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    • 6. 发明授权
    • Ribbon tension control with dynamic braking and variable current sink
    • 带张力控制与动态制动和可变电流吸收
    • US5490638A
    • 1996-02-13
    • US843875
    • 1992-02-27
    • James F. DriftmyerRobert F. JessenGeorge Melnyk
    • James F. DriftmyerRobert F. JessenGeorge Melnyk
    • B41J33/34B41J33/52B65H23/18B65H77/00
    • B41J33/52B41J33/34B65H23/1806B65H2513/10B65H2515/322B65H2557/20
    • A pair of ribbon spools are independently operated by respective motors to rotate in one direction until the ribbon end and then in the opposite direction, and so forth. Spools alternately function as feed and take-up spools and motors as a drive and drag motors, respectively To eliminate excess drag motor cogging, a ribbon tension control system uses dynamic braking of the drag motor, and includes drag circuitry with rectifier bridge circuitry and a constant current sink settable for drawing predefined selectable levels of current from the windings of the drag motor. The motors are polyphase, permanent magnet, stepper motors which, when turned by the ribbon, generate alternating back emf signals in their windings. A full-wave rectifier bridge is connected to each winding of the drag motor with bridge outputs connected to a common sink which is an emitter follower circuit whose current level is set and maintained by an operational amplifier. The current level of the emitter follower circuit is set by adjusting the reference voltage of the amplifier using a resistive voltage divider network connected to a binary switch controlled by a microprocessor with a memory. The microprocessor monitors the back emf signals, periodically adjusts the rotational speed of the drive motor depending on distribution of ribbon, and adjusts the sink based on drag value tables stored in memory.
    • 一对带状卷轴由相应的马达独立地操作,以在一个方向上旋转直到带状端部然后沿相反的方向转动,等等。 轮轴交替作为进给和卷取线轴和马达分别用作驱动和拖动马达。为了消除多余的拖拉马达齿槽,色带张力控制系统使用拖拉电机的动态制动,并且包括具有整流桥电路和 恒定电流可设置用于从拖曳电机的绕组中抽出预定的可选电流。 电动机是多相,永磁体,步进电机,当由带状物转动时,它们在其绕组中产生交替的反电动势信号。 全波整流桥连接到拖曳电机的每个绕组,其桥接输出连接到公共接收端,公共接收端是电流电平由运算放大器设置和维持的射极跟随器电路。 通过使用连接到由具有存储器的微处理器控制的二进制开关的电阻分压器网络来调节放大器的参考电压来设置射极跟随器电路的电流电平。 微处理器监视反电动势信号,根据色带的分布周期性地调节驱动电动机的转速,并根据存储在存储器中的拖动值表调整接收器。