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1. 发明授权

US5490638A Ribbon tension control with dynamic braking and variable current sink 失效
标题翻译：带张力控制与动态制动和可变电流吸收
公开(公告)号：US5490638A
公开(公告)日：1996-02-13
申请号：US843875
申请日：1992-02-27
申请人： James F. Driftmyer , Robert F. Jessen , George Melnyk
发明人： James F. Driftmyer , Robert F. Jessen , George Melnyk
IPC分类号： B41J33/34 , B41J33/52 , B65H23/18 , B65H77/00
CPC分类号： B41J33/52 , B41J33/34 , B65H23/1806 , B65H2513/10 , B65H2515/322 , B65H2557/20
摘要： 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.
摘要翻译：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。

2. 发明授权

US4560929A Position detector apparatus and method utilizing damped oscillations 失效
标题翻译：利用阻尼振荡的位置检测装置和方法
公开(公告)号：US4560929A
公开(公告)日：1985-12-24
申请号：US485523
申请日：1983-04-15
申请人： George Melnyk
发明人： George Melnyk
IPC分类号： B41J1/20 , G01B7/00 , G01D5/244 , G01B7/14 , G01N27/00 , G08B19/00
CPC分类号： G01D5/244 , B41J1/20
摘要： Apparatus for sensing the position of an electrically conductive printing band in which the band moves at varying depths within the gap of an inductor in an inductor-capacitor resonance circuit that is periodically energized to induce eddy currents in the band. The oscillatory ringing resulting from pulsing the tank circuit decays at a rate that varies with the magnitude of the induced eddy current and, hence, the depth of the band in the gap. By counting the number of voltage excursions across the tank circuit resulting from an excitation that exceed a predetermined threshold during decay, the position of the band can be deduced. Corrective positioning may thereafter be undertaken.
摘要翻译：用于感测导电印刷带的位置的装置，其中带在电感器 - 电容器谐振电路中的电感器的间隙内在变化的深度处移动，该电感器 - 电容器谐振电路被周期性地激励以在该带中引起涡流。由脉冲电路产生的振荡振荡以随着感应涡流的大小和间隙中带的深度而变化的速率衰减。通过计算在衰减期间由超过预定阈值的激励导致的储能电路之间的电压偏移的数量，可以推导出频带的位置。之后可以进行纠正定位。

3. 发明授权

US5214558A Chopper drive control circuit 失效
标题翻译：斩波驱动控制电路
公开(公告)号：US5214558A
公开(公告)日：1993-05-25
申请号：US782857
申请日：1991-10-25
申请人： George Melnyk
发明人： George Melnyk
IPC分类号： B41J9/48 , H01H47/32
CPC分类号： H01H47/325 , B41J9/48
摘要： A coil is connected to a voltage source by a switch enabled by a drive signal of fixed duration. Drive current in a coil is terminated by a chopper circuit if it reaches a predetermined peak level before the end of preselected rise time interval. The chopper circuit is inhibited from operation until the end of the rise time interval during which time the drive current is allowed to decay. The chopper circuit is enabled at the end of the rise time interval for chopping the drive current at an average peak current value for the duration of the preselected time. The total amount of energy supplied to the actuator is adjusted by allowing the current to decay if the peak current is reached before the end of the predetermined rise time interval and then by chopping the current at a predetermined switching rate for the duration of the preselected time of the drive signal. Short circuit protection is also provided during the predetermined rise time interval.
摘要翻译：线圈通过由固定持续时间的驱动信号使能的开关连接到电压源。如果在预选上升时间间隔结束之前达到预定峰值电平，则线圈中的驱动电流被斩波电路终止。斩波电路被禁止运行，直到上升时间间隔结束，在此期间驱动电流被允许衰减。斩波电路在上升时间间隔结束时使能，以在预选时间的持续时间内以平均峰值电流值斩波驱动电流。如果在预定的上升时间间隔结束之前达到峰值电流，然后在预选时间的持续时间内以预定的切换速率切断电流，则通过允许电流衰减来调节提供给致动器的总能量的驱动信号。在预定的上升时间间隔期间也提供短路保护。

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