| 摘要 |
A printing press has a support arm (12) that can move between lower and upper positions, first and second link plates (30,31) swingably supported by a main frame (1) and the support arm (12), respectively. A connection pin (32) having a protruding end portion is provided to connect the link plates (30,31). A support lever (33), swingably supported by the main frame (1), has an engagement groove (33a) which disengageably engages with the protruding end portion of the connection pin (32). When the support arm (12) moves from the lower position to the upper position, the protruding end portion of the connection pin (32) comes into contact with the edge surface of a lower portion of the support lever (33), and swings the support lever (33). When the protruding end portion of the connection pin (32) reaches the engagement groove (33a) of the support lever (33), the protruding end portion engages with the engagement groove (33a), so that the support arm (12) is held at the upper position. <IMAGE> |
