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    • 1. 发明授权
    • Wire-dot impact printer
    • 点击冲击打印机
    • US5295750A
    • 1994-03-22
    • US15094
    • 1993-02-09
    • Jiro TanumaNaoji AkutsuTakao UchidaChihiro KomoriMasaru Ito
    • Jiro TanumaNaoji AkutsuTakao UchidaChihiro KomoriMasaru Ito
    • B41J2/30B41J2/235B41J9/44
    • B41J9/44
    • In a wire-dot impact printer having a capacitance detector for detecting a displacement of each armature by a sensor electrode arranged opposite the armature, a space is formed between each sensor electrode and its associated armature, and a shield pattern is formed with a small space left around each sensor electrode. The shield pattern is fed with a potential at least equal to the potential of each sensor electrode. This makes it possible to reduce the influence of noise upon detection of a capacitance by the capacitance detector. A noise canceling electrode is also disposed around each sensor electrode and is connected to the sensor electrode, whereby a noise canceling circuit is further provided to eliminate noise voltage. The noise canceling circuit can eliminate a noise voltage picked up by the sensor electrode and the noise canceling electrode.
    • 在具有电容检测器的线点冲击式打印机中,通过与衔铁相对设置的传感器电极检测每个电枢的位移,在每个传感器电极及其相关电枢之间形成空间,并且形成具有小空间的屏蔽图案 留在每个传感器电极周围。 屏蔽图案被馈送至少等于每个传感器电极的电位的电位。 这使得可以通过电容检测器来减小噪声对电容检测的影响。 噪声消除电极也设置在每个传感器电极周围并连接到传感器电极,由此进一步提供噪声消除电路以消除噪声电压。 噪声消除电路可以消除由传感器电极和噪声消除电极拾取的噪声电压。
    • 8. 发明授权
    • Temperature control in a wire dot printer
    • 电线打印机温度控制
    • US5064302A
    • 1991-11-12
    • US514838
    • 1990-04-26
    • Jiro TanumaHideaki IshimizuTadashi KasaiChihiro Komori
    • Jiro TanumaHideaki IshimizuTadashi KasaiChihiro Komori
    • B41J2/30
    • B41J2/30
    • A wire dot printer has a thermistor that detects the temperature of a print head and a counter that starts counting when the detection temperature exceeds an alarm temperature. The printer can be controlled by switching over between normal-printing and reduced-character-printing in which a reduced number of print wires is used. When the detection temperature exceeds the alarm temperature, the printer will first stop and then control the print head in such a way as to reduce the temperature. Once the temperature drops back down below the alarm temperature, the printer will perform reduced-character-printing for a definite period of time based on the length of time from when the temperature exceeded the alarm temperature to when the temperature dropped back down below the alarm temperature. By increasing the length of time in which reduced-character-printing is carried out, the amount of heat given off by the print head decreases. Furthermore, by basing the time over which reduced-character-printing is performed on the length of time that the alarm temperature was exceeded. It is possible to set the reduced-character-printing time to an appropriate length such that the print head does not overheat and throughout is not excessively impaired.