US3791731A - Transport means for sheets - Google Patents

Transport means for sheets Download PDF

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Publication number
US3791731A
US3791731A US00306872A US3791731DA US3791731A US 3791731 A US3791731 A US 3791731A US 00306872 A US00306872 A US 00306872A US 3791731D A US3791731D A US 3791731DA US 3791731 A US3791731 A US 3791731A
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US
United States
Prior art keywords
core
copying machine
coil spring
axis
spring
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
US00306872A
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English (en)
Inventor
N Mihalik
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.)
Gestetner Byfleet Ltd
Original Assignee
Gestetner Byfleet Ltd
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 Gestetner Byfleet Ltd filed Critical Gestetner Byfleet Ltd
Application granted granted Critical
Publication of US3791731A publication Critical patent/US3791731A/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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6529—Transporting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines

Definitions

  • a transport roller for forwarding sheets bearing un M fused electrostatographic images in copying apparatus "355/3 R29/ comprises a core with a coiled spring wound there 11 d, th f th th 58 Field of Search 355/3 R, 3 DD, 17; 271/51, arou" e 0 e surmu mg e we When the roller is used a minimal distortion or smearing of the powder images occurs.
  • This invention relates to transport means for sheets.
  • the invention relates to a transport roller for forwarding sheets of paper bearing unfused electrostatographic powder images.
  • an electrostatic image is formed on a photoconductive surface, such as the surface of a drum, by charging the drum and exposing it to a light image, so
  • the image is then developed by one of the well known methods such as by cascading toner particles over the surface of the drum such that they adhere to the charged areas of the drum in the image pattern.
  • the so developed image is then transferred to a copy sheet, such as a sheet of paper, which is urged against the surface of the drum.
  • the sheet is subsequently forwarded to a fusing zone, wherein heat fusing or solvent vapour fusing of the powdered image takes place.
  • the sheet must be trans ported from the station whereat it contacts the drum to the fusing zone and this transportation can present difficulties caused by the unfused powdered image bea coming smeared or otherwise disturbed.
  • toner material may itself be disturbed, and the electrostatic image may also be disturbed, particularly in dry developing situations, where, in contrast to wet development, no insulating liquid is present to protect the electrostatic image.
  • a liquid in wet developing, protects the electrostatic image and also protects the toner from a roller surface.
  • a sheet bearing an unfused elec- I trostatog raphic powder image can be forwarded without the image becoming smeared by a transport means including a transport roller which comprises a core about which is wound a coil spring with the axis of the coils of the spring surrounding the core.
  • the present invention provides a transport roller for forwarding sheets bearing unfused electrostatographic powder images including a core about which is wound a coil spring with the axis of the coilsof the spring surrounding the core.
  • While the invention can be applied to both wet and dry developed copy sheets, and any other type of sheet, it is particularly advantageous with dry development where difficulty has previously been particularly encountered in forwarding copy sheets.
  • the axis of the coils of the spring is itself disposed in helical form about the-core, and the spacing between successive turns of the spring around the core may suitably be such that they very nearly touch or do so.
  • the spring is preferably electrically conductive and it is preferably made of wire.
  • the spring is suitably stretched under light tension and suitably may be fixed at each end by means of the wire of which it is formed being inserted through a hole in the core.
  • One suitable form of roller comprises a core of three-eighths inch diameter with a wire coil spring of outside diameter one-eighth inch wound around it. The overall outside diameter of the roller is then five-eighths inch; suitably the diameter of the vwire is between 0.01 and 0.05 inches, and preferably 003 inches.
  • the spring may be stretched so that at the core surface the distance between the wire in adjacent coils of the spring is equal to the wire diameter.
  • the invention also provides an electrostatographic copying machine wherein electrostatic images are formed and developed with toner particles and are then transferred to copy sheets, including such a roller for forwarding the copy sheets.
  • the roller may be provided in a forwarding arrange ment to co-operate with any other sort of roller or surface provided that the imaged sides of the sheets contact the roller with the coil spring. It is however possible to provide two such rollers to co-operate for forwarding sheets, and this will particularly be useful in cases where double images are provided, one on each side of the sheet.
  • the diameter of the rollers may be selected according to the size of machine and speed of forwarding required. I
  • rollers of the invention are satisfactory for forwarding sheets bearing unfused images. It may be that it is the fact that there is an incomplete outer surface in the outer envelope of the roller which is important, as the sheet and unfused image will only be contacted over a part of their areas when forwarded by the roller. This part or point contact may also be expected to be associated with an apparent lack of disturbance of the electrostatic field which holds the toner on the sheet during forwarding in contrast to a roller with a complete surface which might itself become charged, and thus create such a disturbance. A lack of disturbance of the image would, we believe follow from this feature. It may again be that it is the resilience of the rollers which is important, or, again that the various factors are to gether required in a satisfactory roller.
  • FIG. 1 is a longitudinal side view of one form of roller according to the invention.
  • FIG. 2 is a sectional view taken upon the line AA of FIG. 1;
  • the roller shown in FIGS. 1 and 2 of the drawings comprises a core 1 surrounded by a wire coilspring 2.
  • Hub shafts 4 extend from the end of the core 1.
  • the hub shafts extend into bearings in frame members 7 of an electrostatographic copying machine.
  • the spring 2 is fixed on the core by the wire of the spring having a straight portion 3 inserted through a hole 5 in the core at each end thereof. An end of the straight portion is bent to prevent unwanted withdrawal.
  • the spring is wound in helical fashion around the core under light tension, and on the interior of the winding at the surface of the core adjacent coils of wire are approximately a distance apart equal to their diameter.
  • a roller of the type illustrated has been fitted into a electrostatographic copying machine between the image transfer point and the fusing unit, and was driven in co-operation with a rubber roller and with a slight pressure thereagainst. Over 25,000 copies were made and passed between the two rollers without any effect on the unfused tained on the sheets.
  • An electrostatographic copying machine wherein electrostatic images are formed and developed with toner particles and are then transferred to a copy sheet, said machine including a transport roller for forwarding sheets bearing unfused powder images, said transport roller having an axis about which it is rotatable and comprising in combination an elongate core extending lengthwise of said axis and a coil spring, having convolutions wound about an axis said coil spring axis being wound in turns around said core.
  • a copying machine as claimed in claim 6 wherein the coil spring comprises convolutions of a filament touching said core with the distance between adjacent convolutions of the spring where they touch the core being equal to the diameter of said filament.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
US00306872A 1971-11-18 1972-11-15 Transport means for sheets Expired - Lifetime US3791731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5362871A GB1405106A (en) 1971-11-18 1971-11-18 Sheet feed mechanism and electrostatographic copier including same

Publications (1)

Publication Number Publication Date
US3791731A true US3791731A (en) 1974-02-12

Family

ID=10468472

Family Applications (1)

Application Number Title Priority Date Filing Date
US00306872A Expired - Lifetime US3791731A (en) 1971-11-18 1972-11-15 Transport means for sheets

Country Status (9)

Country Link
US (1) US3791731A (xx)
JP (1) JPS4962146A (xx)
CA (1) CA988114A (xx)
DE (1) DE2256553C3 (xx)
DK (1) DK132724C (xx)
FR (1) FR2160600B1 (xx)
GB (1) GB1405106A (xx)
IT (1) IT971040B (xx)
NL (1) NL152993B (xx)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084806A (en) * 1976-11-10 1978-04-18 Eastman Kodak Company Sheet handling apparatus
FR2408165A1 (fr) * 1977-11-07 1979-06-01 Agfa Gevaert Ag Rouleau d'entrainement pour copieur electrostatique
US4227796A (en) * 1979-05-29 1980-10-14 Eastman Kodak Company Electrographic apparatus having improved developer metering construction
US4705266A (en) * 1985-11-22 1987-11-10 Nec Corporation Sheet convey device
US5547449A (en) * 1995-03-14 1996-08-20 Krayenhagen; Dan Flexible roll
US20030143005A1 (en) * 2002-01-31 2003-07-31 Canon Kabushiki Kaisha Transfer material conveying apparatus and image forming apparatus
US20050195259A1 (en) * 2004-03-05 2005-09-08 Brother Kogyo Kabushiki Kaisha Discharge roller, conveyance apparatus, and recording apparatus
US20060182479A1 (en) * 2005-02-14 2006-08-17 Kyocera Mita Corporation Image forming apparatus
US20120132252A1 (en) * 2009-05-26 2012-05-31 Ji Jingjia Transport roller for transporting articles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6344926B2 (ja) * 2014-02-17 2018-06-20 キヤノン株式会社 押圧ローラ、クリーニング装置、および画像加熱装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US623285A (en) * 1899-04-18 The morris peters co
US2894744A (en) * 1956-12-18 1959-07-14 Bruning Charles Co Inc Feed rollers for photo-conductive insulating material
US2901092A (en) * 1953-09-09 1959-08-25 Jonas Woodhead & Sons Ltd Spring rollers or idlers for conveyor belts

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US623285A (en) * 1899-04-18 The morris peters co
US2901092A (en) * 1953-09-09 1959-08-25 Jonas Woodhead & Sons Ltd Spring rollers or idlers for conveyor belts
US2894744A (en) * 1956-12-18 1959-07-14 Bruning Charles Co Inc Feed rollers for photo-conductive insulating material

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4084806A (en) * 1976-11-10 1978-04-18 Eastman Kodak Company Sheet handling apparatus
FR2408165A1 (fr) * 1977-11-07 1979-06-01 Agfa Gevaert Ag Rouleau d'entrainement pour copieur electrostatique
US4227796A (en) * 1979-05-29 1980-10-14 Eastman Kodak Company Electrographic apparatus having improved developer metering construction
US4705266A (en) * 1985-11-22 1987-11-10 Nec Corporation Sheet convey device
US5547449A (en) * 1995-03-14 1996-08-20 Krayenhagen; Dan Flexible roll
US20030143005A1 (en) * 2002-01-31 2003-07-31 Canon Kabushiki Kaisha Transfer material conveying apparatus and image forming apparatus
US7020433B2 (en) * 2002-01-31 2006-03-28 Canon Kabushiki Kaisha Transfer material conveying apparatus and image forming apparatus
US20050195259A1 (en) * 2004-03-05 2005-09-08 Brother Kogyo Kabushiki Kaisha Discharge roller, conveyance apparatus, and recording apparatus
US20060182479A1 (en) * 2005-02-14 2006-08-17 Kyocera Mita Corporation Image forming apparatus
US20120132252A1 (en) * 2009-05-26 2012-05-31 Ji Jingjia Transport roller for transporting articles

Also Published As

Publication number Publication date
DK132724B (da) 1976-01-26
DE2256553C3 (de) 1974-12-05
IT971040B (it) 1974-04-30
NL152993B (nl) 1977-04-15
JPS4962146A (xx) 1974-06-17
DE2256553B2 (xx) 1974-05-02
NL7215575A (xx) 1973-05-22
DK132724C (da) 1976-06-28
CA988114A (en) 1976-04-27
FR2160600A1 (xx) 1973-06-29
FR2160600B1 (xx) 1974-08-19
GB1405106A (en) 1975-09-03
DE2256553A1 (de) 1973-05-24

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