JPS6233850A - Wefting apparatus of loom using moving magnetic field - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention relates to a weft insertion device for a loom that uses a moving magnetic field, and more specifically, to a weft insertion device for a loom that uses a moving magnetic field (linear motor) to insert flying objects such as grippers or shuttlecocks. This invention relates to a weft insertion device that performs weft insertion by flying the weft.

(Prior art) Recently, there has been a method of carrying out Korean insertion by flying a flying object such as a gripper or a shuttlecock. & High-speed detour i+ on aircraft
(From the standpoint of improving efficiency and reducing noise during operation, we use a near motor type as shown in Figure 2, that is, we provide a moving magnetic field A continuously in the weft insertion direction within the sled 1 or in a part of the sled. Many looms have been proposed in which weft insertion is carried out by flying a gripper 70 or shuttlecock made of a light metal material, for example, over the weft.

(Problems to be Solved by the Invention) -It is well known that in order to perform high-speed weft insertion using a moving magnetic field, it is necessary to strongly excite the magnetic field and increase the frequency.

However, when the magnetic field is strongly excited, heat generation increases in the transverse magnetic field portion, which not only shortens the life of the coil but is also unfavorable from the standpoint of energy saving.

By the way, in a conventional linear motor-type weft insertion device in which a moving magnetic field is provided continuously over the entire weft insertion direction of the sled or in a part of the sled, the excitation of the moving magnetic field is partially controlled. Therefore, the only option was to apply uniform excitation in the entire extending direction. Therefore, if the magnetic field is constantly excited, the loss of electrical energy is extremely large, and if the coil is damaged due to long-term heat generation, the entire coil must be replaced, which reduces maintenance costs. I didn't like it.

However, it is not necessary to uniformly excite the weft as a whole; for example, if the areas near both ends are excited at a lower frequency than the area near the center, it is possible to apply appropriate tension to the weft yarn.

(Means for Solving the Problems) This invention was proposed to solve the conventional drawbacks as described in L, and its basic structure is as follows:
As shown in the figure, the moving magnetic fields A1 to A5 are divided into a plurality of fields in the direction of the gripper flying force so that only the necessary portion, that is, the portion where the gripper is currently traveling, can be excited in response to the running movement of the gripper. be.

In the following description, a gripper is used, but this is for convenience, and it goes without saying that a shuttle-type gripper may also be used.

(Example) The present invention will be explained in detail below.

As shown in FIG. 1, a moving magnetic field A is divided into a plurality of parts and provided in the sleigh (not shown) in the flying direction of the gripper 70. As shown in FIG. Each of these moving magnetic fields A1-A5 is connected to a corresponding inverter B1-B5, respectively. These inverters B and -B5 are connected to a weft insertion timing controller 5 and a frequency controller 7, respectively, and the weft insertion timing controller 5 is connected to an encoder 15 and a timing setter 16 attached to the crankshaft of the loom (not shown). The zero frequency controller 7 connected to the loom is connected to a frequency setter 27 and a tachogenerator 17 installed as a rotation detector of the loom, and can set the moving speed and frequency of the moving magnetic field according to the weft insertion pattern. At the same time, a command signal is issued according to the rotation speed of machine a.

The frequency of the magnetic field AI''A5 is, as shown in Figure 3,
The moving magnetic field A1 located on the yarn feeding side is set to a low frequency in order to accelerate the gripper 70, the frequency is set higher as it goes to the moving magnetic field A3 at the center of the slay, and the moving magnetic field A5 from the center to the anti-yarn feeding side In order to decelerate the flying gripper 70, the frequency is set to gradually become weaker.

The length dimension of each of the divided moving magnetic fields in the weft insertion direction is set to a high frequency, and if the central moving magnetic field A3 is set longer than the moving magnetic fields AI and A5 at both ends, the gripper 70 can run at high speed. This improves weaving efficiency.

Note that if the gripper 70 or the shuttlecock is made of a conductive material, slippage will occur, so in order to prevent this from happening, the gripper 70 or the shuttlecock may be made of a magnet.

(Operation of the Invention) When a signal from the encoder 15 and a signal indicating the angle set by the timing setter 16 are input to the weft insertion timing controller, the signals are processed as shown in FIG. 3 through the inverters B1 to B5. Current is sequentially applied to each of the moving magnetic fields A1 to A5 at set timings. Then, the excitation of the moving magnetic field in the part through which the gripper has passed is released.

On the other hand, the frequency controller 7 receives the signal output from the tachogenerator 17 and the signal indicating the frequency set by the frequency setter 27, and controls the frequency controller 7 to set the moving speed of each of the moving magnetic fields A1 to A5 in accordance with the weft insertion pattern. A command signal is output to each corresponding inverter B1 to B5. The frequency controller 7 corrects the set frequency in proportion to the number of rotations of the loom based on a signal from the tachogenerator 17. Therefore, stable weft insertion can be performed. Then, the gripper 70 grips the weft W from the yarn supplying body 80 and moves according to the movement of the moving magnetic fields A1 to A5. However, it goes without saying that this weft insertion timing is synchronized with the warp shedding and is performed while the warp shedding is being performed.

In the example described above, the set frequency is corrected in proportion to the loom rotation speed, but if the fluctuation in the rotation speed during stable operation is negligible, the frequency for steady pressure diversion can be set. In addition, the frequencies used for the transient state of loom startup are also set, and these are switched at a predetermined timing, either when the tachogenerator signal reaches an almost steady rotation speed, or after a predetermined period of time has elapsed after startup. Good too.

(Effect of the invention) According to this invention, the moving magnetic field is divided into a plurality of groups;
．． Since the moving magnetic field in the part corresponding to the flying position of the gripper, that is, only the moving magnetic field in the part that requires excitation, is excited, unlike conventional systems, there is no need to constantly flow a high current through the entire moving magnetic field. This is preferable from the viewpoint of power saving.

Furthermore, since the frequency of each moving magnetic field can be changed appropriately, the frequency of the moving magnetic field at both ends can be set low, and the frequency of the moving magnetic field at the center can be set high. The flying speed of the weft yarn is increased, greatly improving weaving efficiency, and appropriate tension can be applied to the weft yarn during weft insertion, thereby improving the quality of the fabric.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a weft inserting device for a loom according to the present invention. Figure 2: An explanatory diagram showing a device applying the principle of the linear motor type weft insertion method. FIG. 3: A graph showing an example of the frequency timing and level applied to each moving magnetic field of the present invention. ■... Slay 5... Weft insertion timing controller 7... Frequency controller 15... Encoder 16
...Timing setter 17...Tachogenerator 27.
...Frequency setter 70...Gripper 80...
Yarn feeder 90... Yarn guide W... Weft A, A+~A5... Moving magnetic field B1-85...
・Inverter patent applicant t1! Takoma Kogyo Co., Ltd. Patent Application Agent Patent Attorney Kan Atsushi - Department Figure 1

Claims (1)

[Claims] [1] A type of weft insertion in which a moving magnetic field is formed extending in the weft insertion direction, and weft insertion is performed by flying a flying object over the moving magnetic field, wherein the moving magnetic field extends in the weft insertion direction. 1. A weft insertion device for a loom using a moving magnetic field, characterized in that the weft insertion device is divided into a plurality of parts and has a control device that excites each moving magnetic field only at a preset timing. [2] Using the moving magnetic field according to claim 1, wherein the frequency of exciting each of the moving magnetic fields is individually set according to the weft insertion pattern. A weft insertion device for a loom. [3] The frequency of excitation in each of the moving magnetic fields is set to increase from those located at both ends toward the center. ]
A weft inserting device for a loom using a moving magnetic field as described in 2. [4] Claims [1] and [2] characterized in that among the plurality of divided moving magnetic fields, the one located in the center has a longer division length than the other parts. ] or a weft insertion device for a loom using a moving magnetic field according to item [3].