发明授权
- 专利标题: Method and apparatus for media height sensing
- 专利标题(中): 介质高度检测方法和装置
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申请号: US09685157申请日: 2000-10-10
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公开(公告)号: US06625561B1公开(公告)日: 2003-09-23
- 发明人: Barclay J Tullis
- 申请人: Barclay J Tullis
- 主分类号: H04N104
- IPC分类号: H04N104
摘要:
The present invention employs an inexpensive method and apparatus for media height sensing. A sheet fed media-using-machine has a media holder. The media holder holds a stack of a variable quantity of sheets of a medium to be supplied to a media-using-machine. The media holder has a structure for supporting the sheets and has a stack pusher which may be a mechanical device that pushes the stack into a position such that said media-using-machine may withdraw the sheets from said stack. The stack pusher has a variable position within a range of motion wherein such position is dependent upon a quantity of sheets in the stack. A variable device is attached to the stack pusher such that an electrical property of said variable device varies in relation to said position thereby allowing calculation of an estimate of the quantity of sheets in said stack, where the calculation is performed using said electrical property. The variable device may be, for example, a capacitor or a resistor, and the electrical property being capacitance or resistance, respectively.
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