US 2013/0199659 A1Published application

Gripper Head for the Insertion of Weft Threads on a Gripper Weaving Machine

AssigneeLindauer Dornier Gesellschaft mbH

InventorMarkus Gielen

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Abstract

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).

Gripper head (1, 101, 201) usable for the insertion of weft threads (2) on a gripper weaving machine with a thread clamp (3, 103, 203) mounted on the gripper head (1, 101, 201), which thread clamp comprises a stationary clamping part (4, 104, 204) and a movable clamping part (5, 105, 205), whereby the movable clamping part (5, 105, 205) is pressable against the stationary clamping part (4, 104, 204) by means of a force, furthermore with a first hollow body (6, 106, 206) mounted on the gripper head (1, 101, 201), the volume of which is enlargeable under internal pressure of a gaseous medium, whereby the first hollow body (6, 106, 206) is connected with the movable clamping part (5, 105, 205) in such a manner so that through the volume enlargement of the first hollow body (6, 106, 206) a clamping part force is producible, which acts on the movable clamping part (5, 105, 205), furthermore with a valve (9, 109, 209) mounted on the gripper head (1, 101, 201), which is connected with the first hollow body (6, 106, 206) in such a manner so that the gaseous medium is conveyable through the valve (9, 109, 209) into the first hollow body (6, 106, 206), characterized in that

a return means (7, 107, 207) is present on the gripper head (1, 101, 201), which is connected with the movable clamping part (5, 105, 205) in such a manner so that a return force acting through the return means (7, 107, 207) on the movable clamping part (5, 105, 205) opposes the clamping part force, and that
a second hollow body (8, 108, 208) is mounted on the gripper head (1, 101, 201), in which an internal pressure of a gaseous medium is producible in that an external control force is applied onto this second hollow body (8, 108, 208), which causes a reduction of the volume of the second hollow body (8, 108, 208), and that
the valve (9, 109, 209) is connected with the first and second hollow body (6, 8, 106, 108, 206, 208) in such a manner so that with opened valve (9, 109, 209) an exchange of the gaseous medium between the two hollow bodies (6, 8, 106, 108, 206, 208) takes place, while with closed valve (9, 109, 209) the gaseous medium cannot escape out of the first hollow body (6, 106, 206), and that
a closing means (10, 110) is mounted on the valve (9, 109, 209) in such a manner so that a closing force caused by the closing means (10, 110) opposes such forces by which the valve (9, 109, 209) is opened, and that
the valve (9, 109, 209) is embodied in such a manner so that it is actuateable by contact-free transmission of signals or forces.

2 more elements

Abstract

Claims15