JPH04228663A - First twisting for knotless net - Google Patents

Abstract

PURPOSE:To provide a new twisting method capable of wholly and uniformly adding the first twisting operation to yarns and of freely and readily adjusting the first twisting operation in an extremely suitable state. CONSTITUTION:In a twisting method in which spindles transferred on a revolution orbit are rotated with a twisting device to twist yarns, the twisting operation and stoppage of the twisting device are carried out under constant timings and intervals.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method for twisting and twisting a knotless net.

0002

[Prior Art] In knotless knitted nets, so-called pre-twisting, which twists the threads (strands) that make up the net legs, is
This is done by rotating a weight that moves along a predetermined orbit using a pre-twisting device. As shown in Japanese Patent No. 120020, for example, this pre-twisting device has two push plates, an upper and a lower one, on the side of the revolution orbit of a weight (bobbin), and a friction plate below the weight is pressed by the two push plates. There are those in which the weight is pressed between plates to make it rotate and twist the thread, or recently, there are those in which the weight is rotated using a circular gear and an arcuate rack as described in Japanese Patent Application Laid-Open No. 60-209059. be.

Most of these conventional twisting devices, such as the device 40 shown in FIG. Either the twisting operating state (ON) or the resting state (OFF) is selectively used by rotating a switching pin 49 having a twisting state. Therefore, in this type of conventional device, the adjustment of the first twist is determined by what percentage of the total twisting device is operated. For example, if the twisting ring (single circle) with the lower twisting device in the weight distribution diagram shown in FIG. 8 is operated by switching every other pin as shown in the figure, the twisting rate will be 50%. In addition, double circles in the same figure represent assembled rings.

[0004] By the way, the weight rotates only on the same twisting ring in the leg portion of the net, and a knitted net is created by moving sequentially through the twisting ring, the braiding ring, the twisting ring, and so on. Therefore, as shown in FIG. 9, when the length L of the thread inside the weight B is large, the length m of the net leg (also called mesh) is large, that is, in a net with a short mesh. Since m<L, the twist of the yarn in the weight B can be made uniform on average in the process of passing through a plurality of twisting rings.

On the other hand, in the case of a mesh with a large mesh, m is close to L or m>L, so the mesh is divided between the twisting wheels in which the twisting device is operating and the twisting wheels in which the twisting device is not operating. The balance of the first twist in the leg portion will be greatly disrupted. (This is because, as mentioned above, the weight does not shift in the leg part.)

As mentioned above, with conventional spring-type twisting devices, the device is either activated or fixed in a resting state by switching, so adjustment of the first twist is difficult. The only choice was to determine the number of twisting devices to operate.

However, such adjustment of the first twist may upset the balance of the first twist in the entire net, and especially when knitting a long mesh net as described above, the twisting device is The balance of ply twisting at the net leg portions would be greatly disrupted between the twisting wheels with and without the twisting wheel operating, resulting in differences in the strength of the net leg portions, uneven dyeing, etc., resulting in defective products.

[0008]

[Problems to be Solved by the Invention] However, this invention solves these problems at once, allows uniform first twist to be applied evenly throughout the entire body, and allows extremely appropriate first twist adjustment to be made freely. The purpose of this invention is to provide a new twisting method that can be used in the future. Another object of the present invention is to provide a first twisting device that can be freely and easily controlled.

[0009]

[Means for solving the problem] That is, this invention
The yarn is twisted by rotating a weight moving in a revolving orbit by a twisting device, characterized in that the twisting operation and stopping of the twisting device are performed at fixed timings and intervals. This relates to a method of twisting and twisting a knotless net.

0010

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a top view showing an embodiment of a twisting device embodying the invention, and Fig. 2 shows its operating state and rest state. 3 is a front view showing a state in which the lower press plate is lowered and the friction plate is released; FIG. 4 is an operation explanatory diagram showing an embodiment of the method of the present invention; FIG. FIG. 6, which is an explanatory diagram of the operation of the embodiment, is a graph obtained by examining the lower twist ratio for the entire net.

The twisting device 10 shown in FIGS. 1 to 3 is installed on the side of the orbit 31 of a weight 30, and pinches a friction plate 32 below the weight to rotate the weight 30 and twist the thread. This relates to a device that applies twist to the fibers. Reference numeral 33 in the figure represents the rotation axis of the weight, and 35 represents a weight wheel that causes the weight to revolve.

As can be understood from the drawings, the twisting device 10 includes two approximately arcuate upper and lower press plates for pinching the friction plate 32 of the weight, that is, an upper press plate 11 and a lower press plate. 12
have. Between these push plates 11 and 12, there is a twist guide 1 that regulates the interval between both push plates and guides the friction plate 32 of the weight.
3 is usually provided. These upper pressing plates 11 and lower pressing plates 12
The twist guide 13 is supported by two pillars 15, 15 erected on the base 14.

An operating plate 25 is provided at the lower part of the lower press plate 12 and is moved up and down by an air cylinder 20, and by switching the cylinder 20, the lower press plate 12 is moved up and down, thereby increasing the friction plate of the weight. 32 is configured to switch between clamping and releasing. Reference numeral 21 is the actuating rod of the cylinder.

This air cylinder 20 can be operated by opening and closing a solenoid valve 29 of an operating section 27 shown in FIG. Reference numeral 28 is an air conduit. In the illustrated embodiment, one cylinder can switch between two weights, but this is a space and design issue, so even if it is a one-to-one stand-alone system, Needless to say, it's a good thing.

In the present invention, the above-described air cylinder type twisting device 10 is used, and the twisting device is activated and deactivated repeatedly at fixed timings and intervals. That is, by electrically controlling the solenoid valve 29 of the air cylinder, the twisting device for all twisting wheels is controlled to operate at a fixed timing and at a fixed interval.

[0016] In this case, it is convenient to set the interval as a ratio to the number of twists in the leg portion. For example, if there are 50 twisted threads on each leg, by turning on the solenoid valve and activating the twisting device for 20 out of the 50 threads, the twisting threads will be equal to 40 threads on each leg.
% twist rate can be obtained. In the conventional method, in order to obtain a twisting rate of 40%, 40% of all twisting devices must be in operation, but only 6 twisting wheels with the twisting devices inactive.
As already mentioned, this means that the first twist is not evenly applied to all the legs.

Furthermore, when twisting by a twisting device is carried out at fixed timing and intervals, the twist piles of the net legs to be twisted are divided into a plurality of cycles of constant twist piles, and a predetermined twist pile of each cycle is Twisting for only a few minutes has a great advantage in making the ply twist on each leg more uniform.

That is, as shown in FIG. 4, the 50 twisted strands of the leg are divided into 5 equal parts to make 10 strands per cycle, and the solenoid valve is actuated for only 4 of these 10 strands, and the other 6 strands are activated. Let the mountain rest and repeat this five times. The strength of the first twist when using this method can be easily adjusted by increasing or decreasing the operating interval. For example, in the above example, if you want to make the first twist stronger, you can change the operating interval of the solenoid valve from 4 threads to 5 threads to 6 threads.

In addition, the control of the solenoid valve of the air cylinder that switches the twisting device between operation and rest is digitally controlled by inputting rotation pulses from the knitting machine and timing based on this. The interval can be easily changed by a digital switch. For example, in the previous example, first, the timing for starting twisting is set by counting from the reset signal during the knitting process. If the number of twists in one cycle is set to 10, the number of repetitions (cycle number) is set to 5, and the twisting operation interval is set to 4, it is possible to easily and easily obtain the first twist with uniform strength in each leg.

Furthermore, when the twisting devices are operated, a large load is placed on the knitting machine, and if all the twisting devices are operated at the same timing, the load on the machine will fluctuate to an extreme degree, which is unfavorable in terms of machine operation and maintenance. Therefore, in order to avoid this, as shown in Fig. 5, the entire twisting device is divided into multiple appropriate systems (four systems in the example), and the operating timing of each system is slightly shifted for each system. load fluctuations can be equalized.

[0021]

Effects of the Invention FIG. 6 shows the pre-twist ratio (
This is a graph comparing the ratio of first twist to first twist. As shown in the graph, it can be seen that according to the method of the present invention, proper first twist is uniformly applied in most places on the net legs. The reason why two peaks, one strong and one weak, appear in the graph of the conventional method is because there is a difference between the locations where the twisting device is operating and the locations where it is at rest. As described above, according to this invention, the unbalance of the first twist in the conventional method can be solved at once, and a uniform first twist can be applied evenly throughout the product, making it possible to freely adjust the first twist in an extremely appropriate manner. becomes.

[0022] Furthermore, the device in which the lower press plate is moved up and down by a cylinder to compress or release the friction plate of the weight can be easily controlled electrically as explained in the embodiment, and furthermore, It has great advantages in terms of operation and control, such as the ability to adjust the first twist with a single touch using a digital switch. In addition, since the air pressure that operates the cylinders is applied equally to all twisting devices, it is possible to avoid variations in the pressure applied to each friction plate as in the conventional spring type, and the pressure can be easily controlled. This makes it easy to change the setup when changing the weight.

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of a twisting device for implementing the method of the present invention.

FIG. 2 is a central sectional view illustrating the operating state and rest state from left to right.

FIG. 3 is a front view showing a state in which the lower pressing part is lowered and the friction plate is released.

FIG. 4 is an operation explanatory diagram showing an embodiment of the method of the present invention.

FIG. 5 is an operation explanatory diagram showing another embodiment.

FIG. 6 is a graph showing the initial twist ratio of the entire net.

FIG. 7 is a front view showing an example of a conventional twisting device.

FIG. 8 is a weight distribution diagram showing a conventional twisting state.

FIG. 9 is an explanatory diagram showing the relationship between the length of the net leg and the length of the weight distribution part.

[Explanation of symbols]

10　Pre-twisting device 11 Upper press plate 12 Lower push plate 13 Twisting guide 15 Post 20 Air cylinder 25 Actuation plate 29 Solenoid valve 30 weight 32 Friction plate

Claims (1)

[Claims] Claim 1: A weight moving on a revolving orbit is rotated by a twisting device to twist the yarn, and the twisting device is configured to start and stop the twisting at regular timings and intervals. A method for first twisting a knotless net.