US3021817A - Copying of documents - Google Patents

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Publication number
US3021817A
US3021817A US782603A US78260358A US3021817A US 3021817 A US3021817 A US 3021817A US 782603 A US782603 A US 782603A US 78260358 A US78260358 A US 78260358A US 3021817 A US3021817 A US 3021817A
Authority
US
United States
Prior art keywords
toner
guide surface
pile
layer support
curved
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
US782603A
Other languages
English (en)
Inventor
Limberger Walter
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.)
Lumoprint Zindler KG and Co GmbH
Original Assignee
Lumoprint Zindler KG and Co GmbH
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
Priority claimed from DE1956L0025710 external-priority patent/DE1266128B/de
Priority to CH728261A priority Critical patent/CH364801A/de
Priority to GB22267/59A priority patent/GB864040A/en
Priority to US678685A priority patent/US2972332A/en
Priority claimed from US678685A external-priority patent/US2972332A/en
Application filed by Lumoprint Zindler KG and Co GmbH filed Critical Lumoprint Zindler KG and Co GmbH
Priority to US782603A priority patent/US3021817A/en
Application granted granted Critical
Publication of US3021817A publication Critical patent/US3021817A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/082—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer for immersion

Definitions

  • My present invention relates to a device for rendering visible a latent electrostatic image by means of a toner by distributing pigment particles onto a xerographic layer in which the latent electrostatic image is located.
  • a longitudinally loop-shaped open-topped container for receiving a pile of toner and guide devices for the layer support is provided whereby this support is guided under the toner pile with simultaneous agitation of the toner.
  • the invention provides the important advantage that an intensive and uniform covering of the latent electrostatic image With the toner is insured, whereby through the advance of the layer support a continuous agitation and movement of the particles of the toner lying directly upon the upwardly facing Xerographic layer are insured.
  • unused particles of the toner for example glass spheres which are provided with pigment particles, are continually supplied to the Xerographic layer.
  • the agitating movement of the toner particles produced enhances transfer of the pigment particles to the xerographic-layer support.
  • an open-topped container is formed by a guide surface on which a toner pile is located and through which the layer support is guided under this pile.
  • the guide surface is inclined to the direction of the advance of the layer'support, which is guided over conveying rollers, for example, arranged so that the forward edge of the layer support is deflected by the guide surface in the direction towards the toner pile. It has been found that, by the inherent stiffness of the layer support, its forward edge slides along the guide surface so that the layer support is moved between the guide surface and the toner pile.
  • the guide surface is advantageously arched in a U shape and may be curved in a plane which lies perpendicular to the direction of advance of the layer support; in a particularly preferred embodiment, however, the plane in which the guide surface is curved lies perpendicular to the layer support and parallel to its direction of advance.
  • the end of the guide surface over which the layer support is withdrawn is inclined upwardly.
  • the guide surface has straight, upwardly diverging entrance and exit slopes inclined outwardly in different directions and connected by a preferably uniformly curved center part. This provides that the toner pile merely rests in the curved part of the guide surface, the upper edge of the pile preferably lying beneath the beginning of the curved section.
  • the guide surface is perforated before and/or after the section on which "ice the toner pile is located.
  • This construction has the advantage that foreign particles, particularly dust and the like, can fall downwardly during the advance of the layer support before the latter arrives at the toner pile.
  • These perforations may be associated with a suction device adapted to urge the back of the layer support into firm contact with the guide surface, the suction device preferably acting on the layer support through one or more perforations of the guide surface located ahead of the toner pile.
  • the part of the guide surface which lies behind the toner pile as seen in the direction of advance of the layer support is made pivotable.
  • the pivot point is preferably located beyond the toner pile.
  • a periodic oscillation can be effected by an agitator, in order to return excess pigment particles to the pile.
  • FIG. 1 shows a side view of an apparatus according to the invention in section
  • FIG. 2 shows a side view of another embodiment in section.
  • a guide surface 51 as seen in the direction of advance of the layer support, has a straight front part 52 and a likewise straight rear part 53. These two parts are inclined with their upper ends diverging. The lower ends are interconnected by a curved section 54. Within the guide surface, which is formed as an upwardly open shell, is located the toner pile 55. In the embodiment illustrated the toner substantially fills the curved section 54, so that the layer support guided along the upper side'of the guide surface 51 is pressed with its front edge continually onto the guide surface because of its stiffness.
  • the guide surface is itself supported in a frame 56.
  • This frame carries Walls 57 which la.erally enclose the guide surface.
  • feed means 58, 59 are disposed above the guide surface 5.1.
  • the feed means are merely indicated at the supply side of the layer support although they may be provided at either or both ends. They consist of rollers which may be yieldingly pressed together and guide the layer support 6% in a rredetermined direction perpendicular to the plane 61 connecting the axes of the rollers 58, 59.
  • This direction represented by a plane tangent to both rollers, is inclined towards the direction 62 of the front part 52 of the guide surface, so that the forward edge 63 of the layer support 69 contacting the guide surface is bent towards the toner pile 55. This insures that the layer support is guided directly along the guide surface and can push under the toner pile S5.
  • the arrangement is such that the distance from the feed means 58, 59 along the guide surface 51 up to the feed means (not shown) behind the rear part 53 of the guide surface 51 is smaller than the length of the layer support, so that the layer support, after it has left the feed means 58, 59, is further advanced by the feeding devices located beyond the member 51.
  • a larger casing (not shown) having slots for the insertion and the withdrawal of successive sheets 69, such casing usually also containing conventional means for producing a latent electrostatic image on the xerographic layer, by successively subjecting it to an electric field and a photographic exposure, and for fixing the developed image by a fusion process.
  • the guide surface 64 is curved in a vertical plane which runs parallel to the direction of advance.
  • the toner pile 65 is guided by directing surfaces 66, 67,
  • the rear directing surface 67 being curved to increase agitation of the toner.
  • the agitation of the toner is also augmented by a stirrer element 68- projecting into the toner pile 65.
  • the guide surface 64 includes a several apertures 70 in front of the toner pile 65 or in front of the directing surface 66. These apertures are so arranged that their axes on the upper side of the guide surface 64 do not intersect the toner pile 65. Furthermore, additional directing surfaces 71, 72 are provided beneath the guide surface as a means for directing the flow of air through the apertures 70 parallel to the axes of the apertures 70.
  • the channel formed by the directingsurfaces 71, 72 is connected to the suction side ofa fan 73.
  • This fan may form part of the ventilation system of the apparatus, care being taken to prevent withdrawal of the total air volume through the channel formed by the directing surfaces 71, 72 so that merely a lower pressure is produced in this channel.
  • This lower pressure serves to guide the layer support smoothly on the upper side of the guide surface 64 in the direction of the arrow 69,, whereby dust particles or the like, which may be located on the upper side of the guide surface 64, fall through the apertures 70.
  • An apparatus for developing electrostatic images on flexible sheets comprising a trough-shaped stationary toner support with a pair'of side walls flanking a partly curved, upwardly concave stationary guide member having a continuous sheet-supporting upper surface, a pile of comminuted toner deposited in the concavity of said member and confined by said side walls, and feed means for moving a flexible sheet carrying an upwardly facing Xerographic layer across said upper surface and under said pile, thereby temporarily exposing said layer to the action of said toner, said guide member having a curved center portion merging into two substantially planar and upwardly sloping diverging end portions, said toner pile being substantially limited to said center portion, said feed means including sheet-driving means positioned above said guide member in a region between the planes of said end portions and forwardly of said center portion for directing said sheet downwardly onto the forward one of said end portions head of said toner pile.
  • An apparatus as described in claim 2 further comprising front and rear wall elements above said guide member preventing said pile from spreading onto said end portions, said wall elements being separated from said guide member by a distance sufficient to let said sheet ass. p 3.
  • said feed means comprises a pair of co-operating rollers positioned adjacent said forward one of said end portions, the latter including an acute angle with a plane tangent to both of said rollers whereby said sheet is deflected at said forward end portion toward said center portion.
  • An apparatus for developing electrostatic images on flexible sheets comprising a stationary guide member having a continuous sheet-supporting upper surface, said surfacebeing formed with a curved, upwardly concave central portion and with two substantially rectilinear portions divergingly sloping upwardly from said curved portion and merging into the latter at the front and the rear thereof, respectively, a pair of co-operating transport rollers positioned adjacent the forward one of said sloping portions, said forward portion including an acute angle with a plane tangent to both of said rollers whereby a flexible sheet carrying on its upper face a latent electrostatic image can be directed by said rollers onto said sheet-supporting surface ahead of said curved portion, and stationary side walls flanking said curved portion for confining thereon a pile of comminuted toner adapted to develop a latent image on said sheet upon passage thereof between said surface and said pile.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Cleaning In Electrography (AREA)
  • Dry Development In Electrophotography (AREA)
US782603A 1956-08-29 1958-12-23 Copying of documents Expired - Lifetime US3021817A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CH728261A CH364801A (de) 1956-08-29 1957-07-15 Vorrichtung zum Sichtbarmachen eines latenten elektrostatischen Bildes
GB22267/59A GB864040A (en) 1956-08-29 1957-07-17 Improvements in or relating to apparatus for developing electrostatic images
US678685A US2972332A (en) 1956-08-29 1957-08-16 Apparatus for developing latent electrostatic image on an elongated flexible support
US782603A US3021817A (en) 1956-08-29 1958-12-23 Copying of documents

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2972332X 1956-08-29
DE1956L0025710 DE1266128B (de) 1956-09-11 1956-09-11 Vorrichtung zum Entwickeln eines Ladungsbildes
US678685A US2972332A (en) 1956-08-29 1957-08-16 Apparatus for developing latent electrostatic image on an elongated flexible support
US782603A US3021817A (en) 1956-08-29 1958-12-23 Copying of documents

Publications (1)

Publication Number Publication Date
US3021817A true US3021817A (en) 1962-02-20

Family

ID=32398063

Family Applications (1)

Application Number Title Priority Date Filing Date
US782603A Expired - Lifetime US3021817A (en) 1956-08-29 1958-12-23 Copying of documents

Country Status (3)

Country Link
US (1) US3021817A (de)
CH (1) CH364801A (de)
GB (1) GB864040A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117030A (en) * 1959-02-21 1964-01-07 Azoplate Corp Electrophotographic developing process and apparatus
US3123501A (en) * 1961-04-22 1964-03-03 Electrophotographic developing apparatus
US3348960A (en) * 1965-02-17 1967-10-24 Gilbert Paul Powder application
US3411932A (en) * 1964-09-23 1968-11-19 Xerox Corp Quality xerographic reproductions
US3503776A (en) * 1966-02-21 1970-03-31 Xerox Corp Xerographic development
US3599604A (en) * 1968-01-11 1971-08-17 Xerox Corp Xerographic development apparatus
US3899997A (en) * 1972-09-14 1975-08-19 Ronald Frederick Ayers Thermographic apparatus
US4002145A (en) * 1973-08-16 1977-01-11 Develop Kg/Dr. Eisbein And Co. Apparatus for applying and fixing a magnetizable powder on a charged sheet
US4265196A (en) * 1976-09-27 1981-05-05 Am International, Inc. Toner applicator apparatus
US4414913A (en) * 1980-07-18 1983-11-15 Sarda Jean Lucien Thermo-engraving machine for printing in relief

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US656502A (en) * 1900-03-24 1900-08-21 New Process Coating Company Galvanizing apparatus.
US906827A (en) * 1905-08-28 1908-12-15 Edwin G Staude Feed device for flexible-box-making machines.
US2345656A (en) * 1941-02-04 1944-04-04 Crown Cork & Seal Co Method of and apparatus for delivering sheet material to presses or the like
US2363805A (en) * 1941-10-13 1944-11-28 Ronald Winthrop Apparatus for preparing surgical plaster bandages
US2614655A (en) * 1943-08-10 1952-10-21 Sidney H Katz Filter material
US2761416A (en) * 1953-01-02 1956-09-04 Battelle Development Corp Development mechanism for electrostatic images
US2832511A (en) * 1955-02-18 1958-04-29 Haloid Co Generator of an aerosol of powder particles
US2851373A (en) * 1955-11-21 1958-09-09 Bruning Charles Co Inc Developing electrostatic latent images on photo-conductive insulating material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US656502A (en) * 1900-03-24 1900-08-21 New Process Coating Company Galvanizing apparatus.
US906827A (en) * 1905-08-28 1908-12-15 Edwin G Staude Feed device for flexible-box-making machines.
US2345656A (en) * 1941-02-04 1944-04-04 Crown Cork & Seal Co Method of and apparatus for delivering sheet material to presses or the like
US2363805A (en) * 1941-10-13 1944-11-28 Ronald Winthrop Apparatus for preparing surgical plaster bandages
US2614655A (en) * 1943-08-10 1952-10-21 Sidney H Katz Filter material
US2761416A (en) * 1953-01-02 1956-09-04 Battelle Development Corp Development mechanism for electrostatic images
US2832511A (en) * 1955-02-18 1958-04-29 Haloid Co Generator of an aerosol of powder particles
US2851373A (en) * 1955-11-21 1958-09-09 Bruning Charles Co Inc Developing electrostatic latent images on photo-conductive insulating material

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3117030A (en) * 1959-02-21 1964-01-07 Azoplate Corp Electrophotographic developing process and apparatus
US3123501A (en) * 1961-04-22 1964-03-03 Electrophotographic developing apparatus
US3411932A (en) * 1964-09-23 1968-11-19 Xerox Corp Quality xerographic reproductions
US3348960A (en) * 1965-02-17 1967-10-24 Gilbert Paul Powder application
US3348527A (en) * 1965-02-17 1967-10-24 Simmons Christopher Powder application
US3503776A (en) * 1966-02-21 1970-03-31 Xerox Corp Xerographic development
US3599604A (en) * 1968-01-11 1971-08-17 Xerox Corp Xerographic development apparatus
US3899997A (en) * 1972-09-14 1975-08-19 Ronald Frederick Ayers Thermographic apparatus
US4002145A (en) * 1973-08-16 1977-01-11 Develop Kg/Dr. Eisbein And Co. Apparatus for applying and fixing a magnetizable powder on a charged sheet
US4265196A (en) * 1976-09-27 1981-05-05 Am International, Inc. Toner applicator apparatus
US4414913A (en) * 1980-07-18 1983-11-15 Sarda Jean Lucien Thermo-engraving machine for printing in relief

Also Published As

Publication number Publication date
GB864040A (en) 1961-03-29
CH364801A (de) 1962-10-15

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