Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Reexamination Certificate
2000-01-03
2001-05-15
Falik, Andy (Department: 3741)
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
Reexamination Certificate
active
06230759
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a gripper weaving machine comprising at least one gripper mounted by a guide portion to a rapier, further comprising guide units arranged in a row and insertable into an open shed and fitted with guides guiding the rapier and the guide portion.
2. Background of the Invention
A gripper weaving machine of the above type is known for example from the European patent document A1 0,576,854. The guide units are fitted with guide elements which are associated with the top and bottom sides of the rapier and to the upper sides and undersides of the guide portion that are flush with said top and bottom sides. At least one guide rib is provided at the guide portion and is associated with a transverse guide of the guide units. Accordingly transverse guidance takes place only in the region of the guide portion, the rapier per se being of uniform and substantially rectangular cross-section. Accordingly the rapier is designed to be comparatively flexible in the direction of is its flat sides while being relatively stiff transversely. This design is possible because the transverse guidance is provided by the guide portion.
Desirably the speed of operation is increased in gripper weaving machines of the this type, in particular the filling frequency. This filling frequency can be raised when the shed that just received the filling is already closing before the gripper(s) has (have) been fully withdrawn from it.
SUMMARY OF THE INVENTION
The objective of the invention is to design a gripper weaving machine so that shed closure before full gripper withdrawal will be as free as possible of malfunction.
This problem is solved in that the guide portion at its side facing away from the gripper is fitted with at least one slide rib running in the longitudinal direction of the guide portion that protects the warps against contact with the guide portion.
When closing the shed before the gripper has been fully withdrawn from it, the minimum of one slide rib prevents warps from coming into contact with the guide portion, thereby assuring in the first place that the warps will not damage the typically plastic guide portion, in particular its guidance surfaces and, on the other hand, avoiding damaging or tangling the warps by the wear-susceptible guidance surfaces of the guide portion.
To carry out the invention, at least one slide rib is provided at the guide portion and/or the gripper, as an extension of this gripper and extending in the direction of the rapier. The rib protects the warps against making contact with the guide portion. Typically the gripper is made of a metal having a comparatively low coefficient of friction relative to the warps. The gripper projects beyond the guide portion so that warps resting against it will not touch the guide portion. This effect is maintained over the entire length of the guide portion when the slide rib is present, and accordingly the danger of damaging the guide portion and/or the warps is substantially reduced in this region.
REFERENCES:
patent: 2125894 (1938-09-01), Dewas
patent: 2151085 (1939-03-01), Dewas
patent: 3299911 (1967-01-01), Dewas
patent: 4834146 (1989-05-01), Pezzoli
patent: 5092374 (1992-03-01), Riolet et al.
patent: 5813440 (1998-09-01), Bortoli et al.
Carpentier Joost
Coopman Lucien
Shaw Henry
Bacon & Thomas PLLC
Falik Andy
Picanol N.V.
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