-
公开(公告)号：US4854756A
公开(公告)日：1989-08-08
申请号：US80769
申请日：1987-08-03
摘要： In a printer in which an elongated shuttle is driven in reciprocating fashion across a print paper with hammers mounted along the length of the shuttle being selectively fired to print dots on the paper, a timing system provides hammer fire pulses denoting the positions of the shuttle at which hammer firing should be initiated to print in the proper dot positions. Proper timing is maintained so as to allow for printing during acceleration and deceleration as well as during constant velocity movement of the shuttle by determining the average shuttle velocity between each successive pair of fence post pulses generated by a shuttle-coupled encoder. The average velocities are represented by the time lapses between occurrence of the pairs of fence post pulses which are measured and stored during each startup of the printer as well as each time the nominal operating shuttle velocity is changed as part of a change in printer operation. Dot positions are represented by a percentage of the distance between a pair of fence post pulses, such that the time of occurrence of each dot position following the immediately prior fence post pulse can be determined by applying the percentage to the stored time lapse between the pair of pulses. The time position of each dot position as so determined is stepped back by the fixed hammer flight time to arrive at the hammer fire pulse times which are referenced to the immediately prior fence post pulse and which are used during each stroke of the shuttle.
摘要翻译： 在打印机中，细长梭子以往复方式穿过打印纸被驱动，沿着梭子的长度安装的锤被选择性地点燃以在纸上打印点，定时系统提供表示梭子的位置的锤击火脉冲 应该开始锤击射击以在适当的点位置打印。 保持适当的定时，以便允许在加速和减速期间以及通过确定穿梭耦合的编码器产生的每个连续的一对栅栏柱脉冲之间的平均梭速度在梭子的恒定速度移动期间进行打印。 平均速度由打印机每次启动期间测量和存储的栅栏柱脉冲对之间的时间间隔以及每当打印机操作的改变的一部分改变时，每时间间隔表示。 点位置由一对栅栏脉冲之间的距离的百分比表示，使得可以通过将百分比应用于对之间存储的时间间隔来确定紧接在之前的栅栏后脉冲之后的每个点位置的出现时间 的脉冲。 如此确定的每个点位置的时间位置通过固定的锤子飞行时间被退回，以获得参考先前的挡板后脉冲并且在穿梭的每个冲程期间使用的锤击火焰脉冲时间。
搜索结果
1 条记录 (耗时 0.012 秒)
