JP2010159117A5

JP2010159117A5 -

Info

Publication number: JP2010159117A5
Application number: JP2009001828A
Authority: JP
Filing date: 2009-01-07
Publication date: 2012-03-01
Anticipated expiration: 2029-01-07

Description

上記目的を達成するために、本発明の一側面としての搬送装置は、記録シートを搬送する搬送装置であって、前記記録シートの搬送路に配置され、前記記録シートを検出するラインセンサと、前記ラインセンサの出力に基づいて、前記記録シートの搬送方向に直交する幅方向における前記記録シートのエッジの位置を検出する検出手段と、前記記録シートを前記幅方向へシフトさせるシフト手段と、前記検出手段によって検出された前記記録シートのエッジの位置に基づいて、前記幅方向における前記記録シートのエッジの目標位置からのずれを示すシフト量及びシフト方向を算出する算出手段と、前記算出手段によって算出されたシフト量及びシフト方向に基づいて、前記幅方向における前記記録シートのエッジが前記目標位置に一致するように、前記シフト手段を制御する制御手段と、を有し、前記検出手段は、前記記録シートが前記ラインセンサの位置に搬送されていない状態での前記ラインセンサの出力レベルと、前記記録シートが前記ラインセンサの位置に搬送されている状態での前記ラインセンサがシートを検出している部分の出力レベルとの中間レベルを閾値として前記ラインセンサの出力を２値化して、２値化した値が変化する位置を前記記録シートのエッジの位置として検出し、前記記録シートが前記ラインセンサの位置を搬送されている間に前記記録シートのエッジの位置の検出を複数回実行する場合において、当該複数回の検出のそれぞれの検出において前記ラインセンサがシートを検出している部分の出力レベルに基づいてそれぞれの検出の次の検出における閾値を決定することを特徴とする。 To achieve the above object, the transport apparatus according to one aspect of the present invention, there is provided a conveying device for conveying the recording sheet, it is disposed to the transport path of the recording sheet, and Lula-sensor to detect the recording sheet Detecting means for detecting the position of the edge of the recording sheet in the width direction orthogonal to the conveyance direction of the recording sheet based on the output of the line sensor; and shifting means for shifting the recording sheet in the width direction; Calculation means for calculating a shift amount and a shift direction indicating a deviation from the target position of the edge of the recording sheet in the width direction based on the position of the edge of the recording sheet detected by the detection means; and the calculation means The edge of the recording sheet in the width direction matches the target position based on the shift amount and shift direction calculated by Sea urchin, and a control means for controlling said shifting means, said detecting means, an output level of said line sensor in a state where the recording sheet is not conveyed to the position of the line sensor, the recording sheet A value obtained by binarizing the output of the line sensor with the intermediate level of the output level of the portion where the line sensor is detecting the sheet being conveyed to the position of the line sensor as a threshold value Is detected as the position of the edge of the recording sheet, and the detection of the position of the edge of the recording sheet is performed a plurality of times while the recording sheet is being conveyed through the position of the line sensor. All the subsequent detection of the respective detecting the line sensor at each of the detection of a plurality of detection based on the output level of the part that detects the sheet And determining a that threshold.

Claims

A conveying device for conveying a recording sheet,
Disposed to the transport path of the recording sheet, and Lula-sensor to detect the recording sheet,
Detecting means for detecting the position of the edge of the recording sheet in the width direction orthogonal to the conveying direction of the recording sheet, based on the output of the line sensor;
Shift means for shifting the recording sheet in the width direction;
Calculation means for calculating a shift amount and a shift direction indicating a deviation from the target position of the edge of the recording sheet in the width direction based on the position of the edge of the recording sheet detected by the detection means;
Control means for controlling the shift means based on the shift amount and the shift direction calculated by the calculation means so that the edge of the recording sheet in the width direction matches the target position;
Have
The detection means includes an output level of the line sensor in a state where the recording sheet is not conveyed to the position of the line sensor, and the line sensor in a state where the recording sheet is conveyed to the position of the line sensor. Binarizes the output of the line sensor with an intermediate level from the output level of the portion where the sheet is detected as a threshold, and detects the position where the binarized value changes as the edge position of the recording sheet,
When the detection of the position of the edge of the recording sheet is performed a plurality of times while the recording sheet is being conveyed through the position of the line sensor, the line sensor detects the sheet in each detection of the plurality of detections. A threshold value in the next detection of each detection is determined on the basis of the output level of the portion being operated.

An output level of the line sensor in a state where the recording sheet is not conveyed to the position of the line sensor, and an output level of a portion where the line sensor detects the sheet in each of the detections of the plurality of times. The transport apparatus according to claim 1, wherein the intermediate level is set as a threshold value in the next detection after each detection.

The detection means includes an output level when the recording sheet is not conveyed to the position of the line sensor and the line sensor detects a conveyance path of the recording sheet, and an output of the line sensor is equal to or higher than a set value. The output of the line sensor is binarized using an intermediate level with the output level of the line sensor at a pixel position that is a predetermined distance away from the position of the pixel as a threshold, and the binarized value changes. The transport apparatus according to claim 1, wherein the position is detected as a position of an edge of the recording sheet.

The set value is an intermediate level between the output level when the line sensor detects the conveyance path of the recording sheet and the output level when the line sensor detects the recording sheet before the plurality of detections. The conveyance device according to claim 3, wherein

An image forming apparatus for forming an image on a recording sheet,
A conveying device according to any one of claims 1 to 4, which conveys the recording sheet;
Image forming means for forming an image on a recording sheet conveyed by the conveying device;
An image forming apparatus comprising:

Disposed to the transport path of the recording sheet includes a detection to Lula-sensor of the recording sheet, a method of controlling a transfer device for transferring the recording sheet,
A detection step of detecting the position of the edge of the recording sheet in the width direction orthogonal to the conveyance direction of the recording sheet, based on the output of the line sensor;
A calculation step of calculating a shift amount and a shift direction indicating a deviation from a target position of the edge of the recording sheet in the width direction based on the position of the edge of the recording sheet detected in the detection step;
A control step for controlling the shift of the recording sheet in the width direction so that the edge of the recording sheet in the width direction matches the target position based on the shift amount and the shift direction calculated in the calculation step; ,
Have
In the detection step, the output level of the line sensor when the recording sheet is not conveyed to the position of the line sensor, and the line sensor when the recording sheet is conveyed to the position of the line sensor. Binarizes the output of the line sensor with an intermediate level from the output level of the portion where the sheet is detected as a threshold, and detects the position where the binarized value changes as the edge position of the recording sheet,
When the detection of the position of the edge of the recording sheet is performed a plurality of times while the recording sheet is being conveyed through the position of the line sensor, the line sensor detects the sheet in each detection of the plurality of detections. And determining a threshold value for the next detection after each detection based on the output level of the portion being operated .