Apparatus and method for measuring a dimension of an object
    1.
    发明授权
    Apparatus and method for measuring a dimension of an object 失效
    用于测量物体尺寸的装置和方法

    公开(公告)号:US6164639A

    公开(公告)日:2000-12-26

    申请号:US227233

    申请日:1999-01-08

    摘要: A method and apparatus for measuring a dimension of an object which utilizes a reflective photosensor and a facing reflective surface, wherein the spacing between the sensor and the reflective surface is varied depending on the dimension to be measured. The preferred application of the invention is in a sheet feeder for a printer wherein the invention provides an electrical signal indicative of the size of sheets in the sheet feeder. The electrical signal may be used to control a printing function. The sheet feeder (10) includes a base (14) having a paper guide (18) slideably mounted thereon. The guide (18) carries a tapered arm (26) which includes a reflective surface (28). A reflective photosensor (30) is fixedly mounted on the base opposite the reflective surface (28) such that the variable distance between the sensor (30) and the surface (28) as the paper guide (18) is adjusted gives a correspondingly variable electrical output from the sensor. When the sensor (30) is adjusted against the edge of a stack of sheets, the sensor's output represents a dimension of those sheets.

    摘要翻译: 一种用于测量物体的尺寸的方法和装置,其利用反射光电传感器和面对的反射表面,其中传感器和反射表面之间的间距根据待测量的尺寸而变化。 本发明的优选应用在用于打印机的片材进给器中,其中本发明提供了指示片材进给器中片材尺寸的电信号。 电信号可用于控制打印功能。 片材进给器(10)包括具有可滑动地安装在其上的纸张引导件(18)的基座(14)。 引导件(18)承载包括反射表面(28)的锥形臂(26)。 反射光电传感器(30)固定地安装在与反射表面(28)相对的基座上,使得传感器(30)和作为纸引导件(18)的表面(28)之间的可变距离被调节,从而给出相应可变的电气 从传感器输出。 当传感器(30)相对于一叠纸张的边缘进行调整时,传感器的输出表示这些纸张的尺寸。