US3615130A - Wet type photostatic device with length control - Google Patents

Wet type photostatic device with length control Download PDF

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Publication number
US3615130A
US3615130A US802024A US3615130DA US3615130A US 3615130 A US3615130 A US 3615130A US 802024 A US802024 A US 802024A US 3615130D A US3615130D A US 3615130DA US 3615130 A US3615130 A US 3615130A
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US
United States
Prior art keywords
original
copying
wet type
copying paper
rocking
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
US802024A
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English (en)
Inventor
Shigeru Suzuki
Tadatoshi Sakamaki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
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Publication of US3615130A publication Critical patent/US3615130A/en
Anticipated expiration legal-status Critical
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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
    • G03G15/225—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 using contact-printing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G17/00—Electrographic processes using patterns other than charge patterns, e.g. an electric conductivity pattern; Processes involving a migration, e.g. photoelectrophoresis, photoelectrosolography; Processes involving a selective transfer, e.g. electrophoto-adhesive processes; Apparatus essentially involving a single such process

Definitions

  • the present invention relates to an electronic photographic copying device and more particularly a device for copying a copy whose pattern is formed by the electronic photographic copying method.
  • the copying device of the type described is utilized when it is desired to obtain a plurality of copies after only one exposure step or when it is desired to obtain a second copy by direct exposure photocopying method.
  • a wet process type electronic photographic or electrostatic photocopying method in a mixture in which finely divided powder of a photoconductive material such as zinc oxide dispersed in a binder is applied over a substrate such as paper, thereby forming a photoconductive layer; electrically charging this photoconductive layer; forming an electrostatic latent image upon the photoconductive layer by exposure; and thereafter applying to the exposed photoconductive layer a processing solution in which toner obtained by processing into resinous form finely divided material such as carbon black is suspended in a carrier having a high electrical resistance, thereby developing the latent image.
  • a photoconductive material such as zinc oxide dispersed in a binder
  • the features of the wet process type electrostatic photographic method are high resolution because of the development process with the use of finely divided particles, simple and easy to attain continuous tones, capable of providing a reversed image if necessary and clean operation because finely divided particles are not scattered.
  • the substrate upon which is formed a coating of photoconductive material is generally made of an opaque paper and the photoconductive layer or coating such as zinc oxide has generally a tendency to absorb the light especially the spectrum effective to photocopying. Therefore, the advantage of the use of transparent substrate is not fully utilized in practice. Therefore, the copy obtained by the wet process type electrostatic photography, for which there are many applications, cannot be used as it is, as an original for direct exposure type photocopying.
  • the primary object of the present invention is to provide a wet process type electrostatic photographic device simple in construction and efficient in operation, providing a plurality of copies only by one exposure step and eliminating the defect of the conventional wet process method of the type described by forming an image upon a transparent paper or the like such Patented Oct. 26, 1971 as tracing paper so as to provide an original adapted for use in direct exposure type photocopying.
  • the present invention provides the arrangement as described hereinafter.
  • the copying paper and the original are inserted into the copying device through independent inlets and their leading edges are abutted against the nip of a pair of feed rollers held stationally so as to align these side edges with each other. This can be done by observing the alignment through the inlet.
  • the original and the copying paper can be correctly superposed one upon the other for processing.
  • they are electrically charged.
  • the present invention provides a switch actuating device for controlling the time when the feed rollers as well as the charging device are' actuated and stopped.
  • This actuation timing adjustment can be attained by adjusting the angle of rotation of a rocking member adapted to actuate an actuating element of a switch which opens or closes a power supply circuit to the feed roller drive and to the discharging device.
  • FIG. 1 is a sectional view of one embodiment of a wet type electronic photographic copying device according r' to the present invention.
  • FIG. 2 is a perspective view of one example of a switch actuating device employed in the device shown in FIG. 1.
  • a wet type electronic photographic copying device is generally designated by reference numeral 1.
  • an original holder 2 is directed through an inlet 4 an original 3 having an image formed by the wet type electronic photographic method and is held in position with the leading edge 3a of the original held between a nip of a pair of rollers 6 and 7 pressed against each other after passing through a processing solution tray 5.
  • the original 3 must be so positioned that its image side is directed upwardly.
  • the processing solution 12 is supplied to the processing solution tray or saucer 5 through a pipe 11 from a processing solution reservoir 8.
  • the original 3 is wetted with the processing solution when passing through the processing solution tray or saucer 5 and the processing solution is returned to the reservoir 8 from a drain 14. That is, the processing solution in the tray or saucer 5 is circulated by the pump 10 and is similar to the type used as a carrier which is a mother liquor of a processing solution used in the above described wet type electronic photographic copying method.
  • a transparent copying paper such as tracing paper and the like is inserted into an inlet 16 with the surface being directed downwardly in FIG. 1.
  • the copying paper 15 is then held stationary with its leading edge 15a abutted against the nip of the rollers 6 and 7 as in the case of the original 3.
  • both of the leading edges 3a and 15a must be aligned. Since the inlet 16 is relatively wider, the operation of aligning the leading edge 15a of the copying paper 15 with that of the original 3 can be made in a simple manner while observing the operation through the inlet 16.
  • a pushbutton 17 for a switch (not shown) is depressed so as to actuate a motor 18. Consequently, the rollers 7 and 219 are rotated in the directions indicated by the arrows through a suitable transmission mechanism (not shown) such as chains, sprocket wheels, etc. Thus, the mating rollers 6 and 19 are also rotated in the directions indicated by the arrows respectively and concurrently a charging device generally designated by reference numeral 21 is energized.
  • the charging device 21 is arranged and disposed such that electrically insulating thread such as nylon thread is wound in a wide pitch around an elongated frame member 23 having a bottom; wire electrodes 24 are extended in the frame member 23; and the open side of the elongated frame member 23 is disposed in opposition to an electrode roller 25 having the opposite polarity to that of the wire electrodes 24. Across these electrodes 24 and 25a is applied a high voltage so as to cause a corona discharge therebetween, thereby imparting charges to the original 3 and the copying paper 15 passing between these electrodes.
  • a guide member 26 made of a wire is provided in order to prevent the wetted original 3 from being wound around the electrode roller 25 and the roller 7, a guide member 26 made of a wire is provided.
  • the wire guide member 26 is folded so as to loosely fit into peripheral grooves formed in both of the roller 7 and the electrode roller 25 and both ends of the wire guide member are fixedly secured to pins 27a and 27b respectively while the straight portion is maintained in horizontal position.
  • the original 3 maintained in superposed relation with the copying paper 15 with the surface 15b thereof in contact with the pattern 3b of the original is held between the rollers 6 and 7, imparted with a suitable pressure therefrom and directed toward the charging device 21 Since toner forming the pattern 3b of the original is wetted by the processing solution as described above, when the pattern 3b is pressed against the surface of the copying paper 15 by a suitable pressure to such an extent that the pattern 1511 may not be destroyed, the toner 3c is mechanically transferred to the surface 15b of the copying paper.
  • the superposed original and copying paper is subjected to corona discharge in the charging device 25 so that a charge having a polarity opposite to that of the toner 30 upon the original 3 is applied to the rear surface of the copying paper 15. Consequently, the pattern 3b upon the original 3 and the surface 15b of the copying paper 15 are closely attracted to each other by the electrostatic force.
  • the attracted and superposed original and copying paper are further directed out of the copying device 1 by means of the pair of rollers 19 and 20.
  • a charge having the opposite polarity to that of the original charge is applied to the rear surface of the copying paper 15 by the discharging device 25 again.
  • the original 3 is removed from the copying paper 15, still leaving substantially 80% of the toner on the side of the original 15 so that this original may be used again for further copyingt
  • the pushbutton 17 which is depressed after the leading edges 3a and 15a of the original 3 and the copying paper 15 have been aligned with each other at the contact portion of the pair of rollers 6 and 7 is operatively interconnected to a switch actuating device 28 as shown in FIG. 2, thereby controlling the timing of the actuation of the motor 18 as well as the charging device 21.
  • a rocking member 29 has its base end 29a fitted loosely over a pivot 30 fixed to a stationary member of the copying device 1.
  • the rocking member 29 is imparted with a tendency to rotate in the counterclockwise direction as indicated by the arrow a and also to move downwardly as indicated by the arrow b by means of a spring 31 so that a bent portion 32 formed at the extremity 29b of the rocking member 29 is always pressed against the screw threads 712.
  • a rocking lever 34- is rotatably carried by a shaft 33 fixed to the side plate of the copying device 1 and is imparted with a tendency to rotate in the counterclockwise direction in FIG. 2 by means of a spring 35.
  • this rocking lever 34 is limited by stop pins 36 and 37 disposed below the ends 34a and 34b of the rocking lever 34 respectively.
  • the pushbutton 17 is fixed to the end 34a of the rocking lever 34 while a pushup' lever 38 is fixed to the other end 3417.
  • the pushup lever 38 extends below the rocking member 29' so that when the pushbutton 17 is depressed, the rocking member 29 is pushed upwardly by the lever 38, whereby the bent portion 32 at the extremity 29b of the rocking member is released from the engagement with the threaded portion 7b of the shaft 7a. Consequently, the rocking member 29 is caused to rotate in the direction of the arrow a by the aforementioned tendency and in the direction of the arrow 6 by the force of the spring 31.
  • Adjacent to the extremity 29b of the rocking member 29 is formed another bent portion 39 independently of the bent portion 32 and adapted to abut against the cam-shaped stopper 4'0 disposed in the path of rotation of the rocking member 29. More specifically the stopper 40 is located at a position corresponding to the starting end of the screw threaded portion 7b of the shaft 7a. When the bent portion 39 abuts against this stopper 40 and thereafter when the pushbutton 17 is released, the side edge 32a of the bent portion 32 presses against the above described starting end of the threaded portion 7b by its tendency.
  • the side edge 32a of the bent portion 32 is displaced in the direction opposite to the direction indicated by the arrow a by means of the threaded portion 7b.
  • a normally-opened microswitch 41 electrically interconnected to the power supply circuit of the photocopying machine 1.
  • the stopper 40 is rotatably carried by a shaft 42 fixed to the stationary member of the copying device 1 and is so arranged as to be rotated to a suitable position by means of a knob 43 fixedly secured to the shaft 42. Therefore, the position at which the peripheral edge portion of the stopper 40 abuts against the bent portion 39 of the rocking member 29, that is the initial position of the rocking member 29 is adjusted by the knob 43.
  • the knob 43 is provided with an index mark 43a while a stationary member disposed peripherally of the knob 43 is graduated with scales adapted to indicate an energizing time which is varied depending upon the sizes of the original or copying paper. Thus, the energizing time is controlled by setting the index mark 43a to a suitable graduated scale.
  • the leading edges of the copying and original can be aligned at the contact portion of a pair of rollers held stationarily while observing this alignment operation so that the misalignment between the original and copying paper can be completely eliminated when they are fed between the rollers.
  • the present invention has another salient advantage to render an electronic photographic copying device compact in size and simple in construction.
  • a wet type electronic photographic copying device wherein a copy to be made is independently inserted into the device to be superposed with its leading edge visually aligned with the leading edge of an original and moved through said device comprising:
  • roller means located downstream of said processing tray to receive said superposed original and copy; motor means for selectively driving said roller means; charging means located downstream of said roller means for transferring an image from said original to said copy;
  • rocking lever pivotally mounted on one end and subjected to means tending to force said rocking lever downwardly and in a counterclockwise direction
  • rocking lever having its other end normally engaged with a rotatable threaded member forcing said rocking lever in a clockwise direction;
  • rocking member mounted on said device and selectively operated by a pushbutton to pivot said rocking lever upwardly out of engagement with said threaded member thereby closing said switch as said lever is moved upwardly and counterclockwise, said switch closing effective energizing of said motor means and said charging means for a time determined by the movement of said rocking lever in a clockwise direction;
  • timing means associated with said rocking lever for determining said energization.
  • timing means comprises a cam selectively settable for abutting a portion of said rocking lever to determine the end of the counterclockwise movement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Wet Developing In Electrophotography (AREA)
US802024A 1968-02-29 1969-02-25 Wet type photostatic device with length control Expired - Lifetime US3615130A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1308168 1968-02-29

Publications (1)

Publication Number Publication Date
US3615130A true US3615130A (en) 1971-10-26

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ID=11823204

Family Applications (1)

Application Number Title Priority Date Filing Date
US802024A Expired - Lifetime US3615130A (en) 1968-02-29 1969-02-25 Wet type photostatic device with length control

Country Status (3)

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US (1) US3615130A (enrdf_load_stackoverflow)
DE (1) DE1910322C3 (enrdf_load_stackoverflow)
GB (1) GB1257951A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4306802A (en) * 1980-09-15 1981-12-22 Apeco Corporation Cassette and heating arrangement for photocopy machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4306802A (en) * 1980-09-15 1981-12-22 Apeco Corporation Cassette and heating arrangement for photocopy machine

Also Published As

Publication number Publication date
GB1257951A (enrdf_load_stackoverflow) 1971-12-22
DE1910322C3 (de) 1973-01-04
DE1910322B2 (de) 1972-06-15
DE1910322A1 (de) 1970-01-29

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