EP0485786A1 - Appareil pour l'alimentation en feuilles - Google Patents

Appareil pour l'alimentation en feuilles Download PDF

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Publication number
EP0485786A1
EP0485786A1 EP91118249A EP91118249A EP0485786A1 EP 0485786 A1 EP0485786 A1 EP 0485786A1 EP 91118249 A EP91118249 A EP 91118249A EP 91118249 A EP91118249 A EP 91118249A EP 0485786 A1 EP0485786 A1 EP 0485786A1
Authority
EP
European Patent Office
Prior art keywords
sheet
feeding
rotary member
regulating
rotary
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.)
Granted
Application number
EP91118249A
Other languages
German (de)
English (en)
Other versions
EP0485786B1 (fr
Inventor
Noriyoshi Ishikawa
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.)
Canon Inc
Original Assignee
Canon 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
Priority claimed from JP2290359A external-priority patent/JP2961866B2/ja
Priority claimed from JP2294821A external-priority patent/JP2845382B2/ja
Application filed by Canon Inc filed Critical Canon Inc
Publication of EP0485786A1 publication Critical patent/EP0485786A1/fr
Application granted granted Critical
Publication of EP0485786B1 publication Critical patent/EP0485786B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H9/00—Registering, e.g. orientating, articles; Devices therefor
    • B65H9/16—Inclined tape, roller, or like article-forwarding side registers
    • B65H9/166—Roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/26—Registering devices
    • B41J13/30—Side lays or gauges

Definitions

  • the present invention relates to a sheet feeding apparatus used with an image forming system such as a copying machine, printer, facsimile, word processor and the like, or other equipments utilizing sheets. More particularly, it relates to a sheet feeding apparatus for feeding a sheet (transfer sheet, photosensitive sheet, electrostatic recording sheet, print sheet, OHP sheet, envelope, post card, sheet original or the like) rested in a sheet containing portion such as a sheet supply cassette one by one to a sheet receiving portion such as an image forming station, exposure station, treating station or the like with a one-side reference.
  • a sheet feeding apparatus for feeding a sheet (transfer sheet, photosensitive sheet, electrostatic recording sheet, print sheet, OHP sheet, envelope, post card, sheet original or the like) rested in a sheet containing portion such as a sheet supply cassette one by one to a sheet receiving portion such as an image forming station, exposure station, treating station or the like with a one-side reference.
  • Figs. 11A, 11B and 11C show laser beam printers having sheet paths, i.e., sheet feeding paths (extending from a sheet containing portion to a sheet ejecting portion) of straight type, U-shaped type and S-shaped type, respectively.
  • the printer having the sheet path of straight or linear type as shown in Fig. 11A has a sheet supply cassette inlet 51 formed in a side surface of a frame 50 of the printer, and a sheet ejection opening 62 formed in the other side surface of the frame.
  • a sheet supply cassette (sheet containing portion) 52 is mounted within the inlet 51, and an ejection tray 63 is mounted within the ejection opening 62 and extends outwardly therefrom.
  • a sheet supply roller 53 is rotated to afford a feeding force to an uppermost sheet (recording medium) P on a sheet stack rested in the sheet supply cassette 52, thereby separating the uppermost sheet from the other sheets with the aid of separating pawls 54 and feeding the sheet into the printer.
  • the fed sheet is conveyed between guide plates 55, 56 and through a path (sheet path) including a pair of regist rollers 57, on image transferring portion 58, a convey belt device 59, an image fixing device 60, ejector rollers 61 and the ejection opening 62, whereby the sheet on which an image was formed (print) is ejected on the ejection tray 63.
  • sheet path including a pair of regist rollers 57, on image transferring portion 58, a convey belt device 59, an image fixing device 60, ejector rollers 61 and the ejection opening 62, whereby the sheet on which an image was formed (print) is ejected on the ejection tray 63.
  • An electrophotographic photosensitive member of drum type (referred to as "photosensitive drum” hereinafter) 64 is driven at a predetermined peripheral speed (process speed) around its own axis in a clockwise direction and is provided at its peripheral surface with a photosensitive body consisting of an organic or inorganic photoconductive layer.
  • the reference numeral 65 denotes a charger for uniformly charging the peripheral surface of the photosensitive drum with the predetermined potential having a predetermined polarity; 66 denotes a beam scanner for scanning and exposing the charged surface of the photosensitive drum to write the aimed information thereon; 66a denotes a beam reflection mirror; 67 denotes a developing device for developing, with toner, an electrostatic latent image formed on the drum surface by the exposure; 68 denotes a transfer roller acting as a transfer means for transferring the toner image on the drum surface to the recording sheet P; and 69 denotes a cleaning device for cleaning the drum surface after the toner image is transferred to the recording sheet.
  • the photosensitive drum 64, charger 65, developing device 67 and cleaning device 69 are constituted as a single removable process cartridge 70.
  • the sheet path extending from the sheet supply cassette 52 to the ejection tray (sheet ejecting portion) 63 is substantially straight, so that the reliability of the sheet feeding operation is increased.
  • the sheet supply cassette 52 and the sheet ejection tray 63 are protruded from both sides of the printer frame outwardly, the installation space for the printer will be greatly increased.
  • the printer having the sheet path of U-shaped type as shown in Fig. 11B has a sheet supply cassette inlet 51 and a sheet ejection opening 62 and is designed so that a sheet supply cassette 52 is wholly inserted into the printer from the inlet 51 and a recording sheet P supplied from the cassette by means of a sheet supply roller 53 is inverted by inversion guides 71a, 71b and convey rollers 72a, 72b to direct the sheet toward a direction opposite to a sheet feeding direction from the cassette 52 above the latter and is fed through a path including an image transferring portion 58, a convey belt device 59, an image fixing device 60, ejector rollers 61 and the ejection opening 62 and then is ejected onto an ejection tray 63.
  • This arrangement since only the ejection tray 63 is protruded from the printer outwardly, the installation space for the printer is reduced in comparison with that for the printer of Fig. 11A.
  • the printer having the sheet path of S-shaped type as shown in Fig. 11C is designed similar to the printer of Fig. 11B, but the sheet ejected from the ejector rollers 61 is inverted again upwardly by an invertion guide 73 to be ejected onto an ejection tray 75 formed on a top plate of the printer by means of second ejector rollers 74.
  • the installation space for the printer is further reduced in comparison with that for the printer of Fig. 11B.
  • the sheet was fed by skew-feed rollers so that one lateral edge of the sheet was guided along a one-side feeding reference formed in an image forming system to prevent the skew-feed of the sheet.
  • the radii of the inversion guides for inverting the sheet are decreased, the skew-feed of the sheet will occur at the first skew-feed roller due to the feeding load in the inversion guide at a side opposite to the feeding reference side, thus damaging the edge of the sheet abutted against the one-side feeding reference.
  • an object of the present invention is to provide a sheet feeding apparatus which can correctly feed a sheet without any skew-feed of the sheet by feeding the sheet while abutting one lateral edge of the sheet against a one-side feeding reference with a simple construction and which can feed the sheet without any skew-feed of the sheet and the damage of a lateral edge of the sheet even when the radius of an inversion path for inverting the sheet is relatively small.
  • Another object of the present invention is to provide a sheet feeding apparatus for an image forming system, which does not generate the excessive tension or slack in a sheet that may worsen the reliability of the feeding of the sheet even when the radius of an inversion path for inverting the sheet is made smaller in order to reduce the height of the image forming system, and which does not bent and/or damage the sheet by a regulating member even when a position of the regulating member on a sheet supply cassette is deviated from a position of a feeding reference guide on the image forming system.
  • Fig. 1 shows, in an elevational section, an example of a laser beam printer (image forming system) incorporating a sheet feeding apparatus according to a preferred embodiment of the present invention
  • Fig. 2 is a perspective view of a sheet inverting portion of the sheet feeding apparatus.
  • Constructural members or elements same as or similar to those of the printer described in connection with Fig. 11 are designated by the same reference numerals, and the detailed explanation thereof will be omitted.
  • a sheet supply cassette 52 comprises a cassette housing 20, an intermediate plate 23 biased upwardly by means of a compression spring 24, sheet separating pawls 54, and a sheet edge regulating member 22 (Fig. 2) for guiding one lateral edge of a recording sheet P.
  • the recording sheets P stacked in the sheet supply cassette 52 are separated by a feeding force directing to the right (Fig. 1) and applied to an uppermost sheet on the sheet stack due to the rotation of a sheet supply roller 53 in such a manner that only the uppermost sheet is separated from the other sheets by means of the separating pawls 54.
  • the separated sheet is fed in the right direction shown by the arrow A. In this case, the recording sheets P are being urged against the sheet supply roller 53 with a predetermined pressure by the action of the intermediate plate 23 and the compression spring 24.
  • the separated sheet P is fed by rightwardly and upwardly along an upper guide 20a of the sheet supply cassette 52 to be entered between a feed roller 27 and a first skew-feed roller (first urging means) 25. Then, the recording sheet P is fed in synchronous with a rotation speed from a drive source (not shown) so that the sheet is advanced along an inversion guide 31 and is passed between the feed roller 27 and a second skew-feed roller (second urging means) 26. As a result, the sheet P is inverted to be fed in a direction B opposite to the feeding direction A from the cassette 52.
  • the inverted recording sheet P is then passed through a path including a guide plate 32, an image transferring portion 58, a guide plate 75, an image fixing device 60, ejector rollers 61 and a sheet ejection opening 62, and is lastly ejected onto an ejection tray 63 disposed at the left side of a frame 50 of the system.
  • the transferring of a toner image from a surface of a photosensitive drum 64 to the recording sheet P can be effected by the fact that a back surface of the recording sheet P is charged by means of a transfer roller 68 with a charge polarity opposite to that of the toner image. And, the recording sheet P passed through the image transferring portion 58 is separated from the surface of the photosensitive drum 64 by removing the charge from the sheet by means of a separating and discharging probe 9.
  • the reference numeral 33 denotes a one-side feeding reference guide for the recording sheet P supplied from the sheet supply cassette 52, which reference guide is provided on the image forming system.
  • the feed roller 27 is disposed adjacent to the one-side feeding reference guide.
  • the excessive skew-feeding force is not applied to the recording sheet P.
  • the recording sheet P is stably skew-fed while maintaining the uniform abutment between the sheet and the reference guide, by the combination of the skew-feeding force FS1 of the first skew-feed roller 25 and the skew-feeding force FS2 of the second skew-feed roller 26.
  • ⁇ , ⁇ ' indicate amounts of the delay in the feeding of the sheet P at a non-reference side with respect to the reference side, which are generated by the feeding loads FH, FH' due to the invertion guide 31.
  • the skew-feeding angle ⁇ 1 of the first skew-feed roller 25 may fall within a range between 0° to 4°
  • the skew-feeding angle of the second skew-feed roller 26 may fall within a range between 0° to 10°.
  • the skew-feed rollers 25, 26 acting as the urging means are not limited to two in number, but three or more skew-feed rollers may be used. Further, the sheet feeding force may be applied to the skew-feed rollers 25, 26, rather than the feed roller 27.
  • a feed roller 27A or skew-feed rollers 25A, 26A having spiral grooves S at its peripheral surface may be used to skew-feed the sheet toward the one-side feeding reference guide.
  • the separating pawls were used to separate the sheet one by one, other sheet separating means may be used.
  • the sheet containing portion is not limited to the sheet supply cassette, but may comprise a sheet supply deck, manual sheet supply platform or tray.
  • the sheet may be proposed by sequentially cutting a sheet having a required length from a sheet roll.
  • Fig. 7 shows an electrophotographic laser beam printer (LBP) incorporating a sheet feeding apparatus according to another embodiment of the present invention therein.
  • LBP electrophotographic laser beam printer
  • an electrophotographic photosensitive member of drum type (referred to as "photosensitive drum” hereinafter) 101 is housed in a process cartridge 102 and is driven at a predetermined peripheral speed around its own axis 101a, and is provided at its peripheral surface with a photosensitive body consisting of an organic or inorganic photo-conductive layer.
  • the photosensitive drum 101 During the rotation of the photosensitive drum 101, it is uniformly charged with a predetermined positive or negative potential by means of a primary charger (not shown) disposed in the process cartridge 102, and then, the aimed image information is written on the photosensitive drum at an exposure portion 103 by a scanning and exposure laser beam L from a laser scanner 105. As a result, electrostatic latent images corresponding to the aimed image information are sequentially formed on the peripheral surface of the photosensitive drum 101.
  • the reference numeral 106 denotes a reflection mirror for deflecting the laser beam L emitted from the laser scanner 105 toward the exposure portion 103 on the photosensitive drum 101.
  • the latent image carried on the photosensitive drum is then visualized with visualizing agent (toner) by means of a developing device (not shown) disposed in the process cartridge 102 to obtain a toner image.
  • visualizing agent toner
  • a developing device not shown
  • the toner images on the photosensitive drum sequentially reach a transfer station including a transfer roller 107
  • the toner images are sequentially transferred onto a transfer sheet (recording medium) P fed between the transfer roller 107 and the photosensitive drum 101 by means of a sheet supply mechanism 108.
  • the transferring of each toner image on the photosensitive drum to the transfer sheet P is effected by charging the sheet with the charge polarity opposite to that of the toner image by means of the transfer roller 107 disposed at a back side of the transfer sheet P.
  • the transfer sheet P is separated from the photosensitive drum by removing the charge from the sheet by means of a separating and discharging probe 109 charged with the charge polarity opposite to that of the transfer roller 107.
  • the separated transfer sheet is then sent to a fixing device 110, where a non-fixed toner image transferred to the transfer sheet P is permanently fixed to the sheet.
  • the transfer sheet P on which the image was fixed is fed by a pair of ejector rollers 111 and is ejected onto an ejection tray 112.
  • the photosensitive drum is cleaned by a cleaning device (not shown) disposed in the process cartridge 102 to remove the residual toner from the surface of the drum, thus preparing for the next image formation.
  • Recording sheets P stacked in a sheet supply cassette 113 which is removably mounted within an image forming system are separated by a feeding force applied to an uppermost sheet on the sheet stack due to the rotation of a sheet supply roller 115 in such a manner that only the uppermost sheet is separated from the other sheets by means of the separating pawls 116.
  • the separated sheet is fed in the right direction shown by the arrow a.
  • the recording sheets P are being urged against the sheet supply roller 115 with a predetermined pressure by the action of an intermediate plate 117 and a compression spring 119.
  • the separated sheet P is fed by rightwardly and upwardly along an arcuted guide 113a of the sheet supply cassette 113 to be entered between a feed roller 121 and a first skew-feed roller 120. Then, the recording sheet P is fed in synchronous with a rotation speed from a drive source (not shown) so that the sheet is passed between the feed roller 121 and a second skew-feed roller 122 to reach an image forming portion between the photosensitive drum 101 and the transfer roller 107.
  • a drive source not shown
  • the recording sheet P can be prevented from being bent or scratched, because, as shown in Fig. 10, even if the recording sheet P is pinched and caught between the first skew-feed roller 120 and the feed roller 121 at a position P1, since the recording sheet P has a radius R of curvature, it is possible to absorb the clearance ⁇ 3 by this radius R, thus reducing a force F of the regulating member 132 of the sheet supply cassette 113 acting on the lateral edge of the recording sheet P.
  • the resiliency of the recording sheet P will be stronger and the force F will be increased sufficient to damage the rateral edge of the recording sheet P, thus bending or folding and/or scratching the sheet.
  • the feeding reference guide 125 of the printer frame 123 and the edge regulating member 132 of the sheet supply cassette 113 have no positional relation as shown in Fig. 12B, the corner of the recording sheet P is not bent or folded at the position C (Fig. 12B). Further, since the inversion of the recording sheet P is effected on the peripheral surface of the single feed roller 121, during the inversion of the sheet, the feeding speed of the sheet is constant. Thus, there is no tension and slack in the recording sheet P.
  • separating pawls were used as the separating means, it should be noted that other separating means may be used.
  • the skew-feed rollers 120, 122 are used as the urging means for skew-feeding the recording sheet P, these skew-feed rollers may be provided at their peripheral surfaces with spiral grooves S as shown in Fig. 6. Such spiral grooves may be provided on the feed roller 121.
  • the skew-feed rollers 120, 122 acting as the urging means are not limited to two in number.
  • the feeding force for the recording sheet P may be applied to the skew-feed rollers 120, 122, rather than the feed roller 121.
  • the clearance ⁇ 3 between the feeding reference guide 125 of the printer frame 113 and the edge regulating member 132 of the sheet supply cassette 113 was set to have a value of 1.5 mm, for example, even when the clearance is set to have a value of 0 to 8 mm, it was found that the sheet can be properly fed without bending and scratching the sheet P.
  • a sheet feeding apparatus comprising a feeding means for feeding a sheet, a regulating member for regulating a position of a lateral edge of the sheet fed by the feeding means, a first rotary member adapted to feed the sheet fed by the feeding means while urging the lateral edge of the sheet against the regulating member, a second rotary member adapted to feed the sheet fed by the first rotary member while urging the lateral edge of the sheet against the regulating member, and a guide means for guiding the sheet in such a manner that the sheet is curved between the feeding means and the first rotary member.
  • An urging force of the first rotary member by which the sheet is urged against the regulating member is set to be equal to or smaller than an urging force of the second rotary member by which the sheet is urged against the regulating member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP19910118249 1990-10-26 1991-10-25 Appareil pour l'alimentation en feuilles Expired - Lifetime EP0485786B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP290359/90 1990-10-26
JP2290359A JP2961866B2 (ja) 1990-10-26 1990-10-26 シート材搬送装置及び画像形成装置
JP294821/90 1990-10-31
JP2294821A JP2845382B2 (ja) 1990-10-31 1990-10-31 画像形成装置の給紙搬送装置

Publications (2)

Publication Number Publication Date
EP0485786A1 true EP0485786A1 (fr) 1992-05-20
EP0485786B1 EP0485786B1 (fr) 1997-05-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910118249 Expired - Lifetime EP0485786B1 (fr) 1990-10-26 1991-10-25 Appareil pour l'alimentation en feuilles

Country Status (2)

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EP (1) EP0485786B1 (fr)
DE (1) DE69126276T2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0703174A1 (fr) * 1994-09-21 1996-03-27 Lexmark International, Inc. Appareil pour alimentation en feuilles
EP0855284A1 (fr) * 1996-11-28 1998-07-29 Agfa-Gevaert N.V. Imprimante thermique avec moyens d'alimentation en feuilles
US5860781A (en) * 1994-01-24 1999-01-19 Oce Printing Systems Gmbh Document printing apparatus and method
US5967681A (en) * 1996-11-28 1999-10-19 Agfa-Gevaert Thermal printer with sheet feeding means
GB2404170A (en) * 2003-07-22 2005-01-26 Hewlett Packard Development Co Media registration mechanism for image forming device
DE10162538B4 (de) * 2000-12-19 2006-09-21 Hewlett-Packard Development Co., L.P., Houston Papierantriebs-Blattzuführsystem für einen Farbdrucker und Verfahren zum Ausrichten und Positionieren eines Druckmediumblattes in einem Farbdrucker
CN103434825A (zh) * 2013-08-01 2013-12-11 黄平 一种可调节转速的压轮组件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708157A (en) * 1925-03-27 1929-04-09 Spiess Georg Apparatus for feeding folded or unfolded sheets to printing, folding, or other machines
US4432541A (en) * 1981-08-27 1984-02-21 International Business Machines Corporation Recirculating document feed apparatus and method for aligning documents therein
EP0127479A1 (fr) * 1983-05-31 1984-12-05 Rediffusion Computers Limited Dispositif de transport pour documents
EP0184263A1 (fr) * 1984-12-07 1986-06-11 Koninklijke Philips Electronics N.V. Dispositif pour le transport d'une bande souple

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1708157A (en) * 1925-03-27 1929-04-09 Spiess Georg Apparatus for feeding folded or unfolded sheets to printing, folding, or other machines
US4432541A (en) * 1981-08-27 1984-02-21 International Business Machines Corporation Recirculating document feed apparatus and method for aligning documents therein
EP0127479A1 (fr) * 1983-05-31 1984-12-05 Rediffusion Computers Limited Dispositif de transport pour documents
EP0184263A1 (fr) * 1984-12-07 1986-06-11 Koninklijke Philips Electronics N.V. Dispositif pour le transport d'une bande souple

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5860781A (en) * 1994-01-24 1999-01-19 Oce Printing Systems Gmbh Document printing apparatus and method
EP0703174A1 (fr) * 1994-09-21 1996-03-27 Lexmark International, Inc. Appareil pour alimentation en feuilles
EP0855284A1 (fr) * 1996-11-28 1998-07-29 Agfa-Gevaert N.V. Imprimante thermique avec moyens d'alimentation en feuilles
US5967681A (en) * 1996-11-28 1999-10-19 Agfa-Gevaert Thermal printer with sheet feeding means
DE10162538B4 (de) * 2000-12-19 2006-09-21 Hewlett-Packard Development Co., L.P., Houston Papierantriebs-Blattzuführsystem für einen Farbdrucker und Verfahren zum Ausrichten und Positionieren eines Druckmediumblattes in einem Farbdrucker
GB2404170A (en) * 2003-07-22 2005-01-26 Hewlett Packard Development Co Media registration mechanism for image forming device
US6971647B2 (en) 2003-07-22 2005-12-06 Hewlett-Packard Development Company, L.P. Media registration mechanism for image forming device
GB2404170B (en) * 2003-07-22 2006-09-20 Hewlett Packard Development Co Media registration mechanism for image forming device
CN103434825A (zh) * 2013-08-01 2013-12-11 黄平 一种可调节转速的压轮组件

Also Published As

Publication number Publication date
DE69126276T2 (de) 1997-11-13
DE69126276D1 (de) 1997-07-03
EP0485786B1 (fr) 1997-05-28

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