EP0908405A1 - Papierzuführkassette mit einstellbarer Andrücksvorrichtung - Google Patents

Papierzuführkassette mit einstellbarer Andrücksvorrichtung Download PDF

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Publication number
EP0908405A1
EP0908405A1 EP98119052A EP98119052A EP0908405A1 EP 0908405 A1 EP0908405 A1 EP 0908405A1 EP 98119052 A EP98119052 A EP 98119052A EP 98119052 A EP98119052 A EP 98119052A EP 0908405 A1 EP0908405 A1 EP 0908405A1
Authority
EP
European Patent Office
Prior art keywords
paper
pickup device
shaft
feeding cassette
paper feeding
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
EP98119052A
Other languages
English (en)
French (fr)
Other versions
EP0908405B1 (de
Inventor
Seo-Won Park
Se-Hyun Lyu
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 KR2019970027888U external-priority patent/KR200186325Y1/ko
Priority claimed from KR2019970030916U external-priority patent/KR200189812Y1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP0908405A1 publication Critical patent/EP0908405A1/de
Application granted granted Critical
Publication of EP0908405B1 publication Critical patent/EP0908405B1/de
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
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/26—Supports or magazines for piles from which articles are to be separated with auxiliary supports to facilitate introduction or renewal of the pile
    • B65H1/266—Support fully or partially removable from the handling machine, e.g. cassette, drawer
    • 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
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/12—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device comprising 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
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • 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
    • B65H2515/30—Forces; Stresses
    • B65H2515/34—Pressure, e.g. fluid pressure

Definitions

  • the present invention relates to a paper feeding cassette in a laser beam printer (LBP) using an electrophotographic developing method, and in particular, to a paper pickup device installed to keep plural sheets of paper in a pickup position.
  • LBP laser beam printer
  • Electrophotographic development is generally used for a printer, copier, LBP, facsimile or the like.
  • a device is equipped with a paper feeding cassette to accommodate plural sheets of paper, and the paper feeding cassette has a paper pickup device for keeping the paper pile in a pickup position.
  • FIG. 1 is a perspective view of a conventional paper feeding cassette.
  • the conventional paper feeding cassette is a universal type including at least one of guides 201 and 202 for regulating placement of papers with different lengths and widths to accommodate papers of different sizes.
  • the paper feeding cassette 200 is comprised of a knock-up plate 203 elastically supported by one or more compressed coil springs 204, for loading a plurality of paper sheets.
  • the compressed coil springs 204 press up against the knock-up plate 203 to keep the paper pile of the knock-up plate 203 in a pickup position.
  • the paper is fed sheet by sheet from the knock-up plate 203 to a register roller (not shown) by a pickup roller (not shown) and a finger (not shown).
  • the uppermost paper sheet of the paper pile is kept in contact with the pickup roller and transferred by the friction force between the paper and the pick up roller when the pickup roller rotates.
  • the paper feeding cassette 200 feeds papers of different sizes (e.g., A4 size, letter size, and OHP (OverHead Projector) film size) as a recording medium.
  • the papers differ in weight as well as in size and thickness.
  • the mechanism of setting the pickup position of paper by use of one or two compressed coil springs under a knock-up plate cannot cope with the weight difference in paper. Further, different loads are imposed on a universal type of cassette capable of containing 500 sheets of paper at maximum depending on the kinds of paper. In comparison of A4-size paper and A6-size paper, a paper tray receives a much larger load from the latter than the former. The resulting difference in pickup force makes paper feeding unreliable.
  • a paper pickup device in a paper feeding cassette having a knock-up plate having a knock-up plate.
  • a compressed coil spring is provided under the knock-up plate, for pressing up the knock-up plate and providing paper pickup force
  • a hinge shaft is rotatably connected to both sidewalls of the paper feeding cassette by a hinge
  • a sub-plate is extended from a portion of the hinge shaft, under the knock-up plate
  • means for pressing up the sub-plate is installed inside a frontal section of the paper feeding cassette to add to the upward pressure of the compressed coil spring.
  • FIG. 2 is a perspective view of a paper feeding cassette according to a preferred embodiment of the present invention
  • FIG. 3 is a schematic perspective view of a paper pickup device in the paper feeding cassette.
  • the paper pickup device is provided inside a front section 14 of the paper feeding cassette 10, and a knock-up plate 13 is installed on the bottom of the paper feeding cassette 10 to be rotatable with respect to a side thereof.
  • One or more guide members 11 and 12 are installed in the paper feeding cassette 10 movably in a paper feeding direction to regulate placement of papers with different lengths and in the direction perpendicular to the paper feeding direction to regulate placement of papers with different widths, respectively.
  • a curved slot 16 is formed on a frontal portion of each side wall 15 of the paper feeding cassette 10 to movably insert a shaft 20 thereinto.
  • a hinge hole is formed at one side of each slot 16, for inserting a hinge shaft 30 thereinto. Both end portions of the slot 16 are shaped into circles of a larger diameter than the width of the slot 16 so as to keep the shaft 20 in position.
  • both ends of the hinge shaft 30 are rotatably extended through the hinge holes in the paper pickup device.
  • Under the knock-up plate 13 is a sub-plate 31 extended from a portion of the hinge shaft 30 in the paper feeding direction.
  • a connecting member 32 is vertically extended from each of both end portions of the hinge shaft 30, for acting as a lever to apply an upward pressure to the sub-plate 31, and has an engaging portion 33 formed at an end of the connecting member 32. That is, the sub-plate 31, the connecting member 32, and the engaging portion 33 are all integrated with the hinge shaft 30.
  • the shaft 20 of a predetermined length is inserted into the slots 16 on both the side walls 15 of the paper feeding cassette 10 shown in FIG. 2, with both ends of the shaft 20 extending through the slots 16.
  • a mounting groove 21 is formed around the outer circumference of each end portion of the shaft 20 to a predetermined depth to be caught in the slot 16. Therefore, the shaft 20 may move along the curved slots 16 by user manipulation.
  • a resilient member connects an end portion of the shaft 20 with the engaging portion 33 of each connecting member 32 so that the shaft 20 and the connecting member 32 exert tensile force on each other.
  • a tension coil spring 40 is used as the resilient member.
  • FIG. 4 is a partial side view of the paper pickup device according to the first embodiment of the present invention, illustrating the position of the shaft when the tension coil spring is not strained.
  • FIG. 5 is a partial side view of the paper pickup device according to the first embodiment of the present invention, illustrating the position of the shaft when the tension coil spring is strained.
  • the sub-plate presses up the knock-up plate in a single stage.
  • the sub-plate works in two stages by use of at least two resilient members, preferably tension coil springs.
  • FIG. 6 is a perspective view of a paper feeding cassette according to the second embodiment of the present invention
  • FIG. 7 is a perspective view of a paper pickup device in the paper feeding cassette according to the second embodiment of the present invention.
  • the paper pickup device is provided inside a front section 114 of the paper feeding cassette 100, and a knock-up plate 113 is installed on the bottom of the paper feeding cassette 100 to be rotatable with respect to a side thereof.
  • One or more guide members 111 and 112 are installed in the paper feeding cassette 100 movably in a paper feeding direction to regulate placement of papers with different lengths and in the direction perpendicular to the paper feeding direction to regulate placement of papers with different widths, respectively.
  • a first slot 116 of a predetermined curvature is formed on a frontal portion of each side wall 115 of the paper feeding cassette 110 to movably insert a shaft 120 thereinto.
  • a hinge hole is formed at one side of each slot 116, for inserting one end of a hinge shaft 130 thereinto. Both end portions of the slot 116 are shaped into circles of a larger diameter than the width of the slot 116 so as to keep the shaft 120 in position.
  • a second slot 117 of a predetermined curvature is formed just above the first slot 116 on one of the sidewalls 115 of the paper feeding cassette 100 and also shaped into circles in both ends thereof.
  • a locker 170 of a predetermined shape is installed above the second slot 117 in such a manner that it can rotate around a hinge shaft 171 to cover the lower portion of the second slot 117, and a stopper 173 protrudes from below the second slot 117 to limit the rotation of the locker 170 at the time the locker 170 covers the lower portion of the locker 170. That is, the locker 170 is so installed that it freely moves around the hinge shaft 171, and is set in a stationary state by the stopper 173, while partially covering the second slot 117.
  • a knob 172 protrudes from the outer surface of the locker 170 to allow convenient user manipulation.
  • both ends of the hinge shaft 130 are rotatably extended through the hinge holes in the paper pickup device.
  • Under the knock-up plate 13 is a sub-plate 131 extended from a portion of the hinge shaft 130 in the paper feeding direction.
  • a connecting member 132 is vertically extended from each of both end portions of the hinge shaft 130, for acting as a lever to apply an upward pressure to the sub-plate 131, and has a first engaging portion 133 formed at an end of the connecting member 132 and a second engaging portion 134 extended from the first engaging portion 133. That is, the hinge shaft 130, the sub-plate 131, and the first and second engaging portions 133 and 134 are all integrally formed.
  • Both ends of the shaft 120 of a predetermined length are inserted to extend through the first slots 116 on both the side walls 115 of the paper feeding cassette 100 shown in FIG. 6.
  • a mounting groove 121 is formed around the outer circumference of each end portion of the shaft 120 to a predetermined depth to be caught in the first slot 116. Therefore, the shaft 120 may move along the curved first slots 116 by user manipulation.
  • a first resilient member connects an end portion of the shaft 120 with the first engaging portion 133 of each connecting member 132 so that the shaft 120 and the connecting member 132 exert tensile force on each other.
  • a tension coil spring 140 is used as the first resilient member.
  • a lever 150 bent at the right angle in two portions.
  • An end 151 of the lever 150 is protrusively inserted into the second slot 117 and the other end 152 thereof is rotatably connected to a fixing member 160.
  • the lever end 151 is rotatable upon the other lever end 152.
  • Both ends 151 and 152 of the lever 150 have a circular section to easily move or rotate.
  • a second resilient member connects the second engaging portion 134 of one of the connecting members 132 to a portion of the lever end 151 so that the connecting member 132 and the lever 150 exert tensile force on each other.
  • the second resilient member is preferably a tension coil spring, and referred to as a second tension coil spring 141 hereinafter.
  • FIG. 8 is a partial side view of the paper pickup device according to the second embodiment of the present invention, illustrating the positions of the shaft and the lever when neither the first tension coil spring nor the second tension coil spring is strained.
  • FIG. 9 is a partial side view of the paper pickup device according to the second embodiment of the present invention, illustrating the positions of the shaft and the lever when only the first tension coil spring is strained.
  • FIG. 10 is a partial side view of the paper pickup device according to the second embodiment of the present invention, illustrating the positions of the shaft and the lever when both the first and second tension coil springs are strained.
  • the upward pressure applied to the knock-up plate 113 is increased by user manipulation of the shaft 120 protrusively inserted into the first slots 116 and the lever end 151 protruded through the second slot 117.
  • the present invention is advantageous in that a user can control pickup force to paper depending on the loads of papers different in size and amount in a paper feeding cassette of an LBP, which contains papers of different sizes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
EP98119052A 1997-10-08 1998-10-08 Papierzuführkassette mit einstellbarer Andrücksvorrichtung Expired - Lifetime EP0908405B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR2019970027888U KR200186325Y1 (ko) 1997-10-08 1997-10-08 급지카세트의용지픽업장치
KR9727888 1997-10-08
KR9730916 1997-11-03
KR2019970030916U KR200189812Y1 (ko) 1997-11-03 1997-11-03 급지카세트의 용지픽업장치

Publications (2)

Publication Number Publication Date
EP0908405A1 true EP0908405A1 (de) 1999-04-14
EP0908405B1 EP0908405B1 (de) 2003-05-07

Family

ID=34380444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98119052A Expired - Lifetime EP0908405B1 (de) 1997-10-08 1998-10-08 Papierzuführkassette mit einstellbarer Andrücksvorrichtung

Country Status (3)

Country Link
EP (1) EP0908405B1 (de)
CN (1) CN1178795C (de)
DE (1) DE69814284T2 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102408023A (zh) * 2011-06-10 2012-04-11 刘安成 分纸斜
CN102785952A (zh) * 2012-08-20 2012-11-21 天津光电通信技术有限公司 办公设备左侧进纸用纸仓结构
CN103660618B (zh) * 2013-11-21 2015-10-21 浙江大学 便捷取纸装置
CN109703214A (zh) * 2019-02-26 2019-05-03 天津光电通信技术有限公司 一种简易式自动调整纸张类型的激光打印机纸仓

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07206180A (ja) * 1994-01-18 1995-08-08 Canon Inc シート給送装置及び画像形成装置
US5443252A (en) * 1991-03-11 1995-08-22 Canon Kabushiki Kaisha Sheet supplying apparatus for feeding sheets from cassettes having different sheet holding capacities
US5823525A (en) * 1995-07-21 1998-10-20 Ricoh Company Ltd. Methods of and systems for adjustably feeding image-carrying media of various sizes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5443252A (en) * 1991-03-11 1995-08-22 Canon Kabushiki Kaisha Sheet supplying apparatus for feeding sheets from cassettes having different sheet holding capacities
JPH07206180A (ja) * 1994-01-18 1995-08-08 Canon Inc シート給送装置及び画像形成装置
US5823525A (en) * 1995-07-21 1998-10-20 Ricoh Company Ltd. Methods of and systems for adjustably feeding image-carrying media of various sizes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 095, no. 011 26 December 1995 (1995-12-26) *

Also Published As

Publication number Publication date
DE69814284D1 (de) 2003-06-12
EP0908405B1 (de) 2003-05-07
DE69814284T2 (de) 2003-11-13
CN1178795C (zh) 2004-12-08
CN1222450A (zh) 1999-07-14

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