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    • 2. 发明公开
    • Mechanism for positioning tractors
    • Mechanismus zur Positionierung von Stiftantrieben。
    • EP0501130A2
    • 1992-09-02
    • EP92100840.5
    • 1992-01-20
    • INTERNATIONAL BUSINESS MACHINES CORPORATION
    • Gregory, Floyd ArthurHolton, James ThomasMaliwacki, JohnStone, Lawrence Allen
    • G03G15/00B41J11/32
    • B41J11/32Y10T74/2084Y10T74/20846
    • Apparatus for use with a printer which has a pair of tractors that engage sprocket holes in the paper to adjust for different paper widths or to adjust the lateral position of the paper. The apparatus comprises a pair of coaxial lead screws (25, 26) one (25) attached to a rotatable shaft (29) and the second (26) rotatable on the shaft (29) adjacent to and relative to the one lead screw (25). One tractor is coupled to each lead screw (25, 26). Rotation of the one lead screw (26) is obtained by a knob (30) keyed to an end of the rotatable shaft (29). Rotation of the second lead screw (26) is prevented during rotation of the knob (30) by spring loaded fingers (31a) with detent elements engageable with detention gearing (26c) on the end of the second lead screw (26). Rotation of both screws (25, 26) is obtained by rotation and axial movement of the knob (30) on the shaft so that a cam surface on the knob engages cam means of the spring fingers (31a) to disengage detent elements from the detention gearing and drive gearing on the knob (30) engages drive gearing on the second lead screw (26).
    • 用于与打印机一起使用的装置,该打印机具有一对牵引器,该拖拉机与纸张中的链轮孔啮合,以适应不同的纸张宽度或调整纸张的横向位置。 该装置包括一对同轴的导螺杆(25,26),一个连接到可旋转轴(29)上的一个(25)和第二个(26)可绕轴(29)旋转,邻近一个导螺杆 )。 一个拖拉机联接到每个导螺杆(25,26)。 一个导螺杆(26)的转动是通过一个与可旋转轴(29)的一端相连的旋钮(30)获得的。 通过弹簧加载的手指(31a)在旋钮(30)旋转期间防止第二导螺杆(26)的旋转,其中制动元件可与第二导螺杆(26)的端部上的卡止齿轮(26c)啮合。 两个螺钉(25,26)的旋转通过旋钮(30)在轴上的旋转和轴向移动来获得,使得旋钮上的凸轮表面接合弹簧指(31a)的凸轮装置以使制动元件脱离锁定 旋钮(30)上的传动和驱动齿轮传动装置接合在第二导螺杆(26)上的驱动齿轮传动。