JPH08231U - Weft repair device for loom - Google Patents

Abstract

(57) [Abstract] [Purpose] When a weft insertion failure occurs and the loom is stopped, and when the defective weft is removed, the opening drive is driven by disconnecting the connecting portion between the shedding drive device and the main shaft of the loom. By exposing the weft yarns before weaving, removing the defective weft yarns, and starting the weft yarns, the beating operation is not performed unnecessarily, thereby preventing the weft step. Another object of the present invention is to start weaving without inserting the reeds by inserting the weft yarns into the warp shed row before starting the loom and to prevent the occurrence of a weft bar more reliably. [Structure] After the loom is stopped, the clutch is stepwise operated to disconnect the main shaft of the loom main body and the shedding drive device. After that, the opening drive device is driven to expose the defective weft yarn before the weaving, and after the defective weft yarn is removed, the starting operation is performed again. Further, the weft thread is inserted into the warp opening row before starting.

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically repairing and restarting a defective weft yarn when a weft insertion defect occurs, and more particularly to a device for preventing weft.

[0002]

2. Description of the Related Art As a device for remedying a weft insertion defect, a device described in Japanese Patent Laid-Open No. 4-257348 is known. This is because when a weft sensor provided on the reverse weft insertion side detects a weft insertion failure, a stop signal is output, the loom further rotates and performs beating, and then the loom is stopped in the next weft insertion cycle. . This is because the loom is rotating at a high speed, and if it suddenly stops, the reed and shedding device will be overloaded and durability will be reduced. After stopping the loom, the main shaft of the loom is reversed to open and close the shedding device to expose the defective weft yarns before weaving, and then the weft removing device is operated to remove the defective weft yarns and restart. ing.

[0003]

[Problems to be Solved by the Invention] When removing defective weft insertion yarns, it is necessary to reverse the weaving machine spindle to expose the defective weft yarns before weaving. However, during this reverse movement, the reeds make a beating motion. Become. Then, the weft thread at the cloth fell position is pushed toward the cloth side, and the distance between the weft threads of the cloth cloth at the cloth cloth part is slightly different, resulting in a different texture of cloth at the cloth cloth part. There is. In addition, defective wefts are removed in the open state.When the loom is started after removing it, it is beaten once and then wefted and started in the next weft insertion cycle. Also, since the reed is performed without being wefted, there is a possibility that a weaving step may be generated as in the above case. In order to solve such a problem, the purpose of the present invention is to prevent weaving steps by removing unnecessary defective weft yarns and restarting the weft yarns.

[0004]

[Means for Solving the Problems] Therefore, in the first aspect of the present invention, after the weft insertion failure occurs and the loom is stopped, the defective weft yarn is exposed before weaving, and the defective weft yarn is removed and restarted. In the weft restoration device of the loom, after the loom is stopped, the connecting / disconnecting means for disconnecting the connecting portion between the opening device of the loom and the main shaft, and the opening drive device device is driven after the cutting operation of the device to perform opening / closing movement. Means, a means for exposing the defective weft after the operation of the means, a means for removing the exposed defective weft, and a connection broken by the connecting / disconnecting means after the weft is removed by the removing means. A means for joining the parts and restarting was provided. Secondly, a means for inserting the weft yarns into the warp shed row is provided after joining the connecting portions and before restarting.

[0005]

In this structure, when the defective weft yarn is exposed before the weaving, the beating operation is not unnecessarily performed, so that the occurrence of the weft can be prevented. Further, after the defective weft yarn is removed and when restarting, the weft yarn is inserted into the warp row and then beaten, so that the weft yarn cannot be beaten in an empty state, and the weft can be prevented more reliably.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to FIG. 1 is a loom main body, 2 is a heald frame, 3 is a shedding drive device for driving the heald frame, 4 is a motor as means for driving the shedding drive device 3, 5 is a main shaft of the weaving machine main body and the shedding drive device (not shown). A clutch serving as a means for connecting and disconnecting the connecting portion, and 6 is a control device, which includes a weft inserting device (not shown) of the loom body 1, a motor of the cloth winding / feeding device, a motor 4 of the shedding drive device 3, and a clutch. 5 are connected and control their operation. Although the weaving machine main body 1 is provided with a weft insertion defect detection sensor and a weft insertion defect yarn removing device, the description thereof is omitted because it is a known device.

Next, the operation will be described with reference to the time chart of FIG. The horizontal axis shows the main shaft angle of the loom, and the vertical axis shows the passage of time downward. Here, when the weft insertion defect detection sensor (not shown) detects the absence of the weft yarn near the spindle angle 300 of the loom, the control device 6 stops the loom body 1. After that, the control device 6 disengages the clutch 5. However, if the cause of the loom stop is something other than weft insertion failure, such as warp breakage, the loom cannot be immediately repaired and started. Therefore, the clutch 5 is not actuated. By operating the leveling device as described above, the warp yarns are aligned, the warp yarn tensions are made uniform, and the warp yarns are relaxed to prevent the weft bar. When stopping due to weft insertion failure, the clutch 5 is disengaged, which disconnects the main shaft of the loom body 1 from the shedding drive device. Next, the control device 6 operates the defective weft removing device disclosed in JP-A-4-257348 to remove the defective weft. At this time, in the conventional case as shown by the dotted line, the main shaft of the loom is reversed, the beating operation is performed once to cross the warp yarns into the open state, then the defective weft yarns are removed, and then the main shaft angle is aligned and started. However, the reverse operation is not performed in the embodiment of the present invention. As a result, it is possible to prevent the occurrence of a weaving bar due to unnecessary beating operation. Then, at D, the control device 6 issues a command to the weft insertion device (not shown) to insert one weft yarn into the warp shed row, and then at E, the operation is started. By inserting a single weft thread into the warp shed row before this start, the weaving operation is started as it is without so-called blanking, so that no bad beating operation is performed. Therefore, the weft bar can be prevented more reliably.

At the time of starting, the control device 6 controls the rotation of the motor of the cloth winding and warp yarn feeding device (not shown) provided in the loom body 1 to control the cloth fell position and the warp tension during normal operation. Rotation is controlled so that they are equal.

[0008]

EFFECTS OF THE INVENTION In the first aspect of the present invention, after the loom is stopped, the connecting portion between the shedding device of the weaving machine and the main shaft is cut by the connecting / disconnecting means, and the shed drive device is driven to perform the opening / closing movement while the reed is stopped. Since the warp yarns are crossed with each other to expose the defective weft yarns and remove the exposed defective weft yarns, the beating motion is not unnecessarily performed, and thus the weft can be prevented. Secondly, since the weft thread is inserted into the warp opening row after restarting after connecting the connecting portion with the clutch, the so-called idle operation does not occur, so that the weft is prevented more reliably. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a time chart diagram for explaining the operation of the present invention.

Claims (2)

[Scope of utility model registration request] 1. After stopping the loom due to weft insertion failure,
A weft restoration device for a loom, in which the defective weft is exposed before weaving, the defective weft is removed, and then restarted. Means for driving the opening driving device after the breaking operation of the device to perform opening / closing movement, means for exposing the defective weft after the operation of the means, means for removing the exposed defective weft, and the removing means. After the weft has been removed,
A weft restoration device for a loom, characterized in that means for joining and restarting a connecting portion cut by the connecting / disconnecting means is provided. 2. The weft restoration device for a loom according to claim 1, further comprising means for inserting the weft into the warp shed after the joining of the connecting portions and before the restart.