JP4246135B2 - Paper feed tray and image forming apparatus - Google Patents

Paper feed tray and image forming apparatus Download PDF

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JP4246135B2
JP4246135B2 JP2004296804A JP2004296804A JP4246135B2 JP 4246135 B2 JP4246135 B2 JP 4246135B2 JP 2004296804 A JP2004296804 A JP 2004296804A JP 2004296804 A JP2004296804 A JP 2004296804A JP 4246135 B2 JP4246135 B2 JP 4246135B2
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sheet
plate
feed tray
paper feed
image forming
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JP2006103949A (en
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良 竹中
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株式会社リコー
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本発明は、複写機、プリンタ、ファクシミリ、印刷機あるいはこれらの複合機等の画像形成装置等に用いられるシ−ト材供給装置に関する。   The present invention relates to a sheet material supply apparatus used for an image forming apparatus such as a copying machine, a printer, a facsimile machine, a printing machine, or a complex machine thereof.
一般にシート材供給装置は、回動可能に構成された底板または上下動可能な底板上にシート材を積載し、底板の上昇によりシート材最上面を給紙コロに当接させ、給紙コロの搬送力により最上部のシート材から一枚ずつ送り出して、給紙トレイ内から画像形成装置内へとシート材を搬送する構造となっている。
斯かる給紙トレイに、封筒・薬袋等の袋状のシート材が積載され、この袋状のシート材を一枚ずつ給紙して画像形成部にて画像形成を行うことがあるが、封筒・薬袋等のシート材は底部が糊付けされて袋状になっており、糊付けされた袋の底部分は糊付けされていない入り口部分と厚みが異なり、多数枚積載すると袋の底部と入り口部とで高さの異なるシート材ブロックになってしまう。このように積載されたシート材ブロックの高さが搬送方向に向かって左右で均等でない場合、シート材にかかる搬送負荷に偏りが生じ、スキュー・耳折れ・不送り等の給紙不良が発生する。
従来は、特許文献1及び2に示すように、用紙積載量を少量に制限して積載されたシート材ブロックの高低差を少なく抑えることや、シート材の積載方向を限定することでブロックの高さが搬送方向に対して左右で偏らないようにすることなどを、上記不具合を防ぐ施策としていた。
特開平9−175677号公報 特開平5−229699号公報
In general, a sheet material supply apparatus is configured such that a sheet material is stacked on a bottom plate that can be rotated or a bottom plate that can be moved up and down. The sheet material is fed one by one from the uppermost sheet material by the conveying force and conveyed from the sheet feed tray to the image forming apparatus.
In such a paper feed tray, bag-shaped sheet materials such as envelopes and medicine bags are stacked, and this bag-shaped sheet material may be fed one by one to form an image in the image forming unit.・ Sheet materials such as medicine bags have a bag shape with the bottom part glued, and the bottom part of the glued bag has a different thickness from the entrance part that is not glued. It becomes a sheet material block with different height. If the heights of the stacked sheet material blocks are not uniform on the left and right sides in the conveyance direction, the conveyance load applied to the sheet material is biased, resulting in paper feed defects such as skew, folds, and unfeeds. .
Conventionally, as shown in Patent Documents 1 and 2, the height of the block is reduced by limiting the sheet stacking amount by limiting the sheet stacking amount to a small amount, or by limiting the stacking direction of the sheet material. As a measure to prevent the above-mentioned problems, it has been ensured that there is no bias on the left and right with respect to the conveyance direction.
Japanese Patent Laid-Open No. 9-175777 JP-A-5-229699
しかしながら、従来技術にあっては、ユーザーの使用法を制限するという問題があるうえに、シート材を補給する回数が多くなり利便性が落ちること、また一枚あたりのシート搬送時間が長くなるので画像形成の生産性が落ちるなどの問題があった。
本発明は、上述した実情を考慮してなされたもので、封筒・薬袋等の袋状のシート材を画像形成装置内へとスムーズに搬送することを可能にし、積載したシート材ブロックの高低差に起因するスキュー、耳折れ、不送り等の給紙不具合の発生を防ぐことを可能にしたシ−ト材供給装置を提供することを目的とする。
However, in the conventional technology, there is a problem that the usage of the user is limited, and the number of times the sheet material is replenished is increased, so that convenience is reduced, and the sheet conveyance time per sheet is increased. There was a problem that productivity of image formation was lowered.
The present invention has been made in consideration of the above-described circumstances, and enables a bag-like sheet material such as an envelope and a medicine bag to be smoothly conveyed into an image forming apparatus, and the height difference of the stacked sheet material blocks. It is an object of the present invention to provide a sheet material supply device that can prevent the occurrence of paper feed defects such as skew, bent ears, and non-feed due to the above.
上記の課題を解決するために、請求項1に記載の発明は、シート材の搬送方向の左右両側に配置され、前記シート材のサイズに応じて前記シート材の幅方向に移動可能な一対のサイドフェンスと、前記シート材の搬送方向の左右両側に前記サイドフェンスが入り込む切り欠きを有し、前記シート材を積層する上下動可能な底板と、を備えた給紙トレイにおいて、前記底板に設けた前記切り欠きより下流側で前記シート材の搬送方向左右の何れか一方に底上げ部材を設けたことを特徴とする。
請求項2の発明は、請求項1記載の給紙トレイであって、前記底上げ部材の高さを調整可能としたことを特徴とする。
請求項3の発明は、請求項1記載の給紙トレイであって、前記底上げ部材は、前記底板に対して着脱可能に構成されていることを特徴とする。
請求項4発明は、請求項1乃至3いずれか一項載の給紙トレイを備えた画像形成装置を最も主要な特徴とする。
In order to solve the above-described problem, the invention according to claim 1 is a pair of sheets that are arranged on the left and right sides in the sheet material conveyance direction and are movable in the width direction of the sheet material according to the size of the sheet material. and side fences have lacked the side fences enters cut on the left and right sides of the conveying direction of the sheet material, and vertically movable bottom plate for laminating the sheet material, the sheet feed tray having a provided on the bottom plate Further, a bottom raising member is provided on either the left or right side in the conveying direction of the sheet material on the downstream side of the notch .
A second aspect of the present invention is the paper feed tray according to the first aspect, wherein the height of the bottom raising member is adjustable.
A third aspect of the present invention is the paper feed tray according to the first aspect , wherein the bottom raising member is configured to be detachable from the bottom plate.
A fourth aspect of the present invention, the most important feature image forming apparatus having a paper feed tray of claims 1 to 3 any one SL placement.
本発明の給紙トレイによれば、底板に設けた切り欠きより下流側でシート材の搬送方向左右の何れか一方に底上げ部材を設けたことにより、積載時に搬送方向に対して左右で高さが異なるシート材の高低差を打ち消し、給紙トレイ内から画像形成部内へと搬送される際、搬送負荷の左右差が生じてスキュー・不送り等の給紙不具合が発生することを防ぐことができる。
本発明の給紙トレイによれば、底上げ部材を高さ方向に可動な構造にすることにより、積載するシート材の種類や大きさに応じた最適な底上げ高さを得ることを可能にし、搬送時の負荷偏差に起因するスキュー・不送り等の給紙不具合を防ぐことができる。
本発明の給紙トレイによれば、底上げ部材を底板本体に対して着脱可能な構造にすることにより、積載するシート材の種類や大きさに応じた最適な底上げ高さを得ることを可能にし、搬送時の負荷偏差に起因するスキュー・不送り等の給紙不具合を防ぐことができる。
According to the sheet feeding tray of the present invention, the bottom raising member is provided on either the left or right side in the sheet conveyance direction on the downstream side of the notch provided in the bottom plate, so that the height of the sheet material on the left and right with respect to the conveyance direction during stacking is increased. This eliminates the difference in height of different sheet materials and prevents paper feeding problems such as skew and non-feeding due to differences in the left and right transport loads when transported from the paper feed tray to the image forming unit. it can.
According to the paper feed tray of the present invention, by making the bottom raising member movable in the height direction, it is possible to obtain an optimum bottom raising height according to the type and size of the sheet material to be stacked. It is possible to prevent paper feeding problems such as skew and non-feed due to load deviation at the time.
According to the paper feed tray of the present invention, the bottom raising member is detachable from the bottom plate body, so that it is possible to obtain an optimum bottom raising height according to the type and size of the sheet material to be stacked. In addition, it is possible to prevent paper feeding problems such as skew and non-feed due to load deviation during conveyance.
以下、図面を参照して、本発明の実施形態を詳細に説明する。図1は、本発明に係る給紙トレイ概略図である
図1に示すような本実施形態の給紙トレイ1は、複写機、FAX、プリンタ等の画像形成装置(読取光学系、書き込み光学系、画像形成部、給紙部、排紙部等からなる)の給紙部に付設され、画像形成部に設けた転写位置に向けて給紙されるシート材Pを積載収容する。給紙トレイ1は、収容されるシート材Pの幅方向両側に位置され且つシート材Pのサイズに応じてシート材Pの幅方向に移動可能な一対のサイドフェンス3と、用紙送り方向後端部にシート材端面を搬送方向に押圧するエンドフェンス4と、シート材Pを繰り出し可能な給紙位置に押し上げて保持する底板2とを有している。
図2は、底板及び底板上昇機構の概略図であり、底板を回動して起伏させる駆動機構が示されている。この駆動機構は、画像形成装置の本体に設けられたモータと、このモータに連結された駆動軸と、駆動軸の端部に一体に取り付けられ底板の底部に配置された回動アーム5によって構成されている。この構成では、給紙トレイが画像形成装置の本体にセットされると、モータが駆動され、これに伴って駆動軸が回転して、駆動軸と一体で回動する回動アーム5が回転し、回動アーム5に設けた押し上げ片5aが底板2を押し上げることにより底板を回動支点2aを中心として回動起上させる。この動作に伴い、底板上に載置されたシート材Pは繰り出し可能な給紙位置まで押し上げられて保持(待機)される。
図3は、シート材分離機構の側面図であり、積載されたシート材Pを一枚ずつ分離して給紙する給紙機構が示されている。この給紙機構は、底板の上昇により転写紙Pの最上面に当接している呼び出しコロ(ピックアップローラー)6と、互いに対向する給紙コロ(フィードローラー)7および逆転コロ(リバースローラー)8によって構成されている。操作部からの操作、或いはホストマシンからの信号により印刷命令が画像形成装置に入力されると、給紙信号により給紙コロ7と呼び出しコロ6とが回転駆動される。逆転コロ8は、トルクリミッタを介して反給紙方向に回転駆動される。最上面のシート材Pは当接した呼び出しコロ6の回転により繰り出され、給紙コロ7と逆転コロ8のニップ部に送り込まれる。繰り出されたシート材が1枚だけでニップ部に送りこまれた時には、逆転コロのトルクリミッタは滑り給紙コロにより搬送されるシート材Pの搬送を妨げず、シート材Pはそのまま画像形成装置本体内へ搬送される。繰り出された転写紙が2枚以上重なってニップ部に送り込まれた場合は、逆転コロのトルクリミッタが滑らず、反転方向にコロが回転されるので給紙コロに当接している一枚を除いた他のシート材は反転方向に搬送されて、一枚のシート材のみが画像形成装置本体内へ搬送される。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a paper feed tray according to the present invention. A paper feed tray 1 according to this embodiment as shown in FIG. 1 is an image forming apparatus (reading optical system, writing optical system) such as a copying machine, a FAX, or a printer. The sheet material P is attached to a sheet feeding unit of an image forming unit, a sheet feeding unit, a sheet discharge unit, and the like, and stacks and accommodates sheet materials P fed toward a transfer position provided in the image forming unit. The paper feed tray 1 includes a pair of side fences 3 that are located on both sides in the width direction of the sheet material P to be accommodated and are movable in the width direction of the sheet material P according to the size of the sheet material P, and a rear end portion in the paper feed direction And an end fence 4 that presses the end face of the sheet material in the conveying direction, and a bottom plate 2 that pushes up and holds the sheet material P to a feed position where the sheet material P can be fed out.
FIG. 2 is a schematic diagram of the bottom plate and the bottom plate raising mechanism, and shows a drive mechanism that turns the bottom plate up and down. The drive mechanism includes a motor provided in the main body of the image forming apparatus, a drive shaft connected to the motor, and a rotating arm 5 that is integrally attached to the end of the drive shaft and disposed at the bottom of the bottom plate. Has been. In this configuration, when the paper feed tray is set in the main body of the image forming apparatus, the motor is driven, and the drive shaft rotates accordingly, and the rotating arm 5 that rotates integrally with the drive shaft rotates. The push-up piece 5a provided on the turning arm 5 pushes up the bottom plate 2 to cause the bottom plate to turn up around the turning fulcrum 2a. Along with this operation, the sheet material P placed on the bottom plate is pushed up to a feed position where it can be fed out and held (standby).
FIG. 3 is a side view of the sheet material separating mechanism, showing a sheet feeding mechanism that separates and feeds the stacked sheet materials P one by one. This paper feeding mechanism is composed of a calling roller (pickup roller) 6 that is in contact with the uppermost surface of the transfer paper P by raising the bottom plate, a paper feeding roller (feed roller) 7 and a reverse roller (reverse roller) 8 that face each other. It is configured. When a print command is input to the image forming apparatus by an operation from the operation unit or a signal from the host machine, the paper feeding roller 7 and the calling roller 6 are rotationally driven by the paper feeding signal. The reversing roller 8 is driven to rotate in the counter-feeding direction via a torque limiter. The uppermost sheet material P is fed out by the rotation of the calling roller 6 in contact with the sheet material P, and is fed into the nip portion between the sheet feeding roller 7 and the reverse rotation roller 8. When only one sheet material is fed into the nip portion, the reverse roller torque limiter does not interfere with the conveyance of the sheet material P conveyed by the sliding paper feeding roller, and the sheet material P remains as it is. It is conveyed in. When two or more of the transferred transfer sheets are overlapped and fed into the nip part, the torque limiter of the reverse roller does not slip and the roller rotates in the reverse direction. The other sheet material is conveyed in the reverse direction, and only one sheet material is conveyed into the image forming apparatus main body.
図4は、高低差を設けた底板の概略図である。搬送方向に対して左右で高低差を設けたトレイ底板を示す。トレイ底板を、搬送方向に対して左右どちらか一方(図中ではトレイ奥側)の一部2Aを他方2Bよりも底上げして、数mmの高低差を設けた構造とする。これにより、積載されたシート材のブロックが搬送方向に対して左右で高低差がある場合にも、シート材搬送過程において搬送負荷偏差を低減することが可能となる。つまり、シート材束の左右いずれか低い方を、高い方の部分2A上にセットするようにすれば、高低差を緩和できる。
これによれば、搬送方向に対して左右のどちらか一方の底板の一部または全面を底上げして高低差を設けることにより、積載時に搬送方向に対して左右で高さが異なるシート材の高低差を打ち消し、給紙トレイ内から画像形成部内へと搬送される際、搬送負荷の左右差が生じてスキュー・不送り等の給紙不具合が発生することを防ぐことができる。
図5は、高さ方向に可動な高低差を設けた底板の概略図である。底板上の、搬送方向に対して左右どちらか一方に、ネジ機構9により上下動する部分2Cを数箇所設ける。これにより使用するシート材に応じて最適な高低差に設定することが可能となる。
これによれば、底上げする部分を高さ方向に可動な構造にすることにより、積載するシート材の種類や大きさに応じた最適な底上げ高さを得ることを可能にし、搬送時の負荷偏差に起因するスキュー・不送り等の給紙不具合を防ぐことができる。
図6は、着脱可能な高低差を設けた底板を示す図である。高さ数mmの板状の底上げ部材10を底板上にシール等で接着する。底上げ部材10は付替え可能なので、使用するシート材に応じて最適な高低差に設定することが可能となる。
この給紙トレイによれば、底上げする部分を底板本体に対して着脱可能な構造にすることにより、積載するシート材の種類や大きさに応じた最適な底上げ高さを得ることを可能にし、搬送時の負荷偏差に起因するスキュー・不送り等の給紙不具合を防ぐことができる。
FIG. 4 is a schematic view of a bottom plate provided with a height difference. The tray bottom board which provided the height difference in right and left with respect to the conveyance direction is shown. The tray bottom plate has a structure in which a height difference of several millimeters is provided by raising a part 2A on either the left or right side (in the drawing, the back side of the tray) of the tray with respect to the conveyance direction. This makes it possible to reduce the conveyance load deviation in the sheet material conveyance process even when the stacked sheet material blocks have a difference in height from left to right with respect to the conveyance direction. That is, if the left or right side of the sheet material bundle is set lower on the higher portion 2A, the height difference can be reduced.
According to this, by raising a part or the entire surface of either one of the left and right bottom plates with respect to the conveyance direction to provide a height difference, the height of the sheet material having a different height on the left and right with respect to the conveyance direction when stacked. When the difference is canceled and the sheet is transported from the sheet feed tray to the image forming unit, it is possible to prevent a sheet feeding failure such as skew or non-feed due to a difference in the left and right transport load.
FIG. 5 is a schematic view of a bottom plate provided with a height difference movable in the height direction. Several portions 2 </ b> C that are moved up and down by the screw mechanism 9 are provided on either the left or right of the conveying direction on the bottom plate. Accordingly, it is possible to set an optimum height difference according to the sheet material to be used.
According to this, it is possible to obtain the optimum height for raising according to the type and size of the sheet material to be loaded by making the structure where the bottom is raised movable in the height direction, and the load deviation during conveyance It is possible to prevent paper feed defects such as skew and non-feed due to the paper.
FIG. 6 is a view showing a bottom plate provided with a detachable height difference. A plate-like bottom raising member 10 having a height of several mm is bonded on the bottom plate with a seal or the like. Since the bottom raising member 10 can be replaced, it is possible to set the optimum height difference according to the sheet material to be used.
According to this paper feed tray, it is possible to obtain the optimum bottom height according to the type and size of the sheet material to be stacked by making the bottom raised portion detachable from the bottom plate body, It is possible to prevent paper feeding problems such as skew and non-feed due to load deviation during conveyance.
本発明に係る給紙トレイの概略図。1 is a schematic view of a paper feed tray according to the present invention. 底板及び底板上昇機構の概略図。Schematic of a bottom plate and a bottom plate raising mechanism. シート材分離機構の側面図。The side view of a sheet material separation mechanism. 高低差を設けた底板の概略図。Schematic of the baseplate which provided the elevation difference. 高さ方向に可動な高低差を設けた底板の概略図。Schematic of the baseplate which provided the height difference movable in a height direction. 着脱可能な高低差を設けた底板の概略図。Schematic of the baseplate which provided the height difference which can be attached or detached.
符号の説明Explanation of symbols
P シート材
1 給紙トレイ本体
2 底板
3 前側サイドフェンス
4 後側サイドフェンス
5 回動アーム
6 呼び出しコロ
7 給紙コロ
8 逆転コロ
9 ネジ式底上げ部材
10 着脱式底上げ部材
P sheet material 1 sheet feeding tray body 2 bottom plate 3 front side fence 4 rear side fence 5 rotating arm 6 calling roller 7 sheet feeding roller 8 reverse roller 9 screw type bottom raising member 10 detachable bottom raising member

Claims (4)

  1. シート材の搬送方向の左右両側に配置され、前記シート材のサイズに応じて前記シート材の幅方向に移動可能な一対のサイドフェンスと、前記シート材の搬送方向の左右両側に前記サイドフェンスが入り込む切り欠きを有し、前記シート材を積層する上下動可能な底板と、を備えた給紙トレイにおいて、
    前記底板に設けた前記切り欠きより下流側で前記シート材の搬送方向左右の何れか一方に底上げ部材を設けたことを特徴とする給紙トレイ。
    A pair of side fences that are arranged on the left and right sides of the sheet material in the conveyance direction and are movable in the width direction of the sheet material according to the size of the sheet material, and the side fences on the left and right sides in the conveyance direction of the sheet material has a notch enters a vertically movable bottom plate for laminating the sheet material, the sheet feed tray having a
    A sheet feed tray, wherein a bottom raising member is provided on either the left or right side of the sheet material in the conveyance direction downstream of the notch provided on the bottom plate .
  2. 請求項1記載の給紙トレイであって、前記底上げ部材の高さを調整可能としたことを特徴とする給紙トレイ。 2. The paper feed tray according to claim 1, wherein a height of the bottom raising member is adjustable.
  3. 請求項1記載の給紙トレイであって、前記底上げ部材は、前記底板に対して着脱可能に構成されていることを特徴とする給紙トレイ。 2. The paper feed tray according to claim 1 , wherein the bottom raising member is configured to be detachable from the bottom plate.
  4. 請求項1乃至3いずれか一項載の給紙トレイを備えたことを特徴とする画像形成装置。 An image forming apparatus comprising the paper feed tray of claims 1 to 3 any one SL placement.
JP2004296804A 2004-10-08 2004-10-08 Paper feed tray and image forming apparatus Expired - Fee Related JP4246135B2 (en)

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JP4877512B2 (en) * 2007-03-13 2012-02-15 富士ゼロックス株式会社 Mounting member for sheet storage device, sheet storage device, and image forming apparatus
JP2009007081A (en) * 2007-06-26 2009-01-15 Ricoh Co Ltd Recording medium storage device and image forming device
JP6355393B2 (en) 2014-04-04 2018-07-11 キヤノン株式会社 Sheet feeding apparatus and image forming apparatus
JP6819922B2 (en) 2016-06-02 2021-01-27 株式会社リコー Mounting member for sheet material feeding device, image forming device and sheet material feeding device

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