JPH08232138A - Guide unit for rapier band - Google Patents

Abstract

PURPOSE: To provide a guide unit, capable of stabilizing the travel of a rapier band, suppressing the abrasion of the rapier band and reducing the breakage of warp yarns or damage to the warp yarns by installing a regulating surface of a protruding guide member attached to the tip undersurface of the rapier band in each band guide. CONSTITUTION: This guide unit for a rapier band is obtained by attaching a guide member 1 having an inverted T-shaped cross section to the tip undersurface of the rapier band B, forming a recessed groove in the horizontal direction in each band guide 3 provided separately in the picking direction side by side on a sley S, forming a surface for regulating the side of the guide member 1 and a surface for regulating the top surface in the recessed groove and further a surface for supporting the undersurface of the rapier band on the top surface of the band guide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide unit for a rapier band, and more particularly to a rapier band for a rapier of a type which guides the running of the rapier band by a plurality of band guides arranged side by side on a sley in the weft insertion direction. It relates to the improvement of guidance technology.

[0002]

2. Description of the Related Art As a rapier unit of the type described above, the conventional Japanese Utility Model Publication No. 3-11265, JP-A-52-25
No. 160 and JP-A-4-214441. According to the conventional technique disclosed in Japanese Utility Model Publication No. 3-11265, a plurality of band guides are arranged in a weft insertion direction in a zigzag manner in a row and a rapier band is formed by a horizontal concave groove of the band guide. It guides the upper and lower sides and side surfaces of both side edges. In addition, JP-A-52-251
In the prior art disclosed in No. 60, a rapier band is run on a sley, and a plurality of band guides are arranged side by side in a line in the weft insertion direction so as to be arranged on the opposite side of the repier band from the reed. It guides the upper and side surfaces of the edge. Further, in the prior art disclosed in Japanese Patent Application Laid-Open No. 4-214441, a web having a flat upper surface is lined up in a line in the weft insertion direction as a band guide on a sley, and the upper surface of the web forms a lower surface of a rapier band. Is guiding you.

[0003]

However, the fairness 3-1
In the case of the conventional technique of No. 1265, since the side surface of the reed-side end edge of the rapier band is also guided, the distance between the band guide and the reed is narrowed. As a result, the degree of bending of the warp inevitably increases in this portion, and the warp is easily damaged (including not only mechanical damage but also thermal damage due to friction). Also, since the band guide also guides the upper surface of the rapier band, it is necessary to design the shape of the rapier head so as to avoid the upper surface of the band guide, and the rapier head becomes larger and has a so-called top-heavy structure, which makes its running difficult. Easy to be stable. Further, since the rapier band travels while being guided by the upper and lower surfaces and the side surfaces, the contact area with the band guide becomes large, and the wear as a whole becomes faster accordingly. In addition, there is a problem that debris and the like caused by the wear of the rapier band adheres to the warp and the woven fabric and stains them. Further, with the above-mentioned top-heavy structure, during braking for handing over the weft, the center of gravity is put forward due to inertia associated with traveling, and the rapier head is in a forward leaning state. As a result, a large load is applied to the lower surface of the rapier band (particularly the tip portion) due to the pressing force, and the wear of this portion is promoted. Also, due to this reaction, the center of gravity is applied to the rear side when the rapier retreats. Therefore, in the case of a band guide that also guides the upper surface, the upper surface of the above-mentioned portion is also worn faster.

Further, in the case of the prior art of Japanese Patent Laid-Open No. 52-25160, since the rapier band runs on the sley,
It runs by rubbing on the warp below the opened warp sheet, and it is easy to damage the warp. In addition, the rapier band, especially its tip, is lifted by the lower warp sheet that closes when the rapier band retracts, and the running tends to be unstable.

In the case of the prior art of Japanese Patent Laid-Open No. 4-214441, the rapier band is moved forward and backward (in the warp direction) because it simply travels on a band guide (web) having a flat upper surface.
Also, the rapier band swings upward, causing flapping, and the running of the rapier band becomes unstable. Along with this, delivery of the weft thread becomes uncertain, and delivery mistakes or collisions of left and right rapiers are likely to occur. In order to prevent such swinging of the rapier band during traveling, it is necessary to make the rigidity of the rapier band extremely high. However, if the rigidity is increased as described above, a large drive load is applied to the drive system of the rapier band, which is not preferable.

In view of the current state of the art, it is an object of the present invention to suppress wear of a rapier band and stabilize its running. It is also an object of the present invention to reduce warp breakage and warp damage and facilitate downsizing of the rapier head.

[0007]

Therefore, in the present invention, therefore, a convex guide member extending in the longitudinal direction of the rapier band and extending in the longitudinal direction thereof and having a width narrower than the width thereof is attached, and at least the guide member is provided in each band guide. The gist of the present invention is to have a supporting surface for contacting and supporting the lower surface of the rapier band and a regulating surface that contacts the side surface of the.

[0008]

When the rapier band is running, the regulation surface of the band guide comes into contact with the side surface of the guide member to suppress the shake of the rapier band and to open the upper surface and the side surface of the rapier band.

[0009]

1 and 2 show an embodiment of the guide unit according to the present invention, in which a guide member having an inverted T-shaped cross section is provided on the lower surface of the rapier band B as shown in FIG. It is installed. Correspondingly, a horizontal groove 31 is formed in the band guide 3 as shown in FIG. The concave groove 31 is formed with a side surface restricting surface 31 a that contacts the side surface of the guide member 1 and an upper surface restricting surface 31 b that contacts the upper surface. A support surface 32 that contacts the lower surface of the rapier band B is formed on the upper surface of the band guide 3.

FIG. 3 shows an arrangement state of the band guide 3 as described above. That is, the plurality of band guides 3 are arranged on the sley S so as to be spaced apart from each other in the weft insertion direction. However, even if they are staggered as shown in FIG. 4, they are shown in FIG. As described above, two pieces may be arranged in a line so as to form a pair.

The guide member 1 attached to the rapier band is preferably made of a hard material in consideration of the problem of wear. Further, such a guide member 1 is provided at the tip of the rapier band. Here, the "tip portion" refers to a portion that protrudes from the drive mechanism and is not entangled with the drive mechanism when the rapier head is at the most retracted position. It may be at any position as long as it is this part, and may be part or all.

Regarding the relationship between the length of the guide member 1 and the interval between the band guides 3, it is desirable that the guide member 1 is always guided by two or more band guides 3. That is, when the rapier band B is running, unless the guide member 1 is always guided by the two or more band guides 3, the band guides 3 are arranged in a staggered manner as shown in FIG. In this case, the guide of the rapier band B by the band guide 3 is limited to only one side surface of the support surface 32 and the guide member 1, and the rapier band B cannot be guided in a stable state. In addition, as shown in FIG.
Even when the individual band guides 3 are paired and guided, the operation of the tip end of the guide member 1 once slipping out of the band guide 3 and entering again as the rapier band B travels is repeated. Not preferable.
Therefore, it is desirable that the length of the guide member 1 be longer than the interval between the three adjacent band guides 3, or the interval between the band guides 3 be shorter.

The band guide 3 shown in FIG. 2 is provided with the side surface restricting surface and the upper surface restricting surface, but at least the side surface restricting surface is sufficient for implementing the present invention. The embodiment shown in FIG. 6 has such a band guide 3
Is shown. However, it is certain that the running of the rapier band will be more stable if both the side regulating surface and the upper regulating surface are provided as in the embodiment shown in FIGS. 2 and 7 to 9. In each of the illustrated examples, the guide member 1 projects from the central portion of the lower surface of the rapier band B, but may be projected from any position on the lower surface as long as it fits the shape of the corresponding groove of the band guide 3.

[0014]

Due to the existence of the regulation surface on the band guide,
Vibration of the rapier band while running is greatly suppressed. By appropriately selecting the shape of the guide member as described above, it is possible to effectively suppress not only the front-back (warp direction) but also the vertical deflection.

Since the upper surface of the rapier band is completely opened by the band guide that supports only the lower surface of the rapier band and engages only with the guide member, the design space of the rapier head can be freely set and its size can be reduced. It will be easy.

For the same reason, the opening angle of the warp sheet can be set small. Therefore, the amount of change in warp strain and stress is reduced, and as a result, warp breakage is significantly reduced.

There is no portion on the band guide that directly guides the side surface of the rapier band. Therefore, the gap between the reed and the band guide becomes wider, the bending of the warp yarn becomes smaller, and the damage and warp breakage of the warp yarn are reduced.

Since the frictional contact between the rapier band and the band guide is limited to the lower surface of the rapier band, the wear of the rapier band can be minimized.

Further, since the band guide and the rapier band are separated by design, the design of the rapier head is not restricted by the band guide. As a result, the problem of wear due to the above-mentioned top-heavy structure does not occur.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the structure of a rapier band according to the present invention.

FIG. 2 is a side view showing an example of a band guide of the same.

FIG. 3 is a side view, partly in section, showing an example of the configuration around the guide unit of the present invention.

FIG. 4 is a perspective view showing an example of arrangement of band guides according to the present invention.

FIG. 5 is a perspective view showing another example of arrangement of band guides according to the present invention.

FIG. 6 is a cross-sectional view showing another example of the guide unit of the present invention.

FIG. 7 is a cross-sectional view showing another example of the guide unit of the present invention.

FIG. 8 is a cross-sectional view showing another example of the guide unit of the present invention.

FIG. 9 is a cross-sectional view showing another example of the guide unit of the present invention.

[Explanation of symbols]

 B rapier band 1 guide member 3 band guide 31 concave groove R reed S sley T warp

Claims (2)

[Claims] 1. A type in which the running of a rapier band is guided by a plurality of band guides that are arranged side by side in the weft insertion direction on a sley, the rapier band having a tip lower surface extending in the longitudinal direction thereof and having a width thereof. A guide for a rapier band, characterized in that a narrower convex guide member is attached, and each band guide has a restricting surface for contacting at least a side surface of the guide member and a supporting surface for supporting and supporting a lower surface of the rapier band. unit. 2. The guide unit according to claim 1, wherein each of the band guides further includes a regulation surface that comes into contact with the upper surface of the guide member in addition to the side surface regulation surface.