Winding – tensioning – or guiding – Unidirectional winding and unwinding – Fixed number of windings on winding surface
Patent
1998-07-22
2000-03-28
Walsh, Donald P.
Winding, tensioning, or guiding
Unidirectional winding and unwinding
Fixed number of windings on winding surface
2423661, 2423642, 2424181, B65H 5132
Patent
active
060420405
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a tension adjusting mechanism for cord or the like (for example, string) to be put on a fiber machine or the like.
BACKGROUND OF THE INVENTION
Hitherto a system of adjusting frictional force between a cord and a frictional roller with a weight is known as a tension adjusting mechanism for cord or the like (such as string) to be put on a fiber machine or the like. Proper tension is given to string depending on its kind from the condition in which tension is hardly loaded on the string being pulled out of a delivery bobbin. The proper value of tension given to the string is related, for instance, to the denier number of the string itself, and is normally as extremely small as several gf through several tens gf.
Since the adjustment of tension in the conventional system is conducted sensuously by the position and the like of the weight, the adjustment to a proper value is not usually obtained. Namely, improper tension setting causes the string to be worn out by friction and thereby gives a bad influence on the quality.
It is therefore an object of the present invention to provide a tension adjusting mechanism for cord or the like which can adjust tension more appropriately than conventional ones.
SUMMARY OF THE INVENTION
The tension controlling mechanism of cord according to the present invention includes a wrapping roller for cord or the like, which is formed such that it can be rotatingly driven by a drive means, detects tension on the cord after leaving the wrapping roller, and controls the drive means so as to make the detected tension approach a proper value suitable for the cord. And the mechanism employs a motor as the driving means, uses mechanical loss of the motor as load when the wrapping roller rotates, and control the motor in output within a range of loss load.
Since the mechanism is designed to detect tension on the cord after leaving the wrapping roller and control the driving means so as to make the detected tension approach a proper value suitable for the cord, controlling the driving means allows tension to be adjusted to a proper value.
Furthermore, since the mechanism employs a motor as the driving means, uses mechanical loss of the motor as load when the wrapping roller rotates, and controls the motor in output within a range of loss load, load can be applied to the roller efficiently in power saving.
By controlling the driving means, a peripheral speed of the wrapping roller can be controlled. With such constitution, tension on the cord can be adjusted by a simple means of controlling a peripheral speed of the wrapping roller.
The tension controlling mechanism may include a wrapping roller on the input side of the cord and another wrapping roller on the output side thereof, and be constituted such that tension is produced on the cord between the rollers, and be formed such that at least the wrapping roller on the output side can be rotatingly driven by the driving means. In such constitution, even when there are some tension fluctuations on the cord being pulled out from the delivering bobbin, the influence of such original tension fluctuations on the cord after leaving may be relieved by the tension on the cord produced between the input side and output side wrapping rollers.
The tension controlling mechanism may be constituted such that the peripheral speed difference between the input side and output side wrapping rollers can cause to produce tension on the cord between the wrapping rollers. In such constitution, tension can be produced with an easy means on the cord between the input side and output side wrapping rollers.
The tension controlling mechanism may also be constituted such that the peripheral speed difference between the input side and output side wrapping rollers can cause the cord to be extended therebetween. In this construction, the cords can be extended simultaneously.
The wrapping roller on the input side and the wrapping roller on the output side may be formed to be rotated coaxially and integrally, and
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Agaya Tomohiro
Kurita Yasushi
Nitta Corporation
Pham Minh-Chau
Walsh Donald P.
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