JPH11107113A - Picking device in rapier loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picking device capable of extending the life of a rapier band. SOLUTION: A first position-controlling member 17 is disposed from an access boundary K1 to the side of a non-wrapping range H, and a second position-controlling member 18 is disposed at a place near to a boundary K2. A third position-controlling member 19 is disposed from the access boundary K1 to the side of a wrapping range E. The first position-controlling member 17 and the second position-controlling member 18 are provided with guide flat surfaces 171, 181 brought into contact with a rapier band 12 on the side of the non-wrapping range H. The third position-controlling member 19 is provided with a circular shape curved guide surface 191 brought into contact with the rapier band 12 on the side of the wrapping range E. The curved guide surface 191 is smoothly continued to the guide flat surface 171.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion device for a rapier loom.

[0002]

2. Description of the Related Art As disclosed in JP-A-3-180542, a weft insertion device in a rapier loom includes a rapier band to which a weft gripper (a rapier head in the present application) is fastened and a rapier wheel around which the rapier band is wound. There is a mechanism consisting of The rapier wheel around which a rigid and deformable rapier band is wound is reciprocated,
The weft gripper fixed to the rapier band advances into the warp shedding, and retreats from the warp shedding to insert the weft.

[0003] In this weft insertion device, the position of the rapier band is regulated by a shoulder block so as not to separate from the peripheral surface of the rapier wheel. The position regulation of the rapier band by the shoulder block is indispensable near the position where the rapier band is separated from the peripheral surface of the rapier wheel. The shoulder block has a flat plate shape, and the guide plane of the shoulder block is
Positioning the rapier band from the boundary between the wrapping range on the peripheral surface of the rapier wheel where the rapier band wraps and contacts and the non-wrapping range on the peripheral surface of the rapier wheel where the rapier band does not contact, along the linear movement path of the rapier band. I have.

[0004]

Since the rapier wheel reciprocates, the inertia of the weft gripper increases near the end of the retraction of the weft gripper from the warp opening. Further, the rapier band in the winding range floats from the peripheral surface of the rapier wheel due to centrifugal force. At the boundary between the winding range and the non-winding range, which is a transition portion from the linear movement path of the weft gripper and the rapier band to the arc path of the rapier band on the rapier wheel peripheral surface, the position of the rapier band is regulated by the shoulder block. Therefore, the engagement between the power transmission teeth and the power receiving holes at the boundary is firm. However, in the range where the rapier band rises from the peripheral surface of the rapier wheel, the engagement between the power transmission teeth and the power receiving holes is incomplete. Therefore, the inertial force concentrates on the meshing portion between the power transmission tooth and the power receiving hole near the boundary. Concentration of a large inertial force at the meshing portion between the power transmission teeth and the power receiving hole near the boundary shortens the damage of the power receiving hole and shortens the life of the rapier band.

[0005] It is an object of the present invention to extend the life of a rapier band.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a power transmission tooth of a rapier wheel which meshes with a power receiving hole of a rapier band which can be bent and deformed along a peripheral surface of the rapier wheel and elastically returns to a linear shape. In a rapier loom that wraps the rapier band around a rapier wheel, inserts the rapier head attached to the tip of the rapier band into the warp opening by reciprocating rotation of the rapier wheel, and retracts the weft from the warp opening to insert the weft. In the invention of claim 1, the rapier band on the rapier head side between a winding range where the rapier band is wound around the rapier wheel and a non-winding range where the rapier band is not wound around the rapier wheel. Linearly extends from the vicinity of the entrance to the rapier head to the rapier head. A first position regulating body having a guide plane in contact with the aband, a second position regulating body having a guide plane in contact with the rapier band near another boundary between the winding range and the non-winding range, and A weft insertion device comprising: a third position regulating body having a guide curved surface that extends along the peripheral surface of the rapier wheel in a part of the winding range from near the entrance / exit boundary and has a guide curved surface in contact with the rapier band. , The first position regulating body,
The position of the rapier band is regulated with respect to the peripheral surface of the rapier wheel by a second position regulating body and a third position regulating body.

[0007] The guide curved surface of the third position regulating body suppresses the lifting of the rapier band in the range from the entrance / exit boundary to the winding range, and the large inertial force of the rapier head does not concentrate on the power receiving hole in the specific range.

In the invention of claim 2, a rapier band containing carbon fiber as a reinforcing material is used. The carbon fiber reinforcing material is suitable for providing the bending rigidity necessary for quickly shifting the rapier band from the curved state to the linear state.

According to the third aspect of the present invention, the length of the guide curved surface of the third position regulating body is set to be not more than half of the winding range. When the guide curved surface extends over the entire winding range, the frictional resistance between the guide curved surface and the rapier band increases, and power consumption and heat generation become excessive. Excessive heat generation causes premature degradation of the rapier band. The configuration in which the length of the guide curved surface is set to be equal to or less than half of the winding range is suitable for avoiding power consumption and thermal deterioration.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 11 shown in FIG. 1 denotes a delivery rapier head inserted into the opening of the warp (not shown) from the weft insertion start side. The delivery rapier head 11 is fixed to the tip of a rapier band 12, and the rapier band 12 is wound around a rapier wheel 13. Rapier band 1
No. 2 contains carbon fiber as a reinforcing material.

A spindle 131 for supporting the rapier wheel 13
Is driven reciprocally in synchronization with the rotation of the loom, and the rapier wheel 13 reciprocates around the support shaft 131. A rapier band (not shown) is also wound around a reciprocatingly rotating rapier wheel (not shown) at the weft insertion end side. A receiving rapier head (not shown) is fixed to the tip of the rapier band. The transfer rapier head 11 and the receiving rapier head are inserted into the warp shed by the forward rotation of both rapier wheels, and the transfer rapier head 11 and the receiving rapier head meet at the center of the weaving width. The weft inserted into the warp shedding by the delivery rapier head 11 is delivered to the receiving rapier head. The return rapier head 11 and the receiving rapier head retreat from the warp shedding by the backward rotation of both rapier wheels, and the weft passes through the warp shedding.

Power transmission teeth 14 are arranged in a row on a peripheral surface of a rapier wheel 13 around which the rapier band 12 is wound.
Power receiving holes 15 are arranged in the rapier band 12. A rapier wheel 13 around which a rapier band 12 is wound
In the winding range E on the peripheral surface of the power transmission tooth 14, the power transmission tooth 14 meshes with the power receiving hole 15, and the reciprocating rotation of the rapier wheel 13 is transmitted to the rapier band 12 via the power transmission tooth 14 and the power receiving hole 15. The height of the power transmission teeth 14 is greater than the thickness of the rapier band 12.

The support shaft 131 is supported on the support plate 16, and fixed guides 28 and 29 are fixed to the support plate 16. Entry / exit boundary K on the side of the transfer rapier head 11 between the non-wrapping range H and the winding range E on the peripheral surface of the rapier wheel 13 where the rapier band 12 is not wound.
The rapier band 12 that has passed through 1 and is separated from the peripheral surface of the rapier wheel 13 is guided by a fixed guide 28. The rapier band 12, which has passed through another boundary K <b> 2 between the non-wrapping range H and the winding range E and is separated from the peripheral surface of the rapier wheel 13, is guided by the fixed guide 29.
The fixed guides 28 and 29 define a straight movement path of the rapier band 12.

A first position regulating body 17, a second position regulating body 18, and a third position regulating body 19 are fixed to the support plate 16. The first position restricting body 17 is disposed from the entrance / exit boundary K1 to the non-wrapping range H side, and the second position restricting body 18 is disposed from the winding range E to the non-wrapping range H on the boundary K2 side. I have. Third position regulating body 19
Is arranged from the entrance / exit boundary K1 to the winding range E side. First position regulating body 17 and second position regulating body 1
8 has guide planes 171 and 181 that contact the rapier band 12 on the non-wrapping range H side. The third position regulating body 19 is provided with an arcuate guide curved surface 191 that is in contact with the rapier band 12 on the winding range E side. The guide curved surface 191 smoothly continues to the guide plane 171. That is, the guide plane 171 is a tangent plane to the guide curved surface 191.

As shown in FIG. 2, the guide planes 171, 1
81 and the guide curved surface 191 have relief grooves 172, 182,
192 are formed. The tooth tips 141 of the power transmission teeth 14 protruding from the power receiving holes 15 of the rapier band 12 enter the relief grooves 172, 182, 192.

The portion of the rapier band 12 that is about to move away from the peripheral surface of the rapier wheel 13 tends to rise from the original linear movement path due to the elastic return force and the centrifugal force of the rapier band 12. The guide plane 171 linearly extends from the entrance / exit boundary K1 toward the delivery rapier head 11 and contacts the rapier band 12 to regulate the position of the rapier band 12 with respect to the peripheral surface of the rapier wheel 13. The guide plane 181 restricts the position of the rapier band 12 with respect to the peripheral surface of the rapier wheel 13 while contacting the rapier band 12 on the boundary K2 side. That is, the first position regulating body 17 and the second
The position regulating body 18 suppresses the lifting of the rapier band 12 moving away from the rapier wheel 13.

The guide curved surface 191 is curved from the entrance / exit boundary K1 along the peripheral surface of the rapier wheel 13 in a part of the winding range E, and contacts the rapier band 12 to move the rapier band 12 with respect to the peripheral surface of the rapier wheel 13. Position. The arc length of the guide curved surface 191 is set to about 1/4 of the winding range E.

In the winding range E between the third position regulating body 19 and the boundary K2, a limit switch type traveling position abnormality detector 20 is disposed. The detection needle 201 of the traveling position abnormality detector 20 is the rapier band 12 in the winding range E.
It is close to the travel route. Traveling position abnormality detector 20
Is turned on, this ON signal is sent to the controller 21. The controller 21 activates the alarm device 22 based on the input of the ON signal from the traveling position abnormality detector 20 and stops the operation of the loom drive motor M.

A similar mechanism is also provided on the support plate on the receiving rapier head side. In the first embodiment, the following effects can be obtained. (1-1) In the vicinity of the end of the evacuation of the delivery rapier head 11 from the warp shedding, the rotation speed of the rapier wheel 13 changes greatly, and the inertia force of the delivery rapier head 11 increases. Further, in the winding range E, the rapier band 12 tends to rise from the peripheral surface of the rapier wheel 13 due to centrifugal force. The guide curved surface 191 prevents the rapier band 12 from rising in the arc range E1 from the entrance / exit boundary K1 to the winding range E. The engagement between the power transmission teeth 14 and the power receiving holes 15 in the arc range E1 is firm, and the inertial force of the transfer rapier head 11 is at the engagement portion between the power transmission teeth 14 and the power reception holes 15 in the arc range E1. Distributed and accepted. Therefore, the large inertial force of the transfer rapier head 11 causes the power receiving hole 1 at a specific position to be high.
Therefore, the power receiving hole 15 is not easily damaged. As a result, the life of the rapier band 12 becomes longer. (1-2) The rapier band 12 that restores from the curved state to the linear state when moving from the winding range E of the rapier wheel 13 to the linear movement path needs strong bending rigidity. The carbon fiber reinforcing material is suitable for providing the bending rigidity necessary for quickly shifting the rapier band 12 from the curved state to the linear state. (1-3) When the guide curved surface 191 extends over the entire winding range E, the sliding contact area between the guide curved surface 191 and the rapier band 12 increases. Further, since there is no place for absorbing the bending deformation of the rapier band 12 in the winding range E, the frictional resistance between the guide curved surface 191 and the rapier band 12 becomes excessive. Therefore, power consumption becomes excessive, and heat is generated intensely. Excessive heat generation is rapier band 12
Accelerates thermal degradation of The configuration in which the arc length of the guide curved surface 191 is smaller than half the winding range E is power consumption,
This is suitable for avoiding the problem of thermal deterioration. (1-4) If the wear of the power receiving hole 15 increases, the rapier band 12 in the winding range E is more likely to float due to the centrifugal force. The traveling position abnormality detector 20 detects the rapier band 12 deviating from the original traveling route in the winding range E. Therefore, the rapier band 12 can be replaced before the power receiving hole 15 becomes worn and the rapier band 12 is damaged.

Next, a second embodiment of FIG. 3 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the third position regulating body 23 is provided with a guide curved surface 231 and a guide plane 232. The guide plane 232 is a tangent plane to the guide curved surface 231. The guide plane 232 guides the rapier band 12 raised from the peripheral surface of the rapier wheel 13 smoothly between the guide curved surface 231 and the peripheral surface of the rapier wheel 13.

Next, a second embodiment shown in FIG. 4 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the third position regulating body 19 is rotatably supported by the support shaft 24. A support block 25 is fixed to the support plate 16.
Is screwed with a position regulating screw 26. The head 261 of the position regulating screw 26 is configured to abut on the back of the third position regulating body 19. A lock nut 27 is screwed into the position regulating screw 26. The position regulating screw 26 is fixed to the support block 25 by tightening the lock nut 27. When the screw amount of the position regulating screw 26 into the support block 25 is reduced, the third position regulating body 19 is pushed in a direction approaching the peripheral surface of the rapier wheel 13. That is, fine adjustment can be performed so that the guide position of the guide curved surface 191 of the third position regulating body 19 becomes an appropriate position.

In the present invention, the first position regulating body 17 and the third
Embodiments in which the third position regulating body 19 is pressed against the rapier band 12 by a spring force are also possible.

The present invention can also be applied to a weft insertion device using a rapier band containing aramid fiber and glass fiber as a reinforcing material.

[0025]

As described above in detail, according to the present invention, the third surface of the rapier wheel extends from the vicinity of the entrance / exit boundary between the winding range and the non-winding range to a part of the winding range. Since the position of the rapier band is regulated by the position regulating body, there is an excellent effect that the life of the rapier band can be extended.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment.

FIG. 2 is a front view.

FIG. 3 is a sectional side view of a main part showing a second embodiment.

FIG. 4 is a side view of a main part showing a third embodiment.

[Explanation of symbols]

12 ... rapier band, 13 ... rapier wheel, 14 ... power transmission teeth, 15 ... power receiving hole, 17 ... first position regulating body, 171, 181 ... guide plane, 18 ... second position regulating body, 19, 23 ... Third position regulating body, 191, 231
… Guide curved surface.

Continuation of front page (72) Inventor Mitsuhiro Iwasaki 2-1-1, Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation

Claims (3)

[Claims] The rapier band is wound around the rapier wheel so as to engage the power transmission teeth of the rapier wheel with the power receiving holes of the rapier band which can be flexibly deformed and resiliently return to a linear shape along the peripheral surface of the rapier wheel. A rapier weaving device in a rapier loom that inserts the rapier head attached to the tip of the rapier band into the warp shedding by reciprocating rotation of the rapier wheel, and retracts the weft from the warp shedding to insert the weft. A guide that extends linearly to the rapier head side from the vicinity of the rapier band side of the rapier band on the rapier head side between the winding range where the rapier band is wound and the non-winding range where the rapier band is not wound on the rapier wheel, and a guide that contacts the rapier band. A first position regulating body having a plane, A second position restrictor having a guide plane contacting the rapier band near another boundary between the winding range and the non-winding range; and the rapier wheel in a part of the winding range from near the entrance / exit boundary. A third position restricting body having a guide curved surface that extends in a curved manner along the peripheral surface of the first position restricting member and contacts the rapier band; the first position restricting member, the second position restricting member, and the third position restricting member. A weft insertion device in a rapier loom, wherein the position of the rapier band is regulated with respect to the peripheral surface of the rapier wheel. 2. The weft insertion device in a rapier loom according to claim 1, wherein the rapier band includes carbon fiber as a reinforcing material. 3. The weft insertion device in a rapier loom according to claim 1, wherein the length of the guide curved surface of the third position regulating body is not more than half of the winding range.