JP2000336551A - Starting of loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a loom to a prescribed waiting state in the period for operation without threading so that a required treatment for a weft at a length-measuring part and storing part may be restarted at once to prepare for the finishing of the period for the operation without threading. SOLUTION: This starting method is the one for a loom 1 having a length-measuring and storing device 2 having a length-measuring part 7 for sending out a weft yarn 6 by bringing the weft yarn into contact with a pair of rollers 4, 5 synchronously rotating with a main shaft 3 of the loom 1, and a storing part 9 for storing the weft yarn 6 sent out from the length-measuring part 1 until the weft yarn 6 sent-out from the length-measuring part is inserted by the rotary motion of movable parts 8 and 39. When the loom 1 is started, the weft yarn 6 is kept so as not to contact with the roller 4 at the length-measuring part 7 rotating according to the rotation of a main shaft 3 to stop the sending out of the weft yarn 6 and to stop the storing of the weft yarn 6 while keeping the rotary motion of the movable parts 8, 39 of the storing part 9 in a step for beating without inserting the weft yarns for several picks just after the starting, and starting the insertion after passing the period of the operation without threading, and the length-measuring and storing device 2 is set to a waiting state by adding an adequate tension to the weft yarn 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loom equipped with a length measuring and storing device comprising a length measuring section and a storing section. In particular, the present invention relates to a method of setting the length measuring unit and the storage unit to a standby state during an idle shot period.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No. Sho 59-21751 discloses a method of starting a loom for eliminating a weaving step. In the starting method, a so-called idling state is set by performing idling without inserting weft until at least two rotations after starting. During the period during which weft insertion is not performed immediately after this start-up, the so-called idle driving period, the weft insertion nozzle is ejected, but in addition to the weft length measuring and storing device, a winding device, a sending device, etc., and a drive source for these devices When the connection to the main shaft of a certain loom is interrupted by a clutch, these devices are set in a state where they are not operated.

[0003] When the length measuring device is connected to the main shaft of the loom by engaging the clutch at the end of the idle driving period, an impact is applied to the length measuring device due to a sudden start, causing a problem in durability or a problem in the clutch. Slip occurs, the weft length becomes inaccurate, and furthermore, the weft becomes twisted due to looseness during the idle driving period, and the weft insertion nozzle causes clogging in the weft insertion nozzle, preventing the weft from being inserted. was there.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of starting a loom of a fluid jet type while beating without a weft during a few picks immediately after starting. By setting the length measuring unit and the storage unit to a predetermined standby state so that necessary processing for the weft can be immediately resumed in preparation for the end of the idling period, it is ensured that the weft is inserted even at the start of the subsequent weft insertion. Is to be able to enter.

[0005]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a loom starting method, wherein the weft is sent out by contacting a weft between a pair of rollers rotating in synchronization with a main shaft of the loom. A loom having a length measuring and storing device having a length measuring unit and a storage unit for storing the weft yarn until the weft sent out from the length measuring unit is inserted by the rotating motion of the movable unit; At the start of the beating, beating is performed without wefting during the idle period between several pick-ups immediately after startup, and in the process of starting weft insertion after the elapse of the idle period, the rotation of the spindle during the idle period Without contacting the weft with the rollers of the length measuring section that is rotating with the stop, the feed of the weft is stopped, and the rotation of the movable section of the storage section is continued, and the storage of the weft is stopped. Apply the appropriate tension and put the length measuring and storage device in standby mode. It is to be set to.

According to a second aspect of the present invention, in the length measuring unit according to the first aspect, one of the pair of rollers is rotated in synchronization with the main shaft of the loom, and the other driven roller is driven. The roller on the side is rotated in the same state as during length measurement during the idling period.

According to a third aspect of the present invention, in the loom starting method, the storage unit according to the first aspect includes a stationary drum for storing the weft, a yarn guide as a movable unit for winding the weft around the outer periphery of the stationary drum, and a stationary drum. An appropriate tension is applied to the weft by holding the pin at the unwinding position during the idle driving period and continuing the rotational movement of the yarn guide. ing.

According to a fourth aspect of the present invention, in the loom starting method, the storage section according to the first aspect is constituted by a rotating drum for storing weft yarns, and an airflow generating means for generating a swirling airflow around the outer periphery of the rotating drum. Appropriate tension is applied to the weft yarn by rotating a rotating drum as a movable part during the idling period and generating a swirling airflow on the outer periphery of the rotating drum by an airflow generating means.

The loom to be used is a fluid (water / air) jet loom, and is applicable not only to one-color weft insertion, but also to idle driving for multi-color weft insertion. At least one of the two rollers of the length measuring unit is driven in synchronization with the main shaft. The weft length measured by the length measuring unit measures one pick corresponding to one rotation of the main shaft of the loom, and is a type of measurement in which wefts for several picks are stored in the length measuring unit in advance. Long devices are not available in the method of the present invention.

The standby state of the length measuring section during the idling period may be any configuration in which the weft is not sent out. For example, two rollers of the length measuring section are separated from each other, or a driven roller that is not actively driven is driven. The roller may be stationary, but preferably the roller is preliminarily rotated at the peripheral speed during the steady operation. This preliminary rotation is advantageous in that no slip occurs between the pair of rollers at the start of length measurement, and damage to the weft such as filament breakage and weft cut does not occur.

In the standby state of the storage section during the idling period, an appropriate tension is set and applied so as not to entangle the weft. The standby state may be set to the same state as the normal operation, but preferably, it may be set as a weaker condition to reduce damage to the weft. Such setting can be set by changing the rotation speed of the yarn guide and changing the amount of airflow by the airflow generating means. In addition, the rotation direction of the yarn guide / rotating drum as a movable part in the storage part is preferably set to a direction in which torsion is added to the weft. By setting in this way, even with spun weft, the strength of the weft is not reduced and the quality of the fabric is maintained.

During the idling period, the holding means may be arranged so that the weft does not move upstream and downstream of the length measuring and storing device. If a sufficient holding force can be expected with the existing configuration, the holding means may be omitted. In order to prevent the weft from being pulled out from the yarn feeder, a blocking means (clamper / tenser) is arranged between the yarn feeder and the storage section, and a holding force is applied to the weft during the idle driving period. In order to prevent the weft from moving from the length measuring storage device to the weft insertion means (weft insertion nozzle),
A blocking means (clamper / tenser) is arranged between the length measuring storage device and the weft insertion nozzle, and a holding force is applied to the weft during the idling period. During the idle driving period, the pull-back force acts due to the storage, and the so-called nozzle missing, in which the leading end of the weft is drawn into the length measuring storage device, or when the injection of the weft insertion nozzle is performed, the weft present in the storage portion is removed. There are disadvantages of weft insertion, but these can be eliminated by the above-mentioned blocking means.

During the idling period, the length measuring section and the storage section are set in a standby state close to the time of steady weft insertion, so that the weft is not sent out, and the storage section has a desired tension applied state. Are held without entanglement with each other. After that, when the length measurement storage operation is started for steady weft insertion, the weft storage operation starts from the state where tension is applied to the weft, so that the looseness of the weft during the blanking period causes There is no entanglement or yarn jamming at the weft insertion nozzle when weft insertion is resumed, and no weft insertion error occurs, and weft insertion can be reliably continued even after the end of the idle driving period.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a concrete example in which a length measuring and storing device 2 is incorporated in a loom 1 such as a water jet loom. The length measuring / storing device 2 includes a length measuring section 7 for sending a weft 6 by bringing the weft 6 into contact with a pair of rollers 4 and 5 rotating in synchronization with the main shaft 3 of the loom 1, and a weft 6 sent from the length measuring section 7. Due to the rotational movement of the yarn guide 8 as a movable part,
It is constituted by a storage unit 9 of a stationary drum type that stores until the weft is inserted.

The weft yarn 6 is supplied from a yarn supplying body 10, passes between a pair of rollers 4, 5 via a guide 11, and a first clamper 12 as a blocking means, and reaches the inlet side of the storage section 9. ing. One roller 4 is used for length measurement, and the spindle 3
Pulley 13 and yarn guide 8 driven by
A second pulley 15 fixed to the shaft 23, a belt 14 such as a timing belt wound around the second pulley 15, and a pulley 16 of the roller 4 in contact with the belt 14 are driven.

The driven-side roller 5 is rotatably supported at the tip end of a lever 17 with respect to the drive-side length measuring roller 4, and has a fulcrum 18 of the lever 17 and a lever 17.
By a solenoid 19 attached to the proximal end of
The roller 4 is in a state of being able to contact and separate therefrom. When the driven side roller 5 is separated from the driving side length measuring roller 4, the driven side roller 5 comes into contact with the driving roller 20 and
Are driven to rotate by a motor 21 connected to the motor.

An elastic material, for example, urethane rubber is mounted on the outer peripheral surface of the driven roller 5 so as to increase the frictional contact between the roller 5 and the weft 6. When the roller 5 comes into contact with the roller 4, the elastic material is deformed by the pressing force, and comes into contact with the weft 6 in a deformed state. According to this specific example, the roller 5 is configured to be separated from the roller 4, and the weft 6 is applied to the length measuring roller 4 by its own tension.
Although it is configured to move to a position where it does not touch
A yarn guide for inserting the weft 6 is provided separately,
By changing the yarn path, the weft yarn 6 can be configured to actively separate from the pair of rollers 4 and 5.

FIGS. 2, 3 and 4 show the length measuring section 9 of the stationary drum type. The yarn guide 8 is rotatably supported inside the case 22 by a shaft 23 and a bearing 24, and rotates together with the yarn introduction tube 25 to convert the weft 6 measured by the length measuring unit 7 into the stationary drum 2.
6 to the outer peripheral surface. The outer diameters of the first pulley 13 and the second pulley 15 are determined so that the yarn guide 8 rotates n times with respect to one rotation of the main shaft 3. Where n
Is an integer of 2 or more. In this specific example, the stationary drum 2
6 is divided into four parts, and the bearing 2 is
8 supports the shaft 23 in a state where the rotation of the shaft 23 is allowed. The yarn guide 8 and the yarn guide tube 25
Is supported by the arm 29 with respect to the shaft 23. The holder 27 has a permanent magnet 30 at a predetermined position on the outer peripheral surface thereof. And the stationary drum 26 is set in a stationary (non-rotating) state.

The weft 6 wound around the stationary drum 26 is locked by a locking pin 33. The locking pin 33 locks the weft 6 by advancing into the groove 26 a of the stationary drum 26 by, for example, a solenoid 34, and retreats to the unwinding position at the weft insertion timing, thereby forming the outer periphery of the stationary drum 26. The weft 6 stored on the surface is unwound. Unwound weft 6
As shown in FIG. 1, the air reaches the inside of a weft insertion nozzle 37 via a guide 35 and a second clamper 36 as a blocking means. The weft insertion nozzle 37 is fixed at the weft insertion position by a nozzle holder 38.

Next, FIGS. 5 to 11 show the operation of the length measuring and storing device 2 from the start of idle driving of the loom 1 to the start of weft insertion. The angle in the figure is the main shaft 3 of the loom.
Represents the rotation angle of.

FIG. 5 shows a state in which the operation of the loom 1 is started. The rotation of the main shaft 3 of the loom 1 causes the length measuring roller 4 and the yarn guide 8 to operate in conjunction therewith.
Rotates in synchronization with the rotation of the main shaft 3. At this time, since the solenoid 19 drives the lever 17 to separate the driven roller 5 from the roller 4, the weft 6 is
It is not sent out in the direction of the storage unit 9. In this state,
If necessary, the first clamper 12 is in the closed state, so that the feeding of the weft yarn 6 is reliably prevented.
On the other hand, since the locking pin 33 is retracted to the unwinding position,
The weft 6 rotates around the stationary drum 26 with the rotation of the yarn guide 8. An appropriate tension is applied to the weft yarn 6 by the rotation of the yarn guide 8. During this time, the motor 21 drives the drive roller 20 and the roller 5
Is rotated at the set speed to prepare for the subsequent length measurement operation.

FIG. 6 shows an operation state from the time of the idle shot to the start of the preparation for the length measuring operation. During the idle driving period, the first clamper 12 and the second clamper 36 are closed, and the weft 6 is separated from the length measuring roller 4 and is not in contact therewith. It is not sent out to the storage unit 9. Therefore, in the storage section 9, the weft 6 continues to rotate around the outer circumference of the fixed drum 26 by the rotation of the yarn guide 8. Therefore, the desired tension is continuously applied to the weft yarn 6.

FIG. 7 shows a state in which the length measurement / storage operation is started after the lapse of the idling period. To start the length measurement operation, the solenoid 19 drives the lever 17 to bring the roller 5 into contact with the length measurement roller 4. This timing is accurately determined so as to coincide with the timing when the weft 6 guided by the yarn guide 8 is locked by the locking pin 33. The entry timing of the locking pin 33 may not be as accurate as described above, and is set so as to match the start timing of the storing operation. At the start of the length measuring operation, the first clamper 12
Is released, and this release time is also determined in consideration of the contact time between the weft 6 and the rollers 4 and 5. Since the driven roller 5 is driven and rotated by the motor 21 at a predetermined peripheral speed in the same state as at the time of length measurement, when the roller 5 comes into contact with the length measurement roller 4, Rollers 4, 5
Slip does not occur between the two, and troubles caused by the slip (damage to the weft 6 and occurrence of yarn breakage and length measurement error) can be prevented.

FIG. 8 shows the operation during the length measurement / storage operation. Weft yarn 6 sent out by rollers 4 and 5
Is wound around the outer periphery of the stationary drum 26 while being locked by the locking pin 33.

FIG. 9 shows a state at the start of weft insertion. At the time of weft insertion, the locking pin 33 is driven by the solenoid 34 to retreat and move to the unwinding position. At this time, the second
Is also in the open state. In such a state,
The weft insertion nozzle 37 injects a fluid to draw out the unwound yarn 6 from the outer periphery of the stationary drum 26 and inserts the weft into the opening. At this time, since the weft 6 is not restrained,
Fly through the opening in free flight.

FIG. 10 shows a state during weft insertion.
When the entire weft 6 is unwound on the outer peripheral surface of the stationary drum 26, the weft 6 is guided by the yarn guide 8,
While being restrained by, it becomes a state of restrained flight. At this time, the locking pin 33 advances to the locking position to prepare for the subsequent storing operation. In stationary weft insertion,
After the weft 6 is switched from free flight to restrained flight, the weft insertion is stabilized. The traveling speed of the weft 6 is reduced by the constrained flight. Due to this deceleration, when the weft 6 comes into contact with the locking pin 33, the weft 6 does not hit or flaw.

FIG. 11 shows a state in which the length measurement and storage operation of the next weft insertion pick is started after the weft insertion is completed. The length measuring unit 7 continuously sends out the weft 6. On the other hand, while the second clamper 36 is closed, the weft 6 orbiting around the stationary drum 26 is locked by the locking pin 33 in the storage section 9 due to the rotational movement of the yarn guide 8.
From this point on, the weft 6 is wound around the outer periphery of the stationary drum 26.

FIGS. 12 and 13 show a rotary drum type length measuring section 9 as an alternative to the stationary drum type length measuring section 9. The rotating drum type length measuring unit 9 includes the rotating drum 3
9, a cover 40 surrounding the outer periphery of the rotating drum 39 and an airflow generating means 41 such as a blower for generating a swirling airflow in a space formed between the outer periphery of the rotating drum 39 and the inside of the cover 40. Rotating drum 3
Numeral 9 rotates in synchronization with the rotation of the main shaft 3, and stores the measured weft yarn 6 at the outer peripheral position by a swirling airflow generated in the same direction as the rotation direction. The rotating drum 3
Reference numeral 9 denotes an outer peripheral portion, which contacts the length measuring roller 4 and rotates the rollers 4 and 5 to measure the length of the weft yarn 6 between the two rollers 5 and 4. Here, similarly to the above-described embodiment, the driven-side roller 5 is freely movable toward and away from the length-measuring-side roller 4, and is driven by the motor 21 and the driving roller 20 when the driven-side roller 5 is apart therefrom. It has become.

At the time of weft insertion, the second clamper 36 releases the weft 6, and at the same time, the weft insertion nozzle 37 injects the unwound weft 6 into the opening by injecting a fluid. At this time, the weft 6 stored in the outer peripheral portion of the rotating drum 39 is ejected from the weft insertion nozzle 37 by the jet fluid (water).
, Is unwound from the outer periphery of the rotating drum 39, and is sent out through the supply port 42 of the cover 40. In this specific example, the second clamper 36 disposed downstream of the storage section 9 is provided with a locking pin 3 in the storage section 9 of a stationary drum type.
The third function is performed. In addition, the airflow generating means 41 is a ridge formed in the axial direction on the outer periphery of the rotary drum 39.
Can also be configured.

[0030]

According to the present invention, the following effects can be obtained. According to the loom starting method of the first aspect, the weft is brought into contact with a pair of rollers rotating in synchronization with the main shaft of the loom, and the length measuring unit for sending out the weft, and the weft sent from the length measuring unit is sent to the movable unit. A storage unit for storing the weft yarn until the weft is inserted by the rotation motion, a weaving machine having a length measuring storage device having In the process of beating without inserting, and in the process of starting weft insertion after the elapse of the idle period, during the idle period, the weft is not brought into contact with the roller of the length measuring section rotating with the rotation of the main shaft Then, stop feeding of the weft, stop the weft storage while continuing the rotational movement of the movable part of the storage unit, apply an appropriate tension to the weft, and set the length measuring storage device to a standby state. I have to.

Therefore, during the idling period, the length measuring section and the storage section are set to a standby state close to the time of steady weft insertion. Thus, the weft yarn is not sent out, and is held in the storage portion without being entangled with each other in a desired tension applying state. For the subsequent steady weft insertion,
When the length measuring unit and the storage unit start the length measuring and storing operation, the weft storing operation starts from a state in which tension is applied to the weft, so that the wefts become entangled due to the looseness of the weft generated during the idle driving period. In addition, when the weft insertion is restarted, yarn jamming in the weft insertion nozzle does not occur and weft insertion error does not occur, and the weft insertion can be reliably continued even after the end of the idle driving period.

According to the second aspect of the present invention, in the length measuring section, one of the pair of rollers is rotated in synchronization with the main shaft of the loom, and the other driven roller is driven. Is rotated in the same state as during length measurement during the idling period, so this preliminary rotation does not cause a slip between a pair of rollers at the start of length measurement, causing filament weft breakage and weft breakage. This is advantageous because no damage occurs.

Further, according to the loom starting method of the third and fourth aspects, the movable portion (the yarn guide of the stationary drum type storage portion and the rotating drum of the rotary drum type storage portion) rotates during the idle driving period. Since the start of the storing operation immediately shifts after the end of the idle driving period, the storing operation of the weft by the storing unit can be reliably performed in preparation for the restart of the weft insertion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a length measuring storage device is incorporated in a water jet loom.

FIG. 2 is a sectional view of a stationary drum type storage unit.

FIG. 3 is a perspective view of a stationary drum.

FIG. 4 is an enlarged sectional view of a part of the drum.

FIG. 5 is an operation explanatory diagram when the operation of the loom is started.

FIG. 6 is an explanatory diagram of an operation from idling to the start of length measurement preparation.

FIG. 7 is an explanatory diagram of the operation at the start of the length measurement / storage operation.

FIG. 8 is an explanatory diagram of an operation during a length measurement / storage operation.

FIG. 9 is an explanatory diagram of an operation at the start of weft insertion.

FIG. 10 is an explanatory diagram of an operation during weft insertion.

FIG. 11 is an explanatory diagram of the operation from the end of weft insertion to the start of the length measurement and storage operation of the next pick.

FIG. 12 is a partially cutaway front view of a rotary drum type length measuring unit.

FIG. 13 is a sectional view of a rotary drum type length measuring unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loom 2 Length measuring storage device 3 Main shaft 4 Roller for length measurement 5 Follower roller 6 Weft 7 Length measuring section 8 Yarn guide 9 Storage section 10 Yarn 11 Guide 12 First clamper 13 as blocking means 13 First Pulley 14 belt 15 second pulley 16 pulley 17 lever 18 fulcrum 19 solenoid 20 drive roller 21 motor 22 case 23 shaft 24 bearing 25 yarn guide tube 26 stationary drum 26a groove 27 holder 28 bearing 29 arm 30 permanent magnet 31 permanent magnet 32 Cover 33 Locking pin 34 Solenoid 35 Guide 36 Second clamper as blocking means 37 Weft insertion nozzle 38 Nozzle holder 39 Rotary drum 40 Cover 41 Air flow generating means 42 Supply port

Claims (4)

[Claims] 1. A length measuring section for sending a weft by bringing a weft into contact between a pair of rollers rotating in synchronization with a main shaft of a loom, and inserting the weft fed from the length measuring section into the weft by rotating the movable section. A loom equipped with a length measuring storage device having a storage section for storing weft yarn until the beating operation is performed. In the process of starting weft insertion after the elapse of the idle driving period, during the idle driving period, the feeding of the weft is stopped without bringing the weft into contact with the rollers of the length measuring unit rotating with the rotation of the main shaft. A method of activating the loom, wherein the weft storage is stopped while continuing the rotational movement of the movable part of the storage part, and an appropriate tension is applied to the weft to set the length measuring storage device in a standby state. 2. A roller for length measurement of one of a pair of rollers is rotated in synchronization with a main shaft of a loom, and a roller on the other driven side is rotated during an idle driving period in the same state as at the time of length measurement. The loom starting method according to claim 1, wherein the loom is started. 3. A storage unit comprising: a stationary drum for storing a weft; a yarn guide as a movable unit for winding a weft around the outer periphery of the stationary drum; and a locking pin for locking the weft on the stationary drum. 3. An appropriate tension is applied to the weft by placing the locking pin at the unwinding position during the idle driving period and continuing the rotational movement of the yarn guide. The loom starting method described. 4. The storage section comprises a rotary drum for storing weft yarns, and an airflow generating means for generating a swirling airflow on the outer periphery of the rotary drum. 3. The loom starting method according to claim 1 or 2, wherein a suitable tension is applied to the weft by rotating and generating a swirling airflow on the outer periphery of the rotating drum by the airflow generating means.