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    • 2. 发明授权
    • Scale balancing device in universal parallel ruler device
    • 通用并联尺尺寸平衡装置
    • US4601107A
    • 1986-07-22
    • US689898
    • 1985-01-09
    • Yasutomo Yoshida
    • Yasutomo Yoshida
    • B43L13/08B43L13/02
    • B43L13/08
    • A scale balancing device for use in a universal parallel ruler device having a head, a spindle rotatably supported on a non-rotating part of the head, a scale mounting plate fixed to the lower spindle, a handle fixed to the upper spindle, and scales mounted on the scale mounting plate, the device has a first gear coaxially mounted on the spindle for rotation therewith, the weight of the scales exerting a torque on the first gear, a second gear rotatably mounted on a non-rotating part of the head and having a spring connected thereto for applying a torque to the second gear to rotate the second gear in a predetermined rotating direction, and a two-stage intermediate gear having a small gear and a large gear integrally connected and rotatably supported on a non-rotating part of the head, the second gear being in mesh with the small gear and the large gear being in mesh with the first gear, the ratio of the diameter of the first gear to the diameter of the large gear being substantially the same as the ratio of the diameter of the second gear to the diameter of the small gear, and the direction in which the torque is exerted on the first gear due to the weight of the scales being transmitted through the two-stage gear and exerted on the second gear in a direction opposite the predetermined direction and being substantially cancelled out by the torque on the second gear due to the spring.
    • 一种用于具有头部,可旋转地支撑在头部非旋转部分上的主轴的平行尺尺寸通用装置中的平衡装置,固定在下主轴上的标尺安装板,固定在上主轴上的把手和秤 安装在秤安装板上,该装置具有同轴安装在心轴上以与其一起旋转的第一齿轮,该秤在第一齿轮上施加扭矩的重量,可旋转地安装在头部的非旋转部分上的第二齿轮, 具有连接到其上的弹簧用于向第二齿轮施加扭矩以使第二齿轮沿预定的旋转方向旋转,以及具有小齿轮和大齿轮的两级中间齿轮,其一体地连接并可旋转地支撑在非旋转部分上 头部的第二齿轮与小齿轮啮合,大齿轮与第一齿轮啮合,第一齿轮的直径与大齿轮的直径之比基本上为t 它与第二齿轮的直径与小齿轮的直径的比率以及由于秤的传递通过两级齿轮的重量而施加在第一档上的方向相同,并施加 在第二齿轮上沿着与预定方向相反的方向,并且由于弹簧而被第二齿轮上的扭矩基本抵消。