GB819703A - Improvements in or relating to mechanical scanning systems for facsimile recording apparatus - Google Patents
Improvements in or relating to mechanical scanning systems for facsimile recording apparatusInfo
- Publication number
- GB819703A GB819703A GB2131257A GB2131257A GB819703A GB 819703 A GB819703 A GB 819703A GB 2131257 A GB2131257 A GB 2131257A GB 2131257 A GB2131257 A GB 2131257A GB 819703 A GB819703 A GB 819703A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scanning
- scanning elements
- carrier
- elements
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
- H04N1/16—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning using a rotating helical element
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Electronic Switches (AREA)
Abstract
819,703. Facsimile records. MUIRHEAD & CO. Ltd. April 16, 1958 [July 5, 1957], No. 21312/57. Class 40 (3). Facsimile recording apparatus comprises a plurality of scanning elements each of which, in turn, effects a line scan on the record sheet. In the described embodiment, which is concerned with two scanning elements, the latter consist of semicircular blades 11 and 12 (Fig. 1) the former being mounted for translatory movement along guides 17, 18 and the latter for similar movement along guides 19, 20 (see Fig. 3). The four guides are attached to end plates 21, 22 the whole forming a carrier which is rotated about axis 25 via a hollow shaft 24, gears 32, 35, 34 and a shaft 37 the speed of which is synchronized to the scanning at the transmitter by known means. Also mounted for rotation about axis 25, via shaft 27, gears 33, 36 and shaft 37, and inside the carrier is a drum 26 the surface of which is provided with two helical grooves 41, 42 of left-hand and righthand progression respectively the start ends of which merge smoothly into each other and each of which (in the case of two scanning elements) consists of one and one half turns extending over a distance equal to the length of a scanning line. Each scanning element is provided with means 27a, 28 which engage the grooves so that relative motion between the drum and the carrier causes the scanning elements to slide along the guides the gearing being such that during the period of one line scan the carrier and scanning elements make one half revolution, in one direction, whilst the drum makes a complete revolution in the opposite direction. In operation the received signals are supplied between the scanning elements (the edges of which are provided with a suitable facing material when an electrolytic recording is to be made) and a transverse electrode (writing bar) 38 spring urged towards the elements which, initially, are positioned at opposite ends of the carrier. The record sheet is fed by known means between electrode 38 and the scanning elements so that, whilst one of the latter is effecting a line scan by rotatory and translatory movement, the other element is being returned to the start preparatory to commencing the scanning of the next line. The scanning elements although substantially semicircular are however of such arcuate length that there is just sufficient clearance to allow them to pass each other when moving in opposite directions and, to prevent the electrode 38 from moving forward (due to its spring urging) and jamming the mechanism when one element is breaking contact and the other about to make contact, the end plates 21, 22 are provided with ramps 39, 40 of sufficient height to limit such movement. Instead of effecting an electrolytic recording the apparatus may be employed for producing a recording by indenting the record sheet the scanning elements in this case forming anvils and the electrode 38 acting as a hammer. More than two scanning elements may be employed the peripheral length of each of the latter and the length of the grooves being suitably proportioned.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2131257A GB819703A (en) | 1957-07-05 | 1957-07-05 | Improvements in or relating to mechanical scanning systems for facsimile recording apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2131257A GB819703A (en) | 1957-07-05 | 1957-07-05 | Improvements in or relating to mechanical scanning systems for facsimile recording apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB819703A true GB819703A (en) | 1959-09-09 |
Family
ID=10160746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2131257A Expired GB819703A (en) | 1957-07-05 | 1957-07-05 | Improvements in or relating to mechanical scanning systems for facsimile recording apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB819703A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110500941A (en) * | 2019-08-27 | 2019-11-26 | 成都宏明电子股份有限公司 | A kind of straight-line displacement magneto-dependent sensor of RS485 linear convergent rate |
-
1957
- 1957-07-05 GB GB2131257A patent/GB819703A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110500941A (en) * | 2019-08-27 | 2019-11-26 | 成都宏明电子股份有限公司 | A kind of straight-line displacement magneto-dependent sensor of RS485 linear convergent rate |
CN110500941B (en) * | 2019-08-27 | 2024-05-14 | 成都宏明电子股份有限公司 | Linear displacement magneto-dependent sensor with RS485 linear output |
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