Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1995-03-07
1997-02-18
Mansen, Michael R.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
2425718, 2425761, B65H 7530, B65H 7524
Patent
active
056034636
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to improvements in a bobbin holder used for taking up a linear material such as a yarn or a steel wire, and a sheet-like material such as a synthetic resin film, a fabric and paper, and in a take-up device equipped with this bobbin holder. More particularly, the present invention relates to a bobbin holder which can accomplish high speed take-up while the bobbin is firmly gripped, without increasing the inner diameter of the bobbin, and to a take-up device equipped with this bobbin holder.
BACKGROUND ART
Recently, in a take-up device of a yarn used for a synthetic fiber production process, for example, higher performance has been sought so as to improve production efficiency, to reduce the cost of production and to improve and discriminate yarn quality. A take-up device equipped with a bobbin holder to which a bobbin having an entire length of greater than 1,000 mm is fitted and which can take up a yarn at a high speed of not lower than 6,000 m/min has been accomplished nowadays.
However, a further improvement in productivity and the reduction of the cost of production are extremely important factors for the synthetic fiber industry, and development of a bobbin holder of a so-called "small diameter elongated type", which can at a time grip a large number of small diameter bobbins capable of reducing the bobbin cost, and which can attain high speed take-up, and a take-up device using such a bobbin holder, has been desired.
The bobbin holders used for recent yarn take-up devices have been elongated in accordance with the requirement described above and have been used predominantly in the range of low number of revolutions which is lower than a high-order critical speed (hereinafter merely called the "critical speed (Nc)") which exceeds a low critical speed and which cannot be exceeded because vibration energy is excessively great.
An example of the conventional bobbin holders of such a type is described, for example, in Japanese Patent Laid-Open No. 225268/1990, and its general construction is shown in FIG. 11. Namely, the conventional bobbin holder 10 is fixed to the extreme left end portion of a bobbin holder shaft 14 directly coupled to a motor shaft 12 through a coupling 13, and comprises a rotary cylinder 15, a plurality of flexible rings 16a to 16h (eight rings are shown in the drawing) inserted to the outer periphery of the rotary cylinder, cylindrical spacers 17a to 17g for positioning the flexible rings, a front cover 17 for pushing the flexible rings 16a to 16h in the right-hand direction in the drawing and a push mechanism 20 comprising a coned disc spring 18 and a piston 19, for imparting the push force to the front cover in the right-hand direction in the drawing. Feed ports 12a and 14a for supplying compressed air are disposed in the motor shaft 12 and in the bobbin holder 14, respectively, and the flexible rings 16a to 16h are integrated by bonding a steel ring 22 to both side surfaces of a rubber ring 21 as shown in FIG. 12.
When bobbins 23 are gripped by the bobbin holder 10, the front cover 17 is moved to the right in the drawing by the push force of the coned disc spring (expanding force in the right-hand direction in the drawing) so as to compress each flexible ring 16a, 16h from the direction of both side surfaces. Since the volume of the rubber ring 21 hardly changes in this instance, the rubber ring increases its diameter and undergoes deformation by a volume corresponding to the change of compression from the direction of both side surfaces, and grips the bobbins 23. In other words, the greater the thickness of the rubber ring in the radial direction, the greater becomes the change of the volume with respect to an equal compressive change from the direction of the side surfaces, and deformation and the increase of the diameter corresponding to this change can be obtained to permit a strong grip on the bobbin. For this reason, the thickness of the flexible ring 16 according to the prior art becomes as great as 7 to 10 mm, and flexible rings ha
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Hayasi Tosihiro
Kumo Ichiro
Okumura Kozo
Sano Takao
Mansen Michael R.
Toray Industries Inc.
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