Patent ID: 8875747

Claim:
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 actuatable by contact-free transmission of signals or forces.