Patent GB-1420220-A (GB)
Title: Facsimile stations
IPC: H04N1/00
Filed: 1972-12-07
Abstract: 1420220 Data transmission systems; facsimile station; automatic exchange systems ADDRESSOGRAPH MULTIGRAPH CORP 7 Dec 1972 [8 Dec 1971] 56636/72 Headings H4P H4F and H4K In a facsimile station comprising a copying mechanism 24, 18, Fig. 1, for receiving or transmitting video signals and having a plurality of control functions to enable the reception or transmission of the video signals; a plurality of programs 38, 37a-37d are stored and each is selectable for presentation to a program controlled digital processor 16 to provide a different mode of operation of the processor in exercising control over the control functions of the copying mechanism 24, 18 and over the transfer of video signals between the copying mechanism and a terminal 14 by which connection can be made with a remote facsimile station. The processor 16 which can be a computer can be programmed by a read only memory card 39 applied at 40 or by a tape cassette 37a-37d selected from 38 and applied to a tape reader 36. Each tape 37a-37d is magnetized with one or more predetermined facsimile control programs such as different coding schemes, scan and print sequencing and diagnostic test programs. A telephone link is also provided between stations by a telephone handset 34. Indicators and controls subsystems 32 includes a lamp matrix (89a, Fig. 1c, not shown), an image matrix (89b), a lens matrix (89c) which project indications on a projection screen (90) and a control switch (91) operated by pushing on the screen (90). A buzzer alarm (94) is activated when an alarm condition exists. The scanner 18, analog circuits 20 and scan relay 22 are shown in detail, Fig. 1A. The scanner 18 includes a stepping motor drive system 45 and paper feed motor 43 for feeding a document 42 to be scanned by a photo-electric detector 47. The photo-electric detector 47 is coupled to a light pipe 46 and scans the document 42 in response to a moving spot scanning system 48- 54 including a mirror galvanometer 49. Photoelectric detectors 55, 56, 57 detect the position of the document. A video processor 61 in the analog circuits 20 provides a digital output at 3.4, 3.5 to the program controlled processor 16. The scan relay 22 includes reed relays 44a and has switches 58, 56, 60 (i) preventing feed of document 42 through the scanner, (ii) facilitating facsimile reproduction of the document being scanned locally at the printer 24 and, (iii) causes incremental advance of document respectively. The printer 24, print relay 30, marker assembly 28 and analog circuits 26 are shown in detail Fig. 1B. The printer 24 has a stack of zinc oxide paper 64, a sheet of which is fed through electrostatic charging plates 66 by a drive mechanism 65 to a belt and roller system 67 driven by motors 68, 69 so that the photosensitive charged surface of the paper is scanned by the photo-electric printer. The printer includes X and Y galvanometers 83, 81, X and Y scanning mirrors 82, 80, a lens system 79 and a laser 78 fed with light modulated signals from the marker assembly 28. The paper is developed in developer 70 which can include liquid toning and subsequent drying. A detector 71 detects that the printer is out of paper, a detector 73 detects the position of the paper and photo-electric detector 75 detects exit of the paper. (For Figures see next page.)