Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Reexamination Certificate
2000-08-22
2001-08-14
Falik, Andy (Department: 3741)
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
Reexamination Certificate
active
06273150
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method and apparatus to monitor filling-yarn insertion in a weaving machine, the particular filling to be inserted being severed from a previously inserted filling already bound into a fabric.
RELATED ART
Illustratively as regards gripper weaving machines, a feed gripper picks up a filling which shall be inserted into a shed, the front part of the filling being still connected to the previously inserted and now woven filling while its portion to be inserted is kept in readiness by a yarn feeder or the like. The filling to be inserted must be severed by filling-scissors at the beginning of insertion. There is an attendant risk that the filling might not be properly picked up by the feed gripper or that it will be torn between the fabric and the feed gripper.
SUMMARY OF THE INVENTION
The objective of the invention is to create a method to substantially avoid the danger of improperly picking up the filling to be inserted and/or the tearing of the filling at the fabric.
This problem is solved by detecting the time at which the filling is severed.
In one embodiment of the invention this problem is solved by a device for detecting the time of severing the filling.
By detecting the time at which the filling is actually severed, it is possible to adjust the operation of the filling-scissors and/or to so match other elements with the filling insertion that untimely cutting of the filling is avoided. Premature filling-severing in most instances entails improper pickup of the filling by the feed gripper. Delayed severing in most cases results in tearing of the filling between the fabric and the feed gripper.
The invention is based on the recognition that the instant at which a filling is actually severed does not coincide with the instant at which the scissor blades of a filling-scissors assume a given position. Instead, a filling is actually severed as a function of its thickness or its position relative to said scissor blades or of the motion of said blades at their different positions.
In a preferred embodiment of the invention, the filling tension is detected for the purpose of determining the time of severing of the filling. This procedure takes advantage of the fact that upon filling severing, the tension of the filling drops abruptly and consequently the time of cutting can be determined very accurately in this manner.
REFERENCES:
patent: 4834145 (1989-05-01), Lewyllie
patent: 4917153 (1990-04-01), Mori et al.
patent: 5105856 (1992-04-01), Wahhoud
Salomez Herman
Shaw Henry
Bacon & Thomas, PLL
Falik Andy
Picanol N.V.
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