JPH0598540A - Warp tension detector in weaving machine - Google Patents

Abstract

PURPOSE:To obtain a warp tension detector capable of discovering true warp tension and excellently controlling warp feed. CONSTITUTION:In the middle of a course of warps T1 and T2 from a warp beam 1 to a weaving device 4, a tension lever 11B and an easing lever 12B are laid integrally and rockingly around a shaft 2a on a frame. A back roller 2 is rotatably attached to the shaft 2a and a tension roller 3 is rotatably fixed to the tip of the tension lever 11B. A side arm part 14B of the tension lever 11B is equipped with a pressure detector 15B and a tension detecting roll 16 and tension of the warps T1 and T2 is transmitted from the tension detecting roll 16 to the pressure detector 15.

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 in a loom that detects the tension of a warp fed from a warp beam and controls the rotation of the warp beam based on the detection result.

[0002]

2. Description of the Related Art In a warp delivery device disclosed in Japanese Patent Laid-Open No. 63-42941, a tension roller is provided which is displaceable in a contact / separation direction with respect to a warp from a warp beam to a weaving device. The roller is constantly in contact with the warp due to the load action of the balance weight. The tension roller is displaced based on the load received from the warp, and this displacement is transmitted to the shift lever of the transmission for driving the warp beam. The rotation speed of the warp beam is controlled in accordance with this displacement state, and the warp delivery amount is controlled so that the warp tension is always constant.
That is, the tension of the warp is detected as the position of the tension roller.

In Japanese Patent Application Laid-Open No. 1-264041, a detection lever is swingably provided on a machine base, a lower end portion thereof is connected to a load cell, and a tension lever is swingably provided at an upper end portion. There is. A tension roller is provided at the tip of the tension lever, and fluctuations in the warp tension are absorbed by the action of an easing spring installed between the rear end of the tension lever and the machine base. The warp tension is transmitted to the load cell via the tension roller, the tension lever and the detection lever, and the amount of warp delivery is controlled based on the electric signal output from the load cell according to the warp tension so that the warp tension is always constant. It

[0004]

In such a warp tension detecting structure, although the load applied to the bearing portion of the tension roller is regarded as the warp tension, the warp tension of the warp is absorbed by absorbing the fluctuation of the tension due to the opening movement and the beating. The inertial force of the tension roller that is displaced so as to keep the tension constant is also transmitted to the transmission (or load cell). Therefore, the actual warp tension and the gear ratio (or the output of the load cell) do not correspond to each other, and it is not possible to perform highly accurate warp delivery control. Further, when the warp tension is low, the influence of the friction between the tension roller and the bearing portion is relatively large, and the warp tension cannot be detected accurately.

It is an object of the present invention to provide a warp tension detecting device in a loom that can detect the true warp tension and control the warp discharge with high accuracy.

[0006]

In order to solve the above-mentioned problems, a warp tension detecting device of the present invention comprises a support member swingably provided on a machine base and a warp supported on the support member. The tension roller that guides the warp yarn while applying tension to it and the support member that is swung following the opening movement of the warp yarn to change the warp yarn path through the tension roller to absorb the warp yarn tension fluctuation. Warp tension holding means and warp tension detecting means provided on the support member for detecting the tension of the warp by contacting the warp passing through the tension roller.

[0007]

According to this structure, the tension roller and the warp tension detecting means integrally swing together with the support member in the same direction, and the warp tension detecting means directly detects the warp tension without the tension roller. Therefore, even if the tension roller swings, relative displacement due to the swing inertia force does not occur between the tension roller and the warp tension detecting means. Therefore, unlike the prior art, the warp tension detecting means can measure the true warp tension without detecting the apparently varied warp tension caused by the swinging inertial force of the tension roller.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIG.
2 and FIG. As shown in FIG. 1, a large number of warp yarns T1, T2 delivered from the warp beam 1 are guided to the weaving device 4 side via a back roller 2 and a tension roller 3. A large number of warp yarns T1, T2 are formed on the woven fabric W in the weaving device 4, and wound around the winding shaft 9 via the expansion bar 6, the surface roller 7 and the press roller 8.

As shown in FIG. 2, a hollow back roller 2
Is rotatably supported on the machine base via a shaft 2a penetrating therethrough. At both left and right ends of the back roller 2, the tension levers 11A and 1A are respectively provided on the shaft 2a.
1B is rotatably supported, and the easing levers 12A and 12B are rotatably supported together with the tension levers 11A and 11B. Both tension levers 11
A hollow tension roller 3 is provided between the tips of A and 11B.
Is rotatably supported.

Between the easing levers 12A, 12B and the machine base, easing springs 13A, 1 are respectively provided.
3B is hung. When the warp yarns T1 and T2 are opened and beaten, the tension levers 11A and 11B and the easing levers 12A and 12B swing about the shaft 2a in the direction in which the tension roller 3 moves toward and away from the weaving device 4. By the action of the easing springs 13A and 13B, the tension of the warp yarns T1 and T2 is always kept constant irrespective of the opening motion and the beating action of the warp yarns T1 and T2.

A support bar 10 is erected and supported between the side arm portions 14A and 14B of the tension levers 11A and 11B, and a pair of pressure detectors 1 is provided at both ends of the support bar 10.
5A and 15B are provided. Both pressure detectors 15A,
A tension detecting roll 16 is erected and supported on 15B. The tension detecting roll 16 contacts the warp yarns T1 and T2 between the back roller 2 and the tension roller 3 and transmits the tension of the warp yarns T1 and T2 to the pressure detectors 15A and 15B.

As shown in FIG. 1, the pressure detectors 15A, 1
5B is electrically connected to a comparator 19 via an amplifier 17 and a latch 18, and the comparator 19 further includes a tension setter 20.
Are electrically connected. The comparator 19 compares the tensions of the warp threads T1 and T2 input from the pressure detectors 15A and 15B with the tension set by the tension setter 20, and at the same time, outputs a correction signal corresponding to the tension difference to the A / D converter. It outputs to the adder 22 via 21.

The adder 22 adds the rotation drive signal from the servo motor 23 for driving the warp beam 1 and the correction signal from the comparator 19, and uses the added signal as a control signal via the amplifier 24 to serve as the servo motor 23. To feed back to. As a result, the rotation speed of the servo motor 23 is appropriately adjusted, and the feeding amount of the warp yarns T1, T2 and thus the tension are controlled.

According to this embodiment, the tension lever 11
The A, 11B, the easing levers 12A, 12B, the tension roller 3, the pressure detectors 15A, 15B, and the tension detection roll 16 are integrally swung. Therefore, even if the tension roller 3 swings, the relative displacement due to the swing inertia force does not occur between the tension roller 3 and the tension detection roll 16. Therefore, the pressure detectors 15A, 1 of this embodiment are
Unlike the conventional case, 5B can detect the true warp tension, without detecting the warp tension that apparently fluctuates due to the influence of the swinging inertia of the tension roller 3 due to the opening movement and the beating. Therefore, the warp delivery control using the servo motor 23 is performed with high accuracy, and the warp tension is kept satisfactorily constant.

In the conventional warp tension detecting structure, since it is necessary to receive the inertial load of the tension roller, durability against vibration and load is required, and a costly detecting device must be used. However, according to this embodiment, no load other than the warp tension is applied to the pressure detectors 15A and 15B, so that it is not necessary to use an expensive pressure detector. Further, since the detector can be used for a long period of time, it is excellent in economic efficiency.

According to this embodiment, the left and right tension levers 11A are formed by the shaft 2a penetrating the inside of the back roller 2.
Since 11B is connected, it is not necessary to provide a shaft, which is a heavy load, inside the tension roller 3. Therefore, the tension levers 11A, 11B and the easing levers 12A, 1
2B, tension roller 3, pressure detectors 15A, 15B
Also, the moment of inertia of the oscillating body composed of the tension detecting roll 16 is reduced, and the responsiveness of the oscillating body (and thus the responsiveness of the tension roller 3) is improved.

The present invention is not limited to the above embodiment, but may be carried out in the following modes. That is, (1) In the above embodiment, the tensions of the warp yarns T1 and T2 are detected on the path connecting the back roller 2 and the tension roller 3, but both the pressure detectors 15A and 15B and the tension detection roll 16 are detected. Is provided on the lower side of the side arm portions 14A and 14B, and the tensions of the warps T1 and T2 are detected on the path connecting the back roller 2 and the warp beam 1. (2) In the above embodiment, the tension of the warp yarns T1 and T2 is detected by the tension detecting roll 16, but the warp yarn T
Detecting only the tension of warp yarns in a specific range of the T1 group.

[0018]

As described above in detail, according to the present invention, the warp tension detecting means is provided on the supporting member for swingably supporting the tension roller, and the tension roller, the supporting member and the warp tension detecting means are integrally shaken. Since it is movable, even if the tension roller swings, relative displacement due to the swing inertia force does not occur between the tension roller and the warp tension detecting means, and the true warp tension is detected by the warp tension detecting means. It has an excellent effect that it can be done.

[Brief description of drawings]

FIG. 1 is a schematic view showing a warp tension detection and warp feeder according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of a warp tension detecting device.

[Explanation of symbols]

1 warp beam, 3 tension rollers, 11A, 1
1B A tension lever that constitutes a supporting member, 12A,
12B Easing lever constituting a supporting member, 13
A, 13B Easing spring constituting warp tension holding means, 14A, 14B Side arm constituting support member, 15A, 15B Pressure detector constituting warp tension detecting means, 16 Tension detecting roll constituting warp tension detecting means , T1, T2 warp.

Claims (1)

[Claims] 1. A warp tension detecting device in a loom that detects the tension of a warp sent out from a warp beam and controls the rotation of the warp beam based on the detection result. A support provided swingably on a machine stand. A member, a tension roller that is supported on the support member and applies tension to the warp threads, and a tension roller that guides the warp threads;
A warp tension holding means for changing the warp path passing through the tension roller to absorb fluctuations in the tension of the warp, and a warp tension detecting means provided on the support member and in contact with the warp passing through the tension roller. Warp tension detecting device for a loom, comprising: