Reed with doglegged blades for water jet loom and weaving method

Details Reed with doglegged blades for water jet loom and weaving method Reed with doglegged blades for water jet loom and weaving method

1998-08-12

2000-11-21

Falik, Andy

Textiles: weaving

Weft manipulation

Lays or beat-ups

D03D 4962, D03D 4732

Patent

active

061488682

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a reed for a water jet loom, which reed is used for weft insertion by feeding the weft by means of a stream of water ejected from a nozzle disposed in the water jet loom. Further, the present invention relates to a method of weaving a thermoplastic synthetic fiber fabric, using the above reed, and more specifically, to a method of weaving a thermoplastic synthetic fiber fabric using, as warps, soft-twisted multi-filament yarns composed of a polyester or some other thermoplastic synthetic fiber or substantially zero-twisted multi-filament yarns having interlaced tie points formed by interlacing and composed of a polyester or some other thermoplastic synthetic fiber.
2. Technical Background
As the weaving speed of a shuttleless loom increases, naturally, it is required to increase the reciprocation rate of the reed. However, when it is attempted to rock the reed at a high reciprocation rate, a large inertial force works on the reed. For controlling the occurrence of inevitable vibration, etc., caused by the above inertial force, it is therefore necessary to increase the rigidity of the reed or decrease the weight thereof.
A water jet loom, which permits the flying of a weft by means of ejected water and therefore can serve to decrease the shedding amount of warps, is advantageous in that the height (lengthwise dimension) of the reed can be decreased and that the reed can be decreased in weight. On the other hand, in an air jet loom and a rapier loom, increase of the shedding amount of warps is required more because the stability of flying of a weft is poor, and the above problems such as vibration, etc., caused by the reciprocation of the reed is therefore more serious. For decreasing the above problems of an air jet loom and a rapier loom having a large movement stroke of the reed, therefore, an attempt has been made to curve the upper portion of a reed blade as shown in FIG. 1-a so that the height (lengthwise dimension) of the reed and the weight thereof are decreased. Further, FIG. 1-b shows a side view of the reed used in an air jet loom.
Those advantages which are produced by decreasing the height of the reed will be explained in detail with reference to FIG. 1-a showing a state in which warps 6 are allowed to form a vertical open shed by forming a shedding angle .alpha. with a reed blade. When a reed blade 22 not curved toward the cloth-fell and shown by a chain line in the Figure and a reed blade 1 curved toward the cloth-fell and shown by a solid line in the Figure are compared, the following will be understood.
That is, since the warps 6 are vertically opened so as to form a shedding angle .alpha., the linear reed blade 22 is required to have a reed height H'. In contrast, for the reed blade 1 curved toward the cloth-fell so as to have the form of a "dogleg", a reed height H is sufficient. The reed can therefore be decreased in height, and it can be decreased in weight.
As is clearly shown in a geometrical relationship between the shedding angle .alpha. and the curved reed blade 1 in FIG. 1-a, however, the effect on the decreasing of the reed height H is high only when the shedding angle .alpha. is inevitably large like an air jet loom and a rapier loom. When the shedding amount of warps can be small like a water jet loom, i.e., when the shedding angle .alpha. is small, not only almost no effect is produced, but also there is an undesirable indirect influence that an additional production step is required for bending the reed blade toward the cloth-fell so that the production cost increases to that extent. It has been therefore not at all considered to produce a reed blade having a form bending toward the cloth-fell in a water jet loom.
In the reed of a water jet loom which is operated at a high speed, it is required to increase the reed blade in width or in thickness for overcoming problems caused by the above deficient rigidity. However, when the reed blade is increased in thickness on one hand, the space throu

REFERENCES:
patent: 1686448 (1928-10-01), Hargrove et al.
patent: 3379223 (1968-04-01), Fend
patent: 3425459 (1969-02-01), Volpe
patent: 4478259 (1984-10-01), Honegger
patent: 4694867 (1987-09-01), Glendelman et al.
patent: 5570725 (1996-11-01), Musha et al.

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