JPH0226962A - Method for tuck-in selvaging in shuttleless loom - Google Patents

Abstract

PURPOSE:To strongly hold a weft yarn end and prevent selvage slack of a woven fabric by securing and holding the picked and cut weft yarn end and simultaneously moving and approaching a tuck-in nozzle to the side of warp yarn rows before tucking in the end into the next warp yarn opening. CONSTITUTION:In a reed beating step by movement of a reed 3 after completing picking, a weft yarn 7 is advanced through a weft yarn guide unit 10 into a slit 21 and then cut by operation of a cutter 15. The end (7a) of the above- mentioned weft yarn 7 is secured in a receiving hole 31. In the next opening of picking, a jetting tip of a tuck-in nozzle 13 is moved and approached to the side of weft yarn rows 1 and the the afore-mentioned end (7a) of the weft yarn is bent at the base end with the jetted stream from the above-mentioned nozzle 13 to blow the tip into a warp yarn opening and carry out tuck-in.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tucking-in method for a shuttleless loom, in which the end of a weft yarn that has been beaten and cut to a required weft insertion length is tucked into the next warp opening.

In the conventional tuck-in selvage method for shuttleless looms, for example, as shown in Japanese Unexamined Patent Publication No. 62-53448, the ends of the weft yarns, which have been beaten and cut to a required weft insertion length, are It is known that the object is anchored and held in a receiving portion by a jet stream from a holding nozzle until the object is tuck-in.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 50-982, it is known that the end of the weft yarn that has been beaten and cut to a required weft insertion length is tucked into the next warp opening by a jet stream from a tuck-in nozzle. It is being

Problems to be Solved by the Invention In the case of woven fabrics having tuck selvedges, due to demand, the length into which the ends of the weft yarns are woven, the so-called tuck length, must be shortened, and - tack length. The tightness of the selvage is an important factor in determining the quality of textiles.

However, in order to hold the end of the weft yarn by the jet stream until it is tucked in, it is necessary to ensure the holding force by making the part exposed to the jet stream as long as possible.

In addition, when tucking in the ends of the weft yarn with a jet stream,
When there are no obstacles on the reed side, the jet stream diffuses toward the reed side, and the weft ends folded back into the warp opening are likely to be restrained by the warp rows in a state away from the front. When tucked in in this state, the restraint on the weft ends will be transferred sequentially from the base to the tip, so when the tips of the weft ends are not restrained, the base ends will receive bending force from the warp. It turns out. As a result, the warp tension overcomes the tension at the weft end, pulling the tip of the weft end toward the proximal end.
The weft ends are bent by more than a predetermined value, and as a result, the warp tension at the tuck selvedges is loosened, resulting in loose selvedges.

Therefore, the present invention aims to shorten the tuck base and improve the selvedge tightness when the jet flow holds the weft end until tucking in, and when the jet flow tucks the weft end into the next warp opening. The present invention provides a tuck-in method for a shuttleless loom that can improve the quality of fabrics having tuck selvedges.

Means for Solving the Problems One invention is to tuck the ends of the weft yarns, which have been beaten and cut to the required weft insertion length, into the next warp opening.
In a tuck-in selvage setting method for a shuttleless loom in which a jet stream from a holding nozzle of a weft end holding mechanism disposed on the side of the warp row is moored to and held at a receiving part of the weft end holding mechanism, the weft ends are fixed prior to the tuck-in. Move the holding mechanism toward the warp row.

Another invention is a shuttleless loom that tucks the ends of the weft threads, which have been beaten and cut to the required weft insertion length, into the next warp opening using a jet stream from a tuck-in nozzle placed on the side of the warp row. In the tuck-in selvage method, when tucking in the ends of the weft yarns, the tuck-in nozzle is moved toward the warp row side.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First Embodiment (See Figures 1 to 7) In Figures 4 to 7, the structure of the shuttleless loom used in the present invention will be explained. In the figure, 1 is a warp, 2 is a heddle frame, 3 is a reed,
4 is a weaving front line, 5 is a woven fabric, 6 is a weft insertion main nozzle that swings together with the reed 3, 7 is a weft, 8 is a yarn end processing system, 9 is a tuck-in selvage device, 10 is a weft insertion main nozzle 6 This is a weft guide provided on the outside of the side tuck-in selvedge assembly device 9.

Here, since the tuck-in selvage assembly device 9 is formed symmetrically and has the same basic structure, the structure of the tuck-in selvedge assembly device 9 on the side of the weft insertion main nozzle 6 will be described as a representative. The tuck-in selvedge assembly device 9 includes a tuck-in nozzle 13, an air-injection type weft gripping device 14, and a cutter I5. The tuck-in nozzle 13 and the weft gripping device 14 are formed in a single body 20.

That is, the body 20 is formed with a slit 21 that opens toward the reed 3 side. As shown in FIG. 5, this body 20 is attached to a loom frame (not shown) so that the warp line 22 is located in the middle of the slit 21.

The upper and lower edges 21U and 21B of the reed-side end of the slit 21 are sequentially expanded vertically so as to reliably guide the weft 7 to the slit 21. In the back wall 23 of the slit 21, as shown in FIG. 6, the center back wall 23C is located on the reed 3 side, and the left and right back walls 23L, 23R are inclined toward the weaving front line 4 side.

A tuck-in nozzle 13 is opened in the right rear wall 28H, and an air passage 24 communicating with the tuck-in nozzle 13 is formed in the body 20. Axis line 2 of the jet flow from this tuck-in nozzle ■3
5 is set so as to form an acute angle θ with respect to the weaving front line 4 when the body 20 is juxtaposed in the direction of elongation of the warp threads 1 as shown in FIG. This acute angle θ refers to the angle θ formed when viewed from above as shown in FIG. 6, and when viewed from the side as shown in FIG. do not have to.

The slit 21 allows the weft end 7a to be located near the central axis of the tuck-in nozzle 13.

On the other hand, weft end gripping device! 4 is a holding nozzle 30 and a receiving part 3
It consists of 1. The holding nozzle 30 is attached to the center back wall 23 of the upper member 20U that defines the slit 21 of the body 20.
It is formed close to G. The receiving part 31 is connected to the body 20
The center back wall 2 of the lower member 20B defining the slit 21 of
It is formed close to 3C. These holding nozzles 30
and the receiving portion 31 are arranged coaxially and facing each other with the slit 21 interposed therebetween. A four part 32 is formed in a portion of the upper member 20U of the body 20 closer to the reed 3 than the holding nozzle 30, so that surrounding air is easily drawn into the jet stream from the holding nozzle 30. Air passage 33 communicating with holding nozzle 30
is formed on the body 20. 34 is a blind plug. The air passage 24 and the air passage 33 are connected to a pressure air source 40 via a regulator 41. An electromagnetically driven on-off valve 43 is interposed in a pipe 42A branching from the regulator 41 to the air passage 24. regulator 4
The pipe 42B branching from the air passage 33 is equipped with an electromagnetically driven on-off valve 44 in order from the regulator 41 side.
．． A throttle valve 45 is interposed. These on-off valves 43.4
4 is controlled by a control circuit 46 to open and close the valve at a predetermined angle of the main shaft.

The cutter 15 is disposed on the side of the main weft insertion nozzle 6 of the body 20, and is set to perform a scissoring motion at a predetermined angle of the main shaft. It is located at 21.

The weft guide lO is disposed on the side of the weft insertion main nozzle 6 of the cutter 15, and guides the weft 7 to be beaten along its guide surface 1.
0a to ensure that it enters the slit 21. This weft guide IO may be provided on the side of the cutter 9 on the right side, but this is not an absolute requirement since the weft end treatment system 8 is provided.

Here, the body 20 including the tuck-in nozzle 13 and the weft end gripping device 14 directs the weft end portion 7a, which has been beaten and cut to a required weft insertion length by the cutter 15, toward one row of weft threads prior to tuck-in. It is designed to be moved. Specifically, the opposite end of the body 20 is attached to a loom frame (not shown) so as to be rotatable about a support shaft 50 in the weft stretching direction. The body 20 is urged toward the weft insertion main nozzle 6 by a spring 51. The spring 51 is attached to the loom frame, and its spring end is in contact with the side surface of the body 20 opposite to the weft inserting main nozzle. A cam follower 52 is attached to the pin 5 at the reed side end of the body 20.
It is connected by 3.

The cam follower 52 is configured to be in sliding contact with a cam 54 attached to the reed holder 11 on which the reed 3 and the weft insertion main nozzle 6 are assembled. Therefore, the body 20 is moved forward and backward about the support shaft 50 against the elasticity of the spring 51 toward one row of warp threads due to the back and forth movement of the reed holder 11, that is, the beating movement of the reed 3. It has a structure in which it is moved back toward the weft insertion main nozzle 6 by elasticity.

According to the structure of the first embodiment described above, the throttle valve 45 is adjusted during the preparatory operation of the loom to make the jet flow from the holding nozzle 30 suitable.

First, after the weft insertion is completed by starting the operation of the loom, the reed 3 is moved forward to beat the weft yarn 7. During this beating process, the weft yarn 7 is moved to the guide surface 1 of the weft yarn guide lO as shown in FIG.
0a and the upper and lower edges 210.21B and enters the slit 21.

At the front limit position of the reed 3, the body 20 is in a retracted position substantially parallel to the warp stretching direction, as shown in FIG.

Next, as shown in FIG. 2, when the reed 3 retreats a little from the front limit position, the cam follower 52 is pushed toward the first row of warp threads by the cam 54, and the body 20 is moved around the support shaft 50 by the spring 5.
While the warp threads 1 rotate against the elasticity of the warp threads 1, they begin to open in a slightly opposite phase after the warp threads 1 are closed, and the axis of the weft insertion main nozzle 6 becomes approximately on the same line as the center back wall 23C. When the weft 7 comes into contact with the center back wall 23G or moves to a position near it, the cutter 15 performs a scissoring movement,
Cut the weft thread 7. In this way, by cutting the weft 19 when it is in contact with the back wall 28 and in a substantially straight line up to the weft insertion main nozzle 6, the length of the weft end 7a can be made as short as possible. . At this time of disconnection, the on-off valve 4
3 is closed, the on-off valve 44 is opened, and the receiving hole 3 is inserted from the holding nozzle 30! Since the airflow is ejected toward the woven fabric 5, the weft end 7a of the cut weft 7 connected to the woven fabric 5 is pulled by the airflow, and the receiver is moored to the edge of the insertion hole 31, so that the weft end! 7a is gripped prior to tuck-in. The length of the warp yarns 7 exposed to the jet stream from the holding nozzle 30 of the weft end gripping device 14 increases by the distance d that the body 20 is moved from the retracted position shown in FIG. 1 to the intermediate position shown in FIG. The holding force of the weft end gripping device I4 on the weft end portion 7a becomes stronger, and the weft end portion 7a is firmly gripped.

Subsequently, as shown in FIG. 3, when the reed 3 is further moved back and the opening amount of the warp threads 1 becomes a state where weft insertion is possible, the next weft insertion is performed. As the reed 3 shown in FIG. 3 retreats, the cam follower 52 is further pushed toward the first row of warp threads by the cam 54.
The body 20 further rotates around the support shaft 50 against the elasticity of the spring 51 toward the first row of warp yarns, and the injection port of the tuck-in nozzle I3 approaches the first row of weft yarns, thereby improving the directivity of the jet flow. is increased, and the acute angle θ of the jet flow axis 25 with respect to the weaving front line 4 is set to a suitable angle of, for example, 2 to 6 degrees, while the on-off valve 43 is opened and the on-off valve 44 is closed. Ru. Then, holding nozzle 3
The jet flow from 0 decreases for a while and finally stops, and the jet flow from the tuck-in nozzle 13 increases for a while and becomes a predetermined flow. For this reason, the holding force of the weft end 7a of the weft end gripping device 14 decreases for a while, and the force that tries to blow into the warp opening, that is, the tuck-in force, increases for a while, as shown by the imaginary line in FIG. After the weft end portion 7a is bent into a two-shape shape at the base end, the tip end is blown into the warp opening and tucked in, as shown by the solid line in FIG. That is, when the tuck-in nozzle 13 approaches one row of warp yarns, the axis 25 of the jet stream forms an acute angle θ with respect to the weaving front line 4. It acts to press it even further, and the tip is tucked in at a position closer to the weaving front line 4 than the base end. The on-off valve 43 continues to be opened until near the end of weft insertion, and then is closed. Even after this valve is closed, the residual air in the pipe 42A causes the tuck-in nozzle! From No. 3 onwards, the injection is continued for a predetermined period while the injection amount is reduced for a while, so the weft end 7a remains in the above state and is restrained by the beaten warp l in the next beating cycle. For this reason, first,
After the tip of the weft end portion 7a is restrained by the warp I, the base end is restrained. Therefore, the tension at the proximal end of the weft end portion 7a does not fall below a predetermined value, so that the tip is not pulled toward the proximal side by the warp threads 1 and becomes loose. Thereafter, the on-off valve 44 is opened, and a jet stream is generated from the holding nozzle 30 toward the receiving hole 31 in preparation for cutting the next weft yarn 7. Further, in this first embodiment, when tuck-in, the jet flow from the tuck-in nozzle 13 is set at an acute angle θ.
The workability of the tuck-in nozzle 13 is improved by forming the tuck-in nozzle 13 substantially perpendicular to the side surface of the body 20 so that the tuck-in nozzle 13 faces in the weft elongation direction when the body 20 is in the retracted position. You can improve it.

Second Embodiment (See Figures 8 to 10) As shown in Figures 8 to 10, the body 20 including the tuck-in nozzle 13 and the weft end gripping device I4 is moved in parallel along the warp stretching direction. be. Specifically, the reed side and the non-reed side of the body 20 are slidably mounted in the weft stretching direction between a pair of front and rear guide rails 60 and 61 attached to the loom frame facing each other in the warp stretching direction. be. A spring 63 for biasing the body 20 toward the weft insertion main nozzle 6 is moored to the body 20 and a bracket 62 attached to the loom frame. Therefore, according to the second embodiment, the weft inserting main nozzle 6 becomes approximately on the same line as the center back wall 23C as shown in FIG. When the body 20 is retreated to the position, the cam follower 52 is pushed by the cam 54, and the body 20 is moved in parallel toward the first row of warp threads. The weft 7 is then cut by the cutter 15, and the weft end 7a continuous to the woven fabric 5 is gripped by the weft end gripping device I4. The length of the warp yarns 7 exposed to the jet stream from the holding nozzle 30 of the weft end gripping device 14 increases by the distance d that the body 20 is moved from the retracted position shown in FIG. 8 to the intermediate position shown in FIG. The holding force of the weft end gripping device 114 on the weft end portion 7a becomes stronger, and the weft end portion 7a is firmly gripped. Subsequently, when the reed 3 retreats from the position shown in FIG. 9 to the position where the warp opening can be inserted as shown in FIG. Translated to the closest position. In this state, due to the interaction between the closing of the on-off valve 43 and the opening of the on-off valve 44, the base end of the weft end portion 7a is first hit by the jet flow of the tuck-in nozzle I3 as shown by the imaginary line in FIG. After being bent into a letter shape, the tips are blown into the warp opening and tucked in.

Note that the present invention is not limited to the above embodiments,
Although not shown in the drawings, for example, (1) The fluid injected from the tuck-in nozzle 13 and the holding nozzle 30 is not limited to air, and may be selected from water, a mixed gas of water and air, a harmless gas, etc. as necessary.

(2) Although the holding nozzle 30 is designed to pull the weft ends by jetting fluid, suction airflow may also be used.

■Instead of the holding nozzle 30, a spring material is used to hold the weft end 7a.
The weft end gripping device may be configured mechanically so that the weft end gripping device releases the gripping when the fluid is ejected from the tuck-in nozzle 13.

(2) A jet stream may be constantly ejected from the holding nozzle 30.

(2) The injection ports of the tuck-in nozzle 13 and the holding nozzle 30 may be formed by an elongated hole, a cross shape, an orthogonal shape, or a group of a plurality of small holes.

(2) The jet stream from the tuck-in nozzle 13 may be sprayed onto the entire weft end portion 7a.

■The tuck-in nozzle 13 may be omitted from the body 20, and the body 20 including only this weft end gripping device I4 may be configured in combination with the tuck-in needle, or conversely, the weft end gripping device ■4 may be omitted from the body 20. , the body 20 including only the tuck-in nozzle 13 and a mechanical weft end gripping device can be combined.As described above, in the first invention, the cutter can be used to hold the weft end. The tuck length can be cut short by bringing the weft closer to the gripping device, and the gripping length by the weft end gripping device can be increased to strengthen the gripping force, so that the weft end is under a suitable tension. Can be tucked in,
It can make your ears tighter.

In the second aspect of the invention, the entire length of the weft ends can be restrained almost simultaneously or with the tip leading from the base, so that the tips of the weft ends are pulled toward the base by the warp tension of the selvedges. Never. As a result, ear loosening can be prevented.

As a result, 1. Any of the second aspects of the present invention has the novel effect of being able to supply a woven fabric with high quality reliability.

[Brief explanation of the drawing]

The seal is the number of the present invention! FIG. 2 is a plan view showing the state in which the reed in the embodiment is stopped at the front limit position, FIG. 2 is a plan view showing the state immediately after the cutter performs the scissor cutting operation in the first embodiment, and FIG. 3 is the plan view in the first embodiment. FIG. 4 is a schematic plan view of a fluid jet loom equipped with the tuck-in selvage device of the first embodiment, and FIG. 5 shows the tuck-in selvage device of the first embodiment. A side view, FIG. 6 is a plan view showing the essential parts of the tuck-in selvage assembly device in a cutaway manner, and FIG. 7 is a schematic configuration diagram including the air piping system of the tuck-in selvedge assembly device.
FIG. 8 is a plan view showing the state in which the reed according to the second embodiment of the present invention is stopped at the front limit position; FIG. 9 is a plan view showing the state immediately after the cutter performs the scissor cutting operation in the second embodiment; FIG. 10 is a plan view showing a state in which the weft ends are tucked in in the second embodiment. ■... Warp, 3... Reed, 7... Weft, 7a... Weft end, 3... Tuck-in nozzle, 4... Weft end gripping device, 30... Holding nozzle, ! ...Receptor. Fig. 2 Fig. 1 Fig. U 1... Warp 3... Reed 7... Weft 7a - Weft end 13... Tuck-in nozzle 1411 Yarn end gripping device 30... Holding nozzle 31 - Receiving portion Fig. 3 Fig. 6 Figure 8z Figure 9 Figure 10

Claims (2)

[Claims] (1) The ends of the weft threads that have been beaten and cut to the required weft insertion length are held by a jet stream from the holding nozzle of the weft end holding mechanism placed on the side of the warp row until the ends of the weft threads are tucked into the next warp opening. The tuck-in selvedge-setting method for a shuttleless loom in which the weft end holding mechanism is moored to and held by a receiving portion of the weft end holding mechanism, wherein the weft end holding mechanism is moved toward the warp row side prior to the tuck-in. How to tuck in your ears. (2) The tuck-in selvedge of a shuttleless loom where the end of the weft thread, which has been beaten and cut to the required weft insertion length, is tucked into the next warp opening by the jet stream from the tuck-in nozzle placed on the side of the warp row. A tuck-in selvedge tying method for a shuttleless loom, characterized in that, in the tying method, a tuck-in nozzle is moved toward the warp row side when tucking in the ends of the weft yarns.