| 摘要 |
<p>A squeege structure for a screen stencil of a printing machine comprises an elongated carrier frame and a squeegee coupled to the carrier frame by a thrust drive for moving the squeegee between operative and nonoperative positions. The thrust drive includes a central first thrust drive unit and a plurality of second thrust drive units mounted on each side of the first thrust drive unit. The movable portion of the first thrust drive unit may only move along its thrust axis which is in a direction perpendicular to the longitudinal axis of the carrier frame and is restrained from moving in a direction perpendicular to the thrust axis. The movable members of the second thrust drive units may move along their thrust axes and may also move in a direction perpendicular to the thrust axis and parallel to the longitudinal axis of the carrier frame, but may not move in a direction perpendicular to both the thrust axis and the carrier frame longitudinal axis. This structure permits the first and second thrust drive units to be flexibly coupled to compensate for deflection of the carrier member to avoid seizing of the first and second thrust drive units and provide uniform pressure along the entire length of the squeegee.</p> |
