JPH03288735A - Automatic paper feeding device - Google Patents

Automatic paper feeding device

Info

Publication number
JPH03288735A
JPH03288735A JP2090559A JP9055990A JPH03288735A JP H03288735 A JPH03288735 A JP H03288735A JP 2090559 A JP2090559 A JP 2090559A JP 9055990 A JP9055990 A JP 9055990A JP H03288735 A JPH03288735 A JP H03288735A
Authority
JP
Japan
Prior art keywords
paper
paper feed
feed roller
pad
arm
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
JP2090559A
Other languages
Japanese (ja)
Inventor
Hidehiko Fujiwara
秀彦 藤原
Hideyo Watanabe
英世 渡辺
Hiroyuki Idenawa
弘行 出縄
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP2090559A priority Critical patent/JPH03288735A/en
Publication of JPH03288735A publication Critical patent/JPH03288735A/en
Pending legal-status Critical Current

Links

Landscapes

  • Paper Feeding For Electrophotography (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

PURPOSE:To improve the pressing position precision by connecting a paper feeding roller with a pad holder fixed on the device body through a connecting arm and turning the connecting arm, having the installation part with the holder as fulcrum. CONSTITUTION:One edge 32a of a connecting arm 32 is held in rotatable manner at both edges of the rotary shaft 31 of a paper feeding roller 30, and the other edge 32b is installed in rotatable manner on a pad holder 40 fixed on a body, by a shaft 33. Accordingly, the arm 32 is freely turned around the shaft 33. The arm 32 is pressed by a spring 44, and the paper feeding roller 30 contacts a friction pad 41 held on the holder 40. Accordingly, the paper feeding roller 30 and the friction pad 41 can be always pressed at a constant position by an arm 22, and the top edges of the low-lying paper sheets which are driven out overlapping each other pass through a gap 45 and surely contact with the edge surface 42a, and the double feed is surely prevented.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、プリンタや複写機やファクシミリや印刷機
など、用紙を使用してそれに印字・転写・複写・印刷等
の記録を行う記録装置に適用し得る。
[Detailed Description of the Invention] Industrial Field of Application This invention is applicable to recording devices such as printers, copiers, facsimile machines, and printing machines that use paper to record information such as printing, transferring, copying, printing, etc. obtain.

詳しくは、そのような記録装置において、積載した用紙
を上から順に一枚づつ分離して自動的に送り出す自動給
紙装置に関する。
More specifically, the present invention relates to an automatic paper feeder that automatically separates and automatically feeds stacked sheets one by one from the top in such a recording apparatus.

従来の技術 従来、この種の自動給紙装置の中には、たとえば第6図
に示すように、給紙コロ1を図示省略した側板に支持軸
2を介して支持し、他方、フリクションパッド3を保持
するパッドホルダ4を給紙トレイ5にスプリング6を介
して取り付けてフリクションパッド3を給紙コロ1に押
し当てる構成とするものがある。また、他の自動給紙装
置の中には、たとえば第7図に示すように、図示省略し
た側板に設けるガイド孔(図示省略)に両端を入れる支
持軸2を介して給紙コロ1を保持するとともに、給紙1
−レイ5を取り付けたときにレバー7・8を介してフリ
クションパッド3の押し当て状態とし、給紙l〜レイ5
を引き出したときにレバー7・8を介してフリクション
パッド3の押し当てを解除した状態に給紙コロ1を保持
する構成のものもある(特開昭62−56227号公報
参照)。
2. Description of the Related Art Conventionally, in this type of automatic paper feeder, as shown in FIG. There is a structure in which a pad holder 4 holding a paper feed tray 5 is attached via a spring 6 to press the friction pad 3 against a paper feed roller 1. In other automatic paper feeding devices, as shown in FIG. 7, for example, a paper feeding roller 1 is held via a support shaft 2 whose both ends are inserted into guide holes (not shown) provided in a side plate (not shown). At the same time, paper feed 1
- When the lay 5 is attached, the friction pad 3 is pressed through the levers 7 and 8, and the paper feed l~lay 5 is pressed.
There is also a structure in which the paper feed roller 1 is held in a state in which the friction pad 3 is released from the friction pad 3 via the levers 7 and 8 when the paper feed roller 1 is pulled out (see Japanese Patent Laid-Open No. 62-56227).

そして、それら従来の自動給紙装置は、その給紙コロ1
を回転して給紙トレイ5内に積載した用紙Pを繰り出し
、フリクションパッド3との摩擦で上から順に一枚づつ
分離しながら自動的に送り出していた。
And, those conventional automatic paper feeding devices have paper feeding roller 1
The paper P stacked in the paper feed tray 5 is fed out by rotating, and the paper P is automatically fed out while being separated one by one from the top by friction with the friction pad 3.

発明が解決しようとする課題 ところで、この自動給紙装置において、用紙分離性能を
安定させて用紙の重送を確実に防止するためには、給紙
コロ1がフリクションパッド3にその表面に一定位置で
接触するように、両者を所定の位置に精度よく設置する
必要がある。しかし、上述した従来の自動給紙装置のう
ち、前者の構成では、給紙コロ1を側板で支持する一方
、パッドホルダ4を給紙1ヘレイ5で支持し、また、後
者の構成では、給紙コロ1を側板で支持する一方、パッ
ドホルダ4を保持枠9で支持する。したがって、このよ
うに従来では、給紙コロ1とパッドホルダ4をそれぞれ
別の支持部材で支持する構成とするから、給紙コロ1と
フリクションパッド3を相対的に位置精度よく設けるこ
とは困難であり、そのため、自動給紙装置における用紙
分離性能が安定せず、用紙の重送を確実に防止すること
ができないという問題があった。
Problems to be Solved by the Invention By the way, in this automatic paper feeder, in order to stabilize the paper separation performance and reliably prevent double feeding of paper, the paper feed roller 1 must be placed on the surface of the friction pad 3 at a fixed position. It is necessary to accurately install both in a predetermined position so that they are in contact with each other. However, among the conventional automatic paper feeders described above, in the former configuration, the paper feed roller 1 is supported by the side plate, while the pad holder 4 is supported by the paper feed 1 tray 5; A paper roller 1 is supported by a side plate, and a pad holder 4 is supported by a holding frame 9. Therefore, in the conventional structure, the paper feed roller 1 and the pad holder 4 are supported by separate support members, so it is difficult to provide the paper feed roller 1 and the friction pad 3 with good relative positional accuracy. Therefore, there was a problem in that the paper separation performance in the automatic paper feeder was unstable and double feeding of paper could not be reliably prevented.

そこで、この発明の目的は、上述した自動給紙装置にお
いて、給紙コロとフリクションパッドの位置精度を上げ
て用紙分離性能を安定させ、用紙の重送を確実に防止す
ることにある。
SUMMARY OF THE INVENTION An object of the present invention is to improve the positional accuracy of the paper feed rollers and friction pads in the automatic paper feeder described above, stabilize the paper separation performance, and reliably prevent double feeding of paper sheets.

課題を解決するための手段 そのため、請求項1に記載のこの発明は、たとえば以下
の図示実施例に示すとおり、パッドホルダ40でフリク
ションパッド41を保持してそれに給紙コロ30を押し
当て、その給紙コロ30を回転して積載した用紙18を
繰り出し、前記フリクションパッド41との摩擦で上か
ら順に一枚づつ分離しながら自動的に送り出す記録装置
の自動給紙装置20において、装置本体10のような記
録装置本体に前記パッドホルダ40を固定し、そのパッ
ドホルダ40と前記給紙コロ30とを連結アーム32で
連結し、その連結アーム32を前記パッドホルダ40へ
の支持軸33のような取付部を支点として回動し、前記
給紙コロ30を前記フリクションパッド41に押し当て
る押し当て位置とその押し当てを解除する退避位置とに
移動自在に設けてなることを特徴とする。
Means for Solving the Problems Therefore, the present invention as set forth in claim 1, for example, as shown in the illustrated embodiment below, holds a friction pad 41 with a pad holder 40 and presses a paper feed roller 30 against it. In the automatic paper feeder 20 of the recording apparatus, the stacked paper 18 is fed out by rotating the paper feed roller 30, and the paper is separated one by one from the top by friction with the friction pad 41 and is automatically fed out. The pad holder 40 is fixed to the main body of the recording apparatus, the pad holder 40 and the paper feed roller 30 are connected by a connecting arm 32, and the connecting arm 32 is connected to the pad holder 40 by a support shaft 33 or the like. It is characterized in that it is rotatable about the mounting part as a fulcrum and is movably provided between a pressing position where the paper feed roller 30 is pressed against the friction pad 41 and a retreat position where the pressing is released.

また、請求項2に記載のこの発明は、以下の図示実施例
において示すとおり、前記請求項1に記載のこの発明に
おいて、給紙トレイ17の未装着時は、回動習性に基づ
き前記連結アーム32を回4 動して前記給紙コロ30を前記退避位置とし、給紙トレ
イ17の装着時はその給紙トレイ17により押されて前
記回動習性に抗して回動する作動アーム51を設け、そ
の作動アーム51と前記連結アーム32とを連結して前
記作動アーム51の回動習性に抗しての回動にともない
前記連結アーム32を回動して前記給紙コロ30を前記
押当て位置とする引張スプリング53のようなスプリン
グを設けてなることを特徴とする。
Further, as shown in the illustrated embodiments below, in the invention as set forth in claim 1, when the paper feed tray 17 is not installed, the connecting arm 32 to bring the paper feed roller 30 to the retracted position, and when the paper feed tray 17 is installed, the operating arm 51 is pushed by the paper feed tray 17 and rotates against the rotational behavior. The actuating arm 51 and the connecting arm 32 are connected, and as the actuating arm 51 rotates against the rotational habit, the connecting arm 32 is rotated to push the paper feed roller 30. It is characterized in that a spring such as a tension spring 53 is provided as a contact position.

作   用 そして、請求項1に記載のこの発明では、給紙コロ30
を回転して用紙18を送り出す。給紙中に用紙18がジ
ャムしたときは、適宜連結アーム32を回動し、給紙コ
ロ30をその押し当てを解除する退避位置へと移動する
Function And, in this invention according to claim 1, the paper feed roller 30
The paper 18 is sent out by rotating. When the paper 18 jams during paper feeding, the connecting arm 32 is rotated as appropriate to move the paper feeding roller 30 to a retracted position where the pressing is released.

また、請求項2に記載のこの発明では、給紙トレイ17
を装着して給紙を行うときは、その給紙トレイ17で作
動アーム51をその回動習性に抗して一方向に回動し、
さらにそれにともないスプリングで回動して給紙コロ3
0を押当て位置に移動する。給紙中に用紙18がジャム
したとき、給紙トレイ17を引き出すと、作動アーム5
1をその回動習性に基づき他方向に回動して給紙コロ3
0を退避位置へと移動する。
Further, in the present invention according to claim 2, the paper feed tray 17
When feeding paper with the paper feeding tray 17 mounted, the actuating arm 51 is rotated in one direction against the rotational behavior of the paper feeding tray 17.
Furthermore, along with this, the paper feed roller 3 is rotated by a spring.
0 to the pressing position. When the paper 18 jams during paper feeding, when the paper feed tray 17 is pulled out, the operating arm 5
1 in the other direction based on its rotational behavior to feed paper roller 3.
0 to the retreat position.

実施例 以下、図面を参照しつつ、この発明の実施例につき説明
する。
Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

第5図は、この発明の一実施例である自動給紙装置を備
えるレーザプリンタで、その内部機構の概略構成を示す
。図中符号10は、装置本体である。装置本体10内に
は、中央に、ドラム状の感光体11を設ける。その感光
体11のまわりには、下側の帯電器12から該感光体1
1の回転方向(反時計方向)に順に、右側の現像器13
、上側の転写器14、左側のクリーニング器15を配置
する。そして、転写器12、現像器13、クリーニング
器15の下側には、光書込み器16を備える。光書込み
器16のさらに下側には、給紙トレイ17を着脱自在に
装填する。給紙トレイ17内には、用紙18を収納する
。そして、現像器13の右側には、この発明による自動
給紙装置20から送り出した用紙18を上方へと導く給
紙路21を備える。給紙路21の先には手差し給紙口2
2から挿入された用紙18と共通の用紙搬送路23を設
け、用紙18を感光体11へと案内する。用紙搬送路2
3の途中には、レジストローラ対24を配置する。他方
、前述の転写器12を挾んで、該レジストローラ対24
を配置すると反対の側には、搬送器25を備え、さらに
その先に定着器26を設ける。定着器26の左側には、
排紙受け27を設置する。
FIG. 5 shows a schematic structure of the internal mechanism of a laser printer equipped with an automatic paper feeder, which is an embodiment of the present invention. The reference numeral 10 in the figure is the main body of the apparatus. Inside the apparatus main body 10, a drum-shaped photoreceptor 11 is provided at the center. Around the photoreceptor 11, a charger 12 on the lower side is connected to the photoreceptor 11.
In order of rotation direction (counterclockwise) of No. 1, the right developing device 13
, the transfer device 14 on the upper side, and the cleaning device 15 on the left side are arranged. An optical writing device 16 is provided below the transfer device 12, the developing device 13, and the cleaning device 15. Further below the optical writer 16, a paper feed tray 17 is removably loaded. Paper 18 is stored in the paper feed tray 17 . On the right side of the developing device 13, there is provided a paper feed path 21 that guides the paper 18 sent out from the automatic paper feeder 20 according to the present invention upward. There is a manual paper feed slot 2 at the end of the paper feed path 21.
A paper conveyance path 23 common to the paper 18 inserted from 2 is provided, and the paper 18 is guided to the photoreceptor 11. Paper transport path 2
3, a pair of registration rollers 24 is arranged. On the other hand, the above-mentioned transfer device 12 is sandwiched between the pair of registration rollers 24.
A conveyor 25 is provided on the opposite side, and a fixing device 26 is further provided beyond that. On the left side of the fixing device 26,
Install the paper ejection tray 27.

しかして、いま該レーザプリンタを用いて電子写真方式
によって記録を行うときは、自動給紙装置20を駆動し
、給紙トレイ17から用紙18を一枚ずつ分離して給紙
路21へと自動的に送り出す。または、切り換えて手差
し給紙口22から用紙18を手差しする。そして、自動
給紙装置20または手差し給紙口22から給紙した用紙
18は、やがてその先端をレジストローラ対24に突き
当てて止める。
However, when recording by electrophotography using the laser printer, the automatic paper feeder 20 is driven to separate the sheets 18 from the paper feed tray 17 one by one and automatically feed them into the paper feed path 21. send out to target. Alternatively, the user can switch and manually feed the paper 18 from the manual paper feed slot 22. Then, the paper 18 fed from the automatic paper feeder 20 or the manual paper feed port 22 eventually hits the leading end of the paper against the pair of registration rollers 24 and is stopped.

7− 一方、感光体11は、図中反時計方向に回転しながら、
帯電器12でその表面を一様に帯電し、次に光書き込み
器16でレーザ光を照射してその表面に静電潜像を形成
し、続いて現像器13を通るときその静電潜像をトナー
によって逐次可視像化する。そして、その像とタイミン
グを合わせ、前述のレジストローラ対24に突き当てて
いた用紙18を感光体11に向けて送り出す。しかして
、その感光体11上の像を、転写器14によって該用紙
18に転写する。転写後、感光体11上の残留トナーは
、クリーニング器15のクリーニングブレード28でか
き落し、回収タンク29内に回収する。続いて、感光体
11に残った電荷は、除電器30で除電する。
7- On the other hand, the photoreceptor 11 rotates counterclockwise in the figure,
The surface is uniformly charged with the charger 12, and then an electrostatic latent image is formed on the surface by irradiating laser light with the optical writer 16, and then when it passes through the developer 13, the electrostatic latent image is are sequentially visualized using toner. Then, in synchronization with the image, the paper 18 that had been in contact with the pair of registration rollers 24 described above is sent out toward the photoreceptor 11. The image on the photoreceptor 11 is then transferred onto the paper 18 by the transfer device 14. After the transfer, the residual toner on the photoreceptor 11 is scraped off by a cleaning blade 28 of the cleaning device 15 and collected into a collection tank 29. Subsequently, the charge remaining on the photoreceptor 11 is removed by a static eliminator 30.

一方、用紙18は、搬送器25によって定着器26へと
送り、転写した像をその定着器26で熱定着する。その
後、該用紙18を送り出し、排紙受け27上に順次スタ
ックする。
On the other hand, the paper 18 is sent to a fixing device 26 by a conveyor 25, and the transferred image is thermally fixed by the fixing device 26. Thereafter, the sheets 18 are sent out and stacked one after another on the sheet discharge tray 27.

ところで、上述した自動給紙装置20は、詳しくは第1
図および第2図に示すように構成する。
By the way, the above-mentioned automatic paper feeder 20 is specifically
It is constructed as shown in the figure and FIG.

8− 図中符号30は、給紙コロであり、回転軸31に設ける
。回転軸31の両端は、連結アーム32の一端部32a
で回転自在に保持する。その連結アーム32は、その他
端部32bで支持軸33にそれを中心として回動可能に
取り付ける。そして、この連結アーム32には、一端を
装置本体10内の適宜固定部材に取り付ける圧縮スプリ
ング34の他端を押し当てて支持軸33を中心として常
時図中反時計方向の回動習性を与える。支持軸33は、
その両端を側板35・36に固定し、その−端側(図中
右側)にアイドラギヤ37を回転自在に取り付ける。ア
イドラギヤ37は、ギヤ38・39と噛み合い図示省略
した駆動モータの回転を伝達して給紙コロ30を回転可
能とする。そして、この給紙コロ30をパッドホルダ4
0の上側に保持するフリクションパッド41と最上位の
用紙18に押し当てる。このフリクションパッド41は
、パッドホルダ40における用紙搬送方向下流側(図中
右側)に設ける固定パッド42と、その上流側に設ける
可動パッド43とからなる。固定パラド42は、可動パ
ッド43側にエツジ面42aを形成する。そして、表面
に給紙コロ30を押し当ててなる。他方、可動パッド4
3は、パッドホルダ40の凹部40a内に屈曲して設け
る板ばね44上に取り付ける。そして、その板ばね44
で上向きに付勢して固定パッド42側の上端縁を給紙コ
ロ30に押し付ける。しかして、その上端縁とエツジ面
42aとの間に一定のすき間45をあけて、給紙コロ3
0を図中実線で示す押当て位置に配置してなる。
8- Reference numeral 30 in the figure is a paper feed roller, which is provided on the rotating shaft 31. Both ends of the rotating shaft 31 are connected to one end 32a of the connecting arm 32.
to hold it freely in rotation. The connecting arm 32 is rotatably attached to the support shaft 33 at the other end 32b. The other end of a compression spring 34 whose one end is attached to a suitable fixing member within the apparatus main body 10 is pressed against the connecting arm 32 to give it a habit of constantly rotating counterclockwise in the figure about the support shaft 33. The support shaft 33 is
Both ends thereof are fixed to side plates 35 and 36, and an idler gear 37 is rotatably attached to the negative end side (right side in the figure). The idler gear 37 meshes with the gears 38 and 39 and transmits the rotation of a drive motor (not shown) to enable the paper feed roller 30 to rotate. Then, this paper feed roller 30 is placed in the pad holder 4.
The paper 18 is pressed against the friction pad 41 held above the sheet 0 and the uppermost sheet 18. The friction pad 41 includes a fixed pad 42 provided on the downstream side (right side in the figure) of the pad holder 40 in the paper conveyance direction, and a movable pad 43 provided on the upstream side thereof. The fixed pad 42 forms an edge surface 42a on the movable pad 43 side. Then, a paper feed roller 30 is pressed against the surface. On the other hand, the movable pad 4
3 is attached onto a leaf spring 44 which is bent and provided in the recess 40a of the pad holder 40. And the leaf spring 44
to press the upper edge of the fixing pad 42 side against the paper feed roller 30. Then, a certain gap 45 is left between the upper edge and the edge surface 42a, and the paper feed roller 3
0 is placed at the pressing position shown by the solid line in the figure.

そして、第3図に示すように、給紙コロ30を図中矢示
する反時計方向に回転して給紙トレイ11内から用紙1
8を繰り出す。このとき、もし用紙18が図示のように
二枚重ねて送り出されたときは、板ばね44を撓ませて
給紙コロ30と可動パッド43との間を通して上位の用
紙18aを通過する。もし、下位の用紙18bが給紙コ
ロと可動パッド43との間を通過したときは、図示する
ごとくすき間45を通して固定パッド42のエツジ面4
2aに突き当てて止める。このように、上位の用紙18
aのみを板ばね44の付勢力で給紙コロ30に密着して
固定パッド42との間に導き、給紙コロ30と固定パッ
ド42との間を通して送り出す。そして、次には下位の
用紙18bを給紙コロ30に密着して固定パッド42と
の間に導き、同様にそれらの間を通して送り出す。これ
により、積載した用紙18を上から順に一枚づつ分離し
て自動的に送り出すことができる。他方、この給紙中に
用紙18がジャムしたときは、たとえば、適宜操作レバ
ーなどを操作して連結アーム32を第1図中時計方向に
回動し、給紙コロ3′0をその押当てを解除して図中点
線で示す退避位置へと移動する。
Then, as shown in FIG. 3, the paper feed roller 30 is rotated counterclockwise as shown by the arrow in the figure to remove the paper from inside the paper feed tray 11.
Roll out 8. At this time, if two sheets of paper 18 are fed out as shown in the figure, the leaf spring 44 is bent and the paper 18 passes between the paper feed roller 30 and the movable pad 43 and passes over the upper sheet 18a. If the lower paper 18b passes between the paper feed roller and the movable pad 43, it passes through the gap 45 as shown in the figure, and the edge surface 4 of the fixed pad 42
Hit 2a and stop. In this way, the upper paper 18
Only a is brought into close contact with the paper feed roller 30 by the biasing force of the leaf spring 44, guided between the paper feed roller 30 and the fixed pad 42, and sent out through between the paper feed roller 30 and the fixed pad 42. Then, the lower paper 18b is brought into close contact with the paper feed roller 30 and guided between it and the fixing pad 42, and similarly sent out through the gap therebetween. Thereby, the stacked sheets 18 can be separated one by one from the top and automatically sent out. On the other hand, if the paper 18 jams during paper feeding, for example, operate the operating lever as appropriate to rotate the connecting arm 32 clockwise in FIG. , and move to the retracted position shown by the dotted line in the figure.

そして、この発明では、そもそも給紙コロ30をフリク
ションパッド41を取り付ける同じパッドホルダ40に
連結アーム32で連結するから、給紙コロ30とフリク
ションパッド41を互いに位置精度よく設けることが可
能となる。たとえば、この図示実施例では、前記下位の
用紙18bが侵入するすき間45の大きさが一定となる
所定の押1 当て位置で給紙コロ30がフリクションパッド41に当
るように5両者を位置決めて設けることができる。した
がって、重なって繰り出された下位の用紙18bの先端
がすき間45を通って確実にエツジ面42aに突き肖た
り、よって、用紙18の重送をより一層確実に防止する
ことができる。
In this invention, since the paper feed roller 30 is connected to the same pad holder 40 to which the friction pad 41 is attached by the connecting arm 32, the paper feed roller 30 and the friction pad 41 can be provided with high positional accuracy relative to each other. For example, in this illustrated embodiment, the paper feed roller 30 is positioned so that it hits the friction pad 41 at a predetermined pushing position in which the size of the gap 45 into which the lower paper 18b enters is constant. be able to. Therefore, the leading ends of the lower sheets 18b that are fed out in an overlapped manner pass through the gap 45 and reliably strike the edge surface 42a, so that double feeding of the sheets 18 can be more reliably prevented.

ところで、上述した図示実施例では、常時は給紙コロ3
0を押し当て位置とし、用紙18がジャムすると、レバ
ー操作などの手動によって退避位置とする構成にする。
By the way, in the illustrated embodiment described above, the paper feed roller 3 is always
0 is the pressing position, and when the paper 18 jams, it is configured to be moved to the retracted position manually such as by operating a lever.

しかし、この発明は、たとえば第4図に示すように、給
紙トレイ17の未装着時に給紙コロ30を退避位置とし
、その装着時には自動的に給紙コロ30が押当て位置と
なるように、給紙トレイ17の着脱に応じて給紙コロ3
0をフリクションパッド41に対して押し当て位置とそ
の退避位置とに移動自在にする構成とすることもできる
。すなわち、この他の実施例では、前記側板で支持する
軸50にV状の作動アーム51を取り付ける。作動アー
ム51は、その軸50を支点として回動自在に設ける。
However, in the present invention, as shown in FIG. 4, for example, the paper feed roller 30 is placed in the retracted position when the paper feed tray 17 is not installed, and the paper feed roller 30 is automatically placed in the pressed position when it is installed. , the paper feed roller 3 depending on the attachment/detachment of the paper feed tray 17.
0 can also be configured to be freely movable between a pressing position and a retracted position with respect to the friction pad 41. That is, in this other embodiment, a V-shaped actuation arm 51 is attached to the shaft 50 supported by the side plate. The actuating arm 51 is rotatably provided about its shaft 50 as a fulcrum.

そして、一端52− 1aを圧縮スプリング52で付勢して常時図中時計方向
の回動習性を与える。しかして、給紙トレイ17の未装
着時には、他端51bを連結アーム32に突き当て、そ
の連結アーム32を回動して給紙コロ30を図中鎖線で
示す退避位置へと移動し、その退避位置に適宜ストッパ
で止めて保持してなる。そして、この作動アーム51の
他端51bと連結アーム32とを引張スプリング53で
連結する。
One end 52-1a is biased by a compression spring 52 to provide a constant rotational habit in the clockwise direction in the figure. When the paper feed tray 17 is not attached, the other end 51b is abutted against the connecting arm 32, and the connecting arm 32 is rotated to move the paper feed roller 30 to the retracted position shown by the chain line in the figure. It is stopped and held at the retracted position with an appropriate stopper. The other end 51b of this actuating arm 51 and the connecting arm 32 are connected by a tension spring 53.

しかしていま、図示のように給紙トレイ17を装着した
ときには、その給紙トレイ17の前板部17aが作動ア
ーム51の一端51aに押し当り、その作動アーム51
を圧縮スプリング52に抗して図中矢示する反時計方向
に回動する。そして、引張スプリング53で連結アーム
32を引っ張って回動し、給紙コロ30を給紙トレイ1
7内の用紙18およびフリクションパッド41に押し当
てる押当て位置へと移動する。しかして、給紙コロ30
を回転して用紙18を送り出す。また、その給紙中に用
紙18がジャムしたとき、給紙トレイ17を引き出せば
、圧縮スプリング52の付勢力で作動アーム51を回動
して連結アーム32を回動し、給紙コロ30を退避位置
へと自動的に移動する。
However, when the paper feed tray 17 is installed as shown in the figure, the front plate portion 17a of the paper feed tray 17 presses against one end 51a of the actuating arm 51, and the actuating arm 51
is rotated counterclockwise as shown by the arrow in the figure against the compression spring 52. Then, the connecting arm 32 is pulled and rotated by the tension spring 53, and the paper feed roller 30 is moved to the paper feed tray 1.
7 to a pressing position where it is pressed against the paper 18 and the friction pad 41. However, the paper feed roller 30
The paper 18 is sent out by rotating. In addition, when the paper 18 jams during paper feeding, if the paper feed tray 17 is pulled out, the biasing force of the compression spring 52 rotates the actuating arm 51 to rotate the connecting arm 32 and rotate the paper feed roller 30. Automatically moves to the evacuation position.

したがって、この他の図示実施例によれば、給紙トレイ
17の出し入れに応じて自動的に給紙コロ30をその押
当て位置と退避位置とに移動自在とするから、ジャム紙
を容易に取り除くことができる。
Therefore, according to the other illustrated embodiment, the paper feed roller 30 is automatically movable between the pressing position and the retracted position in accordance with the insertion and removal of the paper feed tray 17, so that jammed paper can be easily removed. be able to.

発明の効果 したがって、この発明によれば、固定したパッドホルダ
に連結アームを介して給紙コロを取り付ける構成とする
から、その給紙コロとフリクションパッドの位置精度を
上げて用紙分離性能を安定させ、よって、用紙の重送を
確実に防止することができる。
Effects of the Invention Therefore, according to the present invention, since the paper feed roller is attached to a fixed pad holder via a connecting arm, the positional accuracy of the paper feed roller and friction pad is increased, and paper separation performance is stabilized. Therefore, double feeding of sheets can be reliably prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明の一実施例である自動給紙装置の構成
図、第2図はその自動給紙装置の平面図、第3図はその
自動給紙装置の作動説明図、第4図はこの発明の他の実
施例である自動給紙装置の構成図、第5図はそれら自動
給紙装置を備えるレーザプリンタの内部機構を示す全体
概略構成図である。第6図は給紙コロを固定する従来の
自動給紙装置の構成図、第7図は給紙コロを可動する従
来の他の自動給紙装置の構成図である。 18・・・・・・・・用紙 20・・・・・・・・自動給紙装置 30・・・・・・・・・給紙コロ 32・・・・・・・・・連結アーム 40・・・・・・・・・パッドホルダ 41・・・・・・・・フリクションパッド51・・・・
・・・・作動アーム
Figure 1 is a block diagram of an automatic paper feeder that is an embodiment of the present invention, Figure 2 is a plan view of the automatic paper feeder, Figure 3 is an explanatory diagram of the operation of the automatic paper feeder, and Figure 4. 5 is a block diagram of an automatic paper feeder according to another embodiment of the present invention, and FIG. 5 is an overall schematic diagram showing the internal mechanism of a laser printer equipped with the automatic paper feeder. FIG. 6 is a block diagram of a conventional automatic paper feeder in which the paper feed roller is fixed, and FIG. 7 is a block diagram of another conventional automatic paper feeder in which the paper feed roller is movable. 18......Paper 20...Automatic paper feeder 30...Paper feed roller 32...Connection arm 40. ......Pad holder 41...Friction pad 51...
...Actuation arm

Claims (1)

【特許請求の範囲】 1、パッドホルダでフリクションパッドを保持してそれ
に給紙コロを押し当て、その給紙コロを回転して積載し
た用紙を繰り出し、前記フィリクシヨンパッドとの摩擦
で上から順に一枚づつ分離しながら自動的に送り出す記
録装置の自動給紙装置において、記録装置本体に前記パ
ッドホルダを固定し、そのパッドホルダと前記給紙コロ
とを連結アームで連結し、その連結アームを前記パッド
ホルダへの取付部を支点として回動し、前記給紙コロを
前記フリクションパッドに押し当てる押し当て位置とそ
の押し当てを解除する退避位置とに移動自在に設けてな
る、自動給紙装置。 2、給紙トレイの未装着時は、回動習性に基づき前記連
結アームを回動して前記給紙コロを前記退避位置とし、
給紙トレイの装着時はその給紙トレイにより押されて前
記回動習性に抗して回動する作動アームを設け、その作
動アームと前記連結アームとを連結して前記作動アーム
の回動習性に抗しての回動にともない前記連結アームを
回動して前記給紙コロを前記押当て位置とするスプリン
グを設けてなる、前記請求項1に記載の自動給紙装置。
[Claims] 1. Hold a friction pad with a pad holder, press a paper feed roller against it, rotate the paper feed roller to feed out the stacked paper, and the friction with the friction pad causes the paper to be drawn out from above. In an automatic paper feeding device of a recording device that automatically feeds sheets while separating them one by one, the pad holder is fixed to the main body of the recording device, and the pad holder and the paper feeding roller are connected by a connecting arm. The automatic paper feeder is configured to rotate about an attachment part to the pad holder as a fulcrum and to be movable between a pressing position where the paper feeding roller is pressed against the friction pad and a retreat position where the pressing is released. Device. 2. When the paper feed tray is not installed, the connecting arm is rotated based on rotational behavior to bring the paper feed roller to the retracted position;
When a paper feed tray is attached, an operating arm is provided that is pushed by the paper feed tray and rotates against the rotational behavior, and the operating arm and the connecting arm are connected to control the rotational behavior of the operating arm. 2. The automatic paper feeder according to claim 1, further comprising a spring that rotates the connecting arm in response to rotation of the paper feed roller to the pressing position.
JP2090559A 1990-04-05 1990-04-05 Automatic paper feeding device Pending JPH03288735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2090559A JPH03288735A (en) 1990-04-05 1990-04-05 Automatic paper feeding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2090559A JPH03288735A (en) 1990-04-05 1990-04-05 Automatic paper feeding device

Publications (1)

Publication Number Publication Date
JPH03288735A true JPH03288735A (en) 1991-12-18

Family

ID=14001774

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2090559A Pending JPH03288735A (en) 1990-04-05 1990-04-05 Automatic paper feeding device

Country Status (1)

Country Link
JP (1) JPH03288735A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09278211A (en) * 1996-04-16 1997-10-28 Pfu Ltd Document medium processing device having pad open condition releasing means
US7497432B2 (en) 2004-03-15 2009-03-03 Brother Kogyo Kabushiki Kaisha Sheet supplying device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09278211A (en) * 1996-04-16 1997-10-28 Pfu Ltd Document medium processing device having pad open condition releasing means
US7497432B2 (en) 2004-03-15 2009-03-03 Brother Kogyo Kabushiki Kaisha Sheet supplying device

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