EP0615937A2 - Bogenzuführvorrichtung - Google Patents

Bogenzuführvorrichtung Download PDF

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Publication number
EP0615937A2
EP0615937A2 EP94103936A EP94103936A EP0615937A2 EP 0615937 A2 EP0615937 A2 EP 0615937A2 EP 94103936 A EP94103936 A EP 94103936A EP 94103936 A EP94103936 A EP 94103936A EP 0615937 A2 EP0615937 A2 EP 0615937A2
Authority
EP
European Patent Office
Prior art keywords
sheet
sheets
feed roller
face
forward edge
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Withdrawn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
EP94103936A
Other languages
English (en)
French (fr)
Other versions
EP0615937A3 (de
Inventor
Shigemitsu C/O Nec Corporation Matsumori
Hironori C/O Toshin Electric Co. Ltd. Nakamura
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Publication of EP0615937A2 publication Critical patent/EP0615937A2/de
Publication of EP0615937A3 publication Critical patent/EP0615937A3/de
Withdrawn legal-status Critical Current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
    • B65H3/00—Separating articles from piles
    • B65H3/02—Separating articles from piles using friction forces between articles and separator
    • B65H3/06—Rollers or like rotary separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/02—Supports or magazines for piles from which articles are to be separated adapted to support articles on edge
    • B65H1/022—Supports or magazines for piles from which articles are to be separated adapted to support articles on edge with non-controlled means for advancing the pile to present the pile to the separating device, e.g. weights or spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/423—Depiling; Separating articles from a pile
    • B65H2301/4232—Depiling; Separating articles from a pile of horizontal or inclined articles, i.e. wherein articles support fully or in part the mass of other articles in the piles
    • B65H2301/42328—Depiling; Separating articles from a pile of horizontal or inclined articles, i.e. wherein articles support fully or in part the mass of other articles in the piles of inclined articles and inclination angle >45

Definitions

  • the present invention relates to a sheet feeder for feeding sheets one by one, and more particularly to a sheet feeder capable of feeding not only ordinary paper sheets of A4 and B4 sizes but also relatively thick sheets such as postal cards or postcards.
  • Conventional sheet feeders for printers or facsimile apparatuses which feed sheets of document or recording paper after separating them one by one, are classified into two types, one using a separation roller or a separation belt besides a feed roller and the other using separation claws provided on a hopper in which a plurality of sheets are stacked.
  • the former separates one of sheets stacked in a sheet tray by pressing front edges of the sheets with the separation roller which turns at low speed in the direction reverse to the feed roller, or by pressing the front edges with the separation belt having a high friction coefficient.
  • the thickness of sheets to be fed is considered in determining the position of the separation rollers or belt, variations of the thickness tends to invite sticking of two sheets (separation error) or jamming.
  • stacking of many (for instance more than 30) sheets deteriorates the accuracy of sheet separation, and a configuration to prevent this deterioration is required.
  • FIG. 1 shows a perspective view of a part of such a sheet feeder
  • FIG. 2 an A-A cross section of the sheet feeder of FIG. 1.
  • a plurality of sheets 50 are stacked in a hopper 25, and the top sheet is fed in the direction of arrow C by the rotation of feed rollers 21.
  • the sheets 50 are pressed by a back-up plate 23 and springs 24 against the feed rollers 21, and in this state separation claws 22 hold the corners of the sheets 50.
  • the separation claws 22 restrain the forward edge of the sheet to curve the sheet as shown by the broken line in FIG. 2, and eventually the curved part is driven by the sheet's own firmness to go over the separation claws 22, resulting in the separation of that top sheet.
  • the sheet feeder illustrated in FIGS. 1 and 2 whose stability of separation is determined by the correlation between the sheet thickness and the square measure of the separation, claws 22 and accordingly is affected by a variation in sheet thickness, is unfit for the feeding of such thicker items as postcards and envelopes.
  • An object of the present invention is to provide a sheet feeder which permits the stacking of a large number of sheets and moreover is capable of separating thicker items, such as postcards, one by one.
  • Another object of the invention is to provide a sheet feeder dispensing with such components as separation rollers, a separation belt and separation claws to hold the corners of sheets.
  • a sheet feeder comprises a housing provided with a sheet accommodation space in which a plurality of sheets are to be stacked and held; a separation plate which is arranged against the forward edge of the sheets held in the housing and whose surface in contact with the forward edge of the sheets is substantially perpendicular to a sheet face; a feed roller, arranged close to the separation plate, for feeding the uppermost one of the sheets held in the housing in the forward direction while in contact with the face of that sheet; and pressurizing means for applying pressure to the sheets toward the feed roller.
  • the separation plate has a tapered surface at its forward end included in the sheet feeding direction, so that the forward edge of the top sheet in contact with the feed roller runs against the tapered surface.
  • This arrangement facilitates separation of the top sheet from the next even if the sheets are thicker than usual because the top sheet, as its forward edge runs against the tapered surface, slides down in the sheet feeding direction.
  • the tapered face be included by 20 to 40 degrees along the sheet feeding direction against the surface with which the forward edge of the sheet comes into contact.
  • the close position of the feed roller to the separation plate causes the face of the top sheet, while it is being fed, to be firmly in contact with the tapered face of the separation plate to push back the forward edge of the next sheet under the top sheet and thereby prevents the forward edge of the next sheet from going over the tapered face.
  • the center axis of the feed roller is positioned within 20 mm from the extension surface of said separation plate which contacts with the forward edge of the sheet in a direction perpendicular to that surface.
  • FIG. 3 shows an oblique view of a sheet feeder which is a preferred embodiment of the present invention
  • FIG. 4 a B-B cross section of the sheet feeder of FIG. 3.
  • a sheet feeder housing 100 consists of a frame 4, side plates 3A and 3B fixed to the two sides of the frame 4, a rotary cover 5 opposite to the rear face of the frame 4, and a guide 6.
  • the guide 6, arranged close to a sheet outlet, is fixed between the side plates 3A and 3B.
  • At the top of the frame 4 is fixed a center guide 7 to support sheets.
  • FIG. 6 shows a perspective view of the sheet feeder of FIG. 3 with its cover 5 and guide 6 removed.
  • a feed roller 1 is located inside the guide 6, and a shaft 1A around the center axis of the roller 1 is supported by the side plates 3A and 3B via bearings 2.
  • the feed roller 1 should be built of a highly frictional material, preferably rubber.
  • One end of the shaft 1A is fixed to a gear 12, which engages with a gear 13 turned by power supplied from a motor (not shown) to rotate the feed roller 1 in the direction of the arrow in FIG. 6.
  • a plurality of sheets 50 are accommodated in a sheet accommodation space 8 among the rotary cover 5, guide 6 and frame 4. In that space are also arranged a pressurizing plate 9 and springs 10.
  • each spring 10 is fixed to the rear face of the frame 4, and the other end, to the pressurising plate 9,
  • the pressurising plate 9 is always pressed against the feed roller 1 by the springs 10, and slides while keeping contact with the surface of a separation plate 11 fixed in the vicinity of an exit of the frame 4.
  • the separation plate 11 is fixed in a direction perpendicular to the sheet face.
  • the tip of the rotary cover 5 causes the pressurizing plate 9 to escape into the inner part of the sheet accommodation space 8 against the elasticity of the springs 10.
  • the rotary cover 5, as illustrated in FIG. 7, is provided on its two sides with pressing projections 61 and 62 for pressing the pressurizing plate 9, and the length M of these projections is substantially equal to the width of the sheet accommodation space 8.
  • the plurality of sheets 50 are inserted through the sheet inlet 80, pass the sheet accommodation space 8 between the pressing projections 61 and 62, and run against the separation plate 11. After that, when the rotary cover 5 returns to its original position, the sheets 50 are pressed toward the feed roller 1 by the pressurizing plate 9. In this process, the rotary cover 5 performs the role of supporting the sheets 50.
  • the center axis of the feed roller 1 is away from the extension surface P extending from the surface of the separation plate 11 which the forward edges of the sheets come into contact with, by a distance L in the veritcal direction.
  • the distance L is set to be no more than 20 mm.
  • the distance L is 8 mm, the diameter of the feed roller 1, 10 mm, the height of the pressurizing plate 9 from the separation plate 11, 50 mm.
  • the separation plate 11 has toward its end the tapered face 11A inclined in the direction of the sheet outlet.
  • the angle ⁇ formed by the surface of the separation plate 11 and the tapered face 11A should desirably be 20 to 40 degrees. A greater angle ⁇ than that would invite the feeding of two stuck sheets, or a smaller angle ⁇ would cause the tapered face 11A stop the forward edge of the sheet to be separated and result in jamming.
  • the surface of the feed roller 1 is away by a distance N from a surface Q which is parallel to the sheet face and extends from the boundary between the tapered face 11A and the surface of the separation plate 11.
  • the distance N is required for making it easier for the forward edge of the sheet in contact with the feed roller 1 to run against the tapered face 11A, and is 2.8 mm in this embodiment.
  • no material having a high friction coefficient is unfit for the separation plate 11, but a plastic or metallic material having a smooth surface is suitable. So that small sheets, such as postcards, can be accurately guided to the feed roller 1, movable sheet regulating guides may be provided at the sheet inlet 80. Furthermore, when the sheet feeder is fitted to a printer, the sheet feeder housing 100 will lose none of the sheet separating effect whether the rear face of the frame 4 is positioned horizontally or inclined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP19940103936 1993-03-15 1994-03-14 Bogenzuführvorrichtung. Withdrawn EP0615937A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP52789/93 1993-03-15
JP5052789A JPH07109037A (ja) 1993-03-15 1993-03-15 シートフィーダ

Publications (2)

Publication Number Publication Date
EP0615937A2 true EP0615937A2 (de) 1994-09-21
EP0615937A3 EP0615937A3 (de) 1994-11-30

Family

ID=12924606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940103936 Withdrawn EP0615937A3 (de) 1993-03-15 1994-03-14 Bogenzuführvorrichtung.

Country Status (3)

Country Link
EP (1) EP0615937A3 (de)
JP (1) JPH07109037A (de)
KR (1) KR940021393A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953102A1 (de) 2007-01-31 2008-08-06 Neopost Technologies Vorrichtung zur Entnahme von Bogen eines Stapels

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406448A (en) * 1981-07-24 1983-09-27 Pitney Bowes Inc. Paper cassette
GB2187716A (en) * 1986-02-06 1987-09-16 Brother Ind Ltd Sheet feeding device with detachable holder means for thick cut sheets
JPH03216435A (ja) * 1990-01-19 1991-09-24 Nec Corp シートフィーダ
JPH043729A (ja) * 1990-04-19 1992-01-08 Tokyo Electric Co Ltd 給紙装置
JPH05286593A (ja) * 1992-04-14 1993-11-02 Nec Eng Ltd 給紙装置
JPH0616266A (ja) * 1991-12-18 1994-01-25 Seiko Epson Corp 給紙装置における分離爪退避機構

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS606027U (ja) * 1983-06-24 1985-01-17 ナショナル住宅産業株式会社 屋根用釘
JP2820514B2 (ja) * 1990-08-27 1998-11-05 三菱重工業株式会社 カード取出装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4406448A (en) * 1981-07-24 1983-09-27 Pitney Bowes Inc. Paper cassette
GB2187716A (en) * 1986-02-06 1987-09-16 Brother Ind Ltd Sheet feeding device with detachable holder means for thick cut sheets
JPH03216435A (ja) * 1990-01-19 1991-09-24 Nec Corp シートフィーダ
JPH043729A (ja) * 1990-04-19 1992-01-08 Tokyo Electric Co Ltd 給紙装置
JPH0616266A (ja) * 1991-12-18 1994-01-25 Seiko Epson Corp 給紙装置における分離爪退避機構
JPH05286593A (ja) * 1992-04-14 1993-11-02 Nec Eng Ltd 給紙装置

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 493 (M-1191) 13 December 1991 & JP-A-03 216 435 (NEC CORP) 24 September 1991 *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 145 (M-1233) 10 April 1992 & JP-A-04 003 729 (TOKYO ELECTRIC CO LTD) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 224 (M-1596) 22 April 1994 & JP-A-06 016 266 (SEIKO EPSON) 25 January 1994 *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 72 (M-1555) 7 February 1994 & JP-A-05 286 593 (NEC ENG LTD) 2 November 1993 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1953102A1 (de) 2007-01-31 2008-08-06 Neopost Technologies Vorrichtung zur Entnahme von Bogen eines Stapels

Also Published As

Publication number Publication date
EP0615937A3 (de) 1994-11-30
JPH07109037A (ja) 1995-04-25
KR940021393A (ko) 1994-10-17

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