JPH0958886A - Paper feeding device - Google Patents

Paper feeding device

Info

Publication number
JPH0958886A
JPH0958886A JP7240812A JP24081295A JPH0958886A JP H0958886 A JPH0958886 A JP H0958886A JP 7240812 A JP7240812 A JP 7240812A JP 24081295 A JP24081295 A JP 24081295A JP H0958886 A JPH0958886 A JP H0958886A
Authority
JP
Japan
Prior art keywords
paper
motor
paper feed
roller
feeding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7240812A
Other languages
Japanese (ja)
Other versions
JP3439887B2 (en
Inventor
Hiroyuki Baba
裕行 馬場
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 JP24081295A priority Critical patent/JP3439887B2/en
Publication of JPH0958886A publication Critical patent/JPH0958886A/en
Application granted granted Critical
Publication of JP3439887B2 publication Critical patent/JP3439887B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

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

Abstract

PROBLEM TO BE SOLVED: To eliminate energy consumption unnecessary for driving so as to reduce power expense charged to a user and to reduce cost by changing the torque of a paper feeding motor between the case of rotating a paper feed roller and the case of rotating a register roller. SOLUTION: Upon receiving a paper feeding signal, a control means sets the rotating speed of a paper feeding motor 7 to the rotating speed A. The paper feeding motor 7 is turned on, and a paper feeding clutch 6 is turned on to rotate a shaft 1a of a feed roller 1 by one rotation by torque imparted by a rotating speed A. Transfer paper in a cassette is thereby fed toward a register roller 5. When one rotation of the feed roller 1 is completed, a control signal is outputted to a motor driver so as to change the rotating speed of the paper feeding motor 7 to the rotating speed B. At this time, the paper feeding clutch 6 is switched so that driving force from the paper feeding motor 7 is not transmitted to the feed roller 1. The paper feeding motor 7 is rotated at the rotating speed B until the transfer paper is conveyed to the register roller 5 from a transfer paper separating part.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は複写機、ファクシミ
リ、プリンタ等の画像形成装置に用いられる給紙装置の
改良に関し、特に給紙トレイ等に積層された転写紙を一
枚づつ取り出す給紙コロと、該転写紙を画像形成部に所
定のタイミングで給紙するレジストローラを同一の駆動
源で駆動する場合に、給紙コロとレジストローラの駆動
に要する各エネルギーを効率よく分配して駆動に必要の
ないエネルギー消費をなくするようにした給紙装置を提
供することを目的としている。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a sheet feeding device used in an image forming apparatus such as a copying machine, a facsimile, a printer, etc., and more particularly, a sheet feeding roller for taking out the transfer sheets stacked in a sheet feeding tray etc. one by one. When the registration roller that feeds the transfer paper to the image forming unit at a predetermined timing is driven by the same drive source, each energy required for driving the paper feed roller and the registration roller is efficiently distributed and driven. It is an object of the present invention to provide a paper feeding device that eliminates unnecessary energy consumption.

【0002】[0002]

【従来の技術】複写機、ファクシミリ、プリンタ等の画
像形成装置は、作像部に給紙された転写紙上に画像形成
を行う機構を備えており、このような給紙のための手段
として給紙装置が装備されている。この給紙装置は、給
紙トレイ等の転写紙蓄積部から給紙コロを用いて転写紙
を一枚づつ取り出し、分離してから、作像部へ向けて送
り込み、作像部の手前側位置に配置したレジストローラ
により所定のタイミングにより転写紙を作像部へ給紙す
るようにしている。特開平1−218392号公報に
は、負荷トルクに応じてステッピングモータの駆動条件
を定めることにより、不要なトルクを生じさせずに、騒
音、振動を押え、消費電力や発熱を減少させるようにし
たステッピングモ−タの駆動装置が開示されている。し
かし、この従来例においては、ステッピングモ−タの駆
動装置にかかる負荷トルクを検知する検知手段を必要と
する点で製造コストが高くなるという欠点があった。
2. Description of the Related Art Image forming apparatuses such as copiers, facsimiles, printers, etc. are equipped with a mechanism for forming an image on a transfer sheet fed to an image forming section. Equipped with paper equipment. This paper feeding device takes out the transfer papers one by one from a transfer paper accumulating unit such as a paper feeding tray using a paper feeding roller, separates them, and then feeds them toward the image forming unit. The transfer roller is arranged to feed the transfer paper to the image forming section at a predetermined timing. In Japanese Patent Laid-Open No. 1-218392, the driving conditions of the stepping motor are determined according to the load torque, so that noise and vibration are suppressed and power consumption and heat generation are reduced without generating unnecessary torque. A drive device for a stepping motor is disclosed. However, this conventional example has a drawback that the manufacturing cost becomes high because a detecting means for detecting the load torque applied to the driving device of the stepping motor is required.

【0003】また、一般にコ−ナ爪分離方式の給紙装置
では、給紙コロを回転させる場合とレジストロ−ラを回
転させる場合の2つの駆動条件のみを考慮すればよく、
かつ各々の条件におけるトルクはほぼ一定である。この
給紙装置ではあらかじめ必要な大きさのトルクを調べて
おくことができ、該トルク値さえ確認しておけば、時間
的に変化する駆動条件のトルクを検知する必要がない。
さらにレジストロ−ラと給紙コロを駆動するための手段
として同一駆動モータを用いている場合、駆動用モ−タ
のトルクは、大きなトルクを必要とする方、即ち給紙コ
ロに合わせて設定される。即ち、給紙コロを用いたコ−
ナ爪分離方式の給紙装置では、給紙コロと転写紙との間
に給紙圧を与え、給紙コロの回転による搬送力を得てい
るが、このとき給紙コロの回転軸に対しては転写紙を積
載する底板からの押圧力により大きな負荷がかかるの
で、この負荷に抗して適正な給紙を行う為には大きな回
転トルクが必要となる。また、給紙カセットから送り出
された転写紙を、レジストロ−ラによって作像部に給紙
するために必要なモ−タのトルクは、前記給紙コロを回
転させるときに必要な回転トルクに比べて小さい。
Generally, in a corner claw separation type sheet feeding device, only two driving conditions for rotating the sheet feeding roller and for rotating the registration roller may be considered.
The torque under each condition is almost constant. With this paper feeding device, it is possible to check the required amount of torque in advance, and it is not necessary to detect the torque under drive conditions that change with time, as long as the torque value is confirmed.
Further, when the same drive motor is used as a means for driving the registration roller and the paper feed roller, the torque of the drive motor is set according to the one requiring a large torque, that is, the paper feed roller. It In other words,
In the paper feed device of the separation type, the paper feed pressure is applied between the paper feed roller and the transfer paper to obtain the conveying force by the rotation of the paper feed roller. However, since a large load is applied by the pressing force from the bottom plate on which the transfer sheets are stacked, a large rotational torque is required to properly feed the paper against this load. In addition, the motor torque required to feed the transfer paper sent from the paper feed cassette to the image forming unit by the registration roller is greater than the rotation torque required to rotate the paper feed roller. Small.

【0004】[0004]

【発明が解決しようとする課題】このように従来のコー
ナ爪分離方式の給紙装置に於ては、駆動用モ−タのトル
クとして大きなトルクを必要とする方、即ち給紙コロに
合わせて設定しているため、給紙コロを回転させるとき
に必要とされる大きさなトルクを用いてレジストロ−ラ
を駆動させることとなる。しかし、このように一律に設
定されたトルクは、レジストローラを駆動する為のトル
クとしては必要以上の大きさであるので、必要のない電
力をモ−タに供給してエネルギ−を無駄に消費する結果
を招来していた。本発明は上記に鑑みてなされたもので
あり、給紙コロとレジストローラを同一の駆動源により
駆動する構成を備えた給紙装置において、トルク検知手
段や、トルク検知のための制御回路を設けることなく、
負荷の大きい給紙コロを回転させる場合と、負荷の小さ
いレジストロ−ラを回転させる場合とで、給紙モ−タの
回転トルクを異ならせることにより、駆動に必要のない
エネルギ−消費を無くし、使用者が負担する電力費用を
減らし、更にコストダウンを図ることができる給紙装置
を提供することを目的としている。更に、トルクの大き
さによって回転数が規定されることにより給紙する速度
を任意の値に設定ができないという欠点をなくすること
ができる給紙装置を提供する。
As described above, in the conventional corner claw separation type sheet feeding device, the one that requires a large torque as the torque of the driving motor, that is, the sheet feeding roller, is selected. Since the setting is made, the resist roller is driven by using a large torque required to rotate the paper feed roller. However, since the torque set uniformly in this way is larger than necessary for driving the registration rollers, unnecessary electric power is supplied to the motor to wastefully consume energy. The result was to bring. The present invention has been made in view of the above, and is provided with a torque detection unit and a control circuit for torque detection in a sheet feeding device having a configuration in which a sheet feeding roller and a registration roller are driven by the same drive source. Without
By rotating the paper feed motor with a large load and rotating the registration roller with a small load, the rotational torque of the paper feed motor is made different to eliminate the energy consumption unnecessary for driving. It is an object of the present invention to provide a sheet feeding device that can reduce the power cost borne by the user and further reduce the cost. Further, the present invention provides a paper feeding device which can eliminate the drawback that the paper feeding speed cannot be set to an arbitrary value because the number of rotations is defined by the magnitude of torque.

【0005】[0005]

【課題を解決する為の手段】請求項1記載の発明は、転
写紙を取出し給紙するための給紙コロと、該給紙コロと
転写紙との間に給紙圧を与えるスプリングと、転写紙を
載置するための底板と、重送を防止するコ−ナ爪と、転
写紙を作像部に搬送するレジストロ−ラと、給紙コロの
回転軸に駆動力を伝える給紙クラッチと、給紙コロとレ
ジストロ−ラを駆動させる給紙モ−タと、該給紙モータ
を制御するモータドライバと、モータドライバ及び給紙
クラッチを制御する制御手段とを備えた給紙装置におい
て、上記制御手段は、給紙モ−タの回転数を変える機能
と、給紙モ−タの回転数を駆動時の条件に応じて切替え
る選択制御機能を備えていることを特徴とする。上記構
成を備えた結果、給紙コロを回転させる場合とレジスト
ロ−ラを回転させる場合で、給紙モ−タの回転トルクを
変えることにより、駆動に必要のないエネルギ−消費を
無くし、使用者が負担する電力費用を減らすことができ
る。また特開平1−218392公報記載の方法に比し
て、トルク検知手段と、そのための制御回路が不要であ
るのでコストダウンを図れる。
According to a first aspect of the present invention, there is provided a paper feed roller for taking out and feeding a transfer paper, and a spring for applying a paper feed pressure between the paper feed roller and the transfer paper. A bottom plate on which the transfer paper is placed, a corner claw that prevents double feeding, a registration roller that conveys the transfer paper to the image forming unit, and a paper feed clutch that transmits the driving force to the rotation shaft of the paper feed roller. In a paper feeding device including a paper feeding motor that drives a paper feeding roller and a registration roller, a motor driver that controls the paper feeding motor, and a control unit that controls the motor driver and the paper feeding clutch, The control means is provided with a function of changing the rotation speed of the paper feed motor and a selection control function of switching the rotation speed of the paper feed motor in accordance with driving conditions. As a result of providing the above configuration, by changing the rotation torque of the paper feeding motor between the case of rotating the paper feeding roller and the case of rotating the registration roller, the energy consumption unnecessary for driving is eliminated and the user Can reduce the cost of electricity. Further, as compared with the method disclosed in Japanese Patent Laid-Open No. 1-218392, the torque detecting means and the control circuit therefor are unnecessary, so that the cost can be reduced.

【0006】請求項2の発明は、転写紙を取出し給紙す
るための給紙コロと、該給紙コロと転写紙との間に給紙
圧を与えるスプリングと、転写紙を載置するための底板
と、重送を防止するコ−ナ爪と、転写紙を作像部に搬送
するレジストロ−ラと、給紙コロの回転軸に駆動力を伝
える給紙クラッチと、給紙コロとレジストロ−ラを駆動
する給紙モ−タと、該給紙モータを制御するモータドラ
イバと、該給紙モ−タの駆動電流を制御する機能とモー
タドライバ及び給紙クラッチを制御する機能を備えた制
御手段とを備えた給紙装置において、上記制御手段は、
上記給紙モ−タに流す電流を一定値に保持し、かつ該電
流を異なる値に切替える機能と、給紙モ−タに流す電流
の大きさを給紙モ−タの駆動条件に応じて切替える機能
とを備えている。請求項1の発明では、トルクの大きさ
で回転数が規定されるので、給紙する速度を任意の値に
設定することができないが、請求項2によれば、任意の
値に設定できる。
According to a second aspect of the present invention, a paper feed roller for taking out and feeding the transfer paper, a spring for applying a paper feed pressure between the paper feed roller and the transfer paper, and a transfer paper for mounting Bottom plate, corner claws that prevent double feeding, registration rollers that convey the transfer paper to the image forming unit, paper feed clutch that transmits the driving force to the rotation axis of the paper feed rollers, paper feed rollers and registration rollers. A sheet feeding motor for driving the sheet feeding motor, a motor driver for controlling the sheet feeding motor, a function for controlling the drive current of the sheet feeding motor, and a function for controlling the motor driver and the sheet feeding clutch. In a sheet feeding device including a control unit, the control unit is
A function of holding the current flowing through the paper feeding motor at a constant value and switching the current to a different value, and the magnitude of the current flowing through the paper feeding motor according to the driving conditions of the paper feeding motor. It has a switching function. In the invention of claim 1, since the rotation speed is defined by the magnitude of the torque, the feeding speed cannot be set to an arbitrary value, but according to claim 2, it can be set to an arbitrary value.

【0007】請求項3の発明は、転写紙を取出し給紙す
るための給紙コロと、該給紙コロと転写紙との間に給紙
圧を与えるスプリングと、転写紙を載置するための底板
と、重送を防止するコ−ナ爪と、転写紙を作像部に搬送
するレジストロ−ラと、給紙コロの回転軸に駆動力を伝
える給紙クラッチと、給紙コロとレジストロ−ラを駆動
する給紙モ−タと、該給紙モータを制御するモータドラ
イバと、給紙モ−タに印加する電圧を一定値に保つこと
ができかつ異なる大きさの電圧に切り替えることができ
る電源と、モータドライバ及び給紙クラッチを制御する
制御手段とを備えた給紙装置において、上記制御手段
は、回転トルクを変えるために給紙モ−タに印加する電
圧を変える機能と、上記給紙モ−タに印加する電圧を給
紙モ−タの駆動条件に応じて変える機能とを備えてい
る。請求項1の発明方法では、トルクの大きさで回転数
が規定されるので、給紙する速度を任意の値に設定する
ことができないが、請求項3によれば、任意の値に設定
できる。また請求項2の定電流駆動のモ−タの制御方法
に比べて、モ−タ制御が容易であり、また構成する回路
が簡単であることからコストダウンを図ることができ
る。
According to a third aspect of the present invention, a paper feed roller for picking up and feeding the transfer paper, a spring for applying a paper feed pressure between the paper feed roller and the transfer paper, and a transfer paper for placement. Bottom plate, corner claws that prevent double feeding, registration rollers that convey the transfer paper to the image forming unit, paper feed clutch that transmits the driving force to the rotation axis of the paper feed rollers, paper feed rollers and registration rollers. A sheet feeding motor for driving the sheet feeding motor, a motor driver for controlling the sheet feeding motor, and a voltage applied to the sheet feeding motor can be maintained at a constant value and can be switched to different voltage. In the paper feeding apparatus having a power source capable of controlling the motor driver and the paper feeding clutch, the control means has a function of changing the voltage applied to the paper feeding motor to change the rotation torque, The voltage applied to the paper feed motor is the drive condition for the paper feed motor. And a response to changing function. In the invention method of claim 1, since the number of rotations is defined by the magnitude of the torque, the feeding speed cannot be set to any value, but according to claim 3, it can be set to any value. . Further, as compared with the constant current driving motor control method according to the second aspect, the motor control is easier and the circuit is simple, so that the cost can be reduced.

【0008】[0008]

【発明の実施の形態】以下、本発明を添付図面に示した
実施例により詳細に説明する。図1は本発明の一実施例
の給紙装置の構成を示す縦断面図、図2は図1の給紙装
置の要部(駆動力伝達機構)の斜視図である。図3は該
給紙装置を駆動する為の制御系のシステムブロック図で
ある。図1、図2に示すように給紙装置は、転写紙を搬
送するための半月型の給紙コロ1と、給紙コロ1と転写
紙Pに給紙圧を与えるスプリング2と、転写紙を載置す
るための底板3と、重送を防止するコ−ナ爪4と、転写
紙Pを作像部Aに搬送するレジストロ−ラ対5と、給紙
コロ1の回転軸1aに駆動力を伝える給紙クラッチ6
と、給紙コロ1とレジストロ−ラ5を駆動させる給紙モ
−タ7と、給紙モ−タ7の駆動力を給紙クラッチ6に伝
達する歯車8等で構成されている。作像部Aは、ベルト
状感光体20、現像装置21、転写装備22等を有す
る。本発明の第1の実施例は、給紙モ−タの回転数を変
えることができる回転数切換え手段と、給紙モ−タの回
転数を駆動時の条件に応じて切替える選択制御手段を備
えたことを特徴としている。なお、ここで駆動時の条件
とは、例えば給紙コロによる給紙時と、レジストローラ
による給紙時を含むものである。また、回転数切換え手
段と選択制御手段を一つの制御部で実現してもよい。
BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a vertical cross-sectional view showing the configuration of a sheet feeding device according to an embodiment of the present invention, and FIG. 2 is a perspective view of a main part (driving force transmission mechanism) of the sheet feeding device of FIG. FIG. 3 is a system block diagram of a control system for driving the sheet feeding device. As shown in FIGS. 1 and 2, the sheet feeding device includes a half-moon-shaped sheet feeding roller 1 for conveying the transfer sheet, a sheet feeding roller 1 and a spring 2 that applies a sheet feeding pressure to the transfer sheet P, and a transfer sheet. A bottom plate 3 for mounting the sheet, a corner claw 4 for preventing double feeding, a pair of registration rollers 5 for conveying the transfer sheet P to the image forming section A, and a rotation shaft 1a of the sheet feeding roller 1. Paper feed clutch 6 that conveys power
A sheet feeding motor 7 for driving the sheet feeding roller 1 and the registration roller 5, and a gear 8 for transmitting the driving force of the sheet feeding motor 7 to the sheet feeding clutch 6. The image forming unit A includes a belt-shaped photoreceptor 20, a developing device 21, a transfer device 22, and the like. The first embodiment of the present invention comprises a rotation speed switching means capable of changing the rotation speed of the paper feed motor and a selection control means for switching the rotation speed of the paper feed motor according to driving conditions. It is characterized by having. Here, the driving condition includes, for example, a paper feeding by a paper feeding roller and a paper feeding by a registration roller. Further, the rotation speed switching means and the selection control means may be realized by one control unit.

【0009】図3に示した制御手段(選択制御手段)2
5は、給紙モータ7等の制御対象を制御するものであ
り、給紙モ−タ7の回転数を変える機能と、給紙モ−タ
の回転数を駆動時の条件で切替える機能を有する。周知
のようにモ−タの回転数とモ−タの回転トルクとの間に
は関係があり、回転数が低くなるほど、回転トルクは大
きくなる。そこで、本発明では、給紙コロ1を駆動する
場合には大きなトルクが必要であるためモ−タの回転数
を低くし、逆にレジストロ−ラを駆動しているときには
小さなトルクで十分であるためモ−タの回転数を上げる
ように制御を行う。即ち、給紙コロ1を回転させるため
に必要な最低限のトルクを与える給紙モ−タ7の回転数
を回転数Aとし、またジストロ−ラ5によって転写紙を
搬送するために必要なトルクを与える給紙モ−タの回転
数を回転数Bとする。この値はあらかじめシステムのR
OM内に格納されているとする。
Control means (selection control means) 2 shown in FIG.
Reference numeral 5 controls a control target such as the paper feed motor 7 and has a function of changing the rotation speed of the paper feed motor 7 and a function of switching the rotation speed of the paper feed motor according to driving conditions. . As is well known, there is a relationship between the rotation speed of the motor and the rotation torque of the motor. The lower the rotation speed, the larger the rotation torque. Therefore, in the present invention, a large torque is required to drive the sheet feeding roller 1, so that the rotation speed of the motor is lowered, and conversely, a small torque is sufficient when the registration roller is being driven. Therefore, control is performed so as to increase the rotation speed of the motor. That is, the number of rotations of the sheet feeding motor 7 that gives the minimum torque required to rotate the sheet feeding roller 1 is set to the number of rotations A, and the torque required to convey the transfer sheet by the gyroscope 5 is set. The number of rotations of the sheet feeding motor that gives the number of rotations is designated as the number of rotations B. This value is the R of the system beforehand
It is assumed that it is stored in the OM.

【0010】図4に本発明の第1の実施例に対応する制
御フロ−を示す。まず、図示しない操作部のスタートボ
タンがオンされたこと等により、給紙信号が入ると、制
御手段25(CPU)は給紙モ−タ7の回転数を回転数
Aに設定する(ステップ1、2)。つまり、給紙モータ
の回転数が回転数Aになるようにモータドライバに信号
を出力する。給紙モ−タ7がONし、つぎに給紙クラッ
チ6がONして、給紙コロ1の軸1aを回転数Aで与え
られるトルクにより1回転させる(ステップ3)。給紙
コロの軸1aには半月形状の給紙コロ1が取り付けられ
ており、軸1aの一回転によりカセット内の転写紙Pを
レジストローラへ向けて給紙する。給紙コロの一回転が
終了すると、つぎに給紙モ−タ7の回転数が回転数Bに
変わるように、モータドライバに制御信号を出力する
(ステップ4)。このとき給紙クラッチ6は給紙モータ
7からの駆動力が給紙コロに伝達されないように切り替
わる。給紙モ−タ7は、転写紙が転写紙分離部10から
レジストローラへ搬送されるまで、回転数Bで回転す
る。具体的には、レジストローラによりニップされた転
写紙の先端部が転写位置に達するまでは回転数Bで搬送
し、転写紙先端部が転写位置に達した以降は感光体と等
速(速度C)で回転する。転写紙後端部がレジストロー
ラを通過完了してから、転写紙先端部が転写位置に達す
るのであれば、レジストローラは回転数Bで回転し続け
ればよいが、レジストローラと転写位置までの距離が短
い場合には、転写紙先端部が転写位置に到達した時点で
転写紙後端部はレジストローラを抜け出ていないので、
上記のように速度を変更する必要が生じる。なお、第1
の実施例では、回転数A<回転数Bである。
FIG. 4 shows a control flow corresponding to the first embodiment of the present invention. First, when a paper feed signal is input because the start button of the operation unit (not shown) is turned on, the control means 25 (CPU) sets the rotation speed of the paper feed motor 7 to the rotation speed A (step 1). 2). That is, a signal is output to the motor driver so that the rotation speed of the paper feed motor becomes the rotation speed A. The paper feed motor 7 is turned on, then the paper feed clutch 6 is turned on, and the shaft 1a of the paper feed roller 1 is rotated once by the torque given by the rotational speed A (step 3). A half-moon shaped paper feed roller 1 is attached to the shaft 1a of the paper feed roller, and the transfer paper P in the cassette is fed toward the registration rollers by one rotation of the shaft 1a. When one rotation of the paper feed roller is completed, a control signal is output to the motor driver so that the rotation speed of the paper feed motor 7 is changed to the rotation speed B (step 4). At this time, the sheet feeding clutch 6 is switched so that the driving force from the sheet feeding motor 7 is not transmitted to the sheet feeding roller. The paper feed motor 7 rotates at the rotation speed B until the transfer paper is conveyed from the transfer paper separating section 10 to the registration rollers. Specifically, the transfer paper is conveyed at the number of rotations B until the leading end of the transfer paper nipped by the registration rollers reaches the transfer position, and after the leading end of the transfer paper reaches the transfer position, the speed is equal to that of the photoconductor (speed C). ) To rotate. If the front end of the transfer paper reaches the transfer position after the rear end of the transfer paper has completed passing through the registration roller, the registration roller may continue to rotate at the rotation speed B. If is short, the rear end of the transfer paper does not come out of the registration roller when the front end of the transfer paper reaches the transfer position.
It is necessary to change the speed as described above. The first
In the embodiment, the number of revolutions A <the number of revolutions B.

【0011】ところで、上記第1実施例の発明では、ト
ルクの大きさで回転数が規定されるので、回転数を高く
して搬送速度を速くしようとすると、トルクが失われ
る。つまり、給紙コロとレジストローラを夫々駆動する
時に、回転数を制御したとしても、給紙搬送速度を任意
の値に設定することができないが、次の実施例では、任
意の値に設定できる。即ち、本発明の第2の実施例で
は、給紙モ−タに流す電流を一定に保ち、かつ異なる電
流の大きさに切替える手段と、給紙モ−タに流す電流の
大きさをモ−タの駆動条件で切替える制御手段とを備え
たことを特徴としている。なお、ここでモータの駆動条
件とは、例えば給紙コロによる給紙時と、レジストロー
ラによる給紙時の各条件を含むものである。図3に示し
た制御手段25は、給紙モ−タに流す電流を一定に保
ち、かつ異なる電流の大きさに切替える機能と、給紙モ
−タに流す電流の大きさをモ−タの駆動条件で切替える
機能を備えている。
By the way, in the invention of the first embodiment, since the number of revolutions is defined by the magnitude of the torque, the torque is lost if the number of revolutions is increased to increase the conveying speed. That is, when the paper feed roller and the registration roller are respectively driven, even if the number of rotations is controlled, the paper feed / transport speed cannot be set to an arbitrary value, but in the following embodiment, it can be set to an arbitrary value. . That is, in the second embodiment of the present invention, a means for keeping the current flowing through the paper feed motor constant and switching to a different current magnitude and a magnitude for the current flowing through the paper feed motor are controlled. It is characterized in that it is provided with a control means for switching according to the driving condition of the data. Here, the driving conditions of the motor include, for example, each condition of the sheet feeding by the sheet feeding roller and the sheet feeding by the registration roller. The control means 25 shown in FIG. 3 has a function of keeping the current supplied to the paper feeding motor constant and switching to a different current size, and the size of the current supplied to the paper feeding motor. Equipped with a function to switch depending on the driving conditions.

【0012】即ち、一般にステッピングモ−タである給
紙モータ7のトルクの大小は該給紙モ−タに流す駆動用
の電流値の大小に依存しており、定電流駆動のステッピ
ングモ−タにあっては駆動電流値が大きいほどモ−タの
出力トルクが大きくなる。本実施例の給紙部の構成は上
記実施例と同様であるが、給紙モ−タ7に流す電流値を
一定に保ち、かつ異なる電流値に切替える電流値切換え
手段と、給紙モ−タに流す電流の大きさをモ−タの駆動
条件に応じて切替える制御手段とを備えることにより、
給紙コロを駆動する場合と、レジストローラを駆動する
場合の各電流値(トルク)を異ならせるようにした点が
特徴的である。例えば、給紙コロ1を回転させるために
必要な最低限のトルクAを電流A、またレジストロ−ラ
で転写紙を搬送するために必要なトルクBを電流Bで与
えることができるとする。これらの値はシステムのRO
Mにあらかじめ格納されている。
That is, the magnitude of the torque of the sheet feeding motor 7, which is generally a stepping motor, depends on the magnitude of the driving current value flowing through the sheet feeding motor, and is in the constant current driving stepping motor. As the drive current value increases, the motor output torque increases. The structure of the paper feeding unit of this embodiment is the same as that of the above embodiment, but the current value switching means for keeping the current value flowing through the paper feeding motor 7 constant and switching to different current values, and the paper feeding motor. By providing a control means for switching the magnitude of the current flowing through the motor according to the driving conditions of the motor,
A characteristic is that each current value (torque) when driving the paper feed roller and when driving the registration roller is made different. For example, it is assumed that the minimum torque A required for rotating the paper feed roller 1 can be given by the current A, and the torque B required for carrying the transfer paper by the registration roller can be given by the current B. These values are the RO of the system
Pre-stored in M.

【0013】図5に第2の実施例における制御フロ−の
例を示す。給紙信号が入ると、制御手段25(CPU)
は給紙モ−タ7を駆動する電流値を電流Aに設定するた
め、モ−タドライバに信号を送り、モ−タドライバは給
紙モ−タ7に電流Aを供給する(ステップ10、1
1)。CPUはその後給紙モ−タ7をONし、つぎに給
紙クラッチ6をONして、給紙コロ1の軸1aを電流A
で得られるトルクAにより1回転させる。給紙コロ1の
軸1aには半月形状の給紙コロ1が取り付けられてお
り、軸1aの回転によりカセット内の転写紙Pを給紙す
る。つぎにCPUは給紙モ−タ7に供給する電流を電流
Aから電流Bに切替えるようにモ−タドライバに信号を
送り、給紙モ−タ7に流れる電流を切替える。このと
き、クラッチ6により駆動トルクの伝達経路がレジスト
ローラ側へ切り替えられることは勿論である。上述のよ
うに、レジストローラと転写位置との間の距離が短い場
合には、給紙モ−タ7は給紙コロを抜け出た転写紙先端
部が転写位置に達するまでは電流Bにより得られるトル
クBで回転し、転写紙先端部が転写位置に達した後は感
光体と等速で回転させる。なお、第2の実施例では電流
A>電流Bである。この実施例では、駆動電流値を変更
することによりトルクを切り替えているので、給紙搬送
速度を任意の値に設定することが可能となる。
FIG. 5 shows an example of the control flow in the second embodiment. When a paper feed signal is input, the control means 25 (CPU)
Sends a signal to the motor driver to set the current value for driving the paper feeding motor 7 to the current A, and the motor driver supplies the current A to the paper feeding motor 7 (steps 10, 1).
1). After that, the CPU turns on the paper feed motor 7 and then turns on the paper feed clutch 6 so that the shaft 1a of the paper feed roller 1 is supplied with the current A.
One rotation is performed by the torque A obtained in step 1. A half-moon shaped paper feed roller 1 is attached to the shaft 1a of the paper feed roller 1, and the transfer paper P in the cassette is fed by the rotation of the shaft 1a. Next, the CPU sends a signal to the motor driver to switch the current supplied to the paper feeding motor 7 from the current A to the current B, and switches the current flowing to the paper feeding motor 7. At this time, it goes without saying that the clutch 6 switches the drive torque transmission path to the registration roller side. As described above, when the distance between the registration roller and the transfer position is short, the paper feed motor 7 is obtained by the current B until the leading end of the transfer paper that has exited the paper feed roller reaches the transfer position. It rotates with torque B, and after the leading edge of the transfer paper reaches the transfer position, it rotates at the same speed as the photoconductor. In the second embodiment, current A> current B. In this embodiment, since the torque is switched by changing the drive current value, it is possible to set the paper feed / transport speed to an arbitrary value.

【0014】次に、本発明の第3の実施例では、回転ト
ルクを変えるため給紙モ−タに印加する電圧を変えるこ
とができる電圧切換え手段と、前記給紙モ−タに印加す
る電圧をモ−タの駆動条件に応じて変える制御手段とを
備えたことを特徴としている。なお、ここでモータの駆
動条件とは、例えば給紙コロによる給紙時と、レジスト
ローラによる給紙時の各条件を含むものである。
Next, in a third embodiment of the present invention, a voltage switching means capable of changing the voltage applied to the paper feed motor to change the rotation torque, and the voltage applied to the paper feed motor. Is provided according to the driving condition of the motor. Here, the driving conditions of the motor include, for example, each condition of the sheet feeding by the sheet feeding roller and the sheet feeding by the registration roller.

【0015】図3の制御手段25は、回転トルクを変え
るため給紙モ−タに印加する電圧を変える機能と、前記
給紙モ−タに印加する電圧をモ−タの駆動条件に応じて
変える制御機能とを備える。即ち、ステッピングモ−タ
のトルクはモ−タに印加する電圧に依存しており、定電
圧駆動のステッピングモ−タにおいては、印加電圧が高
いほどモ−タの回転トルクも大きくなる。第3の実施例
の給紙部の構成は上記各実施例と同じであるが、回転ト
ルクを変えるため給紙モ−タに印加する電圧を変える手
段と、前記給紙モ−タに印加する電圧をモ−タの駆動条
件に応じて変える制御手段を有する点が特徴的である。
例えば、給紙コロ1を回転させるために必要な最低限の
トルクAは電圧A、またレジストロ−ラ5により転写紙
を搬送するために必要なトルクBは電圧Bで与えること
ができるとする。
The control means 25 of FIG. 3 has a function of changing the voltage applied to the paper feed motor in order to change the rotation torque, and the voltage applied to the paper feed motor according to the driving conditions of the motor. And a control function to change. That is, the torque of the stepping motor depends on the voltage applied to the motor, and in the constant voltage driving stepping motor, the higher the applied voltage, the larger the rotational torque of the motor. The structure of the sheet feeding portion of the third embodiment is the same as that of each of the above-described embodiments, but a means for changing the voltage applied to the sheet feeding motor in order to change the rotational torque and a means for applying the voltage to the sheet feeding motor. It is characteristic in that it has a control means for changing the voltage according to the driving condition of the motor.
For example, it is assumed that the minimum torque A required to rotate the paper feed roller 1 can be given by the voltage A, and the torque B required to convey the transfer paper by the registration roller 5 can be given by the voltage B.

【0016】図6に第3の実施例における制御フロ−の
例を示す。まず、給紙信号が入ると、制御手段25(C
PU)は給紙モ−タ7を駆動する電圧を電圧Aに設定す
るため、図3に示したPSU(Power Supply Unit ) に
制御信号を送り、PSUは、モ−タドライバを通して給
紙モ−タ7に供給される電圧を電圧Aに設定する(ステ
ップ20、21、22)。CPUはその後給紙モ−タを
ONし、つぎに給紙クラッチ6をONして、給紙コロ1
の軸1aを電圧Aで得られるトルクAで1回転させる。
給紙コロの軸には半月形状の給紙コロが取り付けられて
おり、軸1aの1回転によりカセット内の転写紙Pをレ
ジストローラへ向けて給紙する。つぎにCPUはPSU
に信号を送り、モ−タドライバを通して給紙モ−タ7に
供給する電圧を電圧Aから電圧Bに切替える(ステップ
23、24、25)。このとき、クラッチ6により駆動
トルクの伝達経路がレジストローラ側のみへ切り替えら
れることは勿論である。上述のように、レジストローラ
と転写位置との間の距離が短い場合には、給紙モ−タ7
は給紙コロを抜け出た転写紙先端部が転写位置に達する
までは電圧Bにより得られるトルクBで回転し、転写紙
先端部が転写位置に達した後は感光体と等速で回転させ
る。なお、第2の実施例では電圧A>電圧Bである。こ
の実施例では、駆動電圧値を変更することによりトルク
を切り替えているので、給紙搬送速度を任意の値に設定
することが可能となる。なお、上記実施例では給紙クラ
ッチ6がONして給紙コロを回転駆動している間中、レ
ジストローラが回転し続けているが、格別のクラッチを
設ける等の方法によってレジストローラの空回りを防止
するようにしてもよい。
FIG. 6 shows an example of the control flow in the third embodiment. First, when a paper feed signal is input, the control means 25 (C
(PU) sends a control signal to the PSU (Power Supply Unit) shown in FIG. 3 to set the voltage for driving the paper feed motor 7 to the voltage A, and the PSU sends the feed motor through the motor driver. The voltage supplied to 7 is set to voltage A (steps 20, 21, 22). After that, the CPU turns on the paper feed motor, then turns on the paper feed clutch 6 to feed the paper feed roller 1.
The shaft 1a is rotated once with the torque A obtained by the voltage A.
A half-moon shaped paper feed roller is attached to the shaft of the paper feed roller, and the transfer paper P in the cassette is fed toward the registration rollers by one rotation of the shaft 1a. Next, CPU is PSU
Signal to switch the voltage supplied to the paper feed motor 7 from the voltage A to the voltage B through the motor driver (steps 23, 24 and 25). At this time, of course, the clutch 6 switches the drive torque transmission path to only the registration roller side. As described above, when the distance between the registration roller and the transfer position is short, the paper feeding motor 7
Is rotated by a torque B obtained by the voltage B until the leading end of the transfer paper that has exited the paper feed roller reaches the transfer position, and is rotated at the same speed as the photoconductor after the leading end of the transfer paper reaches the transfer position. In the second embodiment, voltage A> voltage B. In this embodiment, since the torque is switched by changing the driving voltage value, it is possible to set the sheet feeding / conveying speed to an arbitrary value. In the above embodiment, the registration roller continues to rotate while the paper feeding clutch 6 is turned on and the paper feeding roller is rotationally driven. However, the idling of the registration roller can be prevented by providing a special clutch. It may be prevented.

【0017】[0017]

【発明の効果】請求項1記載の発明によれば、制御手段
は、給紙モ−タの回転数を変える機能と、給紙モ−タの
回転数を駆動時の条件に応じて切替える選択制御機能を
備えているので、給紙コロを回転させる場合とレジスト
ロ−ラを回転させる場合で、給紙モ−タの回転トルクを
変えることにより、駆動に必要のないエネルギ−消費を
無くし、使用者が負担する電力費用を減らすことができ
る。また特開平1−218392公報記載の方法に比し
て、トルク検知手段と、そのための制御回路が不要であ
るのでコストダウンを図れる。
According to the first aspect of the present invention, the control means has a function of changing the rotation speed of the paper feeding motor and a selection for switching the rotation speed of the paper feeding motor according to driving conditions. Since it has a control function, by changing the rotation torque of the paper feed motor when rotating the paper feed roller and when rotating the registration roller, the energy consumption unnecessary for driving is eliminated and used. It is possible to reduce the power cost to be paid by the person. Further, as compared with the method disclosed in Japanese Patent Laid-Open No. 1-218392, the torque detecting means and the control circuit therefor are unnecessary, so that the cost can be reduced.

【0018】請求項2の発明は、制御手段は、上記給紙
モ−タに流す電流を一定値に保持し、かつ該電流を異な
る値に切替える機能と、給紙モ−タに流す電流の大きさ
を給紙モ−タの駆動条件に応じて切替える機能とを備え
ているので、トルクの大きさで回転数が規定されること
がなく、給紙する速度を任意の値に設定することができ
る。
According to a second aspect of the present invention, the control means has a function of holding the current flowing through the paper feeding motor at a constant value and switching the current to a different value, and a function of the current flowing through the paper feeding motor. Since it has a function to switch the size according to the driving condition of the paper feeding motor, the speed of feeding is not specified by the magnitude of the torque, and the feeding speed can be set to an arbitrary value. You can

【0019】請求項3の発明は、制御手段は、回転トル
クを変えるために給紙モ−タに印加する電圧を変える機
能と、上記給紙モ−タに印加する電圧を給紙モ−タの駆
動条件に応じて変える機能とを備えているので、トルク
の大きさで回転数が規定されることがなく、給紙する速
度を任意の値に設定することができる。また、請求項2
の定電流駆動のモ−タの制御方法に比べて、モ−タ制御
が容易であり、また構成する回路が簡単であることから
コストダウンを図ることができる。
According to a third aspect of the invention, the control means has a function of changing the voltage applied to the paper feed motor to change the rotation torque, and the voltage applied to the paper feed motor is the paper feed motor. Since the number of rotations is not regulated by the magnitude of the torque, it is possible to set the feeding speed to an arbitrary value. In addition, claim 2
Compared with the constant current drive motor control method described in (1) above, the motor control is easier, and the cost is reduced due to the simple circuit configuration.

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

【図1】本発明の一実施例の給紙装置の縦断面図。FIG. 1 is a vertical sectional view of a sheet feeding device according to an embodiment of the present invention.

【図2】図1の給紙装置の要部構成を示す斜視図。FIG. 2 is a perspective view showing a main configuration of the paper feeding device of FIG.

【図3】本発明の制御系の一例の構成を示すブロック
図。
FIG. 3 is a block diagram showing a configuration of an example of a control system of the present invention.

【図4】第1の実施例の動作を示すフローチャート。FIG. 4 is a flowchart showing the operation of the first embodiment.

【図5】第2の実施例の動作を示すフローチャート。FIG. 5 is a flowchart showing the operation of the second embodiment.

【図6】第3の実施例の動作を示すフローチャート。FIG. 6 is a flowchart showing the operation of the third embodiment.

【符号の説明】[Explanation of symbols]

1 給紙コロ、2 スプリング、3 底板、4 コ−ナ
爪、5 レジストロ−ラ対、6 給紙クラッチ、7 給
紙モ−タ、8 歯車、20 ベルト状感光体、21 現
像装置、22 転写装備、25 制御手段。
1 sheet feeding roller, 2 springs, 3 bottom plate, 4 corner claws, 5 registration roller pair, 6 sheet feeding clutch, 7 sheet feeding motor, 8 gears, 20 belt-shaped photoreceptor, 21 developing device, 22 transfer Equipment, 25 control means.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 転写紙を取出し給紙するための給紙コロ
と、該給紙コロと転写紙との間に給紙圧を与えるスプリ
ングと、転写紙を載置するための底板と、重送を防止す
るコ−ナ爪と、転写紙を作像部に搬送するレジストロ−
ラと、給紙コロの回転軸に駆動力を伝える給紙クラッチ
と、給紙コロとレジストロ−ラを駆動させる給紙モ−タ
と、給紙モ−タを制御するモ−タドライバと、モータド
ライバ及び給紙クラッチを制御する制御手段とを備えた
給紙装置において、 上記制御手段は、給紙モ−タの回転数を変える機能と、
給紙モ−タの回転数を駆動時の条件に応じて切替える選
択制御機能を備えていることを特徴とする給紙装置。
1. A paper feed roller for taking out and feeding the transfer paper, a spring for applying a paper feed pressure between the paper feed roller and the transfer paper, a bottom plate for placing the transfer paper, and a weight. Corner nails to prevent feeding and registration rollers to convey the transfer paper to the image forming section
Motor, a paper feed clutch that transmits a driving force to the rotation axis of the paper feed roller, a paper feed motor that drives the paper feed roller and the registration roller, a motor driver that controls the paper feed motor, and a motor. In a paper feeding device having a driver and a control means for controlling the paper feeding clutch, the control means has a function of changing the rotation speed of the paper feeding motor,
A sheet feeding device having a selection control function for switching the number of rotations of the sheet feeding motor according to driving conditions.
【請求項2】 転写紙を取出し給紙するための給紙コロ
と、該給紙コロと転写紙との間に給紙圧を与えるスプリ
ングと、転写紙を載置するための底板と、重送を防止す
るコ−ナ爪と、転写紙を作像部に搬送するレジストロ−
ラと、給紙コロの回転軸に駆動力を伝える給紙クラッチ
と、給紙コロとレジストロ−ラを駆動する給紙モ−タ
と、該給紙モータを制御するモータドライバと、該給紙
モ−タの駆動電流を制御する機能と該モータドライバ及
び給紙クラッチを制御する機能を備えた制御手段とを備
えた給紙装置において、 上記制御手段は、上記給紙モ−タに流す電流を一定値に
保持し、かつ該電流を異なる値に切替える機能と、給紙
モ−タに流す電流の大きさを給紙モ−タの駆動条件に応
じて切替える機能とを備えていることを特徴とする給紙
装置。
2. A paper feed roller for taking out and feeding the transfer paper, a spring for applying a paper feed pressure between the paper feed roller and the transfer paper, a bottom plate for placing the transfer paper, and a weight. Corner nails to prevent feeding and registration rollers to convey the transfer paper to the image forming section
A sheet feeding clutch that transmits a driving force to the rotation shaft of the sheet feeding roller, a sheet feeding motor that drives the sheet feeding roller and the registration roller, a motor driver that controls the sheet feeding motor, and the sheet feeding roller. In a paper feeding apparatus having a function of controlling a driving current of a motor and a control means having a function of controlling the motor driver and the paper feeding clutch, the control means is a current supplied to the paper feeding motor. Is held at a constant value and the current is switched to a different value, and the magnitude of the current supplied to the paper feed motor is switched according to the drive condition of the paper feed motor. Characteristic paper feeding device.
【請求項3】 転写紙を取出し給紙するための給紙コロ
と、該給紙コロと転写紙との間に給紙圧を与えるスプリ
ングと、転写紙を載置するための底板と、重送を防止す
るコ−ナ爪と、転写紙を作像部に搬送するレジストロ−
ラと、給紙コロの回転軸に駆動力を伝える給紙クラッチ
と、給紙コロとレジストロ−ラを駆動する給紙モ−タ
と、該給紙モータを制御するモータドライバと、給紙モ
−タに印加する電圧を一定値に保つことができかつ異な
る大きさの電圧に切り替えることができる電源と、モー
タドライバ及び給紙クラッチを制御する制御手段とを備
えた給紙装置において、 上記制御手段は、回転トルクを変えるために給紙モ−タ
に印加する電圧を変える機能と、上記給紙モ−タに印加
する電圧を給紙モ−タの駆動条件に応じて変える機能と
を備えていることを特徴とする給紙装置。
3. A paper feed roller for taking out and feeding the transfer paper, a spring for applying a paper feed pressure between the paper feed roller and the transfer paper, a bottom plate for placing the transfer paper, and a weight. Corner nails to prevent feeding and registration rollers to convey the transfer paper to the image forming section
A sheet feeding clutch that transmits a driving force to the rotation shaft of the sheet feeding roller, a sheet feeding motor that drives the sheet feeding roller and the registration roller, a motor driver that controls the sheet feeding motor, and a sheet feeding motor. In a paper feeding device provided with a power source capable of maintaining a constant voltage applied to the input voltage and switching to a voltage of a different magnitude, and a control means for controlling a motor driver and a paper feeding clutch, the above control The means has a function of changing the voltage applied to the paper feed motor to change the rotation torque, and a function of changing the voltage applied to the paper feed motor according to the driving conditions of the paper feed motor. A paper feeding device characterized in that
JP24081295A 1995-08-25 1995-08-25 Paper feeder Expired - Fee Related JP3439887B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24081295A JP3439887B2 (en) 1995-08-25 1995-08-25 Paper feeder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24081295A JP3439887B2 (en) 1995-08-25 1995-08-25 Paper feeder

Publications (2)

Publication Number Publication Date
JPH0958886A true JPH0958886A (en) 1997-03-04
JP3439887B2 JP3439887B2 (en) 2003-08-25

Family

ID=17065060

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24081295A Expired - Fee Related JP3439887B2 (en) 1995-08-25 1995-08-25 Paper feeder

Country Status (1)

Country Link
JP (1) JP3439887B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004358893A (en) * 2003-06-06 2004-12-24 Canon Inc Recorder
US7780257B2 (en) 2003-06-06 2010-08-24 Canon Kabushiki Kaisha Recording apparatus and electronic apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004358893A (en) * 2003-06-06 2004-12-24 Canon Inc Recorder
US7780257B2 (en) 2003-06-06 2010-08-24 Canon Kabushiki Kaisha Recording apparatus and electronic apparatus

Also Published As

Publication number Publication date
JP3439887B2 (en) 2003-08-25

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