Textiles: weaving – Warp manipulation – Shedding
Reexamination Certificate
2000-04-19
2001-01-23
Falik, Andy (Department: 3744)
Textiles: weaving
Warp manipulation
Shedding
Reexamination Certificate
active
06176270
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to paired heddles for weaving looms for the production of thickened warp in woven fabrics.
The heddles are paired on the weaving machine to facilitate the weaving of fabric with a heavy warp. Considering a single heddle pair, one of the two heddles is so shaped that its thread eye is positioned in a rear row, and the other heddle of the pair is so shaped that its thread eye is positioned in a forward row. Due to the offset of the thread eyes displaced from the center line of the frame bars on which the heddle pair is mounted upright, such arrangement assures that the passage for the warp even at the broadest part of the heddle, i.e., in the area of the thread eyes, is substantially increased.
Such heddles mounted in pairs are known in the art and are set forth in
FIGS. 1
,
2
and
9
of the drawings which will be described in more detail hereinafter.
Modern day weaving machines reach very high speeds of rotation resulting in that the loom shafts severely deform in operation because of the high dynamic loadings. This deformation reaches such a level that the play at which the heddles can arrange themselves orderly in a row on the heddle carrier bars of the loom shafts, disappears, and indeed is overcome. When the heddle play is overcome the heddles are stressed in tension along the length thereof. Heddles of modern design which are structured mainly to be symmetrical therefore are deformed into a shape which, at least partially, is inappropriate for the structural loads. Those heddles in the drawings designated
1
,
8
,
32
and
34
have a high degree of rigidity as compared with heddles
2
and
9
. As a result heddles
1
,
8
,
32
and
34
tend to rapidly deform under tension.
Shown in
FIG. 1
is a prior art heddle pair comprising heddles
1
and
2
respectively having centrally located thread eyes
4
and
6
respectively lying along the central axis of that portion of each heddle body which comprises an elongated shaft. The open thread eyes at opposing ends of the shaft provide, as is known in the art, for mounting the heddles in overlying relationship on upper and lower frame bars and/or shafts of the weaving machine (not shown). Thus the thread eyes are offset, to the left and to the right, from the central axis of the frame extending through the upper and lower frame bars.
Heddles
1
and
2
each has a row hole
17
as well as a stamping
18
, as known in the art.
Similarly, the prior art heddle pair
8
,
9
shown in
FIG. 2
is essentially the same as aforedescribed with respect to
FIG. 1
except that the end eyes at opposing ends of the shaft of the heddle body of each heddle are C-shaped rather than J-shaped. Thus heddles
8
and
9
respectively contain thread eyes
4
and
5
midway between their ends. In operation, heddle
1
of the heddle pair
1
,
2
of
FIG. 1
as well as heddle
8
of the heddle pair
8
,
9
of
FIG. 2
, each exhibit a high tensile rigidity in a lengthwise direction, but have a tendency toward rupturing lengthwise, while the other heddles of the pairs, i.e.,
2
and
9
, respectively, remain undamaged under severe loadings. The reason for this difference in operational behavior could very well be attributed to the fact that the two heddles,
2
and
9
, in the area between the end eyes and the thread eyes, i.e., between the end eyes and the heddle shaft, exhibit more resilience as compared to their respective heddles
1
and
8
.
SUMMARY OF THE INVENTION
Considering the aforestated disadvantages, it is the object of this invention to provide a heddle, mounted in pairs, which for different types of heddle pairs have enhanced tensile strengths, i.e., a like modulus of elasticity for the heddles of each pair. In keeping with this objective care must be exercised in retaining the full capacity to function as modern heddles, i.e., the heddles must be capable of operating on current weaving machines, they must be transportable in the same manner as before, and they must be able to be installed on the same weaving frame shafts. In accordance with the invention, each heddle of a pair of heddles for a weaving machine comprises a body having an elongated shaft containing a thread eye, and for one type of heddle has open end eyes at opposing ends of the shaft. The end eyes open toward one side of the body. The heddle body of at least one heddle of the pair has a recess adjacent at least one of its end eyes, the recess opening outwardly at a side of the body opposite the one side toward which the thread eye opens. The recess is at a location between the adjacent end eye and the heddle shaft for increasing the resiliency of the heddle along the length thereof. For the heddle pair having closed end eyes at opposite ends of the shafts, the body of at least one heddle of the pair has a recess adjacent at least one of the end eyes opening toward an outer side of the pair. Such recess is likewise at a location between the adjacent end eye and the heddle shaft for increasing the resiliency of the heddle along the length thereof.
Thus the objective of the invention is achieved so that the area adjacent the end eyes of one or both heddles of the pair, which area is relatively rigid as to extension, is rendered spring-like resilient, specifically by shaping that area between the adjacent end eye and the heddle shaft.
Thus one or both heddles of the pair, at a location between the thread eye and its end eye, the nearer it approaches the end eye or the area of the end eye exhibits a change in shape, such as a recess or an inwardly bowed section. This area of the end eye is otherwise designed to be open.
The open recess provided at such location for one or both heddles of the pair in the area adjacent the end eye or eyes, may be in the form of a bowed portion which imparts a spring-like characteristic to that area.
Other objects, advantages and novel features of the invention will become more apparently from the following detailed description of the invention when taken into conjunction with the accompanying drawings.
REFERENCES:
patent: 1970175 (1934-08-01), Kaufmann
patent: 2047511 (1936-07-01), Kaufmann
patent: 5078184 (1992-01-01), Koch
patent: 5176183 (1993-01-01), Koch
Dykema Gossett PLLC
Falik Andy
Grob Horgen AG
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