Textiles: manufacturing – Warp preparing or handling – Machine replenishing
Patent
1991-10-11
1993-10-05
Crowder, Clifford D.
Textiles: manufacturing
Warp preparing or handling
Machine replenishing
D03J 114
Patent
active
052493393
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an apparatus for drawing in warp threads into harness elements of a weaving machine, having a needle-shaped drawing-in member, driveable in an oscillating manner, for the warp threads.
BACKGROUND
In known apparatuses of this type, the drawing-in member is formed by a so-called drawing-in needle which has a hook-like end, by means of which the warp threads are caught and drawn in. Quite apart from the fact that there is always the risk when a hook-shaped drawing-in needle of this type is used that a thread will slide out of the needle and therefore will not be drawn in or will be drawn in only incompletely, these drawing-in needles are not advantageous from the textile point of view. This is because the warp threads are deflected practically through 180.degree. in the naturally very thin hook-shaped end and slide via their deflection edge during the drawing-in, which means a not inconsiderable stress and possibly also an effect on the thread at its surface.
SUMMARY OF THE INVENTION
An object of this invention is to provide drawing-in apparatus so constructed and operated that the warp threads are drawn in as carefully and reliably as possible.
This object is achieved according to the invention in that the drawing-in member has a clamping gripper.
Since the clamping gripper securely clamps the warp threads and does not merely hook into them, reliable drawing-in of all types of warp threads is ensured. In addition, these warp threads are protected to the greatest extent, since the warp threads are clamped only at one location, but are otherwise not stressed by additional friction.
A preferred embodiment of the drawing-in member is characterized in that the clamping gripper is carried by a flexible gripper band and in that a channel-like guide is provided for the drawing-in member.
With such a drawing-in member and guiding channel, a drawing-in machine may operate at higher speed and with greater reliability. The mass of the drawing-in member may be small and the drawing-in member by be guided exactly. In this way, the drawing-in member is exactly positioned even at high drawing-in frequencies so that incorrect drawing-in is practically prevented.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail below with reference to an exemplary embodiment and the drawings, in which:
FIG. 1 shows a perspective overall representation of a drawing-in machine according to the invention,
FIG. 2 shows a perspective representation of the drawing-in module of the drawing-in machine of FIG. 1,
FIG. 3 shows a representation of the drawing-in member,
FIG. 4 shows a view in the direction of arrow IV in FIG. 2,
FIG. 5 shows a view in the direction of arrow V in FIG. 4,
FIG. 6 shows a section along line VI--VI in FIG. 5,
FIGS. 7a-7c show various cross-sections through the guide channel, shown in FIGS. 4 to 6, for the drawing-in member,
FIG. 8 shows a detail from FIG. 7c to an enlarged scale,
FIG. 9 shows a sectional representation of the drive of the drawing-in member,
FIG. 10 shows a variant of FIG. 5,
FIG. 11 shows a section along line XI--XI in FIG. 10; and
FIG. 12 shows a detail of FIG. 2.
DESCRIPTION OF PREFERRED EMBODIMENT(S)
According to FIG. 1, the drawing-in machine according to the invention consists of a mounting stand 1 and various subassemblies arranged in this mounting stand 1, each of which subassemblies represents a functional module. A warp-beam truck 2 with a warp beam 3 arranged thereon can be recognized in front of the mounting stand 1. The warp-beam truck 2 is connected to a so-called lifting device 4 for holding a frame 5, on which the warp threads KF are clamped. This clamping is effected before the actual drawing-in and at a location separate from the drawing-in machine, the frame 5 being positioned at the bottom end of the lifting device 4 directly next to the warp beam 3. For the drawing-in, the warp-beam truck 2 together with warp beam 3 and lifting device 4 is moved to the so-called setting-up side of the drawing-in mac
REFERENCES:
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patent: 3777339 (1973-12-01), Fleischer et al.
patent: 4014083 (1977-03-01), Heinz
patent: 4525906 (1985-07-01), Tovenrath et al.
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patent: 4894893 (1990-01-01), Okuda
patent: 5084950 (1992-02-01), Okuda
patent: 5088523 (1992-02-01), Buchel et al.
patent: 5111560 (1992-05-01), Sato
Schelling Raymond
Wilhelm Hans
Crowder Clifford D.
Worrell Jr. Larry D.
Zellweger Uster AG
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