| 摘要 |
<p>A device for cutting lengths of tubing from a longer tube utilizes an external pair of cutting dies and an internal pair of punches. An eccentric relative motion ("shimmy") of the cutting dies results in the desired cutting of the tube. The punches are inserted into the tube from the end of the tube from which the length of tubing is to be cut. A restraining arrangement prevents the punches from moving farther along the tube than is desired, while a punch positioning mechanism prevents movement of the punches toward the open end of the tube. Thus, the internal punches are accurately positioned with respect to the external cutting dies. A centering arrangement is utilized to insure coaxiality of the punches. After the cutting dies have been actuated to cut the tube, the tube is advanced an amount corresponding to the length of tubing to be cut, after which the punch positioning mechanism is reciprocally withdrawn to permit the cut length of tubing to be discharged and then reinserted to position the punches for the next cutting operation. During the cutting operation the punches are held in the desired position between the punch positioning mechanism and the restraining arrangement. Various types of restraining means may be utilized to hold the punches, and the resistance of the restraining means to further movement along the tube may be adjusted to any desired level.</p> |
