JPH05246555A - Table elevating device for paper hopper - Google Patents
Table elevating device for paper hopperInfo
- Publication number
- JPH05246555A JPH05246555A JP4051418A JP5141892A JPH05246555A JP H05246555 A JPH05246555 A JP H05246555A JP 4051418 A JP4051418 A JP 4051418A JP 5141892 A JP5141892 A JP 5141892A JP H05246555 A JPH05246555 A JP H05246555A
- Authority
- JP
- Japan
- Prior art keywords
- paper
- clutch
- fixed
- rotary shaft
- hopper
- 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
Links
Landscapes
- Paper Feeding For Electrophotography (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電子写真装置等に用紙
を供給する用紙ホッパのテーブル昇降装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table lifting device for a paper hopper that supplies paper to an electrophotographic device or the like.
【０００２】近年、電子写真装置における印字処理の高
速化に伴って、この電子写真装置に用紙を供給する用紙
ホッパの大容量化が要求されている。しかしながら、こ
の電子写真装置に付設されている、例えばカセット式の
用紙ホッパの容量は、該電子写真装置の大きさにより制
限されるため、一般に電子写真装置に分離型の用紙ホッ
パを増設することがなされている。In recent years, with the increase in the speed of printing processing in an electrophotographic apparatus, it has been required to increase the capacity of a paper hopper that supplies paper to the electrophotographic apparatus. However, since the capacity of, for example, a cassette type paper hopper attached to this electrophotographic apparatus is limited by the size of the electrophotographic apparatus, it is generally possible to add a separate type paper hopper to the electrophotographic apparatus. Has been done.
【０００３】[0003]
【従来の技術】本発明の従来例として特願平3-297108号
にかかる「用紙ホッパのテーブル昇降装置」の発明が知
られている。2. Description of the Related Art As a conventional example of the present invention, an invention of a "paper hopper table lifting device" according to Japanese Patent Application No. 3-297108 is known.
【０００４】図５は従来の用紙ホッパのテーブル昇降装
置の原理を示す斜視図である。なお、構成，動作の説明
を理解し易くするために全図を通じて同一部分には同一
符号を付してその重複説明を省略する。図において、１
は用紙６を積載するためのテーブル（給紙台）、２は弾
性部材（例えば引張りコイルばね）であって、用紙６を
積載しているテーブル１を懸吊すると共に常に昇動方向
に付勢保持する機能を有し、少なくとも１つで構成す
る。FIG. 5 is a perspective view showing the principle of a conventional table lifting device for a paper hopper. In addition, in order to make the description of the configuration and operation easy to understand, the same reference numerals are given to the same portions throughout the drawings, and the duplicated description thereof will be omitted. In the figure, 1
Is a table (feeding table) for stacking the paper 6 and 2 is an elastic member (for example, a tension coil spring) for suspending the table 1 on which the paper 6 is stacked and constantly urging in the ascending direction. It has a function of holding and is composed of at least one.
【０００５】3a，3bは定滑車であって、テーブル１の左
右両側面と対向する図示しない壁面の上方および下方に
少なくとも２対づつ固設されている。4a，4bはテーブル
１を上下に駆動するワイヤロープであって、前記各側面
における定滑車3a，3bのそれぞれに独立して８の字に巻
き掛けられて、テーブル１の各側面の両端部に固定され
ている。Reference numerals 3a and 3b denote fixed pulleys, and at least two pairs of fixed pulleys are fixedly provided above and below a wall surface (not shown) facing the left and right side surfaces of the table 1. 4a and 4b are wire ropes that drive the table 1 up and down, and are individually wound around the constant pulleys 3a and 3b on the respective side faces in a figure of 8 to be attached to both ends of each side face of the table 1. It is fixed.
【０００６】このテーブル昇降装置は、テーブル１が弾
性部材２により懸吊されると共に、常に昇動方向に付勢
保持される。また、このテーブル１の左右両側面と対向
する図示しない壁面の上方および下方に少なくとも２対
づつ配設される定滑車3a，3bと、テーブル１の各側面側
における定滑車3a，3bのそれぞれに８の字に巻き掛けら
れてテーブル１の各側面の両端部に固着されるワイヤロ
ープ4a，4bとにより、このテーブル１が常に水平状態に
保持されている。In this table lifting device, the table 1 is suspended by the elastic member 2 and is always biased and held in the ascending direction. Further, at least two pairs of fixed pulleys 3a and 3b are arranged above and below a wall surface (not shown) facing the left and right side surfaces of the table 1, and the fixed pulleys 3a and 3b on the side surfaces of the table 1 are arranged respectively. The table 1 is always held in a horizontal state by the wire ropes 4a and 4b wound around the figure 8 and fixed to both ends of each side surface of the table 1.
【０００７】このように構成された用紙ホッパのテーブ
ル昇降装置における用紙ホッパは、用紙６がテーブル１
上に載置されると、このテーブル１が用紙６の自重によ
り押し下げられる。また、テーブル１は弾性部材２によ
り常に昇動方向に付勢保持されているため、このテーブ
ル１に載置されている用紙６の最上位部用紙表面は、用
紙ホッパの上方側に付勢されて用紙分離機構（用紙繰り
出しローラ）５に当接する。In the paper hopper in the table lifting device of the paper hopper thus configured, the paper 6 is placed on the table 1
When placed on top, the table 1 is pushed down by the weight of the sheet 6. Further, since the table 1 is always biased and held in the ascending direction by the elastic member 2, the uppermost sheet surface of the sheet 6 placed on the table 1 is biased to the upper side of the sheet hopper. And contacts the sheet separating mechanism (sheet feeding roller) 5.
【０００８】なお、一対の定滑車3a，3bの回転軸には、
それぞれ図示しない一方向クラッチ付ギアが付設され、
この一方向クラッチ付ギアには図示しない緩衝部材が配
設されて、テーブル１の下降方向にはアンロック状態で
作用し、上昇方向には急激な上昇を抑制する機能が設け
られているが、本発明とは関係がないので説明は省略す
る。The rotary shafts of the pair of constant pulleys 3a and 3b are
Gears with one-way clutch (not shown) are attached,
A buffer member (not shown) is provided in the gear with one-way clutch, and is provided with a function of acting in an unlocked state in the descending direction of the table 1 and suppressing a sudden rise in the ascending direction. Since it has nothing to do with the present invention, its explanation is omitted.
【０００９】[0009]
【発明が解決しようとする課題】用紙ホッパが常に安定
した用紙分離機能を得るためには、テーブル１上の用紙
６の最上位部用紙表面を用紙分離機構５に対して平行
に、均一な荷重で押圧しなければならない。従来の方式
は、テーブル１の左右に弾性手段による上昇／下降機能
をそれぞれ独立して設けているため、安定した用紙分離
機能を得ることができ、矢印Ｅ方向に用紙６を順次繰り
出す。In order for the paper hopper to always obtain a stable paper separating function, the uppermost paper surface of the paper 6 on the table 1 is parallel to the paper separating mechanism 5 and a uniform load is applied. Must be pressed with. In the conventional method, since the raising / lowering function by the elastic means is independently provided on the left and right sides of the table 1, a stable sheet separating function can be obtained, and the sheet 6 is sequentially fed out in the arrow E direction.
【００１０】しかしながら、用紙補給時等にオペレータ
が手動操作でテーブル１を押し下げようとした場合、テ
ーブル１の上昇／下降機構が左右独立しているためにテ
ーブル面は不安定に傾き用紙補給作業に支障をきたす問
題点がある。However, when the operator manually pushes down the table 1 when replenishing the sheet, the table surface is unstable because the left / right moving mechanism of the table 1 is independent of the left / right mechanism. There is a problem that causes trouble.
【００１１】この問題点はテーブル１の左右に独立して
設けている上昇／下降機構の一対の定滑車3a，3bに軸を
通して左右の定滑車3a，3bの回転を同期させてやればテ
ーブル１の端部を押下げてもテーブル１は平行に下降す
るが、この方式では左右が独立していないために、用紙
分離機構５に対して常に均等圧力で押圧することは困難
となる別の問題点が発生する。The problem is that if the rotations of the left and right constant pulleys 3a and 3b are synchronized with each other by passing the pair of constant pulleys 3a and 3b of the ascending / descending mechanism independently provided on the left and right sides of the table 1 through a shaft. Although the table 1 descends in parallel even if the end portion of the sheet is pushed down, in this method, since the left and right are not independent, it is difficult to always press the sheet separating mechanism 5 with a uniform pressure. Dots occur.
【００１２】本発明は上記従来の問題点に鑑みてなされ
たもので、用紙セット時のテーブルの急激な下降に際し
てもテーブル面を略水平に保持し、且つ用紙給紙時のテ
ーブル面を用紙分離手段に対して常に平行に押圧可能な
用紙ホッパのテーブル昇降装置の提供を目的とする。The present invention has been made in view of the above problems of the prior art. The table surface is held substantially horizontal even when the table is rapidly lowered when the paper is set, and the table surface is separated when the paper is fed. An object of the present invention is to provide a table lifting device for a paper hopper that can always be pressed in parallel with the means.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成するため
に図１に示すように、用紙６が積載されるテーブル１を
懸吊すると共に常に昇動方向へ付勢する少なくとも一つ
の弾性部材２と、前記テーブル１の左右両側面と対向す
る左右の側壁の上方および下方に少なくとも２対ずつ固
設された定滑車3a，3bと、前記定滑車3a，3bのそれぞれ
に左右独立して８の字に巻き掛けられて前記テーブル１
の各側面の二ケ所に固定されて前記テーブル１を上下駆
動するワイヤロープ4a，4bを具備してなる用紙ホッパの
テーブル昇降装置において、前記定滑車3a，3bの対向す
る少なくとも一対を共通の回転軸７で連結すると共に、
当該回転軸７の中間に所定の遊び角度を有するクラッチ
８を介在せしめて構成する。In order to achieve the above object, as shown in FIG. 1, at least one elastic member 2 suspends a table 1 on which sheets 6 are stacked and constantly urges it in an ascending direction. And at least two pairs of fixed sheaves 3a and 3b fixed above and below the left and right side walls facing the left and right side surfaces of the table 1, and the left and right sheaves 3a and 3b independently of each other. Table 1 wrapped around the letter
In a table lifting device for a paper hopper, which is fixed to two positions on each side of the table and comprises wire ropes 4a and 4b for vertically driving the table 1, at least a pair of the fixed pulleys 3a and 3b facing each other are commonly rotated. While connecting with the shaft 7,
A clutch 8 having a predetermined play angle is interposed in the middle of the rotary shaft 7.
【００１４】[0014]
【作用】定滑車3a，3bの対向する少なくとも一対を共通
の回転軸７で連結すると共に、当該回転軸７の中間に所
定の遊び角度を有するクラッチ８を介在せしめることに
より、用紙６を積載してテーブル１を下降させる際に、
テーブル１に左右不均衡な押下力が作用しても、最初は
クラッチ８の前記所定の遊び角度に対応する上下方向の
移動距離に到達するまでテーブル１の面の傾きは発生す
るが、遊び角度が無くなると回転軸７は直結状態とな
り、左右の定滑車は同期して回転するようになる。The paper 6 is loaded by connecting at least a pair of facing constant pulleys 3a and 3b with a common rotary shaft 7 and interposing a clutch 8 having a predetermined play angle in the middle of the rotary shaft 7. When lowering the table 1 by
Even if a left-right unbalanced pressing force is applied to the table 1, the inclination of the surface of the table 1 occurs at first until the vertical movement distance of the clutch 8 corresponding to the predetermined play angle is reached. When there is no longer, the rotary shaft 7 is directly connected, and the left and right constant pulleys rotate in synchronization.
【００１５】即ち、テーブル１の面に加圧される左右不
均等な押圧力に起因するテーブル面の傾きは、クラッチ
８の遊び角度に規制されることになり、その後は押圧力
の変化に対応して用紙ホッパ上の用紙最上位部用紙表面
が常に均一な押圧力で用紙分離機構に当接するようにク
ラッチ８の遊び角度の範囲内で自動的にテーブル１の面
の傾きが定まる。従って、テーブル面が不安定に傾き用
紙補給作業に支障をきたす問題点を解決できる。That is, the inclination of the table surface caused by the uneven pressure force applied to the surface of the table 1 is regulated by the play angle of the clutch 8, and thereafter the change of the pressure force is dealt with. Then, the inclination of the surface of the table 1 is automatically determined within the play angle range of the clutch 8 so that the uppermost sheet surface of the sheet on the sheet hopper always contacts the sheet separating mechanism with a uniform pressing force. Therefore, it is possible to solve the problem that the table surface is unstable and hinders the paper supply operation.
【００１６】[0016]
【実施例】以下本発明の実施例を図面によって詳述す
る。図１は本発明の一実施例の機構を示す斜視図であ
る。この図が図５と異なる点は、図５における定滑車3
a，3bの内の対向する少なくとも一対を共通の回転軸７
で連結すると共に、その回転軸７の中間に所定の遊び角
度を有するクラッチ８を介在せしめている点である。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a mechanism of one embodiment of the present invention. The difference between this figure and FIG. 5 is that the fixed pulley 3 in FIG.
At least one pair of a and 3b facing each other has a common rotary shaft 7
Is connected and a clutch 8 having a predetermined play angle is interposed in the middle of the rotary shaft 7.
【００１７】図２は本発明の回転軸とクラッチの断面図
を示す。図において、回転軸７の中間には所定の遊び角
度を有するクラッチ８が設けられ、回転軸７の両端には
それぞれ定滑車3a，3bが固定されている。9a〜9dはそれ
ぞれ回転軸７に滑合する軸受けであって、10ａ〜10ｄは
それぞれ軸受9a〜9dを支持する電子写真装置側のフレー
ムの破断図を示す。FIG. 2 shows a sectional view of the rotating shaft and the clutch of the present invention. In the figure, a clutch 8 having a predetermined play angle is provided in the middle of the rotary shaft 7, and fixed pulleys 3a and 3b are fixed to both ends of the rotary shaft 7, respectively. Reference numerals 9a to 9d are bearings that slide on the rotary shaft 7, and reference numerals 10a to 10d are cutaway views of the electrophotographic apparatus side frame that supports the bearings 9a to 9d, respectively.
【００１８】なお、回転軸７と定滑車3a，3bとの固定部
分の近傍に従来例にて述べた図示しない一方向クラッチ
付ギアと緩衝部材を併設することも可能であることは言
うまでもない。Needless to say, a gear with a one-way clutch and a cushioning member (not shown) described in the conventional example can be provided in the vicinity of the fixed portion between the rotary shaft 7 and the constant pulleys 3a and 3b.
【００１９】図３は本発明のクラッチの分解斜視図を示
す。図において、クラッチ８は一方の回転軸７に結合さ
れた角穴8aを有する雌部と、他方の回転軸７に結合され
た角棒8bを有する雄部とから構成され、角棒8bは所定の
遊び角度を持って角穴8aと嵌合し、回転力の伝達を行
う。このクラッチ８は原理的な構造を示したもので、こ
の構造に限るものではなく、２枚の円板の当接面に所定
の係合溝を設けて遊び角度を規制する方法等も考えられ
る。FIG. 3 shows an exploded perspective view of the clutch of the present invention. In the figure, the clutch 8 is composed of a female portion having a square hole 8a connected to one rotating shaft 7 and a male portion having a square rod 8b connected to the other rotating shaft 7, and the square rod 8b has a predetermined size. The play angle is fitted into the square hole 8a to transmit the rotational force. This clutch 8 shows a principle structure, and is not limited to this structure, and a method of providing a predetermined engaging groove on the contact surface of two discs to regulate the play angle may be considered. ..
【００２０】図４は本発明のクラッチの遊び角度を示す
図であって、クラッチ８の雌側に穿設された矩形の角穴
8aに、その角穴8aより小さい寸法に形成された角棒8bを
嵌合せしめて回転限度まで左右に回転させ、遊び角度α
が得られる状態を示したものである。以下図４を参照し
ながら図１の説明を行う。FIG. 4 is a view showing the play angle of the clutch of the present invention, which is a rectangular square hole formed on the female side of the clutch 8.
Fit a square bar 8b smaller than the square hole 8a into the 8a and rotate it to the left or right until it reaches the rotation limit.
Is a state in which is obtained. 1 will be described below with reference to FIG.
【００２１】用紙６をテーブル１上に補給する場合に
は、オペレータは手動操作にてテーブル１を下方に押下
げる。この時テーブル１に加わる押下力が左右不均等の
場合はワイヤロープ4a，4bにも不均等な力が加わり、テ
ーブル１はクラッチ８の遊び角度が無くなる限度までは
傾くが、その限度以上になるとクラッチ８は直結状態と
なり、回転軸７の両端に固定された定滑車3a，3bは同期
して回転するため、傾き角度は増加しない。When the sheet 6 is replenished on the table 1, the operator manually pushes the table 1 downward. At this time, when the pressing force applied to the table 1 is uneven in the left and right, the uneven force is also applied to the wire ropes 4a and 4b, and the table 1 tilts to the limit where the play angle of the clutch 8 disappears, but when it exceeds the limit. Since the clutch 8 is in the direct connection state and the constant pulleys 3a and 3b fixed to both ends of the rotary shaft 7 rotate in synchronization, the tilt angle does not increase.
【００２２】このテーブルの傾き角度は、クラッチ８の
遊び角度により規制されるから、予めその遊び角度を所
要の角度に設定しておけば用紙補給時の不都合は解消で
きる。しかも、用紙６をテーブル１にセット後は用紙６
の自重によるテーブル１に対する押下力に対応して用紙
ホッパ上の用紙最上位部用紙表面が常に均一な押圧力で
用紙分離機構に当接するようにクラッチ８の遊び角度の
範囲内で自動的にテーブル１の面の傾きは補正可能とな
る。Since the inclination angle of the table is regulated by the play angle of the clutch 8, if the play angle is set to a required angle in advance, the inconvenience at the time of paper supply can be eliminated. Moreover, after the paper 6 is set on the table 1, the paper 6 is
The table is automatically moved within the play angle range of the clutch 8 so that the uppermost sheet surface of the sheet on the sheet hopper always comes into contact with the sheet separating mechanism with a uniform pressing force corresponding to the pressing force against the table 1 due to its own weight. The inclination of the surface 1 can be corrected.
【００２３】[0023]
【発明の効果】以上の説明から明らかなように本発明に
よれば、用紙セット時のテーブルの急激な下降に際して
もテーブル面を略水平に保持し、且つ用紙給紙時のテー
ブル面を用紙分離手段に対して常に平行に押圧可能とな
る効果がある。As is apparent from the above description, according to the present invention, the table surface is kept substantially horizontal even when the table is rapidly lowered when the paper is set, and the table surface is separated when the paper is fed. There is an effect that the means can always be pressed in parallel.
【図１】 本発明の一実施例の機構を示す斜視図FIG. 1 is a perspective view showing a mechanism of an embodiment of the present invention.
【図２】 本発明の回転軸とクラッチの断面図FIG. 2 is a sectional view of a rotating shaft and a clutch according to the present invention.
【図３】 本発明のクラッチの分解斜視図FIG. 3 is an exploded perspective view of the clutch of the present invention.
【図４】 本発明のクラッチの遊び角度を示す図FIG. 4 is a diagram showing a play angle of the clutch of the present invention.
【図５】 従来の用紙ホッパのテーブル昇降装置の原理
を示す斜視図FIG. 5 is a perspective view showing the principle of a conventional table lifting device for a paper hopper.
１ テーブル ２ 弾性部材 3a，3b 定滑車 4a，4b ワイヤロープ ６ 用紙 ７ 回転軸 ８ クラッチ 1 table 2 elastic members 3a, 3b fixed pulleys 4a, 4b wire rope 6 paper 7 rotating shaft 8 clutch
Claims (1)
を懸吊すると共に常に昇動方向へ付勢する少なくとも一
つの弾性部材（２）と、前記テーブル（１）の左右両側
面と対向する左右の側壁の上方および下方に少なくとも
２対ずつ固設された定滑車（3a，3b）と、前記定滑車
（3a，3b）のそれぞれに左右独立して８の字に巻き掛け
られて前記テーブル（１）の各側面の二ケ所に固定され
て前記テーブル（１）を上下駆動するワイヤロープ（4
a，4b）を具備してなる用紙ホッパのテーブル昇降装置
において、前記定滑車（3a，3b）の対向する少なくとも
一対を共通の回転軸（７）で連結すると共に、当該回転
軸（７）の中間に所定の遊び角度を有するクラッチ
（８）を介在せしめたことを特徴とする用紙ホッパのテ
ーブル昇降装置。1. A table (1) on which sheets (6) are stacked.
At least one elastic member (2) for suspending and constantly urging in the ascending direction, and at least two pairs fixed above and below the left and right side walls facing the left and right side surfaces of the table (1). The fixed pulleys (3a, 3b) and the fixed pulleys (3a, 3b) are independently wound around the left and right sides in a figure 8 and fixed to two positions on each side of the table (1). Wire rope (4) that drives (1) up and down
a, 4b), a table lifting device for a paper hopper, wherein at least a pair of facing constant pulleys (3a, 3b) are connected by a common rotary shaft (7) and the rotary shaft (7) A table lifting device for a paper hopper, characterized in that a clutch (8) having a predetermined play angle is interposed in the middle.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4051418A JPH05246555A (en) | 1992-03-10 | 1992-03-10 | Table elevating device for paper hopper |
| DE69208029T DE69208029T2 (en) | 1991-11-13 | 1992-11-11 | Stack holder for paper |
| EP92119276A EP0542223B1 (en) | 1991-11-13 | 1992-11-11 | Paper hopper |
| US08/113,362 US5305996A (en) | 1991-11-13 | 1993-08-30 | Paper hopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4051418A JPH05246555A (en) | 1992-03-10 | 1992-03-10 | Table elevating device for paper hopper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05246555A true JPH05246555A (en) | 1993-09-24 |
Family
ID=12886384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4051418A Pending JPH05246555A (en) | 1991-11-13 | 1992-03-10 | Table elevating device for paper hopper |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05246555A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018184286A (en) * | 2017-04-27 | 2018-11-22 | キヤノンファインテックニスカ株式会社 | Sheet stacking apparatus, feeding apparatus, image forming apparatus, and image forming system |
-
1992
- 1992-03-10 JP JP4051418A patent/JPH05246555A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018184286A (en) * | 2017-04-27 | 2018-11-22 | キヤノンファインテックニスカ株式会社 | Sheet stacking apparatus, feeding apparatus, image forming apparatus, and image forming system |
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