Supplying and guiding weft thread on weaving machines
AssigneePicanol N.V.
InventorsHenry Shaw, Dirk Lewyllie, Jose Vangheluwe
Life of this patent
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Abstract
In a weaving machine, one of the guiding elements used to normally guide a weft thread between a thread preparation mechanism and the shed of the weaving machine is made moveable. The moveable guiding element may, for example, be an auxiliary weft insertion nozzle and can be used in place of supplemental threading and guiding mechanisms for such as purposes as retrieving a broken weft thread for automatic rethreading or extracting a defective weft thread from the shed.
Claims22
A device for automatically supplying and guiding weft thread from a thread preparation mechanism to near a point from which a weft thread is inserted into a shed of a weaving machine, comprising means including a movable guide element for guiding a weft thread along a path from the thread preparation mechanism to near the point from which the weft thread is inserted into the shed during the normal weaving process and for supplying a new weft thread for insertion into the shed when said guide element is moved between at least a first position adjacent said thread preparation mechanism and a second position near to the point at an entrance to the shed from which the weft threads are inserted into the shed;
- means for moving said guide element between said first position and said second position;
- and control means for controlling said moving means.
A device as claimed in 10, wherein the thread preparation mechanism includes a prewinding device having a fixed prewinder drum and a rotating winding tube, and wherein the thread preparation mechanism includes means connected to at least a motor of the winding tube and to said drive means of the movable guide element for stopping the winding tube and presenting the guide element at the exit of the winding tube whenever a weft thread has to be supplied from the thread preparation mechanism to the entrance of the shed.
A method for automatically supplying and guiding a weft thread to a shed on a weaving machine between a thread preparation mechanism and an entrance to the shed, comprising the steps of (a) during the normal weaving process, guiding the weft thread by means of a guide element, (b) when a thread break occurs between the thread preparation mechanism and the shed, moving said guide element such that it is presented at an exit of the weft thread preparation mechanism, and (c) taking up a thread end which is located at said exit into the guide element through an entrance of the guide element and then moving the guide element such that the weft thread taken up therein is brought up to the shed.
Dependencies are inferred from the claim text.