US3635554A - Exposure system - Google Patents

Exposure system Download PDF

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Publication number
US3635554A
US3635554A US861511A US3635554DA US3635554A US 3635554 A US3635554 A US 3635554A US 861511 A US861511 A US 861511A US 3635554D A US3635554D A US 3635554DA US 3635554 A US3635554 A US 3635554A
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US
United States
Prior art keywords
carriage
exposure
along
movement
support
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
US861511A
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English (en)
Inventor
Howard T Hodges
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak 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
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3635554A publication Critical patent/US3635554A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
    • G03G15/04081—Exposure from behind the photoconductive surface

Definitions

  • ABSTRACT An exposure system is provided wherein a rotatable drum, having a support for an electrophotographic material, is rotatable past a series of processing stations and is connected by means of an endless belt to a carriage, which carriage is reciprocated back and forth across an exposure slit. This is accomplished by means, such as lugs or a clamp, which interlock the belt with the carriage in response to a predetermined position of the electrophotographic material to move the carriage across the exposure slit and thereafter disengage the carriage from the belt so that the carriage may be returned to its initial position by a return means for the next cycle.
  • This invention relates to an electrophotographic device and more particularly to a device wherein a carriage supporting an original document is reciprocated past an exposure slit in response to movement of a photoconductive surface past an exposure station, which station is one of a series of electrophotographic stations.
  • This image may then be transferred to a suitable receiver sheet and the photoconductor may be cleaned, if desired, at another station for reuse.
  • Synchronism between the movement of the photoconductive material and the original document may be accomplished by means interconnecting a movable carriage for supporting the original document and the photoconductive support.
  • This interconnection may take the form of belts which are endless, as disclosed in US. Pat. No. 2,959,095 to Magnusson, or may consist of belts which are wound up on pulleys, as in US. Pat. No. 3,062,094 to Mlayo.
  • the carriage is permanently attached to the belt and the belt is engaged or disengaged with a mechanism connected to the electrophotographic drum causing the belt and hence the carriage to move in synchronism therewith.
  • a substantial load is placed on the drive mechanism whenever the belt is engaged because it is necessary to accelerate the mass of the entire drive system and the carriage.
  • Such an arrangement can result in slippage at the beginning of the cycle so that in practice the carriage does not necessarily move in synchronism with the drum as desired. This can result in a misalignment or distortion of the resulting electrophotographic image.
  • a rotatably mounted electrophotographic drum or support is provided with a surface for supporting a photoconductor which is moved respectively through a charging station.
  • a carriage is movably supported for movement past an exposure slit so that an image may be projected by a lens system to the exposure station.
  • An endless belt interconnects the electrophotographic support with the carriage so that the carriage moves past the slit at the same speed as the photoconductive material moves past the exposure station so that an electrostatic image may be formed thereon.
  • the endless belt moves continuously with the drum but the carriage moves with the belt only during the exposure portion of the cycle.
  • an electromagnetic means such as a solenoid
  • a solenoid for temporarily attaching the carriage to the belt.
  • the photoconductor closes a switch in circuit with the solenoid causing the latter to grip the belt so that the carriage is moved therewith.
  • the switch is opened so that the solenoid releases the belt and the carriage is returned to its initial position, as by a weight.
  • one ormore lugs are provided on the endless belt which engage the carriage at the beginning of the cycle to move it across the exposure slit and then become disengaged therefrom so that the carriage may be returned to its initial position.
  • FIG. I is a diagrammatic side elevation, with certain parts in section for clarity of illustration, showing a preferred form of the invention wherein a solenoid is energized to grip an endless timing belt to move a carriage across an exposure slit;
  • FIG. 2 is a fragmentary perspective view of a portion of the electrophotographic support and shows the electrical circuit for the solenoid; and i FIG. 3 is a diagrammatic, fragmentary, side elevation of an alternative form of the invention in which lugs on the timing belt are engageable with the carriage to move it across the exposure slit.
  • an electrophotographic drum D which is rotatably mounted about a shaft 10 and includes an electrophotographic transparent support, such as arcuate plate 11.
  • the plate may be provided with an electrophotographic surface and, if desired, may extend the full circumference of the drum.
  • a photoconductor 12 is fed from the supply roll 13 across arcuate plate 11 to a takeup roll 14. Suitable means for advancing the material is shown in my commonly assigned copending US. application Ser. No. 777,717, filed Nov. 21, 1968, now abandoned.
  • the drum may be driven by suitable drive means such as shaft 10, by a power source (not shown) in a counterclockwise direction, as indicated in FIG. I so that photoconductor l2 first moves past a charging station 15 so that a generally uniform electrostatic charge is placed on the photoconductive material.
  • the photoconductor then moves past an exposure station so that the image projected by lens system 16 is projected onto the photoconductive material through the transparent support 11.
  • the electrostatic charge will be dissipated leaving a latent electrostatic charge image which may be developed by development station 17.
  • a receiver or copy sheet is fed from a supply 18 by a suitable feed means 19 so as to be brought into face-to-face relationship with the photoconductor I2 at a transfer station 21.
  • the transfer station may comprise a corona charger for placing a charge on the back surface of the copy sheet having a polarity opposite that of the toner particles so that they will be attracted to the copy sheet'
  • This copy sheet can then be separated from the drum by a piclcoff means 22, fully described in commonly assigned copending US. application Ser. No. 861,508, filed on even date herewith.
  • the copy sheet passes through a fusing station 23 so that the image can be fixed to the copy sheet. Any residual toner particles left on the photoconductor 12 can be removed therefrom connects the carriage and the belt as the photoconductor apat acleaning station 24.
  • a carriage C for supporting an original document such as document is mounted, as on rollers 26, for movement along a rail 27 so as to move the document past an exposure slit 28, illustrated as formed in the shield of a light source 29 whereby the original document is illuminated so that an image thereof is reflected by mirror 30 through lens system 16 and plate 11 onto photoconductive material 12 to form the latent electrostatic image.
  • the original document 25 may be positioned upon a. transparent platen, such as platen 31 made of transparent material such as glass or plastic and is held in position by an opaque flexible cover 32 which conveniently is fixedly attached along one edge of the carriage.
  • the carriage is normally held in the left-hand position, shown in dotted lines in FIG.
  • An endless drive means such as endless belt 36, is provided for moving the carriage in response to movement of drum D which belt extends around the drum and around the pair of spaced pulleys 37 and 38 on opposite sides of exposure slit 28, as shown.
  • a switch 39 which rides along a peripheral edge of plate 11, as best seen in FIG. 2, is closed completing a circuit to solenoid 44).
  • a clamp such as solenoid 40, is energized causing armature 41 to clamp or grip belt 36 to move carriage C along with the belt.
  • the carriage may be constructed of relatively lightweight material so that the inertia to be overcome in accelerating it is relatively small.
  • FIG. 3 An alternative arrangement is shown in FIG. 3 wherein a belt 36' extending around spaced pulleys 37 and 38 is provided with spaced lugs 42 which engage corresponding spaced lugs 43 on carriage C causing the carriage to be moved past an exposure slit so that an image may be projected onto photoconductor 12.
  • lug 42 rides off of lug 43 as that portion of belt 36' moves around pulley 38'.
  • belt 36 may be a timing belt to prevent slippage between it and the drum around which it extends.
  • a novel electrophotographic apparatus wherein a carriage which is movable past an exposure slit is recycled with the movement of a photoconductive surface past an exposure station so that the angular speed of the photoconductive surface is the same as the linear speed of the carriage whereby a charged photoconductive surface is exposed to form a latent electrostatic image which is toned and transferred to a receiver sheet in a subsequent operation.
  • electromagnetic means such as a solenoid, is provided to grip an endless belt driven by the electrophotographic drum so that the carriage is moved past the exposure slit while the photoconductive surface is moved past an exposure station.
  • the solenoid is deenergized as the photoconductor passes the end of the exposure station so that the carriage is returned to its initial position by a force exerting means such as a weight.
  • lugs are provided on the timing belt which engage lugs on a carriage, the lugs being appropriately spaced so that a lug is in carriage-engaging position just as the leading end of the photoconductor reaches the exposure station so that the carriage is moved across the expo sure slit in timed relation with the movement of the photoconductor.
  • the lug on the timing belt disengages with the lug on the carriage so that the carriage is free to be returned to its initial position.
  • an electrophotographic apparatus including:
  • a support for a photoconductive member said support being movable through a cycle along an endless path into and out of a series of operating stations, one of said stations being an exposure station;
  • said improvement further including:
  • An exposure device for an electrophotographic apparatus having a photoconductive element, said photoconductive element being movable along an endless path into and out of an exposure station for exposure to a document movable along a linear path from an initial position past an exposure slit to a final position, said device comprising:
  • An exposure device for an electrophotographic apparatus wherein an original document is movable along a linear path to expose a photoconductive element to an image of the document as the photoconductive element is moved along a circular path into and out of an exposure station, said device comprising:
  • a rotatably mounted drum having a peripheral surface which includes an arcuate plate for supporting the photoconductive element for movement along the circular path;

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Optical Systems Of Projection Type Copiers (AREA)
US861511A 1969-09-26 1969-09-26 Exposure system Expired - Lifetime US3635554A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86151169A 1969-09-26 1969-09-26

Publications (1)

Publication Number Publication Date
US3635554A true US3635554A (en) 1972-01-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
US861511A Expired - Lifetime US3635554A (en) 1969-09-26 1969-09-26 Exposure system

Country Status (5)

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US (1) US3635554A (enExample)
CA (1) CA920208A (enExample)
DE (1) DE7035667U (enExample)
FR (1) FR2063031B1 (enExample)
GB (1) GB1330655A (enExample)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819261A (en) * 1970-11-04 1974-06-25 Minolta Camera Kk Transfer type electrophotographic duplicating apparatus
JPS5099155A (enExample) * 1973-12-27 1975-08-06
US3923391A (en) * 1972-09-24 1975-12-02 Mita Industrial Co Ltd Electrostatic photographic copying apparatus
US3960446A (en) * 1973-05-08 1976-06-01 Minolta Camera Kabushiki Kaisha Electrostatic copying apparatus
FR2338510A1 (fr) * 1976-01-19 1977-08-12 Rex Rotary International As Dispositif d'entrainement de chariot d'exposition pour machine a copier les documents
US4297023A (en) * 1978-07-31 1981-10-27 Konishiroku Photo Industry Co., Ltd. Electrophotographic copying apparatus
US4340297A (en) * 1979-02-21 1982-07-20 Konishiroku Photo Industry Co., Ltd. Device for driving copy board of a copying machine
US4474452A (en) * 1981-05-13 1984-10-02 Pitney Bowes Inc. Safety device for cam yoke used in electrophotocopier reciprocating carriage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977188A (en) * 1933-08-08 1934-10-16 William R Kunz Windshield wiper
US2243013A (en) * 1939-02-27 1941-05-20 Lloyd W Morey Therapeutic apparatus
US2939321A (en) * 1956-12-19 1960-06-07 John P Wuerthner Curve translator
US2959095A (en) * 1957-06-03 1960-11-08 Rca Corp Office copying machine
US3062108A (en) * 1955-02-07 1962-11-06 Xerox Corp Electrophotographic copying apparatus
US3062109A (en) * 1959-07-02 1962-11-06 Xerox Corp Xerographic reproducing apparatus
US3486819A (en) * 1966-10-07 1969-12-30 Addressograph Multigraph Manual control for copying machine
US3489020A (en) * 1966-09-29 1970-01-13 Meteor Ag Drive mechanism for a to-and-fro movable carriage

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1977188A (en) * 1933-08-08 1934-10-16 William R Kunz Windshield wiper
US2243013A (en) * 1939-02-27 1941-05-20 Lloyd W Morey Therapeutic apparatus
US3062108A (en) * 1955-02-07 1962-11-06 Xerox Corp Electrophotographic copying apparatus
US2939321A (en) * 1956-12-19 1960-06-07 John P Wuerthner Curve translator
US2959095A (en) * 1957-06-03 1960-11-08 Rca Corp Office copying machine
US3062109A (en) * 1959-07-02 1962-11-06 Xerox Corp Xerographic reproducing apparatus
US3489020A (en) * 1966-09-29 1970-01-13 Meteor Ag Drive mechanism for a to-and-fro movable carriage
US3486819A (en) * 1966-10-07 1969-12-30 Addressograph Multigraph Manual control for copying machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819261A (en) * 1970-11-04 1974-06-25 Minolta Camera Kk Transfer type electrophotographic duplicating apparatus
US3923391A (en) * 1972-09-24 1975-12-02 Mita Industrial Co Ltd Electrostatic photographic copying apparatus
US3960446A (en) * 1973-05-08 1976-06-01 Minolta Camera Kabushiki Kaisha Electrostatic copying apparatus
JPS5099155A (enExample) * 1973-12-27 1975-08-06
FR2338510A1 (fr) * 1976-01-19 1977-08-12 Rex Rotary International As Dispositif d'entrainement de chariot d'exposition pour machine a copier les documents
US4297023A (en) * 1978-07-31 1981-10-27 Konishiroku Photo Industry Co., Ltd. Electrophotographic copying apparatus
US4340297A (en) * 1979-02-21 1982-07-20 Konishiroku Photo Industry Co., Ltd. Device for driving copy board of a copying machine
US4474452A (en) * 1981-05-13 1984-10-02 Pitney Bowes Inc. Safety device for cam yoke used in electrophotocopier reciprocating carriage

Also Published As

Publication number Publication date
DE7035667U (de) 1971-02-04
FR2063031A1 (enExample) 1971-07-02
CA920208A (en) 1973-01-30
GB1330655A (en) 1973-09-19
FR2063031B1 (enExample) 1973-01-12

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