| 摘要 |
<p>The shears have a lower blade and an upper blade. The upper blade is reciprocated with respect to the lower blade through a transmission. The transmission includes a first eccentric which is continuously rotated to continuously reciprocate the upper blade over a vertical stroke equal to the throw of the first eccentric. This throw is transmitted to the upper blade through a second eccentric surrounding the first. The second eccentric is quickly rotatable, between two positions. In the first position, the upper blade is always clear of a billet on the lower blade. In the second position, the upper blade cuts the billet during the reciprocation. To ensure that the upper blade only penetrates approximately half the thickness of the billet, the position of the lower blade is vertically adjustable.</p> |
