Textiles: weaving – Special-type looms – Open-back shed
Patent
1980-07-23
1982-12-28
Jaudon, Henry
Textiles: weaving
Special-type looms
Open-back shed
D03D 3700
Patent
active
043656510
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
BACKGROUND OF THE INVENTION
This invention relates to an improved shuttle utilized for a circular loom.
DESCRIPTION OF THE PRIOR ART
Recently, a circular loom has been recognized as one of the most practical weaving machines for producing so-called tubular fabric, which is preferably used as a material-fabric for making a transportation container or a storage container of granules, such as grains, sugar fertilizers and synthetic resin pelletes. As a practical circular loom, the circular loom disclosed in U.S. Pat. No. 3,871,413 or a circular loom which has been manufactured and sold by the British Company, Fairbairn Lawson Machinery, Ltd. are well known.
In the above mentioned known circular looms, an even number of shuttles are mounted on an annular shuttle guide member so that they can travel along this guide member, and engaging means to be engaged with corresponding shuttles, respectively, such as press rollers, are moved along the shuttle guide member. Each shuttle is pressed by the corresponding engaging means and is propelled along the shuttle guide member. Wefts taken out from the respective shuttles are fabricated with warps sequentially opened on both the upper and lower sides of the respective shuttles by healds, and a tubular fabric is thus formed.
In the circular loom, for an increase in the production-efficiency, it is required to use so-called large-package-bobbins. However, since it is obvious that, if the size of the yarn package becomes larger, the size of the shuttle becomes larger and the force of gravity and the centrifugal force of the shuttle become larger in operation, stable support of a large shuttle on the annular shuttle guide member while the shuttle is travelling around the above mentioned shuttle guide member is required.
According to the experience of the inventors of the present invention, the shuttles utilized for the above-mentioned circular looms are not stably supported to the extent required for smooth operation and do not eliminate the trouble involved in the manual shuttle setting operation.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide a shuttle having a mechanism for stably supporting the shuttle on the circular loom. It is another object of the present invention to provide a shuttle which can be easily handled manually at the time of shuttle setting operation.
In accordance with the present invention, each shuttle is mounted on a circular loom in such a way that a shuttle is mounted at a position between an annular guide member and an inside annular guide way, which are arranged concentrically with each other, and guide elements are capable of smoothly contacting with the annular guide member and inside annular guide way, respectively. In this shuttle, a main body of the shuttle is provided with a pair of brackets for rotatably supporting a bobbin and a lever pivotably mounted on the main body. One of the above-mentioned guide elements, which is capable of rotatably contacting the inside annular guide way, is rotatably mounted on a free end portion of the lever. One of the ends of a connecting lever is pivoted on the main body and the other end thereof is turnably connected to the lever by a pin. To attain the primary object of the present invention, in the shuttle of the present invention, the above-mentioned guide elements comprise lower outside wheels which are rotatably provided on the lower part of the main body and have a rotating axis inclined upwardly and outwardly, respectively, when the shuttle is mounted on the circular loom. Also the outside wheels are supported by said annular guide member in such a manner that said annular guide member bears the force of gravity and the centrifugal force acting on the shuttle when the shuttle is driven by the shuttle propelling mechanism. To attain another object of the present invention, a mechanism for adjusting the length of the connecting lever is provided.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view illustrating one embodiment of a
REFERENCES:
patent: 1357969 (1920-11-01), Pray
patent: 2168385 (1939-08-01), Baumgartner
patent: 2321283 (1943-06-01), Ghetto
patent: 3871413 (1975-03-01), Torii
Jaudon Henry
Torii Winding Machine Co., Ltd.
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