Textiles: weaving – Warp manipulation – Traversing
Reexamination Certificate
1999-11-22
2001-02-20
Falik, Andy (Department: 3741)
Textiles: weaving
Warp manipulation
Traversing
C310S012060
Reexamination Certificate
active
06189576
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for the controlled moving of a warp thread. It also refers to a weaving machine with an apparatus of this kind and to uses of the apparatus.
Leno apparatuses are used for the formation of selvedges: An eyed needle, which guides a warp thread in an eye, and a follower needle form a leno weave in interaction with a weft thread (see e.g. EP-A 0 737 764). The needles are moved by drive units which, in known weaving machines, comprise cable runs, control cams, rollers and levers. These mechanical components are expensive and prone to wear. When operating parameters (among others, heald stroke, shed geometry) are changed, time-consuming adjustments must be made by hand.
It is also known to use linear motors as drive units. An electronic processor, which is already used for the control of the weaving machine, can also be used for the control of the linear motors. In this it is however disadvantageous that control loops with special position sensors are required for the setting of warp thread layers using means which act point-wise—for example eyed needles (cf. WO 96/38608)
SUMMARY OF THE INVENTION
The object of the invention is to provide a further apparatus by means of which warp threads—in particular for the formation of cloth edges—are controlledly movable by means of a punctuate compulsory guidance (i.e. with means acting point-wise) and in which the named disadvantages are absent.
This apparatus, controlled by means of a punctuate compulsory guidance, moves a warp thread between three positions, namely a middle position, an upper position and a lower position. It comprises a pendulum which is pivotal about an axis and into which an electrical coil is integrated as well as stationary permanent magnets. The named positions are given by equilibrium positions of the pendulum, with forces which act on the pendulum in these positions in each case being in equilibrium. The equilibrium positions for the upper and the lower positions respectively can be produced by means of forces between the permanent magnets and the current carrying coil; the equilibrium position for the middle position is given by the pendulum with a current-less coil.
REFERENCES:
patent: 4998420 (1991-03-01), Scavino
patent: 5827975 (1998-10-01), De Jager et al.
patent: 6006795 (1998-10-01), Corain et al.
patent: 2119053 (1972-12-01), None
patent: 2133837 (1973-01-01), None
patent: 0393467A1 (1990-10-01), None
patent: 0467059A1 (1992-01-01), None
patent: 0737764A1 (1996-10-01), None
patent: 0750061A1 (1996-12-01), None
patent: WO 81/02312 (1981-08-01), None
patent: WO 96/38608 (1996-12-01), None
Falik Andy
Sulzer Rueti AG
Townsend and Townsend / and Crew LLP
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