolution drum (5) stops for a time determined by the first gap in the teeth of gear (7) a detent arrangement (31, 32, 33, Fig. 2) holding it in a fixed position. During this stop fresh (photographic) paper is delivered from a supply roll and during the third revolution this paper is wound around the drum whilst the previous sheet of paper is released and fed to the processor unit for developing and fixing. Before the end of the third revolution the drum stops for a time determined by the second gap in the teeth and whilst it is retained in a second fixed position by means (31, 32, 33) a guillotine operated by a cam cuts the new sheet which is then secured on the drum during the remainder of the third revolution. The drum now stops, but the motor (LSM) continues to drive a cam (C6), which makes one revolution in 27 seconds, whilst the processing of the unloaded sheet takes place until operation of switches (S6a), (S6b) by cam (C6) bring the cycle to an end by deenergizing motor (LSM). The high-speed motor is now clutched-in and a fresh recording cycle commences.