US3726520A - Apparatus for automatically conveying sheets of paper by means of electrostatic adsorption - Google Patents

Apparatus for automatically conveying sheets of paper by means of electrostatic adsorption Download PDF

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Publication number
US3726520A
US3726520A US00062477A US3726520DA US3726520A US 3726520 A US3726520 A US 3726520A US 00062477 A US00062477 A US 00062477A US 3726520D A US3726520D A US 3726520DA US 3726520 A US3726520 A US 3726520A
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United States
Prior art keywords
film
sheet
stack
drum
paper
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Expired - Lifetime
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US00062477A
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English (en)
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T Doi
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Hitachi Ltd
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Hitachi Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/18—Separating articles from piles using electrostatic force
    • 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
    • Y10S271/00—Sheet feeding or delivering
    • Y10S271/901—Magnetic operation

Definitions

  • an apparatus For automatically conveying sheets of paper one after another from the top of a stack of sheets of paper to a predetermined position by taking advantage of the electrostatic adsorption phenomenon, an apparatus comprises sheet of paper carrier means electrostatically charged by charging means, means for supporting said carriermeans in parallel opposed relation to the sheet of paper to pick up said sheet of paper under electrostatic force and means for releasing the sheet of paper from said carrier means after the sheet of paper is located in the predetermined position, whereby the sheets of paper can be fed automatically regardless of the thickness of the sheets of paper, the presence or absence of a folded line or wrinkles in the sheets of paper and the type of paper.
  • the present invention relates to an apparatus for automatically conveying sheets of paper by means of electrostatic adsorption.
  • the object of the present invention is to obviate the above-described drawback of the conventional apparatus, and to make it possible to convey stacked sheets of paper automatically one after another from the top thereof by taking advantage of the electrostatic adsorption phenomenon, i.e. by adsorbing the individual sheet of paper onto electrostatically charged carrier means.
  • FIG. 1 is a diagrammatic illustration of an embodiment of the present invention.
  • FIGS. 2a, 2b, 2c, and 2d are a set of illustrative views diagrammatically showing the operation of the apparatus of FIG. 1.
  • FIGS. 3 and 4 are diagrammatic illustrations of another embodiment of the present invention.
  • reference numeral 1 designates a soft steel drum (hereinafter referred to as drum for simplicity) which rotates with an original sheet lapped thereon.
  • drum a soft steel drum
  • Reference numeral 2 designates a thin, tough, transparent plastic film having a thickness of the order of 50 pi and made of polyethylene terephthalate or the like material.
  • the plastic film 2 has one end 3 secured to the drum 1, with the other end being provided with a magnet 5 having a book 4 at a portion thereof.
  • Reference numeral 6 designates a drawing member adapted to engage the hook 4 of the magnet 5 provided at one end of the film 2. The drawing member 6 is pulled by traction means while being guided by a guide rail, whereby the hook 4 of the magnet 5 is drawn in the direction of the arrow shown in FIG. 2(b).
  • Reference numeral 7 designates a corona charger which charges the film 2 with static charge when impressed with a high voltage.
  • Reference numeral 8 designates original sheets, for example, for facsimile, stacked on a stacking table 9, and 10 designates a guide plate on which a used original sheet 8 is withdrawn.
  • Reference numeral 11 designates a knife edge-like scraper plate provided at the end of the stacking table 9 adjacent the drum 1 for preventing the original sheet from being again placed on the stacking table 9 after it has been fed onto the drum 1 by the film 2.
  • the drum 1 which is driven by a synchronized motor (not shown), is operatively con nected to said motor through a slip connection, e.g., through a friction clutch, it rotates in a direction (of the arrow shown in FIG. 2(a)) opposite to the normal rotating direction (as indicated by the arrow in FIG. 2(b)) while being urged to rotate in the normal direction. Since the film 2 is now charged, the uppermost sheet 8 is attracted onto the film 2. Therefore, when the drawing member 6 is returned in a direction as shown in FIG. 2(b), the drum 1 winds up the film 2 and the sheet 8 attached thereto, while rotating in the normal direction. As the drawing member 6 is returned further forward (to the left as viewed in FIG.
  • the drawing member 6 is again pulled as shown in FIG. 2(d) and brought into engagement with the book 4, so that the film 2 is drawn out over the stacking table 9 while being charged by the charger '7.
  • the used original sheet 8' is mechanically peeled from the film 2 by the scraper plate 11 provided at the forward end of the stacking table 9, and discharged to the outside of the apparatus by being guided by the guide plate 10
  • the state of the film 2 after it has been fully drawn out and stretched over the stacking table 9, is the same as that shown in'FIG. 2(a). Therefore, by repeating the above-described operation, the original sheets 8 can automatically be fed onto the drum 1 one after another and automatically be removed therefrom through the guide plate 9, in a positive manner.
  • the charge remains on the film 2 from one cycle to another, but re-charging of the charged film does not cause any substantial problem. Nevertheless, it is possible to impart a suitable electric conductivity to the film 2 so that the charge will gradually disappear during the period of the scanning and light to electricity conversion process, by reason of the fact that a relating long time is required for said process after the original sheet 8 has been electrostatically attracted onto the film 2 and wound around the drum 1.
  • the film 2 it is also possible to coat the film 2 with a dielectric, transparent, organic, photoconductive material, such as polyvinylcarbazole or pyrazoline, so that the charge on the film 2 may be dissipated by the light during the light-electricity conversion process, after operating the steps of charging the film 2 and winding the same on the drum 1 in adark place.
  • a dielectric, transparent, organic, photoconductive material such as polyvinylcarbazole or pyrazoline
  • the adsorption of the sheet 8 onto the film 2 may be attained by a method wherein the film 2 is charged by the rotational friction of a fur adhered to the drum 1, or by a method wherein a high voltage is directly impressed on a transparent metallic film (e.g. a copper iodide film) formed on the film 2 by vacuum evaporation or on a transparent antistatic coating (e.g. Colcoat) formed on said film.
  • a transparent metallic film e.g. a copper iodide film
  • a transparent antistatic coating e.g. Colcoat
  • the stacking table 9 is held in a lowered position until the film 2 is drawn out over the stack of the sheet 8, is moved upwardly after the film 2 has been charged and completely drawn out, and is again lowered slowly after the uppermost sheet has been adsorbed on the film 2, and thereafter the film 2 is wound on the drum 1, whereby a more positive feeding operation can be obtained.
  • reference numeral 21 designates sheets of paper stacked on a stacking table 22 which is secured to one end of a lever 23.
  • Reference numeral 24 designates a pivot pin on which the lever 23 is pivotably mounted, and to the other end of the lever 23 is connected an iron core 26 which is attracted by a solenoid 25.
  • a spring 27 is anchored to the aforesaid one end of the lever 23, by which the stacking table 22 is held in a lowered position in the de-energized state of the solenoid 25.
  • Reference numeral 28 designates a belt consisting of a tough plastic film (e.g. a polyethylene terephthalate film having a thickness of the order of 50 t) and engaged around rollers 29, 29' in an endless state.
  • the belt 28 is disposed above the stack of paper 21, with the lowerlength thereof extending in spaced parallel relation to the latter, and is driven by the roller 29.
  • Reference'numeral 30 designates chargers for charging the belt 28, which are arranged inside of said belt 28 along the lower length thereof in opposed relation thereto.
  • Reference numeral 31 designates a charge eraser for erasing the static charge, imparted to the belt 28 by the chargers 30, therefrom by neutralizing the same, said charge eraser being a device substantially similar to the chargers 30.
  • Reference numeral 32 designates a machine, e.g. a facsimile apparatus, in which the sheet of paper 21 is to be mounted, and the belt 28 and the facsimile apparatus 32 is associated with each other by a slide plate 33.
  • Reference numeral 34 designates a guide plate provided above the slide plate 33, with one end thereof closely spaced from the belt 28. The guide plate serves to peel the sheet of paper 21 from the belt 28 and simultaneously to guide the sheet of paper introduced into the facsimile apparatus while sliding on the slide plate 33.
  • Reference numeral 35 designates a scanning lightelectricity converter of the facsimile apparatus 32, and below the scanning light-electricity converter 35 are provided a conveyor belt 37, engaged around rollers 36,36, and press rollers 38 for pressing the sheet of paper 21 against said conveyor belt.
  • a receptacle 39 is provided at the forward end of the conveyor belt 37 for receiving a used sheet of paper.
  • a voltage is impressed on the chargers 30 at this time, so that the lower length of the endless belt 28, opposed by said chargers 30, is charged and the uppermost sheet of paper 21 is electrostatically adsorbed on the belt 28.
  • the current supply to the solenoid 25 is interrupted and the stacking table 22 is lowered.
  • the current supply to the chargers 30 is also interrupted at the same time but the sheet of paper 21, electrostatically adsorbed on the belt 28, is retained thereon.
  • the rollers 29, 29 are rotated under such condition, to drive the belt 28.
  • the current supply to the charge eraser 31 need not be interrupted intermittently but can be continued throughout the period of operation of the apparatus.
  • the sheet of paper 21 is completely released from the belt 28 and fed into the facsimile apparatus 32, through the slide plate 33.
  • the sheet of paper 21 is transported by the conveyor belt 37 and the press rollers 38. During this period, the information on the sheet of paper 21 is converted into electric signals by the scanning light-electricity converter 35.
  • the used sheet of paper 21 is discharged through an outlet opening of the facsimile apparatus and received in the receptacle 39.
  • the sheets of paper 21 stacked on the stacking table 22 are successively individually adsorbed on the belt 28, introduced into the facsimile apparatus 32 and received in the receptacle 39 after use.
  • the facsimile apparatus 32 may be eliminated by providing the scanning light-electricity converter 35 beneath the endless belt 28 and intermediary between the chargers 30 and the charge eraser 31, so as to convert the information on the sheet of paper into an electric signal during the period from the time when said sheet of paper is charged by said chargers 30 to the time when the charge on the sheet of paper is erased by said charge eraser 31.
  • the sheet of paper 21 may be released from the belt 28 mechanically by the upper end of the guide plate 34, as in the preceding embodiment, instead of providing the charge eraser 31.
  • the apparatus of the present invention has been described and illustrated herein with particular reference to the case wherein it is used with the transmitter of a facsimile apparatus, it will be obvious to those skilled in the art that the apparatus can similarly be used with the receiver of the facsimile apparatus, a copying machine or a printing machine.
  • the sheets of paper are photosensitive papers, such as photographic films or printing papers
  • printing is possible through the transparent film 2 and, therefore, these photosensitive papers can be automatically fed by the apparatus of this invention, simply by replacing the sheets of paper with the photosensitive papers.
  • the apparatus of the invention can also be effectively used for the automatic mounting and demounting and automatic feeding of recording papers.
  • the apparatus of the invention can be used with a recording system of the type wherein an electric signal is converted into an electromagnetic vibration to thereby apply a pressure to record on a single sheet of pressure-sensitive paper, only by arranging such that the magnet 5 and the hook 4 provided thereon are located inwardly of the surface of the drum 1.
  • the film 2 need not be transparent.
  • sheets of paper are individually handled by being electrostatically adsorbed over the entire surface thereof. Therefore, the operation is more reliable than that of the conventional apparatuswherein sheets of paper are pulled or rubbed at a portion by mechanical means, and automatic feeding or automatic mounting and demounting of sheets of paper can be achieved satisfactorily, with no fear of erroneous operation, even if the sheets of paper to be handled include sheets of paper of different qualities, or folded or ruptured sheets of paper.
  • first moving means including means for rotatably driving at least one of said belt rollers for moving the film means to a first predetermined position where a planar surface of the film means is located parallel to and adjacent to a sheet at the top of said stack, at least a portion of the film means having been electrostatically charged by said charging means such that the sheet is electrostatically ad sorbed to the film at least when the film is in said first position,
  • second moving means for moving the film means and adsorbed sheet from the first position to a second predetermined position spaced from said stack, releasing means for releasing said sheet from said film means after the film means and adsorbed sheet have been moved from the first position, and stack conveying means for intermittently positioning the stack in a position adjacent the endless belt,
  • said stack conveying means includes a pivotal lever, biasing means, and a solenoid means, said stack being supported at one portion of the lever which is normally biased downwardly by said biasing means, said solenoid means being operably connected to another portion of said lever for raising the one portion, said solenoid means including means to position the stack adjacent the belt when a sheet is to be transferred to the belt from the stack.
  • An apparatus characterized in that the charging means are located between the belt rollers within the space surrounded by the endless belt.
  • An apparatus characterized in that said releasing means comprises discharging means for discharging the electrostatic charge on the belt, said discharging means being located adjacent the path of the belt in a position closer to the second predetermined position than is the charging means.
  • An apparatus characterized in that said discharging means is located between the belt rollers within the space surrounded by the endless belt.
  • An apparatus characterized in that the releasing means includes a rigid guide plate arranged adjacent the belt roller positioned closest to said predetermined second position.
  • An apparatus characterized in that said releasing means includes means for introducing the sheet to a conveyorsystem in a facsimile apparatus.
  • first moving means for moving the film means to a first predetermined position where a planar surface of the film means is located parallel to and adjacent to a sheet at the top of said stack, at least a portion of the film means having been electrostatically charged by said charging means such that the sheet is electrostatically adsorbed to the film at least when the film is in said first position,
  • second moving means for moving the film means and adsorbed sheet from the first position to a second predetermined position spaced from said first stack
  • said film means is a film of predetermined length having one end fixed to the surface of a rotatable drum.
  • first moving means for moving the film means to a first predetermined position where a planar surface of the film means is located parallel to and adjacent to a sheet at the top of said stack, at least a portion of the film means having been electrostatically charged by said charging means such that the sheet is electrostatically adsorbed to the film at least'when the film is in said first position,
  • second moving means for moving the film means and adsorbed sheet from the first position to a second predetermined position spaced from said first stack
  • said second moving means including means for rotating the drum and thereby wind the film and the adsorbed sheet positioned radially inwardly of the film onto the surface of the drum, said releasing means includedin means for releasing said sheet from the film while he first moving means is unwinding the film preliminarily to obtaining another sheet.
  • An apparatus characterized in that said film has a film hook at the end opposite the end fixed to the drum, and in that said first moving means includes a hook releasably engageable with said 11.
  • An apparatus characterized in that said drum includes ferromagnetic materials, and in that said film has a permanent magnet adjacent said film hook for attaching the end of the film to the drum when the film hook is out of engagement with the hook of the moving means, whereby the sheet of paper is held in position against the drum during the time the respective hooks are released from one another.
  • said releasing means includes a rigid plate member positioned adjacent the film path near the place on the circumference of the .drum where the film starts winding onto the drum such that when the film is unwound from the drum the sheet is deflected away from the film by said plate member.
  • An apparatus characterized in that said drum is constructed so as to be positionable with respect to light-electricity converter means so that the sheet can be scanned by the converter means while the sheet is on the drum.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Advancing Webs (AREA)
  • Facsimiles In General (AREA)
US00062477A 1969-08-13 1970-08-10 Apparatus for automatically conveying sheets of paper by means of electrostatic adsorption Expired - Lifetime US3726520A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44063536A JPS5126815B1 (enrdf_load_stackoverflow) 1969-08-13 1969-08-13

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US3726520A true US3726520A (en) 1973-04-10

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JP (1) JPS5126815B1 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927877A (en) * 1973-04-20 1975-12-23 Fuji Xerox Co Ltd Paper feed tray for use with copying machine and the like
US4285114A (en) * 1979-11-15 1981-08-25 Underdahl Alfred J Method for transferring circular paper filters from a stack of such filters into a coffee maker basket
EP0074044A1 (de) * 1981-09-05 1983-03-16 Weitmann & Konrad GmbH & Co. KG Bogenbremse
US4397542A (en) * 1982-03-03 1983-08-09 Xerox Corporation Xerographic envelope printing
EP0113115A3 (en) * 1983-01-03 1985-04-17 Coulter Systems Corporation Electro-static sheet feeding method and apparatus
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
US5062764A (en) * 1990-01-08 1991-11-05 Robert A. Foisie Method and apparatus using electrostatic charges to stabilize the upper sheets of a stack of paper
US5176374A (en) * 1989-11-30 1993-01-05 Ricoh Company, Ltd. Paper transporting device for image forming equipment
US5219154A (en) * 1990-10-11 1993-06-15 Ricoh Company, Ltd. Sheet feeding and separating device for image forming equipment
US5224693A (en) * 1991-10-22 1993-07-06 Ricoh Company, Ltd. Multistage paper feeding/conveying apparatus and method that uses electro static forces
US5228373A (en) * 1990-01-08 1993-07-20 Robert A. Foisie Method and apparatus using electrostatic charges to temporarily hold packets of paper
US5255904A (en) * 1991-11-20 1993-10-26 Ricoh Company, Ltd. Feeder or image forming apparatus
US20170174455A1 (en) * 2014-08-22 2017-06-22 Canon Kabushiki Kaisha Sheet feeding apparatus and image forming apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4347094A (en) * 1979-04-05 1982-08-31 Sawara Mfg. Works Co., Ltd. Label applying apparatus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US287957A (en) * 1883-11-06 Electrical apparatus for and method of controlling paper
US1916109A (en) * 1933-06-27 Other material while
US2305512A (en) * 1938-11-12 1942-12-15 Int Cigar Mach Co Method of transferring leaf sections, and binder or wrapper holder for cigar machines
US2576882A (en) * 1946-09-04 1951-11-27 Hartford Nat Band And Trust Co Device for conveying paper and similar substances
US3339915A (en) * 1964-06-26 1967-09-05 Cie Du Filage Des Mataux Et De Method and apparatus for handling ferromagnetic sheets
US3450402A (en) * 1967-07-12 1969-06-17 Xerox Corp Sheet stripper apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2221776A (en) * 1938-09-08 1940-11-19 Chester F Carlson Electron photography
US3087403A (en) * 1961-04-12 1963-04-30 Gen Aniline & Film Corp Diazotype printing and developing apparatus
JPS4112374Y1 (enrdf_load_stackoverflow) * 1964-09-30 1966-06-10
JPS4316078Y1 (enrdf_load_stackoverflow) * 1965-10-02 1968-07-04

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US287957A (en) * 1883-11-06 Electrical apparatus for and method of controlling paper
US1916109A (en) * 1933-06-27 Other material while
US2305512A (en) * 1938-11-12 1942-12-15 Int Cigar Mach Co Method of transferring leaf sections, and binder or wrapper holder for cigar machines
US2576882A (en) * 1946-09-04 1951-11-27 Hartford Nat Band And Trust Co Device for conveying paper and similar substances
US3339915A (en) * 1964-06-26 1967-09-05 Cie Du Filage Des Mataux Et De Method and apparatus for handling ferromagnetic sheets
US3450402A (en) * 1967-07-12 1969-06-17 Xerox Corp Sheet stripper apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3927877A (en) * 1973-04-20 1975-12-23 Fuji Xerox Co Ltd Paper feed tray for use with copying machine and the like
US4285114A (en) * 1979-11-15 1981-08-25 Underdahl Alfred J Method for transferring circular paper filters from a stack of such filters into a coffee maker basket
EP0074044A1 (de) * 1981-09-05 1983-03-16 Weitmann & Konrad GmbH & Co. KG Bogenbremse
US4397542A (en) * 1982-03-03 1983-08-09 Xerox Corporation Xerographic envelope printing
EP0113115A3 (en) * 1983-01-03 1985-04-17 Coulter Systems Corporation Electro-static sheet feeding method and apparatus
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
US5176374A (en) * 1989-11-30 1993-01-05 Ricoh Company, Ltd. Paper transporting device for image forming equipment
US5062764A (en) * 1990-01-08 1991-11-05 Robert A. Foisie Method and apparatus using electrostatic charges to stabilize the upper sheets of a stack of paper
US5228373A (en) * 1990-01-08 1993-07-20 Robert A. Foisie Method and apparatus using electrostatic charges to temporarily hold packets of paper
US5219154A (en) * 1990-10-11 1993-06-15 Ricoh Company, Ltd. Sheet feeding and separating device for image forming equipment
US5224693A (en) * 1991-10-22 1993-07-06 Ricoh Company, Ltd. Multistage paper feeding/conveying apparatus and method that uses electro static forces
US5255904A (en) * 1991-11-20 1993-10-26 Ricoh Company, Ltd. Feeder or image forming apparatus
US20170174455A1 (en) * 2014-08-22 2017-06-22 Canon Kabushiki Kaisha Sheet feeding apparatus and image forming apparatus

Also Published As

Publication number Publication date
JPS5126815B1 (enrdf_load_stackoverflow) 1976-08-09

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