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    Variable printer intensity control
    91.
    发明授权
    Variable printer intensity control 失效
    可变打印机强度控制

    公开(公告)号：US3712212A

    公开(公告)日：1973-01-23

    申请号：US3712212D

    申请日：1971-11-12

    申请人： BURROUGHS CORP

    发明人： BEERY J

    IPC分类号： B41J9/48 ,  B41J9/00 ,  B41J7/94

    CPC分类号： B41J9/48

    摘要： Apparatus for printing characters with an impact intensity varying according to the surface area of the character being printed. Included in the apparatus is a cyclically movable character bearing member, such as a rotary print wheel or drum or an endless belt and one or more print hammers cooperable with the member forming a printing couple for printing characters. An electromagnetic field produced by a solenoid initiates the flight of the hammer against a document which may be moved relatively thereto as the printing operation is performed. The current through the solenoid coil is limited by resisters of different values which are controlled by electrical gates for selectively varying the amount of current supplied to the coil for driving the hammer. The timing of the printing is kept in synchronization with the document movement by means of an electromechanical clock capable of dividing each character position into an equal number of zones. During the operation of the printing apparatus, the sequence of accessing the digits to be printed, positioning the print wheel, and firing the hammer continues as the document moves through the apparatus. Associated with the print wheel and jointly rotatable therewith is a disk having a plurality of coded positions represented by apertures therein each position representing a printing character position on the print wheel.

    摘要翻译： 用于打印具有根据正在打印的字符的表面积而改变的冲击强度的字符的装置。 包括在装置中的是可循环移动的字符支承构件，例如旋转打印轮或滚筒或环形带以及一个或多个打印锤，该打印锤可与形成打印字符的打印对配合的构件配合。 由螺线管产生的电磁场启动锤子相对于在执行打印操作时相对于其移动的文件的飞行。 通过电磁线圈的电流受到电门控制的不同值的电阻的限制，用于选择性地改变提供给用于驱动锤的线圈的电流量。 通过能够将每个字符位置分成相等数量的区域的机电时钟，打印的时间保持与文档移动同步。 在打印设备的操作期间，当文档移动通过设备时，继续访问要打印的数字，定位打印轮和敲击锤的顺序。 与打印轮相关联并与之共同旋转的是具有由其中的孔表示的多个编码位置的盘，其中每个位置表示打印轮上的打印字符位置。