JP2000336555A - Warp tension-detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a warp tension-detecting device capable of detecting the tension at a high accuracy by a simple structure. SOLUTION: This warp tension-detecting device has a beam-like detecting member 30 fixed to a prescribed position in a cantilever beam state, a strain gauge 31 installed in the beam-like detecting member 30, a swingable member 25 attached to the beam-like detecting member 30 so as to be freely swung, and a tension roll 36 held by the swingable member 2 and allowing a warp yarn 1 to be hung thereon. The line passing the fulcrum for the swing of the swingable member 25, and the attaching part of the tension roll 36 is formed so as to cross the extension direction of the beam-like detecting member 30. A tension deviation-regulating member 22 moving so as to absorb the deviation of the tension of the warp yarn 1 by the swing of the tension roll 36 is connected to the swingable member 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp tension detecting device for detecting a warp tension via a tension roll provided on a loom.

[0002]

2. Description of the Related Art Conventionally, a tension roll 3 as shown in FIG. 5 abuts on a warp 1 drawn from a warp beam and woven, in order to suppress a fluctuation in warp tension caused by a weaving operation. The tension roll 3 is attached via a shaft 5 to one end of a beam-type load cell 4 which is a cantilever-shaped load detecting member. The other end of the beam-type load cell 4 is fixed to an easing lever 6 that swings so as to reduce fluctuations in the tension of the warp 1. One end of the easing lever 6 is supported by a swing support shaft 7 fixed to a loom frame 8, and a rod 9 that swings the easing lever 6 is supported by the other end. The rod 9 is connected to the drive shaft of the loom, and reciprocates in the direction of suppressing the warp tension fluctuation caused by weaving, that is, in the direction of the arrow in the drawing, and actively moves to keep the warp tension constant.

The beam type load cell 4 is provided with a strain gauge (not shown) for measuring a strain generated when the tension roll 3 is pressed by the warp 1 and bends downward. A guide roll 2 provided in parallel with the tension roll 3 and around which the warp 1 is wound is provided near the tension roll 3, and the guide roll 2 is supported by a loom frame (not shown). .

In such a warp tension detecting device, first, the warp tension acts on the beam-type load cell 4 as a bending load, and the strain caused by the bending load is converted into the beam-type load cell 4.
Was measured with a strain gauge, and converted into an electric signal to detect the warp tension.

Further, as shown in FIG. 6, there has been an apparatus which operates using a coil spring 10 so as to passively absorb the fluctuation of the warp tension in accordance with the tension of the warp 1. This tension roll 3 is also attached via a shaft 5 fixed to one end of the beam type load cell 4. The other end of the beam type load cell 4 is fixed to the easing lever 6. The easing lever 6 is supported at one end by a swing support shaft 7 fixed to a loom frame 8,
One end of a coil spring 10 is rotatably supported by the other end, and the other end of the coil spring 10 is rotatably supported by a frame (not shown).

In the operation of this warp tension detecting device, the warp tension acts on the beam type load cell 4 as a bending load, and the easing lever 6 swings against the urging force of the coil spring 10 in the same manner as in the prior art. At the same time, the strain caused by the bending load was measured by a strain gauge and converted into an electric signal to detect the warp tension.

[0007]

In the prior art described above, since the beam-type load cell 4 itself is used as a moving body, the strain gauge of the strain gauge has an inertia force due to the mass of the beam-type load cell 4 itself in addition to the tension of the warp 1, and the like. The strain caused by a force other than the warp tension such as the oscillating inertia force of the tension roll 3 is also detected. Therefore, noise components other than the warp tension are added to the warp tension and detected, so that accurate detection of the warp tension cannot be performed.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a warp tension detecting device capable of performing highly accurate detection with a simple structure.

[0009]

A warp tension detecting device according to the present invention comprises a beam detecting member fixed at a predetermined position in a cantilever state, a strain gauge provided on the beam detecting member, and a beam gauge. A swing member is attached to the shape detecting member so as to swing freely, and a tension roll held by the swing member and around which a warp is wound. Further, a line passing through the swing fulcrum of the swing member and the mounting portion of the tension roll,
It is a warp tension detecting device provided so as to intersect with the extending direction of the beam detecting member.

[0010] Further, a tension fluctuation suppressing member that moves so as to absorb the fluctuation of the tension of the warp due to the swing of the tension roll is connected to the swing member. The swing range of the line passing through the swing fulcrum of the swing member and the attachment portion of the tension roll includes a line substantially perpendicular to the extending direction of the beam-shaped detection member.

In the warp tension detecting device of the present invention, a tension roll is attached to the beam-shaped detecting member via a swinging member, so that a component of the force applied to the beam-shaped detecting member due to the inertial force of the tension roll is provided. The size is reduced to minimize disturbance elements other than the warp tension.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention. A warp tension detecting device 20 of this embodiment is provided in a part of a loom (not shown), is connected to a drive shaft of the loom, and is connected to an arrow in the drawing. A pair of rods 22, which are tension fluctuation suppressing members that reciprocate in the direction of the arrow, are attached. The pair of rods 22 are provided in parallel with each other and substantially horizontally, and the distal ends of the rods 22 are respectively supported by the distal ends 24a and 25a of a pair of easing levers 24 and 25 as swing members.

Each of the easing levers 24 and 25 is integrally formed in a substantially rectangular shape, and mounting shafts 34 at both ends of a tension roll 36 are rotatably supported at bent corners thereof. A swing support shaft 28 fixed to a frame 26 of a loom is provided at a base end portion 24b of one of the easing levers 24 and 25, and the easing lever 24 is provided with a swing support shaft 28. Is mounted so as to be able to swing through.

The base end 25b of the other easing lever 25
Is provided with a swing support shaft 29. The swing support shaft 29 is supported by a beam type load cell 30 which is a cantilever-shaped detection member in the vicinity of a tip end thereof, and the easing lever 25 is supported by the swing support shaft 29. Is mounted so as to be able to swing through. Note that the base end 24b of the easing lever 24 is also the base end 25b.
The configuration may be the same as described above.

The other end of the beam type load cell 30 is fixed to a frame 32 of a loom. The beam-type load cell 30 detects a bending strain in a vertical direction by using a strain gauge 31 provided in the beam-type load cell 30. That is, the tension roll 36 is pushed by the warp yarn 1 and is lowered vertically in the warp direction.
It is measured as the tension of

In the vicinity of the tension roll 36,
In parallel with the tension roll 36, the guide roll 3
Numeral 8 is rotatably mounted around a shaft of a bearing fixed to a frame of a loom (not shown).

Next, the operation of the warp tension detecting device 20 will be described. First, the warp 1 drawn from a warp beam (not shown) comes into contact with the guide roll 38 to bend the path, and further comes into contact with the tension roll 36 so that the path is bent in a substantially horizontal direction and passes through a predetermined location. It is sent to the weft insertion process and woven. At this time, since the warp tension is changed in the warp 1 by the weaving operation, the rod 2
Numeral 2 reciprocates at a predetermined timing in a direction that cancels the warp tension fluctuation caused by weaving in synchronization with the weaving operation, that is, in the direction of the arrow in the figure. As a result, the tension roll 36 swings about the swing support shafts 28 and 29 so that the path length of the warp 1 increases and decreases, and the path length of the warp 1 decreases at the timing when the tension increases, as shown in FIG. The tension roll 36 swings clockwise to suppress an increase in tension. At the timing when the tension of the warp 1 decreases, the reverse operation is performed so that the tension of the warp 1 during the weaving operation becomes substantially constant.

The warp 1 is bent and wrapped around the tension roll 36 to have a component force in the direction of applying a bending load to the beam type load cell 30 due to the tension, and the deflection of the beam type load cell 36 due to the component force. Is detected by the strain gauge 31 and is detected as the tension of the warp 1. Here, the fluctuation of the tension of the warp 1 does not disappear even by the swinging operation of the tension roll 36, and the fluctuation of the tension of the warp 1 is detected as the fluctuation of the output of the strain gauge 31 provided in the beam type load cell 30. The tension detected by the strain gauge 31 is converted into an electric signal and output as a warp tension signal.

The operation and effect of the tension detecting operation of the beam type load cell 30 will be described with reference to FIG. The tension roll 36 is swung by the rod 22 using the swing support shafts 28 and 29 as swing support points A. For example, the tension roll 36 swings at a point where the tension roll 36 is located at a right angle below the extending direction of the beam type load cell 30. A case where the center B swings between the swing limits P and Q will be described. As for the inertial force of the tension roll 36, the inertial forces F1 and F2 when located at the swing limits P and Q are maximized. The inertial force F _{1 at the} swing limit P is divided into a component force f ₁ x in the extending direction of the beam type load cell 30 and a component force f ₁ y in a direction perpendicular thereto. Then, the component force f ₁ y acts as a bending load on the swing fulcrum A provided at the tip of the beam type load cell 30, and the strain caused by the component force f ₁ y causes It is detected by the strain gauge 31 and becomes a disturbance element when detecting the warp tension. On the other hand, the component force f ₁ x is a component parallel to the direction of extension of the beam-type load cell 30 with respect to the swing fulcrum A, does not act as a bending load on the beam-type load cell 30, and acts on the strain gauge 31. Is not detected as the tension of the warp yarn 1 and this component force f
_{1 x} is not a disturbance element of the warp tension detection.

[0020] Similarly when the tension roller 36 is located on the other of the swing limit Q also the maximum inertial force F ₂ acts on the tension roll 36. The inertia force F ₂ is also in the same manner as described above component force f _{2 x,} is divided into f 2 _y, the component force f _{2 y} is bending load to the pivoting movement fulcrum A which is provided at the distal end portion of the beam-type load cell 30 And this component force f
_{2 y} becomes a disturbance factor in the beam-type load cell 30 detects the warp tension. On the other hand, the component force f ₂ x in the extending direction of the beam type load cell 30 does not act on the swing fulcrum A as a bending load.

Accordingly, the component force f _{1 of the} inertial forces F ₁ and F ₂
It is preferable that y and f ₂ y be small, and this component force f ₁ y, f
_The condition for minimizing 2y is that the swing limit P or Q is located at a point B on the extension of the tension roll 36 in the direction perpendicular to the direction in which the beam type load cell 30 extends. Since P and Q cannot be located at this point B at the same time, the swing center B of the tension roll 36 is
This is a case where the beam type load cell 30 swings while being positioned at a right angle downward with respect to the extending direction. Also, this component force f ₁ y,
f ₂ y is maximum when the swing limit P or Q of the tension roll 36 is on the extension of the beam type load cell 30 in the extending direction. In this case, all of the inertial forces act as bending loads on the beam-type load cell 30. However, also in this case, since the swing limit P or Q is not on the extension of the beam type load cell 30 at the same time, the swing center B is on the extension of the beam type load cell 30 in the extension direction. It can be said that the disturbance factor due to the inertial force is maximized.

Therefore, the easing levers 24 and 25 holding the tension rolls 36 are provided with the above-mentioned component forces f ₁ y and f ₂ y.
In the case where the swing center B of the tension roll 36 is located at a right angle downward with respect to the extending direction of the beam type load cell 30 and swings, the viewpoint of eliminating disturbance factors. However, the position of the easing levers 24 and 25 is determined according to other conditions, and it is sufficient that at least the swing center B of the tension roll 36 does not extend in the extension direction of the beam type load cell 30.

According to the warp tension detecting device 20 of this embodiment, disturbance elements generated by the inertia force of the tension roll 36 and the like can be reduced as much as possible with a simple configuration, and the detection accuracy of the warp tension can be improved. .

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. Here, the same members as those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted. The warp tension detecting device 40 according to this embodiment includes a frame 4 having a surface substantially parallel to each end 24a of the easing lever 24.
6 is attached via a coil spring 48. Both ends of the coil spring 48 are easing levers 2
4 and the frame 46 are pivotally fixed to each other. The other end of the easing lever (not shown) abuts on the frame of the loom via the coil spring in the same manner as described above, and the swing fulcrum can swing on the frame of the loom as in the above embodiment. Is in contact with

Next, the operation of the warp tension detecting device 44 will be described. First, the warp 1 drawn from a warp beam (not shown) abuts on the guide roll 38 and further abuts on the tension roll 36 so that the path is bent in a substantially horizontal direction and is woven through a predetermined path. Here, the warp 1 causes a change in the warp tension due to weaving,
The tension roll 36 is pushed by the warp 1 and swings around the swing support shafts 28 and 29 in a direction to reduce the warp tension against the coil spring 48.

The beam type load cell 30 of this embodiment
Also, the fluctuation of the tension of the warp 1 during weaving is measured by the strain gauge 31, converted into an electric signal and output as the warp tension.

The warp tension detecting device 40 of this embodiment is also
By disposing the easing lever 24 in the same manner as in the above-described embodiment, a disturbance element due to the inertia force of the tension roll 36 can be eliminated as much as possible, and the tension fluctuation of the warp 1 can be accurately detected.

The warp tension detecting device of the present invention is not limited to the above embodiments, and the position of the tension roll can be appropriately set under the above conditions. Further, the tension roll and the guide roll may not rotate around the axis.

[0029]

According to the warp tension detecting device of the present invention, when the tension roll for guiding the warp is moved to make the tension of the warp substantially constant, the tension of the warp is not affected by the inertia force of the tension roll. Can be detected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a warp tension detecting device according to a first embodiment of the present invention.

FIG. 2 is a front view of the warp tension detecting device of this embodiment.

FIG. 3 is a schematic view showing the operation of the warp tension detecting device of the embodiment.

FIG. 4 is a front view of a warp tension detecting device according to a second embodiment of the present invention.

FIG. 5 is a front view of a conventional warp tension detecting device.

FIG. 6 is a front view of another conventional warp tension detecting device.

[Explanation of symbols]

 Reference Signs List 20 warp tension detector 22 rod 24, 25 easing lever 26, 32 frame 28, 29 swing support shaft 30 beam type load cell 31 strain gauge 36 tension roll 38 guide roll

Claims (3)

[Claims] A beam detecting member fixed in a cantilever state at a predetermined position; a strain gauge provided on the beam detecting member; and a swingably attached to the beam detecting member. A tension roll held by the swinging member and around which a warp is wound. A line passing through a swinging fulcrum of the swinging member and a mounting portion of the tension roll extends in a direction in which the beam-shaped detection member extends. A warp tension detecting device provided so as to intersect with the warp tension. 2. The warp according to claim 1, wherein a tension fluctuation suppressing member that moves so as to absorb fluctuation in the tension of the warp due to the swing of the tension roll is connected to the swing member. Tension detector. 3. A swing range of a line passing through a swing fulcrum of the swing member and a mounting portion of the tension roll includes a line in a direction substantially perpendicular to an extending direction of the beam detection member. The warp tension detecting device according to claim 1 or 2, wherein: