JPH0412404Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a winding angle setting device for a thread, and more particularly to a winding angle setting device suitable for measuring the coefficient of friction between a thread and a guide.

The coefficient of friction between the yarn and the guide is determined by the yarn tension at the exit side of the guide T ₁ (g), the yarn tension at the entrance side T ₂ (g),
From the wrapping angle θ (radians) of the thread around the guide,
Calculate using the well-known Amonton's theorem.

That is, the friction coefficient μ is determined by the formula μ=(1/θ)·In(T ₁ /T ₂ ). As is clear from this equation, when measuring the coefficient of friction, the thread tensions T ₁ and T ₂
At the same time, it is necessary to accurately set the wrapping angle θ. A thread winding angle setting device is used in such cases.

Conventionally, as shown in FIG. 1, the winding angle θ of the thread with respect to the guide is determined by arranging two guide rollers 2 and 3 in parallel below the guide 1 to be measured. The thread 4 is passed between the guide rollers 2 and 3, and the guide rollers 2 and 3 are moved and adjusted independently in the direction of the arrow. However, since such a conventional device requires the two guide rollers to be moved independently, it is not only difficult to use, but also makes it difficult to always obtain a constant wrapping angle.

The purpose of this invention is to provide a thread wrapping angle setting device which solves the above-mentioned drawbacks of the conventional setting device and allows the setting of the wrapping angle to be easily and always constant.

In order to achieve the above object, this invention is a device for setting the winding angle of a thread with respect to guides to be measured arranged oppositely, which includes a support body and a holder that rotatably supports the support body. , at least one guide roller provided on the support and at a position away from the center of rotation of the support; and means for fixing the support to the holder at any rotational position. characterized in that the support and the holder are provided with a scale for reading the winding angle of the thread that is passed between the guide roller and the guide to be measured, with respect to the guide to be measured; A thread winding angle setting device is provided.

To explain one embodiment of the setting device of this invention,
In FIG. 2 (schematic front view) and FIG. 3 (schematic longitudinal cross-sectional view), a disc-shaped support 5 is rotatably supported by a ring-shaped holder 7 screwed to a panel 6. There is. The holder 7 and the support 5 are provided with scales 8 and 9 for reading the rotation angle of the support 5. These scales 8 and 9 are attached so as to directly represent the winding angle θ of the thread 4 with respect to the guide 1 to be measured. In other words, the wrapping angle θ can be directly read from the scales 8 and 9. In addition, the support 5
Two guide rollers 2 and 3 are attached symmetrically to the rotation center X thereof. 10
is a set screw, the tip of which comes into contact with the panel 6, so that the support body 5 can be fixed at any rotational position.

Now, when setting the winding angle of the thread, as shown in FIG. Pass it through the measurement guide 1 and guide roller 3. Next, after turning the support 5 to set an arbitrary wrapping angle θ, the support 5 is fixed with a set screw 10. The wrapping angle θ is read from scales 8 and 9 on the holder 7 and the support 5. In this state, the thread 4 is run and the tension on the exit side of the guide 1 to be measured, that is, the thread tension between the guide 1 to be measured and the guide roller 3 is T ₁
and the yarn tension on the entrance side, that is, the yarn tension _T2 between the guide roller 2 and the guide 1 to be measured. This measurement may be performed by any conventionally known method. Then, from these thread tensions T ₁ and T ₂ and the wrapping angle θ read by the scales 8 and 9, the coefficient of friction μ between the thread 4 and the guide 1 to be measured is determined using the above-mentioned Amonton's theorem. .

In the above embodiments, the support does not necessarily have to be disc-shaped. For example, a rod-shaped support may be used, the rotation center X may be set at the center in the longitudinal direction, and guide rollers may be attached to both ends in the longitudinal direction.

Furthermore, two guide rollers are not necessarily required. For example, in FIG. 2, only one guide roller 2 may be provided to guide the thread threaded around the guide 1 to be measured in the direction shown by a dotted line or a two-dot chain line. That is, at least one guide roller may be provided.

The setter of this invention is suitable for use in various processes in the textile industry. for example,
It is useful for setting the wrap angle when measuring the friction coefficient of the guide in the process of developing a guide that does not cause resistance or damage to the thread. Further, when it is desired to measure the friction coefficient of the guide at an arbitrary wrapping angle, it can be used in conjunction with a friction coefficient measuring device.

As explained above, the setting device of this invention includes a support, a holder that rotatably supports the support, and a position on the support that is away from the center of rotation of the support. and means for fixing the support to the holder at an arbitrary rotational position, and the support and the holder are provided with scales for reading the winding angle of the thread with respect to the guide to be measured. Therefore, by placing it opposite the guide to be measured, passing the thread between the guide roller and the guide to be measured, and simply rotating the support to an arbitrary position, the thread can be adjusted to the guide to be measured. The wrapping angle can always be set constant,
As with the conventional setting device described above, moving and adjusting the two guide rollers independently while measuring the wrap angle eliminates the hassle.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing a conventional setting device, FIGS. 2 and 3 are schematic views showing an embodiment of the setting device according to the invention, FIG. 2 is a front view, and FIG.
The figure is a longitudinal sectional view. 1... Guide to be measured, 2, 3... Guide roller, 4... Thread, 5... Support, 6... Panel, 7
...Holder, 8, 9...Scale, 10...Set screw.

Claims (1)

[Scope of utility model registration request] A device for setting a winding angle of a thread with respect to a guide to be measured arranged opposite to each other, comprising a support body, a holder that rotatably supports the support body, and a The support body and the holder include at least one guide roller provided at a position away from the center of rotation of the support body, and means for fixing the support body to the holder at an arbitrary rotation position; 1. A thread wrapping angle setting device, characterized in that the thread wrapping angle setting device is provided with a scale for reading the wrapping angle of the thread that is passed between the guide roller and the measuring target guide with respect to the measuring target guide.