EP0908405B1 - Papierzuführkassette mit einstellbarer Andrücksvorrichtung - Google Patents
Papierzuführkassette mit einstellbarer Andrücksvorrichtung Download PDFInfo
- Publication number
- EP0908405B1 EP0908405B1 EP98119052A EP98119052A EP0908405B1 EP 0908405 B1 EP0908405 B1 EP 0908405B1 EP 98119052 A EP98119052 A EP 98119052A EP 98119052 A EP98119052 A EP 98119052A EP 0908405 B1 EP0908405 B1 EP 0908405B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- paper
- shaft
- pickup device
- 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.)
- Expired - Lifetime
Links
Images
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.
- US 5, 443, 252 An attempt to exert various paper pick-up forces in a paper feeding cassette is known from US 5, 443, 252.
- the sheet supplying means of US 5, 443, 252 comprise a knock-up plate, a compressed coil spring under the knock-up plate and an adjustable pressing means.
- This adjustable pressing means is connected to a pressurizing shaft by means of a tension coil spring. It is operated by the extensions of the shaft being shifted downwardly along cam grooves when inserting a paper cassette into the device.
- the additional pressing means is adjusted automatically to a fixed value when the cassette is inserted to the device in order to exert different forces on the knock-up plate depending on whether the cassette is inside or outside the device.
- two pairs of such cam grooves may be provided to accommodate paper feeding cassettes of two different sizes.
- the pressure exerted on the paper pile depends only on the cassette used and not on the properties of the paper pile itself.
- JP A 07 206 180 Another attempt to accommodate different paper loads in a sheet supplying apparatus is known from JP A 07 206 180.
- a changeover lever is used to operate a relatively complicated mechanism in order to adjust the pressing force exerted on a pile of paper.
- 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 113 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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Claims (12)
- Papieraufnehmervorrichtung in einer Papierzuführkassette (10) mit einer Hochstoßplatte (13) und einer zusammengedrückten Schraubenfeder unter der Hochstoßplatte (13), die die Hochstoßplatte nach oben drückt und eine Papieraufnehmerkraft erzeugt, sowie wenigstens einer verstellbaren Drückeinrichtung, die in einem vorderen Abschnitt der Papierzuführkassette (10) installiert ist, um einen regulierbaren Druck zu dem nach oben gerichteten Druck, der von der zusammengedrückten Schraubenfeder ausgeübt wird, hinzuzufügen, dadurch gekennzeichnet, dass die verstellbare Drückeinrichtung wenigstens einen gekrümmten Schlitz (16) an einem vorderen Abschnitt jeder Seitenwand (15) der Papierzuführkassette (10) umfasst, und dass die verstellbare Drückeinrichtung durch den Benutzer an der Außenseite der Papierzuführkassette (10) manuell zwischen wenigstens zwei Druckwerten verstellt werden kann, indem direkt eine Welle (20) betätigt wird, deren beide Enden vorstehend in die gekrümmten Schlitze (16) eingeführt sind.
- Papieraufnehmervorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die beiden Druckwerte ein Null-Druck und ein positiver Druck eines vorgegebenen Wertes sind.
- Papieraufnehmervorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die regulierbare Drückeinrichtung wenigstens umfasst:eine Gelenkwelle (30), die durch ein Gelenk drehbar mit beiden Seitenwänden (15) der Papierzuführkassette (10) verbunden ist;eine Teilplatte (31), die sich von einem Abschnitt der Gelenkwelle (30) unter der Hochstoßplatte (13) erstreckt, undeine Einrichtung, die die Teilplatte nach oben drückt und in einem vorderen Abschnitt der Papierzuführkassette (10) installiert ist, um Druck zu dem nach oben gerichteten Druck der zusammengedrückten Schraubenfeder hinzuzufügen.
- Papieraufnehmervorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Einrichtung zum Drücken nach oben wenigstens umfasst:ein Verbindungselement (32), dass sich von jeder der Gelenkwellen (30) bis zu einer vorgegebenen Länge in einer Richtung senkrecht zu der Teilplatte (31) erstreckt und wenigstens einen ersten Eingriffsabschnitt (33) an einem Ende aufweist, undein federndes Element (40), dessen eines Ende mit jedem Ende der Welle (20) verbunden ist und dessen anderes Ende mit dem ersten Eingriffsabschnitt (33) jedes ersten Verbindungselementes (32) verbunden ist, um die Welle (20) und das Verbindungselement (32) zu veranlassen, Zugkraft aufeinander auszuüben.
- Papieraufnehmervorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass die federnden Elemente (40) Zug-Schraubenfedern sind.
- Papieraufnehmervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass eine Anbringungsnut (21) einer vorgegebenen Tiefe in jedem Endabschnitt der Welle (20) um den Außenumfang herum ausgebildet ist, um zu verhindern, dass die Welle aus der Position in dem ersten gekrümmten Schlitz (16) heraustritt.
- Papieraufnehmervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass beide Endabschnitte der ersten gekrümmten Schlitze (16) als Kreis geformt sind, dessen Durchmesser größer ist als die Breite der ersten Schlitze, um die Welle (20) in die Lage zu versetzen, sich leicht zu bewegen und die Welle in den ersten Schlitzen in Position zu halten.
- Papieraufnehmervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Verbindungselement (132) einen zweiten Eingriffsabschnitt (134) an einem anderen Ende aufweist;ein zweiter gekrümmter Schlitz (117) an einem Abschnitt wenigstens einer Seitenwand (115) der Papierzuführkassette (100) ausgebildet ist;ein Fixierelement (160) sich im Inneren der Papierzuführkassette (100) befindet;ein Hebel (150) an zwei Positionen gebogen ist und ein Ende (151) desselben vorstehend in den zweiten Schlitz (117) eingeführt ist und das andere Ende (152) durch ein Gelenk drehbar mit dem Fixierelement (160) verbunden ist, undein Ende eines zweiten federnden Elementes (141) mit dem zweiten Eingriffsabschnitt (134) des Verbindungselementes (132) verbunden ist und das andere Ende mit dem Hebelende verbunden ist, um die Welle (120) und das Verbindungselement (132) zu veranlassen, Zugkraft aufeinander auszuüben.
- Papieraufnehmervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass eine Anschlageinrichtung (173) in der Nähe des zweiten Schlitzes (117) angeordnet ist, um Bewegung des Endes des Hebels (150) anzuhalten.
- Papieraufnehmervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die zweiten federnden Elemente (141) Zug-Schraubenfedern sind.
- Papieraufnehmervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass ein Riegel (170) unmittelbar über dem zweiten Schlitz (117) an der Seitenwand (115) der Papierzuführkassette (100) mit einem Gelenk angebracht ist, um den zweiten Schlitz (117) teilweise abzudecken, und ein Anschlag (173) unter dem zweiten Schlitz vorsteht, um die Drehung des Riegels (170) einzuschränken.
- Papieraufnehmervorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Riegel (170) einen Knopf (172) enthält, der von der Außenfläche desselben vorsteht, um Bedienung durch einen Benutzer zu erleichtern.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR9727888 | 1997-10-08 | ||
KR2019970027888U KR200186325Y1 (ko) | 1997-10-08 | 1997-10-08 | 급지카세트의용지픽업장치 |
KR9730916 | 1997-11-03 | ||
KR2019970030916U KR200189812Y1 (ko) | 1997-11-03 | 1997-11-03 | 급지카세트의 용지픽업장치 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0908405A1 EP0908405A1 (de) | 1999-04-14 |
EP0908405B1 true 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)
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04286550A (ja) * | 1991-03-11 | 1992-10-12 | Canon Inc | シート材給送装置 |
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 |
JP3375027B2 (ja) * | 1995-07-21 | 2003-02-10 | 株式会社リコー | 画像形成装置における給紙装置 |
-
1998
- 1998-10-08 CN CNB981246737A patent/CN1178795C/zh not_active Expired - Fee Related
- 1998-10-08 DE DE69814284T patent/DE69814284T2/de not_active Expired - Lifetime
- 1998-10-08 EP EP98119052A patent/EP0908405B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69814284D1 (de) | 2003-06-12 |
DE69814284T2 (de) | 2003-11-13 |
CN1178795C (zh) | 2004-12-08 |
CN1222450A (zh) | 1999-07-14 |
EP0908405A1 (de) | 1999-04-14 |
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