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    • 41. 发明授权
    • Method of cut position determination for printing machines
    • 打印机切割位置确定方法
    • US4896605A
    • 1990-01-30
    • US307753
    • 1989-02-08
    • Thomas Schroder
    • Thomas Schroder
    • B41F13/54B26D5/30B41F13/02B41F33/06B65H23/18B65H23/188
    • B65H23/1886B41F13/025B65H2301/4148B65H2701/1864
    • A method of cut position determination for printing machines, wherein in order to ensure a synchronous running of the paper webs (P1-P4) to be folded and cut into newspapers (16) on a printing machine for rotary offset printing or rotary letter press printing, main and secondary registers (5, 7) are controlled in their position by means of servomotors (M1-M4) as a function of actuating signals (S.sub.M1 -S.sub.M4). Above each former-introduction guide roller (10), 4 photocells (11) are arranged equally spaced next to one another, which detect brightness signals (H.sub.A1 -H.sub.D4) from the printed surface of these paper webs at a scanning frequency of 20 khz. These brightness signals are subjected to a Fourier analysis in a microprocessor. The fundamental oscillation is evaluated, the fundamental oscillation with the greatest amplitude being selected from the 4 fundamental oscillations of each paper web. The phase position signal associated with the selected fundamental oscillation is used for calculation of one of the actuating signals (S.sub.M1 -S.sub.M4). Consequently, the cut position of the paper webs (P1-P4) can be determined without socalled register marks or register-keeping marks made on them.
    • 一种用于印刷机的切割位置确定方法,其中为了确保纸幅(P1-P4)在打印机上进行折叠和切割成报纸(16)的同步运行,用于旋转胶印或旋转字母印刷 通过作为启动信号(SM1-SM4)的函数的伺服电机(M1-M4)将主和次级寄存器(5,7)控制在其位置。 在每个前引导导辊(10)上方,4个光电管(11)彼此相等地排列,以20khz的扫描频率从这些纸幅的印刷表面检测亮度信号(HA1-HD4)。 这些亮度信号在微处理器中进行傅立叶分析。 评估基本振荡,最大振幅的基波振荡从每个纸幅的4个基本振荡中选择。 与所选择的基本振荡相关的相位位置信号用于计算一个致动信号(SM1-SM4)。 因此,可以确定纸幅(P1-P4)的切割位置,而不会在其上产生所谓的对准标记或记录保持标记。