公开(公告)号：US4854756A

公开(公告)日：1989-08-08

申请号：US80769

申请日：1987-08-03

申请人： Kenneth A. McCrimmon, Jr. ,  Matthew M. Chu

发明人： Kenneth A. McCrimmon, Jr. ,  Matthew M. Chu

IPC分类号： B41J2/515 ,  B41J9/46 ,  B41J9/50 ,  B41J19/18

CPC分类号： B41J9/46 ,  B41J9/50

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。

公开(公告)号：US4685818A

公开(公告)日：1987-08-11

申请号：US776614

申请日：1985-09-16

申请人： Sam Kazarian ,  Steffen D. Hagene ,  Kenneth A. McCrimmon, Jr. ,  Robert C. Miller ,  James A. Schwerin

发明人： Sam Kazarian ,  Steffen D. Hagene ,  Kenneth A. McCrimmon, Jr. ,  Robert C. Miller ,  James A. Schwerin

IPC分类号： B41J35/36

CPC分类号： B41J35/36

摘要： A ribbon fault detection system within an impact printer has a pair of resilient electrical contacts disposed in spaced-apart relation across the width of an ink ribbon within each of a pair of ribbon guides located between the opposite ends of a print station and a pair of spools for receiving the opposite ends of the ink ribbon and driving the ink ribbon. Each of the electrical contacts which is silicone coated to minimize ink migration and which is normally held out of engagement with a mating contact due to engagement by the ribbon is coupled in parallel with the other resilient electrical contacts so that closure of any one of the resilient electrical contacts onto its mating contact will generate an indication of a ribbon fault condition. A ribbon fault condition which may be caused by a folded ribbon or other undesired condition and which closes one or more of the contacts turns on a transistor via an operational amplifier having a capacitor coupled thereacross to provide a desired delay in turning on the transistor and which is coupled through a Zener diode to further control the conduction and nonconduction of the fault indicating transistor.

摘要翻译： 冲击式打印机内的带状故障检测系统具有一对弹性电触头，其间隔开的一系列位于打印台的相对端之间的一对带状引导件中的色带的宽度处的间隔开的关系， 用于接收墨带的相对端并驱动墨带的线轴。 被硅化物涂覆以最小化墨水迁移并且通常由于与色带的接合而与配合触点保持不接合的每个电触头与其它弹性电触头并联耦合，从而使弹性 电触点到其配合触点将产生丝带故障状态的指示。 可能由折叠的带状物或其他不期望的状况引起的并且闭合一个或多个触点的带状故障状况通过运算放大器导通晶体管，所述运算放大器具有耦合到其上的电容器，以提供导通晶体管所需的延迟，以及哪个 通过齐纳二极管耦合以进一步控制故障指示晶体管的导通和非导通。