US2770517A - Facsimile scanning mechanism - Google Patents

Facsimile scanning mechanism Download PDF

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Publication number
US2770517A
US2770517A US417057A US41705754A US2770517A US 2770517 A US2770517 A US 2770517A US 417057 A US417057 A US 417057A US 41705754 A US41705754 A US 41705754A US 2770517 A US2770517 A US 2770517A
Authority
US
United States
Prior art keywords
belt
stylus
pulleys
holders
styluses
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
Application number
US417057A
Other languages
English (en)
Inventor
Douglas M Zabriskie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Union Telegraph Co
Original Assignee
Western Union Telegraph Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE556584D priority Critical patent/BE556584A/xx
Priority to BE536593D priority patent/BE536593A/xx
Application filed by Western Union Telegraph Co filed Critical Western Union Telegraph Co
Priority to US417057A priority patent/US2770517A/en
Priority to GB7230/55A priority patent/GB765960A/en
Priority to FR1131099D priority patent/FR1131099A/fr
Priority claimed from US577562A external-priority patent/US2853358A/en
Application granted granted Critical
Publication of US2770517A publication Critical patent/US2770517A/en
Priority to FR71462D priority patent/FR71462E/fr
Priority to DEI13082A priority patent/DE1112100B/de
Priority to CH353765D priority patent/CH353765A/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04N1/14—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 endless belt carrying the scanning heads or at least a part of the main scanning components

Definitions

  • This invention relates to an improvement in the construction of facsimile recorders, and more particularly to a novel structure for providing traverse of the recording medium by a stylus which is carried on a belt made of elastic material.
  • Previously constructed belt type facsimile recorders such as that of my application Ser. No. 279,261, filed March 29, 1952, have employed a belt made of flat spring steel and rotated between two pulleys for supporting and carrying a plurality of writing styluses across the surface of an electrographic recording paper.
  • the belt in such machines is constructed of a flat spring steel strip bent into a closed curve and welded together at the ends. It is necessary to punch holes at regular intervals throughout the length of the belt for engagement with corresponding cogs formed on the surfaces of the driving and idler pulleys over which the belt is looped.
  • a further object of this invention is to provide a means for retaining accurate stylus registration in a belt type scanner for facsimile machines While employing a belt constructed principally of long-life rubber-like materials.
  • Still another object of the present invention is to effect a simplification in the construction of facsimile scannerbelt pulleys.
  • Fig. 1 is a plan view of a stylus traversing belt and pulley system constructed in accordance with the present invention
  • Fig. 2 is an elevation view of the mechanism of Fig. 1;
  • Fig. 3 is a sectional view of Fig. 1;
  • Fig. 4 is a sectional view of a different embodiment of Fig. 3;
  • Fig. 5 is an enlarged plan of a portion of Fig. 1;
  • Fig. 6 depicts an alternative mode of attachment of a stylus assembly to a flexible belt.
  • a belt 1 is stretched between a driving pulley 2 and an idler pulley 3 such that the stylus holders 4 are drawn across the electrographic recording paper 5 in approximately linear fashion when the driving pulley 2 is rota-ted by a motor and gear reducing mechanism which is not shown on the drawing.
  • Notches 24 in the pulleys accommodate the stylus holders in their passage around the pulleys.
  • a guiding means be introduced against which the stylus holder may slide while in motion across the recording sheet.
  • a system of stylus guidance well suited for the instant application consists of a long trough-shaped magnetic assembly having a U-shaped cross-section, mounted below the stylus guide for attracting it into sliding contact therewith.
  • Such an arrangement is shown in my co-pending application Ser. No. 357,731, filed May 27, 1953, the parts whereof are here represented by the magnetic guide rails 6 and 7.
  • the sliding action of the stylus holders along the magnetic guide rails further requires that a suitably wear-resistant material be used in the construction of the stylus holder, and it has been found that the wear plates 8 which are secured to the inner member 9 of the stylus holders 4 by the screws 25 can be made of tempered spring steel.
  • the Wear plates 8 are therefore replaceable as required for the instant invention since the belt outlasts the Wear plate, a condition formerly not encountered.
  • the stylus holders 4 as seen in Figs. 2 and 5, comprise a recessed upper plate of steel having a guideway 12 cut in its top surface to receive a stylus wire of tungsten metal 13, a screw-fastened tab 14 overlying the guideway.
  • Four holddown screws 11 engage an inner plate 9 to clamp the belt between the plates, and an adjusting screw 15 operates to spring the wear plate 8 downward for stylus height adjustment.
  • Screw 15 is preferably soldered in place after being adjusted to produce the correct stylus height when the belt assembly is in use. it will be observed that the entire assembly with the exception of the stylus itself is constructed of magnetic material so that it is readily attracted by the aforementioned magnetic rails 6 and '7 into guiding contact therewith.
  • a belt constructed of a flexible conductive material such as conductive rubber, in which case the bar 16 is not required for guiding purposes, and elec trical connection to the styluses can be made by other appropriate means, such as by brushes contacting a conductive belt pulley.
  • the construction shown .in Fig. 6 is employed.
  • the stylus holder 22 instead of being bolted to the belt 1, is secured to it by means of cement 17.
  • a suitable wear plate 23 is cemented to the inner side of the belt beneath each such stylus holder for the purposes and in the location previously described. In employing this method of assembly, in order to obtain a cemented joint of high tensile strength, it is desirable to use a heat vulcanizable type of cement, and to plate or otherwise coat with brass the metal parts to which the cement is intended to adhere.
  • Fig. 3 shows a cross-section of the belt 1 in which may be seen the metallic pull cords 18 located approximately at the neutral axis of the belt and embedded in and bonded to the elastomeric material comprising the body of the belt, and the pulley 3 over which the belt turns.
  • the features of the construction of this pulley which apply also to the pulley 2, and which render it especially advantageous and one of the important advantages made possible by this invention are seen more clearly in the cross-sectional view of a different embodiment thereof shown in Fig. 4. Because of the large size and outwardly convex contour of the recesses 19 in the pulley Zil, unit stress in the material is relatively low and the shape is moldable.
  • the yielding nature of the material of the belt 1 renders it non-cutting and non-abrasive to the pulley.
  • a suitable metal bearing bushing 21 is cast in place at the time the pulley is molded.
  • An advantage of the particular construction of stylus carrying belt here described is the longitudinal stability of its parts, since by the use of a steel wire core in the neutral axis of the belt, longitudinal creep or anomalous displacement of the stylus holders, which is evidenced by loss of detail in the facsimile reproduction, is avoided to the extent that results are obtained which are in all respects equivalent in quality to those obtained with a steel belt.
  • a further and principal advantage obtained by the use of this invention is the extension of the life of the stylus carrying belt by a factor of at least 30 under conditions of intensive use requiring frequent starting and stopping. Such a gain would constitute an important advantage even if accompanied by some degradation of the fascimile reproduction, and it is therefore obvious that preservation of full detail under this condition, as previously described constitutes an independent and additional advantage of the invention.
  • a facsimile recorder of the kind employing electric Writing on a sheet of electrosensitive paper in combination, a belt of flexible organicfnateral, metallic tension strands embedded longitudinally in the interior thereof, cogs formed on the inner surface thereof, a pair of elt carrying pulleys constructed of readily moldable material and having recesses in the faces thereof, metallic hubs in the said pulleys, a plurality of stylus carrying stylus holders afiixed to the said belt, Styluses in the said holders, means for guiding the said stylus holders in a linear track, a conductive bar fixed adjacent the path of travel of said stylus holders in sliding contact therewith, and a sheet of electrographic paper advanceably retained in the path of travel of said styluses.
  • a belt of flexible elastomc'ric material in combination, a belt of flexible elastomc'ric material, metallic tension strands embedded longitudinally in the interior thereof, cogs formed on the inner surface thereof, a pair of belt carrying pulleys constructed :of insulating material and having recesses in the faces thereof, metallic hubs in the said pulleys, a plurality of stylus carrying stylus holders affixed to the said belt, styluscs in the said holders, means for guiding the said stylus holders in a linear track in the plane of the pulleys, an electrically conductive bar fixed adjacent the path of travel of said stylus holders in sliding contact therewith, and a sheet of electrographic paper advanceable in its own plane, retained in the path of travel of said styluses.
  • a facsimile recorder of the kind employing electric writing on a sheet of electroscnsitive paper in combination, an endless belt of flexible rubber, steel tension strands embedded longitudinally in the interior thereof, cogs formed on the inner surface of said belt, a pair of belt carrying pulleys on fixed centers constructed of plastic insulating material and having cog receiving and stylus holder receiving recesses in the faces thereof, metallic hubs in the said pulleys, a plurality of vertically adjusta le stylus carrying stylus holders ailixed to the said belt, styluses in the said holders, means for guiding the said stylus holders in a linear track in the plane of the pulleys, a conductive-bar having a flat face, fixed adjacent the path of travel of said stylus holders for guiding and sliding contact thereon, and a sheet of electrographic paper advanceable in its own plane, resiliently retained in the path of travel of said styluses.
  • a facsimile recorder of the kind employing electric writing on a continuous sheet of electrosensitivc paper in combination, a belt of flexible and elastic polymeric material, longitudinal inextensible strands embedded in the interior thereof, cogs formed on the inner surface thereof, a plurality of pulleys having cog receiving recesses in the faces thereof, rotatable about fixed axes, engaging and driving the said belt in a predetermined path having a portion linear in at least one projection thereof, means for driving at least one of the said pulleys, a plurality of stylus carrying stylus holders affixed to the said belt, styluses in the said holders, electrically conductive means to energize the said styluses, and a sheet of electrographic paper advanceably retained in the path of travel of the writing ends of the said styluses.
  • a facsimile recorder of the kind employing electric writing :on a continuous sheet of electrosensitive paper in combination, a belt of flexible and elastic polymeric material, longitudinal inextensible strands embedded in the interior thereof, cogs formed on the inner surface thereof, a plurality of molded plastic pulleys having cog receiving recesses in the faces thereof, rotatable about fixed axes, engaging and driving the said belt in a predetermined path having a portion linear in at least one projection thereof, means for driving at least one of the said pulleys, a plurality of stylus carrying stylus holders affixed to the said belt, styluses in the said holders, an electrically conductive trolley fixed adjacent to the path of stylus travel for sliding contact therewith to energize the said styluses, and a sheet lOf electrographic paper advanceably retained in the path of travel of said styluses.
  • Facsimile scanning means comprising a flexible belt of elastic material, a filamentary reinforcement of inelastic strands therein, -a plurality of driving teeth molded in spaced sequence on the interior surface thereof, at least one stylus holder means immova'bly afiixed thereto,
  • writing stylus means afiixed to the said stylus holder means, a plurality of belt carrying pulleys including a belt driving pulley, having belt driving tooth receiving recesses in the perimeter thereof, the said belt carrying pulleys being rotatable on axes fixed during operation and defining a path of stylus travel having a linear portion therein, electrically conductive stylus energizing means, and a sheet of electrographic paper advanceably retained in the path of travel of said styluses.
  • Facsimile scanning means comprising a flexible belt of neoprene, multiple filamentary reinforcement of steel strands therein, a plurality of driving teeth molded in spaced sequence on the interior surface thereof, at least one stylus holder means immovably aflixed thereto, writing stylus means aifixed to the said stylus holder means, a plurality of belt carrying pulleys including a belt driving pulley of moldable organic material having belt driving, tooth receiving recesses in the perimeter thereof, the said belt carrying pulleys being rotatable on fixed axes and defining .a path of stylus travel having a linear portion therein, a sheet of electrographic paper retained for advancement in contact with the said styluses, electrically conductive stylus energizing means, comprising a fixed member having a straight portion for sliding contact on the said stylus holder means whereby the styluses are pressed into paper contact and -'a straight edged guideway disposed parallel to the path of stylus travel for stylus

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Facsimiles In General (AREA)
US417057A 1954-03-18 1954-03-18 Facsimile scanning mechanism Expired - Lifetime US2770517A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
BE556584D BE556584A (xx) 1954-03-18
BE536593D BE536593A (xx) 1954-03-18
US417057A US2770517A (en) 1954-03-18 1954-03-18 Facsimile scanning mechanism
GB7230/55A GB765960A (en) 1954-03-18 1955-03-11 Facsimile scanning mechanism
FR1131099D FR1131099A (fr) 1954-03-18 1955-03-16 Mécanismes d'exploration pour appareil de transmission fac-similé
FR71462D FR71462E (fr) 1954-03-18 1957-04-08 Mécanismes d'exploration pour appareil de transmission fac-similé
DEI13082A DE1112100B (de) 1954-03-18 1957-04-10 Schreibsystem fuer Faksimilegeraete
CH353765D CH353765A (de) 1954-03-18 1957-04-10 Faksimileschreiber

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US417057A US2770517A (en) 1954-03-18 1954-03-18 Facsimile scanning mechanism
US577562A US2853358A (en) 1956-04-11 1956-04-11 Facsimile stylus belt and stylus holder

Publications (1)

Publication Number Publication Date
US2770517A true US2770517A (en) 1956-11-13

Family

ID=27023582

Family Applications (1)

Application Number Title Priority Date Filing Date
US417057A Expired - Lifetime US2770517A (en) 1954-03-18 1954-03-18 Facsimile scanning mechanism

Country Status (6)

Country Link
US (1) US2770517A (xx)
BE (2) BE556584A (xx)
CH (1) CH353765A (xx)
DE (1) DE1112100B (xx)
FR (1) FR71462E (xx)
GB (1) GB765960A (xx)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934967A (en) * 1957-11-22 1960-05-03 Us Rubber Co Belt and gear drive
US2978288A (en) * 1959-10-08 1961-04-04 Western Union Telegraph Co Facsimile scanner
US3084014A (en) * 1960-05-31 1963-04-02 Beckman Instruments Inc Pen drive for recorders and the like
US3188645A (en) * 1965-06-08 Stethoscopic spectrograph
US3266047A (en) * 1961-06-15 1966-08-09 Western Union Telegraph Co Belt drive assembly for facsimile recorder
US3300017A (en) * 1965-04-30 1967-01-24 Sperry Rand Corp Electrosensitive printing apparatus with print head continuously moved across paper
US3348230A (en) * 1964-01-13 1967-10-17 Ross Lab Inc Recording indicators for pulse-echo type detection systems
US3581001A (en) * 1967-02-02 1971-05-25 Stewart Warner Corp Facsimile scanner assembly
US3683412A (en) * 1969-10-03 1972-08-08 Electronic Transmission System Stylus and mounting for electric discharge facsimile recorder
US3855600A (en) * 1972-01-28 1974-12-17 Philips Corp Printing device with stabilized printing electrode
US3973264A (en) * 1972-12-07 1976-08-03 Graphic Sciences, Inc. Stylus assembly for facsimile receiver
US4553951A (en) * 1983-06-02 1985-11-19 The Gerber Scientific Instrument Company Non-slip pulley and belt drive
US5329303A (en) * 1991-12-05 1994-07-12 Transit Services, Inc. Compact chart recorder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4060815A (en) * 1976-12-29 1977-11-29 Alden Research Foundation Electrical recorder and belt with styli therefor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2129483A (en) * 1936-01-09 1938-09-06 Harry R Van Deventer Apparatus for use in facsimile transmitting systems
US2133181A (en) * 1935-06-18 1938-10-11 Jr Edward W Allen High speed facsimile recording device
US2355369A (en) * 1938-11-16 1944-08-08 Finch Telecommunications Inc Multistylus facsimile recorder
US2643173A (en) * 1949-07-16 1953-06-23 Times Facsimile Corp Stylus drive for facsimile recorders

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2263332A (en) * 1937-09-24 1941-11-18 William G H Finch High speed portable facsimile system
US2290230A (en) * 1940-08-16 1942-07-21 William G H Finch Stylus mounting
US2766097A (en) * 1953-05-27 1956-10-09 Western Union Telegraph Co Magnetic stylus guide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2133181A (en) * 1935-06-18 1938-10-11 Jr Edward W Allen High speed facsimile recording device
US2129483A (en) * 1936-01-09 1938-09-06 Harry R Van Deventer Apparatus for use in facsimile transmitting systems
US2355369A (en) * 1938-11-16 1944-08-08 Finch Telecommunications Inc Multistylus facsimile recorder
US2643173A (en) * 1949-07-16 1953-06-23 Times Facsimile Corp Stylus drive for facsimile recorders

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188645A (en) * 1965-06-08 Stethoscopic spectrograph
US2934967A (en) * 1957-11-22 1960-05-03 Us Rubber Co Belt and gear drive
US2978288A (en) * 1959-10-08 1961-04-04 Western Union Telegraph Co Facsimile scanner
US3084014A (en) * 1960-05-31 1963-04-02 Beckman Instruments Inc Pen drive for recorders and the like
US3266047A (en) * 1961-06-15 1966-08-09 Western Union Telegraph Co Belt drive assembly for facsimile recorder
US3348230A (en) * 1964-01-13 1967-10-17 Ross Lab Inc Recording indicators for pulse-echo type detection systems
US3300017A (en) * 1965-04-30 1967-01-24 Sperry Rand Corp Electrosensitive printing apparatus with print head continuously moved across paper
US3581001A (en) * 1967-02-02 1971-05-25 Stewart Warner Corp Facsimile scanner assembly
US3683412A (en) * 1969-10-03 1972-08-08 Electronic Transmission System Stylus and mounting for electric discharge facsimile recorder
US3855600A (en) * 1972-01-28 1974-12-17 Philips Corp Printing device with stabilized printing electrode
US3973264A (en) * 1972-12-07 1976-08-03 Graphic Sciences, Inc. Stylus assembly for facsimile receiver
US4553951A (en) * 1983-06-02 1985-11-19 The Gerber Scientific Instrument Company Non-slip pulley and belt drive
US5329303A (en) * 1991-12-05 1994-07-12 Transit Services, Inc. Compact chart recorder

Also Published As

Publication number Publication date
FR71462E (fr) 1960-01-05
GB765960A (en) 1957-01-16
BE556584A (xx)
DE1112100B (de) 1961-08-03
CH353765A (de) 1961-04-30
BE536593A (xx)

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