JPH0322300Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a tuck-in device, and more specifically, to an improvement of a device for forming selvedges by a tuck-in operation on a loom.

(Prior art and its problems) In the following description, the expression "forward and backward" is used, but "forward" refers to movement from the winding side to the delivery side along the warp direction, and "backward ”
It means the opposite.

The tack-in device has as its main components a gripper that grips the beaten weft yarn and a needle that pulls the gripped weft end into the shed. They are beginning to evacuate to

Conventionally, in the case of a general tuck-in device, the movement of the gripper in and out to retract the reed and the vertical movement to wind the weft around the needle are carried out by the forward/backward movement and vertical swing of the gripper mounting lever, and the movement of the gripper opening/closing bar is also carried out. The opening/closing and relaxation of the gripper for gripping the weft yarn is controlled by retraction.

In this way, the gripper mounting lever moves forward and backward and swings, which not only complicates the movement as a whole and becomes a hindrance to speeding up the work.
It was also difficult to seal the cam box, which caused problems such as failure due to the intrusion of fluff and decreased durability due to incomplete lubrication.

A proposal for avoiding the inconvenience caused by such swinging of the gripper mounting lever is disclosed in Japanese Patent Application Laid-Open No. 1983-
There is a device numbered 193557. In other words, the device of this prior application uses three shafts installed parallel to each other, of which the first shaft is used to move forward and backward and rotate, and the second and third shafts are used to move forward and backward. The tuck-in operation is performed by making the robot perform the tuck-in operation.

In this case, it is possible to avoid the above-mentioned disadvantages caused by the swinging of the gripper attachment lever, but due to its structure, the gripper is opened to release the weft when the weft is pulled in. For this reason, the yarn winding operation has to be stopped, and as a result, the weft yarn wound around the needle becomes free before being pulled in, resulting in a drawback that the pulling of the weft yarn by the needle becomes unstable.

In view of such circumstances, the purpose of this invention is to improve the stability of the weft pulling operation.

(Basic configuration for solving the problem) In this invention, as in the case of the prior art, three mutually parallel shafts are used, and the gripper pins are each spring-biased to the gripper holder. and a yarn guide are arranged vertically in parallel, so that the spring force that normally acts on the yarn guide also acts on the gripper pin, and when the weft is drawn in, it is held on the third axis by the retreat of the second axis. The cam roller presses the yarn guide to release the gripper pin from the spring force.

(Embodiment) As shown in FIGS. 1 and 2, the tuck-in device of this invention includes a needle shaft 2, a first gripper shaft 4, and a second gripper shaft, which are installed parallel to each other so as to be able to go in and out of a cam box 1. 6, these include a needle 8, as will be detailed later.
and gripper portions 10, 18, and 24, respectively.

That is, the needle shaft 2 moves forward and backward and rotates, and a needle holder 12 is fixedly fitted to the tip of the needle shaft 2. The needle holder 12 has a needle 8 extending downward in the weft direction and a needle 8 extending in the warp direction. A grit pulp shear 14 extending downward is fixedly attached thereto.

A connector 16 is firmly fitted to the tip of the first gripper shaft 4 that moves forward and backward, and a second gripper shaft 6 is loosely fitted to the side limb 16a of the connector 16. Further, the lower end of the gripper holder 18 is rotatably supported at the lower end of the lower limb 16b.

A roller guide 20 is tightly fitted to the tip of the second gripper shaft 6 that moves forward and backward. A vertical groove is cut into the side surface (the side that cannot be seen in the figure) of this roller guide 20, and a roller 22 supported by a gripper holder 18 is fitted into this vertical groove and guided. Further, a cam roller 40 that controls the spring pin 10 for relaxing the grip force is supported on the back surface of the roller guide 20.

Spring pin 1 is attached to gripper holder 18.
0 and the gripper pin 24 are vertically arranged parallel to each other. That is, the stopper 26 fixed to the gripper pin 24 is loosely fitted to the spring pin 10, and the spring 26 wound around the gripper pin 24 is loosely fitted to the spring pin 10.
8 is in contact with this stopper 26. Also,
A spring 30 wound around the spring pin 10 is in contact with a stopper 10a fixed to the spring pin 10.

In this way, by biasing the stopper 26 upward with the springs 28 and 30, the gripper piece 25 fixed to the lower end of the gripper pin 24 is biased upward, so that the gripper pin 24 and the spring pin 10 absorb external force. In the non-receiving state, the gripper piece 25 comes into contact with the lower surface of the gripper holder 18 by the force of both springs, and is in a state where it can strongly grip the weft.

Next, the operation will be explained with reference to FIGS. 3A and 3B.

Since the gripper push shear 14 pushes the gripper pin 24 due to the rotation of the needle shaft 2, the first
The second gripper shafts 4 and 6 move forward with the gripper pieces 25 open and engage with the weft ends. Then, as the needle shaft 2 rotates, the gripper push shear 14 releases the gripper pin 24, and the gripper piece 25 grips the weft end by the action of the spring 28. Then the second gripper shaft 6 moves forward,
The gripper holder 18 swings downward using its bearing as a fulcrum via the roller 22 fitted in the vertical groove of the roller guide 20, and moves the gripped weft yarn downward to assume a winding preparation posture. This state is shown in FIG. 3A.

Then, when the needle 8 enters the weft winding position through the upper side of the weft that is in the winding preparation position, the second gripper shaft 6 retreats, swings the gripper holder 18 upward, and removes the weft. Wrap the end around needle 8.

Then, while maintaining this state, the first and second gripper shafts 4 and 6 move back a little, and when the weft winding posture becomes sufficient, the needle 8 starts pulling the weft.

At this time, as shown in FIG. 3B, the cam roller 40 has already contacted the head of the spring pin 10 and pressed the spring pin 10 downward, so the contact between the stopper 10a and the stopper 26 is released, and as a result, the contact between the stopper 10a and the stopper 26 is released. Only the force of the spring 28 acts on the gripper piece 25, and the gripping force is weakened.

Thereupon, the weft end is pulled out from the gripper piece 25 without any breakage, and weft thread retraction progresses. The first and second gripper shafts 4 and 6 continue to retreat further, and when the weft thread withdrawal is completed, the needle shaft 2 begins to retreat, and the three shafts return to their original positions.

(Effects of the invention) Since the tuck-in operation is performed only by moving forward and backward of the three axes and rotating the axes, the movement is easy.
Easily adapt to higher speeds. In addition, since there is no up-and-down movement of the shaft, the cam box can be easily sealed, and lubrication is completely achieved without the harmful effects of fluff.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the tuck-in device of this invention in an assembled state, FIG. 2 is a perspective view showing the same in an exploded state, and FIGS. 3A and 3B are side views showing its operation. 2...Needle shaft, 4,6...Gripper shaft,
8... Needle, 10... Spring pin, 14
...Gritzpurputshear, 18...Grizpur holder.

Claims (1)

[Claims for Utility Model Registration] A first shaft 2 that can move forward and backward and rotate, and second and third shafts 4 and 6 that are parallel to the first axis and can move forward and backward are installed on a cam box. The first shaft has a needle and a grit pump shear 14 that presses down the yarn guide 24 by rotation of the first shaft, and the second shaft 4 has a , a gripper pin 10 spring-biased upward and a gripper piece 2 at the lower end.
The upper surface of the first stopper 10a, which is normally fixed to the gripper pin, is the lower surface of the second stopper 26, which is fixed to the yarn guide. A gripper holder 18 is slidably held via a connector 16 and is attached to the third shaft 6 so that the gripper piece is pressed against the opposing gripping surface by both springs. A roller guide 20 equipped with a cam roller 40 is held, and the gripper holder and the roller guide are connected by a connecting member 22. Immediately before pulling in the weft, the gripper holder is moved back by retracting the third shaft. At the same time as the holder is tilted to the lower weft winding position, the cam roller presses the gripper pin downward due to the tilting, and the contact between the upper surface of the first stopper and the second stopper is released. Tatsu-in device.