Image reader, image forming device having the same, and computer-readable storage medium for the same

An image forming device comprising:

• an image reader configured to read an image of a document sheet and generate image data based on the read image;
• and
• an image forming unit configured to form an image based on the image data generated by the image reader,
• wherein the image reader comprises:
• a feeder configured to feed the document sheet to a document reading position;
• a first reading sensor configured to read an image;
• a first reference member;
• a moving mechanism configured to move the first reading sensor to the document reading position to read the image of the document sheet fed by the feeder and a reference reading position to read an image of the first reference member;
• a controller configured to:
• control the moving mechanism to move the first reading sensor to the reference reading position;
• control the first reading sensor to read the image of the first reference member in the reference reading position;
• and
• control the moving mechanism to move the first reading sensor to the document reading position after the first reading sensor reads the image of the first reference member;
• and
• a detector configured to detect the document sheet which is being fed by the feeder to the image reading position;
• wherein the controller controls the feeder to start feeding the document sheet to the document reading position before the first reading sensor reaches the document reading position from the reference reading position,
• wherein based on a first time when the detector detects the document sheet, the controller determines a second time when the document sheet fed by the feeder reaches the document reading position,
• wherein the controller determines a third time when the first reference member is to be read by the first reading sensor, based on the second time and a first time period, the first time period including:
• a second time period taken for the first reading sensor to read the image of the first reference member;
• and
• a third time period taken for the first reading sensor to move from the reference reading position to the document reading position, and
• wherein the controller controls the first reading sensor to read the image of the first reference member at the third time.

A computer-readable storage medium storing computer-readable instructions for controlling an image reader which comprises:

• a feeder configured to feed a document sheet to a document reading position;
• a first reading sensor configured to read an image;
• a first reference member;
• a moving mechanism configured to move the first reading sensor to the document reading position to read an image of the document sheet fed by the feeder and a reference reading position to read an image of the first reference member;
• and
• a detector configured to detect the document sheet which is being fed by the feeder to the image reading position;
• the instructions, when executed by a processor, causing the processor to:
• control the moving mechanism to move the first reading sensor to the reference reading position;
• control the first reading sensor to read the image of the first reference member in the reference reading position;
• and
• control the moving mechanism to move the first reading sensor to the document reading position after the first reading sensor reads the image of the first reference member,
• wherein the instructions further cause the processor to control the feeder to start feeding the document sheet to the document reading position before the first reading sensor reaches the document reading position from the reference reading position,
• wherein based on a first time when the detector detects the document sheet, the controller determines a second time when the document sheet fed by the feeder reaches the document reading position,
• wherein the controller determines a third time when the first reference member is to be read by the first reading sensor, based on the second time and a first time period, the first time period including:
• a second time period taken for the first reading sensor to read the image of the first reference member;
• and
• a third time period taken for the first reading sensor to move from the reference reading position to the document reading position, and
• wherein the controller controls the first reading sensor to read the image of the first reference member at the third time.