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    • 1. 发明授权
    • Length measurement apparatus and image forming apparatus
    • 长度测量装置和图像形成装置
    • US08320814B2
    • 2012-11-27
    • US12775238
    • 2010-05-06
    • Kazuyuki TsukamotoTakao FuruyaMinoru OshimaYoshinari Iwaki
    • Kazuyuki TsukamotoTakao FuruyaMinoru OshimaYoshinari Iwaki
    • G03G15/00G01B5/02B65H7/02
    • G03G15/65G03G2215/00734
    • A length measurement apparatus including: a measurement portion that measures a sheet length based on a rotational amount of a length measurement roll for a first detection period in which first and third sensors detect the sheet, and a sheet length based on a rotational amount of the length measurement roll for a second detection period in which the second sensor and any one of the first and third sensors detect the sheet, the any one of the first and third sensors being disposed at a position opposite to the second sensor via the length measurement roll; and a whole length calculation portion that selects the sheet length nearer to integral multiples of the circumference length of the length measurement roll from the sheet lengths measured for the first and second detection periods, and calculates the whole length of the sheet by using the selected sheet length.
    • 一种长度测量装置,包括:测量部分,其测量基于第一和第三传感器检测纸张的第一检测周期的长度测量辊的旋转量的纸张长度,以及基于所述纸张长度的转印量 长度测量辊,用于第二检测周期,其中第二传感器和第一和第三传感器中的任何一个检测纸张,第一和第三传感器中的任何一个经由长度测量辊设置在与第二传感器相对的位置 ; 以及整体长度计算部分,从对于第一和第二检测周期测量的纸张长度中选择更接近长度测量辊的圆周长度的整数倍的纸张长度,并且通过使用所选择的纸张来计算纸张的整个长度 长度。