JPS63112752A - Weft yarn insert shuttle guide apparatus in loom - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a weft insertion guide device for a weft insertion shuttle.

(Prior art) A shuttle that grips a weft yarn supplied from the outside is ejected into the warp opening by appropriate means such as mechanical impact or electromagnetic acceleration. A weft insertion guide device is generally employed in which a large number of shuttle guide members that can pass through a group of warp threads and enter the warp shedding are arranged in order to control the warp threads, and a guide path for the shuttle is formed by the rows of these shuttle guide members. . An example of such a weft insertion guide device is disclosed in BP724914, US Pat.
It is disclosed in P3902535 and JP-A-59-71461.

In BP724914, the shuttle completely enters the guide hole of the shuttle guide member and is guided, and the weft gripped by the shuttle is pulled through the guide hole, and during beating, the shuttle thread is guided through the guide hole. He escapes and gets whipped by Orimae.

In US Pat. No. 3,902,535, a shuttle having an arcuate cross section is guided astride a disk-shaped shuttle guide member, and the weft yarn is guided outside the circumference of the shuttle guide member.

In Japanese Patent Application Laid-open No. 59-71461, a coil is wound around the buried base end of each shuttle guide member arranged in parallel on the sleigh.
The flight of the shuttle is assisted by exciting each coil like a relay in accordance with the flight timing of the shuttle.

(Problems to be Solved by the Invention) The weft insertion guide device disclosed in BP7249'14 makes contact with the guide member of the shuttle in order to smooth the contact between the guide member that guides the shuttle and the flying shuttle. It is often necessary to spray the area with oil, but this necessarily results in a deflection of the guide member to the area where it comes into contact with the shuttle. Therefore, in the shuttle weft insertion guide device disclosed in BP724914, oil adheres to the peripheral wall of the guide hole of the guide member, and it is inevitable that the weft thread threaded through the guide hole becomes oily, that is, the quality of the woven fabric is deteriorated. USP39025
In the shuttle weft inserting guide device of Publication No. 35, an attempt has been made to blow high pressure air around the periphery of the guide member to avoid contact between the shuttle and the guide, but this is impractical due to the huge consumption of air.

Moreover, when the shuttle is guided by contact with the shuttle guide member, there is an inconvenience that in order to reduce the contact, it is necessary to lengthen the period during which the sley is stationary during the shuttle guide.

In contrast to the shuttle weft insertion guide device that has such problems, the shuttle weft insertion guide device disclosed in Japanese Patent Application Laid-Open No. 59-71461 flies the shuttle through a magnetic flux region within the guide hole generated by the excitation of the coil. , a force acts on the shuttle in the direction of separating it from the peripheral wall of the guide hole.

Therefore, it is possible to avoid contact between the shuttle and the circumferential wall of the guide hole, the need for spraying oil on the shuttle is reduced, and it is also possible to shorten the resting period of the sley.

(Problems to be Solved by the Invention) However, in the weft inserting guide device disclosed in Japanese Patent Application Laid-Open No. 59-71461, the position of the magnetic flux generating coil is near the base end of the guide member, which is away from the magnetic flux generating area called the guide hole. For,
The energy efficiency for generating magnetic flux within the guide hole is extremely poor, making it inevitable to increase the size of the coil and waste energy. Furthermore, the state of magnetic flux generation within the guide hole becomes unbalanced, far from a state in which contact between the shuttle and the circumferential wall of the guide hole can be avoided.

Structure of the Invention (Means for Solving Problems) Therefore, in the present invention, a guide hole is provided which has at least one set of opposing surfaces that can surround at least a portion of the shuttle, and a guide hole is provided that allows the shuttle to pass through a group of warp threads into a warp opening. A guiding path for the shuttle is formed by providing the same magnetic poles to opposing surfaces of the pair of approachable shuttle guide members, and arranging a large number of shuttle guide members so that the magnetic poles of the opposing surfaces of the pair alternately have different polarities. Formed.

(Function) That is, as the shuttle crosses the magnetic flux region in the guide hole where the same magnetic poles on both opposing surfaces are generated, the magnetic flux is concentrated on the side surface of the shuttle, and an eddy current is generated on the same side surface. This eddy current is generated in a direction that cancels out the magnetic flux, and the shuttle receives a repulsive force from the magnetic pole. Therefore, the shuttle receives a repulsion in the direction away from the opposing surfaces, and the flight path of the shuttle is restricted to the center of the guide hole. This avoids contact between the shuttle and the circumferential wall of the guide hole, eliminating the need for oil spraying on the shuttle, which would lead to deterioration in the quality of the woven fabric. In addition, since the magnetic poles on the opposing surfaces are set to be different magnetic poles between adjacent guide members, when the shuttle crosses over both guide members, eddy currents are generated on the side surfaces of the shuttle corresponding to both guide members. The direction is the opposite direction.

Therefore, the two hot currents do not cancel each other out, and the repulsion between the shuttle and the magnetic pole on the opposing surface is performed more effectively. Moreover, since the magnetic poles are set on the circumferential wall surface of the guide hole, the efficiency of generating magnetic flux within the guide hole is extremely high, and the weight of the shuttle guide device can be reduced.

(Example) An example in which the present invention is embodied in a loom equipped with a weft insertion device using a linear motor will be described below with reference to FIGS. 1 and 2.

The shuttle s1, which is ejected into the warp shedding by an electromagnetic accelerating means using a linear motor, has a square pipe shape with a sharp tip, and a gripping lever 1 rotates around a shaft 2 at its rear end and side surface. The shuttle S1 is supported so that it can be pressed against the side wall surface of the shuttle S1 by a pressing spring (not shown). That is, the weft Y can be gripped between the gripping lever 1 and the side wall surface.

As shown in FIG. 2, there is a warp group Tl on the slay 3.

A large number of shuttle guide members 4A and 4B that can pass through T2 and enter the warp opening are arranged facing the reed 5, and the shuttle S1 is ejected into the opening formed by the upper and lower warp groups Tl and T2. are guided along 60 rows of guide holes of a large number of shuttle guide members 4A, 4B. The shuttle guide members 4A, 4B are implanted in a channel-shaped block 8 of a predetermined length at a ratio of more than 5 pieces per shuttle S1 length, and in this way, the shuttle guide members 4A, 4B
, 4B are planted on the slay 3. Therefore, the shuttle S1 is guided in flight intersecting at least four shuttle guide members 4A, 4B.

The guide hole 6 is formed in a rectangular shape that is slightly larger than the rectangular cross section of the shuttle S1, and the upper corner of the guide hole 6 on the reed 5 side is opened as a slit 7. Permanent magnets 9A are provided on the upper and lower and left and right opposing surfaces 6a and 6b of the guide hole 6.
, 9B are arranged, and the opposing surfaces 6a and 6b are set to have the same magnetic pole. Then, as shown in FIG. 1, a surface 6a facing the guide hole 6 of the shuttle guide member 4A
.

6b are each set to one magnetic pole (for example, S pole and N pole), and the opposing surfaces 5a, 5b of the guide hole 6 of the shuttle guide member 4B between each shuttle guide member 4A
are respectively the other magnetic poles (N poles).

and south pole), and the shuttle guide member 4A,
The magnetic poles N and S on the wall surface of the guide hole 6 of 4B are alternately exchanged.

Now, the shuttle S1 holding the weft Y flies through the guide holes 6 of the shuttle guide members 4A and 4B arranged as described above, and the weft Y held by the shuttle S1 is pulled through the guide holes 6. . After the weft insertion is completed, the weft yarn Y escapes from the guide hole 6 through the slit 7 and is driven into the front W1 of the woven fabric W by the reed 5. When the shuttle S1 flies within the guide hole 6, the opposing surfaces 6a and 5b of the guide hole 6
Eddy currents n, s corresponding to the magnetic poles are generated on the side wall surface of the shuttle S1 facing the magnetic poles N, S of the shuttle S1. That is, a counterclockwise eddy current n is generated on the side wall surface of the shuttle S1 facing the magnetic pole N, a clockwise eddy current S is generated on the side wall surface of the shuttle S1 facing the magnetic pole S, and the shuttle S1 It receives repulsion from both. The repulsive force from the magnetic TIN, S is larger as the distance from the shuttle S1 side is smaller, so
The closer the shuttle S1 is to the wall surface of the guide hole 6, the more the shuttle S1 is pushed back to the center of the guide hole 6.
Contact with the wall surface of the guide hole 6 is avoided. The flight state of the shuttle S1 without contact with the shuttle guide members 4A, 4B eliminates the need for oil spray for smooth contact with the shuttle guide members. Therefore, oil does not adhere to the weft yarn Y drawn through the guide hole 6, and deterioration in the quality of the woven fabric W due to oil stains is avoided. In addition, there is no possibility of wind floss near the oil supply device that sprays oil as in the prior art, and such wind floss caused by surface stains is not woven into the woven fabric W. The oiling device that evenly sprays a small amount of oil onto the shuttle surface is extremely complex, so omitting this device brings significant mechanical and cost advantages.

A plurality of eddy currents n, s occur in the longitudinal direction of the shuttle S1, but since the directions of adjacent eddy currents n, s are opposite, the adjacent eddy currents n, s do not cancel each other out, and the shuttle guide member Permanent magnets 9A, 9B on 4A, 4B and shuttle S1
The repulsion between the two is effective. Moreover, in this embodiment, the surface 6a facing the guide hole 6 of one shuttle guide member
, 6b are set to be the same, the magnetic flux from the permanent magnet tends to concentrate on the shuttle S1, which is also effective in increasing the repulsion between the shuttle 31 and the permanent magnet.

Moreover, the shuttle S by the shuttle guide members 4A and 4B
The non-contact guidance of No. 1 alleviates the restriction of guiding the shuttle while the slay 3 is stationary, and it is possible to shorten the period during which the slay 3 is stationary, which leads to a reduction in whipping acceleration. Therefore, the loom can be operated at high speed while suppressing wear and damage to beating-related members. Moreover, the opposing surface 5 of the guide hole 6
Permanent magnets are installed in a and 5b to improve magnetic flux generation efficiency and magnetic flux generation balance, thereby reducing the weight of the reed swinging member that leads to high-speed operation, and providing effective non-contact guidance for the shuttle S1. can be achieved.

In addition, in this embodiment, the shuttle guide member 4A.

The installation interval of 4B exceeds 5 per length of shuttle S1, and the shuttle guide function is high, but the installation interval of shuttle guide members is set considering the increase in weight and energy consumption. It is desirable to do so. There are no particular restrictions on the material of the shuttle guide members 4A and 4B as long as they are not magnetized, but in case they come into contact with the shuttle S1, it is recommended to use sufficiently rigid materials such as stainless steel or carbon fiber reinforced plastic. preferable. Further, as a permanent magnet, rare earth cobalt type magnets are preferable because they can obtain a large magnetic flux density.

Of course, the present invention is not limited only to the above-mentioned embodiments, and for example, the shuttle guide member 4 in the above-mentioned embodiments.
A magnet may be installed only on either the upper or lower or left or right opposing surfaces of A and 4B (in this case, the magnets may also be placed on the opposing surfaces of
Set so that the A poles are the same. This is to prevent the eddy currents on the one opposing surface from canceling each other out through the eddy currents incidentally induced on the other opposing surface.

As an embodiment in which magnetic boundaries are applied only to the pair of opposing surfaces of the guide hole, the configurations shown in FIGS. 3 and 4 are also possible. The shuttle S2 used in this embodiment has stators arranged vertically facing each other and has a structure suitable for being ejected from a near motor. It receives the acceleration energy from the linear motor. The guide holes 14 of the shuttle guide members 13A and 13B that guide the shuttle S2 can surround the shuttle S2 except for one vertical piece 10, and the gripping lever 15
The weft yarn Y gripped by the guide hole 14 runs outside the guide hole 14.

Opposing surfaces 14a sandwiching the horizontal plate portion 12.

Permanent magnets 16A and 16B are arranged on 14b, and the same magnetic poles are provided on opposing surfaces 14a and 14b.

The magnetic poles N and S on the opposing surfaces are set to alternate along the shuttle guide member row. In this embodiment, there are magnets 16A near the inner surfaces of both vertical pieces 10°11.
, 16B, and the magnets 16A, 1
A repulsive force is also generated between the vertical piece 6B and the vertical piece 10.11, and contact between the shuttle S2 and the shuttle guide members 13A and 13B is avoided in the same manner as in the first embodiment.

Furthermore, the present invention is applicable to looms that eject shuttles by mechanical impact.

Effects of the Invention As detailed above, in the present invention, the same magnetic poles are provided on the opposing surfaces of the guide holes to increase the magnetic flux generation efficiency and to optimize the balance of magnetic flux generation. Effective non-contact guidance of the shuttle can be achieved while reducing the weight of the swinging member. Further, since the N and S of the magnetic poles are set alternately along the shuttle guide member row, it is possible to avoid cancellation of eddy currents generated adjacently on the shuttle, and to make the interaction between the magnetic poles and the shuttle more effective. A repulsive effect can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment embodying the present invention.
The figure is a perspective view of essential parts showing a state in which the shuttle guide member guides the shuttle, FIG. 2 is a side sectional view, FIG. 3.4 shows another example of the present invention, FIG. The figure is a perspective view of essential parts. Shuttle guide members 4A, 4B, 13A, 13B. Guide holes 6, 14, opposing surfaces 6a, 6b, magnet 9A. 9B, 16A, 16B, Shuttle SL, S2, Slit 7゜Patent applicant Toyota Industries Corporation Fuji Electric Co., Ltd.

Claims (1)

[Claims] 1. A shuttle guide member is provided with a guide hole having at least one set of opposing surfaces capable of surrounding at least a portion of the shuttle, and is capable of passing through a group of warp threads and entering the warp opening. A weft insertion shuttle guide device for a loom, wherein a shuttle guide path is formed by arranging a large number of shuttle guide members such that the magnetic poles of opposing surfaces of the set are alternately different.