Textiles: weaving – Special-type looms – Open-back shed
Patent
1980-07-23
1982-10-26
Jaudon, Henry
Textiles: weaving
Special-type looms
Open-back shed
D03D 3700
Patent
active
043556663
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
TECHNICAL FIELD
This invention relates to a shuttle propelling mechanism in a circular loom.
BACKGROUND ART
Bags formed from woven fabrics of a plain weave structure utilizing tapes of synthetic resins, such as polypropylene and polyethylene resins or synthetic resin strands, such as multifilament yarns or cords of synthetic resins, as warps and wefts have been widely used for transportation and storage of granules, such as grains, sugar fertilizers and synthetic resin pelletes. This is because these bags are strong and light in weight. These bags can be made from a tubular fabric produced by using an ordinary power loom, but there is a tendency to use circular looms having a high weaving efficiency for the manufacture of the tubular fabric to be formed into these bags. Therefore, there have been various attempts to use of circular looms in not only Japan but also other industrially advanced countries. As a typical instance of a tubular-fabric practical circular loom, there can be mentioned 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.
As is well known, in a circular loom of the above-mentioned type, 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.
However, if waste yarns are mingled in the warps or some of the warps are split in the lengthwise direction, the warps are often entangled with each other so that they can not be normally opened. In the conventional circular loom, a shuttle propelling engaging means, such as a press roll, is directly connected to a rotary member rotating in the shuttle propelling direction around the central axis of a shuttle guide member, for example, a cam drum wheel having a cam rail mounted on the peripheral face thereof to operate healds. Accordingly, when the warps are not opened for the above-mentioned reasons, the shuttles are pushed under a high pressure into the warps which are not opened but kept in closed condition. Accordingly, in this case, there are caused various troubles such as breakage of warps and damage to the shuttle propelling engaging means and a supporting mechanism therefor.
DISCLOSURE OF INVENTION
It is a primary object of the present invention to provide a shuttle propelling mechanism in a circular loom, in which the above-mentioned defects of the conventional circular loom can be eliminated, and when warps are not normally opened by entanglement or the like, breakages of warps or damage to the shuttle propelling engaging means or a supporting mechanism therefor by the pressing force of the shuttles can be prevented.
In accordance with the present invention, this object can be attained by a shuttle propelling mechanism in a circular loom, which is characterized in that a shuttle propelling engaging means is supported on a supporting member rotatably pivoted around the central axis of a shuttle guide member and the rotation of the supporting member is restrained by rotation restraining means urged by urging means, such as a spring, toward the rotation direction of rotary member rotating around the central axis of the shuttle guide member in the shuttle propelling direction, such as a cam drum wheel. This rotation restraining means is arranged so that when an excessive load is imposed on a support in the rotation direction thereof, the rotation restraining means is displaced by the urging means, such as a spring, to release the restraint on the support and rotary member with respect to the rotatio
REFERENCES:
patent: 2601358 (1952-06-01), Ancet
patent: 2619988 (1952-12-01), Pelce
patent: 2714396 (1955-08-01), Casati et al.
patent: 2813547 (1957-11-01), Rabeux et al.
patent: 3871413 (1975-03-01), Torii
Jaudon Henry
Torii Winding Machine Co., Ltd.
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