JP2018104857A - Main nozzle of air-jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the coaxiality of a brush holder with respect to a weft introduction pipe with a simple structure.SOLUTION: A main nozzle 11 of an air-jet loom includes a nozzle body 12, a weft introduction pipe 13 attached to the nozzle body 12, an acceleration tube 15 supported by the nozzle body 12 through a first holder 14, a weft capturing brush 16 provided between a weft introduction pipe 13 and the first holder 14, and a second holder 17 holding the brush 16 with the first holder 14. A part of the first holder 14 is contained in the nozzle body 12, the second holder 17 includes a passage forming portion 19 which forms a compressed air passage 19a between the outer peripheral surface 13c at a tip 13b of the weft introducing tube 13 on the upstream side.The first holder 14 and the second holder 17 are independently fixed to the nozzle body 12, and hold the brush 16 between the upstream side end 14c of the first holder 14 and the downstream side end 17 b of the second holder 17.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a main nozzle of an air jet loom, and more particularly to a main nozzle of an air jet loom having a function of capturing a weft after cutting.

  In an air jet loom, when wefts are subjected to a large tensile force due to compressed air during weft insertion, if the wefts are cut at the end of the weaving after the weft insertion, they may rebound and come out of the main nozzle. In particular, wefts called stretch yarns are highly stretchable and have the property of shrinking greatly at the same time as weft cutting. As a main nozzle of an air jet loom capable of reliably capturing a cut weft without obstructing the flow of compressed air, there is one provided with a weft capturing brush.

  As shown in FIG. 5A, in Patent Document 1, the main part of the main nozzle 51 is composed of a nozzle body 52 and a weft introduction pipe 53 attached to the nozzle body 52, a passage forming pipe 54, and an acceleration pipe 55. A proposal has been proposed in which a weft capturing brush 56 is disposed between a passage forming tube 54 and an acceleration tube 55.

  As shown in FIGS. 5A and 5B, the passage forming tube 54 has an upstream large diameter portion 54 a and a downstream small diameter portion 54 b, and the small diameter portion 54 b of the passage forming tube 54 has a first diameter portion. A cylindrical second holder 58 that fits and supports the holder 57 is fitted. The acceleration tube 55 is integrated with the first holder 57 by fitting a part of the upstream side to the first holder 57 and fixing it with an adhesive or the like.

  As shown in FIGS. 5A and 5B, the brush 56 includes a holding member 59 and a line material 60. The holding member 59 has an upstream-side small-diameter portion 59a and a downstream-side large-diameter portion 59b, and a compressed air flow hole 59c is formed at the center. The brush 56 is disposed on the downstream side of the passage forming tube 54, and the small diameter portion 59a of the holding member 59 is fitted into a concave portion 61 formed in an annular shape on the downstream end surface of the small diameter portion 54b of the passage forming tube 54. It is positioned. The small diameter portion 54 b of the passage forming tube 54, the large diameter portion 59 b of the holding member 59 of the brush 56, and the upstream end portion of the first holder 57 are fitted into a second holder 58 fitted into the nozzle body 52, Each unit is fixed by an adhesive and configured into a unit.

JP 2014-177725 A

  In the configuration of Patent Document 1, since the upstream end portion of the first holder 57 is fitted inside the second holder 58 fitted to the nozzle body 52, the first holder 57, the second holder 58, and Unless the fitting accuracy of each of the second holder 58 and the nozzle body 52 is strictly controlled, the coaxiality of the passage forming tube 54 with respect to the weft introduction tube 53 cannot be secured, and smooth compressed air in the compressed air passage can be secured. It is difficult to secure the flow.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a main nozzle of an air jet loom capable of ensuring the coaxiality of a brush holder with respect to a weft introduction pipe (thread guide) with a simple configuration. Is to provide.

  A main nozzle of an air jet loom that solves the above problems includes a nozzle body, a weft introduction pipe attached to the nozzle body, an acceleration pipe supported by the nozzle body via a first holder, and the weft introduction pipe And a weft capturing brush provided between the first holder and a second holder for sandwiching the brush with the first holder. The first holder is at least partially built in the nozzle body, and the second holder forms a compressed air passage between the upstream side and the outer peripheral surface of the distal end portion of the weft introduction pipe. A forming part is provided. The first holder and the second holder are independently fixed to the nozzle body, and the brush is sandwiched between the upstream end of the first holder and the downstream end of the second holder.

  According to this configuration, since the first holder and the second holder are independently fixed to the nozzle body, the first holder and the second holder are fixed to the nozzle body in a state in which the first holder and the second holder are respectively positioned. The holder and the second holder are fixed in a state where coaxiality is ensured. Further, the brush is held at a predetermined position by being sandwiched between the upstream end of the first holder and the downstream end of the second holder. Therefore, as compared with the configuration in which the second holder is fixed to the nozzle body in a state in which the first holder is fitted to the cylindrical second holder fitted to the small diameter portion of the passage forming tube as in the prior art. With this configuration, the coaxiality of the brush holder with respect to the weft introduction tube can be ensured.

  The first holder may include a large-diameter portion on the upstream side and a small-diameter portion on the downstream side, and the acceleration tube may be supported on the small-diameter portion. According to this configuration, since the downstream end of the large-diameter portion abuts the nozzle body, the first holder is fixed to the nozzle body, so that the first holder can be easily fixed at the target position. Can do.

  The first holder may be formed with the same diameter. According to this configuration, when removing the brush from the nozzle body, the first holder is removed from the nozzle body and the brush is taken out from the outlet side of the nozzle body. It is also possible to remove the brush. For this reason, the brush can be removed from the side where the removal work is easy to perform, and the workability is improved. In addition, it is easy to drill a hole formed in the nozzle body to accommodate the first holder and the second holder. Furthermore, if the first holder is removed from the nozzle body and the brush is taken out from the outlet side of the nozzle body, the brush can be replaced without removing the weft introduction pipe. Therefore, the position of the weft introduction pipe is adjusted each time the brush is replaced. There is no need to do it.

  The first holder and the second holder may be arranged in contact with each other. According to this configuration, since the position of the second holder does not change even if the brush is worn, the positional relationship between the weft introduction pipe and the second holder is kept constant.

  According to the present invention, the coaxiality of the brush holder with respect to the weft introduction tube can be ensured with a simple configuration.

Sectional drawing of the main nozzle of the air jet loom of one Embodiment. The perspective view of a brush. Sectional drawing of the main nozzle of the air jet loom of another embodiment. Sectional drawing of the main nozzle of the air jet loom of another embodiment. (A) is sectional drawing of the main nozzle of the air jet loom of a prior art, (b) is the partial expanded schematic sectional drawing which shows arrangement | positioning of a brush.

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 1 and 2. In the present specification, the description will be made assuming that the weft moving direction at the time of weft insertion is downstream (right side in FIG. 1) and the weft supply side is upstream (left side in FIG. 1) as necessary.

  As shown in FIG. 1, the main nozzle 11 includes a nozzle body 12, a weft introduction tube 13, a first holder 14, an acceleration tube 15, a weft capturing brush 16, and a second holder 17. Yes. The nozzle body 12 is formed with an accommodation hole 12 a for accommodating the first holder 14, the second holder 17, and the weft introduction tube 13. In the first holder 14, a part of the large diameter portion 14 a and the small diameter portion 14 b are built in the nozzle body 12. The accommodation hole 12a is formed in a shape that changes in two stages, with the downstream side becoming the small diameter portion 12b and the upstream side becoming the large diameter portion 12c.

  The weft introduction tube 13 is mounted on the upstream side of the nozzle body 12, a second holder 17 is disposed immediately downstream of the weft introduction tube 13, and the first holder 14 is sandwiched between the brush 16 and the second holder 17. It is provided on the downstream side. The acceleration tube 15 is supported by the nozzle body 12 via the first holder 14, and a brush 16 is provided in a compressed air flow path between the weft introduction tube 13 and the first holder 14. The nozzle body 12 is formed integrally with the main nozzle bracket 18. Further, on the upstream side of the weft introduction tube 13, a guide portion 13a that opens in a funnel shape and is made of a hard material such as ceramic is provided.

  The second holder 17 includes a passage forming portion 19 that forms a compressed air passage 19a between the distal end portion 13b of the weft introduction tube 13 and the outer peripheral surface 13c on the upstream side. The two holders 17 are loosely inserted into the passage forming portion 19. A male screw 20 is formed on the outer peripheral surface of the weft introduction tube 13, and the weft introduction tube 13 has a male screw 20 screwed into a female screw formed at the upstream end of the nozzle body 12 and a nut 21 screwed into the male screw 20. Is fastened to the nozzle body 12 with the tip of the weft introduction tube 13 positioned.

  As shown in FIG. 2, the brush 16 includes a holding member 22 having a small diameter portion 22 a and a large diameter portion 22 b, and a wire material 23 in which a proximal end is embedded in the large diameter portion 22 b of the holding member 22. Yes. The holding member 22 has a compressed air circulation hole 22c formed at the center thereof. The wire rod 23 is annularly arranged around the circulation hole 22c, and the tip end portion of the wire rod 23 is directed to the downstream side of the circulation hole 22c and is slightly tapered toward the center of the circulation hole 22c. It has been.

As shown in FIG. 1, the brush 16 is held by the second holder 17 in a state in which the holding member 22 is fitted in the recess 17 a formed at the downstream end of the second holder 17.
The first holder 14 and the second holder 17 are independently fixed to the nozzle body 12, and the brush 16 is attached to the upstream end 14 c of the first holder 14 and the downstream end 17 b of the second holder 17. The holding member 22 is clamped. The first holder 14 includes a large diameter portion 14a on the upstream side, and an acceleration tube 15 is supported by the small diameter portion 14b. The first holder 14 has a small-diameter portion 14b fitted with the small-diameter portion 12b of the nozzle body 12, a large-diameter portion 14a fitted with the large-diameter portion 12c of the nozzle body 12, and the upstream end of the large-diameter portion 14a is the nozzle body. In a state of being positioned in contact with the downstream end of the 12 large diameter portion 12 c, the nozzle body 12 is fixed to the nozzle body 12 by a hexagon socket head cap screw 24 that is screwed into a screw hole formed in the nozzle body 12. The second holder 17 is fixed to the nozzle body 12 by a hexagon socket head bolt 25 that is screwed into a screw hole formed in the nozzle body 12 in a state corresponding to the passage forming portion 19.

Next, the operation of the main nozzle 11 of the air jet loom configured as described above will be described.
Since the first holder 14 and the second holder 17 are independently fixed to the nozzle main body 12, the first holder 14 and the second holder 17 are fixed to the nozzle main body 12 in a state where the first holder 14 and the second holder 17 are respectively positioned. The holder 14 and the second holder 17 are fixed in a state where coaxiality is ensured. Further, the brush 16 is held at a predetermined position by being sandwiched between the upstream end 14 c of the first holder 14 and the downstream end 17 b of the second holder 17. Therefore, as compared with the configuration in which the second holder is fixed to the nozzle body in a state in which the first holder is fitted to the cylindrical second holder fitted to the small diameter portion of the passage forming tube as in the prior art. With this configuration, the coaxiality of the brush holder (the first holder 14 and the second holder 17) with respect to the weft introduction tube 13 can be ensured.

  During the operation of the air jet loom, when the weft insertion time comes, the compressed air is supplied to the main nozzle 11 by the switching operation of an opening / closing valve (not shown). 22c is injected. The weft yarn (not shown) introduced into the weft introduction tube 13 and positioned between the acceleration tubes 15 is injected from the opening on the downstream side of the acceleration tube 15 by the compressed air injected from the passage forming portion 19 and warps. It is inserted into an opening (not shown).

  When the weft insertion is completed, the weft on the main nozzle 11 side cut by a cutter (not shown) rebounds by the tensile force applied to the weft and is pulled back into the passage of the acceleration tube 15. In particular, in the case of a stretch yarn having a strong elasticity, a larger contraction effect is caused. The wefts contract while repeating meandering that is large enough to come into contact with the inner wall of the passage of the acceleration tube 15. Since the weft passes through the accelerating tube 15 and contracts while generating a large meander at the position where the brush 16 is disposed, the filament material 23 of the brush 16 uses the large meander of the weft to hook the weft and reliably Can be captured. Accordingly, the weft is pulled back by contraction and is stopped by the wire rod 23, and the tip of the weft stays in the passage of the acceleration tube 15.

  Subsequently, when weft insertion is started, the compressed air jetted from the passage forming portion 19 is captured by the line material 23 of the brush 16 and pulls the weft yarn existing in the acceleration tube 15 to achieve proper weft insertion. It can be performed.

  When the weft introduction tube 13, the first holder 14, the brush 16 and the second holder 17 are assembled to the nozzle body 12, first, the first holder 14 in which the acceleration tube 15 is integrated is first accommodated in the nozzle body 12. It inserts into the hole 12a from its upstream end. The first holder 14 is inserted until the downstream end of the large-diameter portion 14a of the first holder 14 comes into contact with the downstream end of the large-diameter portion 12c of the receiving hole 12a of the nozzle body 12, and the first hexagon socket head bolt 24 is used to The holder 14 is fixed to the nozzle body 12.

  Next, in a state where the holding member 22 of the brush 16 is fitted in the recess 17 a of the second holder 17, the second holder 17 is inserted into the accommodation hole 12 a of the nozzle body 12 from the line material 23 side. The second holder 17 is fixed to the nozzle body 12 with a hexagon socket bolt 25 with the second holder 17 inserted until the downstream end 17b of the second holder 17 contacts the upstream end 14c of the first holder 14. To do.

  Next, the weft introduction tube 13 is inserted into the accommodation hole 12a from the front end side, and the weft introduction tube 13 is rotated from the position where the male screw 20 of the weft introduction tube 13 is engaged with the female screw of the weft introduction tube 13 in a screwed state. After the insertion to a predetermined position, the nut 21 is fastened and fixed to the male screw 20 to complete the assembly of the weft introduction tube 13, the first holder 14, the brush 16 and the second holder 17.

  Since the brush 16 is a consumable item, it needs to be replaced. When replacing the brush 16, first, the nut 21 is loosened to release the fixing of the weft introduction tube 13 by the nut 21, and then the weft introduction tube 13 is rotated to release the threaded engagement between the male screw 20 and the female screw. The weft introduction tube 13 is extracted from the accommodation hole 12a. Next, after loosening the hexagon socket head bolts 24 and 25, the acceleration tube 15 is pushed toward the accommodation hole 12a until the second holder 17 is detached from the accommodation hole 12a or the second holder 17 is easily taken out from the accommodation hole 12a. Move to position.

  Then, after taking out the second holder 17 from the accommodation hole 12 a, the brush 16 is taken out from the concave portion 17 a of the second holder 17, and a new brush 16 is attached to the second holder 17. Next, the second holder 17 is pushed into the accommodation hole 12a of the nozzle body 12 from the brush 16 side. Then, with the large diameter portion 14a of the first holder 14 in contact with the downstream end of the large diameter portion 12c of the receiving hole 12a, the first holder 14 is fixed to the nozzle body 12 with the hexagon socket bolt 24, and the hexagon socket The second holder 17 is fixed to the nozzle body 12 with the attached bolt 25. Next, after the weft introduction tube 13 is inserted to a predetermined position in the accommodation hole 12a, the male screw 20 is screwed into the female screw of the accommodation hole 12a by a predetermined amount. Finally, the nut 21 is fastened to the male screw 20 to fix the weft introduction tube 13 at a predetermined position, whereby the brush 16 replacement operation is completed.

  In order for the weft insertion to be performed smoothly after the replacement of the brush 16, the positional relationship between the tip of the weft introduction tube 13 and the passage forming portion 19 formed in the second holder 17 is the same as before the replacement of the brush 16. Need to be. In this embodiment, the first holder 14 is fixed by the hexagon socket head cap bolt 24 in a state where the large diameter portion 14a is positioned in contact with the downstream end of the large diameter portion 12c of the accommodation hole 12a. Fixed to. And since the 2nd holder 17 is fixed with the hexagon socket head bolt 25 in the state which the downstream end contact | abutted to the upstream edge part 14c of the 1st holder 14, it is fixed to the same position. That is, the 1st holder 14 and the 2nd holder 17 are arrange | positioned in the state contact | abutted mutually. Accordingly, by fixing the weft introduction tube 13 at a predetermined position, even if the brush 16 is replaced, the positional relationship between the tip of the weft introduction tube 13 and the passage forming portion 19 is the same, and the weft insertion is smooth. To be done.

According to this embodiment, the following effects can be obtained.
(1) The main nozzle 11 of the air jet loom includes a nozzle body 12, a weft introduction pipe 13 attached to the nozzle body 12, an acceleration pipe 15 supported by the nozzle body 12 via a first holder 14, and a weft A weft capturing brush 16 provided in a flow path of compressed air between the introduction tube 13 and the first holder 14 and a second holder 17 for sandwiching the brush 16 with the first holder 14 are provided. The first holder 14 is at least partially incorporated in the nozzle body 12, and the second holder 17 has a compressed air passage 19 a between the distal end portion 13 b of the weft introduction pipe 13 and the outer peripheral surface 13 c on the upstream side. A passage forming portion 19 is provided. The first holder 14 and the second holder 17 are independently fixed to the nozzle body 12, and the brush 16 is sandwiched between the upstream end 14 c of the first holder 14 and the downstream end 17 b of the second holder 17. .

  According to this configuration, since the first holder 14 and the second holder 17 are independently fixed to the nozzle body 12, the first holder 14 and the second holder 17 are fixed while being positioned on the nozzle body 12. By doing so, the first holder 14 and the second holder 17 are fixed in a state where the coaxiality is ensured. Further, the brush 16 is held at a predetermined position by being sandwiched between the upstream end 14 c of the first holder 14 and the downstream end 17 b of the second holder 17. Therefore, as compared with the configuration in which the second holder is fixed to the nozzle body in a state in which the first holder is fitted to the cylindrical second holder fitted to the small diameter portion of the passage forming tube as in the prior art. With this configuration, the coaxiality of the brush holder with respect to the weft introduction tube can be ensured.

  Further, since at least a part of the first holder 14 is provided in the nozzle body 12, the first holder 14 is accelerated compared to a configuration in which the entire first holder is disposed outside the nozzle body as in Patent Document 1. The tube 15 can be lengthened, and the air flow disturbed by the brush 16 is rectified and ejected from the acceleration tube 15. Therefore, the weft flies in a stable posture.

  (2) The first holder 14 includes a large diameter portion 14a on the upstream side and a small diameter portion 14b on the downstream side, and the acceleration tube 15 is supported on the small diameter portion 14b. According to this configuration, the fixed position of the first holder 14 with respect to the nozzle body 12 is determined by the downstream end of the large-diameter portion 14a coming into contact with the nozzle body 12, so that the first holder 14 is brought to the target position. Can be fixed easily.

  (3) The first holder 14 and the second holder 17 are arranged so as to contact each other. According to this configuration, since the position of the second holder 17 does not change even when the brush 16 is worn, the positional relationship between the weft introduction pipe 13 and the second holder 17, that is, the position between the weft introduction pipe 13 and the passage forming portion 19. The relationship is kept constant and the airflow of compressed air is stabilized. Even when the second holder 17 is removed from the nozzle body 12 during the replacement work of the brush 16, when the second holder 17 is attached to the nozzle body 12, the second holder 17 is positioned at the same position as before the brush 16 is replaced. Easy to install.

  (4) The nozzle body 12 is formed integrally with the main nozzle bracket 18. The nozzle body 12 may be formed separately from the main nozzle bracket 18 and fixed to the main nozzle bracket 18 with screws or the like. However, since the nozzle body 12 is integrally formed, the attachment work to the loom body is simplified.

The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 3, the first holder 14 may have the same diameter and the same diameter as the second holder 17. In this case, when removing the brush 16 from the nozzle body 12, the first holder 14 is removed from the nozzle body 12 and the brush 16 is taken out from the outlet side of the nozzle body 12. It is also possible to remove the brush 16 from the inlet side of the main body 12. For this reason, the brush 16 can be removed from the direction where the removal work is easy to perform, and the workability is improved.

  Further, the accommodation hole 12a formed in the nozzle body 12 for accommodating the first holder 14 does not include the small diameter portion 12b and the large diameter portion 12c, and may have the same diameter, so that the drilling process is facilitated. Furthermore, if the first holder 14 is removed from the nozzle body 12 and the brush 16 is taken out from the outlet side of the nozzle body 12, the brush can be replaced without removing the weft introduction tube 13, so that each time the brush is replaced, the weft is introduced. There is no need to adjust the position of the tube 13. The removal of the brush 16 is performed, for example, by inserting a take-out tool provided with a latching portion that can be latched on the wire material 23 of the brush 16 from the downstream end of the nozzle body 12.

  As shown in FIG. 4, a male screw 30 is formed on the outer peripheral surface of the intermediate portion of the first holder 14, and a female screw 31 that is screwed with the male screw 30 is formed on the downstream end portion 17 b of the nozzle body 12. The first holder 14 may be fixed to the nozzle body 12 by screwing 30 and the female screw 31. The holding member 22 of the brush 16 is fastened and fixed at a predetermined position in contact with the upstream end portion 14 c of the first holder 14 and the downstream end of the second holder 17. In this case, first, the second holder 17 is fixed to the nozzle body 12 with the hexagon socket bolt 25 so that the passage forming portion 19 is in a predetermined position. In this state, the brush 16 is inserted into the accommodation hole 12a from the outlet side of the nozzle body 12, and the first holder 14 is screwed into the female screw 31 of the nozzle body 12, whereby the second holder 17, the brush 16, and the first holder. The positioning in the axial direction of 14 is reliably performed. Further, since the brush 16 can be replaced without removing the weft introduction tube 13, it is not necessary to adjust the position of the weft introduction tube 13 every time the brush is replaced.

As shown in FIG. 4, a step 32 may be provided on the second holder 17 so that the downstream end side of the second holder 17 has a small diameter portion. In this case, the second holder 17 can be easily positioned.
As shown in FIG. 4, only the small diameter portion 22 a of the holding member 22 of the brush 16 is fitted to the second holder 17, and the large diameter portion 22 b is fitted to the receiving hole 12 a of the nozzle body 12, and the second You may form in the state which the holder 17 and the holding member 22 fit.

In the embodiment shown in FIGS. 1 to 3, the large diameter portion 22 b of the holding member 22 of the brush 16 may be formed to have the same diameter as the upstream end portion 14 c of the first holder 14.
The nozzle body 12 may be formed separately from the main nozzle bracket 18.

The first holder 14 may be at least partially incorporated in the nozzle body 12, and the entire first holder 14 may be incorporated in the nozzle body 12.
A normal bolt may be used instead of the hexagon socket head bolt 24 that fixes the first holder 14 to the nozzle body 12.

  A normal bolt may be used instead of the hexagon socket head bolt 25 that fixes the second holder 17 to the nozzle body 12.

  DESCRIPTION OF SYMBOLS 11 ... Main nozzle, 12 ... Nozzle main body, 14b ... Small diameter part, 14a ... Large diameter part, 14c ... Upstream end part, 13 ... Weft introduction pipe | tube, 13b ... End part, 13c ... Outer peripheral surface, 14 ... 1st holder, DESCRIPTION OF SYMBOLS 15 ... Acceleration pipe | tube, 16 ... Brush, 17 ... 2nd holder, 17b ... Downstream side edge part, 19 ... Passage formation part, 19a ... Passage of compressed air.

Claims (4)

A nozzle body, a weft introduction pipe attached to the nozzle body, an acceleration pipe supported by the nozzle body via a first holder, and a weft provided between the weft introduction pipe and the first holder In a main nozzle of an air jet loom comprising a capturing brush and a second holder for sandwiching the brush with the first holder,
The first holder is at least partially built in the nozzle body, and the second holder forms a passage for compressed air between the upstream side and the outer peripheral surface of the distal end portion of the weft introduction pipe. The first holder and the second holder are independently fixed to the nozzle body, and the brush is sandwiched between the upstream end portion of the first holder and the downstream end portion of the second holder. A main nozzle of an air jet loom.   2. The main nozzle of the air jet loom according to claim 1, wherein the first holder includes a large-diameter portion on the upstream side and a small-diameter portion on the downstream side, and the acceleration pipe is supported on the small-diameter portion.   The main nozzle of the air jet loom according to claim 1, wherein the first holder is formed to have the same diameter.   The main nozzle of the air jet loom according to any one of claims 1 to 3, wherein the first holder and the second holder are arranged in contact with each other.

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