EP0740218B1 - Zuführvorrichtung für einen Aufzeichnungsträger - Google Patents

Zuführvorrichtung für einen Aufzeichnungsträger Download PDF

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Publication number
EP0740218B1
EP0740218B1 EP96106679A EP96106679A EP0740218B1 EP 0740218 B1 EP0740218 B1 EP 0740218B1 EP 96106679 A EP96106679 A EP 96106679A EP 96106679 A EP96106679 A EP 96106679A EP 0740218 B1 EP0740218 B1 EP 0740218B1
Authority
EP
European Patent Office
Prior art keywords
recording medium
passage
curved
central region
ribs
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
EP96106679A
Other languages
English (en)
French (fr)
Other versions
EP0740218A1 (de
Inventor
Takeshi Kadono
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.)
Toshiba TEC Corp
Original Assignee
Toshiba TEC Corp
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 Toshiba TEC Corp filed Critical Toshiba TEC Corp
Publication of EP0740218A1 publication Critical patent/EP0740218A1/de
Application granted granted Critical
Publication of EP0740218B1 publication Critical patent/EP0740218B1/de
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
    • 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
    • G03G15/6558—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point
    • G03G15/6567—Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point for deskewing or aligning
    • 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"
    • G03G2215/00405—Registration device

Definitions

  • the present invention relates to an apparatus for supplying a sheet-like recording medium to a register unit.
  • the above described apparatus is used for supplying a recording medium such as a sheet having a predetermined size to a register unit arranged in front of a printing unit in a copying machine or facsimile apparatus.
  • a recording medium such as a sheet having a predetermined size
  • a register unit arranged in front of a printing unit in a copying machine or facsimile apparatus.
  • Such an apparatus is known from EP-A-0 579 168.
  • FIG. 6 schematically shows a structure of the conventional apparatus of the above described kind.
  • the conventional apparatus comprises a recording medium sending-out unit 10 for sending out a paper sheet P, and a recording medium transfer guide unit 16 for guiding the sheet P sent out from the sending-out unit 10 to a register unit 14 arranged in front of a printing unit 12.
  • the register unit 14 is structured by a pair of regist rollers.
  • the recording medium sending-out unit 10 comprises a recording medium cassette 10a containing a plurality of sheets P in a stacked state, a pickup roller 10b contacting a periphery of an uppermost sheet P in the plurality of the sheets in the cassette 10a at a position near an inlet opening of the recording medium transfer guide unit 16 and selectively moving the uppermost sheet P toward the inlet opening, and a sending-out roller 10c for sending out the uppermost sheet P moved toward the inlet by the pickup roller 10b, into the recording medium transfer guide unit 16 through the inlet opening.
  • the recording medium transfer guide unit 16 includes a pair of guide members 16a and 16b which face each other with a gap much larger than the thickness of the sheet P.
  • the guide member 16a has a portion constantly and slidingly contacting the sheet P to guide the transfer of the sheet P.
  • a sliding contact surface of the portion of the guide member 16a has a comb-teeth like cross section as shown in FIG. 7 in order to reduce a sliding friction generating between the sliding contact surface and the sheet P.
  • Projecting end surfaces of ribs 18, the ribs 18 structuring the sliding contact surface of the comb-teeth like cross section of the guide member 16a, are placed on the same plane so that all of the projecting end surfaces of the ribs 18 covered by the sheet P slidingly contacting the sliding contact surface of the guide member 16a contact the sheet P.
  • the register unit 14 is arranged near an outlet of the recording medium transfer guide unit 16, and a length of a sheet transferring passage from the sending-out roller 10c to the register unit 14 via the recording medium transfer guide unit 16 is shorter than a length of the sheet P measured in its moving direction.
  • the sheet P discharged from the outlet of the recording medium transfer guide unit 16 abuts its leading end on a contact line of the regist roller pair of the register unit 14. If the sheet P skews in this time with regard to the contact line as shown in FIG. 8, a moment M will be produced in the sheet P which is applied with a moving force F by the sending-out roller 10c, to turn the sheet P around at one corner L of the leading end contacting the contact line and to move another corner R of the leading end not contacting the contact line toward the contact line.
  • the register unit 14 is driven to send out the sheet P toward the printing unit 12 after a sufficient time for correcting the skew of the sheet P has passed from a time when the sheet P is send out from the cassette 10a.
  • the printing unit 12 prints an image on the sheet P reached thereto on the basis of printing information supplied to the printing unit 12 in advance.
  • the sheet P is still applied with the moving force F by the sending-out roller 10c, and thus the sheet P is bent due to the moving force F.
  • the bend may easily occur, particularly in a portion at which the moving direction of the sheet P is changed in the sheet transferring passage in the recording medium transfer guide unit 16, i.e., in a bending portion of the transfer guide unit 16.
  • a peak of the bend is pushed against the projecting end surfaces of the ribs 18 of the guide member 16a.
  • the bend of the sheet P is shown in FIG. 6 by a dotted line.
  • the friction produced between the sheet P and each of the projecting end surfaces of the ribs 18 is equal to each other. Therefore, if the sheet P skews, a turn of the sheet P for correcting the skew of the sheet P cannot be easily generated because the peak of the bend is pushed against the projecting end surfaces of the ribs 18 of the guide member 16a.
  • the sheet P may be supplied to the printing unit 12 without the skew of the sheet P being corrected by the register unit 14, so that an image may be printed on the sheet P in a wrong position, or wrinkles may be generated in the sheet P, which may clog the sheet transferring passage.
  • This invention is derived from the above described circumstances, and the object of the present invention is to provide a recording medium supplying apparatus which can always surely correct a skew of a recording medium by a register unit, and can always surely prevent a decrease in printing quality on the recording medium, generation of wrinkles in the recording medium, and clogging of the recording media in a recording medium transferring passage.
  • any recording medium skewing will not be supplied by the register unit to the recording unit such as a printing unit.
  • the recording unit such as a printing unit.
  • information can be precisely recorded on the recording medium.
  • the recording medium will not be wrinkled, and thus clogging of the recording medium in the recording medium transferring passage will not occur.
  • the section of the recording medium contact portion of the recording medium transfer guide unit is structured by a plurality of ribs protruding toward the recording medium and extending in the recording medium moving direction at a plurality of positions spaced apart from each other in the direction crossing the moving direction of the recording medium.
  • the recording medium contact portion of the recording medium transfer guide unit structured as above further decreases the frictional force generated between it and the recording medium slidingly contacting thereon.
  • the ribs arranged on each side of the central region of the recording medium contact portion in the crossing direction are so structured that the height of the side arranged ribs decrease as positions of the side arranged ribs are farther away from the central region.
  • the ribs arranged on each side of the central region have the same height less that in the central region.
  • a recording medium supplying apparatus will be described in detail with reference to FIGS. 1 to 4.
  • Most of components of the apparatus of the present invention are the same as those of the conventional apparatus described above with reference to FIGS. 6 to 8. Therefore, the same or like components in the apparatus according to one embodiment of the present invention as those in the above described conventional apparatus are designated by the same reference numerals as those used to designate the corresponding components in the conventional apparatus, and the detailed description of the same or like components of the apparatus of the one embodiment of the present invention are omitted.
  • the recording medium supplying apparatus differs from the above described conventional apparatus in a shape of a cross section of a portion of one guide member 16a' of a recording medium transfer guide unit 16'.
  • the portion is a portion of the one guide member 16a' against which a peak of a bend of a recording medium P is pushed when a leading end of the recording medium P contacts a contact line of a regist roller pair of a register unit 14, moving of the recording medium P by a sending-out roller 10c is stopped, and the recording medium P is bent as shown by a dotted line in FIG. 1.
  • the bend may easily occur particularly in a portion at which the moving direction of the recording medium P is changed, of a recording medium moving passage in the recording medium transfer guide unit 16', i.e., in a bending portion.
  • the recording medium P is a paper sheet as in the above described conventional apparatus.
  • the entire of a sliding contact surface of the one guide member 16a' which faces another guide member 16b' of the recording medium transfer guide unit 16' is structured by projecting end surfaces of a plurality of ribs 18', the ribs being spaced apart from each other at substantially the same intervals in a direction along with the contact surface of the one guide member 16a' and perpendicular to the moving direction of the sheet P in the recording medium transfer guide unit 16', and extending in the moving direction of the sheet P, as shown in FIG. 2.
  • the present invention is characterized in that a cross section of the one portion (bending portion) of the one guide member 16a' is formed such that one rib 18' arranged in the central region in the direction along with the contact surface the one guide member 16a' and perpendicular to the moving direction of the sheet P protrudes higher than the other ribs 18' arranged on the both sides of the central region.
  • the ribs 18' arranged on each of the both sides of the central region can be formed such that the heights of the ribs arranged on each of the both sides of the central region decrease stepwisely as the positions of the ribs being farther away from the central region. That is, in the cross section of FIG.
  • a cross section of the other portion (a vertically raising portion extending from an inlet of the recording medium transfer guide unit 16' adjacent to a sending-out roller 10c to the bending portion, and a horizontal portion extending from the bending portion to an outlet of the transfer guide unit 16' adjacent to the regist roller pair of the register unit 14) of the guide member 16a' is formed similarly to that of the conventional apparatus.
  • projecting end surfaces of the plurality of ribs 18' structuring the sliding contact surface of the other portion of the guide member 16a' are arranged in the same plane so that all of the projecting end surfaces of the plurality of ribs 18' covered by the sheet P slidingly contacting the sliding contact surface of the other portion can slidingly contact the sheet P to make the sheet P move stably in the other portion.
  • the sheet P is bent as shown in FIG. 1 by a dotted line, and a peak of the bend is pushed against the sliding contact surface of the bending portion of the one guiding member 16a' of the recording medium transfer guide unit 16'.
  • the peak of the bend contacts only the projecting end surface of the rib 18' arranged in the central region in the direction along with the sliding contact surface and perpendicular to the moving direction of the sheet P, and does not contact the projecting end surfaces of the ribs 18' on the both sides of the central region.
  • a friction F2 which is generated between the projecting end surfaces of the ribs 18' arranged on the both sides of the central region and the both sides of a central region of the sheet P in its width direction corresponding to the projecting end surfaces of the ribs 18' on the both sides, is quite smaller than a friction F1 which is generated between the projecting end surface of the rib 18' arranged in the central region and the central region of the sheet P in its width direction corresponding to the projecting end surface of the rib 18' arranged in the central region.
  • the sheet P when the sheet P skews, the sheet P can be easily turned to correct the skew of the sheet P while the peak of the bend of the sheet P is pushed only against the projecting end surface of the rib 18' arranged in the central region of the plurality of ribs 18' of the one guide member 16a' of the recording medium transfer guide unit 16' in the direction along the sliding contact surface and perpendicular to the moving direction of the sheet P.
  • the sheet P is supplied by the register unit 14 to the printing unit 12 after the skew of the sheet P has been surely corrected. Therefore, the shift of the image on the sheet P will not occur, the sheet P will not be wrinkled, and clogging of the sheet P in the recording medium moving passage of the recording medium transfer guide unit 16' will not occur.
  • FIG. 5 is a sectional view showing a main portion of a modification of the recording medium supplying apparatus according to the one embodiment of the present invention, taken along the same line indicated in FIG. 3.
  • the cross section of the portion (the bending portion) of the one guide member 16a' of the recording medium transfer guide unit 16' is formed as shown in FIG. 5 such that the plurality of ribs 18' arranged on the both sides of the central region in the direction along the sliding contact surface and perpendicular to the moving direction of the sheet P have the same height less than that of the rib 18' in the central region.
  • the rib 18' arranged in the central region can protrude than the ribs 18' on the both sides of the central region.
  • the ribs 18' may be formed such that the heights of the ribs 18' arranged on the both sides of the central region decrease as the position of the rib 18' is farther away from the central region in unit of two or three ribs 18', and that the ribs 18' arranged on both sides of the central region may have various height different from each other.
  • the modification structured in this manner can perform the same operation and can attain the same advantage as those of the recording medium supplying apparatus according to the aforementioned one embodiment and described above with reference to FIGS. 1 to 4.
  • the number of the rib 18' arranged in the central region is determined as one, but it can be increased as long as the turning of the sheet P for correcting the skew can be easily performed.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Paper Feeding For Electrophotography (AREA)
  • Registering Or Overturning Sheets (AREA)

Claims (3)

  1. Zuführvorrichtung für ein Aufzeichnungsmedium und zum Verhindern des Schieflaufs eines Aufzeichnungsmediums (P), wenn das Medium einer Druckeinheit zugeführt wird, wobei die Vorrichtung umfaßt:
    eine Aufzeichnungsmedium-Aussendeeinheit (10) zum Aussenden eines Aufzeichnungsmediums (P);
    eine Aufzeichnungsmedium-Übertragungs-Führungseinrichtung (16') zum Führen einer Bewegung des Aufzeichnungsmediums (P), das von der Aufzeichnungsmedium-Aussendeeinheit (10) ausgesendet wird, wobei die Aufzeichnungsmedium-Übertragungs-Führungseinheit (16') einen geraden Teil mit einem geraden Durchgang und einen gebogenen Teil mit einem gebogenen Durchgang besitzt, ein erstes Ende der geraden Durchführung mit der Aufzeichnungsmedium-Aussendeeinheit (10) verbunden ist, und ein zweites Ende der geraden Durchführung mit einem ersten Ende der gebogenen Durchführung verbunden ist, der gebogene Teil mit einem Winkel von nicht weniger als 90° in bezug auf den geraden Teil gebogen ist, der gebogene Teil eine nach innen eingezogene gebogene Oberfläche und eine nach außen vorstehende gebogene Oberfläche gegenüber der nach innen eingezogenen gebogenen Oberfläche besitzt, um die gebogene Durchführung zu bilden, wobei die nach innen eingezogene gebogene Oberfläche so angeordnet ist, daß das Aufzeichnungsmedium, das durch die Aufzeichnungsmedium-Aussendeeinheit ausgesendet und durch die gerade Durchführung übertragen wird, sich gleitend in Kontakt mit der nach innen eingezogenen gebogenen Oberfläche befindet, so daß eine Übertragungsrichtung des Aufzeichnungsmediums geändert wird, wobei die nach innen eingezogene gebogene Oberfläche mehrere Rippen (18') aufweist, die in einer Richtung quer zu der Übertragungsrichtung des Aufzeichnungsmediums in der gebogenen Durchführung beabstandet sind und sich in Übertragungsrichtung erstrecken, wobei die nach innen eingezogene gebogene Oberfläche einen Querschnitt besitzt, der sich in Querrichtung erstreckt und einen Zentralbereich und zwei Seitenbereiche besitzt, die auf entsprechenden Seiten des Zentralbereiches in Querrichtung angeordnet sind, wobei die gerade Durchführung und die gebogene Durchführung eine Gesamt-Durchführungslänge definieren, die kürzer als eine Länge des Papierblattes in der Übertragungsrichtung des Aufzeichnungsmediums ist; und
    eine Registereinheit (14), die mit einem zweiten Ende der gebogenen Durchführung verbunden ist und mit der sich ein Vorderende des Aufzeichnungsmediums, das von dem zweiten Ende der gebogenen Durchführung abgegeben wird, in Kontakt befindet;
       dadurch gekennzeichnet, daß wenigstens eine Rippe (18') in dem Zentralbereich angeordnet ist und daß sich mehr Rippen als in dem Zentralbereich in jedem der Seitenbereiche befinden,
    daß wenigstens eine Rippe in dem Zentralbereich eine vorbestimmte Höhe besitzt und jede der Rippen in jedem der zwei Seitenbereiche eine geringere Höhe als die vorbestimmte Höhe besitzt, und
    daß ein Teil des Aufzeichnungsmediums (P), das der nach innen eingezogenen gebogenen Oberfläche gegenüberliegt, gegen die wenigstens eine Rippe in dem Zentralbereich der nach innen eingezogenen gebogenen Oberfläche gepreßt wird, wenn das Aufzeichnungsmedium von dem zweiten Ende der gebogenen Durchführung ausgesendet wird und das Vorderende des Aufzeichnungsmediums die Registereinheit (14) kontaktiert, wodurch das Aufzeichnungsmedium auf der wenigstens einen Rippe in dem Zentralbereich der nach innen eingezogenen gebogenen Oberfläche gleiten kann, um das Aufzeichnungsmedium auf die Druckeinheit auszurichten, wenn das Aufzeichnungsmedium in der geraden Durchführung und der gebogenen Durchführung schief läuft und die Registereinheit dem Aufzeichnungsmedium gestattet, zu der Druckeinheit in einem vorbestimmten Zeittakt zu verlaufen, nach dem das Aufzeichnungsmedium ausgerichtet ist.
  2. Zuführvorrichtung für ein Aufzeichnungsmedium nach Anspruch 1, dadurch gekennzeichnet, daß die Höhen der mehreren Rippen (18') in jedem Seitenbereich abnehmen, wenn eine Position jeder der mehreren Rippen weiter von dem Zentralbereich in der Querrichtung entfernt ist.
  3. Zuführvorrichtung für ein Aufzeichnungsmedium nach Anspruch 1, dadurch gekennzeichnet, daß die mehreren Rippen (18') in den Seitenbereichen die gleiche Höhe besitzen.
EP96106679A 1995-04-26 1996-04-26 Zuführvorrichtung für einen Aufzeichnungsträger Expired - Lifetime EP0740218B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP10195995 1995-04-26
JP101959/95 1995-04-26
JP7101959A JPH08295439A (ja) 1995-04-26 1995-04-26 給紙装置

Publications (2)

Publication Number Publication Date
EP0740218A1 EP0740218A1 (de) 1996-10-30
EP0740218B1 true EP0740218B1 (de) 2001-08-16

Family

ID=14314414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96106679A Expired - Lifetime EP0740218B1 (de) 1995-04-26 1996-04-26 Zuführvorrichtung für einen Aufzeichnungsträger

Country Status (4)

Country Link
EP (1) EP0740218B1 (de)
JP (1) JPH08295439A (de)
KR (1) KR960038509A (de)
DE (1) DE69614440T2 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6149045A (en) * 1995-04-26 2000-11-21 Toshiba Tec Kabushiki Kaisha Paper sheet supplying apparatus having a raised central region for preventing a paper sheet from skewing as the sheet is fed
US5904350A (en) * 1997-01-31 1999-05-18 Tektronix, Inc. Apparatus and method for deskewing media in a printer
JP2006151564A (ja) * 2004-11-29 2006-06-15 Kyocera Mita Corp シート搬送装置
JP2010143707A (ja) 2008-12-18 2010-07-01 Seiko Epson Corp スキュー補正装置及び記録装置
JP5282556B2 (ja) 2008-12-18 2013-09-04 セイコーエプソン株式会社 スキュー補正装置及び記録装置
JP6007616B2 (ja) 2012-06-22 2016-10-12 株式会社リコー シート搬送装置、画像読取装置、画像形成装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4994864A (en) * 1989-12-07 1991-02-19 Xerox Corporation Copy sheet skew adjustment device
JPH061514A (ja) * 1992-06-17 1994-01-11 Canon Inc シート搬送装置
US5456456A (en) * 1992-07-13 1995-10-10 Mita Industrial Co., Ltd. Paper feeding device having paper inverting means

Also Published As

Publication number Publication date
EP0740218A1 (de) 1996-10-30
DE69614440T2 (de) 2002-03-28
JPH08295439A (ja) 1996-11-12
KR960038509A (ko) 1996-11-21
DE69614440D1 (de) 2001-09-20

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