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    • 26. 发明授权
    • Timing signal generating means for a high speed printer
    • 用于高速打印机的定时信号发生装置
    • US3865029A
    • 1975-02-11
    • US43426074
    • 1974-01-17
    • DATA PRODUCTS CORP
    • LYTLE DAN R
    • B41J7/36B41J9/10B41J9/44B41J9/46G01D5/244G01D5/245G06K15/08B41J7/08
    • B41J9/10B41J9/44
    • A timing signal generating system for use in a printer of the type in which a plurality of hammers are arranged along a print line and in which an endless belt, which supports charactercarrying slugs, moves along the print line at a speed of S inches per second, so that different characters become aligned with different hammers. The average character spacing is Pc and the average hammer spacing is Ph, where Pc/Ph X/Y, X and Y being integers, with X greater than Y. The system includes a sensor which senses the passage of each slug thereat to provide a pulse to a phase lock loop. The loop includes a voltage controlled oscillator which clocks an X-stage ring counter, with X output lines. The signals on the counter''s output lines represent the timing signals. The loop includes a phase detector which produces an output to a loop filter as a function of the phase relationship between the pulses produced in response to the sensed passing slugs and the signals (pulses) on one of the counter''s output lines. The filter''s output controls the output frequency of the oscillator. The filter, which acts as an integrator, has a time constant chosen so that the frequency of the oscillator is equal to X.S/Pc as long as the average spacing between characters passing said sensor during any interval, equal to the filter''s time constant, is equal to Pc.
    • 一种用于打印机的定时信号产生系统,其中多个锤子沿着打印线布置,其中支持字符携带的塞子的环形带以S英寸的速度沿打印线移动 每秒钟,使不同的角色与不同的锤子对齐。 平均字符间距为Pc,平均锤间距为Ph,其中Pc / Ph = X / Y,X和Y为整数,X大于Y.该系统包括一个传感器,该传感器检测每个塞子的通过,以提供 脉冲到锁相环。 该环路包括一个压控振荡器,用X级输出线对X级环形计数器进行计时。 计数器输出线上的信号表示定时信号。 该环路包括相位检测器,该相位检测器响应于感测到的通过段产生的脉冲与计数器的输出线之一上的信号(脉冲)之间的相位关系,产生环路滤波器的输出。 滤波器的输出控制振荡器的输出频率。 作为积分器的滤波器具有选择的时间常数,使得振荡器的频率等于X.S / Pc,只要在任何间隔期间通过所述传感器的字符之间的平均间距等于滤波器的时间常数 ,等于Pc。