GB604030A - Improvements in photo-electric telegraph transmitters - Google Patents
Improvements in photo-electric telegraph transmittersInfo
- Publication number
- GB604030A GB604030A GB31357/45A GB3135745A GB604030A GB 604030 A GB604030 A GB 604030A GB 31357/45 A GB31357/45 A GB 31357/45A GB 3135745 A GB3135745 A GB 3135745A GB 604030 A GB604030 A GB 604030A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- tape
- light
- slots
- message
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
- H04L17/02—Apparatus or circuits at the transmitting end
- H04L17/12—Automatic transmitters, e.g. controlled by perforated tape
- H04L17/14—Automatic transmitters, e.g. controlled by perforated tape with optical sensing means
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
604,030. Automatic control systems. TELETYPE CORPORATION. Nov. 21, 1945, No. 31357. Convention date, June 15, 1944. [Class 38 (iv)] [Also in Group XL (b)] In a photo-electric telegraph transmitter, message-tape feeding mechanism and scanning mechanism therefor are automatically maintained in phase as a result of scanning control marks on the tape. Fig. 5 shows an exploded view of three concentric cylinders 42, 48, 52 of a photo-electric telegraph transmitter, similar to that described in Specification 472,728, [Group XL]. As in that Specification, a radial beam of light from a source outside cylinder 52 is directed towards the axis of the cylinders and a photo-electric cell is responsive to light reaching the inside of cylinder 42. A message tape bearing a printed five-unit code moved tangentially to cylinder 52 which is rotated so that slots 56 in it, in turn, register with successive lines of the code marks on the tape as they pass through the light beam. Cylinder 48 is geared to cylinder 52 so that it rotates once for a movement of cylinder 52 corresponding to the distance between adjacent slots 56, and slots 50 scan the individual units of the message code. Cylinder 42 is stationary and slots 46 serve to transmit, to the photocell, light resulting from the message scan. The use of light conducting rods to permit convenient location of the photocell is described. Slots 54 in cylinder 52 co-operating with slot 49 in cylinder 48 and slot 44 in cylinder 42 serve to scan starting impulses. The modification according to the invention, is the provision of equally spaced control marks near one edge of the tape and corresponding slots 57 on cylinder 52 so that when correct relative phase obtains between the tape and cylinder 52 no light is transmitted through slot 47 of cylinder 42 to a second photocell 64, Fig. 6. Transmission of light to this cell under out-of-phase conditions, however, energizes through a thermionic valve amplifier-oscillator including valves 132, 139, a relay 119, to operate a clutch 107 and disconnect a friction drive 105 to a tape feed roller 66 and, if necessary, apply friction brake 114 to slow down the feed, which would be otherwise fast, until the relative phase is corrected. In Fig. 6, photocell 63 is that influenced by the message code and operates a relay 153 through a thermionic valve amplifieroscillator to transmit the message impulses over line 157 to a printer at a distant station.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US540456A US2397202A (en) | 1944-06-15 | 1944-06-15 | Photoelectric transmitter synchronizer |
Publications (1)
Publication Number | Publication Date |
---|---|
GB604030A true GB604030A (en) | 1948-06-28 |
Family
ID=24155535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31357/45A Expired GB604030A (en) | 1944-06-15 | 1945-11-21 | Improvements in photo-electric telegraph transmitters |
Country Status (2)
Country | Link |
---|---|
US (1) | US2397202A (en) |
GB (1) | GB604030A (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL67048C (en) * | 1945-02-14 | |||
US2455443A (en) * | 1945-10-12 | 1948-12-07 | Rca Corp | Secret radio signaling system |
US2724183A (en) * | 1945-12-27 | 1955-11-22 | Calibron Products Inc | Remotely controlled precision drive and calculating systems |
US2540287A (en) * | 1947-06-04 | 1951-02-06 | Teletype Corp | Printing telegraph system and apparatus |
US2565266A (en) * | 1947-06-20 | 1951-08-21 | Teletype Corp | High-speed photoelectric transmitter |
US2625300A (en) * | 1948-03-22 | 1953-01-13 | Conveyor Company Inc | Automatic dispensing machine with electric lights for controlling same |
US2688049A (en) * | 1951-02-27 | 1954-08-31 | Ferranti Ltd | Signal-receiving apparatus |
US3056947A (en) * | 1952-03-31 | 1962-10-02 | Sperry Rand Corp | Information translating apparatus |
US2867759A (en) * | 1954-07-12 | 1959-01-06 | Norton Co | Servomotor control system adapted for machine tool use |
US3104324A (en) * | 1957-11-22 | 1963-09-17 | Rabinow Engineering Co Inc | Electro-optical scanning system for reading machines |
US3173018A (en) * | 1961-11-09 | 1965-03-09 | Rca Corp | Fiber optic load positioner |
US3562541A (en) * | 1968-06-28 | 1971-02-09 | Neotec Corp | Synchronizing light chopper comprising cylindrical disc with plurality of channels |
-
1944
- 1944-06-15 US US540456A patent/US2397202A/en not_active Expired - Lifetime
-
1945
- 1945-11-21 GB GB31357/45A patent/GB604030A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US2397202A (en) | 1946-03-26 |
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