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发明授权
CN101114139B 图像形成设备 失效 - 权利终止

图像形成设备
摘要：
本发明提供一种图像形成设备，当后沿检测传感器受到附着在其光路上的调色剂、灰尘等的影响时，或者当传感器发生故障时，通过仅利用用于检测前沿的单元来测量记录材料的尺寸，从而防止所述设备发生故障。该图像形成设备具有适合于检测记录材料前沿的用于前沿检测的单元以及适合于检测记录材料后沿的用于后沿检测的单元，并且该图像形成设备配置成当用于后沿检测的单元的检测能力降低或出现故障时，仅利用用于前沿检测的单元来形成图像和测量记录材料的尺寸。
摘要（英）：

When a trailing edge detection sensor is affected by toner, dust, etc. adhered on an optical path thereof or when the sensor fails, malfunction of the apparatus is prevented from happening by measuring the size of a record material only with a unit for detecting a leading edge. The image forming apparatus has a unit for leading edge detection adapted to detect the leading edge of the record material and a unit for trailing edge detection adapted to detect the trailing edge of the record material, and is configured to, when the unit for trailing edge detection falls in detection capability or fails, form an image and measure the size of the record material only with the unit for leading edge detection.

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