JPH0361787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a net making machine for knitting net fabrics such as fishing nets, and particularly to a tightening device for a tightening roll engaged in tightening the mesh.

(Prior Art) In general, this sorting roll is not constructed to be tensioned in the direction in which it is swung down, but is designed to fall under its own weight and reach the bottom dead center. Then, when it reaches the bottom dead center, the tightening roll acts to jump up due to the reaction of falling, and as the warp threads loosen, vibrations are generated. Although there are various types of vibration prevention devices, no measures are taken against momentary loosening of the warp threads.

Even if the warp threads loosen momentarily, there is almost no problem when the yarn used for knitting is monofilament, but when it is multifilament twisted yarn, momentary loosening can be a huge problem. become. That is, the multifilament twisted yarn has a property that when the tension is relaxed, a twisting phenomenon occurs due to residual torque, and the yarn becomes kink-like.

Therefore, when a large number of warp threads are arranged side by side with a small gap between them, if the warp threads become slack even momentarily due to the jumping up of the tightening roll, the threads may become twisted into knots and easily break. Alternatively, due to twisting, adjacent threads become entangled with each other, resulting in uneven thread unwinding, and uneven stitching due to uneven stitching.

(Object of the Invention) The present invention has been made to eliminate the drawbacks of the conventional technology, and its purpose is to prevent the tightening roll from jumping up, and even when using multifilament twisted yarn, twisting due to residual torque occurs. will no longer occur,
The purpose of the present invention is to provide a tensioning device for a tightening roll that produces a stable knitted net.

(Structure of the Invention) The present invention has been made to achieve the above object,
A chain drum is attached to the eye tightening shaft to which the eye tightening roll is attached, one end of the chain is attached by winding around the periphery of the chain drum, and the other end of the chain is constantly rotated in the direction of swinging down the eye tightening roll. A tensioning device for an eye tightening roll, characterized in that the eye tightening roll tension device is connected to a biasing means that biases the eye tightening roll and continues to maintain tension so that the eye tightening roll does not jump up due to reaction when the eye tightening roll reaches the bottom dead center. The roll is always biased in the direction in which it is swung down, and the swung-down tightening roll is suppressed from jumping up at the bottom dead center.If used in conjunction with an appropriate vibration prevention device, multifilament twisted yarn can be used. However, the warp threads are free from slackness, which eliminates twisting due to residual torque, resulting in a fast and stable knitted network.

(Example) Next, the tightening roll tensioning device in the net making machine of the present invention will be explained in more detail with reference to the illustrated embodiment. First, in order to understand the net making machine, a schematic diagram is shown in Fig. 1. . In this figure, warp yarn 1 and weft yarn 2 are supplied from separate systems, warp yarn 1 is supplied to the knitting network position via warp yarn supply roll device 3 and stitching device 4, and weft yarn 2 is supplied from different systems. The knitting net is supplied from the shuttle 5 to the knitting net position. At the knitting position, the supplied warp and weft yarns are knitted by the upper hook 6 and the lower hook 7, and the knitted net fabric 8 is knitted in a predetermined manner every time a row of knots is formed by the feed roll device 9. is transferred by the length of
The position at which the next row of knots will be formed is determined, and the stitching and transfer of the net fabric to the winding position are performed in sequence. The knot tightening is performed by tensioning the warp threads 1 using a tightening device 4 equipped with a tightening roll that is swung down a predetermined stroke.

In the net making machine having such a configuration, the tightening device 4
The parts shown in FIG. 2 are emphasized. In this figure, 11 is a main shaft, and 12 is a tightening shaft. An eye tightening roll 14 is attached to the eye tightening shaft 12 via a pair of arms 13 so as to be substantially parallel to the eye tightening shaft.

In this eye tightening device, a chain drum 15 is fixed to an eye tightening shaft 12, one end of a chain 16 is fixed by winding it around the periphery of the chain drum, and the other end of the chain is attached to a biasing means 17 such as a coil spring.
It is connected to. In this case, since the tension biasing means is a coil spring, it has a predetermined length and it is necessary to change the direction of the tension. be. The biasing means 17 has its end fixed to the frame of the net making machine via a turnbuckle 19. Note that the biasing means is not limited to a coil spring; for example, a winding drum having a built-in spring and biased to rotate in one direction may also be used. The point is that any device that pulls the chain drum in one direction and always keeps it in a biased state will suffice.

(Function) The tightening roll tensioning device according to the present invention configured as described above, when the tightening roll 14 is swung down, intertwines the warp 1 and the weft 2 with the upper hook 6,
When the warp yarn 1 is pulled out by the lower hook 7 and passed through the shuttle 5, the warp yarn 1 is removed from the lower hook 7, and at the same time the tightening roll 14 is pulled out by its own weight and the biasing means 17
It falls or is swung down by the pull of the object.

The lifting and falling strokes of the eye tightening roll 14 approximately correspond to the strokes in which the warp threads are pulled out by the lower hook 7. When the eye tightening roll 14 is pulled out with the lower hook 7, the eye tightening roll 14 is lifted upward, and the lower hook pulls out the warp threads. When the thread is released, it is swung down to pull back the length of warp thread that was pulled out.

In this rolling down, generally the eye tightening roll 1
4 reaches the bottom dead center, it is pulled upward due to the reaction of swinging down, but it is urged in the direction of swinging down by the biasing means 17, and the bottom dead center is pulled up against the reaction. Attracting to the point. Particularly when using multifilament twisted yarn, if you pull out the warp yarn with the lower hook 7 and let go of the warp yarn when passing it through the shuttle 5, the warp yarn will loosen even for a moment, and the residual torque of the twisted yarn will cause it to twist. However, the tightening roll 14 is always urged by the urging means 17 in the direction in which it is swung down via the chain 16 and chain drum 15, and because it is forcibly swung down by this urging, Compared to the natural fall due to the tightening roll's own weight, it is swung down more quickly and leaves no room for twisting.

(Effects of the Invention) As explained above, in the eye tightening roll tensioning device according to the present invention, a chain drum is attached to the eye tightening shaft to which the eye tightening roll is attached, and the chain drum is wound around the periphery of the chain drum. One end is attached, and the other end of the chain is always biased to rotate in the direction of swinging down the eye tightening roll, and is kept under tension so that the eye tightening roll does not jump up due to reaction when it reaches the bottom dead center. By configuring the means in a connected manner,
Since the tightening roll is always biased in the direction in which it is swung down, there is no slack in the warp even when the warp is pulled out with the lower hook and released through the shuttle, and even when the tightening roll is swung down. By eliminating the bounce-up phenomenon caused by the reaction, there is no slack in the warp yarns, and even when using multifilament twisted yarns that retain residual torque, kink due to twisting occurs.
There is no occurrence of threads or entanglement of adjacent threads, and the excellent effect is that a fast knitting net can be made, and accidents such as thread breakage due to the formation of knots in the knitting net are completely eliminated.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a net making machine to which the tensioning device of the present invention can be applied, FIG. 2 is a side view schematically showing the tightening device for tightening rolls according to the present invention, and FIG. FIG. 2 is an enlarged perspective view showing only the main parts of the device. 11... main shaft, 12... eye tightening shaft, 13... arm, 14... eye tightening roll, 15... chain drum, 16... chain, 17... biasing means, 18
...Chain sprocket, 19...Turnbuckle.

Claims (1)

[Claims] 1 A chain drum is attached to the eye tightening shaft to which the eye tightening roll is attached, one end of the chain is attached by winding around the periphery of the chain drum, and the other end of the chain constantly rotates in the direction of swinging down the eye tightening roll. What is claimed is: 1. A tightening device for a tightening roll, characterized in that the tensioning device is connected to a biasing means that urges the tightening roll and continues to maintain tension so that the tightening roll does not jump up due to reaction when it reaches the bottom dead center.