| 摘要 |
A thread clamp (3, 103, 203), which comprises a stationary clamping part (4, 104, 204) and a movable clamping part (5, 105, 205), is mounted on a gripper head (1, 101, 201) for the insertion of weft threads (2) on a gripper weaving machine. For opening or closing the thread clamp (3, 103, 203), it is connected with a hollow body (6, 106, 206) that is expandable by pressurized air. A second expandable hollow body (8, 108, 208) is pressed together in such a manner so that an internal pressure builds up therein, by means of a control arrangement mounted on the gripper weaving machine. Moreover, a valve (9, 109, 209) is present on the gripper head, which valve is embodied as an automatically closing non-return or check valve. The valve (9, 109, 209) is opened by an increase of the internal pressure in the second expandable hollow body (8, 108, 208) or by contact-free transmission of signals or forces of an actuator (13, 113, 213) mounted on the gripper weaving machine. Inlet and outlet of the valve are connected respectively with one of the two expandable hollow bodies (6, 8, 106, 108, 206, 208) in such a manner so that upon opening of the valve (9, 109, 209) a pressure compensation between the two hollow bodies (6, 8, 106, 108, 206, 208) takes place. Through this pressure compensation the thread clamp (3, 103, 203) is opened or closed, so that a weft thread (2) can be picked up or released by the gripper head (1, 101, 201).
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