Textiles: weaving – Weft manipulation – Tensions
Reexamination Certificate
2000-05-18
2001-03-27
Falik, Andy (Department: 3741)
Textiles: weaving
Weft manipulation
Tensions
C139S302000, C139S370200, C139S430000
Reexamination Certificate
active
06206051
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of removing a leading end part of a weft yarn picked on a shuttleless loom, such as a fluid jet loom, and a weft yarn end removing mechanism for removing a leading end part of a picked weft yarn.
2. Description of the Related Art
Referring to
FIG. 1
, a leading end part of a weft yarn
3
picked on a shuttleless loom
1
is caught by catch cords
4
to hold the picked weft yarn
3
tight, and the picked weft yarn
3
is beaten up with a reed
6
. Subsequently, the leading end part of the weft yarn
3
extending between a selvage of a fabric
5
on an arriving side opposite a picking side and the catch cords
4
is cut off by a cutting device
7
. Portions of the catch cords
4
used for catching leading end parts of picked weft yarns
3
are disposed of together with the cut leading end parts of the picked weft yarns
3
. Thus, the catch cords
4
are not used for constructing the fabric
5
, but are used only for weaving the fabric
5
and consumed wastefully.
FIG. 2
shows a weft yarn end removing mechanism previously proposed to avoid the wasteful consumption of yarns that do not contribute to constructing the fabric
5
, such as the catch cords
4
. This weft yarn end removing mechanism catches a leading end part of a picked weft yarn
3
by a tightening nozzle
8
to hold the picked weft yarn
3
tight, transfers the leading end part from the tightening nozzle
8
to a suction device
9
, and cuts the leading end part of the weft yarn
3
off the picked weft yarn
3
at a position between the selvage of the fabric
5
and the suction device
9
by a cutting device
10
as shown in FIG.
2
. The function of the catch cords
4
is replaced with the cooperative operation of the tightening nozzle
8
and the suction device
9
.
When the weft yarn end removing mechanism shown in
FIG. 2
is used, one end of the reed
6
on the side of the suction device
9
must be spaced from the suction device
9
so that the reed
6
may not strike against the suction device
9
during a beat-up operation. Consequently, reeds of different lengths must be prepared for weaving fabrics of different widths, respectively.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a method of removing a weft yarn end capable of removing a leading end part of a picked weft yarn without using any catch cords and without placing any restrictions on the length of a reed.
Another object of the present invention is to provide a weft yarn end removing mechanism for carrying out the method of removing a weft yarn end.
The present invention is intended to be applied to a shuttleless loom that holds a leading end part of a picked weft yarn by a weft yarn tightening device disposed on an arriving side opposite a picking side, and beats up the tight picked weft yarn into the cloth fell of a fabric by a reed.
The shuttleless loom has a weft yarn sucking device and a weft yarn cutting device. The weft yarn sucking device is disposed nearer to a take-up with respect to the cloth fell to hold a leading end part of a weft yarn picked and beaten up into the cloth fell. The weft yarn cutting device is disposed nearer to the take-up with respect to the cloth fell, and cuts a leading end part of the picked and beaten up weft yarn projecting from the selvage of the fabric on the arriving side in a cutting region between the selvage of the fabric and the weft yarn sucking device.
According to a first aspect of the present invention, a method of removing a weft yarn end includes the steps of: sucking a leading end part of a picked weft yarn being shifted toward a cloth fell of a fabric by a beat-up motion into a weft yarn sucking device through a first suction opening of the weft yarn sucking device, lying on a path of the picked weft yarn and extending (i.e. opening and facing) in a picking direction; holding the leading end part of the weft yarn beaten up into the cloth fell in a second suction opening of the weft yarn sucking device, continuous with the first suction opening, lying opposite to a selvage of the fabric and extending (i.e. opening or facing) in a take-up direction; and cutting the leading end part of the weft yarn extending between the selvage of the fabric and the second suction opening off the weft yarn beaten up into the cloth fell.
According to a second aspect of the present invention, a weft yarn end removing mechanism includes a weft yarn sucking device having a first suction opening and a second suction opening. The first suction opening lies on a path of the picked weft yarn and extends in a picking direction. A leading end part of a picked weft yarn being shifted toward a cloth fell of a fabric by a beat-up motion is sucked through the first suction opening into the weft yarn sucking device. The second suction opening is continuous with the first suction opening, lies opposite to a selvage of the fabric, extends in a take-up direction and holds the leading end part of the weft yarn beaten up into the cloth fell.
The leading end part of the picked weft yarn arrived at the arriving side is held and is kept in a tight state by a weft yarn tightening device fastened to a slay. The weft yarn thus held by the weft yarn tightening device is shifted toward the cloth fell by a beat-up motion. Upon the arrival of the weft yarn at a position near the cloth fell, the leading end part of the weft yarn is sucked through the first suction opening into the weft yarn sucking device. The leading end part of the weft yarn sucked through the first suction opening into the weft yarn sucking device is transferred to and held in the second suction opening as the beat-up motion proceeds. At this stage, the leading end part of the weft is inclined in the take-up direction with respect to the picking direction. The cutting device cuts successively the leading end parts of successively picked weft yarns that enter a cutting region successively. The leading end part cut off the weft yarn woven into the fabric is delivered by the weft yarn sucking device to a dust box by air currents.
REFERENCES:
patent: 3744533 (1973-07-01), Yano et al.
patent: 4498504 (1985-02-01), Allen et al.
patent: 4549582 (1985-10-01), Kung et al.
patent: 4607667 (1986-08-01), Gibson
patent: 5224521 (1993-07-01), De Jagger
patent: 5226453 (1993-07-01), Bamelis
patent: 5735316 (1998-04-01), Hehle
patent: 6076563 (2000-06-01), Wahhoud et al.
patent: 6082413 (2000-07-01), Scori et al.
patent: 9-291438 (1997-11-01), None
Falik Andy
Tsudakoma Kogyo Kabushiki Kaisha
Wenderoth , Lind & Ponack, L.L.P.
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