US2729818A - Facsimile apparatus - Google Patents
Facsimile apparatus Download PDFInfo
- Publication number
- US2729818A US2729818A US371488A US37148853A US2729818A US 2729818 A US2729818 A US 2729818A US 371488 A US371488 A US 371488A US 37148853 A US37148853 A US 37148853A US 2729818 A US2729818 A US 2729818A
- Authority
- US
- United States
- Prior art keywords
- helical
- electrode
- sections
- facsimile apparatus
- drum
- 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 - Lifetime
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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
Definitions
- FACSIMILE APPARATUS Filed July 31, 1953 United States Patent FACSIMILE APPARATUS John Bell, Beckenham, England, Frank H. Cannon, Chatswood, New South Wales, Australia, and Grahame Arthur Mundy, Beckenham, England, assignors to Muirhead & Co. Limited, Beckenham, England Application July 31, 1953, Serial No. 371,483 Claims priority, application Great Britain August 1, 1952 Claims. (Cl. 346-101) The invention relates to facsimile apparatus.
- This faulty electrical contact between the electrodes establishes a high resistance between the electrodes and prevents an electrical signal from properly passing between them. This condition is known as blocking.
- the helical electrode is mounted on a self-supporting helical structure.
- the helical structure may have a helical surface supported by radial arms or a radial web.
- the helical structure will, of course, be provided with appropriate centres or spindle ends on which it can rotate.
- An advantage of the construction is a reduction of weight compared with the drum, and also a reduction of inertia which eases the problem of rapid starting such as occurs when a receiver is being phased with a transmitter whose drum is already rotating.
- Figure 1 is a side elevation partly sectioned
- Figure 2 is an end view
- FIG. 3 is a detail.
- the helical structure is made of sections 1, each representing one sixth of the revolution of the helix.
- the sections are identical and are individually manufactured, for example, by die-casting. They are comprised of helical part 3 which is supported at its ends by radial arms 4 integrally formed on a hollow shaft 5.
- the sections are substantially spigoted as at 6 and are bolted together by bolts 7, or otherwise attached by known methods.
- the detail ( Figure 3) shows one method of attaching the helical electrode 2 by making this in the form of a strip of L-section and securing it by spaced screws along one limb of the L.
- the electrode might be secured by riveting or by fixing under spring or screwed clamps.
- a helical recording electrode assembly for facsimile recorders comprising a plurality of identical sections, each representing a fraction of a single revolution of the helix and each comprising a rigid helical surface, helically disposed radial parts rigidly supporting the helical surface parts and a central shaft part carrying the radial means for securing the sections in abutting relaitonship with the helical surfaces in accurate alignment and a continuous helical electrode mounted on the aligned helical surfaces.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Heads (AREA)
- Facsimiles In General (AREA)
Description
Jan. 10, 1956 J. BELL ET AL 2,729,818
FACSIMILE APPARATUS Filed July 31, 1953 United States Patent FACSIMILE APPARATUS John Bell, Beckenham, England, Frank H. Cannon, Chatswood, New South Wales, Australia, and Grahame Arthur Mundy, Beckenham, England, assignors to Muirhead & Co. Limited, Beckenham, England Application July 31, 1953, Serial No. 371,483 Claims priority, application Great Britain August 1, 1952 Claims. (Cl. 346-101) The invention relates to facsimile apparatus.
It is known in facsimile recorders to employ helical recording electrodes. Hitherto such electrodes have been mounted on a drum or on a helical support which in turn is mounted on a drum.
Moisture from the recording paper condenses on the drum and together with dust and residue from the paper will be urged against the electrode to cause portions of the helix to be insulated so that faulty electrical contact exists between the two electrodes. This faulty electrical contact between the electrodes establishes a high resistance between the electrodes and prevents an electrical signal from properly passing between them. This condition is known as blocking.
According to the invention, the helical electrode is mounted on a self-supporting helical structure. Thus the helical structure may have a helical surface supported by radial arms or a radial web.
The helical structure will, of course, be provided with appropriate centres or spindle ends on which it can rotate.
An advantage of the construction is a reduction of weight compared with the drum, and also a reduction of inertia which eases the problem of rapid starting such as occurs when a receiver is being phased with a transmitter whose drum is already rotating.
Further since only a helix is rotating there is no danger, as there may be with a drum or cylinder, of the paper contacting the moving part except at the desired point of contact.
An embodiment of the invention will be described with reference to the accompanying drawings.
Figure 1 is a side elevation partly sectioned;
Figure 2 is an end view;
Figure 3 is a detail.
2,729,818 Patented Jan. 10, 1956 In the drawings the helical structure is made of sections 1, each representing one sixth of the revolution of the helix. The sections are identical and are individually manufactured, for example, by die-casting. They are comprised of helical part 3 which is supported at its ends by radial arms 4 integrally formed on a hollow shaft 5. The sections are substantially spigoted as at 6 and are bolted together by bolts 7, or otherwise attached by known methods.
The detail (Figure 3) shows one method of attaching the helical electrode 2 by making this in the form of a strip of L-section and securing it by spaced screws along one limb of the L.
Various modifications may be made within the scope of the invention. Thus the electrode might be secured by riveting or by fixing under spring or screwed clamps.
What we claim is:
l. A helical recording electrode assembly for facsimile recorders comprising a plurality of identical sections, each representing a fraction of a single revolution of the helix and each comprising a rigid helical surface, helically disposed radial parts rigidly supporting the helical surface parts and a central shaft part carrying the radial means for securing the sections in abutting relaitonship with the helical surfaces in accurate alignment and a continuous helical electrode mounted on the aligned helical surfaces.
2. A supporting structure for a helical electrode for facsimile recorders as claimed in claim 1, in which the sections have spigots at one end and corresponding sockets at the other and adjacent sections are secured together by spaced bolts extending in the axial direction around the spigot joint.
3. A supporting structure for a helical electrode for facsimile recorders as claimed in claim 1, in which the radial parts are in the form of spaced radial arms.
4. A supporting structure for a helical electrode for facsimile recorders as claimed in claim 1, in which each section comprises one sixth of a revolution of the helix.
5. A supporting structure for a helical electrode for facsimile recorders as claimed in claim 1, in which the sections are die-cast.
References Cited in the file of this patent UNITED STATES PATENTS Kozak Oct. 28, 1941
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB19480/52A GB716079A (en) | 1952-08-01 | 1952-08-01 | Improvements in or relating to facsimile apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US2729818A true US2729818A (en) | 1956-01-10 |
Family
ID=10130063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US371488A Expired - Lifetime US2729818A (en) | 1952-08-01 | 1953-07-31 | Facsimile apparatus |
Country Status (3)
Country | Link |
---|---|
US (1) | US2729818A (en) |
FR (1) | FR1081629A (en) |
GB (1) | GB716079A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3095569A (en) * | 1958-07-24 | 1963-06-25 | Conval Corp | Recorder |
US3138428A (en) * | 1960-08-11 | 1964-06-23 | Litton Systems Inc | Helix and pressure bar recorder |
US3754283A (en) * | 1969-03-13 | 1973-08-21 | Alden Res Found | Recording drum with helical electrode |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2260811A (en) * | 1941-03-19 | 1941-10-28 | Screw Conveyor Corp | Coupling means for screw conveyers |
US2591640A (en) * | 1947-05-02 | 1952-04-01 | Jefferson Standard Broadcastin | Electrode arrangements for facsimile recorders |
-
1952
- 1952-08-01 GB GB19480/52A patent/GB716079A/en not_active Expired
-
1953
- 1953-07-27 FR FR1081629D patent/FR1081629A/en not_active Expired
- 1953-07-31 US US371488A patent/US2729818A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2260811A (en) * | 1941-03-19 | 1941-10-28 | Screw Conveyor Corp | Coupling means for screw conveyers |
US2591640A (en) * | 1947-05-02 | 1952-04-01 | Jefferson Standard Broadcastin | Electrode arrangements for facsimile recorders |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3095569A (en) * | 1958-07-24 | 1963-06-25 | Conval Corp | Recorder |
US3138428A (en) * | 1960-08-11 | 1964-06-23 | Litton Systems Inc | Helix and pressure bar recorder |
US3754283A (en) * | 1969-03-13 | 1973-08-21 | Alden Res Found | Recording drum with helical electrode |
Also Published As
Publication number | Publication date |
---|---|
GB716079A (en) | 1954-09-29 |
FR1081629A (en) | 1954-12-21 |
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