US3661455A - Electrophotographic copying machine - Google Patents

Electrophotographic copying machine Download PDF

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Publication number
US3661455A
US3661455A US119192A US3661455DA US3661455A US 3661455 A US3661455 A US 3661455A US 119192 A US119192 A US 119192A US 3661455D A US3661455D A US 3661455DA US 3661455 A US3661455 A US 3661455A
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US
United States
Prior art keywords
original
copying machine
electrophotographic copying
holder
photosensitive member
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
US119192A
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English (en)
Inventor
Ryoichi Namiki
Masao Ariga
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Canon Inc
Original Assignee
Canon Inc
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Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
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Publication of US3661455A publication Critical patent/US3661455A/en
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    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/28—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning
    • G03G15/30—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which projection is obtained by line scanning in which projection is formed on a drum

Definitions

  • the present invention relates to generally an electrophotographic copying machine and more particularly to a slit-exposure type electrophotographic copying machine capable of producing more than two copies from a single original in one cyclic copying operation. 7
  • an optical projection system is generally displaced in synchronism with the displacement of a photosensitive member between the latter and an original which is held in stationary position.
  • the light or radiationimage of the original which is illuminated by a suitable light source is projected upon the photosensitive member by the scanning of the original through the slit of the moving optical projection system.
  • the reciprocation of the optical projection or scanning system must be cycled for each copy.
  • One of the objects of the present invention is therefore to provide an electrophotographic copying machine capable of continuously making more than two copies in one cyclic operation at high speed.
  • Another object of the. present invention is to provide an electrophotographic copying machine in which a plurality of optical projection systems for exposure are held stationary so as to prevent the damages.
  • Another object of the present invention is to provide an electrophotographic copying machine in which any type of original in sheet or book may be placed upon an original holder whose upper surface is completely opened for this purose.
  • Another object of the present invention is to provide an electrophotographic copying machine especially adapted for use in the banks or the like where usually the predetermined number ofcopies ofa bill or the like must be made.
  • the present invention provides an electrophotographic copying machine in which a plurality of slits through which an original is scanned for exposure are disposed in spaced-apart relation with each other by a suitable distance along the path of an original holding and transport means which reciprocates and a plurality of optical projection systems are provided for projecting the light image of the original successively through the slits upon a photosensitive member which is displaced in synchronism with the original holding and transport means, whereby a plurality of copies may be made in one cyclic operation at a high speed.
  • an original 1 is displaced in the direction indicated by XX with respect to a photoelectrically sensitive drum 4 rotating in the opposite direction sov that the original 1 may be projected upon the drum 4 at 0 point through slits 2, and 2, by-optical projection systems comprising illumination light sources 5 and projection lenses 3, and 3,.
  • the original 1 is first projected through the slit 2 and then through the slit 2, while the original 1 is displaced in the direction indicated by the arrow in the conventional manner.
  • the original OR in sheet is inserted through an original inlet 7 of a casing 6 of the photocopying machine and a reproduced copy 9 is discharged into a receiving tray 10.
  • a photosensitive layer 12 consisting of a surface insulating layer, a photoconductive layer and a conducting or insulating layer in the order named is applied around the illustrating'the principle of periphery of a rotary drum '11 in the casing 6 and around the periphery of the rotary drum 11 are disposed a first charger 13, a simultaneous exposure-charging device 14,;a whole-surface illuminating device 15, a developing device 16, a third charger 1.7, an image transfer device 18 and a cleaning device 19 in the order named in the direction of rotation of the rotary drum 1].
  • the uniform positive or negative D.C. corona discharge is applied by the first charger 13 to the peripheral surface of the rotary drum 11.
  • the simultaneous exposure-charging means 14 the rotary drum 11 is applied with the AC. corona discharge or the DC. corona discharge with the polarity opposite to that given by the first charger l3 simultaneously when the light or radiation image of the original is projected upon the rotary drum 1], whereby the electrostatic latent image is formed.
  • the electrostatic latent image is uniformly illuminated so as to increase the action of the electrostatic latent image as the external field, thereby increasing the contrast of the latent image.
  • the electrostatic latent image is developed into a positive image with the toner which is charged with the polarity opposite to that of the latent image.
  • the electrostatic latent image may be developed into a negative image with the toner which is electrostatically charged with the same polarity with that of the latent image. It is preferable to employ a fur-brush or magnet brush developing method.
  • the third charger 17 which is not necessarily required, serves to applythe electrostatic charge with a suitable polarity to the toner image upon the rotary drum 11 so that the transfer of the toner image to a copying paper may be facilitated.
  • the toner image is electrostatically transferred to the copying paper by the image transfer device 18 and the toner remained on the rotary drum 11 is cleaned by a cleaning roller 20 in the cleaning device 19.
  • the original transport device comprises an original holder 25 which rides on rails 21, a pair of conveyors which are disposed on both sides of and below the original holder 25 and each of which consists a conveyor belt 22 and drive rollers 23 and 24 for transporting the original OR inserted through the inlet 7, a wire 26 for transporting the original holder 25, a pulley '27, a capstan 28, photoelectric effect elements 29, 30 and 31 and light sources 32, 33 and 34.
  • the original holder 25 has two types of guides so that two different size originals may be selectively placed upon the original holder 25.
  • the original OR (for example a bill or the like) is inserted throughthe inlet 7 with the image faced up, onto the original holder 25 so that the light from the light source 32 to the photoconductive element 29 is interrupted. Therefore a switching circuit S1 in a control circuit shown in FIG. is actuated to energize an output relay K3 to close its contact K3, thereby energizing relays A and B. As a consequence a motor M6 is energized for driving the conveyor belt 22 to thereby automatically transport the original OR on the original holder 25 to a position 25,.
  • a switching circuit S1 in a control circuit shown in FIG. is actuated to energize an output relay K3 to close its contact K3, thereby energizing relays A and B.
  • a motor M6 is energized for driving the conveyor belt 22 to thereby automatically transport the original OR on the original holder 25 to a position 25,.
  • the motor M6 rotates in the direction for transporting the original so that the leading edge of the original OR may be positioned at a right angle relative to the direction of feed of the original.
  • the drum clutch for transporting the original holder 25 is not actuated so that it remains in the initial position.
  • a microswitch (fixed to the rotary drum and not shown) is actuated to thereby reverse the capstan 28 to return the original holder 25 to its original or initial position.
  • the light from the light sources 33 and 34 to the photoconductive elements 30 and 31 is interrupted so that the output relays K3 and K4 are energized to thereby energize the relays A and C.
  • the auxiliary coil L of the motor M6 is energized in the reversed direction relative to the main coil L, so that the motor M6 is reversed in direction.
  • the conveyor belt 22 is also reversed in direction so that the original OR is discharged through the inlet 7.
  • the relay A When the operator pulls out the original, the relay A is deenergized to thereby stop the motor M6.
  • the position of the photoconductive element 29 relative to the conveyor belt 22 is so determined that unless the operator pulls out the original OR the relay A will not be deenergized. As a consequence, even when the operator inserts the next original into the photocopying machine, the motor M6 will not drive so as to place the next original onto the original holder 25.
  • a copy-number-setting dial may be set to the desired number of copies to be reproduced from the same original.
  • the original holder 25 returns to its original or initial position, the light from the light sources 33 and 34 to the photoconductive elements 30 and 31 is interrupted so that the original OR is slightly moved toward the left in FIG. 3 by the conveyor belt 22 to permit the light to enter again the photoconductive elements 30 and 31.
  • the conveyor belt 22 is reversed in direction to move or place back the original onto the original holder 25, so that the interception of the light by the elements 30 and 31 is again interrupted and the original holder 25 is transported for exposure in the manner described above. This original transporting or reciprocating operation is cycled until the desired number of copies is reproduced.
  • One of the novel features of the present invention resides in the fact that two different originals may be reproduced on a single copying paper at the same time. For example when it is desired to reproduce the copies of a number of bills for one customer or the like, a card or the like hearing the customers name, address, deposit number, and the like may be placed in a position indicated by 25, upon the original holder 25 while the bills or the like placed in position at 25 may be successively reproduced in the manner described above so that the copies each bearing the same card and the different bill or the like may be obtained.
  • the optical projection system is accommodated within a dust-proof chamber 36 having an upper partition wall 35 which serves to completely separate the optical system from the various devices disposed above, especially from the developing device and the like so that optical elements such as lenses 37 and 38, reflecting mirrors 39, 40 and 41 may be prevented from being contaminated by the toner or the like.
  • the optical system is arranged to facilitate the assembly, adjustment, inspection and maintenance.
  • two slit exposure devices 42 and 43 are provided so that the original may be exposed or projected twice in one going stroke.
  • the light or radiation image of the original may be projected upon the rotary drum 11 through the first slit exposure device 42, the lens 37 and the reflecting mirrors 39 and 41 along the optical path P1.
  • the light or radiation image of the original may be projected upon the rotary drum through the second slit-exposure device 43, the lens 38, and reflecting mirrors 40-and 41 along the optical path P
  • the light or radiation image is projected through the simultaneous exposure-charging device 14.
  • the light or radiation image from the slit exposure device 42 is projected, the light entering into the lens 38 is interrupted by a shutter 44 whereas the light or radiation image is projected through the exposure device 43, the optical path P, is interrupted by a shutter 44' in front of the lens 37.
  • the actuation of these shutters 44 and 44 is controlled by an electromagnet clutch which is energized in response to the actuation of a microswitch which in turn is actuated by the rotary drum.
  • the present invention provides a high-speed photocopying machine since more than two exposures or projections of light or radiation images of the original may be made during one reciprocation cycle of the original holder. Therefore, the electrophotographic copying machine of the present invention is particu larly adapted to make only a few copies from a single original as in the case of copying a bill or the like. In addition, the present invention may eliminate the troublesome operation of placing the original in correct position because the original may be automatically placed in desired position on the original holder.
  • An electrophoto claim 1 wherein said original illumination means are light sources disposed for each of said plurality of fixed slits.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
US119192A 1970-03-02 1971-02-26 Electrophotographic copying machine Expired - Lifetime US3661455A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1954870 1970-03-02

Publications (1)

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US3661455A true US3661455A (en) 1972-05-09

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US119192A Expired - Lifetime US3661455A (en) 1970-03-02 1971-02-26 Electrophotographic copying machine

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US (1) US3661455A (enrdf_load_stackoverflow)
DE (1) DE2109674B2 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033688A (en) * 1975-02-14 1977-07-05 Agfa-Gevaert, Aktiengesellschaft Color copying apparatus
US4129379A (en) * 1976-11-17 1978-12-12 Ogrisek Harriet H Optical system for electrostatic copiers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US26771A (en) * 1860-01-10 Improvement in the moles of drain-plows
US3181418A (en) * 1961-07-25 1965-05-04 Rca Corp Projection apparatus
US3419327A (en) * 1965-07-09 1968-12-31 Hitachi Ltd Xerographic reproducing apparatus
US3528738A (en) * 1967-12-07 1970-09-15 Eastman Kodak Co Method and apparatus for scan lighting in photocopy projection equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US26771A (en) * 1860-01-10 Improvement in the moles of drain-plows
US3181418A (en) * 1961-07-25 1965-05-04 Rca Corp Projection apparatus
US3419327A (en) * 1965-07-09 1968-12-31 Hitachi Ltd Xerographic reproducing apparatus
US3528738A (en) * 1967-12-07 1970-09-15 Eastman Kodak Co Method and apparatus for scan lighting in photocopy projection equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033688A (en) * 1975-02-14 1977-07-05 Agfa-Gevaert, Aktiengesellschaft Color copying apparatus
US4129379A (en) * 1976-11-17 1978-12-12 Ogrisek Harriet H Optical system for electrostatic copiers

Also Published As

Publication number Publication date
DE2109674B2 (de) 1973-08-09
DE2109674C3 (enrdf_load_stackoverflow) 1974-03-14
DE2109674A1 (de) 1971-09-16

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