EP1394087A2 - Bogenzuführvorrichtung und Bilderzeugungsvorrichtung - Google Patents

Bogenzuführvorrichtung und Bilderzeugungsvorrichtung Download PDF

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Publication number
EP1394087A2
EP1394087A2 EP03255375A EP03255375A EP1394087A2 EP 1394087 A2 EP1394087 A2 EP 1394087A2 EP 03255375 A EP03255375 A EP 03255375A EP 03255375 A EP03255375 A EP 03255375A EP 1394087 A2 EP1394087 A2 EP 1394087A2
Authority
EP
European Patent Office
Prior art keywords
paper
pick
pickup
roller
frame
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Withdrawn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
EP03255375A
Other languages
English (en)
French (fr)
Other versions
EP1394087A3 (de
Inventor
Seung-Jae Lee
Deuk-Hwan Chang
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics 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
Priority claimed from KR10-2002-0052225A external-priority patent/KR100474481B1/ko
Priority claimed from KR10-2003-0035170A external-priority patent/KR100512966B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1394087A2 publication Critical patent/EP1394087A2/de
Publication of EP1394087A3 publication Critical patent/EP1394087A3/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Withdrawn legal-status Critical Current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
    • B65H3/0684—Rollers or like rotary separators on moving support, e.g. pivoting, for bringing the roller or like rotary separator into contact with the pile
    • 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
    • B65H3/56—Elements, e.g. scrapers, fingers, needles, brushes, acting on separated article or on edge of the pile
    • 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
    • B65H2301/42324—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 from top of the pile
    • B65H2301/423245—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 from top of the pile the pile lying on a stationary support, i.e. the separator moving according to the decreasing height of the pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/113—Front, i.e. portion adjacent to the feeding / delivering side
    • B65H2405/1136—Front, i.e. portion adjacent to the feeding / delivering side inclined, i.e. forming an angle different from 90 with the bottom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/20—Location in space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
    • B65H2511/40—Identification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/81—Rigidity; Stiffness; Elasticity

Definitions

  • the present invention relates to a sheet supply apparatus for an image forming apparatus comprising sheet holding means for holding a stack of sheets to have images formed thereon, sheet separation means for separating sheets being fed from the sheet holding means and a sheet feeding roller for feeding sheets from the top of a stack of sheets held by the sheet holding means towards the sheet separation means.
  • an image forming apparatuses such as laser printers and photocopiers have removable paper cassettes and pick-up devices for withdrawing sheets of paper from the cassettes so that images can be formed on them.
  • a paper supply device of a conventional image forming apparatus includes a cassette 3 holding a stack of paper 1 and which has a friction resistance plate 2 inclined by a predetermined angle in contact with leading edges of the paper sheets 1, and a pick-up roller 5 rotatably supported at the distal end of a pick-up arm 4 for driving the top paper sheet 1 out of the cassette 3.
  • a gear train 6 for driving the roller 5 is located inside the pick-up arm 4 for transmitting drive from a motor (not shown) to the pick-up roller 5.
  • the pick-up roller 5 comes into contact with the paper sheet 1 at a fixed distance X from the friction resistance plate 2 regardless of paper characteristics such as thickness, surface roughness and strength. Therefore, in the case of printing on thin paper, which is usually weak, more than one sheet may be driven at the same time over the resistance plate 2 causing a paper jam. Whereas, in the case of printing on thick paper, which is usually strong, the paper may jam rather than being fed smoothly out of the cassette. Also, in order to feed thick paper without jamming, the torque of the motor has to be continuously increased, thereby causing the problems of increased power consumption and increased noise.
  • An apparatus according to the present invention is characterised in that the sheet feeding roller is moveable between advanced and retracted positions relative to the sheet separation means.
  • the sheet holding means is a cassette.
  • the sheet feeding roller is mounted to the distal end of an arm which is pivotably mounted at its proximal end.
  • a gear train is provided on the arm for rotating the sheet feeding roller.
  • the arm may include an elbow for allowing repositioning of the sheet feeding roller, preferably by a mechanism, comprising a link coupled to the arm below the elbow.
  • An actuator may be provided for operating said mechanism.
  • the arm may be pivotably mounted at its proximal end to a carriage which is mounted for reciprocal movement and preferably driven by a motor.
  • the apparatus includes a sensor for sensing a characteristic of a sheet held by the sheet holding means, driving means for moving the sheet feeding roller between sheet feeding positions and control means responsive to the output of the sensor to control the driving means to position the sheet feeding roller in dependence on the sensed sheet type.
  • a paper feed device of an image forming apparatus includes a paper cassette 10, a pick-up rollers 20, a pick-up arm 30 carrying the pick-up rollers 20 on either side of it's distal end and a pick-up position varying unit 40.
  • the paper feeding cassette 10 has a space defined therein, in which a plurality of sheets of paper are stacked, and has a friction resistance plate 11 inclined by a predetermined angle to come into contact with the leading edges of the paper sheets.
  • the friction resistance plate 11 causes the paper sheets, moved by the pick-up rollers 20, to be separated so that sheets are fed out of the cassette one at a time.
  • the pick-up rollers 20 are rotated in contact with the topmost sheet of paper in the cassette 10, thereby moving the topmost sheet toward the friction resistance plate 11.
  • the pick-up arm 30 pivotably supports the pick-up rollers 20 and includes a gear train 31 to transmit drive from a motor (not shown) to the pick-up rollers 20.
  • the pick-up position varying unit 40 moves the pick-up rollers 20 between at least two pick-up positions, which are pre-set in dependence with the different characteristics of the paper sheets that could be stacked in the cassette 10 such as thickness and strength, thereby ensuring that the pick-up position of the pick-up rollers 20 is suitable for the characteristics of the paper.
  • a first pick-up position is at a distance L1 from the friction resistance plate 11 and the pick-up rollers 20 are placed at the first position when the pick-up rollers 20 are to pick up strong thick paper.
  • a second pick-up position is at a shorter distance L2 from the friction resistance plate 11 and the pick-up rollers 20 are placed at the second pick-up position when the pick-up rollers 20 are to pick up weak thin paper.
  • the arm 30 has an elbow 51 where a distal portion 50 is pivotably coupled to the upper part of the arm 30.
  • the pick-up position varying unit 40 includes the distal portion 50 of the arm 30, a driving unit 60 and a control unit 70.
  • the distal portion 50 of the arm 30 is disposed at the pick-up arm 30 to rotate about an axis 51 to a predetermined angle.
  • a pickup roller shift 52 is included through the distal portion 50 of the arm 30.
  • Two pick-up rollers 20 are mounted on both sides of the pick-up roller shaft 52.
  • the driving unit 60 pivots the distal portion 50 of the arm 30 at the elbow 51 to move the pick-up rollers 20 between the first and the second pick-up positions.
  • the driving unit 60 includes a pair of first link members 61, 61A having first ends connected to opposite sides of the distal portion 50 of the arm 30 and extending backward from the distal portion 50 of the arm 30, a pair of second link members 63, 63A having first ends coupled to second ends of respective first link members 61, 61A, which are opposite the first ends of the first link members, by a respective pin 62, 62A, a third link member 65 having a first end fixed to a shaft 64, that is fixed to the second ends of the second link members 63, 63A which are opposite the first ends of the second link members, and an actuator 66 connected to the other end of the third link member 65, to drive the link members 61, 61 A, 63, 63A, and 65.
  • a single first link member and a single second link member replace the pairs of first and second link members, respectively.
  • the actuator 66 in the present embodiment is a solenoid.
  • a frame (not shown) supports the shaft 64 .
  • the control unit 70 detects characteristics of the paper sheets stacked in the paper feeding cassette 10 and controls the actuator 66 based on the detected information.
  • a sensor 80 detects the characteristics, such as thickness and strength, of the paper sheets stacked in the paper feeding cassette 10. However, manual input of paper type may be provided for.
  • the control unit 70 receives a signal from the sensor 80, determines the characteristics of the paper sheets based on the received signal, and controls the operation of the actuator 66 according to the determined paper characteristics.
  • the gear train 31 provided in the pick-up arm 30 is comprised of a plurality of gears, which are interposed between a driving shaft 33 and the pick-up roller shaft 52, disposed through the distal portion 50 of the arm 30.
  • the driving shaft 33 extends through the proximal end of the pick-up arm 30.
  • a input gear 32 is mounted on the driving shaft 33. Accordingly, a driving force generated by a motor (not shown) is transmitted to the driving shaft 33 through the input gear 32 and then to the pick-up roller shaft 52 through the gear train 31 to rotate the pick-up rollers 20.
  • the paper pick-up device detects characteristics of the paper sheets stacked in the paper feeding cassette 10 by means of the sensor 80 and transmits the detected paper characteristic information to the control unit 70.
  • the control unit 70 determines a pick-up position for the pick-up rollers 20, based on the detected paper characteristic information, by referring to pre-stored information and the detected paper characteristic information.
  • the image forming apparatus may be designed such that a user himself/herself can provide the paper type to the printer driver software using, for example, a dialog.
  • the paper characteristic information is transmitted to the control unit 70 and the control unit 70 accordingly determines a pick-up position for the pick-up rollers 20.
  • the actuator 66 is driven backward, if necessary, in the direction indicated by the arrow in Figure 2, by the control unit 70.
  • the third link member 65 is pulled towards the actuator 66 rotating the shaft 64 and the second link members 63, 63A.
  • the first link member 61, 61A connected to the second link members 63, 63A advance in the direction opposite that indicated by the arrow in Figure 2. Due to the movement of the first link members 61, 61A, the distal portion 50 of the arm 30 pivots at the elbow 51 so that the pick-up rollers 20 are positioned at the second pick-up position which is L2 from the friction resistance plate 11.
  • the actuator 66 is driven forward, if necessary, in the direction indicated by the arrow in Figure 3.
  • the third link member 65 is pushed away from the actuator 66 rotating the shaft 64 and the second link members 63, 63A.
  • the first link member 61, 61A connected to the second link members 63, 63A retreat in the direction opposite that indicated by the arrow in Figure 3. Due to the movement of the first link members 61, 61A, the distal portion 50 of the arm 30 pivots at the elbow 51 so that the pick-up rollers 20 are positioned at the first pick-up position which is L1 from the friction resistance plate 11.
  • the pick-up roller 20 when the pick-up roller 20 is positioned at the first pick-up position to thus broaden a gap between the friction resistance plate 11 and the pick-up roller 20, the strength of the paper per a length of the paper is decreased.
  • the resistance force at the friction resistance plate 11 becomes as much as is obtained when thin paper is picked-up. That is, with the same degree of the pick-up driving force, the thick paper can be picked up.
  • the driving force is transmitted from the motor (not shown) to the pick-up rollers 20 via the input gear 32, the shaft 33 and the gear train 31 to rotate the pick-up rollers 20. Then, due to the friction occurring between the rotating pick-up rollers 20 and the paper, the topmost sheet is moved to the friction resistance plate 11 and the sheet is separated from the underlying sheet by the friction resistance plate 11.
  • the second and third link members are combined to form a single feature (not shown) that pivots around a central point when the actuator 66 is operated.
  • another paper feed device includes a paper cassette 100, pick-up rollers 200, a pick-up frame 300, a pick-up arm 400 and a pick-up position varying unit 500.
  • the paper feeding cassette 100 has a space defined therein to stack a plurality of sheets of paper 1 and a friction resistance plate 110 inclined by a predetermined angle to contact with the leading ends of the paper sheets 1.
  • the friction resistance plate 110 separates the paper moved by the pick-up rollers 200 sheet by sheet.
  • the paper cassette 100 is removably mounted in a cassette mounting portion 610 provided in the body 600 of the image forming apparatus.
  • the pick-up rollers 200 are rotated in contact with the topmost sheet of the paper sheets 1 stacked on the paper cassette 100 and move the topmost sheet toward the friction resistance plate 110.
  • the pick-up rollers 200 are rotatably disposed at the distal end of the pick-up arm 400.
  • the pick-up arm 400 is provided with a gear train 420, as shown in Figure 8, to transmit drive from a first motor 410 to the pick-up rollers 200.
  • the pick-up arm 400 is movably disposed on the pick-up frame 300.
  • the pick-up position varying unit 500 moves the pick-up arm 400 in order for the pick-up rollers 200 to be positioned at one of at least two pick-up positions which are pre-set in accordance with the different papers that may be printed on.
  • the two pick-up positions includes a first pick-up position at a distance L1 from the friction resistance plate 110 and a second pick-up position at a distance L2, which is less than L1, from the friction resistance plate 110.
  • the pick-up rollers 200 are placed at the first pick-up position for feeding strong, thick paper and at the second position for feeding weak, thin paper.
  • the pick-up position varying unit 500 includes a reciprocally movable carriage 510 to which the arm 400 is pivotably coupled at its proximal end, a drive unit 520 and a control unit 70 (see Figure 4).
  • a pair of guide bars 511, 512 protrude outwardly from both sides of the carriage 510 and a pair of guide grooves 311, 312 in the pick-up frame 300 receive the ends of the guide bars 511, 512 to guide the movement of the carriage 510 in the pick-up frame 300.
  • the first guide bar 511 passes through both the arm 400 and the carriage 510.
  • the pick-up arm 400 is pivotable about the first guide bar 511 so that the pick-up rollers 200 can comes into contact with the topmost sheet stacked on the paper cassette 100 irrespective of the amount of paper in the cassette 100.
  • the drive unit 520 drives the carriage 510 reciprocally in the pick-up frame 300.
  • the drive unit 520 includes a rack 521 disposed on the carriage 510, a pinion 522 engaged with the rack member 521 and a second motor 523 disposed in the pick-up frame 300 for rotating the pinion 522.
  • the control unit 70 performs the same operation as in the above-described embodiment. That is, the control unit 70 detects characteristics of the paper and controls the second motor 523 based on the detected paper characteristic information.
  • the paper pick-up device includes a sensor 80 to detect characteristics of the paper such as thickness and strength according to a paper type, so that the control unit 70 receives a signal from the sensor 80, determines the characteristic of the paper according to the paper type, and accordingly controls the second driving motor 523 based on the determined characteristics.
  • the basic operations are performed in the same way as in the above-described embodiment. That is, when a printing command is input, the sensor 80 detects the characteristics of the paper stacked in the paper cassette 100 and transmits the information to the control unit 70. The control unit 70 determines a pick-up position for the pick-up roller 200 based on the detected paper characteristic information, and then controls the second motor 523 so that the pick-up roller 200 is moved to the determined pick-up position, if not already there.
  • the second motor 523 is driven clockwise to move the pick-up rollers 200 to the second pick-up position L2. Then, the carriage 510 and pick-up arm 400 are advanced by the pinion 522 and the rack 521 so that the pick-up rollers 200 are positioned at the second pick-up position. Then drive from the first driving motor 410 is transmitted to the pick-up rollers 200 through the gear train 420 to rotate the pick-up rollers 200. Due to the rotation of the pick-up rollers 200 and the friction between the pick-up rollers 200 and the top sheet of paper, the topmost paper sheet alone is picked up and fed towards the friction resistance plate 110.
  • the pick-up rollers 200 are positioned at the second pick-up position, the strength per a length of the paper becomes high. Accordingly, since there occurs a resistance force at the friction resistance plate 110 as that occurring of the resistance force when thick paper is picked-up, the paper is picked-up without multiple transferring.
  • the second motor 523 is driven anticlockwise to move the pick-up rollers 200 to the first pick-up position, if not their already.
  • the pick-up arm 400 is advanced so that the pick-up roller 200 is moved from the second pick-up position to the first pick-up position.
  • the strength per the length of the paper becomes low.
  • the thick paper is picked up with the same level of the pick-up force that picks up the thin paper.
  • the pick-up device of the image forming apparatus picks up the paper sheets with a variably changing pick-up position in accordance with the characteristic, such as thickness and surface roughness, of the paper, thereby preventing paper slip, multiple transferring, and paper jam during the conveyance of the paper. Accordingly, there is an advantage of having precise paper picking-up and conveying operations.
  • a pick-up force is variable controlled by changing the pick-up position according to the characteristic of the paper, power consumption and noise can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP03255375A 2002-08-31 2003-08-29 Bogenzuführvorrichtung und Bilderzeugungsvorrichtung Withdrawn EP1394087A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2002-0052225A KR100474481B1 (ko) 2002-08-31 2002-08-31 화상형성기의 용지 픽업장치
KR2002052225 2002-08-31
KR10-2003-0035170A KR100512966B1 (ko) 2003-05-31 2003-05-31 화상형성기의 용지 픽업장치
KR2003035170 2003-05-31

Publications (2)

Publication Number Publication Date
EP1394087A2 true EP1394087A2 (de) 2004-03-03
EP1394087A3 EP1394087A3 (de) 2005-01-19

Family

ID=31497747

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03255375A Withdrawn EP1394087A3 (de) 2002-08-31 2003-08-29 Bogenzuführvorrichtung und Bilderzeugungsvorrichtung

Country Status (3)

Country Link
US (1) US20040046309A1 (de)
EP (1) EP1394087A3 (de)
CN (1) CN1235748C (de)

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DE102007018398A1 (de) * 2007-04-17 2008-10-23 Bdt Ag Blattvereinzelungssystem, Blatthandhabungssystem und Verfahren zum reibschlüssigen Reparieren und Fördern von Blättern

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US6896254B2 (en) * 2003-03-28 2005-05-24 Hewlett-Packard Development Company, L.P. Auto compliant pick arm
DE102004038753B3 (de) * 2004-08-09 2005-09-08 Bdt Ag Vorrichtung zum Vereinzeln von Blättern eines Aufzeichnungsträgers
JP4829736B2 (ja) * 2005-10-05 2011-12-07 キヤノン株式会社 画像形成装置
DE102005056634B4 (de) * 2005-11-25 2010-07-22 Bdt Ag Blattvereinzelungssystem, Verfahren zum reibschlüssigen Separieren und Fördern von Blättern
US20080224380A1 (en) * 2007-03-14 2008-09-18 Yraceburu Robert M Media pick assembly with motorized carriage
US7717417B2 (en) * 2007-06-20 2010-05-18 Lexmark International, Inc. Devices for improving the reliability of feeding media sheets within an image forming device
CN102180028B (zh) * 2011-01-26 2013-04-03 合肥海闻机器人开发有限公司 一种专用于亚克力的打印机平移器
JP6265727B2 (ja) * 2013-12-17 2018-01-24 キヤノン株式会社 供給装置、記録媒体の供給方法、および記録装置
JP2017065878A (ja) * 2015-09-30 2017-04-06 ブラザー工業株式会社 シート搬送装置及び画像形成装置
JP2022016966A (ja) * 2020-07-13 2022-01-25 キヤノン株式会社 シート給送装置、及び画像形成装置
US20230056979A1 (en) * 2021-08-19 2023-02-23 Toshiba Tec Kabushiki Kaisha Paper feeding device

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EP0534245A1 (de) * 1991-09-24 1993-03-31 BDT Büro- und Datentechnik GmbH Verfahren und Vorrichtung zum Vereinzeln von blattförmigen Aufzeichnungsträgern
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Publication number Priority date Publication date Assignee Title
DE102007018398A1 (de) * 2007-04-17 2008-10-23 Bdt Ag Blattvereinzelungssystem, Blatthandhabungssystem und Verfahren zum reibschlüssigen Reparieren und Fördern von Blättern

Also Published As

Publication number Publication date
EP1394087A3 (de) 2005-01-19
CN1495035A (zh) 2004-05-12
US20040046309A1 (en) 2004-03-11
CN1235748C (zh) 2006-01-11

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