| 摘要 |
In a press, of the type including at least two mold parts arranged to be closed, to define a mold cavity, and opened relative to each other, relatively movable carrier plates each mounting a mold part, a toggle mechanism operable by a driving motor to displace one carrier plate relative to a stationary carrier plate, a joint plate engaged with the toggle mechanism, beams extending between the stationary carrier plate and the joint plate, and laterally of the one carrier plate, the beams constituting tension members interconnecting the stationary carrier plate and the joint plate, and a shifting mechanism for adjusting the effective length of the beams between the stationary carrier plate and the joint plate, a method of operating the press comprises predetermining the range of values of the power required by the driving motor to close the mold parts and, responsive to the power required by the driving motor, during a preselected range of the closing movement of the mold parts, deviating from the predetermined value range, operating the shifting mechanism to adjust the effective length of the beams in a direction to restore the required power to the predetermined value range. A dynamometer is included in the apparatus to measure the required power, and may be in the form of a pressure responsive switch means. The shifting mechanism includes adjusting means interposed between a common driving means and plural nuts threaded on the beam and driven by the common driving means.
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