| 摘要 |
In a screen printing apparatus for printing a conical object rotatable about a rotation axis (4) by means of a screen member (2) which must perform a circular motion about the cone intersection point (6) of the conical object, this circular motion is reproduced by means of three linear drive devices (14,22) and 24). A first linear drive device (14) produces a translational motion of a U-shaped frame (10), in which the screen member holder (8) is held, in a direction transverse to the rotation axis (4) of the object to be printed. The additional drive devices (22,24) act to superimpose both a translational motion transverse to that of the first linear drive device (14) and a rotary motion of the screen member (2) about its center point (38). The first linear drive (14) and the additional linear drive devices (22,24) are numerically controllable by a computer, in which a predetermined motion course for the screen member is stored. This structure avoids the necessity of providing a means for rotation axle at the pivot point (6) and thus reduces the structural expense and space required for the apparatus. At the same time the apparatus can be used for printing cylindrical objects using exclusively the first linear drive device.
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