JPS6367575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a warp tension applying device in a warp delivery device of a loom.

Generally, when the warp yarns perform a shedding motion as shown in FIG. 1, warp strain occurs due to the difference in the path of the warp yarns, which usually causes tension fluctuations in the warp yarns. Moreover, the tension fluctuation of the warp yarn in this case is as shown in 1 in FIG. Therefore, the warp path difference between when the opening is closed and when the opening is fully open,
In order to move the tension roll backward during shedding and reduce tension fluctuations, an easing spring is installed at the tip of the tension rod to follow and correct warp tension distortion during shedding motion, or to correct warp distortion during beading. The parts are installed in the designated positions. When this easy spring is attached, the tension fluctuations are as shown by 2 in FIG. 2, and the tension of the warp threads when the sheath is closed is moderately high, so that the warp threads do not become loose when the sheath is closed. However, in this case, the high tension at full opening is not improved and warp breakage often occurs as a result, so it is necessary to lower the tension at full opening. However, if the tension of the easing spring is weakened for this purpose, the tension at the time of closing will also be lowered, as shown by 3 in Figure 2, which will cause the warp threads to slacken at the time of closure, resulting in poor opening of the warp threads. .

In addition, in the case of the former active easing device,
Since the tension roll is mechanically fixed, the response is very fast, but the easing amount is sensitive to the warp tension, making it very difficult to set.

Also, for example, a mechanism of the type shown in Japanese Utility Model Application Publication No. 49-98559 has an advantage in that the tension can be kept constant, but since it uses a spring, the response is poor. Furthermore, if a spring with a small spring constant is used in an attempt to reduce the tension difference with a constant strain, there is a drawback that the roll system vibrates at high speeds, making it impossible to correct the warp tension.

This invention was proposed in view of the shortcomings of the warp tension applying device in the conventional weaving machine's delivery device, and it prevents the occurrence of warp thread breakage when the weaving machine is fully opened, prevents yarn slack when the weaving machine is closed, and prevents the warp thread from becoming loose when the weaving machine is fully opened. This improves the handling and prevents opening defects from occurring.

In other words, the gist of the device of this invention is that by employing an easing spring, a moderately high tension is applied at the time of shedding, while the tension of the warp threads when fully opened is reduced as shown by 3 in Fig. 2. At the time of shedding, the tension roll is mechanically fixed and moved in a direction to relax the warp tension so that the warp tension is approximately the same, and at the same time, the easing spring is weakened.

As a device for applying such tension to the warp yarns, as shown in FIG. 3, an easing lever 1 is mounted at a predetermined position on a loom frame (not shown) so as to rotate about a point P as a fulcrum. Furthermore, the tension lever 3 is swingably attached to the easing lever 1 at a point Q located below the point P. Further, the tension roll 8 is rotatably attached to the tension lever 3 at a predetermined position. The other end of an easing rod 5 is connected to the lower end of the easing lever 1, and one end of the easing rod 5 is attached to a cam 4 that rotates once per revolution of the loom. Then, the upper end of the easing lever 1 and the predetermined position of the tension lever 3 (the upper left end in the figure)
An easing spring 6 is stretched between them. Easing spring 6 of tension lever 3
The mounting portion is pulled toward the easing lever 1 by the easing spring 6,
Therefore, the tension roll 8 is lifted upward using the point Q as a fulcrum. Therefore, a predetermined tension is applied to the warp yarns Y that are let out from a warp beam (not shown) and are in sliding contact with the tension roll 8.

Next, the operating state of the device of this invention will be explained.

When the cam 4, which rotates in synchronization with the rotation of the loom, rotates to the left, for example, and the mounting portion 40 of the easing rod to the cam 4 comes to position X, the easing rod 5 moves to the left in the figure. Then, the easing lever 1 is rotated about point P as a fulcrum, and its lower end is moved to the left and comes to position a. Then, as the loom rotates, the attachment part 4 of the easing rod to the cam 4
When 0 comes to position Z, the above easing lever 1
The lower end of is at position b. In this case, since the attachment point of the easing lever 1 to the frame, that is, the point P, is located above the attachment point Q of the tension lever 3, when the lower end of the easing lever 1 moves between positions a and b, the tension roll 8 also moves slightly to the left and right. Further, when the lower end of the easing lever 1 comes to position (a), its upper end comes to position c, and when the lower end of the easing lever 1 comes to position b, its upper end comes to position d. Then, the distance between both ends of the easing spring 6 changes according to the rotation of the loom, and as a result, the upper end of the easing lever 1 moves to the position d.
When the tension lever 3, which is pivotally supported by the easing lever 1, moves forward slightly, the tension roll 8, which is pivotally supported by it, also moves slightly forward, and at the same time, the distance between both ends of the easing spring 6 becomes smaller. . Further, when the upper end of the easing lever 1 is at position c, the tension roll 8 moves slightly rearward, and at the same time, the distance between both ends of the easing spring 6 increases.

In a mechanism that operates in this manner, the mounting portion 40 of the easing slot 5 to the cam 4 is set to position X when the opening is closed, and to position Z when the opening is fully opened. At the same time, the tension of the easing spring 6 is adjusted using a well-known method at the position where the opening is closed, and the warp tension is set to a value required when the opening is closed. Then, when the loom is closed, the upper end of the easing lever 1 comes to position c, the tension roll 8 moves to the rear of the loom, and the easing spring 6 is tensioned so that the warp tension becomes the value required when the loom is closed. becomes moderately high. In addition, at full shedding, the upper end of the easing lever 1 comes to position d, and the tension roll 8 moves forward of the loom in synchronization with the shedding movement, and at the same time, the distance between both ends of the easing spring 6 becomes small, resulting in warp tension. is smaller than when only the easing spring is used.

In this way, in the device shown in Fig. 3 above, when the warp threads are fully opened, the tension is lower than in the devices 1 and 2, as shown in Fig. 2 4; No, warp thread cutting does not occur. In addition, since the tension is higher than those in 1 and 3 when the opening is closed, there is no possibility that the warp threads will become slack when the opening is closed, which will cause subsequent opening defects.

Furthermore, according to the device of the present invention, since the tension difference between the warp threads is smaller than that of the conventional one, the shock applied to the warp threads when moving from the closed state to the fully opened state is small, and as a result, the warp threads are Once breakage occurs, it will never break.

Furthermore, since the warp path difference between when the opening is closed and when the opening is fully closed is reduced by actively moving the tension roll, the amount of roll movement that must be absorbed by the easing spring is reduced. Therefore, the vibration of the roll system can be prevented by increasing the spring constant of the spring, and since the rolls hold down the warp threads via the springs, the tension remains constant.

[Brief explanation of drawings]

FIG. 1 is a graph showing the shedding amount of warp threads, FIG. 2 is a graph showing fluctuations in warp tension, and FIG. 3 is an explanatory diagram showing a warp tension applying device in a delivery device of a loom according to the present invention. 1, 13... Easing lever, 3... Tension lever, 4... Cam, 5... Easing rod,
6... Easing spring, 8, 18... Tension roll, 9... Weight lever, 11... Joint rod, 17... Easing rod, Y
...warp, W...weight.

Claims (1)

[Scope of Claims] 1. An easing lever 1 pivotally supported at a predetermined position P of a loom frame; a tension lever pivotally supported at a predetermined position of the easing lever and supporting a tension roll 8 at one end; and the tension lever. a spring 6 interposed between the tension lever and the easing lever to rotate the tension lever in a direction in which the warp is tensioned; a predetermined mechanism that moves and swings the easing lever, and a predetermined position at which the easing lever pivotally supports the tension lever causes the tension roll to move in the warp loosening direction when the warp is being opened, compared to when the warp is being opened. set in position. A warp tension applying device in a delivery device of a loom, characterized in that: