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    • 2. 发明授权
    • Method and apparatus for controlling tension in tape progressed along a
feed path
    • 用于控制带中的张力的方法和装置沿着进给路径进行
    • US4788558A
    • 1988-11-29
    • US12209
    • 1987-02-06
    • Edward D. CaldwellDavid A. Ballard
    • Edward D. CaldwellDavid A. Ballard
    • B41J15/04B41J33/14B41J33/34B65H23/00B65H23/18G01D15/00
    • B41J33/34B65H23/005B65H23/1806
    • A method and apparatus for controlling the tension in a tape (16, 18) along a feed path between a reel (84, 112) and a processing station (20) is disclosed. A motor (146, 162) having a controllable torque is coupled to the reel. An advancement mechanism (22, 142) advances the tape through the processing station. Sensors (190, 192) produce signals proportional to the advancement of the tape through the processing station as well as the advance of the reel. These signals are compared to produce an indicia of the present operating radius of the tape on the reel, which is dependent upon the amount of tape wound upon the reel. With this indicia determined, empirically derived data can be consulted to determined the energization of the motor necessary to produce a torque that will compensate for the changing tape diameter on the reel, maintaining the tension in the tape substantially constant independent of the transfer of tape with respect to the reel. In a preferred embodiment, this arrangement is employed to control the tension in thermal transfer ribbon (16) and receiving paper (18) between a print roller (22) and their respective reels (146, 162) in a thermal transfer printer (10).
    • 公开了一种用于控制沿着卷轴(84,112)和处理站(20)之间的进给路径的带(16,18)中的张力的方法和装置。 具有可控扭矩的电动机(146,162)联接到卷轴。 前进机构(22,142)使带子前进通过处理站。 传感器(190,192)产生与通过处理站的带的前进成比例的信号以及卷轴的前进。 将这些信号进行比较以产生卷轴上的带的当前操作半径的标记,这取决于卷绕在卷轴上的带的量。 在确定了该标记的情况下,可以查阅经验导出的数据,以确定产生扭矩的马达的通电,该扭矩将补偿卷轴上的更换带直径,从而保持带中的张力基本上恒定,而与带的传送无关, 相对于卷轴。 在优选实施例中,这种布置用于控制热转印打印机(10)中的热转印带(16)和接收纸(18)之间的张力在打印辊(22)和它们各自的卷轴(146,162)之间, 。