公开(公告)号：US5042375A

公开(公告)日：1991-08-27

申请号：US515103

申请日：1990-04-27

申请人： Manfred Gruner ,  Christian Vogelmann

发明人： Manfred Gruner ,  Christian Vogelmann

IPC分类号： B41J29/377 ,  B41J2/30

CPC分类号： B41J2/30

摘要： A switching signal, either for the switching off of the print head (20), or for a lowering of the operating frequency, or for a switching-on/switching-off control of a blower motor, is employed in connection with an installation of a temperature surveillance of a print head (20) or of a hammer block based on an electromagnetic coil construction. In order to achieve a more precise, a quicker and a more individual measurement determination, the electromagnetic coil (3), coordinated to each print element (1), is in each case switched during a current-passing pause to a primary constant current source generating a voltage (U.sub.p). A coil voltage drop (U.sub.s) at the electromagnetic coil (3) generates a reference signal (26) at the comparator (27) setting the temperature limit. The reference voltage (U.sub.ref) is received as a binary logic signal in an intermediate data memory storage (30). The logic signal serves as a control signal for effecting a temperature limiting or a temperature lowering in the print head (20).

摘要翻译： 为了关闭打印头（20）或者降低操作频率，或用于鼓风机电动机的接通/关断控制，切换信号被用于安装 基于电磁线圈结构的打印头（20）或锤块的温度监视。 为了实现更精确，更快速和更独立的测量确定，与每个打印元件（1）协调的电磁线圈（3）在每个情况下在电流通过暂停期间切换到主恒定电流源 产生电压（Up）。 在电磁线圈（3）处的线圈电压降（Us）在比较器（27）处产生设定温度限制的参考信号（26）。 参考电压（Uref）作为中间数据存储器（30）中的二进制逻辑信号被接收。 该逻辑信号用作用于实现打印头（20）中的温度限制或降低温度的控制信号。