Textiles: weaving – Special-type looms – Multiple-shed
Reexamination Certificate
2003-03-24
2004-11-16
Calvert, John J. (Department: 3765)
Textiles: weaving
Special-type looms
Multiple-shed
C139S037000, C139S102000, C139S116500
Reexamination Certificate
active
06817383
ABSTRACT:
This application claims the benefit of Belgian Application No. 2002/0210 filed Mar. 22, 2002.
SUMMARY OF THE INVENTION
This invention relates to a face-to-face weaving machine provided to form a shed between warp yarns during successive weft insertion cycles and each time to insert one or more weft yarns into this shed, so that two backing fabrics may be woven simultaneously above one another, this weaving machine comprising upper and lower spacers, which are provided in order to extend between the said backing fabrics in the warp direction during weaving and this weaving machine comprising a weft insertion device provided in order to insert weft yarns between the upper and lower spacers.
More particularly, the present invention relates to a face-to-face weaving machine, which has been designed for weaving simultaneously two fabrics with pile loops. More particularly, it deals with a face-to-face weaving machine equipped with a four-position jacquard machine.
The present invention likewise relates to a method for weaving fabrics with pile loops, in which each time at least three weft yarns are inserted above one another at a respective insertion level during successive weft insertion cycles on a face-to-face weaving machine, an upper and a lower backing fabric being woven from respective backing warp yarns and backing weft yarns, first and second loop weft yarns being inserted between the two backing fabrics and being kept at a distance from the two backing fabrics, first pile warp yarns being alternately interlaced in the upper backing fabric and forming a pile loop over at least one first loop weft yarn, second pile warp yarns alternately being interlaced in the lower backing fabric forming a pile loop over at least one second loop weft yarn and the first and second loop weft yarns being subsequently removed, so that two fabrics with pile loops are being woven at the same time.
More particularly, the present invention relates to a method for weaving carpets having one or more zones with pile loops at the face being used as well as one or more zones with a cut pile and/or one or more zones having a ribbed structure (false bouclé fabric) and/or one or more zones with a pile-free effect (where the backing weave is visible) and/or one or more zones with pile warp yarns floating on the pile face (flat weave), the zones with different effects together forming a pre-determined figure or pattern.
More particularly the present invention relates to a method carried out by means of a face-to-face weaving machine according to the present invention described in this patent application.
Of course, the present invention also relates to the fabrics and more particularly to the multicoloured carpets manufactured according to a similar method.
In the European patent application with publication number EP 0 974 690 a face-to-face weaving machine is described having the characteristics indicated in the first section of this description. This machine has upper and lower lancets in order to keep the loop weft yarns at a distance from the backing fabrics. During each weft insertion, a weft yarn is inserted between the two lancets.
With this type of machines, however, the weft insertion is carried out by a set of rapiers moving between the lancets. Then the vertical distance between the upper and the lower lancets should be sufficiently long to allow the rapiers to pass freely. The distance between the lancets and the respective backing fabrics determines the loop height. With these weaving machines, the loop height should be kept limited, so that sufficient space should be available for the rapiers to move. It is a purpose of this invention to remedy this drawback.
This purpose will be attained by providing a face-to-face weaving machine designed to form a shed between the warp yarns during the successive weft insertion cycles and each time to insert one or more weft yarns into this shed, so that two backing fabrics may be woven simultaneously one above the other, this weaving machine comprising upper and lower spacers, designed to extend between the said backing fabrics in the warp direction during weaving, this machine comprising a weft insertion device designed to insert weft yarns between the upper and lower spacers, and the weaving machine according to the present invention comprising spacers carried out in such a manner that they have a first part to form loops and a second part linking up with it, and shaped such that the vertical intermediate distance between the first parts of the upper and the lower spacers is shorter than the vertical intermediate distance between the second parts of the upper and lower spacers, and further also comprising a weft insertion device designed to insert weft yarns between the said second parts of this rigid elements.
Preferably, the longer vertical intermediate distance between the said second parts is obtained because the spacers are carried out with a bend. Then the first parts (preferably the end parts) are situated between the rulers of the weaving machine, while the said second parts are situated where the shed is formed and where the weft yarns are inserted.
In such an embodiment, sufficient space is available between the second parts of the spacers to allow a weft insertion means, such as for instance a rapier, to pass freely. The loop height is determined by the first parts of the spacers. Even when the vertical distance between these first parts is rather short, the vertical distance between the second parts may be sufficient to allow the weft insertion means to pass freely. Because of this, greater loop heights may be realized.
As clearly appears from the preceding pages, such a face-to-face weaving machine is particularly suitable for weaving fabrics with pile loops according to the present invention. Because of this, fabrics with pile loops can be produced at a high productivity and at a great weaving speed. Moreover, it is possible, within a same method and on the same weaving machine, to obtain fabrics with a large number of different effects, allowing fabrics to be produced, the pile face of which will show a wide variety.
Preferably, the spacers are designed to keep the weft yarns, inserted between them, at a distance from the respective backing fabrics, while the said first parts for forming loops comprise at least two parts of a different height, so that the said distance may be modified. By shifting the spacers (in the warp direction) another part of the spacers may be used and in doing so, the height of the pile loops may be modified.
In order to support the upper spacers the weaving machine may be equipped with a stationary weaving frame.
If the weft insertion device of this weaving machine is designed to insert at least three weft yarns at the different insertion levels during successive weft insertion cycles, during each cycle, a loop weft yarn and a backing weft yarn for each backing fabric are inserted. In this manner, fabrics with pile loops may be manufactured in a very productive manner.
In a particular embodiment, at least one upper and/or at least one lower spacer comprises a cutting device in order to cut through weft yarns inserted between the upper and lower spacers.
In a very preferred embodiment, this face-to-face weaving machine is designed to weave two fabrics with pile loops and a cut pile simultaneously. Preferably, this occurs according to a method according to the present invention, as described hereafter in the patent application.
In a most preferred embodiment, this weaving machine is provided with a four-position jacquard machine, preferably an open-shed-four-position jacquard machine.
In the European patent publication EP 0 974 690 a method is also described, according to which two loop pile fabrics are woven simultaneously on a face-to-face weaving machine where each time three weft yarns are inserted above one another per weft insertion cycle. Two backing fabrics are woven above one another from warp yarns and weft yarns, while loop weft yarns, by means of upper and lower lancets, are kept at a distance from th
Debaes Johny
Moulin Gilbert
Calvert John J.
Creighton Wray James
Muromoto Jr. Robert H.
Narasimhan Meera P.
Van de Wiele N.V. Michel
LandOfFree
Weaving machine and method for weaving fabrics with pile loops does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Weaving machine and method for weaving fabrics with pile loops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Weaving machine and method for weaving fabrics with pile loops will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3302151