EP0230313A2 - Moyens de guidage de papier dans un appareil de formation d'image - Google Patents

Moyens de guidage de papier dans un appareil de formation d'image Download PDF

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Publication number
EP0230313A2
EP0230313A2 EP87100784A EP87100784A EP0230313A2 EP 0230313 A2 EP0230313 A2 EP 0230313A2 EP 87100784 A EP87100784 A EP 87100784A EP 87100784 A EP87100784 A EP 87100784A EP 0230313 A2 EP0230313 A2 EP 0230313A2
Authority
EP
European Patent Office
Prior art keywords
paper
guide
discharging
roller
forming apparatus
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.)
Withdrawn
Application number
EP87100784A
Other languages
German (de)
English (en)
Other versions
EP0230313A3 (fr
Inventor
Kazumi Iida
Takehiko Okada
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.)
Kyocera Mita Industrial Co Ltd
Original Assignee
Mita Industrial Co 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 Mita Industrial Co Ltd filed Critical Mita Industrial Co Ltd
Publication of EP0230313A2 publication Critical patent/EP0230313A2/fr
Publication of EP0230313A3 publication Critical patent/EP0230313A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2028—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means

Definitions

  • the present invention relates to a paper-discharging apparatus in an image-forming apparatus such as a conying machine and a printer, in particular to a paper guide means in an image-forming apparatus for guiding a recording paper, which was subjected to the thermal fixation, toward a paper-discharging apparatus provided with a plurality of pairs of paper-discharging rollers consisting of an upper paper-discharging roller and a lower paper-discharging roller arranged in an axial direction of said paper-discharging rollers at appointed intervals.
  • a paper guide means for guiding a recording paper toward a paper-discharging apparatus in a copying machine as shown in FIGS. 8, 9 has been proposed.
  • this paper guide means comprises upper guide members 27 and lower guide members 29 in the form of longitudinal rib arranged so as to nosition a guide-finishing end side thereof in the vicinity of a nip portion of an upper paper-discharging roller 25 and a lower paper-discharging roller 26 (a portion where the paper-discharging operation of a recording paper D by both said upper paper-discharging roller 25 and said lower paper-discharging roller 26 is carried out).
  • the paper guide means is constructed in a face-plate shape, water vanour generated from the recording paper D when subjected to the thermal fixation becomes difficult to diffuse and as a result, water vapour is confined in the paper guide means, whereby dewing on a face portion of the face plate-shaped paper guide means in the vicinity of a water vapour source according to circumstances.
  • both said guide members 27 and said guide members 29 are in the form of longitudinal rib, said water vapour can be effectively diffused, whereby leading to such an advantage that a trouble due to the dewing can be prevented.
  • a front end corner portion of the recording paper D extending outwardly from said lower guide member 29 is hung down and the hung down corner portion is engaged with a supporting axis 24 of the lower paper-discharging roller 26 to be apt to be delayed, and as a result, the front end corner portion of the recording paper D is greatly curled downward, so that freauently the curled portion is rolled in the upper paper-discharging roller 25 and the lower paper-discharging roller 26 to produce a so-called corner-bending or the recording paper D, of which front end corner portion is greatly curled, is discharged as it is even though the front end corner portion of the recording paper D is not rolled in the rollers 25, 26.
  • the recording paper D waves greatly up and down in the paper-supply direction until the front end of the recording paper D drawn out from a thermal fixation apparatus 13 is nipped by the paper-discharging rollers 25, 26, and since the recording paper D is cooled until it is nipped by the paper-discharging rollers 25, 26, particularly the front half portion of the recording paper D greatly waves and is discharged as it is according to circumstances.
  • the present invention is characterized by that a lower guide plate provided with a portion, in which the lower paper-discharging roller is to be put, formed therein is arranged so as to dislocate a guide-starting end side of said guide plate in the vicinity of a lower roller for use in the thermal fixation and a guide-finishing end side of said guide plate between a supporting axis of said lower paper-discharging roller and said upper paper-discharging roller, respectively, said guide plate being provided with lower guide members in the form of longitudinal rib standing thereon with intervals in an axial direction of said supporting axis, and upper guide members in the form of longitudinal rib being arranged so as to form a narrow paper guide passage between a lower edge of said upper guide members and an unner edge of said lower guide members as seen from the axial direction of said supporting axis.
  • the paper guide passage defined by the upper guide members and the lower guide members is narrow, even though the recording paper waves in said guide passage, the wave can be reduced to a hardly noticable extent.
  • FIGS. 1 to 5 One preferred embodiment of the present invention is shown in FIGS. 1 to 5, in which
  • FIGS. 6, 7, Another preferred embodiment is shown in FIGS. 6, 7, in which
  • FIGS. 1, 2 show a paper guide means A and FIG. 5 shows an outline of a whole copying machine as an example of an image-forming apparatus.
  • This copying machine comprises a body 3 provided with a manuscript-weight 2 for a contact glass 1 in an unner portion thereof, said body 3 being provided with a photoreceptor 4 laid therein, said photoreceptor 4 being surrounded by an electrifying portion 5, a developing portion 6, a transferring portion 7, a recording paper-separating portion 8 and acleaning portion 9 arranged in this order in the rotating direction R thereof, an optical movable exposing apparatus 10 being provided in a lower space of said contact glass 1, and a paper-transferring apparatus 12 for transferring a recording paper D within a cassette case 11 to said transferring portion 7, a paper-transferring apparatus 14 for transferring the recording paper D separated from the photoreceptor 4 to a thermal fixation apparatus 13, a paper guide means A for guiding the recording paper Dthermally fixed to a paper-discharging
  • Said thermal fixation apparatus 13 comprises a heating roller R 1 and a pressing roller R 2 arranged up and down in the paired form, said heating roller R 1 being formed of a metallic cylindrical roller body 18, of which surface is coated with fluorine resins and the like, provided with a heater 19, such as a heating lamp and a coil, included therein, and said nress- ing roller R 2 being formed of a metallic roller body 20 on which an elastic cylindrical body 21 of large thick made of silicon rubber and the like is nut. Both said heating roller Rl and said pressing roller R 2 are installed on side plates 22, 22.
  • Said paper-discharging apparatus 15 for discharging said recording paper D, which was subjected to the thermal fixation, to said tray 31 comprises a pair of supporting axes 23, 24 consisting of an upper supporting axis 23 and a lower supporting axis 24 rotatably mounted on said side plates 22, 22 so that an axis shaft line thereof may be parallell to axis shaft lines of said rollers R 1 , R 2 for use in the fixation, said upper supporting axis 23 being adapted to be dislocatable up and down along a long hole b formed in said side plates 22, 22, and a plurality of sets (4 sets in this preferred embodiment) of a pair of an upper paper-discharging roller 25 of small width and a lower paper-discharging roller 26 of large width mounted on said supporting axes 23, 24 with appointed intervals in the direction of axis shaft line thereof.
  • two central ones are single-flanged rollers provided with a flange 26B on one side of a roller body 26A while two ones of both sides are double-flanged rollers provided with flanges 26B, 26B on both sides of the roller body 26A so as to bend the recording paper D to be wound in the direction of width, whereby discharging said recording paper under the condition that it is strong-kneed.
  • a peripheral speed of said lower paper-discharging roller 26 is adapted to be slightly larger than that of the thermal fixation roller R 1 . That is to say, for example in a copying machine capable of copying 16 pieces of A4 size copying paper a minute if the peripheral speed of the thermal fixation roller R 1 is 136.2 mm/sec, the peripheral speed of the roller body 26A as shown in FIG. 2 is 136.9 mm (faster than that of the thermal fixation roller R 1 by about 0.5 %) while the peripheral speed of the flange 26B is 148.5 mm/sec (faster than that of the thermal fixation roller R 1 by about 9 %).
  • Said paper guide means A for supplying said paper-discharging apparatus 15 with the recording papaer D, which was subjected to said thermal fixation comprises an upper guide member A 1 and a lower guide member A 2 , said upper guide member A 1 , as shown in FIGS.
  • an upper guide Dart 27 formed of a longitudinal rib-like part formed by downwardly folded both sides of a plate element punched in a H-letter shape by pressing, a lower side edge d of said upper guide part 27 other than a front side edge c of a guide-starting side of said upper guide part 27 rising forward being fixedly mounted on a member 30 extending between said side plates 22, 22 slightly above a line Q linking the nip portions of said rollers Ri, R 2 for use in the thermal fixation and said paper-discharging rollers 25, 26 with each other so that a portion of guide-finishing end side thereof may be overlapped on said upper paper-discharging roller 25.
  • Said lower guide member A 2 comprises a guide plate 28 provided with a portion e, in which said lower paper-discharging roller 26 is to be put, arranged so that a guide-starting end side of said guide plate 28 may be positioned in the vicinity of said lower pressing roller R 2 for use in thermal fixation and the guide-finishing end side of said guide plate 28 may be positioned between said supporting axis 24 of said lower paper-discharging roller 26 and said upper paper-discharging roller 25, said guide plate 28 being provided with longitudinal rib-like lower guide parts 29 standing thereon at appointed intervals in the direction of axis shaft line of said supporting axis 24, in particular said guide plate 28 comprises a main guide surface portion f arranged so as to be greatly separated downward from said line Q at the guide-starting end side thereof and approach to the line Q at the guide-finishing end side thereof, an inclined surface portion g descending forward and connected with the starting end side of said main guide surface portion f under the condition that it is still further separated from the line Q to an extent more than said main
  • said lower guide parts 29 are built on said guide plate 28 so as to position halfway between adjacent upper guide parts 27 .
  • the guide-finishing end side of said lower guide parts 29 being positioned in the vicinity of said lower paper-discharging roller 26, said guide-finishing end side of said lower guide parts 29 being made nearly coincident with said line Q as seen in the direction of axis shaft line of said supporting axis 24, and the guide-starting end side of an upper side edge k other than a front side edge j of the forward descending guide-starting end side being projected slightly above said line Q, whereby the narrow paper-guide passage P is forced between the lower side edge d of said upper guide Darts 27 and the upper side edge k of said lower guide parts 29 so that a forward expanding recording paper-receiving portion B may be formed by said upper front side edge c and said lower front side edge j.
  • l 1 designates a length
  • l 1 designates a length of the upper side edge k projecting upward from said line Q at the guide-starting end side and has a dimension of for example about 2 mm.
  • l 2 designates a width of the smallest portion of said paper guide passage P and has a dimension of for example 1.5 to 2 mm.
  • the recording paper D drawn out from the thermal fixation apparatus 13 is guided by the upper side edge k of the lower guide parts 29 and the lower side edge d of the upper guide parts 27 to be introduced into the narrow paper guide passage P, in which the up and down movement of the recording paper a is restricted, and introduced into the paper-discharging apparatus 15 under the condition that the up and down movement of the recording paper a is restricted, and then discharged onto the paper-discharging tray 31.
  • said main guide surface portion f of the guide plate 28 is adapted to approach to the upper side edge k of the lower guide parts 29 with an approach to the guide-finishing end side, so that at last the front end corner portion of said recording paper D is gradually lifted up to the vicinity of said line Q by said main guide surface portion f to be introduced into the paper-discharging apparatus 15 without being engaged with the lower supporting axis 24 or greatly curling downward (curling downward at both side end portions in the progressive direction of the recording paper D due to the guide plate).
  • the present invention is not limited by the above described preferred embodiment.
  • such constructions as shown in FIGS. 6, 7 may be adopted.
  • each inclined surface portion g is provided with an opening 40 while a pointed end portion thereof is folded to form a vertical plate portion S.
  • a second inclined surface portion m having an inclination larger than that of the inclined surface portion g is connected with the opening 40 so as to turn toward said vertical plate portion S from one edge portion of the opening 40 and a predetermined desired gan l 3 (for example 8 mm) is formed between a nointed end portion m' of the second inclined surface portion m and the lower thermal fixation roller R 2 .
  • a paper guide means in an image-forming apparatus of the present invention since a guide plate, of which guide-starting end side is positioned above a supporting axis of a lower paper-discharging roller, is provided between a thermal fixation apparatus and a paper-discharging apparatus and lower guide parts are installed on said guide plate in a standing manner, the front end corner portion of a recording paper can be surely prevented from being engaged with a supporting axis even if said front end corner portion of the recording paper is projected out of said lower guide parts to be hung down, whereby the front end corner portion of the recording paper can be prevented from being rolled in paper-discharging rollers to be bent at the corner or curled to a great extent.
  • a paper guide passage defined by the upper guide parts and the lower guide Darts is formed so as to be narrow, so that the up and down movement of the recording paper leading to the waving phenomenon of the recording paper can be restricted, whereby reducing the waving of the recording paper to a hardly noticable extent.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Fixing For Electrophotography (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
EP87100784A 1986-01-22 1987-01-21 Moyens de guidage de papier dans un appareil de formation d'image Withdrawn EP0230313A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8300/86U 1986-01-22
JP830086U JPS62120755U (fr) 1986-01-22 1986-01-22

Publications (2)

Publication Number Publication Date
EP0230313A2 true EP0230313A2 (fr) 1987-07-29
EP0230313A3 EP0230313A3 (fr) 1989-05-31

Family

ID=11689299

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100784A Withdrawn EP0230313A3 (fr) 1986-01-22 1987-01-21 Moyens de guidage de papier dans un appareil de formation d'image

Country Status (2)

Country Link
EP (1) EP0230313A3 (fr)
JP (1) JPS62120755U (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19536358A1 (de) * 1995-09-29 1997-04-03 Heidelberger Druckmasch Ag Vorrichtung zum Bogentransport
US8882376B2 (en) * 2005-09-14 2014-11-11 Nec Infrontia Corporation Printer, cut paper discharge mechanism used for printer, and paper jam prevention method
US9158245B2 (en) 2012-01-13 2015-10-13 Oki Data Corporation Medium transporting apparatus and image forming apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2834374B2 (ja) * 1992-10-06 1998-12-09 三田工業株式会社 画像形成装置
JP5067387B2 (ja) * 2009-03-04 2012-11-07 富士ゼロックス株式会社 定着装置及びこれを備えた画像形成装置
JP5740505B2 (ja) * 2014-03-17 2015-06-24 株式会社沖データ 媒体搬送装置および画像形成装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491236A (en) * 1977-12-28 1979-07-19 Konishiroku Photo Ind Co Ltd Guide member of fixing device
EP0059631A2 (fr) * 1981-03-02 1982-09-08 Mita Industrial Co. Ltd. Dispositif pour alimenter et guider des papiers dans une machine à copier
JPS58105251A (ja) * 1981-12-18 1983-06-23 Ricoh Co Ltd シ−ト搬送装置
JPS60142372A (ja) * 1983-12-29 1985-07-27 Ricoh Co Ltd 定着装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5491236A (en) * 1977-12-28 1979-07-19 Konishiroku Photo Ind Co Ltd Guide member of fixing device
EP0059631A2 (fr) * 1981-03-02 1982-09-08 Mita Industrial Co. Ltd. Dispositif pour alimenter et guider des papiers dans une machine à copier
JPS58105251A (ja) * 1981-12-18 1983-06-23 Ricoh Co Ltd シ−ト搬送装置
JPS60142372A (ja) * 1983-12-29 1985-07-27 Ricoh Co Ltd 定着装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 3, no. 113 (E-139), 19th September 1979, page 124 E 139; & JP-A-54-91 236 (KONISHIROKU SHASHIN KOGYO K.K.) 19-07-1979 *
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 210 (P-223)[1355], 16th September 1983; & JP-A-58 105 251 (RICOH K.K.) 23-06-1983 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 312 (P-411)[2035], 7th December 1985; & JP-A-60 142 372 (RICOH K.K.) 27-07-1985 *
XEROX DISCLOSURE JOURNAL, vol. 2, no. 3, May/June 1977, page 95, Stamford, Connecticut, US; S. TSUDA et al.: "Fixing device" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19536358A1 (de) * 1995-09-29 1997-04-03 Heidelberger Druckmasch Ag Vorrichtung zum Bogentransport
US5927709A (en) * 1995-09-29 1999-07-27 Heidelberger Druckmaschinen Ag Device for transporting sheets
US8882376B2 (en) * 2005-09-14 2014-11-11 Nec Infrontia Corporation Printer, cut paper discharge mechanism used for printer, and paper jam prevention method
US9158245B2 (en) 2012-01-13 2015-10-13 Oki Data Corporation Medium transporting apparatus and image forming apparatus
EP2615050B1 (fr) * 2012-01-13 2017-03-29 Oki Data Corporation Appareil de transport de support et appareil de formation d'images

Also Published As

Publication number Publication date
JPS62120755U (fr) 1987-07-31
EP0230313A3 (fr) 1989-05-31

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Inventor name: OKADA, TAKEHIKO