| 摘要 |
The disclosure of this invention relates to a shear for side trimming or dividing steel plates produced by a rolling mill. It illustrates and describes a stationary lower knife head to which there is secured a lower knife and a vertically movable upper knife head that supports the upper knife. The upper knife head is connected to a crank shaft by pitmans and through which means the upper knife is moved towards and away from the lower knife to effect a cut. The path of the shearing and return stroke of the upper knife head is controlled so that during the cutting portion of the shearing stroke, the upper knife is caused to move perpendicular to the plate over the entire range of plate thicknesses adapted to be sheared and immediately thereafter the upper knife is displaced away from the sheared edge of the plate. This control is achieved by providing a guide for the upper knife head in which the guide is held perpendicular to the plate during the shearing stroke and displaced laterally immediately after shearing and during the first portion of its return stroke in a manner that the lower portion of the head is tilted away from the sheared edge of the plate. A cam mounted on the crank shaft engaged by a cam roller connected to the guide is employed to control the positioning of the guide in timed sequence to the rotation of the crank shaft.
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