JPH0336547Y2 - - Google Patents

Description

[Detailed description of the invention] ≪Industrial application field≫ This invention is a weft gripping device in a fluid jet loom, and more specifically, a function that repairs textile defects and automatically restarts the machine after the machine stops due to incomplete weft insertion. The present invention relates to a weft gripping device in a fluid jet loom.

≪Prior art and its problems≫ In general, when an abnormality occurs in weaving in a fluid jet loom that rotates at high speed, an abnormal stop signal, such as a weft insertion error signal or an abnormal warp weft signal, is issued immediately after the abnormality is discovered. Even if the drive of the loom is stopped due to a signal or an artificial abnormal stop signal, in order to prevent each part of the loom from being destroyed due to excessive deceleration, the inertial operation is performed for about one cycle after the abnormal stop signal is output. The machine is set to stop after the For this reason, conventionally, when a fluid injection loom stops due to an abnormal stop signal,
The next weft insertion cycle will be completed before the machine stops. Therefore, since it is necessary to remove this weft thread, these operations become extremely complicated. Moreover, in repairing a weft insertion error, the machine must be reversed to remove the erroneous weft yarn, which is a complicated operation and requires skill.

In order to avoid such a situation, when the loom is operating normally, the weft thread gripper should open and close normally, and when an abnormal stop signal of the loom is detected due to a weft insertion error, etc. closes the weft gripper, grips the weft fed to the main nozzle, prevents the weft from being fed to the warp opening, and reverses the loom until the cause of the loom abnormal stop signal can be resolved. All you have to do is make it possible.

In view of these facts, the invention of JP-A-58-208440 has been disclosed. However, in this invention, the lever that swings by the cam during steady operation and the connecting rod for opening and closing the gripper are engaged with each other by a spring, so that high-speed followability is extremely poor. Further, it has the disadvantage that the movement of the cam is not transmitted to the gripper, and when returning from an inoperative state to an operating state, the impact is large and durability is lacking.

≪Purpose of the invention≫ This invention was proposed in view of the above-mentioned drawbacks of the weft gripping device in the conventional fluid jet loom. It is an object of the present invention to provide a weft gripping device that enables error weft processing and weft insertion control during automatic re-operation, and also ensures reliable operation and high-speed followability.

<<Embodiments>> This invention will be described in more detail below based on the attached drawings.

Figure 1 schematically shows the weft insertion prevention device and its surroundings in the fluid jet loom of this invention.
The weft yarn is inserted from a weft preparation device (not shown) through a weft gripper 2 that opens and closes at preset timings, and by a fluid jet from a main nozzle 3.

This weft gripper 2 has a drive lever 4 and a shaft 5.
The opening and closing of the spline shaft 1 is controlled via an intermediate lever 6 by a cam 8 slidably attached to the spline shaft 1 which rotates in synchronization with the loom.

More specifically, a cam follower 7 is pivotally supported at the end of the intermediate lever 6 in order to detect the lift amount of the cam 8, and the intermediate lever 6 is swung by the rotation of the cam 8. The swinging motion is transmitted to the drive lever 4 via the shaft 5. The upper end of the drive lever 4 is in contact with the lower end of the vertically movable rod 21 of the weft gripper 2. At the upper end of the vertically movable rod 21, a movable grip portion 25 is attached which contacts and separates from the fixed grip portion 24. The weft W is moved downward by the vertically movable rod 21 and moved to the movable side gripping section 2.
5 is gripped when it comes into contact with the fixed side gripping part 24. Then, when the vertically movable rod 21 is pushed up to displace the movable grip part 25 from the fixed grip part 24, the grip is released.

The cam 8 is slidably attached to the spline shaft 1, and more specifically, as shown in FIG. 80 is biased so as to come into contact with the cam follower 7. A roller 15 pivotally supported on the tip side of a lever 13 swingably attached to a rotating shaft of a rotary actuator 12 is in contact with the side surface of the cam 8 opposite to the side surface on which the spring 10 is seated.

When the rotary actuator 12 operates to swing the lever 13 toward the cam side, the roller 15 pushes the cam 8 against the bias of the spring 10, and the lift portion 80 that is in contact with the cam follower 7 releases the contact. push me to do it. That is, the roller 15 of the rotary actuator
advances to the position 15b shown by the dashed-dotted line, and pushes the cam 8 against the bias of the spring 10 to the position 8b shown by the dashed-dotted line. Then, the contact between the cam follower 7 on the intermediate lever 6 side and the lift portion 80 of the cam 8 is released.

It should be noted that the rotary actuator 12 operates at a predetermined timing to be described later, and as long as it rotates to swing the lever 13, it does not matter whether the operating source is electromagnetic force, fluid force, or the like.

<<Operation of the invention>> During normal (normal) weaving, as shown in FIG. are in contact. As a result, the cam follower 7 detects the lift amount of the cam 8, swings the intermediate lever 6 and the driving lever 4 connected thereto, and causes the weft gripper 2 to operate to grip and release the weft.

Then, when incomplete weft insertion occurs and a machine stop signal is output from a weft detection device (not shown), the rotary actuator 12 is activated, the roller 15 moves to the position 15b indicated by the dashed line, and the lift section 8 of the cam 8
0 and the cam follower 7 are released. Then, the cam follower 7 is forcibly released from the abutting engagement with the large radius part of the cam lift part 80, and the lift part 80
It comes at the same or smaller radius position than the small radius part of. Then, the intermediate lever 6 rotated clockwise in FIG. 1, rotated the drive lever 4 clockwise, lowered the vertically movable rod 21 of the weft gripper 2, and moved the movable gripping section 25 to grip the weft W. state. Then the next cycle's main nozzle 3
Even if this injection is performed, the weft yarn W is not inserted.

After correcting the weft insertion error, the machine is reversed about one rotation and stopped at the restart position with a crank angle of about 180 degrees.
At this time, the rotary actuator 12 is actuated at a predetermined timing, for example, by a 0 degree crank angle signal, and the weft gripper 2 is kept in a gripping state in the same manner as in the above operation.

Thereafter, the machine is restarted, and the operation of the rotary actuator 12 is stopped at a predetermined timing, for example, by a 0 degree crank angle signal. Then, the cam 8 is moved to the normal operating position due to the bias of the spring 10.
That is, it returns to the lift section 80 and performs subsequent weaving.

Note that the above-mentioned predetermined timing may be a timing when the lift portion 80 is at a small radius portion, and the lift portion 80 may be returned to its original position as required while the loom is stopped.

In the above explanation, the cam follower 7 is the cam 8.
Although the weft gripper 2 is set to grip the weft W when the weft gripper 2 is in contact with the small radius portion of the lift portion 80, the present invention is not limited thereto. That is, by changing the mounting positional relationship of the cam 8, the intermediate lever 6, the drive lever 4, etc., the weft gripper 2 can grip the weft W when the cam follower 7 is in contact with the large radius part of the lift section 80. Of course, it can be applied even if it is in the current state. In short, when incomplete weft insertion is performed and a machine stop signal is output, the rotary actuator 12 rotates and forces the cam follower 7 to be in the state where the weft gripper 2 grips the weft W. All that is required is to move the cam 8 on the spline 1.

Furthermore, in the above description, the movable side gripping part 25 of the weft gripping device 2 is positioned on the upper side, and the fixed side gripping part 24 is positioned on the lower side. However, this invention is not limited to this, and the movable side gripping section may be positioned on the lower side so that when the movable side gripping section moves upward, it grips the weft yarn. Of course. However, even in this case, it is necessary to make some mechanical changes.

<<Effect of the invention>> As described above, when incomplete weft insertion or the like occurs and an abnormal stop signal of the loom is issued, the weft gripping device becomes in a state of gripping the weft. Therefore, even if the main nozzle 3 injects fluid for weft insertion in the next cycle, the weft is not inserted into the warp opening, and a stop signal is issued after the loom stops abnormally. There is no need to remove the remaining weft yarns from the warp shedding, processing of misplaced weft yarns, etc. can be carried out extremely easily, and appropriate weft insertion control can be performed at the time of automatic restart.

Moreover, according to this invention, the operation of the weft thread gripper 2 can be controlled by instantly changing the operating position of the cam 8 that controls gripping and release of the weft thread of the weft thread gripper.
This is not only convenient for fluid jet looms that require high-speed operation, but unlike conventional machines, the transmission member that transmits the movement of the cam to the weft gripper does not have an engagement point, so it can be used at high speeds during steady operation. without compromising trackability,
In addition, the operation of the weft gripper can be smoothly controlled, and there are no problems in terms of durability.

[Brief explanation of the drawing]

FIG. 1: A perspective view showing the outline of the weft gripping device and its surroundings in the fluid jet loom of this invention. Figure 2;
FIG. 2 is a side view of a part of the weft gripping device in the fluid jet loom of this invention. 1... Spline shaft, 2... Weft gripper, 3... Main nozzle, 4... Drive lever, 5... Shaft, 6... Intermediate lever, 7... Cam follower, 8... Cam.

Claims (1)

[Claims for Utility Model Registration] This is a type of system that opens and closes the weft gripper by detecting the lift amount of a cam 8 that rotates in synchronization with the rotation of the machine, and during steady operation, the lift portion 80 of the cam 8 The cam follower 7 is arranged so as to be in contact with the cam follower 7 that detects the lift amount of the machine, and when a machine stop signal is output, the cam follower 7
The cam 8 moves from the lift portion to a predetermined portion of the cam surface having the lift amount when the weft gripping device is in the weft gripping state.
A weft gripping device for a fluid injection type loom, characterized in that a mechanism is provided for forcibly moving the cam 8 and returning the cam 8 from the predetermined portion to the lift portion 80 at a predetermined timing.