JP2010132412A5

JP2010132412A5 -

Info

Publication number: JP2010132412A5
Application number: JP2008309962A
Authority: JP
Filing date: 2008-12-04
Publication date: 2012-01-19
Anticipated expiration: 2028-12-04

Description

上記問題を解決するため、本発明の画像読取装置は、昇降可能なトレイに積載された原稿を最上位から一枚づつ給送し、給送された原稿の画像を順次読み取る原稿読取動作を行う原稿読取装置において、前記トレイに積載された原稿のうちの最上位の原稿の位置に応じた信号を出力する検知部と、前記トレイを昇降させる駆動力を発生するモータと、前記モータからの駆動力を前記トレイへ伝達するための伝達機構と、前記検知部からの信号に基づいて前記モータの動作を制御する制御部と、を備え、前記制御部は、前記原稿読取動作の開始時に、前記検知部からの信号によって最上位の原稿が給送位置に達したと判断するまで前記トレイを上昇させる初期上昇動作を実行し、前記原稿読取動作の実行中に前記検知部からの信号に基づいて最上位の原稿が前記給送位置より下方に位置したと判断したら前記トレイを上昇させるように前記モータを所定量だけ駆動するように制御し、前記制御部は、前記原稿読取動作の開始時、前記検知部からの信号に基づいて最上位の原稿が前記給送位置より高い位置であると判断した場合に、前記初期上昇動作を行わずに前記原稿読取動作を開始するとともに、前記原稿読取動作の実行中、前記検知部からの出力に基づいて最初に最上位の原稿の位置が前記給送位置より下方に位置したと判断したことに応じて前記伝達機構による前記トレイへの駆動の伝達が保証されるだけ前記トレイを上昇させる方向に前記モータを駆動させることを特徴とする。
In order to solve the above problem, the image reading apparatus according to the present invention performs a document reading operation of feeding documents stacked on a tray that can be raised and lowered one by one from the top and sequentially reading the images of the fed documents. In the document reading device, a detection unit that outputs a signal corresponding to the position of the uppermost document among the documents stacked on the tray, a motor that generates a driving force for moving the tray up and down, and a drive from the motor A transmission mechanism for transmitting force to the tray, and a control unit for controlling the operation of the motor based on a signal from the detection unit, the control unit at the start of the document reading operation, An initial raising operation for raising the tray is performed until it is determined by the signal from the detection unit that the uppermost document has reached the feeding position, and based on the signal from the detection unit during the document reading operation. Most When it is determined that the original is positioned below the feeding position, the motor is controlled so as to drive the motor by a predetermined amount so as to raise the tray. When it is determined that the uppermost document is higher than the feeding position based on a signal from the detection unit, the document reading operation is started without performing the initial ascending operation, and the document reading operation During execution, the transmission of the drive to the tray by the transmission mechanism is guaranteed when it is first determined that the position of the uppermost document is positioned below the feeding position based on the output from the detection unit. The motor is driven in a direction to raise the tray as much as possible.

Claims

In a document reading apparatus that performs a document reading operation of feeding documents loaded on a liftable tray one by one from the top, and sequentially reading images of the fed documents ,
A detection unit that outputs a signal corresponding to the position of the topmost document among the documents stacked on the tray;
A motor that generates a driving force to raise and lower the tray;
A transmission mechanism for transmitting the driving force from the motor to the tray;
A control unit for controlling the operation of the motor based on a signal from the detection unit,
The control unit performs an initial raising operation of raising the tray until it is determined that the uppermost document has reached the feeding position by a signal from the detection unit at the start of the document reading operation, and the document reading is performed. When it is determined that the uppermost document is positioned below the feeding position based on a signal from the detection unit during the operation, the motor is controlled to be driven by a predetermined amount so as to raise the tray. ,
If the control unit determines that the uppermost document is higher than the feeding position based on a signal from the detection unit at the start of the document reading operation, the control unit does not perform the initial ascending operation. In response to starting the original reading operation and determining that the position of the uppermost original document is first positioned below the feeding position based on the output from the detection unit during the execution of the original reading operation. An original reading apparatus, wherein the motor is driven in a direction to raise the tray as long as transmission of driving to the tray by the transmission mechanism is guaranteed.

A sensor for detecting that the tray is at the lower limit position;
The control unit causes the tray to descend based on the detection of the sensor after the feeding of the stacked originals is completed,
When the document reading operation is started without performing the initial ascending operation, the control unit first determines the position of the uppermost document based on the output from the detection unit during the execution of the document reading operation. 2. The document according to claim 1, wherein when the tray is raised in response to the determination that the tray is located below the feeding position, the raising of the tray is stopped based on detection of the sensor. Reader.

An arm that is provided in the transmission mechanism and abuts on the tray and raises the tray by a driving force from the motor;
A sensor that outputs a signal corresponding to the position of the arm,
At the start of the document reading operation, when it is determined that the uppermost document is higher than the feeding position based on a signal from the detection unit, the output from the detection unit is output during the document reading operation. Based on the output from the sensor, the control unit stops the raising of the tray when it is first determined that the position of the uppermost document is positioned below the feeding position. The document reading device according to claim 1.

In a document reading apparatus that performs a document reading operation of feeding documents loaded on a liftable tray one by one from the top, and sequentially reading images of the fed documents ,
A detection unit that outputs a signal corresponding to the position of the uppermost document among the documents stacked on the tray, a motor that generates a driving force to raise and lower the tray, and a driving force from the motor to the tray. A transmission mechanism for transmitting, a control unit for controlling the operation of the motor based on a signal from the detection unit, and a sensor for detecting that the tray is at a lower limit position,
When the control unit determines that the uppermost document is located below the feeding position based on a signal from the detection unit during the document reading operation, the control unit controls the motor to raise the tray. After controlling to drive only a fixed amount and feeding of the loaded document, the lowering operation of the tray based on the detection of the sensor is executed,
When the control unit determines that the position of the uppermost document is located below the feeding position based on the output from the detection unit during the document reading operation, the control unit performs the operation according to the signal from the sensor. An original reading apparatus, wherein when the tray is determined to be in a lower limit position, the motor is driven to raise the tray and the driving of the motor is stopped based on the output of the sensor.

A feeding rotating body for feeding a document in contact with the topmost document;
A moving member that holds the feeding rotating body and moves the feeding rotating body to a contact position in contact with the uppermost document and a retracted position retracted from the uppermost document;
The moving member moves so that the feeding rotating body moves between the contact position and the retracted position each time a document is sent out,
The detection unit detects the position of the moving member, and the control unit determines the position of the uppermost document based on a signal from the detection unit when the moving member moves to the contact position. The document reading device according to claim 1, wherein the document reading device is a document reading device.