US3495821A - Transport device and method - Google Patents

Transport device and method Download PDF

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Publication number
US3495821A
US3495821A US728108A US3495821DA US3495821A US 3495821 A US3495821 A US 3495821A US 728108 A US728108 A US 728108A US 3495821D A US3495821D A US 3495821DA US 3495821 A US3495821 A US 3495821A
Authority
US
United States
Prior art keywords
rollers
sheet
image
transport device
fusing
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
US728108A
Other languages
English (en)
Inventor
Donald E Raterman
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.)
AB Dick Co
Original Assignee
Multigraphics Inc
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 Multigraphics Inc filed Critical Multigraphics Inc
Application granted granted Critical
Publication of US3495821A publication Critical patent/US3495821A/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
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/6573—Feeding path after the fixing point and up to the discharge tray or the finisher, e.g. special treatment of copy material to compensate for effects from the fixing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00417—Post-fixing device
    • G03G2215/00421—Discharging tray, e.g. devices stabilising the quality of the copy medium, postfixing-treatment, inverting, sorting
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00679—Conveying means details, e.g. roller

Definitions

  • This invention relates to the delivery of copies, especially from electrostatic copying machines, and is addressed to the problem of tracking which sometimes arises when the thermoplastic resinous image is not fully set as the sheet encounters the pull-out rollers which take it from the usual fixing station and place it in the receiver. If the image is still soft or semi-liquid, a portion of the image material may be picked up on the surface of the feed-out rollers and transferred therefrom to background portions of the same sheet or other sheets where no image is desired.
  • the problem is associated with the speed of machine operation.
  • the fusing can be accomplished at lower heat levels since the thermoplastic resinous material comprising the image is permitted a longer time in the heating station to come up to its fusing temperature.
  • the temperature of the heating station must be increased in order to compensate for the decreased time the copy sheet spends under the influence of heat.
  • the image tends to remain in a softened condition after it leaves the fusing station at the time the rollers move into contact with the image so that offset will occur.
  • the speed and output of the machine need not be limited in this respect and substantial increases could, in many cases, be effected.
  • the image sheet has been fed from the fixing station by means of lightly contacting, relatively impositive feed rollers wherein non-opposed frictional tire portions arranged in staggered relationship deflect the sheet in a slightly wavy configuration, and thereby use the resilience of the sheet to maintain a delicate driving contact with the tires.
  • This arrangement has proved quite satisfactory, but, as the speed of the equipment is increased and also the heat levels, it has been found that even this light contact is sufiicient to cause some track ing because of the softer condition of the image when it reaches the rollers and the higher temperature of the rollers.
  • rollers could engage the sheet in a more positive manner to insure a uniform motion through and out of the fixing section of the copier. This is especially the case where heat fusing is used and where, if the sheet overstays its time in the fixer, there is a possibility of charting.
  • the pull-out rollers are arranged to engage the sheet in a light pressure nip to provide a rather positive feed, and the roller or rollers engaging that surface of the sheet which carries the image are of a porous character and impregnated with silicone oil. It has been found that virtually no image material is picked up by the impregnated rollers, although the image may still be soft and tacky when it encounters them, and consequently the speed of operation of the whole machine can be substantially increased.
  • FIGURE 1 is a diagrammatic side elevation of a portion of an electrostatic copier illustrating the invention
  • FIGURE 2 is an elevation to a larger scale of the pull-out rollers taken substantially on line 2-2 of FIGURE 1;
  • FIGURE 3 is an enlarged detail perspective illustrating the improved roller of the present invention.
  • the fusing section of the copying machine is indicated at 11, and includes a heating element 13 energized by a source 15 of electrical energy, a reflector 17, and a conveyor 19 upon which the sheets of paper S are carried past the heating apparatus, image face up.
  • the pull-out roller assembly is designated 21 and comprises a pair of fixed side members 23, 23 which provide rotatable mounting for a lower roller 25, and an upper roller 27, the latter made up of a shaft 29 carrying two sheet contact cylinders 31.
  • the cylinders 31 are arranged for light contact with the surface of roller 25 and form therewith a nip to receive and positively move forward a sheet introduced between them.
  • Suitable means (not shown) of a conventional nature are provided for driving the rollers 23 and 25 at the surface speed of sheets S as they issue from the fuser section 11.
  • the rollers 25 and 27 cooperate to forward the sheets S in turn to the receiver 33.
  • the cylinders 31 are of porous material of any of various sorts. Materials which are substantially rigid have been found to be most suitable for the present application. One which has been found particularly useful is powdered bronze, sintered and compressed to form a porous metal body similar to that used in the manufacture of self-lubricating bearings. It will be understood, however, that any porous body of suitable metallic or plastic material can be used for this purpose.
  • the porous body is then impregnated with a liquid that prevents the adhesion of the softened resin to the surface of the cylinder.
  • the liquid in the cylinder comes to the Feb. 17, 1970 D. E. RATERMAN 3,495,821

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Fixing For Electrophotography (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Paper Feeding For Electrophotography (AREA)
US728108A 1968-05-10 1968-05-10 Transport device and method Expired - Lifetime US3495821A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US72810868A 1968-05-10 1968-05-10

Publications (1)

Publication Number Publication Date
US3495821A true US3495821A (en) 1970-02-17

Family

ID=24925449

Family Applications (1)

Application Number Title Priority Date Filing Date
US728108A Expired - Lifetime US3495821A (en) 1968-05-10 1968-05-10 Transport device and method

Country Status (4)

Country Link
US (1) US3495821A (enrdf_load_stackoverflow)
BE (1) BE732434A (enrdf_load_stackoverflow)
DE (1) DE1923869C3 (enrdf_load_stackoverflow)
GB (1) GB1257498A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690646A (en) * 1970-07-08 1972-09-12 Addressograph Multigraph Electrostatic conveyor
DE2612530A1 (de) * 1975-04-24 1976-11-04 Xerox Corp Vorrichtung zum zufuehren von dokumenten
US5040781A (en) * 1988-05-12 1991-08-20 Canon Kabushiki Kaisha Sheet member feeding apparatus having cut-outs to protect document tips

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59124648A (ja) * 1982-12-29 1984-07-18 Fuji Photo Film Co Ltd シ−ト集積用ニツプロ−ル

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690646A (en) * 1970-07-08 1972-09-12 Addressograph Multigraph Electrostatic conveyor
DE2612530A1 (de) * 1975-04-24 1976-11-04 Xerox Corp Vorrichtung zum zufuehren von dokumenten
US5040781A (en) * 1988-05-12 1991-08-20 Canon Kabushiki Kaisha Sheet member feeding apparatus having cut-outs to protect document tips

Also Published As

Publication number Publication date
BE732434A (enrdf_load_stackoverflow) 1969-10-16
DE1923869A1 (de) 1969-11-27
GB1257498A (enrdf_load_stackoverflow) 1971-12-22
DE1923869C3 (de) 1975-10-02
DE1923869B2 (de) 1975-02-27

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