| 摘要 |
PURPOSE:To enable a board to be easily and accurately positioned at the same level with a clamp member corresponding to the change of the board in thickness attendant of the change of the board in type by a method wherein the stopper of a stopper device which specifies the protrusion limit of a rod is made freely controllable in position in a direction in which the rod protrudes or retracts, and the up-down stroke of a support table by the rotation of a rotor is made freely adjustable. CONSTITUTION:The up-down stroke of a support table 1 and a board 3 is specified by the rotation of rotors 21 and 21a or the protrusion-retraction stroke of a rod 14. Therefore, by making a stopper 32 advance or recede controlling a control section 33, the protrusion-retraction stroke is adjusted to control the up-down stroke of the board 3. When the board 3 becomes thick due to the change of the board 3 in type, the stopper 32 is made to advance to made the up-down stroke small, and when the board becomes thin, the stopper is made to recede to made the up-down stroke large, whereby the up-down stroke can be adjusted so as to made the upside of the board 3 level with the upside of the clamp member 4. |
