JPH0819600B2 - Method for removing the cut weft yarn in a loom - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a cut weft yarn in a drum type weft yarn storage device.

[0002]

2. Description of the Related Art Conventionally, in a drum type weft yarn accumulating device, when a yarn breakage is detected between a yarn feeder and a rotating yarn guide, a loom is automatically stopped and then an operator is wound around the accumulating drum. The yarn processing work was performed to remove the weft yarn from the storage drum. In this work, the cutting thread connected to the weft thread to be extracted is also extracted, which is complicated.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to presume a drum type weft yarn accumulating device so that a yarn in a cut state can be easily removed at the time of yarn breakage from a yarn feeder to a rotary yarn guide. That is.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, a weft yarn fed from a yarn feeder is wound around a storage drum by a rotating yarn guide, and the weft yarn unwound by a locking pin is wefted into a warp yarn opening by a weft insertion means. In a weaving machine, the weft yarn existing upstream from the rotating yarn guide is discharged and removed from the main nozzle via the weft yarns connected to it while the weaving machine is stopped due to the weft yarn breakage between the yarn feeder and the rotating yarn guide. At this time, the rotating yarn guide is rotated so that the weft yarn existing upstream of the rotating yarn guide is once wound around the drum.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is premised on the existence of a drum type weft yarn accumulating device 1 as shown in FIG. This weft yarn storage device 1 includes, for example, two yarn feeders 2a, 2b
Pull out. The end of the one yarn feeder 2a on the pull-out side of the weft yarn 3 reaches the rotary yarn guide 6 through the inside of the guide tubes 4 and 5. The weft yarn 3 at the drawing-out end of the yarn supplying body 2a is connected to the drawing-out end of the other yarn supplying body 2b, and is held by the two clampers 7a and 7b between them and is also cut by the two cutters 8a and 8b. It is ready to be disconnected.

The guide tube 4 is inserted into a fixed guide tube 5 and is slidably combined so that the open end can be moved to an intermediate position between the clampers 7a and 7b by a driving cylinder 9. It has become. A photoelectric thread breakage sensor 44 is provided at the opening end.

A nozzle body 10 is provided in the middle of the guide tube 5. As shown in FIG. 2, the nozzle body 10 is provided with a plurality of nozzle holes 12 that are inclined in the weft insertion direction and a plurality of nozzle holes 13 that are inclined in the opposite direction in the central guide hole 11. These nozzle holes 12 and 13 are provided with pipes 14 and 15, on-off valves 16 and 17, and throttle valve 1, respectively.
It is connected to the pressurized air source 20 via 8 and 19.

As shown in FIG. 3 in addition to FIG. 1, the rotary yarn guide 6 winds the weft yarn 3 around the stationary storage drum 41 by a rotary motion. The locking and unwinding of the weft thread 3 on the storage drum 41 is performed by a locking pin 42 that is provided so as to be able to advance and retract from inside or outside of the storage drum 41.

The drive source of the locking pin 42 is composed of a cam mechanism or an electromagnetic coil which takes in a rotational force from the main shaft 26. Further, the weft thread 3 is stored in the storage drum 41.
It is guided to the main nozzle 43 as a weft insertion means.
A photoelectric yarn breakage sensor 45, for example, is provided between the storage drum 41 and the main nozzle 43.

As shown in FIG. 3, the end portion of the guide tube 5 is held by a support 21 screwed to a fixed frame 24, and is attached to the end surface of the thread guide hole 23 of the rotary shaft 22. It is rotatably inserted concentrically and closely. The rotary shaft 22 is rotatably supported by a bearing 25 with respect to the frame 24 and the like, and is driven from the main shaft 26 of the loom through a clutch 39 at an appropriate rotation ratio. Winding motor 2
7 can also be driven via the clutch 40.

An encoder 28 is connected to the rotary shaft 22 so that the rotary yarn guide 6 can always stop at a predetermined rotation angle. The control of the rotation and the stop angle of the preliminary winding motor 27 is performed by the control circuit 29.

As shown in FIG. 4, the threading device 30 includes a suction pipe 31, a first guide member 46 and a second guide member 47. The suction pipe 31 is
At the stop position of the rotary yarn guide 6, a trumpet-shaped suction port 32 is formed at a portion corresponding to the opening surface of the rotary yarn guide 6, and a rear end portion of the rotary yarn guide 6 is rotatably supported by a support shaft 48, and a vacuum pump or the like It is connected to the suction source 33. The length L of the suction pipe 31 is set to be equal to or greater than the distance from the storage drum 41 of the weft yarn storage device 1 to the main nozzle 43 for weft insertion.

Inside the suction pipe 31, a pair of clampers 34 is provided at an intermediate position, and a photoelectric sensor 35, for example, is provided at the rear end portion. The clamper 34 can be driven by, for example, a solenoid 36, and the output of the sensor 35 is connected to a lighting control circuit 37 for lighting a display lamp 38.

The first guide member 46 is attached to the tip of the piston rod 50 of the air cylinder 49, for example. The air cylinder 49 is attached to the side surface of the suction pipe 31 in this embodiment. The second guide member 47 is held by a guide 51 that is parallel to the center line of the main nozzle 43 and a slider 52 that is slidable in the axial direction with respect to the guide 51, and is located on the center line of the main nozzle 43. There is.

The second guide member 47 is a suction pipe 31.
Supports the cutter 56, and at the portion corresponding to the inlet side of the main nozzle 43 forms a recess 53 that opens at the upper and lower surfaces, and as shown in FIGS. 8 and 9, at the center position thereof. The pusher 54 is housed in the recess 53 so that it can be projected. The pusher 54 is driven by, for example, a solenoid 55 attached to the back side of the second guide member 47. A photoelectric sensor 57 and a cutter 58, for example, are provided at the tip of the main nozzle 43.

The weft thread 3 pulled out from the yarn feeder 2a is
As shown in FIG. 1, the guide tube 4 in the retracted position, the guide tube 5, the guide hole 11 of the nozzle body 10 and the thread guide hole 2 of the rotary shaft 22.
After passing through 3, it reaches the rotary yarn guide 6, goes out from there, and is wound around the outer peripheral surface of the storage drum 41.
When the locking pin 42 is projected on the outer peripheral surface of the storage drum 41, the weft thread 3 is locked to it, so that the rotary yarn guide 6 rotates to rotate the weft thread 3 in a number necessary for weft insertion. Are sequentially wound around the outer peripheral surface of the storage drum 41 in a stationary state. At this time, the weft thread 3 is locked by the locking pin 42, and the main nozzle 43 for weft insertion
Has reached.

When the locking pin 42 retracts, the weft thread 3 in the stored state is unwound on the outer peripheral surface of the storage drum 41. Therefore, the main nozzle 43 for weft insertion uses the weft thread 3 in the unwound state for weft insertion. With the above fluid, put it in the warp yarn opening.

Such a storing operation and a weft inserting operation are always performed in synchronization with the rotation of the main shaft 26 of the loom. During weaving, the on-off valve 16 is opened and an air flow opposite to the weft insertion direction is flown from the nozzle hole 13, so that an appropriate tension is applied to the weft thread 3 being drawn out. Of course, this tension can be set to an appropriate value by adjusting the throttle state of the throttle valve 18.

By the way, when the weft yarn 3 is cut between the yarn feeder 2a and the rotary yarn guide 6, the yarn breakage sensor 44 detects the yarn breakage state. Then loom stops at appropriate angles, the clutch 39 between the loom main shaft 26 and the rotary shaft 22 is disengaged, the clutch 40 is <br/> input is, rotating shaft 22 is driven by pre-winding motor 27 It This causes the rotating yarn guide 6 to rotate,
Cut weft thread 3 upstream of the storage drum 41
Is wound around the outer periphery of the storage drum 41. In this state
When the main nozzle 43 starts the injection operation, the storage drum
The weft thread 3 wound around the outer circumference of the 41 is the main nozzle 4
It is unwound by the jet flow of 3 and discharged from the main nozzle 43
To be done.

By the above operation, the weft 3 in the cut state
Is discharged by the jet flow through the guide pipes 4, 5, the storage drum 41 and the main nozzle 43, and is completely removed from them . This removed state can be confirmed by the yarn breakage sensor 45 between the storage drum 41 and the main nozzle 43.

Thereafter, as shown in FIG. 4, the rotary yarn guide 6 is stopped at a position facing the suction pipe 31. The suction source 33 of the suction pipe 31 operates, and the cylinder 9 moves the guide tube 4
Is moved to bring the open end close to the end of the weft yarn 3 of the new yarn feeder 2b, as shown in FIG. When the on-off valve 17 is turned on in this state and the pressurized air is jetted from the nozzle hole 12, an air flow in the suction direction is generated inside the guide tube 4. Here, when the cutter 8a cuts the weft thread 3 between the clampers 7a and 7b and the clamper 7b releases the weft thread 3, the end of the new weft thread 3 is drawn into the inside of the guide tube 4 and passes through the guide tube 5. , Is drawn into the rotary yarn guide 6, and is drawn from its tip into the suction pipe 31 facing the outside. When the weft thread 3 is sucked into the suction pipe 31 for a certain length, the pair of sensors 35 outputs an output to close the open / close valve 17.

After that, the clamper 34 holds the weft thread 3 inside the suction pipe 31, and the open / close valve 16 is turned on to apply an appropriate tension to the weft thread 3 between the clamper 34 and the yarn feeder 26. By rotating the rotary yarn guide 6, the encoder 28 detects the required number of windings 3 on the outer peripheral surface of the storage drum 41 so that the storage yarn 41 can be stored in advance. In this way, the threading operation from the yarn feeder 2b to the rotary yarn guide 6 is automatically performed.

On the other hand, the storage drum 41 of the weft storage device 1
When there is a weft yarn break between the main nozzle 43 for weft insertion, the yarn break sensor 45 detects it and
Stop the loom. After that, first, the rotary shaft 22 is separated from the main shaft 26 by the clutch 39, and instead, the pre-winding motor 27 gives reverse rotation to the rotary yarn guide 6 by coupling of the clutch 40, and guides the weft thread 3 remaining on the storage drum 41. The yarn feeder 2 is placed on the airflow from the on-off valve 16 flowing in the tubes 4 and 5 toward the yarn feeders 2a and 2b.
When the yarn is discharged to a suction device (not shown) on the side a, 2b, the yarn breakage sensor 44 outputs an output in the same procedure as the automatic weft threading when a weft yarn breaks between the yarn feeders 2a, 2b and the guide tubes 4, 5. , Threading work is automatically performed.

At this time, as shown in FIG. 4, the weft thread 3 enters the inside of the suction pipe 31 from the suction port 32 by the suction air flow at the tip portion of the rotary yarn guide 6. Inside the suction pipe 31, the weft thread 3 has a sensor 35
When it is detected, the lighting control circuit 37 lights the display lamp 38, so that the threading state can be visually confirmed from the outside.

Next, the solenoid 36 is turned on, and the pair of clampers 34 close the inside of the suction pipe 31 to hold the weft thread 3 inside. After that, the pre-winding motor 27 rotates again, and the rotary yarn guide 6 is given the necessary number of turns of rotation to wind the weft yarn 3 around the outer peripheral surface of the storage drum 41. At this time, regardless of whether the locking pin 42 is advanced or retracted, the weft thread 3
Is held by the pair of clampers 34 at one end and is wound around the outer peripheral surface of the storage drum 41. When the required number of preliminary windings is completed, the preliminary winding motor 27 operates the control circuit 29.
It is put under the control of and stops automatically. Such a series of operations includes weft breakage, encoder 28, sensor 3
This can be automatically performed by using a sequence circuit or the like with an output signal such as 5 as an input condition.

Thereafter, after the clamper 34 releases the weft thread 3, the suction pipe 31 is rotated around the support shaft 48 as shown in FIG.
Approach the entrance side of. Although not shown, the drive source of the suction pipe 31 is a pulse motor, an air cylinder, or the like. In this state, since the air cylinder 49 advances the piston rod 50, the first guide member 46 moves the storage drum 41 as shown in FIGS. 6 and 7.
The weft thread 3 between the suction pipe 31 and the suction pipe 31
The weft thread 3 between the first guide member 46 and the suction pipe 31 intersects the center line of the main nozzle 43, and the main nozzle 43 and the second guide member 47 are moved. Located in between.

After this, the second guide member 4
The slider 7 is guided by the slider 52 and approaches the inlet side of the main nozzle 43. Although not shown, the slider 52 is formed by, for example, an air cylinder or the like. In the process in which the second guide member 47 approaches the main nozzle 43, the weft thread 3 enters the inside of the recess 53 and moves to the inlet side of the main nozzle 43, as shown in FIG.

Subsequently, the solenoid 55 is operated and the pusher 54 is pressed against the inlet side of the main nozzle 43, so that the weft thread 3 faces the inlet side of the main nozzle 43 as shown in FIG. In this state, the cutter 56 is the weft thread 3
Is cut between the suction pipe 31 and the second guide member 47, so that the weft thread 3 can be drawn into the main nozzle 43. At this time, the main nozzle 4
3 generates a suction air flow, so weft 3 in the cut state
After being opened by the pusher 54, the first guide member 46 is returned to be drawn into the main nozzle 43 from the inlet side thereof.

In this way, the weft thread 3 has the main nozzle 4
After passing through 3, the suction pipe 31 and the second guide member 47 return to their original positions. The state of the weft thread 3 in the pulled state can be electrically detected by a pair of sensors 57 provided at the tip of the main nozzle 43. Then, at the tip of the main nozzle 43, the weft thread 3 is cut into a suitable length by a cutter 58. In this way, the loom is automatically set in a state in which it can be started.

In the above embodiment, the pusher 54 only releases the weft thread 3, but in the embodiment of FIG. 10, the weft thread 3 is positively ejected by injecting air from the nozzle hole 59 of the pusher 54. An example of pushing out into the inside of 43 is shown. That is, a plurality of nozzle holes 59 are provided in the pusher 54, and take in the pressure air from the pressure air source 60 and generate an air flow toward the inlet side of the main nozzle 43 when the weft thread 3 passes through.

Further, the second guide member 47 of the above embodiment.
Only restrains the weft thread 3 halfway and guides it near the main nozzle 43. However, the second guide member 47
As shown in FIG. 11, an air guide 6 having a nozzle function
4 and a clamper 61, and an air guide 64
Alternatively, the weft thread 3 sucked in (1) may be sandwiched by the clamper 61 and guided to the inlet side of the main nozzle 43.

[0032]

According to the present invention, the weft yarn, which is broken between the yarn supplying body and the rotating yarn guide, is wound around the storage drum.
Therefore , the main nozzle as the weft inserting means discharges and removes the weft yarn in the cut state, so that the removing operation can be automated.

The cut weft that is pulled out through the rotary yarn guide is bent and pulled out in the inside thereof, so that a large resistance is applied. In order to overcome this resistance, it is necessary to increase the ejection force of the main nozzle. However, if the jetting force is increased, yarn breakage easily occurs. In the present invention, since the weft yarn is pulled out from the rotary yarn guide by winding the weft yarn around the storage drum, the jetting force of the main nozzle does not have to be strong, and therefore the problem of yarn breakage can be solved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a drum type weft yarn storage device.

FIG. 2 is a sectional view of a nozzle body.

FIG. 3 is a sectional view of a main part of the weft yarn storage device.

FIG. 4 is a partial cross-sectional view of the weft threading device of the present invention seen from the side surface.

FIG. 5 is a plan view when threading the guide tube.

FIG. 6 is a side view during threading.

FIG. 7 is a side view during threading.

FIG. 8 is an operation explanatory diagram.

FIG. 9 is an operation explanatory diagram.

FIG. 10 is an operation explanatory diagram.

FIG. 11 is a partial plan view of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum type weft yarn accumulating device 2a, 2b Weft feeder 3 Weft yarn 6 Rotating yarn guide 27 Preliminary winding motor 30 Weft threading device 41 Storage drum 42 Locking pin 43 Main nozzle as weft inserting means 44 Thread break sensor 62 Weft yarn removing means Auxiliary pipe as

Claims (1)

[Claims] 1. A weaving machine in which a weft yarn fed from a yarn feeder is wound around a storage drum by a rotating yarn guide, and the weft yarn unwound by a locking pin is placed in a warp yarn opening by a weft inserting means. For weft thread breaks from the body to the rotating yarn guide
When the loom is stopped,
The existing weft thread is passed through the weft thread connected to it
Rotate the rotating yarn guide when discharging / removing from the sledge
Let the weft thread that is upstream of the rotating yarn guide
A method for removing a weft yarn in a cut state in a loom, wherein the weft yarn is once wound on a storage drum .