JPH0248663B2 - JETSUTORUUMUNOEFUTOGURITSUPAA - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a jet room such as an air jet room, a water jet room, etc., which fixes a weft yarn fed into an opening by an air jet or a water jet. Regarding the foot gripper.

[Conventional technology]

Conventionally, as a jet loom weft feeding device,
The one shown in FIG. 6 is known. In FIG. 6, 1 is a weft bobbin, 2 is a tensor, 3 is a length measuring roller, 4 is a length measuring drum, 5 is a driving mechanism for the length measuring drum, 6 is a suction tube, 7 is a weft gripper, 8 is a cam mechanism that opens and closes the weft gripper 7, and 9 is a nozzle. The drive mechanism 5 and the cam mechanism 7 are both driven by the main shaft of the loom. The weft thread 10 pulled out from the weft thread bobbin 1 is held by the weft gripper 7, and its length is measured by the length measuring roller 3 and stored in the suction tube 6. When opened at a predetermined timing by 8,
The nozzle 9 drives the warp into the opening.
Note that, in place of the suction tube 6, a storage drum is also known.

As shown in the figure, the weft gripper 7 used in the weft supply device described above has a structure in which the weft is held between disks, and the disks are usually kept in close contact with each other by a coil spring 7A. The weft gripper 7B is gripped by the weft gripper 7A, and is released while the cam mechanism 8 pushes up the weft gripper 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, in order to reliably grip the weft thread, it is necessary to tighten the coil spring 7A to increase the spring force and increase the pressing force of the disk, but if it is too large, the weft thread may be crushed or the cross section of the thread may be deformed. do. If it is turned into a textile in this state, it will appear as a "sink mark" on the textile fabric,
It becomes a defective product. Adjustment of the coil spring of the gripper needs to be done according to the yarn speed, spindle rotation speed (number of times of weft thread driving), weft thread thickness, etc.
This adjustment is extremely difficult. Further, depending on the weft, during use, the weft easily separates and accumulates between the disks, and in that case, the weft gets caught between the disks, making it impossible to grip the weft. In order to avoid this, the coil spring had to be extremely tightly tightened, but as a result, the disk 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 such conventional problems, and an object of the present invention is to provide a weft gripper that is easy to adjust and can grip weft threads reliably.

[Means to solve the problem]

The present invention has been made to achieve the above object.
As shown in the embodiments of FIGS.
A plurality of fixed thread guides 14 and movable thread guides 17 are provided, each having guide holes 15 and 20 through which 0 passes, and which are arranged at intervals and alternately so that each guide hole can be substantially straight. A rotating shaft 18 holding a yarn guide, the guide hole 20 of the movable yarn guide being connected to the guide hole 15 of the plurality of fixed yarn guides.
a rotating shaft 18 that moves the rotating shaft to a position away from the straight line in which the rotating shafts are arranged; pressing means 23 and 27 that applies torque in one direction to the rotating shaft; and The gist of this invention is a jet loom web gripper having a cam mechanism that rotates a shaft at a predetermined timing.

[Effect]

Weft gripper 1 of the present invention having the above configuration
According to No. 1, the weft thread 10 passes through guide holes 15 and 20 of the fixed thread guide and the movable thread guide, and the weft thread 10 passes through the guide holes 15 and 20 of the fixed thread guide and the movable thread guide, and is moved through the moving thread guide 1 via the rotating shaft 18 by a cam mechanism.
7 is moved to the position shown in FIG. 2, each guide hole 15, 20 becomes straight as shown in FIG. 3, and the weft thread 10 becomes freely movable. That is, gripping of the weft thread by the weft gripper 11 is released. Next, when the rotation shaft 18 is released from the cam mechanism, the pressing means (specifically, the magnets 23, 2
7), the rotating shaft 18 and the movable yarn guide 17 rotate as shown in FIG.
As shown in the figure, the weft yarn passes through each guide hole 15, 20 in a zigzag manner, and a large resistance is applied to the weft yarn, so that the weft yarn is restrained and cannot move. The weft threads are thus gripped. Here, the movable yarn guide 17 is rotated by the pressing means until the weft is restrained, and as a result, the angle θ formed by the weft becomes smaller and the frictional resistance increases, so that the weft can be gripped reliably.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to preferred embodiments of the invention shown in the drawings.

FIG. 1 is a perspective view showing a preferred embodiment of the present invention. The weft gripper, generally designated by the reference numeral 11, has a base 12 and a bar 13 fixed to the base 12, and a plurality of movable yarn guides 14 are fixed to the bar 13 in parallel at predetermined intervals. has been done. Each of the fixed thread guides 14 has a guide hole 15 through which the weft thread 10 passes, and all guide holes 15 are arranged substantially in a straight line. Although the guide hole 15 may be formed directly in the fixed thread guide 14, it is preferably formed of a wear-resistant material, for example, ceramic such as titanium oxide. Between each fixed thread guide 14, a movable thread guide is arranged in parallel. These movable thread guides have one end connected to the rotating shaft 1.
8, and the rotating shaft 18
are provided substantially parallel to the straight line in which the guide holes 15 of the fixed thread guide 14 are lined up. Note that 19 is a bearing that rotatably holds the rotating shaft 18. Each moving thread guide 17 also has a guide hole 20. The guide hole 20 of the movable yarn guide 17 is shown in FIGS. 2 and 3.
As shown in the figure, when the movable thread guide 17 almost overlaps the fixed thread guide 14, the fixed thread guide 1
As shown in FIGS. 4 and 5, the movable yarn guide 17 is formed in a position where it is linearly arranged with the guide holes 15 of No. 4, and as shown in FIGS.
When the thread pivots, the guide hole 15 of the fixed thread guide 14
can be moved away from the straight line. 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 the lever 22
A moving magnet 23 is held on the top surface. On the other hand, a bracket 25 is attached to the base 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 and the fixed magnet 27 are arranged with the same poles facing each other, so that a repulsive force acts between them. 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 rotating shaft 18. Note that, instead of using a magnet, a spring may be used as the pressing means.

A cam follower 30 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 similar to the conventional cam mechanism 8 shown in FIG. 6 or may be a modified version of the cam mechanism 8 shown in FIG. , magnets 23, 27
Any device that rotates against the repulsive force between the two may be used. In FIG. 1, 32 is a stopper plate fixed to the rotating shaft 18, and 33 is a stopper screw held in 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 configuration will be explained. The weft gripper 11 is the sixth
It is used in place of the weft gripper 7 of the weft feeding device shown in the figure. Weft thread 10 is fixed thread guide 1
4 guide hole 15 and moving thread guide guide hole 20
It passes through continuously. In FIGS. 2 and 4, due to the repulsive force between the fixed magnet 27 and the moving magnet 23, a directional torque is constantly acting on the rotating shaft 18. When this rotating shaft 18 is rotated counterclockwise by a cam follower 30 and a cam mechanism (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 is freely moved. pass. That is, the weft thread 10 is open. In this state, the weft is driven into the warp opening.

When the input is completed at the specified timing,
The restraint of the cam follower 30 by the cam mechanism is released, and due to the repulsive force between the fixed magnet 27 and the movable magnet 23, the rotary shaft 18 rotates clockwise from the position shown in FIG. rotate by a certain angle. Due to this rotation, the weft thread 10 is moved between the guide hole 15 of the fixed thread guide and the guide hole 20 of the movable thread guide, as shown in FIG.
As a result, a large frictional force due to the guide hole is applied to the weft thread 10, and the movement of the weft thread 10 is stopped. At the same time, the movable thread guide 17 is restrained by the weft thread 10, and is prevented from rotating further, and stops at that position, even though the torque due to the repulsive force of the magnet is acting on it. In this way, the weft thread 10 is reliably gripped by the weft gripper 11. When the next weft thread driving is performed, the rotating shaft 18 and the movable thread guide 17
is moved from the position shown in FIG. 4 to the position shown in FIG. 2 by the cam mechanism and cam follower 30. 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 increases and the angle θ formed by the weft thread becomes smaller, the frictional resistance against the weft thread increases, and the thread cannot be balanced at an appropriate angular position. The rotation of the movable thread guide is then stopped, and the weft thread is reliably restrained. In this way, the rotation angle of the movable thread guide 17 is automatically determined according to the quality of the weft thread, and it stops automatically, so there is no need for much adjustment, and the repulsive force between the magnets can be adjusted by adjusting the rough It is possible to respond to various conditions by simply adjusting the settings. Note that the number of fixed thread guides and moving thread guides may be appropriately determined by taking into consideration the coefficient of friction against the weft thread.
It is preferable to have 5 to 10 pieces each, since this provides gripping ability for most weft threads.

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. It goes without saying that various modifications can be made to the mechanism for supplying the weft yarn to the machine, for example, the means for measuring the weft yarn for one shot, or the means for storing the weft yarn.
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 gripper of the present invention uses a plurality of fixed thread guides 14 and movable thread guides 17 that are arranged alternately, so that the movable thread guides 17 can be held on the rotating shaft 18 and rotated. Since the guide holes 15 and 20 of each thread guide are
The linear shape shown in the figure allows the weft 10 to pass freely, and the zigzag shape as shown in FIG. 5 allows the weft 10 to be gripped. 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, depending on conditions such as yarn speed, number of revolutions, and yarn thickness,
There is almost no need for adjustment, making it extremely easy to handle.Moreover, it has excellent effects such as no gripping failure even if weft scraps etc. adhere to it, and it can be used stably for a long period of time. are doing.

Note that, as in the illustrated embodiment, when the repulsive force of a magnet is used as the pressing means to apply torque to the rotating shaft 18, manufacturing accuracy (accuracy of the repulsive force during manufacturing) is higher than when using a spring. In addition, there are advantages in that even if used for a long period of time, there is little change in characteristics and it can be used stably, and even higher speeds (for example, 1000 rotations/min) are possible.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a weft gripper according to an embodiment of the present invention, FIG. 2 is a sectional view showing the above-mentioned weft gripper with the weft threads released, and FIG. 4 is a sectional view of the weft gripper taken along a straight line, FIG.
FIG. 6 is a cross-sectional view taken along a straight line through the weft gripper shown in the figure, and FIG. 6 is a schematic perspective view showing a weft yarn feeding device using a conventional weft gripper. 10...Weft thread, 11...Weft gripper,
12...Base, 14...Fixed thread guide, 15...
... Guide hole, 17 ... Moving thread guide, 18 ... Rotating shaft, 20 ... Guide hole, 23 ... Moving magnet, 26 ... Adjustment screw, 27 ... Fixed magnet, 30 ... Cam follower.

Claims (1)

[Scope of Claims] 1. A plurality of fixed thread guides and movable thread guides, each having a guide hole for passing a weft thread, and arranged at intervals and alternately so that each guide hole can be substantially straight. a rotating shaft that holds the movable yarn guide and moves the guide hole of the movable yarn guide to a position away from the straight line in which the guide holes of the plurality of fixed yarn guides are lined up; A jet room lift grip characterized by having a pressing means for applying torque in one direction, and a cam mechanism for rotating the rotating shaft at a predetermined timing against the torque applied by the pressing means. Tupah. 2. The pressing means includes a movable magnet held by a lever connected to the rotating shaft, and a fixed magnet stationary at a position opposite to the movable magnet, and the movable magnet and the fixed magnet 2. A jet loom lift gripper according to claim 1, wherein the grippers are arranged with the same poles facing each other.