JPS6245755A - Weft gripper of jet loom - 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 Application Field] The present invention relates to a weft gripper for fixing a weft fed into an opening by an air jet or a water jet in a jet loom such as an air jet loom or a water jet loom. Regarding.

[Conventional technology]

Conventionally, as a jet loom weft supply device, one shown in FIG. 6 is known. In Fig. 6, l is a weft bobbin, 2 is a tensor, 3 is a length measuring roller, 4 is a length measuring drum, 5 is a drive mechanism for the length measuring drum, 6 is a sakunyong tube, 7 is a weft glyph bar, and 8 is a length measuring drum. Weft gripper-7
9 is a nozzle.

Both the drive mechanism 5 and the cam mechanism 7 are driven by the main shaft of the loom. The weft thread 10 pulled out from the weft thread pobbin 1 is measured by a length measuring roller 3 while being gripped by a weft gripper 7 and passed through a suction tube 6.
When the weft gripper 7 is opened at a predetermined timing by the cam mechanism 8, the weft gripper 7 is driven into the warp opening by the nozzle 9. Incidentally, a device using a storage drum instead of the suction tube 6 is also known.

As shown in Figure 1, the weft gripper 7 used in the above-mentioned weft yarn feeding device has a structure in which the weft is gripped by sandwiching it between disks, and normally the two disks are held in close contact with each other by a coil spring 7A. The cam mechanism 8 is configured to push up the glyph bar tappet 7B against the spring force of the coil spring 7A.

[Problem that the invention seeks to solve]

However, the above-mentioned weft gripper 7 had various problems. That is, to securely grip the weft thread.

It is necessary to tighten the coil spring 7A to increase the spring force and to increase the pressing force on the disk, but if it is too large, the weft thread may be crushed or the cross section of the thread may be deformed.

If the fabric is made into fabric in this state, "sink marks" will appear on the fabric, resulting in a defective product. Such adjustment of the coil spring of the gripper needs to be carried out according to the yarn speed, the number of rotations of the main shaft (the number of times of weft thread driving), the thickness of the weft thread, etc., but this adjustment is extremely difficult. Also, depending on the weft.

During use, the Nori shavings tend to separate and accumulate between the disks, and in this case, the Nori shavings become caught between the disks, making it impossible to grip the weft threads. In order to avoid this, we have no choice but to tighten the coil spring extremely tightly.

As a result, the disks often became deformed and became unusable. These problems become particularly serious as the weft becomes thinner.

The present invention has been made in view of these conventional problems.

It is an object of the present invention to provide a weft gripper that is easy to adjust and can grip weft threads reliably.

[Means for solving problems]

To achieve the above object, the present invention is shown in Figures 1 to 5.
As shown in the embodiment of the figure, a plurality of fixings, each having a guide hole 15,20 through which the weft thread 10 passes, are spaced one apart and alternately so that each guide hole can be approximately straight. A thread guide 14 and a movable thread guide 17.

A rotating shaft 18 that holds the movable yarn guide and moves the guide hole 20 of the movable yarn guide to a position away from the straight line in which the guide holes 15 of the plurality of fixed yarn guides are lined up; A jet loom wafer having a pressing means (23, 27) that applies torque in one direction to the shaft, and a cam mechanism that rotates the rotating shaft at a predetermined timing against the torque applied by the pressing means. The main topic is the soft gripper.

[Effect]

According to the weft gripper 11 of the present invention configured as described above, the weft yarn 10 passes through each guide hole 15, 20 of the fixed yarn guide and the movable yarn guide, and
When the movable thread guide 17 is moved to the position shown in FIG. 2 via the thread guide 8, each guide hole 15,20 becomes straight as shown in FIG. 3, and the weft thread 10 can move freely. That is, gripping of the weft thread by the weft gripper 11 is released. Next, when the rotation shaft 18 is released from the restraint by the cam mechanism, the one rotation shaft 18 and the moving thread guide 17 are rotated by the pressing means (specifically, the repulsive force of the magnets 23 and 27) as shown in FIG. However, as shown in FIG. 5, the weft thread 10 passes through each guide hole 15, 20 in a zigzag manner, and a large resistance is applied to the weft thread, so that the weft thread is restrained.

You will not be able to move. The weft threads are thus gripped. Here, the movable thread guide 17 is rotated by the pressing means until the weft thread is restrained, and as a result, the angle θ formed by the weft thread becomes smaller and the frictional resistance increases, so that the weft thread can be reliably gripped.

〔Example〕

The present invention will be explained in more detail below with reference to a preferred embodiment of the present invention shown in one drawing.

FIG. 1 is a perspective view showing a preferred embodiment of the present invention.

The weft gripper is generally designated by the reference numeral 11.

It has a base 12 and a bar 13 fixed to the base 12, and a plurality of fixed thread guides 14 are fixed in parallel to the bar 13 at predetermined intervals. Each of the fixed thread guides 14 has a guide hole 15 through which the weft thread IO passes.

All guide holes 15 are arranged substantially linearly.

Although the guide hole 15 may be formed directly in the fixed thread guide 14, it is preferably formed of a wear-resistant material 5, such as a ceramic such as titanium oxide. A movable thread guide 17 is arranged in parallel between each of the fixed thread guides 14 .

These movable yarn guides 17 are provided with one end held by the rotating shaft 18.

The guide holes 15 of the fixed thread guide 14 are provided substantially parallel to the straight lines. Note that 19 is a bearing that rotatably holds the rotating shaft 18. Each moving yarn guide 17 also has a guide hole 20. Guide hole 20 of moving yarn guide 17
As shown in FIGS. 2 and 3, the movable thread guide 17 is arranged in a straight line with the guide hole 15 of the fixed thread guide 14 when the movable thread guide 17 substantially overlaps the fixed thread guide 14. Moreover, as shown in FIGS. 4 and 5, when the movable yarn guide 17 pivots due to the rotation of the two-rotation wheel 18,
The fixed thread guide 14 can be moved to a position away from the straight line in which the guide holes 15 are lined up.

The guide hole 20 of the movable yarn guide 17 is also preferably made of a wear-resistant material, as in the case of the fixed yarn guide.

The rotating shaft 18 has a lever 22, and a moving magnet 23 is held on the upper surface of the lever 22. on the other hand.

A bracket 25 is attached to the heath 12, and the bracket 25 holds a fixed magnet 27 at a position opposite to the movable magnet 23 via an adjustment screw 26.

The moving magnet 23 and the fixed magnet 27.

The same poles are placed opposite each other and therefore.

A repulsive force acts between the two. This repulsive force applies clockwise torque to the rotation shaft 18 in FIGS. 2 and 4. That is, the fixed magnet and the moving magnet constitute a pressing means that applies torque in one direction to the one-rotation shaft 18. Note that instead of using a magnet, a spring may be used as the pressing means.

A cam follower 3o is attached to the end of the rotating shaft 18. The cam follower 30 is pressed against a cam mechanism (not shown) by the torque of the pressing means, and rotates the rotating shaft 18 following the cam mechanism. The cam mechanism for operating the cam follower 30 may be the same as the conventional cam mechanism 8 shown in FIG. 6 or may be a modified version of the cam mechanism 8 shown in FIG. 8 may be rotated against the repulsive force between the magnets 23 and 27. In FIG. 1, 32 is a stopper plate fixed to the rotating shaft 18, and 33 is a stopper screw held on a bracket fixed to the bearing 19. This constitutes a stopper that restricts the maximum rotation angle of the rotating shaft 18 when the rotating shaft 18 is not in use.

Next, the operation of the weft gripper 11 having the above structure will be explained. The weft gripper II is used in place of the weft gripper 7 of the weft thread feeding device shown in FIG.

The weft thread 10 passes continuously through the guide hole 15 of the fixed thread guide 14 and the guide hole 20 of the movable thread guide 17. Second
4, due to the repulsive force between the fixed magnet 27 and the movable magnet 23, one rotating shaft 18 is always
Clockwise torque is acting.

When this rotating shaft 18 is rotated counterclockwise by a cam follower 30 and a cam mechanism (1 not shown) against the repulsive force of the magnet and reaches the position shown in FIG. 2, as shown in FIG. The guide hole 15 of the fixed yarn guide 14 and the guide hole 20 of the movable yarn guide 17 are arranged in a straight line, and no restraining force acts on the weft thread 10 passing through them, so that the weft thread 10 passes freely. do. That is.

The weft thread 10 is open. In this state, the weft is driven into the warp opening.

When driving is completed at a predetermined timing, the cam follower 30 is released from being restrained by the cam mechanism, and the fixed magnet 27. Due to the repulsive force between the movable magnets 23, the two-rotation shaft 18 rotates clockwise from the position shown in FIG. Due to this rotation, the weft thread 10 becomes as shown in FIG.
The weft yarn passes through the guide hole 15 of the fixed yarn guide and the guide hole 20 of the movable yarn guide in a zigzag pattern, and a large frictional force is applied to the weft yarn by the guide hole.

The movement of the weft thread 10 is stopped. At the same time, the moving thread guide 17
is restrained by the weft thread 10, and even though the torque due to the repulsive force of the magnet is acting, further rotation is prevented and it stops at that position. Thus.

The weft thread IO is reliably gripped by the weft gripper 11. If the next weft thread drive is to be carried out.

The rotating shaft 18 and the movable yarn guide 17 are moved from the position shown in FIG. 4 to the position shown in FIG. 2 by the cam mechanism and the cam follower 30.
be moved. Thereafter, by repeating similar operations, the weft threads are gripped and released.

Here, the weft thread passes through the fixed thread guide and the movable thread guide in a zigzag pattern, and is configured to be restrained by receiving a large frictional resistance.The frictional resistance at this time is the angle formed by the weft thread as it passes in a zigzag pattern. The smaller θ is, the larger it becomes.

Therefore, even if a slippery weft thread is used, as the rotation angle of the movable thread guide 17 becomes larger and the angle θ formed by the weft thread becomes smaller, the frictional resistance against the weft thread becomes larger, and the balance is maintained at an appropriate angular position. The rotation of the moving yarn guide is stopped, and the weft yarn is reliably restrained. In this way, the rotation angle of the movable yarn guide 17 is automatically determined according to the yarn quality of the weft yarn, and it stops automatically, so there is no need for much adjustment, and the repulsive force between the magnets can be adjusted to the rough It is possible to respond to various conditions by simply adjusting the settings. The number of fixed thread guides and movable thread guides may be determined appropriately by considering the coefficient of friction against the weft thread, but if each has 5 to 10 pieces, it will be possible to grip most weft threads. So.

suitable.

Although the above embodiment describes the case where the weft gripper 11 of the present invention is used in combination with the weft yarn feeding device shown in FIG. 6, the present invention is not limited to this case. A mechanism for supplying.

For example, it goes without saying that the means for measuring the weft threads for one drive, the means for storing the weft threads, etc. can be changed in various ways. Further, the weft gripper of the present invention can be used in either an air jet loom or a water jet loom.

〔Effect of the invention〕

As described above, the weft glyph par of the present invention has a plurality of fixed thread guides 14 and movable thread guides 17 arranged alternately.
Since the movable yarn guide 17 is held by the rotating shaft 18 and can be rotated, the guide holes 15 and 20 of each yarn guide are formed in a straight line as shown in FIG. , and as shown in Figure 5,
By making it zigzag, it is possible to grip the weft thread 10. Moreover, since the gripping of the weft thread 10 does not involve pinching the weft thread as in the conventional gripping method, the weft thread will not be crushed or deformed into a flat shape, and the quality of the fabric will not be degraded. Furthermore.

There is almost no need to adjust the yarn speed per revolution, yarn thickness, etc., making it extremely easy to handle.

It has excellent effects such as being able to be used stably for a long period of time without causing poor gripping even if weft thread scraps or the like adhere to it.

In addition, if the repulsive force of a magnet is used as the pressing means to apply torque to the rotating shaft 18 as in the illustrated embodiment, the manufacturing accuracy (accuracy of the repulsive force during manufacturing) is higher than when a spring is used. It can be used stably with little change in characteristics even after long-term use, and even faster (for example, 10
The advantage is that 00 rotations/rotary furnace is possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a weft gripper according to an embodiment of the present invention. Figure 2 shows the weft gripper with the weft threads released.
5. FIG. 3 is a cross-sectional view of the weft gripper shown in FIG. 2 taken along the straight line ■-■. Figure 4 shows the above-mentioned weft gripper gripping the weft thread.
7. FIG. 5 is a cross-sectional view of the weft gripper shown in FIG. 4 taken along the straight line ■-■. FIG. 6 is a schematic perspective view showing a weft supply device using a conventional weft gripper.

Claims (2)

[Claims] (1) A plurality of fixed yarn guides and movable yarn guides, each having a guide hole through which the weft thread is passed, and which are arranged at intervals and alternately so that each guide hole can be approximately straight, and the movable yarn guides. A rotating shaft that holds a thread guide and moves the guide hole of the movable thread guide to a position away from the straight line in which the guide holes of the plurality of fixed thread guides are arranged, and a unidirectional torque applied to the rotating shaft. What is claimed is: 1. A jet loom weft gripper comprising: a pressing means for applying pressure; and a cam mechanism for rotating the rotating shaft at a predetermined timing against the torque applied by the pressing means. (2) The pressing means includes a moving magnet held by a lever connected to the rotating shaft, and a fixed magnet stationary and provided at a position opposite to the moving magnet, and is fixed to the moving magnet. The jet loom weft gripper according to claim 1, wherein the jet loom is disposed with the same pole facing the magnet.