JPH02178176A - Yarn tension giving device for textile machinery - Google Patents

Abstract

PURPOSE:To make yarn extractable with desired unvariable tension by having the yarn released out of a bobbin supported free of rotation passed through both internal and external sides of each of rods annularly arranged in parallel with a bobbin spindle, and taking it out of a yarn guide. CONSTITUTION:In order to wind yarn 22 released out of a bobbin on the circumference of a bobbin 12 supported free of rotation, a number of friction rods 23 in parallel with a rotation axis of the said bobbin are annularly arranged and set up, and a yarn guide 24 taking out the yarn is installed at one end side of the friction rods. The yarn released out of the bobbin is bypassed at the outside of at least one friction rod, and properly passed through both internal and external sides of these plural numbers of friction rods according to requisite tension. If doing like this, if a drawing position of the yarn on the bobbin is moved in the axial direction of the bobbin, a variation of frictional force in each friction rod is almost nothing, so that the yarn can be taken out with constant tension.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention relates to a thread tension applying device for applying the necessary tension to the thread when pulling out the thread wound around the bobbin in a textile machine. It is.

[Prior Art] Conventionally, there have been tensioning devices that apply the necessary tension when pulling out thread wound around a bobbin.
Devices with various mechanisms have been used or proposed.

However, since the winding width of the thread on the bobbin is generally relatively large, there is a problem in that the tension varies depending on the position at which the thread is pulled out. That is, as shown in FIG. 5A or FIG. 5B, the thread 2 wound on the bobbin 1 is
When drawing out the thread, the thread is introduced into the tensioning device 4 through a suitable thread guide 3, while the thread 2 drawn out from the bobbin l
Unless the distance ml between the position of the thread guide 3 that initially guides the thread guide 3 and the center axis of the bobbin l is made as small as possible,
A large space is required to extract the thread from the bobbin. However, when the distance statement is made small, the introduction angle θ of the yarn into the yarn guide 3 changes greatly depending on the pull-out position of the yarn 2, and this change causes a fluctuation in the tension in the yarn 2. Further, increasing the introduction angle θ of the thread 1 in the thread guide 3, that is, changing the direction of the thread in the thread guide 3 by increasing the thickness, will lead to damage to the thread, and cannot be said to be an appropriate means.

[Problem N to be solved by the invention] The technical problem of the present invention is to prevent fluctuations in the pulling tension and damage to the thread, and to stabilize the thread when drawing out the thread while applying tension to the thread wound around the bobbin. To obtain a compact thread tension applying device capable of applying a desired tension to a thread.

[Means for Solving the Problems] In order to solve the above problems, the thread tension applying device of the present invention has the following features:
A large number of friction rods parallel to the axis of rotation of the bobbin for winding the thread unwound from the bobbin are arranged in a ring around the outer periphery of the bobbin which is rotatably supported, and the thread is attached to one end of the friction rod. It is constructed by providing a thread guide to guide the thread.

[Function] In the above-mentioned thread tension applying device, the thread unwound from the rotatably supported bobbin is routed around the outside of at least one friction rod, or depending on the required tension, the thread is moved around the outside of at least one friction rod. After passing through the outside and inside of the rod as appropriate, the thread is led out through the thread guide.

If the thread is drawn out in this way, even if the thread pulling position on the bobbin moves in the axial direction of the bobbin, the inclination of the thread wound around the friction rod will only change slightly, and the resulting change in frictional force will be reduced. This makes it possible to draw out the thread with a constant tension, regardless of the thread's drawing position on the bobbin. Furthermore, since the direction of the thread is not changed significantly in the thread guide, the thread is not damaged by the thread guide.

The thread tension can be changed stepwise by changing the number of friction rods around which the thread drawn from the bobbin is wound.

[Example] Figs. 1 and 2 show an embodiment of the thread tension applying device according to the present invention, and Figs. 3 and 4 show the thread tension applying device attached to the carrier of the pobbin drive device. An example of a three-dimensional cloth weaving device is shown.

In the thread tension applying device ilo, a support shaft 14 that is inserted into a center hole 13 of a bobbin 12 and rotatably supports the bobbin 12 is erected on a carrier 11 of a bobbin drive device to be described later.

The fixing plate 15 attached to the tip of the support shaft 14 has a mounting hole 16 in the center into which the tip of the support shaft 14 is inserted.
Attachment means for attaching to the support shaft 14 with one touch is provided. As this attachment means, as shown in the figure,
A disc spring washer 17 is brought into and out of the step at the tip of the support shaft 14, and a pin 18 is provided protruding from the side surface of the tip. A notch is provided to allow the bottle 18 to pass through when inserting the tip of the support shaft 14, and a curved groove 20 that communicates with the notch 19 and curves laterally is provided. To attach the fixing plate 15 to the tip of the support shaft 14, insert the tip of the support shaft 14 into the mounting hole 16 of the fixing plate 15, compress the disc spring washer 17 with the fixing plate 15, and then attach the fixing plate 15 to the support shaft. 14 and engaging the pin 18 with the tip of the curved groove 20.

The fixed plate 15 includes a large number of friction rods 23 located on the outer periphery of the bobbin 12 and parallel to the axis of rotation of the bobbin 12 for winding the thread 22 unwound from the bobbin 12.
23. - and are arranged in a ring and are attached like a cantilever. Also, friction law, 123.23. A thread guide 24 for leading out the thread 22 unwound from the bobbin is provided on the fixed part on or near the fixed plate 15 on one end side of -. The thread 22 is led out through the opened thread lead-out guide 26.

Note that in the above embodiment, the friction rods 23, 23 . ... are installed in a cantilevered manner, but these friction rods may support both ends (or, by providing a large number of threes, 1, on the cylinder in parallel, What is necessary is to provide something substantially equivalent to a friction rod, such as using a friction rod between the slits.

In a yarn tension applying device having such a configuration, the system 22 unwound from the bobbin 12 rotatably supported by the support shaft 14 is routed around the outside of at least one friction abut 23 or is required. Depending on the tension, the thread kite 24 on the fixed plate 15 and The thread is led out through a thread lead-out guide 26 provided on the cover 25.

When the thread 22 is drawn out in this manner, even if the thread drawing position on the bobbin 12 moves in the axial direction of the bobbin 12, the friction rods 23, 23. The inclination of the thread 22 wound spirally around the bobbin 12 changes only slightly, but there is almost no change in the frictional force associated with it, so the thread 22 on the bobbin 12
Regardless of the position of drawer 2.

It becomes possible to lead out the thread 22 with constant tension.

The pulling tension of the thread 22 is the tension of the thread 2 drawn out from the bobbin 12.
By changing the number of friction rods 23 around which the friction rods 2 are wound, or by changing the manner in which the friction rods 23 are wound, adjustment can be made in multiple stages.

The above bobbin! As a device for weaving a three-dimensional cloth by applying motion to the bobbin carrier 11 supporting the bobbin 2 so as to travel along a required trajectory, the rovings unwound from a plurality of bobbins 12 are mutually organized. A device such as that illustrated in FIG. 4 and FIG. 4 can be used.

The three-dimensional cloth weaving device shown in FIG. 3 includes a bobbin drive device [32] in which a large number of drive units 33 are arranged on a frame 31 along a carrier orbital surface having a closed cylindrical or spherical surface. , pobin drive again? A mandrel 34 is attached to the center position of the mandrel 32 to form a cloth in a desired three-dimensional shape by attaching the roving unwound from the bobbin to the center position of the mandrel 34.
has been established. This mandrel 34 is replaceable depending on the shape of the three-dimensional cloth to be weaved, and in order to change its position as weaving progresses, an elevating mechanism 35 is used to raise and lower the mandrel relative to the frame 31. has been established.

Bobbin carrier! The drive unit 33 of the pobbin drive device 32, which provides the required motion, includes a drive source 37 such as a motor whose forward and reverse rotational drive can be controlled independently by a control device, and a rotor 38 rotationally driven by the drive source 37. ing.

As shown in FIG. 4, the rotors 38 are arranged in a plurality of rows in the movement area of the bobbin carrier 11, with many of them adjacent to each other.
By arranging them in multiple rows, they are installed two-dimensionally,
Each rotor 38 is provided with a recess 39 for sandwiching the pobbin carrier 11 between a pair of adjacent rotors. The concave portions 33 of these rotors are connected to a pair of adjacent rotors 38, 38.
when one side rotates.

The bobbin carrier 11 held between them is shaped so that it can be moved using the recess 39 of the other rotor as a guide. Therefore, the inner surface of the recess 38 is centered around the rotational axis of the adjacent rotor. It is formed into a cylindrical surface, or a rotating surface that is functionally equivalent.

On the other hand, the bobbin carrier +1 held between the rotors 38 has a holding part 41 formed of two cylindrical surfaces so as to fit into the space formed between the recesses 38 of a pair of adjacent rotors 38, It has a flange 42 projecting upward and downward, and the support shaft 14 for inserting the bobbin therein is erected, and as is clear from the above,
The holding portion 41 is fitted and held between the recesses 38 of the pair of rotors 38, and is movable in any direction by rotation of one of the rotors 38.

As the drive source 37 of the drive unit 33 mentioned above.

Although various types of drive devices controlled by the W control device can be used, it is suitable to use an intermittent drive mechanism using an internal sensor to intermittently rotate the rotor 38 in forward and reverse directions.

In the three-dimensional fabric M& machine equipped with the bobbin drive device configured as described above, the bobbin carrier 11 is supported between the adjacent multiple pairs of rotors 3B and 22, respectively, and one of the pair of rotors 38 and 38 supporting the bobbin carrier 11 is By one rotation, the bobbin carrier 11 is guided by the other rotor.
By repeating this process, a large number of bobbin carriers 11 are moved in two arbitrary axial directions, and as a result, the bobbin carriers 11 are made to travel a desired trajectory, and the bobbin supported by them is unwound. By weaving the rovings together, a three-dimensional cloth is woven.

[Effects of the Invention] According to the thread tension applying device of the present invention as detailed above, when drawing out the thread while applying tension to the thread wound around the bobbin, fluctuations in the drawing tension and damage to the thread may occur. It is possible to prevent this and stably apply the desired tension to the thread, and its compact structure allows it to apply the desired tension to the thread in a small amount of space, and the tension can be easily adjusted. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing the configuration of the thread tension applying device of the present invention;
Fig. 2 is an exploded perspective view of the same, Fig. 3 is a partially cutaway perspective view of a three-dimensional cloth weaving device in which the thread tension applying device is attached to a carrier of a bobbin drive device, and Fig. 4 is a portion showing the structure of the bobbin drive device. The perspective view and FIGS. 5A and 5B are explanatory views of the prior art. lO...Thread tension applying device, 12...Bobbin, 22ψ.
Thread, 23...Friction rod. 24 stitch thread guide. 1st a

Claims (1)

[Claims] 1. A large number of friction rods parallel to the axis of rotation of the bobbin for winding the thread unwound from the bobbin are arranged in a ring around the outer periphery of the bobbin which is rotatably supported, and one end of the friction rods is installed. A yarn tension applying device for a textile machine, characterized in that a yarn guide is provided for guiding the yarn.