JP2000303315A - Apparatus for releasing holding of weft yarn in rapier loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce breakage or wearing out of a rapier head and an opener by providing a constitution in which the extent of contact of the opener for an operating part for releasing a yarn holding part in the rapier head is changed according to the yarn kind to be subjected to weft insertion. SOLUTION: This apparatus 1 for releasing the holding of a weft yarn comprises an opener 3 for coming into contact with an operating part 15 of a rapier head 6 and releasing a yarn holding part 7, a driving means 4 for moving the opener 3 toward a moving passage of the rapier head 6 and a controller 5 for driving the driving means 4 according to a selected weft yarn 8 in a rapier loom 2 for carrying out the multicolored weft insertion. The controller 5 is capable of driving the driving means 4 only by a proper extent according to the selected weft yarn 8 and the driving means 4 is capable of changing the contact position of the opener 3 with the operating part 15 for the moving passage of the rapier head 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft holding and releasing device for a rapier loom, and more particularly, to a contacting amount of an opener to an operating portion for releasing a yarn holding portion of a rapier head in accordance with the type of weft to be inserted. Means to do.

[0002]

2. Description of the Related Art A rapier head of a carrier rapier or a one-sided rapier loom is retracted to a standby position while holding a weft. The operating portion of the rapier head contacts the opener for releasing the yarn gripping portion and releases the weft in the retreating process after detachment from the warp opening. The opening amount of the yarn gripping portion is determined by the contact amount (interference amount) between the operation portion and the opener. This contact amount is determined by the position (distance) of the opener with respect to the moving path of the rapier head. When weft yarns with different counts (thickness) are used, usually the position of the opener is
The position is set in accordance with the thick yarn at a position where the opening amount is increased, that is, at a position close to the advance / retreat path of the rapier head. this is,
This is because, when the setting is made in accordance with a thin thread, a case where a thick thread cannot be completely removed occurs.

[0003] The contact force (interference force) applied between the operating portion and the opener when the operating portion contacts the opener and when the operating portion slides on the opener increases as the distance between the operating portion and the opener decreases. Conventionally, since the position of the opener is set in accordance with the thick yarn, the contact force applied to the rapier head and the operation unit during weft insertion is always large. For this reason, the rapier head and the opener are damaged or worn quickly, and require frequent maintenance and replacement.

[0004] Japanese Patent Application Laid-Open No. 1-111043 discloses that
A configuration is disclosed in which the position of the opener with respect to the reciprocating path of the rapier head can be changed. Japanese Unexamined Patent Publication No. 1-11
In the technique disclosed in Japanese Patent No. 1043, the position of the opener is changed according to the rotation speed of the loom, and is not changed according to the type of weft during weaving. Therefore, a problem similar to that of the above-described conventional technology occurs.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure in which the contact amount of an opener to an operating portion for releasing a yarn gripping portion of a rapier head is changed in accordance with a type of a weft-inserted yarn. It is to reduce.

[0006]

SUMMARY OF THE INVENTION In accordance with the above object, the present invention relates to a rapier loom for performing multi-color weft insertion, comprising a weft grasping and releasing device for opening a yarn grasping portion by contacting an operating portion of a rapier head. The drive unit moves the opener toward the moving path of the rapier head, and the control unit drives the drive unit in accordance with the selected weft.

The control device drives the driving means by an appropriate amount in accordance with the selected weft, and the driving means changes the contact position of the opener with respect to the moving path of the rapier head with the operating portion in accordance with the selected weft. I do.

[0008] In one embodiment, the single opener is displaceably provided toward the movement path of the rapier head,
The drive means, by an appropriate amount corresponding to the selected weft,
The opener is moved toward the movement path of the rapier head.

In another specific example, two or more openers are provided corresponding to the selected weft, and the drive means selectively selects the opener corresponding to the selected weft with the operating unit. Move to the contact position. Two or more openers
The opener holder is displaceably supported by the opener holder. When the opener is switched by the driving unit, the opener holder moves the driving unit and the two or more openers to the retracted position.

[0010]

FIG. 1 to FIG. 5 show a first concrete example. The weft grasping and releasing device 1 in the rapier loom of the present invention is incorporated in a rapier loom 2 that performs multicolor weft insertion, and includes an opener 3, a driving unit 4, and a control device 5.

As shown in FIGS. 1 and 2, the rapier head 6 of the rapier loom 2 holds the weft 8 selected by the yarn gripping portion 7 at the tip, and reciprocates the weft 8 in the weft insertion direction. The weft is inserted into the opening 11 formed by the catch cord 9 and the catch cord 10. The rapier head 6 is held by a rapier guide 12 so as to be able to reciprocate, and is driven by a rapier band 14 held by a band guide 13.

When the rapier head 6 grips the weft 8 and retreats to the standby position, the operating portion 15 of the rapier head 6 comes into contact with the opener 3 to release the yarn gripping portion 7, so that the rapier head 6 is in the standby position. Then, the weft 8 is released. After the weft 8 is released, the reed 16 drives the inserted weft 8 into the woven fabric 17 before weaving. The reed 16 is fixed to a sword 19 via a lead holder 18 together with the rapier guide 12 and the band guide 13, and performs a beating motion together with the locking shaft 20.

Here, the contact amount A between the opener 3 and the operation unit 15 is the amount of interference between the opener 3 and the operation unit 15 and determines the degree of opening of the yarn gripping unit 7. It must be set as an appropriate amount according to the thread type (count) of No. 8. In this example, the single opener 3 is rotatably supported at one end by an opener holder 21 and a fulcrum shaft 23, and the other end of the opener 3 that first comes into contact with the operation unit 15 has the opener 3. The output shaft 25 of, for example, a rotary solenoid as the driving means 4 is formed by the long hole 24.
And is supported by an eccentric shaft 26 formed at the center. As a result, the end of the opener 3 that first comes into contact with the operation unit 15 is supported so as to be displaceable toward the moving path of the rapier head 6.

The driving means 4 is not limited to a rotary solenoid, but can be constituted by a pulse motor, a servomotor or other rotary actuators, and is attached to the opener holder 22 by a bracket 27. These opener holders 21 and 22 are attached to a loom frame or the like (not shown).

As shown in FIGS. 1 and 5, the control device 5 is provided with a two-color weft selection signal Ya, Yb or a four-color weft selection signal Ya, Yb from a weft selection device 28 in a loom control device (not shown). , Yc, Yd and the stored current rotation angle of the output shaft 25, the rotation amount as the movement amount is calculated in accordance with the weft 8 selected by the rotation amount generator 29, and the driver 30 drives based on this. The means 4 is driven by an appropriate amount.

The driver 30 detects the amount of rotation of the driving means 4 detected by the encoder 31, and controls the amount of rotation under feedback control. The above memory
The arithmetic processing is performed by software by a microcomputer included in the rotation amount generator 29.

During weaving, the control device 5 activates the driving means 4 such as a rotary solenoid based on, for example, two-color weft selection signals Ya and Yb, and outputs a rotation amount corresponding to the selected weft 6. Drive means 4 such as a rotary solenoid
, The eccentric shaft 26 is rotated by a predetermined rotation amount, and the opener 3 is displaced to an optimum position toward the moving path of the rapier head 6.

With this control, the opener 3 and the operation unit 1
5 is adjusted, the operating unit 15 of the rapier head 6 displaces the yarn gripping unit 7 by an appropriate amount to release the selected weft 8, and moves the weft 8 to the standby position of the rapier head 6. Open with. Further, since the contact force when the operation unit 15 contacts the opener 3 is smaller than that when the operation unit 15 is set according to the thick yarn, the opener 3 and the rapier head 6
Damage and abrasion are reduced, and their durability is improved.

In the specific example shown, one of the openers 3 is used as a fulcrum shaft 23 and only the eccentric shaft 26 at the other end is rotated, but the fulcrum shaft 23 is also supported by the eccentric shaft 26 and the driving means 4. With this configuration, the opener 3 is displaced by the parallel movement. Also, instead of a rotary solenoid or a rotary actuator, a plurality of solenoids having different amounts of advance of pins (plungers) are
The opener 3 can be configured to move in parallel by selectively using these solenoids by connecting to the side surface of the opener 3.

The second embodiment shown in FIGS. 6 and 7 has a structure in which four openers 3a, 3b, 3c, and 3d are selectively used in accordance with selection of a weft 8 of two colors or more, for example, four colors. Things. The plurality of openers 3a, 3b, 3c, and 3d are configured to have a radial length corresponding to the type (count) of the weft 8 to be used. Are fixed by bolts 33. The support block 32 is rotatably supported on the opener holder 35 by bearings 34 at both ends at a position facing the rapier head 6. The support block 32 is connected to the output shaft 25 of the driving means 4 such as a rotary solenoid by a shaft coupling 36. Are linked.

The driving means 4 is fixed to the side surface of the opener holder 35 by a bracket 37 or the like.
The opener holder 35 is rotatably supported by an upper swing shaft 38 and a bearing 40 with respect to a bracket 39. The opener holder 35 is urged clockwise in FIG. At a predetermined timing, it is supported in a state in which the rocking motion can be performed.

In this example, the swing mechanism 42 includes a cam 43 synchronized with the main motion of the loom, a cam lever 45 driven by a cam roller 44 in contact with the contour of the cam 43, a lever shaft 46, one end of the cam lever 45 and an opener holder. It is composed of a connecting rod 47 for connecting the lens 35, a connecting pin 48, a spherical bearing 49 and the like. The swing mechanism 42 is provided to prevent interference or contact between the openers 3a, 3b, 3c, 3d and the rapier guide 12 when rotating and switching the plurality of openers 3a, 3b, 3c, 3d. Therefore, if there is no interference or contact,
This swing mechanism 42 can be omitted.

The control device 5 is constituted by the same one as in the first specific example. Weft selection signals Ya, Yb, Y
The driving means 4 such as a rotary solenoid is driven based on c and Yd, and the opener 3 a for the selected weft 8 is moved to a position where it comes into contact with the operating section 15 of the rapier head 6. Thereby, the opener 3 and the operation unit 15
Is changed according to the selected yarn type of the weft 8.

When the opener 3 is switched, the swing mechanism 42
Is moved to the retreat position by moving the opener holder 35 in the direction away from the rapier head 6. In this state, the drive unit 4 is driven by the control device 5 to move, for example, the opener 3 c corresponding to the selected weft 8 to a position where the opener 3 c contacts the operation unit 15 in accordance with the next selected weft 8. . At the completion of this switching operation, the swing mechanism 4
2 returns the opener holder 35 from the retracted position to a predetermined position, that is, a position where the selected opener 3c contacts the operation unit 15.

As shown in FIGS. 8 and 9, the plurality of openers 3a, 3b, 3c and 3d are attached to the mounting surface of the support block 32 via the elongated holes 50 and bolts 51. A configuration in which the attachment positions in the longitudinal direction of 3b, 3c, and 3d can be adjusted is also possible. Thereby, the openers 3a, 3b, 3c, 3
Since the contact start time of the operation unit 15 with respect to d can be adjusted, the opening timing of the yarn gripping unit 7 can be changed according to the yarn type.

[0026]

According to the present invention, when the opener and the operating portion of the rapier head are in contact with each other and slide, the contact force applied to both of them is adjusted to an appropriate state in accordance with the type of the weft inserted. For this reason, when a thin thread is selected, as compared with a conventional technique in which a large contact force is always applied, the opener is set at a position corresponding to the selected thread, and the contact force is reduced accordingly. Therefore, the opener and the rapier head have reduced damage, wear, and the like, and have improved durability. When the rapier head is at the most retracted position, even if the opener is displaced and comes into contact with the operation unit,
The contact reduces the contact force applied to the rapier head and improves the durability of the rapier head.

[Brief description of the drawings]

FIG. 1 is a plan view of a weft holding and releasing device in a rapier loom of a first specific example.

FIG. 2 is a side view of a weft holding and releasing device in the rapier loom of the first specific example.

FIG. 3 is a side view of a driving portion of the opener of the first specific example.

FIG. 4 is a side view of a drive portion of the opener of the first specific example.

FIG. 5 is a block diagram of a control device.

FIG. 6 is a front view of a weft holding and releasing device in a rapier loom of a second specific example.

FIG. 7 is a side view of a weft holding and releasing device in a rapier loom of a second specific example.

FIG. 8 is a front view of a mounting portion of a plurality of openers.

FIG. 9 is a side view of a mounting portion of a plurality of openers.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Weft grasping and releasing device in rapier loom 2 rapier loom 3, 3 a, 3 b, 3 c, 3 d opener 4 drive means 5 control device 6 rapier head 7 thread gripper 8 weft 9 warp 10 catch cord 11 opening 12 rapier guide 13 band guide 14 rapier band DESCRIPTION OF SYMBOLS 15 Operation part 16 Reed 17 Woven cloth 18 Lead holder 19 Slade 20 Locking shaft 21 Opener holder 22 Opener holder 23 Support shaft 24 Elongated hole 25 Output shaft 26 Eccentric shaft 27 Bracket 28 Weft selecting device 29 Rotation amount generator 30 Driver 31 Encoder 32 Support block 33 Bolt 34 Bearing 35 Opener holder 36 Shaft coupling 37 Bracket 38 Swing shaft 39 Bracket 40 Bearing 41 Tension spring 42 Swing mechanism 43 Cam 44 Cam roller 45 Cam Bar 46 lever shaft 47 coupling rod 48 connecting pin 49 spherical bearing 50 slots 51 bolt A contact amount Ya, Yb, Yc, Yd weft selection signal

Claims (4)

[Claims] In a rapier weaving machine for multi-weft weft insertion, an opener for abutting an operating portion of a rapier head to open a yarn gripping portion, a driving means for moving the opener toward a moving path of the rapier head, and The drive unit drives the drive unit by an appropriate amount in accordance with the selected weft, and the drive unit controls the opener operating portion with respect to the moving path of the rapier head. A weft holding and releasing device in a rapier loom, wherein a contact position is changed according to a selected weft. 2. The opener is provided so as to be displaceable toward the moving path of the rapier head, and the driving means moves the opener toward the moving path of the rapier head by an appropriate amount corresponding to the selected weft. The weft holding and releasing device in a rapier loom according to claim 1, wherein: 3. A plurality of openers are provided corresponding to the selected weft, and the driving means selectively moves the opener corresponding to the selected weft to a position in contact with the operation unit. The weft grasping and releasing device in a rapier loom according to claim 1, characterized in that: 4. The two or more openers are displaceably supported by an opener holder, and when the opener is switched by a driving unit, the opener holder moves the driving unit and the two or more openers to a retracted position. The weft holding and releasing device in a rapier loom according to claim 3, wherein: