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    • 41. 发明授权
    • Method and apparatus for detecting double fed sheets
    • 检测双馈片材的方法和装置
    • US5437445A
    • 1995-08-01
    • US970671
    • 1992-10-08
    • Sung S. ChangMark A. GilbertieAndrei Obrea
    • Sung S. ChangMark A. GilbertieAndrei Obrea
    • B65H7/12
    • B65H7/12B65H2511/11B65H2511/13B65H2511/514B65H2511/524B65H2553/41B65H2701/1311B65H2701/1313B65H2701/1912
    • A method and apparatus for detecting double fed sheets. A sheet passes beneath a roller which is mounted on a lever so that the opposite end of the lever is deflected by an amount proportional to the thickness of the sheet. A magnet is attached to the opposite end of the lever approximate to a Hall Effect sensor fixed to the frame of the apparatus so that the hall sensor produces a signal proportional to the thickness of the sheet. The output of the hall sensor is sampled by an A/D convertor and the signals are input to a computer for processing to detect double fed sheets. Average thicknesses for subsequences of samples distributed over the sheet are computed and compared to reference levels. The length of the sheet is also compared to a reference length. If, for any of these comparisons the measured values are greater than the references a doubled detect signal is generated. In one embodiment leading and trailing edges of the sheet may be detected by detecting transitions in the sequence of signals which are greater than the design minimum sheet thickness. In another embodiment of the subject invention the reference levels are established by first measuring a selected, assured single, initial sheet. In another embodiment of the subject invention the references are updated after each sheet by combining a portion of the previous reference value, preferably 7/8th's, with a portion, preferably 1/8th, of the measure value multiplied by an appropriate scale factor.
    • 一种用于检测双馈片材的方法和装置。 纸张通过安装在杠杆上的辊子下方,使得杠杆的相对端部偏转与纸张厚度成比例的量。 磁铁安装在杠杆的相对端,靠近固定在装置框架上的霍尔效应传感器,使得霍尔传感器产生与纸张厚度成比例的信号。 霍尔传感器的输出由A / D转换器采样,并将信号输入计算机进行处理以检测双馈纸张。 计算分布在片材上的样品的子序列的平均厚度,并与参考水平进行比较。 纸张的长度也与参考长度进行比较。 如果对于这些比较中的任一个,测量值大于参考值,则生成双重检测信号。 在一个实施例中,片材的前缘和后缘可以通过检测大于设计最小片材厚度的信号序列中的转变来检测。 在本发明的另一个实施例中,通过首先测量选定的,确保的单个初始片材来建立参考水平。 在本发明的另一个实施例中,通过将先前的参考值的一部分,优选地7 / 8th与测量值乘以适当的比例因子的一部分,优选地1/8的组合来在每张纸上更新参考。