公开(公告)号：US06435641B1

公开(公告)日：2002-08-20

申请号：US09651698

申请日：2000-08-30

申请人： Victor Tung ,  Pierre Joseph Kaiser ,  Matthew A. Shepherd

发明人： Victor Tung ,  Pierre Joseph Kaiser ,  Matthew A. Shepherd

IPC分类号： B41J2938

CPC分类号： B41J11/42 ,  B41J11/0095

摘要： An embodiment of a media movement apparatus is used to detect an edge of a unit of media in a media path in an inkjet printer using an optical sensor. When the inkjet printer is operating in a mode in which units of media are continuously moved into the media path, a mechanical sensor will not reliably allow detection of the leading edge of a unit of media. Determining the location of the leading edge of the unit of media is done to correctly place an image on the unit of the media. After ejecting the previous unit of the media into an output tray, the current unit of the media is moved backward in the media path while measuring the output of an optical sensor. If the edge is detected while moving backward, the current unit of the media is moved to the input side of a print zone. If the edge is not detected and the optical sensor indicates the presence of media, a media jam is indicated. If the edge is not detected and the optical sensor indicates the absence of media, the current unit of the media is moved forward while measuring the output of the optical sensor to detect the edge. If the edge is detected, then the current unit of the media is moved forward a predetermined distance. Next, the current unit of the media is moved backward in the media path while measuring the output of the optical sensor.

摘要翻译： 媒体移动装置的一个实施例用于使用光学传感器来检测喷墨打印机中的介质路径中的介质单元的边缘。 当喷墨打印机以介质单元连续移动到介质路径中的方式操作时，机械传感器将不可靠地允许检测介质单元的前缘。 确定介质单元前端的位置可以将图像正确放置在介质单元上。 在将前一单元的介质弹出到输出托盘之后，当测量光学传感器的输出时，介质的当前单元在介质路径中向后移动。 如果在向后移动时检测到边缘，则介质的当前单位将移动到打印区域的输入侧。 如果未检测到边缘，并且光学传感器指示介质的存在，则会显示介质堵塞。 如果未检测到边缘，并且光学传感器指示不存在介质，则在测量光学传感器的输出以检测边缘时，介质的当前单位向前移动。 如果检测到边缘，则介质的当前单元向前移动预定距离。 接下来，当测量光学传感器的输出时，介质的当前单元在媒体路径中向后移动。