JPH0210140Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to an electric feeding device for a loom, and more particularly to a device for detecting the tension of the warp threads.

Prior Art An electric feed-out device is equipped with a tension detector to adjust the warp tension. A normal tension detector detects the displacement of the tension roll system,
It is sent as an electrical on/off (digital) signal or a voltage (analog) signal to the control device.

When such tension control is performed using an on/off signal, the control form also becomes on/off control,
Modern control devices tend to use analog signals to prevent weaving from occurring in the fabric.
The detector is usually fixedly installed on the frame body, and converts the distance between the tension roll system detected object and the detector proportionally into an output voltage, which is used as a detection signal. .

On the other hand, if a tension roll system is combined with passive easing using a tension spring or a mechanically acting active easing mechanism, an error will occur between the displacement of the object to be detected and the warp tension, making it difficult to control accurately. It disappears. In addition, if a detector is placed at the fixed end of the tension spring, which is provided to balance the warp tension, the moment of inertia of the tension roll system is large, so false signals are likely to occur during high-speed rotation. It is difficult to control the tension stably because the resonance phenomenon is likely to occur.

Purpose of the invention Therefore, the purpose of the present invention is to directly detect warp tension, prevent malfunctions, and facilitate signal processing after detection, thereby achieving stable warp tension control. It is to do so.

Summary of the invention Therefore, the present invention was developed to rotatably support the tension roll at one end of the tension lever.
The bearing is supported in a loosely fitted state with respect to the tension lever, and the sensing end of the pressure sensor is connected without interposing an elastic body such as a spring between the sensing end of the pressure sensor and the bearing. It is made to come into direct contact with the above bearing. The pressure detector is arranged in the direction of the resultant force of the tension generated by the winding angle of the warp yarns on the tension rolls. Therefore, the warp tension, ie, the resultant force at the tension roll position, is in a state where it can directly act on the detection end of the pressure detector. Here, since the bearing is loosely fitted to the tension lever, it is slightly displaced in response to changes in the tension of the warp threads, and the amount of displacement is applied to the detection end of the pressure detector. Note that if the tension lever performs a rocking motion, that is, a positive easing action, in synchronization with the shedding motion of the loom, the tension fluctuation caused by the shedding motion can be removed from the detection signal of the pressure detector, so that the subsequent signal processing will be easier. It can be further simplified.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be specifically described below based on an embodiment shown in the drawings.

The tension detection device 1 of the present invention is provided on the sending-out side of the warp yarns 2. The warp threads 2 are wound around a delivery beam 3, pass through a guide roll 4 and a tension roll 5, become almost horizontal, and intersect with the weft threads 11 due to the shedding movement of the heald 6, forming the cloth 12. Then, it passes through the breast beam 7, the take-up roll 8, and the guide roll 9, and is then wound onto the take-up beam 10. In addition, the above-mentioned weft thread 1
1 is driven into the opening of the cloth 12 by the reeding action of the reed 13.

The tension roll 5 is supported by one end of the tension lever 14 at both ends. As shown in FIG. 2, this tension lever 14 is swingably supported by a key 16 with respect to the shaft 15 of the guide roll 4 in a non-rotating state, and has a pin 17, an easing rod 18 and Drive shaft 2 by crank pin 19
It is connected to a crank 21 which is fixed at zero.

Now, the shaft 22 of the tension roll 5 mentioned above is
The tension lever 14 is supported by a bearing 23 in a loose fit in a keyhole-shaped bearing hole 25 formed in the bearing portion 24 of the tension lever 14 . A pressure detector 26 is attached to the bottom of this bearing hole 25. The pressure detector 26 is formed of, for example, a strain gauge, and its detection end 27 is brought into direct contact with the outer periphery of the bearing 23.

action of invention Next, the operation of the tension detection device 1 will be explained.

Since the crank 21 rotates while the loom is rotating,
Tension lever 14 is given a swinging motion about axis 15 . Therefore, the tension roll 5 swings in synchronization with the shedding movement, and the warp yarns 2
The path length of the warp threads 2 is corrected to absorb the distortion of the warp threads 2.

When the necessary tension for weaving is applied to the warp threads 2,
The resultant force acts directly on the detection end 27 of the pressure detector 26 via the tension roll 5 and the bearing 23 that supports it. Here, the pressure detector 26 converts a very slight displacement of the bearing 23 loosely fitted into the bearing hole 25 into an electrical signal as compressive strain. Here, the bearing 23 is not particularly required to undergo a large displacement, and therefore the bearing 23 is restrained and supported in the bearing hole 25 with almost no gap. According to experiments, a diametrical gap of about 0.05 mm was sufficient when mating. In this way, an output voltage appears on the pressure detector 26 which is proportional to the resultant force produced by the tension in the warp threads 2.

Note that the warp yarns 2 are passed through guide rolls 4,
Since the warp yarns 2 are wound around the tension roll 5, even if the winding diameter of the sending beam 3 becomes small, the winding angle of the warp yarns 2 with respect to the tension roll 5 is as follows.
It is always constant and is not affected by changes in the winding diameter in the sending beam 3. Therefore, the detection signal of the pressure detector 26 is always proportional to the tension of the warp threads 2.

Modification of the invention The pressure detector 26 is connected to one tension lever 14
However, in so-called twin beam delivery, pressure detectors 26 are provided on the left and right tension levers 14. Moreover, this pressure detector 26 may be of a type that detects not a compressive load but a tensile load. Further, the bearing 23 is not limited to a ball bearing, and may be, for example, a sliding bearing or a spherical bearing. Further, in the above embodiment, the tension lever 14 is actively given a rocking motion, but this rocking motion is achieved by supporting the tension lever 14 so that it can swing freely, and using a tension spring at the other end. It may also be configured as a type that applies a rotational force in a predetermined direction, that is, as a passive easing type.

Effects of the invention In this invention, the bearing of the tension roll is in direct contact with the detection end of the pressure detector, and no elastic system such as a spring is involved in the process of transmitting the resultant force of the warp thread tension. It is possible to reliably obtain a control electrical signal that sufficiently follows the signal and does not include disturbances, so that no special signal processing is required after detection, and computer control becomes easy.
Further, in an embodiment in which the tension lever performs a positive easing action, fluctuations in tension caused by shedding motion of the loom can be absorbed, so that warp tension can be detected more accurately.

[Brief explanation of the drawing]

FIG. 1 is a skeleton diagram of a loom equipped with the tension detection device of the present invention, FIG. 2 is an enlarged side view of the tension detection device of the present invention, and FIG. 3 is an enlarged cross-sectional view of the main parts of the device. 1... Loom tension detection device, 2... Warp thread, 3
...Delivery beam, 4...Guide roll, 5...
...Tension roll, 6... Heald, 7... Breast beam, 8... Winding roll, 9... Guide roll, 10... Winding beam, 11... Weft, 12... Cloth, 13... O 14...Tension lever, 15...Shaft, 16...Key, 17...
... Pin, 18 ... Easing rod, 19 ... Crank pin, 20 ... Drive shaft, 21 ... Crank, 22 ... Shaft, 23 ... Bearing, 24 ... Bearing part, 25 ... Bearing hole, 26 ... pressure detector, 27
...Detection end.

Claims (1)

[Claims for Utility Model Registration] (1) A bearing for rotatably supporting the tension roll is supported in a loosely fitted state with respect to the tension lever, and a pressure sensor is provided at this loosely fitted position. 1. A tension detection device for a loom, characterized in that a pressure sensor is attached to the pressure sensor, and the detection end of the pressure sensor is brought into direct contact with the bearing. (2) The tension detection device for a loom according to claim 1, wherein the tension lever has a positive easing effect.