Tension applying device of air jet loom

Abstract

Provided is a tension applying device capable of suppressing accumulation of flying catkins in a gap defined by a reed wire area. An air jet loom (100) is provided with a reed (10) and a tension applying device (30). The reed (10) is provided with a weft yarn guide passage and a plurality of gaps (10b). A passage part upper surface (31c) of the tension applying device (30) is provided with a stretching air exhaust port (31d) and a protruding part (50). The protrusion (50) is in contact with a reed wire (11) that defines a gap (10b) facing the stretched air outlet (31d), and expands the reed wire (11). Air with flying catkins is discharged from the stretching air outlet (31d). The protrusion (50) suppresses accumulation of flying catkins discharged from the stretched air outlet (31d) in the gap (10b) by enlarging the gap (10b).

Description

Technical Field

[0001] The present invention relates to a tension applying device for an air-jet loom. Background Art

[0002] Conventionally, an air-jet loom has a reed formed by arranging a plurality of reed blades in the weft insertion direction, and wefts are inserted along a weft yarn guiding passage provided in the reed. Each reed blade is arranged at equal intervals in the weft insertion direction. A gap is formed between each reed blade and an adjacent reed blade. Warp yarns pass through the gaps located within the weaving width.

[0003] The air-jet loom is provided with a tension applying device for applying tension to the wefts being inserted. The tension applying device suppresses the slack of the wefts by applying tension to the wefts running in the weft yarn guiding passage, thereby contributing to the weaving of high-quality fabrics. For example, the weft yarn tension applying device described in Patent Document 1 includes: a passage partitioning portion, i.e., the upper part of the mechanism, in which a weft yarn running passage is formed, and a lower part of the mechanism in which a stretching air passage is formed. An exhaust port, i.e., a vent hole, which opens on the upper surface of the weft yarn running passage, is formed in the upper part of the mechanism.

[0004] In addition, the weft yarn tension applying device described in Patent Document 1 includes: a blowing nozzle having a blowing jet port, and a stretching air jet port that jets air in a direction different from the direction along the weft yarn running passage. The blowing nozzle jets air in the direction along the weft yarn running passage to introduce the weft yarn into the weft yarn running passage and apply tension to the weft yarn. The stretching air jet port jets the air supplied from the stretching air passage onto the weft yarn introduced into the weft yarn running passage. After the air jetted from the stretching air jet port applies tension to the weft yarn in the weft yarn running passage, it is exhausted outside the upper part of the mechanism through the vent hole. The air exhausted from the vent hole passes through the gap located above the vent hole.

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-014545

[0006] There is a situation where fluff generated during weaving is exhausted outside the upper part of the mechanism together with the air exhausted from the vent hole via the weft yarn running passage and the vent hole. The fluff exhausted outside the upper part of the mechanism may accumulate in the gap located above the vent hole. Summary of the Invention

[0007] The tension applying device of a jet loom for solving the above problems is provided in a jet loom. In the above jet loom, weft insertion is performed on a weft yarn along a weft yarn guiding passage provided in a reed, and a plurality of reed blades are arranged in the weft insertion direction of the above weft yarn. A gap is demarcated between each of the above reed blades and the adjacent reed blade. The above tension applying device has a passage demarcating portion, and the above passage demarcating portion demarcates a weft yarn passage extending along the above weft yarn guiding passage. The above passage demarcating portion has: an upper surface which faces the upper wall of the above reed that demarcates the above weft yarn guiding passage; and an exhaust port which opens on the above upper surface and communicates with the above weft yarn passage. The above exhaust port faces at least one of the above gaps, sprays air toward the above weft yarn passage to apply tension to the above weft yarn, and discharges the above air from the above exhaust port. The gist of the tension applying device of the above jet loom is that a protrusion is provided in the above passage demarcating portion, and the above protrusion expands the above gap facing the above exhaust port by contacting the above reed blade.

[0008] Accordingly, the tension applying device sprays air into the weft yarn passage, and presses the weft yarn against the opening edge on the weft yarn passage side of the exhaust port. The tension applying device applies tension to the weft yarn by pressing the weft yarn against the opening edge of the exhaust port. Along with applying tension to the weft yarn, air is discharged from the exhaust port to the outside of the passage demarcating portion. The air discharged to the outside of the passage demarcating portion flows into the gap. The protrusion provided in the passage demarcating portion expands the gap facing the exhaust port by expanding the interval between the reed blades facing the exhaust port in the weft insertion direction. Thereby, it is possible to suppress the accumulation of flying fluff discharged from the exhaust port at the gap facing the exhaust port. As a result, the tension applying device of the jet loom can suppress the accumulation of flying fluff at the gap. According to the above content, the present invention can suppress the accumulation of flying fluff at the gap.

[0009] Alternatively, in the tension applying device of the above jet loom, the above protrusion is provided on the above upper surface.

[0010] Accordingly, the amount of expansion of the gap formed by the protrusion is the largest at the portion in contact with the protrusion due to the elastic deformation of the reed blade, and becomes smaller as it moves away from the protrusion in the direction along the reed blade. In other words, the distance from the exhaust port to the protrusion is likely to be smaller than the gap that expands more as it moves away in the direction along the reed blade. Therefore, by providing the protrusion in the same plane as the exhaust port, the tension applying device of the jet loom can expand the gap directly above the exhaust port to a desired width.

[0011] Alternatively, in the tension applying device of the above jet loom, the above reed has an inner wall, and the above inner wall demarcates the above weft yarn guiding passage in the front - rear direction orthogonal to the above weft insertion direction and the up - down direction respectively, and the above protrusion is provided between the above exhaust port and the above inner wall.

[0012] Accordingly, on the upper surface, the protrusion is disposed closer to the inner wall side than the exhaust port in the front-rear direction. In this case, the width of the gap enlarged by the protrusion is larger on the exhaust port side than the protrusion and smaller on the inner wall side than the protrusion. For example, by disposing the protrusion closer to the inner wall side than the exhaust port in the upper surface, the tension applying device of the air-jet loom can increase the width of the gap directly above the exhaust port as compared with the case where the protrusion is disposed on the side opposite to the inner wall than the exhaust port. As a result, the tension applying device of the air-jet loom can increase the width of the gap directly above the exhaust port by the protrusion.

[0013] Alternatively, in the tension applying device of the air-jet loom, the width in the weft insertion direction of the protrusion becomes smaller as it moves away from the exhaust port in the front-rear direction orthogonal to the weft insertion direction and the up-down direction, respectively.

[0014] Accordingly, when the passage partitioning portion is inserted into the weft yarn guiding passage, the passage partitioning portion is moved along the front-rear direction toward the reed. As it moves from the exhaust port toward the reed, the width of the protrusion in the weft insertion direction becomes smaller. Therefore, as the protrusion is inserted, the width of the gap for inserting the protrusion increases as the width in the weft insertion direction increases. Therefore, as compared with the case where the cross-sectional shape of the protrusion has a uniform width when viewed from the up-down direction, the tension applying device of the air-jet loom can easily insert the passage partitioning portion into the weft yarn guiding passage.

[0015] In addition, with the protrusion having the above-described configuration, the tension applying device can expand the width of the gap in stages and can insert the passage partitioning portion into the weft yarn guiding passage. As a result, the tension applying device of the air-jet loom can reduce the load applied to the reed and can expand the width of the gap by the protrusion.

[0016] Alternatively, in the tension applying device of the air-jet loom, the width in the weft insertion direction of the protrusion becomes smaller as it moves away from the upper surface in the up-down direction.

[0017] Accordingly, the width of the protrusion in the weft insertion direction has a shape in which the width in the weft insertion direction becomes smaller as it moves away from the upper surface of the passage partitioning portion in the up-down direction. Therefore, the width of the protrusion in the weft insertion direction is the largest on the upper surface side in the up-down direction, and the interval between the reed blades is expanded at the portion where the width is the largest. In other words, as compared with the case where the cross-sectional shape of the protrusion has a uniform width when viewed from the front-rear direction, the tension applying device can reduce the contact area between the protrusion and the reed blades. As a result, the tension applying device of the air-jet loom can reduce the load on the reed blades generated by the protrusion.

[0018] Alternatively, in the tension applying device of the air jet loom described above, the width of the protrusion in the weft insertion direction is equal to or less than the maximum dimension of the exhaust port in the weft insertion direction.

[0019] Accordingly, the width of the gap enlarged by the protrusion is equal to or less than the maximum dimension of the exhaust port in the weft insertion direction. The accumulation of lint that can affect the exhaust of air through the exhaust port occurs in the gap directly above the exhaust port. In other words, it is desirable that the width of the gap ensured by the protrusion corresponds to the maximum dimension of the exhaust port in the weft insertion direction. In addition, the width of the gap formed by the protrusion that exceeds this maximum dimension enlarges and imposes a load on each reed that has its interval enlarged by the protrusion. Therefore, in the tension applying device of the air jet loom, by making the width of the gap that the protrusion can enlarge equal to or less than the maximum dimension of the exhaust port, it is possible to suppress the load imposed on the reed that demarcates this gap and reduce the accumulation of lint in the gap.

[0020] According to the present invention, it is possible to suppress the accumulation of lint in the gap demarcated by the reed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view showing an air jet loom.

[0022] Figure 2 is an enlarged view showing a tension applying device and a reed.

[0023] Figure 3 is an enlarged view showing a tension applying device and a reed blade.

[0024] Figure 4 is a perspective view showing a tension applying device.

[0025] Figure 5 is an enlarged view showing a tension applying device.

[0026] Figure 6 is a schematic view showing the installation of a tension applying device to a reed.

[0027] Figure 7 is an enlarged view showing a tension applying device and a reed blade according to a modified example.

[0028] DESCRIPTION OF THE REFERENCE NUMERALS

[0029] 10...Shedding reed; 10a...Weft yarn guiding passage; 10b...Gap; 10c...Inner wall; 10d...Upper wall; 11...Shedding reed piece; 30...Tension applying device; 31...Passage dividing portion; 31a...Weft yarn passage; 31c...Upper surface of the passage portion as the upper surface; 31d...Stretching air exhaust port as the exhaust port; 50...Protrusion; 100...Air-jet loom; FB...Front-back direction; UD...Up-down direction; W...Weft insertion direction; Y...Weft yarn. Detailed implementation mode

[0030] Hereinafter, according to Figures 1 to 6 An embodiment in which the tension applying device of the air-jet loom is embodied will be described.

[0031] <Air-jet loom>

[0032] As Figure 1 shown, the air-jet loom 100 has a main nozzle M, a sub-nozzle S, a shedding reed 10, a reed base 20, and a tension applying device 30. A weft yarn guiding passage 10a for the weft yarn Y to pass through is provided on the shedding reed 10. The extending direction of the weft yarn guiding passage 10a is the same as the long side direction of the reed base 20. The main nozzle M inserts the weft yarn Y into the weft yarn guiding passage 10a. In other words, the air-jet loom 100 inserts the weft yarn Y along the weft yarn guiding passage 10a provided on the shedding reed 10. The weft yarn Y passes through in the long side direction of the reed base 20. The direction in which the weft yarn Y passes through is recorded as the weft insertion direction W. Hereinafter, the side where the main nozzle M is located in the weft insertion direction W is recorded as the "upstream" side, and the side opposite to the upstream in the weft insertion direction W is recorded as the "downstream" side.

[0033] After the air-jet loom 100 inserts the weft yarn Y, beating-up is performed by the shedding reed 10. When beating-up, the direction in which the shedding reed 10 moves is recorded as the front-back direction FB. The front-back direction FB is orthogonal to the weft insertion direction W. The direction orthogonal to the weft insertion direction W and the front-back direction FB is recorded as the up-down direction UD. The up-down direction UD coincides with the vertical direction.

[0034] In the air-jet loom 100, the shedding reed 10 and the weft yarn Y are arranged in the front-back direction FB. The air-jet loom 100 weaves a fabric C. In the front-back direction FB, the direction in which the fabric C is wound is recorded as the "front" side, and the opposite direction is recorded as the "rear" side.

[0035] <Main nozzle and sub-nozzle>

[0036] The main nozzle M is provided on the reed base 20. The main nozzle M is fixed to the upstream side of the reed base 20 in the weft insertion direction W. The main nozzle M inserts the weft yarn Y along the weft yarn guiding passage 10a. The main nozzle M is mounted on the reed base 20 in a manner that enables position adjustment in the weft insertion direction W.

[0037] The sub-nozzle S is fixed to the reed base 20. The sub-nozzle S jets air toward the weft yarn guiding passage 10a. The direction in which the air jets from the sub-nozzle S is along the weft insertion direction W. Moreover, the weft yarn Y travels in the weft yarn guiding passage 10a along the weft insertion direction W due to the air jet action formed by the main nozzle M and the sub-nozzle S.

[0038] <Reed>

[0039] The reed 10 has a plurality of reed blades 11 and a holding member 12. The holding member 12 holds the plurality of reed blades 11. The plurality of reed blades 11 are arranged in a row in the weft insertion direction W of the weft yarn Y. In other words, in the air-jet loom 100, a plurality of reed blades 11 are arranged in the weft insertion direction W of the weft yarn Y. A gap 10b is demarcated between the adjacent reed blades 11 in the weft insertion direction W. In other words, the reed 10 demarcates a gap 10b between each reed blade 11 and the adjacent reed blade 11. A plurality of gaps 10b are provided in the reed 10. The warp yarns T pass through the gaps 10b. However, the warp yarns T do not pass through the gap 10b at the position where the tension applying device 30 described below is provided. In the reed 10, the interval of each gap 10b is fixed except for the gap 10b into which the protrusion 50 shown in Figure 2 is inserted.

[0040] As Figure 1 、 Figure 3 shown, the reed blade 11 has a recess 13. The recess 13 is recessed from the front surface of the reed blade 11 toward the rear surface of the reed blade 11. The reed blade 11 has an inner edge 13a, an upper edge 13b, and a lower edge 13c. The recess 13 is demarcated by the inner edge 13a, the upper edge 13b, and the lower edge 13c. When viewed from the weft insertion direction W, the inner edge 13a is at the position that retreats the most from the front surface of the reed blade 11. The inner edge 13a extends in the up-down direction UD of the reed blade 11. The upper edge 13b extends from the upper end of the inner edge 13a toward the front surface. The upper edge 13b extends in the front-rear direction FB of the reed blade 11. The lower edge 13c extends from the lower end of the inner edge 13a toward the front surface. The lower edge 13c extends in the front-rear direction FB of the reed blade 11. In addition, the weft yarn guiding passage 10a is formed by arranging the recesses 13 of all the reed blades 11 in the weft insertion direction W.

[0041] The reed 10 has an inner wall 10c, an upper wall 10d, and a lower wall 10e. The inner wall 10c is the part where a plurality of inner edges 13a are arranged in the reed 10. Therefore, the inner wall 10c is formed by arranging a plurality of inner edges 13a along the weft insertion direction W. The upper wall 10d is the part where a plurality of upper edges 13b are arranged in the reed 10. Therefore, the upper wall 10d is formed by arranging a plurality of upper edges 13b along the weft insertion direction W. The lower wall 10e is the part where a plurality of lower edges 13c are arranged in the reed 10. Therefore, the lower wall 10e is formed by arranging a plurality of lower edges 13c in the weft insertion direction W. The weft yarn guiding passage 10a is delimited by the inner wall 10c, the upper wall 10d, and the lower wall 10e. In other words, the reed 10 has an inner wall 10c that delimits the weft yarn guiding passage 10a.

[0042] As Figure 1 shown, the warp yarns T pass through the gap 10b. The warp yarns T extend in the front-back direction FB. The air-jet loom 100 weaves the fabric C with the weft yarn Y and the warp yarns T. The woven fabric C extends forward of the air-jet loom 100. The selvage yarns T1 pass through the gap 10b at a position upstream of the tension applying device 30. The selvage yarns T1 and the weft yarn Y together form the waste selvage C1.

[0043] <Tension Applying Device>

[0044] The tension applying device 30 catches the end portion of the weft yarn Y and applies tension to the weft yarn Y. In addition, the tension applying device 30 suppresses the slack of the weft yarn Y by applying an appropriate tension to the weft yarn Y.

[0045] The tension applying devices 30 are arranged side by side on the front side of the reed 10. The tension applying device 30 is arranged at a position on the end portion side of the weft yarn Y that is drawn into the weft yarn guiding passage 10a and on the downstream side of the selvage yarn T1 of the waste selvage C1 in the weft insertion direction W.

[0046] The tension applying device 30 has a passage delimiting portion 31 and a supply portion 32. The tension applying device 30 is fixed to the reed base 20 by mounting the first end side of the supply portion 32 in the up-down direction UD to the reed base 20.

[0047] The passage delimiting portion 31 is in the shape of a long cylinder. The passage delimiting portion 31 is provided at the second end side of the supply portion 32 in the up-down direction UD. The passage delimiting portion 31 is arranged in the weft yarn guiding passage 10a. The passage delimiting portion 31 is housed in the weft yarn guiding passage 10a. The passage delimiting portion 31 straddles a plurality of reed blades 11.

[0048] As Figures 2 to 4As shown, the passage dividing section 31 has a passage section back surface 31e and a passage section upper surface 31c as the upper surface. The passage section back surface 31e is the surface of the outer surface of the passage dividing section 31 along the plurality of inner edges 13a. The passage section upper surface 31c is the surface of the outer surface of the passage dividing section 31 along the plurality of upper edges 13b. In other words, the passage dividing section 31 has a passage section upper surface 31c facing the upper wall 10d of the reed 10 that demarcates the weft yarn guiding passage 10a.

[0049] The passage dividing section 31 contacts the reed 10 at the passage section back surface 31e and the passage section upper surface 31c respectively. In other words, the tension applying device 30 contacts the plurality of reed blades 11 at the passage section back surface 31e and the passage section upper surface 31c respectively.

[0050] The passage dividing section 31 demarcates a weft yarn passage 31a. The weft yarn passage 31a extends along the weft insertion direction W. In other words, the passage dividing section 31 demarcates a weft yarn passage 31a extending along the weft yarn guiding passage 10a. The yarn inlet 30b of the weft yarn passage 31a opens at the upstream side of the passage dividing section 31 in the weft insertion direction W. The weft yarn Y is introduced into the weft yarn passage 31a from the yarn inlet 30b. The yarn outlet 30c of the weft yarn passage 31a opens at the downstream side of the passage dividing section 31 in the weft insertion direction W.

[0051] As Figure 1 and Figure 4 shown, the passage dividing section 31 has an air jetting section 34. A first air jetting port 34a is provided at the air jetting section 34. The first air jetting port 34a is connected to the first air supply pipe 41 and jets the air supplied by the first air supply pipe 41 into the weft yarn passage 31a.

[0052] The supply section 32 is located in front of the passage dividing section 31 in the front-back direction FB and below the passage dividing section 31 in the up-down direction UD. The supply section 32 is connected to the passage dividing section 31 at the upper end and is mounted on the reed base 20 at the lower end.

[0053] As Figure 4 shown, a stretching air passage 32a is demarcated in the supply section 32. The stretching air passage 32a extends in the up-down direction UD inside the supply section 32. The stretching air passage 32a is connected to the Figure 1 shown second air supply pipe 42 at the lower end and a second air jetting port 32b is formed at the upper end. As Figure 2 and Figure 4As shown, the second air jet port 32b opens toward the inside of the weft yarn passage 31a. In other words, the stretching air passage 32a communicates with the weft yarn passage 31a via the second air jet port 32b. Further, the stretching air passage 32a extends in a direction different from that of the weft yarn passage 31a, and the second air jet port 32b opens in a direction orthogonal to the extending direction of the weft yarn passage 31a.

[0054] As Figure 2 , Figure 3 and Figure 4 As shown, the passage partitioning portion 31 has a passage partitioning inner surface 31b that partitions the weft yarn passage 31a. The passage partitioning portion 31 has a stretching air exhaust port 31d that serves as an exhaust port. The stretching air exhaust port 31d opens at the passage partitioning inner surface 31b and the upper surface 31c of the passage portion. The stretching air exhaust port 31d is arranged side by side with the second air jet port 32b in the front-rear direction FB and is located above the stretching air exhaust port 31d in the up-down direction UD. The air jetted from the second air jet port 32b into the weft yarn passage 31a is discharged to the outside of the tension applying device 30 from the stretching air exhaust port 31d after passing through the weft yarn passage 31a. In other words, the passage partitioning portion 31 has a stretching air exhaust port 31d that opens at the upper surface 31c of the passage portion and communicates with the weft yarn passage 31a.

[0055] As Figure 1 As shown, the tension applying device 30 is provided on the front side of the reed 10. The tension applying device 30 is provided in the air-jet loom 100 in such a manner that the weft yarn passage 31a partitions a part of the weft yarn guiding passage 10a in the weft insertion direction W. The tension applying device 30 is provided in the air-jet loom 100 in such a manner that the upper surface 31c of the passage portion faces the upper wall 10d and the back surface 31e of the passage portion faces the inner wall 10c. The upper surface 31c of the passage portion is in contact with the upper wall 10d. Further, the back surface 31e of the passage portion is in contact with the inner wall 10c. In other words, the passage partitioning portion 31 is in contact with the reed 10 at the upper surface 31c of the passage portion and the back surface 31e of the passage portion, respectively.

[0056] As Figure 2 As shown, the stretching air exhaust port 31d faces a part of the upper wall 10d. In other words, the stretching air exhaust port 31d faces the upper side edges 13b of some of the reed blades 11 that constitute the reed 10. The stretching air exhaust port 31d faces the gaps 10b partitioned by each of the some reed blades 11. In other words, the stretching air exhaust port 31d faces at least one of the plurality of gaps 10b provided in the reed 10. The gap 10b facing the stretching air exhaust port 31d communicates with the weft yarn passage 31a via the stretching air exhaust port 31d.

[0057] <Protrusion>

[0058] As shown in Figure 2 , Figure 3 and Figure 4 , the tension applying device 30 has a protrusion 50. The protrusion 50 is provided on the upper surface 31c of the passage portion. The protrusion 50 is integrally formed with the passage partitioning portion 31. Alternatively, the protrusion 50 may be provided by being joined to the upper surface 31c of the passage portion after being separately manufactured from the passage partitioning portion 31.

[0059] As shown in Figure 4 and Figure 5 , the protrusion 50 has a longitudinal direction in the front - rear direction FB. The first end of the protrusion 50 in the longitudinal direction is the front end in the front - rear direction FB, and the second end of the protrusion 50 in the longitudinal direction is the rear end in the front - rear direction FB. The protrusion 50 has a shape in which the width in the weft - inserting direction W decreases from the first end to the second end in the longitudinal direction. In other words, from the second end to the first end in the longitudinal direction, the protrusion 50 expands the width in the weft - inserting direction W. In the protrusion 50, the protrusion front surface 51 and the protrusion rear surface 52 are provided as end faces in the longitudinal direction. The protrusion front surface 51 is the front end face in the front - rear direction FB, and the protrusion rear surface 52 is the rear end face in the front - rear direction FB. The protrusion front surface 51 and the protrusion rear surface 52 are respectively perpendicular to the upper surface 31c of the passage portion and continuous with the upper surface 31c of the passage portion.

[0060] The protrusion front surface 51 is arranged with respect to the protrusion rear surface 52 in the front - rear direction FB, and the width in the weft - inserting direction W is larger than that of the protrusion rear surface 52. In the front - rear direction FB, the width of the protrusion 50 in the weft - inserting direction W is the largest at the protrusion front surface 51 and the smallest at the protrusion rear surface 52. The width of the protrusion front surface 51 in the weft - inserting direction W is smaller than the aperture diameter of the stretching air exhaust port 31d. In other words, the width of the protrusion 50 in the weft - inserting direction W is equal to or less than the maximum dimension of the stretching air exhaust port 31d in the weft - inserting direction W.

[0061] The protrusion 50 is joined to the passage partitioning portion 31 at the first end which is the lower end in the up - down direction UD. The protrusion 50 has a protrusion end face 53 facing the same direction as the upper surface 31c of the passage portion at the second end which is the upper end in the up - down direction UD. In the up - down direction UD, from the first end to the second end, the width of the protrusion 50 in the weft - inserting direction W decreases in the weft - inserting direction W. In other words, the width of the protrusion end face 53 in the weft - inserting direction W is smaller than the width of the protrusion 50 on the side closer to the first end in the up - down direction UD in the weft - inserting direction W. In other words, the protrusion 50 decreases the width in the weft - inserting direction W as it moves away from the upper surface 31c of the passage portion in the up - down direction UD.

[0062] As shown Figure 5 in FIG. 1, the end face 53 of the protrusion portion has a flange portion 53a. A connecting surface 54 that connects the end face 53 of the protrusion portion to the upper surface 31c of the passage portion extends from portions of the flange portion 53a at both ends in the weft insertion direction W. The front surface 51 of the protrusion portion extends from a portion of the flange portion 53a at the front end in the front-back direction FB, and the rear surface 52 of the protrusion portion extends from a portion of the flange portion 53a at the rear end in the front-back direction FB. The connecting surface 54 is a surface on both sides in the weft insertion direction W of the outer surface of the protrusion portion 50. The connecting surface 54 is curved in such a manner that it depicts a gentle arc as it tends from the second end in the up-down direction UD toward the first end. The connecting surface 54 is connected to the front surface 51 of the protrusion portion and the rear surface 52 of the protrusion portion in the front-back direction FB, respectively. In other words, the outer surface of the protrusion portion 50 is constituted by the front surface 51 of the protrusion portion, the rear surface 52 of the protrusion portion, the end face 53 of the protrusion portion, and the connecting surface 54.

[0063] As shown Figure 3 in FIG. 2, the protrusion portion 50 is located at a position on the upper surface 31c of the passage portion that is arranged side by side with the drawing air exhaust port 31d in the front-back direction FB and is closer to the inner wall 10c side of the reed 10 than the drawing air exhaust port 31d. The protrusion portion 50 is provided at a position that is between the drawing air exhaust port 31d and the inner wall 10c in the front-back direction FB. As shown Figure 5 in FIG. 3, the protrusion portion 50 is in a position where the front surface 51 of the protrusion portion and the opening edge of the drawing air exhaust port 31d are arranged in the front-back direction FB with the upper surface 31c of the passage portion interposed therebetween on the upper surface 31c of the passage portion. The front surface 51 of the protrusion portion is connected to the inner peripheral surface that demarcates the drawing air exhaust port 31d in the front-back direction FB via the upper surface 31c of the passage portion.

[0064] As shown Figure 6 in FIG. 4, the width of the front surface 51 of the protrusion portion in the weft insertion direction W is greater than the width of the gap 10b. In addition, the width of the rear surface 52 of the protrusion portion in the weft insertion direction W is smaller than the width of the gap 10b. In other words, the protrusion portion 50 is larger than the width of the gap 10b at the front surface 51 of the protrusion portion and smaller than the width of the gap 10b at the rear surface 52 of the protrusion portion. In other words, as it moves away from the drawing air exhaust port 31d in the front-back direction FB, the protrusion portion 50 reduces the width in the weft insertion direction W.

[0065] As shown Figure 2As shown, the protrusion 50 contacts the two reed blades 11 at the side of the upper surface 31c of the passage portion of the connection surface 54, and expands the width in the weft insertion direction W of the gap 10b delimited by each of the reed blades 11. For the gap 10b delimited by the reed blade 11 contacted by the protrusion 50 among the multiple gaps 10b provided in the reed 10, the width in the weft insertion direction W is larger than that of the other gaps 10b. The width of the expanded gap 10b is defined by the width of the front surface 51 of the protrusion in the weft insertion direction W. In other words, a protrusion 50 is provided on the passage division portion 31 that expands the gap 10b facing the drawing air exhaust port 31d by contacting the reed blade 11.

[0066] <Insertion of the Tension Application Device into the Weft Yarn Guide Passage>

[0067] The tension application device 30 is provided in the air-jet loom 100 by inserting the passage division portion 31 into the weft yarn guide passage 10a from the front of the reed 10. Figure 6 The double-dashed line of shows the tension application device 30 before being installed on the reed 10, and Figure 6 the solid line of shows the tension application device 30 that has been installed on the reed 10. During the process of installing the tension application device 30 on the air-jet loom 100, the protrusion 50 moves from the position where the rear surface 52 of the protrusion faces the gap 10b in the front-back direction FB to the position where the protrusion 50 contacts the reed blade 11 delimiting the gap 10b. During this movement, the protrusion 50 contacts the reed blade 11 at the connection surface 54 after the rear surface 52 of the protrusion is inserted into the gap 10b. From the rear surface 52 of the protrusion towards the front surface 51 of the protrusion, the width of the protrusion 50 in the weft insertion direction W at the pair of connection surfaces 54 becomes larger. In other words, during the process of the protrusion 50 being inserted into the gap 10b, the width of the gap 10b delimited by the reed blade 11 contacting the protrusion 50 expands together with the expansion of the width of the protrusion 50 in the weft insertion direction W. For the width of the gap 10b into which the protrusion 50 is inserted, the side of the front surface 51 of the protrusion is larger than the side of the rear surface 52 of the protrusion.

[0068] As Figure 3 、 Figure 6 shown, the tension application device 30 is inserted into the reed 10 until the drawing air exhaust port 31d faces the gap 10b expanded by the protrusion 50 and the back surface 31e of the passage portion contacts the inner wall 10c. The drawing air exhaust port 31d is located on the side of the front surface 51 of the protrusion of the protrusion 50 in the front-back direction FB, and is arranged side by side with the reed blade 11 in the up-down direction UD. The tension application device 30 maintains the contact between the upper surface 31c of the passage portion and the upper wall 10d in the up-down direction UD, and inserts the passage division portion 31 into the weft yarn guide passage 10a.

[0069] <Applying Tension to the Weft Yarn by the Tension Applying Device>

[0070] As Figure 1 shown, when inserting the weft yarn Y in the air-jet loom 100, the weft yarn Y travels through the weft yarn guiding path 10a by the jet of air from the main nozzle M and the sub-nozzle S. The weft yarn Y travels from the upstream side to the downstream side of the air flow from the main nozzle M in the weft insertion direction W. After the weft yarn Y travels to the position of the side yarn T1, it is introduced from the yarn inlet 30b into the weft yarn traveling path 31a demarcated by the path demarcation section 31.

[0071] When introducing the weft yarn Y into the yarn inlet 30b, air is supplied to the air jet section 34 from an air supply source (not shown) via the first air supply pipe 41. The air jet section 34 jets air into the weft yarn traveling path 31a through the first air jet port 34a. The jet of air formed by the air jet section 34 into the weft yarn traveling path 31a captures the weft yarn Y and applies tension to the weft yarn Y. In other words, the tension applying device 30 of the air-jet loom 100 jets air toward the weft yarn traveling path 31a to apply tension to the weft yarn Y and discharges air from the stretched air exhaust port 31d.

[0072] After the weft yarn Y passes through the weft yarn traveling path 31a, it exits from the yarn outlet 30c to the outside of the tension applying device 30. After the weft yarn Y is introduced into the yarn outlet 30c, air is supplied to the stretched air passage 32a from an air supply source (not shown) via the second air supply pipe 42. In other words, the supply section 32 is supplied with air through the second air supply pipe 42. The supply section 32 jets the air supplied from the second air supply pipe 42 into the weft yarn traveling path 31a through the stretched air passage 32a via the second air jet port 32b. The air jetted from the second air jet port 32b is discharged from the stretched air exhaust port 31d to the outside of the weft yarn traveling path 31a after crossing the weft yarn traveling path 31a through which the weft yarn Y travels. In other words, the air jetted from the second air jet port 32b is discharged from the stretched air exhaust port 31d after passing through the weft yarn Y.

[0073] When discharging air from the stretched air exhaust port 31d, the air near the stretched air exhaust port 31d inside the weft yarn traveling path 31a flows into the stretched air exhaust port 31d. The flow direction of the air formed by this inflow is the up-down direction UD and is orthogonal to the extending direction of the weft yarn traveling path 31a. In other words, the weft yarn Y traveling in the weft yarn traveling path 31a is pressed against the opening edge on the weft yarn traveling path 31a side of the stretched air exhaust port 31d by the air discharged from the stretched air exhaust port 31d. Tension in the weft insertion direction W is applied to the weft yarn Y by this pressing.

[0074] The air discharged from the drawing air exhaust port 31d flows into the gap 10b opposed to the drawing air exhaust port 31d.

[0075] [Function of the present embodiment]

[0076] The function of the present embodiment will be described.

[0077] During the weaving process of the air-jet loom 100, fluff is generated from the weft yarn Y. The fluff generated from the weft yarn Y is discharged together with air from the drawing air exhaust port 31d toward the reed 10. The air discharged from the drawing air exhaust port 31d flows into the gap 10b opposed to the drawing air exhaust port 31d. The gap 10b into which the air flows is demarcated by the reed blade 11 in contact with the protrusion 50. In other words, the air discharged from the drawing air exhaust port 31d flows into the gap 10b whose width in the weft insertion direction W is enlarged due to the protrusion 50.

[0078] [Effect of the present embodiment]

[0079] The effect of the present embodiment will be described.

[0080] (1) The air discharged from the drawing air exhaust port 31d to the outside of the passage demarcation portion 31 flows into the gap 10b opposed to the drawing air exhaust port 31d. The protrusion 50 provided on the upper surface 31c of the passage portion enlarges the width of the gap 10b in the weft insertion direction W. Thereby, it is possible to suppress the accumulation of fluff formed together with the air discharged from the drawing air exhaust port 31d at the gap 10b opposed to the drawing air exhaust port 31d. As a result, the tension applying device 30 of the air-jet loom 100 can suppress the accumulation of fluff at the gap 10b.

[0081] (2) The amount of enlargement of the gap 10b formed by the protrusion 50 is the largest at the portion in contact with the protrusion 50 due to the elastic deformation of the reed blade 11. Moreover, the amount of enlargement of the gap 10b formed by the protrusion 50 becomes smaller as it moves away from the protrusion 50 in the front-back direction FB and the up-down direction UD. In other words, the farther the distance from the drawing air exhaust port 31d to the protrusion 50 is in the front-back direction FB and the up-down direction UD, the more likely the width of the gap 10b is to be smaller than the desired width. Therefore, the tension applying device 30 of the air-jet loom 100 can enlarge the gap 10b directly above the drawing air exhaust port 31d to the desired width by providing the protrusion 50 and the drawing air exhaust port 31d together on the upper surface 31c of the passage portion.

[0082] (3) At the upper surface 31c of the passage portion, the protruding portion 50 is provided closer to the inner wall 10c side than the stretching air exhaust port 31d in the front-back direction FB. In this case, the width of the gap 10b enlarged by the protruding portion 50 is larger on the side closer to the stretching air exhaust port 31d than the protruding portion 50 and smaller on the side closer to the inner wall 10c than the protruding portion 50. For example, compared with the case where the protruding portion 50 is provided in front of the stretching air exhaust port 31d, the width of the gap 10b directly above the stretching air exhaust port 31d can be increased. As a result, the tension applying device 30 of the air-jet loom 100 can increase the width of the gap 10b directly above the stretching air exhaust port 31d through the protruding portion 50.

[0083] (4) When the passage partitioning portion 31 is inserted into the weft yarn guiding passage 10a, the width of the gap 10b for inserting the protruding portion 50 becomes larger as the width of the protruding portion 50 in the weft insertion direction W increases. Therefore, compared with the case where the cross-sectional shape of the protruding portion 50 has a uniform width when viewed from the up-down direction UD, the tension applying device 30 of the air-jet loom 100 can easily insert the passage partitioning portion 31 into the weft yarn guiding passage 10a.

[0084] In addition, since the protruding portion 50 has the above-described configuration, the tension applying device 30 can expand the width of the gap 10b in stages and insert the passage partitioning portion 31 into the weft yarn guiding passage 10a. As a result, the tension applying device 30 of the air-jet loom 100 can reduce the load applied to the reed 11 and can expand the width of the gap 10b through the protruding portion 50.

[0085] (5) The width of the protruding portion 50 in the weft insertion direction W has a shape that becomes smaller in the weft insertion direction W as it moves away from the upper surface 31c of the passage portion in the up-down direction UD. Therefore, the width of the protruding portion 50 in the weft insertion direction W is the largest on the side closer to the upper surface 31c of the passage portion in the up-down direction UD, and the interval between the reeds 11 is expanded at the portion where the width is the largest. In other words, compared with the case where the cross-sectional shape of the protruding portion 50 has a uniform width when viewed from the front-back direction FB, the tension applying device 30 can reduce the contact area between the protruding portion 50 and the reed 11. As a result, the tension applying device 30 of the air-jet loom 100 can reduce the load applied to the reed 11 by the protruding portion 50.

[0086] (6) The width of the gap 10b that can be enlarged by the protrusion 50 is equal to or less than the maximum dimension in the weft insertion direction W of the drawing air exhaust port 31d. Fluff that can affect the air exhaust formed by the drawing air exhaust port 31d accumulates at the gap 10b located directly above the drawing air exhaust port 31d. In other words, it is desirable that the width of the gap 10b ensured by the protrusion 50 corresponds to the maximum dimension in the weft insertion direction W of the drawing air exhaust port 31d. In addition, widening the width of the gap 10b formed by the protrusion 50 that exceeds this maximum dimension imposes a load on each reed 11 whose spacing is enlarged by the protrusion 50. Therefore, the tension applying device 30 of the air-jet loom 100 can suppress the load applied to the reed 11 that delimits the gap 10b and reduce the accumulation of fluff at the gap 10b by making the width of the gap 10b that can be enlarged by the protrusion 50 equal to or less than the maximum dimension of the drawing air exhaust port 31d.

[0087] [Modification Example]

[0088] In addition, the above-described embodiment can be modified as follows. The above-described embodiment and the following modification examples can be implemented in combination with each other within a range where there is no technical contradiction.

[0089] ○ It is also possible that the width of the protrusion 50 in the weft insertion direction W is not equal to or less than the maximum dimension in the weft insertion direction W of the drawing air exhaust port 31d.

[0090] ○ It is also possible that the protrusion 50 does not become smaller in width in the weft insertion direction W as it moves away from the upper surface 31c of the passage portion in the up-down direction UD. For example, it is also possible that the connecting surface 54 of the protrusion 50 is a plane perpendicular to the upper surface 31c of the passage portion and the end surface 53 of the protrusion.

[0091] ○ It is also possible that the protrusion 50 does not become smaller in width in the weft insertion direction W as it moves away from the drawing air exhaust port 31d in the front-back direction FB. In this case, the protrusion 50 has a rear surface 52 of the protrusion that has the same width as the front surface 51 of the protrusion in the weft insertion direction W. In other words, the protrusion 50 is a columnar shape that has an axis in the front-back direction FB and has the front surface 51 and the rear surface 52 of the protrusion as end faces respectively.

[0092] ○ It is also possible that the protrusion 50 is not provided between the drawing air exhaust port 31d and the inner wall 10c in the front-back direction FB on the upper surface 31c of the passage portion. For example, it is also possible that the protrusion 50 is provided on the upper surface 31c of the passage portion and on the front side of the drawing air exhaust port 31d in the front-back direction FB.

[0093] ○ It is also possible that the protrusion 50 is not provided on the upper surface 31c of the passage portion. For example, as Figure 7As shown, alternatively, the protrusion 50 is provided on the back surface 31e of the passage portion. In this case, the protrusion 50 is provided at a position in contact with the reed 11 that forms the inner wall 10c and delimits a gap 10b opposite to the drawing air exhaust port 31d.

[0094] The tension applying device 30 is provided at a position where it contacts the inner wall 10c from the front of the reed 10 on the back surface 31e of the passage portion. When the tension applying device 30 is provided, after the end face 53 of the protrusion 50 is inserted into the gap 10b, the connecting surface 54 contacts the reed 11 that delimits the gap 10b. In other words, in the case where the protrusion 50 is provided on the back surface 31e of the passage portion, it is preferable that the protrusion 50 has a connecting surface 54 that becomes narrower in the weft insertion direction W from the back surface 31e of the passage portion toward the end face 53 of the protrusion. The protrusion 50 having the above structure can reduce the load generated on the reed 11 in contact with the protrusion 50 when the tension applying device 30 is inserted into the reed 10.

[0095] ○ Alternatively, the drawing air exhaust port 31d may be opposed to a plurality of gaps 10b.

[0096] ○ Alternatively, the protrusion 50 may contact only one of the reeds 11 that delimit the gap 10b opposite to the drawing air exhaust port 31d and expand the gap 10b. In this case, the width of the front surface 51 of the protrusion in the weft insertion direction W may also be smaller than the width of the gap 10b in the weft insertion direction W.

Claims

1. A tension applying device for an air jet loom, the tension applying device being provided in the air jet loom, the air jet loom inserting a weft yarn along a weft yarn guide path provided in a reed, and a plurality of reed blades being arranged in a weft insertion direction of the weft yarn, a gap being defined between each reed blade and a reed blade adjacent to the reed blade, The tension applying device includes a passage dividing portion, the passage dividing portion dividing a weft yarn running passage extending along the weft yarn guiding passage, The passage division portion has: an upper surface that is opposed to an upper wall of the reed that defines the weft guide passage; and an exhaust port, which opens on the upper surface and communicates with the weft yarn passage, The exhaust port is opposite to at least one of the plurality of gaps. jetting air toward the weft yarn passage to apply tension to the weft yarn, and exhausting the air from the exhaust port, The tension applying device of the air jet loom is characterized in that: The passage partitioning portion is provided with a protrusion, and the protrusion widens the gap facing the exhaust port by contacting the reed blade.

2. The tension applying device of the air jet loom according to claim 1, characterized in that: The protrusion is disposed on the upper surface.

3. The tension applying device of the air jet loom according to claim 2, characterized in that: The reed has an inner wall, and the inner wall defines the weft guide passage in a front-rear direction orthogonal to the weft insertion direction and the up-down direction. The protrusion is disposed between the exhaust port and the inner wall.

4. The tension applying device of the air jet loom according to claim 3, characterized in that: The width of the protrusion in the weft insertion direction decreases as the protrusion moves away from the exhaust port in the front-rear direction orthogonal to the weft insertion direction and the up-down direction.

5. The tension applying device of the air jet loom according to claim 2, characterized in that: The width of the protrusion in the weft insertion direction decreases as it moves away from the upper surface in the up-down direction.

6. The tension applying device of the air jet loom according to claim 5, characterized in that: The width of the protrusion in the weft insertion direction is less than or equal to the maximum dimension of the exhaust port in the weft insertion direction.

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