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US3584733A - Transport system for single sheets of photosensitive material - Google Patents

Transport system for single sheets of photosensitive material Download PDF

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Publication number
US3584733A
US3584733A US759948A US3584733DA US3584733A US 3584733 A US3584733 A US 3584733A US 759948 A US759948 A US 759948A US 3584733D A US3584733D A US 3584733DA US 3584733 A US3584733 A US 3584733A
Authority
US
United States
Prior art keywords
electrode
belt
voltage
voltage source
conveyor belt
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
US759948A
Other languages
English (en)
Inventor
Heinrich Isermann
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.)
Meteor Siegen Apparatebau Paul Schmeck GmbH
Original Assignee
Meteor Siegen Apparatebau Paul Schmeck GmbH
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
Application filed by Meteor Siegen Apparatebau Paul Schmeck GmbH filed Critical Meteor Siegen Apparatebau Paul Schmeck GmbH
Application granted granted Critical
Publication of US3584733A publication Critical patent/US3584733A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/52—Details
    • G03B27/58—Baseboards, masking frames, or other holders for the sensitive material
    • G03B27/585—Handling cut photosensitive sheets
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0266—Arrangements for controlling the amount of charge

Definitions

  • the invention relates to a system for transporting single sheets of photosensitive material in a given plane, more particularly xerographic or photographic copying material into and out of the exposure position in the focal plane of the copying machine.
  • an endless conveyor belt is tensioned between drive and reversal rollers and consists of electrostatically chargeable material.
  • the operative run of said belt is moved in a given plane, and an electrostatic charge is transmitted to the conveyor belt by a stationary electrode mounted close to the oncoming operative run of the conveyor belt.
  • the electrostatic charge causes the transported sheet to be attracted to said belt.
  • the known system is satisfactory under normal working conditions, i.e. with average relative air humidity.
  • the DC voltage source in case of low relative air humidity and consequent tie resistance of the electric path running from the electrode to the closest point of earth potential, the DC voltage source is unable to transmit a sufficient electrostatic charge to the operative run of the conveyor belt, so that the paper sheet is unsufficiently attracted.
  • the voltage of the DC voltage source cannot be made higher, as then in case of higher humidity sparkovers (breakdowns) would occur between the electrode and the earth potential.
  • a load resistor of predetermined resistance is connected between the DC voltage source and the electrode, which resistor controls, with the DC voltage remaining constant, the voltage applied to the electrode in dependence upon the current flow through the electrode, said flow being determined by the value of the transfer resistance between the electrode and the closest point of earth potential.
  • the electrostatic voltage is automatically controlled to a higher value by the load resistor because of the decrease of voltage across the load resistor on account of the lower rate of current flow, which rate is in turn dependent upon the transfer resistance at the electrode.
  • an earthed roller is provided at the side of the operative run of the conveyor belt opposite to the electrode.
  • the upper operative run of the conveyor belt 5, consisting for example of tetrafluoroethylene (trade mark Teflon”) runs over a reversing roller 1 and a drive roller 2 (the drive being not shown).
  • Teflon tetrafluoroethylene
  • the upper surface of the operative run of belt 5 moves in a definite plane, in which the transported paper sheet is exposed by means which are also not shown.
  • a stationary electrode 4 is disposed, which electrode is connected to a plate 7 that extends transversely to the direction of movement of the belt and also acts as a guiding; means for the operative run of said belt.
  • the electrode 4 is connected, via line 10, to a load resistor 9, which in turn is connected to the positive terminal of the charging unit 8 constituting the DC voltage source.
  • the negative terminal of the charging unit 8 is earthed via lines 12 and 13.
  • an earthed roller 3 On the other side of the operative run of the conveyor belt 5, opposite to the electrode 4, an earthed roller 3 is mounted which provides earthed potential relatively close to the electrode 4, and which simultaneously urges a to be transported paper sheet 15 on to the operative :run of belt 5.
  • the earthed roller 3 is provided with a guiding bar 6 for guiding the paper sheet 15 and is earthed via line 114.
  • a system for transporting single sheets of photosensitive material in a given plane, more particularly xerographic or photographic copy material into and out of the exposure position in the focal plane of a copy machine comprising; an electrostatically chargeable endless conveyor belt which is tensioned between drive and reversal rollers, an outer surface of said conveyor belt being movable in said given plane; a voltage source for producing a continuous direct current voltage without polarity reversal; an electrode electrically connected to said voltage source, extending transversely of the direction of movement of said belt and positioned in the region of said given plane for producing an electrostatic voltage sufficient to electrostatically charge said belt for attracting said sheets to said belt; means providing ground potential on the opposite side of said belt in opposition to said electrode, and a fixed resistor electrically connected intermediate said electrode and said voltage source for varying the current through said electrode in accordance with the relative humidity at said electrode whereupon said electrostatic voltage is varied in accordance with said relative humidity and said electrostatic charge on said belt is continuously maintained at a suff cient level
  • ground potential means comprises a roller having a grounded electrode connected thereto is provided adjacent said conveyor belt on a side opposite to the electrode.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Paper Feeding For Electrophotography (AREA)
US759948A 1967-09-15 1968-09-16 Transport system for single sheets of photosensitive material Expired - Lifetime US3584733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1597708 1967-09-15

Publications (1)

Publication Number Publication Date
US3584733A true US3584733A (en) 1971-06-15

Family

ID=5680642

Family Applications (1)

Application Number Title Priority Date Filing Date
US759948A Expired - Lifetime US3584733A (en) 1967-09-15 1968-09-16 Transport system for single sheets of photosensitive material

Country Status (3)

Country Link
US (1) US3584733A (fr)
FR (1) FR1586210A (fr)
GB (1) GB1187537A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244465A (en) * 1978-04-21 1981-01-13 Taihei Chemicals Limited Electrostatic holding and conveying apparatus
US4253896A (en) * 1979-05-10 1981-03-03 Armstrong Cork Company Method of maintaining key between silicone belt and vinyl resin blanket by applying a corona discharge to the belt
US5019871A (en) * 1988-12-09 1991-05-28 Canon Kabushiki Kaisha Apparatus for electrostatically absorbing an image supporting material on an image supporting carrying member based on the kind of material used
US5276483A (en) * 1988-11-08 1994-01-04 Canon Kabushiki Kaisha Image forming apparatus provided with an attraction charger controlled by one or more ambient conditions
US5286542A (en) * 1992-06-16 1994-02-15 Advanced Belt Technology Welded non-woven endless belt
US6595515B2 (en) * 2000-08-11 2003-07-22 Canon Kabushiki Kaisha Sheet conveying device with increased electric voltage
US20100230890A1 (en) * 2009-03-10 2010-09-16 Brother Kogyo Kabushiki Kaisha Recording apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA675233A (en) * 1963-12-03 Vaccaro Angelo Apparatus for feeding and coating a web
US3309960A (en) * 1964-04-21 1967-03-21 Delplanque Marcel Lo Alexandre Photographic reproducing apparatus
US3325709A (en) * 1963-09-16 1967-06-13 Grace W R & Co Device for electrostatically transporting an unrestrained sheet of dielectric film material
US3462909A (en) * 1967-03-03 1969-08-26 Weldotron Corp Packaging method and apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA675233A (en) * 1963-12-03 Vaccaro Angelo Apparatus for feeding and coating a web
US3325709A (en) * 1963-09-16 1967-06-13 Grace W R & Co Device for electrostatically transporting an unrestrained sheet of dielectric film material
US3309960A (en) * 1964-04-21 1967-03-21 Delplanque Marcel Lo Alexandre Photographic reproducing apparatus
US3462909A (en) * 1967-03-03 1969-08-26 Weldotron Corp Packaging method and apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244465A (en) * 1978-04-21 1981-01-13 Taihei Chemicals Limited Electrostatic holding and conveying apparatus
US4253896A (en) * 1979-05-10 1981-03-03 Armstrong Cork Company Method of maintaining key between silicone belt and vinyl resin blanket by applying a corona discharge to the belt
US5276483A (en) * 1988-11-08 1994-01-04 Canon Kabushiki Kaisha Image forming apparatus provided with an attraction charger controlled by one or more ambient conditions
US5019871A (en) * 1988-12-09 1991-05-28 Canon Kabushiki Kaisha Apparatus for electrostatically absorbing an image supporting material on an image supporting carrying member based on the kind of material used
US5286542A (en) * 1992-06-16 1994-02-15 Advanced Belt Technology Welded non-woven endless belt
US6595515B2 (en) * 2000-08-11 2003-07-22 Canon Kabushiki Kaisha Sheet conveying device with increased electric voltage
US20100230890A1 (en) * 2009-03-10 2010-09-16 Brother Kogyo Kabushiki Kaisha Recording apparatus
US8205882B2 (en) * 2009-03-10 2012-06-26 Brother Kogyo Kabushiki Kaisha Recording apparatus

Also Published As

Publication number Publication date
FR1586210A (fr) 1970-02-13
GB1187537A (en) 1970-04-08

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