JPH07237763A - Paper feeding device - Google Patents

Paper feeding device

Info

Publication number
JPH07237763A
JPH07237763A JP5818694A JP5818694A JPH07237763A JP H07237763 A JPH07237763 A JP H07237763A JP 5818694 A JP5818694 A JP 5818694A JP 5818694 A JP5818694 A JP 5818694A JP H07237763 A JPH07237763 A JP H07237763A
Authority
JP
Japan
Prior art keywords
paper
sheet
paper feed
uppermost
roller
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.)
Pending
Application number
JP5818694A
Other languages
Japanese (ja)
Inventor
Masaki Takahashi
正樹 高橋
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.)
Victor Company of Japan Ltd
Original Assignee
Victor Company of Japan 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
Application filed by Victor Company of Japan Ltd filed Critical Victor Company of Japan Ltd
Priority to JP5818694A priority Critical patent/JPH07237763A/en
Publication of JPH07237763A publication Critical patent/JPH07237763A/en
Pending legal-status Critical Current

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  • Handling Of Cut Paper (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

PURPOSE:To provide a paper feeding device which can feed paper sheets surely one by one free from the double feed of the paper sheets accommodated in a paper feeding cassette. CONSTITUTION:A lift plate 3 at the bottom part of a paper feeding cassette 2 is pushed up by a lift plate raising/lowering means 10, and a paper feeding roller 29 is brought into contact with the paper sheet P1 in the uppermost part. A paper reverse traveling preventing means 40 is operated to allow a paper sheet pressing member 47 to press the paper sheet P1. The paper feeding roller 29 is revolved reversely, and the paper sheet P1 is bulged in a projection form between the paper feeding roller 29 and the paper pressing member 47, and the paper sheet P1 is demounted from the separating hook 2a of the paper feeding cassette 2. Then, the paper pressing member 47 is separated from the paper sheet P1, and the paper sheet P1 is transferred by revolving the paper feeding roller 29 in the normal direction.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、給紙カセットに収納さ
れた用紙を給紙するための給紙装置に係り、特に、用紙
を1枚ずつ確実に給紙することができる給紙装置に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device for feeding paper stored in a paper feeding cassette, and more particularly to a paper feeding device capable of reliably feeding paper one by one. .

【0002】[0002]

【従来の技術】熱転写プリンタ等においては、給紙カセ
ットに収納された用紙(記録紙)を給紙するための給紙
装置を備えている。従来の給紙装置の一例として、本出
願人による先願、特願平3−297955号に記載のも
のがある。この先願に記載のものは、分離爪を備えた給
紙カセットの底部のリフト板を押し上げるリフト板昇降
手段を設け、このリフト板昇降手段によってリフト板を
押し上げると共に、給紙ローラによって用紙を一定距離
逆走することによって1枚目(最上部)の用紙を分離爪
から外し、この後に給紙ローラを正転してその用紙を分
離爪を乗り越えさせて給紙するように構成したものであ
る。
2. Description of the Related Art A thermal transfer printer or the like is equipped with a paper feed device for feeding paper (recording paper) stored in a paper feed cassette. As an example of a conventional paper feeding device, there is one described in a prior application by the present applicant, Japanese Patent Application No. 3-297955. The one described in this prior application is provided with a lift plate elevating means for pushing up a lift plate at the bottom of a sheet feeding cassette provided with a separating claw, the lift plate elevating means is used to push up the lift plate, and a sheet is fed by a sheet feeding roller at a constant distance By reversely running, the first (top) sheet is removed from the separation claw, and then the paper feed roller is rotated in the forward direction so that the sheet can be fed over the separation claw.

【0003】[0003]

【発明が解決しようとする課題】上記先願に記載の従来
の給紙装置においては、給紙カセットを斜め下方に向け
て配置し、用紙の自重に対抗して1枚目の用紙のみ給紙
ローラの摩擦力で逆走して分離するのであるが、用紙ど
うしの摩擦や静電気による密着が原因で、最上部の用紙
と2枚目の用紙が重なって送られる重送が発生してしま
うという問題点があった。この問題点は、給紙カセット
内の最後の2枚を分離しようとする場合や、腰の弱い用
紙の場合に特に起こりやすい。
In the conventional paper feeding apparatus described in the above-mentioned prior application, the paper feeding cassette is arranged diagonally downward and only the first paper is fed against the weight of the paper. The rollers cause the rollers to run in the opposite direction and separate, but due to the friction between the sheets and the close contact due to static electricity, the top sheet and the second sheet overlap each other, causing a double feed. There was a problem. This problem is particularly likely to occur when the last two sheets in the paper feed cassette are to be separated or when the paper is weak.

【0004】本発明はこのような問題点に鑑みなされた
ものであり、給紙カセットに収納された用紙を重送する
ことなく1枚ずつ確実に給紙することができる給紙装置
を提供することを目的とする。
The present invention has been made in view of the above problems, and provides a sheet feeding device capable of reliably feeding the sheets stored in a sheet feeding cassette one by one without double feeding. The purpose is to

【0005】[0005]

【課題を解決するための手段】本発明は、上述した従来
の技術の課題を解決するため、分離爪を備える給紙カセ
ットと、この給紙カセットの底部のリフト板を押し上げ
るリフト板昇降手段と、前記給紙カセットに収納された
最上部の用紙を給紙ローラによって搬送する用紙フィー
ド手段とを備え、前記給紙ローラを一旦逆転させて前記
最上部の用紙を前記分離爪より外し、その後に前記給紙
ローラを正転して前記最上部の用紙を前記給紙カセット
外部へと搬送する給紙装置において、前記リフト板昇降
手段によって前記リフト板を押し上げると共に前記給紙
ローラを前記最上部の用紙に当接させて前記給紙ローラ
を逆転させる際に、前記給紙ローラの給紙方向反対側で
前記最上部の用紙を所定押圧力で押圧して前記最上部の
用紙の逆走を防止する用紙逆走防止手段を設け、前記最
上部の用紙を前記給紙ローラと前記用紙逆走防止手段と
の間で凸状に膨らませて前記最上部の用紙を前記分離爪
より外すよう構成したことを特徴とする給紙装置を提供
するものである。
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a paper feed cassette provided with a separating claw, and lift plate elevating means for pushing up a lift plate at the bottom of the paper feed cassette. A paper feed unit that conveys the uppermost sheet stored in the sheet feeding cassette by a sheet feeding roller, reverses the sheet feeding roller once to remove the uppermost sheet from the separation claw, and then In a sheet feeding device that normally rotates the sheet feeding roller to convey the uppermost sheet to the outside of the sheet feeding cassette, the lift plate lifting unit pushes up the lift plate and moves the sheet feeding roller to the uppermost sheet. When the sheet is brought into contact with the sheet and the sheet feeding roller is reversed, the uppermost sheet is pressed with a predetermined pressing force on the opposite side of the sheet feeding roller in the sheet feeding direction to prevent the sheet of the uppermost sheet from running backward. A sheet reverse running prevention means is provided, and the uppermost sheet is inflated in a convex shape between the paper feed roller and the sheet reverse running prevention means to remove the uppermost sheet from the separation claw. To provide a sheet feeding device.

【0006】[0006]

【実施例】以下、本発明の給紙装置について、添付図面
を参照して説明する。図1は本発明の給紙装置の一実施
例を示す上面平面図、図2及び図3は本発明の給紙装置
の一実施例を示す側面平面図、図4は本発明の給紙装置
の動作を説明するための図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sheet feeding device of the present invention will be described below with reference to the accompanying drawings. 1 is a top plan view showing an embodiment of the paper feeding device of the present invention, FIGS. 2 and 3 are side plan views showing an embodiment of the paper feeding device of the present invention, and FIG. 4 is a paper feeding device of the present invention. 6 is a diagram for explaining the operation of FIG.

【0007】図1〜図3において、本発明の給紙装置1
は、抜き差し自在な給紙カセット2の底部のリフト板3
を押し上げるためのリフト板昇降手段10と、給紙カセ
ット2内の用紙の最上部の1枚を引き出すための用紙フ
ィード手段20と、給紙ローラ29を揺動させるための
給紙ローラ揺動手段30と、給紙カセット2内の用紙の
逆走を防止するための用紙逆走防止手段40とを備えて
概略構成される。以下、これらの手段を個々に詳細に説
明する。
1 to 3, the sheet feeding device 1 of the present invention is shown.
Is a lift plate 3 at the bottom of the paper cassette 2 that can be removed and inserted.
Lift plate elevating means 10 for pushing up the sheet, sheet feeding means 20 for pulling out the uppermost one of the sheets in the sheet feeding cassette 2, and sheet feeding roller swinging means for swinging the sheet feeding roller 29. 30 and a paper reverse running prevention means 40 for preventing reverse running of the paper in the paper feeding cassette 2. Hereinafter, these means will be individually described in detail.

【0008】まず、リフト板昇降手段10は、本体フレ
ーム4,4に回転軸11を掛け渡し、その中央にリフト
アーム12が取り付けられると共に回転軸11の一端を
カム溝付きギヤ13のカム溝14に係合し、ギヤ13は
ギヤ列15を介してモータ16に連結してなる。このモ
ータ16は後述のようにリフトアーム12を回転軸11
を中心として回動させるためのものである。用紙フィー
ド手段20は、本体フレーム4の一方の側に設けられた
フィードモータ21,ベルト22,ギヤ列23,タイミ
ングベルト24の順による伝達力で回動される本体フレ
ーム4に軸支されたギヤ25と、これに歯合する中間ギ
ヤ26と、これに歯合するギヤ27と、このギヤ27に
よって駆動されるロール軸28と、このロール軸28に
取り付けられた給紙ローラ29,29とよりなる。な
お、用紙フィード手段20は後述の給紙ローラ揺動手段
30と協働する。
First, the lift plate elevating / lowering means 10 spans the rotary shafts 11 on the main body frames 4 and 4, the lift arm 12 is attached to the center thereof, and one end of the rotary shaft 11 is attached to the cam groove 14 of the gear 13 with the cam groove. , And the gear 13 is connected to the motor 16 via the gear train 15. The motor 16 rotates the lift arm 12 to the rotary shaft 11 as described later.
It is for rotating about. The sheet feeding means 20 is a gear pivotally supported by the main body frame 4 which is rotated by a transmission force in the order of a feed motor 21, a belt 22, a gear train 23, and a timing belt 24 provided on one side of the main body frame 4. 25, an intermediate gear 26 meshing with this, a gear 27 meshing with this, a roll shaft 28 driven by this gear 27, and paper feed rollers 29, 29 attached to this roll shaft 28. Become. The paper feeding means 20 cooperates with a paper feeding roller swinging means 30 described later.

【0009】さらに、給紙ローラ揺動手段30は、ギヤ
25の支持ピン25aを中心に回動する本体フレーム4
の外側に設けられた一対の支持板31,31と、支持板
31の傾きを検知するセンサ32と、ねじれ剛性を高め
るために一対の支持板31を連結する連結具33とより
なる。この支持板31の一方の側(図1の上側)には、
上記したギヤ26,27が取り付けられており、支持板
31のもう一方の側(図1の下側)の本体フレーム4に
は、センサ32が取り付けられている。また、ロール軸
28は一対の支持板31に取り付けられている。ここ
で、支持板31はギヤ25の支持ピン25aを中心に回
動するので、ギヤ26,27及び給紙ローラ29が取り
付けられたロール軸28は支持板31の回動に伴ってそ
の位置が変位する。従って、給紙ローラ29は後述の如
く揺動することとなる。
Further, the paper feed roller swinging means 30 has a main body frame 4 which rotates around a support pin 25a of the gear 25.
It is composed of a pair of support plates 31, 31 provided on the outer side of the, a sensor 32 for detecting the inclination of the support plate 31, and a connector 33 for connecting the pair of support plates 31 to increase the torsional rigidity. On one side (upper side in FIG. 1) of the support plate 31,
The above-described gears 26 and 27 are attached, and the sensor 32 is attached to the main body frame 4 on the other side of the support plate 31 (lower side in FIG. 1). The roll shaft 28 is attached to the pair of support plates 31. Here, since the support plate 31 rotates about the support pin 25a of the gear 25, the position of the roll shaft 28 to which the gears 26 and 27 and the paper feed roller 29 are attached changes as the support plate 31 rotates. Displace. Therefore, the paper feed roller 29 will swing as described later.

【0010】本発明により新たに加えられた用紙逆走防
止手段40は、一対の本体フレーム4に一対のブラケッ
ト41,41を介して固定されたソレノイド42,42
と、ピン43,43を中心に回動する本体フレーム4の
外側に設けられたアーム44,44と、この一対のアー
ム44を連結するように取り付けられた連結具45と、
これらアーム44と連結具45とに取り付けられたスプ
リング46と、連結具45に取り付けられた用紙押圧部
材47,47とよりなる。
The paper reverse running preventing means 40 newly added by the present invention is a solenoid 42, 42 fixed to a pair of body frames 4 via a pair of brackets 41, 41.
An arm 44, 44 provided on the outer side of the main body frame 4 which rotates around the pins 43, 43, and a connecting member 45 attached so as to connect the pair of arms 44,
A spring 46 attached to the arm 44 and the connecting tool 45, and paper pressing members 47, 47 attached to the connecting tool 45.

【0011】このように構成される本発明の給紙装置1
の動作について説明する。図2,図3に示すように、給
紙カセット2は斜め下方に向けて差し込まれており、給
紙カセット2には複数の用紙Pが収納されている。給紙
指令がなされると、モータ16が始動し、ギヤ13は図
3に示すように時計方向(矢印方向)に回転する。す
ると、リフトアーム12の一端がカム溝14に係合して
いるので、リフトアーム12は回転軸11を中心として
反時計方向(矢印方向)に回動し、給紙カセット2の
底部のリフト板3を押し上げる。この時、用紙Pは給紙
カセット2の下側(給紙方向下流側)両端部に設けられ
た分離爪2aに当接する。
The sheet feeding device 1 of the present invention having such a configuration
The operation of will be described. As shown in FIGS. 2 and 3, the paper feed cassette 2 is inserted obliquely downward, and a plurality of papers P are stored in the paper feed cassette 2. When a paper feed command is issued, the motor 16 is started, and the gear 13 rotates clockwise (arrow direction) as shown in FIG. Then, since one end of the lift arm 12 is engaged with the cam groove 14, the lift arm 12 rotates counterclockwise (in the arrow direction) about the rotation shaft 11 and the lift plate at the bottom of the paper feed cassette 2 is rotated. Push up 3. At this time, the paper P contacts the separation claws 2a provided at both ends of the paper feed cassette 2 below (on the downstream side in the paper feed direction).

【0012】そして、リフトアーム12がリフト板3を
押し上げると、給紙カセット2内の用紙Pも上昇し、最
上部(1枚目)の用紙P1が給紙ローラ29に当接して
給紙ローラ29も押し上げられる。すると、支持板31
が支持ピン25aを中心に反時計方向に回動し、支持板
31が一定の傾きに達した点でセンサ32の検知によて
モータ16が停止する。このように、給紙ローラ29は
リフトアーム12によるリフト板3の押し上げに伴って
その位置が変位して揺動する。これによって、給紙ロー
ラ29は常に最適な状態で最上部の用紙P1に当接す
る。この状態でソレノイド42を始動すると、ソレノイ
ド42がアーム44を図3に示すように引き、連結具4
5が最上部の用紙P1方向に回動して用紙押圧部材47
が用紙Pを押圧する。アーム44と連結具45とにはス
プリング46が取り付けられているので、用紙押圧部材
47は最適な押圧力で用紙Pを押圧する。
When the lift arm 12 pushes up the lift plate 3, the paper P in the paper feed cassette 2 also rises, and the uppermost (first) paper P1 comes into contact with the paper feed roller 29 and the paper feed roller 29. 29 is also pushed up. Then, the support plate 31
Rotates counterclockwise about the support pin 25a, and when the support plate 31 reaches a certain inclination, the motor 16 stops upon detection by the sensor 32. In this way, the position of the paper feed roller 29 is displaced and rocks as the lift plate 3 is pushed up by the lift arm 12. As a result, the paper feed roller 29 always comes into contact with the uppermost sheet P1 in an optimum state. When the solenoid 42 is started in this state, the solenoid 42 pulls the arm 44 as shown in FIG.
5 rotates in the direction of the uppermost sheet P1 to rotate the sheet pressing member 47.
Presses the paper P. Since the spring 46 is attached to the arm 44 and the connecting tool 45, the paper pressing member 47 presses the paper P with an optimum pressing force.

【0013】その後、給紙ローラ29を逆転(給紙方向
とは反対側に回転)させると、最上部の用紙P1は分離
爪2aより外れる。この時、用紙押圧部材47が給紙ロ
ーラ29の上部で最上部の用紙P1を押圧しているの
で、最上部の用紙P1が逆走(給紙方向とは反対側に搬
送)されることはなく、また、最上部の用紙P1は給紙
ローラ29と用紙押圧部材47との間で凸状に膨らんで
分離爪2aより外れることとなる。そして、ソレノイド
42によるアーム44の吸引を解除して用紙押圧部材4
7を用紙Pより離間させ、給紙ローラ29を正転(給紙
方向側に回転)させると、最上部の用紙P1は給紙カセ
ット2より外部へと搬送され、プラテンローラ5とレジ
ストローラ6との間へと搬送されていく。
Thereafter, when the paper feed roller 29 is rotated in the reverse direction (rotated in the direction opposite to the paper feed direction), the uppermost paper P1 is removed from the separation claw 2a. At this time, since the sheet pressing member 47 presses the uppermost sheet P1 above the sheet feeding roller 29, the uppermost sheet P1 is not run backward (conveyed to the side opposite to the sheet feeding direction). In addition, the uppermost sheet P1 bulges in a convex shape between the sheet feeding roller 29 and the sheet pressing member 47 and comes off the separating claw 2a. Then, the suction of the arm 44 by the solenoid 42 is released, and the sheet pressing member 4 is released.
When 7 is separated from the paper P and the paper feed roller 29 is rotated in the normal direction (rotated in the paper feed direction), the uppermost paper P1 is conveyed from the paper feed cassette 2 to the outside, and the platen roller 5 and the registration roller 6 are conveyed. It is transported to and between.

【0014】以上の動作をまとめると、図4に示すよう
になる。なお、図4においては、用紙Pを略水平状態と
して図示している。図4(a)において、最上部の用紙
P1は所定の押圧力で給紙ローラ29に当接している。
この時、最上部の用紙P1の先端は給紙カセット2の分
離爪2aの下面2a1に当接している。
The above operation is summarized as shown in FIG. Note that, in FIG. 4, the paper P is illustrated in a substantially horizontal state. In FIG. 4A, the uppermost sheet P1 is in contact with the sheet feeding roller 29 with a predetermined pressing force.
At this time, the leading edge of the uppermost sheet P1 is in contact with the lower surface 2a1 of the separation claw 2a of the sheet feeding cassette 2.

【0015】そして、図4(b)に示すように、用紙押
圧部材47を給紙ローラ29に対して上流側(給紙方向
とは反対側)で最上部の用紙P1に所定の押圧力で当接
させ、給紙ローラ29を一定角度逆転する。最上部の用
紙P1は給紙ローラ29と用紙押圧部材47との間で図
示のように凸状に膨らみ、結果として最上部の用紙P1
は分離爪2aより外れる。次に、図4(c)に示すよう
に、用紙押圧部材47を用紙Pより離間させ、給紙ロー
ラ29を正転する。すると、最上部の用紙P1は分離爪
2aを乗り越えて前進する。
Then, as shown in FIG. 4B, the paper pressing member 47 is applied to the uppermost paper P1 on the upstream side (opposite to the paper feeding direction) of the paper feeding roller 29 with a predetermined pressing force. The paper feed roller 29 is brought into contact with the paper feed roller 29 and rotated by a predetermined angle. The uppermost sheet P1 bulges in a convex shape as shown in the figure between the sheet feeding roller 29 and the sheet pressing member 47, and as a result, the uppermost sheet P1.
Comes off from the separation claw 2a. Next, as shown in FIG. 4C, the paper pressing member 47 is separated from the paper P, and the paper feeding roller 29 is normally rotated. Then, the uppermost sheet P1 goes over the separation claw 2a and advances.

【0016】なお、以上説明した本実施例においては、
リフトアーム12によってリフト板3を押し上げて最上
部の用紙P1を給紙ローラ29に当接させた後に、ソレ
ノイド42を始動して用紙逆走防止手段40を動作させ
るように構成しているが、この順序を逆にし、まず、ソ
レノイド42を始動して用紙逆走防止手段40を動作さ
せた後に、リフトアーム12によってリフト板3を押し
上げて最上部の用紙P1を給紙ローラ29に当接させる
ように構成しても同様の状態を得ることができる。ま
た、用紙逆走防止手段40を構成する用紙押圧部材47
を回転軸を有するローラとし、内部にワンウェイクラッ
チを設け、このローラを給紙方向のみに回転させるよう
にすれば、用紙押圧部材47を常に最上部の用紙P1に
当接させ、給紙ローラ29を逆転させる時には最上部の
用紙P1を押圧し、給紙ローラ29を正転させる時には
給紙ローラ29と共に最上部の用紙P1を給紙方向側へ
と搬送することが可能となる。従って、ソレノイド42
によって用紙押圧部材47を最上部の用紙P1に対して
押圧・離間させる必要がなくなる。
In the embodiment described above,
Although the lift plate 3 is pushed up by the lift arm 12 to bring the uppermost sheet P1 into contact with the sheet feeding roller 29, the solenoid 42 is started to operate the sheet reverse running preventing means 40. Reverse this order, first, the solenoid 42 is started to operate the sheet reverse running preventing means 40, and then the lift plate 3 is pushed up by the lift arm 12 to bring the uppermost sheet P1 into contact with the sheet feeding roller 29. The same state can be obtained even with such a configuration. Further, the paper pressing member 47 which constitutes the paper reverse running preventing means 40.
Is a roller having a rotating shaft, a one-way clutch is provided inside, and this roller is rotated only in the paper feeding direction, the paper pressing member 47 is always brought into contact with the uppermost paper P1 and the paper feeding roller 29 It is possible to press the uppermost sheet P1 when reversing the sheet, and convey the uppermost sheet P1 together with the sheet feeding roller 29 toward the sheet feeding direction when the sheet feeding roller 29 is rotated forward. Therefore, the solenoid 42
This eliminates the need to press and separate the paper pressing member 47 from the uppermost paper P1.

【0017】さらに、本実施例では給紙カセット2を斜
め下方に向けて配置した構成としているが、用紙Pの自
重とは関係なく用紙Pの剛性を利用する給紙方法である
ので、給紙カセット2の傾斜角度は限定されない。ま
た、用紙Pの剛性に合わせて給紙ローラ29と用紙押圧
部材47との間隔を調整することにより、より信頼性の
高い給紙装置1を提供できる。例えば、腰の弱い用紙P
に対しては給紙ローラ29と用紙押圧部材47との間隔
を狭く、腰の強い用紙Pに対しては給紙ローラ29と用
紙押圧部材47との間隔を広くした方が用紙Pを1枚ず
つ確実に分離することができる。
Further, in the present embodiment, the paper feed cassette 2 is arranged diagonally downward, but since the paper feed method uses the rigidity of the paper P regardless of the weight of the paper P, the paper feed is performed. The inclination angle of the cassette 2 is not limited. Further, by adjusting the distance between the paper feed roller 29 and the paper pressing member 47 according to the rigidity of the paper P, it is possible to provide the paper feed device 1 with higher reliability. For example, paper P with a weak waist
For a sheet of paper P having a tight stiffness, a sheet of paper P having a large gap between the sheet feed roller 29 and the sheet of paper pushing member 47 is used. It can be surely separated.

【0018】[0018]

【発明の効果】以上詳細に説明したように、本発明の給
紙装置は、リフト板昇降手段によってリフト板を押し上
げると共に給紙ローラを最上部の用紙に当接させて給紙
ローラを逆転させる際に、給紙ローラの給紙方向反対側
で最上部の用紙を所定押圧力で押圧して最上部の用紙の
逆走を防止する用紙逆走防止手段を設け、最上部の用紙
を給紙ローラと用紙逆走防止手段との間で凸状に膨らま
せて最上部の用紙を分離爪より外すよう構成したので、
給紙カセットに収納された用紙を重送することなく1枚
ずつ確実に給紙することができる。
As described above in detail, in the paper feeding apparatus of the present invention, the lift plate is raised by the lift plate lifting means and the paper feeding roller is brought into contact with the uppermost paper to reverse the paper feeding roller. At this time, the topmost sheet is fed by pressing the topmost sheet with a predetermined pressing force on the opposite side of the sheet feeding roller to prevent the topmost sheet from running backward. Since it is configured to inflate in a convex shape between the roller and the paper reverse running prevention means and remove the uppermost paper from the separation claw,
The sheets stored in the sheet feeding cassette can be reliably fed one by one without double feeding.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示す上面平面図である。FIG. 1 is a top plan view showing an embodiment of the present invention.

【図2】本発明の一実施例を示す側面平面図である。FIG. 2 is a side plan view showing an embodiment of the present invention.

【図3】本発明の一実施例を示す側面平面図である。FIG. 3 is a side plan view showing an embodiment of the present invention.

【図4】本発明の動作を説明するための図である。FIG. 4 is a diagram for explaining the operation of the present invention.

【符号の説明】[Explanation of symbols]

1 給紙装置 2 給紙カセット 2a 分離爪 3 リフト板 10 リフト板昇降手段 20 用紙フィード手段 29 給紙ローラ 30 給紙ローラ揺動手段 40 用紙逆走防止手段 47 用紙押圧部材 P 用紙 P1 最上部の用紙 1 Paper Feeding Device 2 Paper Feeding Cassette 2a Separation Claw 3 Lifting Plate 10 Lifting Plate Lifting Means 20 Paper Feeding Means 29 Paper Feeding Rollers 30 Paper Feeding Roller Shaking Means 40 Paper Backward Travel Preventing Means 47 Paper Pressing Members P Paper P1 Topmost Paper

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】分離爪を備える給紙カセットと、この給紙
カセットの底部のリフト板を押し上げるリフト板昇降手
段と、前記給紙カセットに収納された最上部の用紙を給
紙ローラによって搬送する用紙フィード手段とを備え、 前記給紙ローラを一旦逆転させて前記最上部の用紙を前
記分離爪より外し、その後に前記給紙ローラを正転して
前記最上部の用紙を前記給紙カセット外部へと搬送する
給紙装置において、 前記リフト板昇降手段によって前記リフト板を押し上げ
ると共に前記給紙ローラを前記最上部の用紙に当接させ
て前記給紙ローラを逆転させる際に、前記給紙ローラの
給紙方向反対側で前記最上部の用紙を所定押圧力で押圧
して前記最上部の用紙の逆走を防止する用紙逆走防止手
段を設け、 前記最上部の用紙を前記給紙ローラと前記用紙逆走防止
手段との間で凸状に膨らませて前記最上部の用紙を前記
分離爪より外すよう構成したことを特徴とする給紙装
置。
1. A paper feed cassette provided with a separating claw, a lift plate elevating means for pushing up a lift plate at the bottom of the paper feed cassette, and the uppermost paper stored in the paper feed cassette is conveyed by a paper feed roller. Paper feed means, and the paper feed roller is once reversed to remove the uppermost paper from the separation claw, and then the paper feed roller is normally rotated to move the uppermost paper to the outside of the paper feed cassette. In the sheet feeding device for transporting the sheet to the sheet feeding roller, when the lift plate is pushed up by the lift plate lifting means and the sheet feeding roller is brought into contact with the uppermost sheet to reverse the sheet feeding roller, A paper reverse running prevention unit is provided on the opposite side of the paper feeding direction to press the uppermost paper sheet with a predetermined pressing force to prevent the uppermost paper sheet from running backward. Previous Sheet feeding apparatus, wherein a sheet of the uppermost inflatable convexly configured to disengage from the separation claw with the sheet reverse run preventing means.
JP5818694A 1994-03-02 1994-03-02 Paper feeding device Pending JPH07237763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5818694A JPH07237763A (en) 1994-03-02 1994-03-02 Paper feeding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5818694A JPH07237763A (en) 1994-03-02 1994-03-02 Paper feeding device

Publications (1)

Publication Number Publication Date
JPH07237763A true JPH07237763A (en) 1995-09-12

Family

ID=13076994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5818694A Pending JPH07237763A (en) 1994-03-02 1994-03-02 Paper feeding device

Country Status (1)

Country Link
JP (1) JPH07237763A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012096902A (en) * 2010-11-02 2012-05-24 Canon Inc Sheet feeding apparatus and image forming apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012096902A (en) * 2010-11-02 2012-05-24 Canon Inc Sheet feeding apparatus and image forming apparatus

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