US3896451A - Electrostatic recording apparatus with automatic movement of the recording electrodes between a recording and a nonrecording position - Google Patents

Electrostatic recording apparatus with automatic movement of the recording electrodes between a recording and a nonrecording position Download PDF

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Publication number
US3896451A
US3896451A US344137A US34413773A US3896451A US 3896451 A US3896451 A US 3896451A US 344137 A US344137 A US 344137A US 34413773 A US34413773 A US 34413773A US 3896451 A US3896451 A US 3896451A
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US
United States
Prior art keywords
recording
electrode means
path
electrode
sheet
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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
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US344137A
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English (en)
Inventor
Kyoji Omi
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Ricoh Co Ltd
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Ricoh Co Ltd
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Publication date
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Publication of US3896451A publication Critical patent/US3896451A/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
    • G03G15/32—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 the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/321—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 the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image
    • G03G15/325—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 the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image using a stylus or a multi-styli array
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • the invention relates to electrostatic recording devices. More particularly, it is concerned with an apparatus in which an electrostatic latent image is formed by applying electrical signals on electrostatic recording paper in sheet form moving between opposing recording electrode means and back electrode means, and the electrostatic latent image which has been soformed is later developed into a visible image.
  • An object of the invention is to obviate the disadvantages of the prior art electrostatic recording devices discussed above, and to provide a device which has the recording efficiency previously possible only with devices using continuous webs, but to avoid waste of paper, and to provide the savings in paper previously possible only whenusing electrodes that are spaced from each other by a suitable gap and record on individual sheets of paper.
  • the invention resides in arranging recording electrode means and back electrode means for movement toward and away from each other, and in providing first paper sensor means and second paper sensor means disposed anterior to and posterior to the two electrode means respectively as seen in the direction of movement of electrostatic recording paper, and means for causing the two electrode means to move toward each other when both sensor means have sensed paper and for causing them to move away from each other when at least one of the sensor means stops sensing paper.
  • FIG. 3 is a perspective view of the means for moving and driving the pair of paper feed rollers and for moving the back electrode means.
  • FIG. 4 is a perspective view of a second paper sensor.
  • FIG. 5 shows an electric circuit used in the apparatus of FIG. 1.
  • the recording apparatus 1 of a facsimile receiver comprises recording electrode means 2 and back electrode means 3 facing each other.
  • a pair of paper feed rollers 4 and 5 are disposed anterior to the two electrode means and another pair of paper feed rollers 6 and 7 are disposed posterior thereto as seen in the direction of movement of recording paper (not shown).
  • Upper rollers S and 7 of the two pairs of paper feed rollers, which are follower rollers, and the back electrode means 3 are mounted on a frame 8.
  • the frame 8 is pivotally supported by a shaft 8A and adapted to move to an upper position as shown in broken lines, so that the rollers 5 and 7 and the back electrode means 3 can be moved to the upper position with the frame 8.
  • the electrodes 2 and 3 can be separted from each other.
  • a large number of pin electrodes are arranged on an electrode surface 2A of the recording electrode means 2. Voltages are impressed selectively on the pin electrodes as signals are applied from an outside source (not shown) while a sheet of electrostatic recording paper (not shown) moves along the path between the recording electrode means 2 and the back electrode means 3, so that an electrostatic latent image can be formed on the electrostatic recording paper.
  • the electrostatic recording paper on which the electrostatic latent image is formed is delivered by the paper feed rollers 6 and 7 to a developing station (not shown) where the latent image is developed into a visible image.
  • paper sensor means 9 is disposed anterior to the electrode surface 2A of the recording electrode means 2 and another paper sensor means 10 is disposed posterior thereto as seen in the direction of movement of paper.
  • the first sensor means 9 comprises a light source 1 l and a light receiving element 12 which are arranged such that, when paper is not disposed below the first sensor 9, the light emanating from the light source 11 is not incident on the light receiving element 12, and when paper moves below the first sensor 9, the light emanating from the light source 11 is reflected by the paper and is incident on the light receiving element 12, thereby permitting the passage of paper to be ascertained.
  • the second sensor means 10 comprises, as shown in FIG. 4, a lever 13 including an upper arm 13A disposed in the path of movement of paper, a light source 14 and a light receiving element 15.
  • the lever 13 includes a lower arm 138 which is adapted to be disposed between the light source 14 and the light receiving element 15 to intercept the light emanating from the former and prevent the same from being incident on the latter.
  • the lever 13 is pivotally supported by a shaft 16 and is normally urged by the biasing force of a helical spring 17 wound on the shaft 16 to move such that the lower arm 13B is disposed in front of the light receiving element to prevent the light from the light source 14 from being incident on the light receiving element 15.
  • the lever 13 is pivoted about the shaft 16 to move the lower arm 13B into a position in which it is out of index with the light receiving element 15. This permits the light emanating from the light source 14 to be incident on the light receiving element 15, so that the sensor means 10 senses the arrival of the sheet of paper.
  • the pair of rollers 6 and 7 are formed with annular grooves 6A and 7A respectively at their central portions.
  • the upper arm 13A of the lever 13 is aligned at its upper end with the annular grooves 6A and 7A.
  • the lower rollers 4 and 6 of the pair of rollers are driven for rotation by an electric motor 18 through a timing belt 19, a pulley 20 engaged by the timing belt 19, a pinion 21 fixed to the pulley 20 and two gears 22 and 23 which are in meshing engagement with the pinion 21.
  • a so lenoid 24 including a plunger 24A which supports the right arm of a lever 25 pivoted at 25A, with the left arm of the lever 25 being in contact with the front arm of a lever 26 which is pivoted at 26A and normally urged to move counterclockwise by the biasing force of a spring 27.
  • the back arm of the lever 26 is urged by the biasing force of the spring 27 to move into contact with a pin 28 projecting laterially from the right end of the back electrode means 3 and extending through an opening 29 formed in a side plate.
  • Pivotal movement of lever 26 causes the back electrode means 3 resting on the other arm of lever 26 by its own weight through the arm 28 to move downwardly, so that the back electrode means 3 moves to a recording position in which it is against the electrode surface 2A, with the electrostatic recording paper being interposed at this time between the electrodes 2 and 3.
  • the electrodes 2 and 3 are against each other, in the recording position shown in solid lines in FIG. 1, but when the recording paper does not cover the entire locality between the sensors 9 and 10, i.e., when either sensor is not sensing recording paper, the electrodes 2 and 3 are moved away from each other, to the nonrecording position shown in FIG. 2.
  • the apparatus embodying the invention causes the two electrode means 2 and 3 to move toward each other when a sheet of electrostatic recording paper is sensed by both the first and second sensor 9 and 10, and to move away from each other when no recording paper is sensed by onev of both sensors, thereby ensuring that no short-circuiting of the two electrode means 9 and 10 can occur.
  • the apparatus according to the invention permits sheets of paper of any desired length to be used, because the two electrode means are moved toward and away from each other by sensing the leading and the trailing end of the paper.
  • the first and second sensor means each may include two or more individual sensors, so that a sheet of electrostatic paper fed in an inclined position can .be positively sensed.
  • An electrostatic recording apparatus comprising means for moving a recording sheet along a defined path, recording electrode means disposed at the other side of the path, means for supporting the electrode means, means for detecting the presence of a recording sheet at a defined portion of said path to provide control signals in response to detecting the presence of a sheet at said defined portion of the path, means responsive to the said control signals from the detecting means for causing the support means to maintain the two electrode means at a recording position adjacent and facing each other across said path when a sheet is present at said defined portion of the path and to maintain the two electrode means at a nonrecording position away from each other when no sheet is present at said defined portion of the path and to move the electrode means between said two positions, said defined portion of the path including the path portion which is between the two electrode means when the electrode means are at their recording position, wherein the detecting means comprises first sensor means disposed in g the path of the recording sheet preceding at least one of the electrode means and second sensor means disposed in the path of the recording sheet after at least one of the electrode means, as
  • An electrostatic recording apparatus as in claim 1 wherein the supporting means comprises a frame carrying one of said electrode means and means for pivotally supporting the frame for movement between a recording position in which the two electrode means are at their recording position and a nonrecording position which the two electrode means are at their nonrecording position.
  • An electrostatic recording apparatus as in claim 3 wherein the means for moving the recording sheet comprises a first and a second pair of feed rollers, with the first pair disposed before the electrode means and the second pair disposed after the electrode means as seen in the direction of movement of the recording sheet, each of said pair comprising a lower and an upper roller, with the upper roller of each pair secured to said frame and movable therewith between the recording and nonrecording position of the frame.
  • the support means and the means for causing the support means to maintain the electrode means in said recording and nonrecording position comprise a lever, means for pivotally supporting the lever for movement between a recording position at which the two electrode means are at their recording position and a nonrecording position at which the two electrode means are at their non-recording position, said lever engaging the support means for at least one of the electrode means, and electric circuit means responsive to the actuation of both switches to cause the lever to move to its recording position and responsive to the lack of actuation of either switch to cause the lever to move to its nonrecording position.
  • An electrostatic recording apparatus as in claim 6 wherein the electrical circuit means comprises a relay actuated when both the first and the second switch are actuated, a solenoid energized when the relay is actuated, and means responsive to the energized state of the solenoid to move the lever to its recording position and responsive to the nonenergized state of the solenoid to move the lever to its nonrecording position.
  • An electrostatic recording apparatus as in claim 7 including means for normally biasing the lever to its nonrecording position.
  • An electrostatic recording apparatus comprising: means for moving a recording sheet along a defined path; recording electrode means disposed at one side of the path, and back electrode means disposed at the other side of the path; means for supporting the electrode means for motion toward and away from each other, between a recording position at which the electrode means are close to each other and a nonrecording position at which the electrode means are further away from each other; means for detecting the presence of a continuous length of a recording sheet within a continuous span of said path, which span has a portion before and a portion after the electrode means, as seen in the direction of movement of the sheet along the path, to provide first type control signals in response thereto, and for detecting the absence of a sheet at any portion of said span to provide second type control signals; means for moving the electrode means to said recording position in response to said first type control signals and for maintaining the electrode means at said recording position until the detecting means provide said second type control signals, and for moving the electrode means to said nonrecording position in response to said second type control signals and for maintaining the electrode means at

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Paper Feeding For Electrophotography (AREA)
US344137A 1972-04-12 1973-03-23 Electrostatic recording apparatus with automatic movement of the recording electrodes between a recording and a nonrecording position Expired - Lifetime US3896451A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3610372A JPS5332705B2 (enrdf_load_stackoverflow) 1972-04-12 1972-04-12

Publications (1)

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US3896451A true US3896451A (en) 1975-07-22

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US344137A Expired - Lifetime US3896451A (en) 1972-04-12 1973-03-23 Electrostatic recording apparatus with automatic movement of the recording electrodes between a recording and a nonrecording position

Country Status (6)

Country Link
US (1) US3896451A (enrdf_load_stackoverflow)
JP (1) JPS5332705B2 (enrdf_load_stackoverflow)
CA (1) CA993495A (enrdf_load_stackoverflow)
DE (1) DE2316942C2 (enrdf_load_stackoverflow)
FR (1) FR2179797B1 (enrdf_load_stackoverflow)
GB (1) GB1419326A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2324033A1 (fr) * 1975-09-12 1977-04-08 Versatec Dispositif du type enregistreur/traceur montable dans un espace tres reduit et procede de fabrication d'un tel dispositif
US4276829A (en) * 1978-01-31 1981-07-07 Wu Chen Mechano-electrostatic charge-imaging method and apparatus
US4297716A (en) * 1976-07-30 1981-10-27 Canon Kabushiki Kaisha Recording apparatus including a continuous transfer web
US4516141A (en) * 1981-11-30 1985-05-07 Mita Industrial Company Limited Electrostatic recording apparatus
US4518975A (en) * 1981-11-30 1985-05-21 Mita Industrial Company Limited Electrostatic recording apparatus
US20090257800A1 (en) * 2008-04-09 2009-10-15 Fuji Xerox Co., Ltd. Position detection apparatus, paper thickness detection apparatus, belt position detection apparatus, and image forming apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5376720U (enrdf_load_stackoverflow) * 1976-11-29 1978-06-27
JPS5542469A (en) * 1978-09-21 1980-03-25 Ricoh Co Ltd Picture scanning recorder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700701A (en) * 1951-12-13 1955-01-25 Western Union Telegraph Co Facsimile receiving apparatus
US3444315A (en) * 1965-10-01 1969-05-13 Xerox Corp Facsimile alarm circuit
US3591170A (en) * 1968-03-22 1971-07-06 Int Computers Ltd Error-indicating devices
US3609238A (en) * 1968-08-16 1971-09-28 Dhm Research & Dev Corp High-speed data printout
US3757352A (en) * 1970-03-11 1973-09-04 Eg & G Inc Digitally pulsed dielectric line scan recorder

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD80929A (enrdf_load_stackoverflow) *
DE1221649B (de) * 1963-04-02 1966-07-28 Standard Elektrik Lorenz Ag Schreibkopf fuer Mosaikdrucker, dessen Aufzeichnungstraeger angefeuchtet ist
DE1474006A1 (de) * 1964-10-02 1969-08-07 Wanderer Werke Ag Koeln Ausschwenkbare Schreibwalze in Rechen-,Buchungs -und dergleichen Maschinen
JPS5227621U (enrdf_load_stackoverflow) * 1975-08-19 1977-02-26

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700701A (en) * 1951-12-13 1955-01-25 Western Union Telegraph Co Facsimile receiving apparatus
US3444315A (en) * 1965-10-01 1969-05-13 Xerox Corp Facsimile alarm circuit
US3591170A (en) * 1968-03-22 1971-07-06 Int Computers Ltd Error-indicating devices
US3609238A (en) * 1968-08-16 1971-09-28 Dhm Research & Dev Corp High-speed data printout
US3757352A (en) * 1970-03-11 1973-09-04 Eg & G Inc Digitally pulsed dielectric line scan recorder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2324033A1 (fr) * 1975-09-12 1977-04-08 Versatec Dispositif du type enregistreur/traceur montable dans un espace tres reduit et procede de fabrication d'un tel dispositif
US4042939A (en) * 1975-09-12 1977-08-16 Xerox Corporation Printer/plotter style system for confined installation and method
US4297716A (en) * 1976-07-30 1981-10-27 Canon Kabushiki Kaisha Recording apparatus including a continuous transfer web
US4276829A (en) * 1978-01-31 1981-07-07 Wu Chen Mechano-electrostatic charge-imaging method and apparatus
US4516141A (en) * 1981-11-30 1985-05-07 Mita Industrial Company Limited Electrostatic recording apparatus
US4518975A (en) * 1981-11-30 1985-05-21 Mita Industrial Company Limited Electrostatic recording apparatus
US20090257800A1 (en) * 2008-04-09 2009-10-15 Fuji Xerox Co., Ltd. Position detection apparatus, paper thickness detection apparatus, belt position detection apparatus, and image forming apparatus
US8706018B2 (en) * 2008-04-09 2014-04-22 Fuji Xerox Co., Ltd. Position detection apparatus, paper thickness detection apparatus, belt position detection apparatus, and image forming apparatus

Also Published As

Publication number Publication date
FR2179797A1 (enrdf_load_stackoverflow) 1973-11-23
DE2316942C2 (de) 1982-06-09
GB1419326A (en) 1975-12-31
JPS5332705B2 (enrdf_load_stackoverflow) 1978-09-09
JPS48104537A (enrdf_load_stackoverflow) 1973-12-27
DE2316942A1 (de) 1973-10-25
CA993495A (en) 1976-07-20
FR2179797B1 (enrdf_load_stackoverflow) 1976-09-10

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