KR100242925B1 - A weft feeler for a water jet loom - Google Patents

Abstract

In the configuration of the weft detector having an optoelectronic sensor supported by the detection base in the weft detection area and a shielding member covering an upstream side of the weft detection area, the detection main body includes an upper and lower thread guide part and a thread guide part defining the weft detection area. It comprises a connecting portion for connecting the rear end of the shielding member is composed of a pair of shielding parts spaced apart from each other in the weft insertion direction, the shielding portion is fixed to the connecting portion of the detection base body in a vertically overlapping arrangement. By fixing the rear end of the shielding member, an open structure of the sealed area is formed between the detection base and the shielding member, which can significantly reduce the unstable retention of water in the sealed area without any substantial contact with the water present in the weft detection area. . Therefore, any impact generated on the shielding member due to the collision of the jetting water is extremely small to be transmitted to the water present in the weft detecting region past the sealed region, whereby the weft insertion can be reliably and stably detected.

Description

Wish detector for water jet looms

1 is a plan view of a weft feeler and related components to which the present invention is applied.

2 is a perspective view of an embodiment of a weft detector according to the present invention.

3 is a side view of the weft detector.

4 is a plan view of the weft detector.

5 is a cross-sectional view taken along the line V-V in FIG.

6 is a plan view of one embodiment of the separated structure of two shield plates.

Figure 7 is a side view of the weft in a state coupled with the shield plate of Figure 6.

8 is a plan view of another embodiment of a separated structure of two shield plates.

9 is a side view of the weft thread in a state of engagement with the shield plate of FIG.

FIG. 10 is a plan view of another embodiment of a separated structure of two shield plates. FIG.

11 is a plan view of another embodiment of a separated structure of two shield plates.

12 is a plan view of another embodiment of a separated structure of two shield plates.

13 is a side view of the weft yarn in a state of being strongly coupled with two shield plates.

14 is a side view of the weft yarn in a weakly coupled state with the two shield plates.

15 is a plan view of another embodiment of a separated structure of two shield plates.

FIG. 16 is a plan view of another embodiment of a separated structure of two shielding plates. FIG.

17 is a plan view of another embodiment of a separated structure of two shield plates.

18 is a perspective view of another embodiment of the weft detector according to the present invention.

19 is a side view of the weft detector.

20 is a plan view of a conventional weft detector and its associated components.

21 is a partial cross-sectional side view of a general configuration of a conventional weft detector.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detector for a water jet loom, and in particular, a weft yarn for a water jet loom having a shielding member for preventing the ingress of jet water in a weft detector region formed in the main body of the detector. The present invention relates to an improvement of the injection water shielding function of an insertion detector.

In the following description, the "sealed area" means a space formed between the shielding member attached to the detector main body and the detector main body in an arrangement covering the weft detection area of the weft detector.

The present invention is effectively applied to the weft detector using an optoelectronic sensor. A typical configuration of such weft detector D includes a transmission photoelectric sensor.

On the reaching side of the weft yarn, a detector D for detecting the result of weft insertion is provided between the weft cutter C and the catch cord S as shown in FIG. As shown in FIG. 21, the weft pointer D includes a detector main body 3 comprising an upper warp guide 31, a lower warp guide 32, and a connecting portion 38 connecting the two warp guides at their rear ends. Include. Here, the "rear end part" means one end of the warp thread guide part spaced from the reed R shown in FIG.

The warp guides 31 and 32 pairs are vertically spaced apart from each other to define the entrance 30, the phase detection area 33 and the stand-by area 39 therebetween. When struck by the advancing body R, the weft W is introduced into the weft combiner region 33 which detects the weft insertion past the inlet 30. After passing through the weft detection area 33, the weft W is in the waiting area 39.

More specifically, the weft detecting area 33 is defined by the parallel guide surfaces of the warp thread guides 31 and 32. The optoelectronic sensor is composed of a light emitter 34 and a light receiver 35 that are spaced vertically apart from each other to form a straight beam path that intersects the weft detection area 33. In the case of the illustrated embodiment, the light emitter 34 is disposed in the upper warp guide 31, while the light receiver 35 is disposed in the lower warp guide 32. However, the arrangement can be changed according to the design of the weft detector D.

The transmitter 34 and the receiver 35 are preferably connected to a detection circuit (not shown) by an optical fiber 37. The optical fiber 37 transmits a command signal from the detection circuit to the transmitter 34 and a detection signal from the receiver 35 to the detection circuit. The detector main body 3 is fixed to the frame of the loom in a fixed portion 36 formed behind the connecting portion 38. Instead of the illustrated optoelectronic sensor, a reflective optoelectronic sensor can be used. In this case, the transmitter and the receiver are mounted to a common warp guide.

When the weft thread is normally inserted, the weft thread passes through the weft detection area 33 by the body strike motion to block the beam path between the transmitter 34 and the receiver 35. More specifically, if the beam path is blocked by the weft for a predetermined period after weft insertion, the detection circuit determines that weft insertion is successful. On the other hand, if the beam path is not blocked by the weft in the same period, the detection circuit determines that weft insertion is unsuccessful. The inserted weft W is woven into the fabric F by the beating motion of the body R and its tip is captured by a catch line S disposed downstream of the weft detector D (along the weft direction). 20 degrees). The picked weft moves to the waiting area 39 of the detector body 3 as the fabric F and the catch line S move, and are finally separated from the fabric F by the operation of the weft cutter C.

In the case of a water jet loom, the reflection water for the weft conveyance is ejected by the weft insertion nozzle, and reaches the position of the weft detector D after passing through the opening. As is well known, water enters the phase detection area 33 due to ambient moisture. When the jetted water enters the weft detection area 33 of the weft detector D, the water already present in the weft detection area 33 is disturbed by the intruded jet water to change the light intensity of the beam path. This change in light intensity is mistaken for the weft thread passing through the weft detection area 33 by the weft detector even if weft insertion is actually successful and the position of the weft detector has not been reached. As a result, the loom stop signal is not generated by the detection circuit, so that the loom must stop starting but continue to start. In order to avoid such a problem, it is generally used in the art to attach a shielding member to the detector main body to block the intrusion of sprayed water into the weft detection region of the weft detector.

One example of such a shielding member is proposed in Japanese Patent Laid-Open No. 4-241150. In the case of this proposal, a slit plate is attached to an upstream side of the weft detector at a position slightly separated from the weft detector main body, and similarly to the detector main body described above, the slits are provided with horizontal slits for the weft passage. It is provided.

However, in this conventional proposal, the injection water reaches the weft detecting region of the detector main body through the slits of the slits plate and disturbs the water already present in the weft detecting region. As a result, it was not possible to completely eliminate the adverse effect of the weft detector due to the sprayed water.

One solution for avoiding the above-mentioned problem is proposed in Japanese Patent Laid-Open No. 6-184880. Shown in FIG. 22 is the shield member of this proposal. At least one shielding member is attached to the detection main body so as to cover the weft detection area of the detection main body. More specifically, the shielding member includes upper and lower shielding members 1 and 2 extending vertically parallel to the detector main body 3, and the two shielding members 1 and 2 are upper and lower defining the weft detecting area 33. It is fixed to the thread guides 31 and 32. The above-mentioned sealed region 5 is formed between the shielding member and the detector main body.

When used in this prior art, the direct arrival of the reflected water to the weft detection area is almost completely prevented. However, there is another problem that the sprayed water that diffuses accumulates in the sealed region 5 and stays. As the continuous accumulation of the sprayed water fills the sealed area 5, the sprayed water is filled to come into contact with the water already present in the weft detecting area 33 of the detector main body 3. Then, the impact generated by the gypsum of the jetting water against the shielding member is transmitted to the water present in the weft detecting region past the water filling the sealed region. This shock transmission disturbs the water already present in the weft detection zone, causing a malfunction of the weft detector.

Furthermore, since the upper and lower shielding members 1 and 2 are fixed to the upper and lower thread guides 31 and 32, respectively, the above-described shock is transmitted through this connecting portion, thereby amplifying the disturbance of water already present in the weft sensing region.

As described above, the detection of the weft insertion becomes unstable due to the water disturbance in the weft detection area.

The basic object of the present invention is to ensure the detection of the weft insertion by minimizing the adverse effects of the injection water during the detection of the weft insertion in the weft detector used in the water jet loom.

According to the present invention, the weft detector includes a detection main body having a weft detection area defined by the upper and lower thread guides, a connecting portion connecting the thread guides at the rear end, and a light emitter and a light receiver supported by the thread guides. The weft detector further includes a shielding member disposed at a position slightly upstream from the detector body on an upstream side. The shielding member has first and second shielding portions fixed to the connecting portion of the detection main body in a state spaced apart from each other in the direction of the upward direction. These shields overlap each other up and down in a state covering the weft detection area. The first and second shields may be formed of either two separate shield plates or two single shield plates. At least one of the first and second shield plates is supported in a vertically adjustable position. Moreover, the weft guide plate may be selectively attached to the downstream side of the detector body.

The shields are arranged spaced apart from each other in the weft insertion direction and overlap the top and bottom. Moreover, these shields are fixed to the connecting portion of the detector basic body at a position away from the weft detection area. Due to this arrangement, the sealed area is opened at the upper and lower ends, and due to this open structure, no water retention occurs in the sealed area. Since there is no water in the sealed region, the impact of the shielding member caused by the collision of the reflected water is small enough to be transmitted to the weft detecting region and does not actually cause disturbance of water existing in the weft detecting region. As a result, the weft insertion can be reliably detected without any adverse effect of the jetting water.

In the case where the first and second shields are configured separately, these shields are connected to the connecting portion of the detector main body by a spacer. Since the at least one shield is arranged to be adjustable in the vertical direction, the position of the shield member can be adjusted as necessary in view of the design of weft insertion such as the kind of water and the condition of the injection water. When the weft guide plate is attached to the downstream side of the detection base body, the weft thread can be passed without any contact with the upper and lower guide surfaces of the detection base body, thereby preventing damage to the detector body that may be caused by contact with the weft yarn. You can do it.

Figure 1 shows the configuration of the weft detector and its associated parts to which the present invention is applied. The weft detector D is human downstream from the fabric F and is disposed between the weft cutter C and the capture line S.

The weft detector is fixed to a frame (not shown) of the loom by a suitable bracket. The weft detector D is arranged in a three-dimensionally adjustable position, and the position of the weft detector D is changed according to the specifications of the fabric being woven to the bracket.

The weft W is inserted into the opening by jetting of the jetted water by the weft insertion nozzle (not shown). The inserted weft W is pushed by the advancing body R and passed forward with the weft detector D and then moved forward with the body being hit by the fabric F. Body R is opened at the position where weft detector D passes to avoid undesirable interference between body R and weft detector D. After the body strike motion, the wefts are captured by the thread S and do not return into the opening. Thereafter, the weft W is advanced with the catch line S to the fabric F, cut by the weft cutter C, and separated from the fabric F.

2 to 7 show one embodiment of the weft detector of the present invention. Since the description of the detection basic body 3 has been described in detail above, it is omitted here. In this case, the shielding member is composed of two shielding portions. More specifically, the shielding portions are in the form of shielding plates 1 and 2. The shielding plate 1 protrudes forward from the front end of the upper thread guide portion 31 of the detection base body 3, and is configured to cover the upper cut of the detection base body 3 and the weft detection area 33 with respect to the sprayed water. The shield plate 2 protrudes forward from the front end of the lower thread guide part 31 of the detection base body 3, and is configured to cover the lower cutting of the detection base body 3 and the weft detection area 33. In the case of the illustrated embodiment, the shield plate 2 is arranged closer to the detection base body 3 than the shield plate 1, but the arrangement may be reversed.

As can be seen in FIG. 4, the shielding plates 1 and 2 are fixed to the connecting portion 38 of the detection base body 3 through the gap adjusting members 4a and 4b by the fastening screws 8. As described above, the two shielding plates 1 and 2 are horizontally spaced apart from each other in the weft advance direction in a state of covering the weft detecting region 33 on the upstream side of the detector main body 3 and overlapping up and down.

As shown in Figs. 4 and 6, the shielding plates 1 and 2 are separated from the detector main body 3 by the gap adjusting members 4a and 4b. The size of the internal spacing adjusting member 4a should be selected so that the jetting water does not stay in the space between the two shielding plates. More specifically, the inner shielding plate 2 and the detection body 3 should be separated by an interval of 2 mm or more. The size of the outer gap adjusting member 4b should be selected according to the size of the space to be left between the two shield plates 1 and 2.

The shielding plates 1 and 2 cover the weft detecting area 33 (see FIGS. 3 and 5) of the detector main body 3 at a position slightly separated from the detecting body 3, and overlap each other vertically at the lower and upper corners thereof to the weft detecting area 33. The intrusion of the injection water is prevented. Water stays in the weft detection area 33 and weft W moves across the space in which the water is present.

As shown in FIG. 6, a sealed area 5 is formed between the detection base body 3 and the two shield plates 1 and 2. As shown in FIG. As shown, the sealed area 5 is open at the upper and lower ends thereof in a slightly different state from the closed structure of the conventional detecting element 3 shown in FIG. Due to this open configuration, any jetting water that penetrates into the closed area can be discharged to the outside through the open upper and lower ends, and thus the retention of the jetting water in the closed area 5 can be significantly minimized.

The detection basic body D of the above-described configuration functions as follows. The inserted weft W is introduced into the weft detecting area 33 after moving along the inlet 30 which diverges according to the progress of the body R. Upon passing through the weft detecting area 33, the weft is bent due to the sliding contact with the lower and upper edges of the shield plates 1 and 2 as shown in FIG. As a result, the weft blocks the beam path formed by the transmitter and the receiver in the weft detection area 33. More specifically, the detection circuit determines that weft insertion is successful when the beam path is blocked before the predetermined period after weft insertion. Conversely, if the beam path is not blocked before the predetermined period after weft insertion, the detection circuit determines that weft insertion is unsuccessful. In the latter case, the detection circuit generates a loom stop signal and stops the operation of the loom.

At the time of weft insertion, the weft yarn is inserted into the opening while being carried by the jetted water ejected from the weft insertion nozzle. The progress of the jetting water is reliably interrupted by the two shielding plates 1 and 2 without reaching the weft detection area 33. As described above, water does not stay in the sealed chamber 5, and as a result, the impact generated by the collision of the sprayed water with respect to the shielding plates 1 and 2 is transmitted to the water remaining in the weft detecting region 33 after the sealed region 5. do. Moreover, the high rigidity at the connecting portion where the shielding plates 1 and 2 are separated from the weft detecting region 33 damps the impact when it moves to the weft detecting region 33. All these effects occur at the same time to prevent the disturbance of the water staying in the weft detection area 33 so as to ensure the detection of weft insertion.

The gap between the two shield plates 1 and 2 is set by the outer gap adjusting member 4b as shown in FIG. In the case where the spacing should be set large, a plurality of external spacing adjusting members 4b can be used as shown in FIG. Alternatively, a large gap adjusting member may be used. Depending on the size of the gap to be left between the two shield plates 1 and 2, a plurality of gap adjusting members having different sizes can be used in combination. It can be seen from the comparison of the configurations shown in FIG. 7 and FIG. When the overlapping degree of the two shielding plates 1 and 2 is equal, the greater the distance between the two shielding plates, the smaller the degree of bending of the weft due to the sliding contact with the shielding plates.

Instead of such a spacing member, the two shielding plates can be spaced apart from each other in the form of two shielding plates. For example, in the embodiment shown in FIG. 10, one shield plate 2 is flat and the other shield plate 1 is bent near the tip. In the case of the embodiment shown in FIG. 11, both shielding plates 1 and 2 are bent near the tip. In the embodiment shown in FIG. 12, the space | interval adjustment member 4b between the front-end | tips of two shielding boards bent near the edge part is interposed.

The two shielding plates 1 and 2 are preferably attached to the detector main body 3 in a vertically adjustable position.

For example, a shielding plate or the like is provided with a vertical slot for fixing these to the detector main body 3. Alternatively, a plurality of threaded holes are formed in the vertical alignment with the connection portion 38 of the detection base body 3. With this configuration, the degree of bending of the weft yarn can be freely adjusted when passing through the weft detecting region 33.

In the case of the embodiment shown in FIG. 13, the shielding plate 2 can be moved upward to reduce the overlapping degree of the two shielding plates, so that the weft bending degree can be made smaller than the weft bending degree of the embodiment shown in FIG. have. In this case, the weft is in sliding contact with the upper thread guide portion 31. In the case of the embodiment shown in FIG. 14, the degree of overlap is equivalent to that shown in FIG. 7, but the weft is moved near the horizontal axis of the weft detection area 33 so that the weft does not come into contact with the two shield plates 1 and 2. Do not. Thus, by changing the vertical position of the shield plate 1 and / or 2 freely, it is possible to adjust the size of the shielding area, the degree of bending of the weft yarn and the frictional resistance to the movement of the weft yarn through the weft detection area 33.

Different spacers may be used for different shielding plates. In the embodiment shown in FIG. 15, the shielding plate 2 is fixed by the fixing screw 8 to the connecting portion 38 of the detection basic body 3 by the gap adjusting member 4a, while the shielding plate 1 is secured by the same fixing screw 8. It is fixed to the connection part by the space | interval adjustment member 4b in the other position of the detection body 3.

The shielding plates 1 and 2 may be attached to or detached from the detection base 3 independently of each other. The shape of the screw hole and the shielding plate for fixing or using is configured to allow such independent attachment and detachment. Therefore, it is possible to adjust the position of the other shielding plate by making one shielding plate fixed, thereby making it easier to adjust the position. Needless to say, the above-described spacing adjustment can be performed in combination with such a position adjustment.

In order to make positioning easier and quicker, it is desirable to seal the shield plate and / or the probe body. In the case of weaving using two or more kinds of different weft yarns, it is preferable to couple the shielding plate to the detector main body in a position adjustable by separate drive means. The shielding plate may be placed in a suitable position before weft insertion depending on the type of weft yarn used and / or the weft insertion method used.

In the above embodiment, two separate shield plates are used, but a single structure may be used as shown in FIG. 16 and FIG. In the case of the embodiment shown in FIG. 16, a single metal plate is bent to form a shielding member 6 including a pair of parallel shields 61 and 62. FIG. The gap between the two shields 61 and 62 is set by the gap adjusting member 4c interposed therebetween. In the case of the embodiment shown in FIG. 17, the first shield 61 is bent near its distal end so that its distal end is spaced horizontally from the second shield 62. Thus, the two shields 61 and 62 are spaced apart from each other without using the above-described interposed adjusting member 4c. This technique may be combined with the above-described technique of spacing.

Such a shielding member can be formed by a known technique such as press working, metal casting and resin molding. The shielding member may be formed of any material having high rigidity.

In a more preferred embodiment of the present invention, the weft guide portion 7 may be attached to the side of the detection base 3 opposite to the shielding plates 1 and 2.

Like the sensing base 3, the weft guide 7 has a connecting portion 73 for connecting the two thread guides at a position corresponding to the pair of upper and lower thread guides 71 and 72 and the connecting portion 38 of the sensing base 3. The weft guide portion 7 further includes an inlet 74 and an atmosphere area 75 formed in communication with the inlet 74.

The entrance 74 and the waiting area 75 are defined by the rounded upper and lower edges of the seal guides 71 and 72. The inlet 74 is shaped to guide the weft to the horizontal axis of the weft detection area 33 of the detection body 3, while the atmospheric zone 75 is gradually separated from the weft detection area 33 to the detection body 3 and stays in the weft detection area 33. It is shaped so as not to contact. As entered by the slap motion of the body R, the inserted weft moves forward and comes into contact with the shielding plates 1, 2 and the weft guide portion 7 firstly protruding from the rear end of the detecting body 3. Due to the contact with the protruding components, the weft thread is guided to the weft detecting region 33 without any contact with the inlet 30 of the sensing base 3, and as a result, substantial damage to the weft yarn during the movement to the weft detecting region 33 occurs. Further, any impact generated in the weft guide portion 7 is not transmitted to the water staying in the weft detection area 33, which can avoid the disturbance. In the case of the above embodiment, the weft guide portion 7 is directly attached to the detection base body 3, but the weft guide unit 7 may be attached to the detection base body 3 in a separate configuration.

Basically, however, it is preferable that the weft guide unit 7 is maintained in direct contact with the detection base body 3. In the case where the weft guide portion 7 is arranged away from the detecting body 3, a large opening for passing the weft detector should be formed in the body, which may cause problems such as the inclination of the inclination or the unstable passage of the weft. The shape of the weft guide portion 7 is not limited to the illustrated embodiments in which the curved edges are gradually spaced from the corresponding edges of the detection base so that they do not come into contact with water remaining near the light emitter and the light receiver.

The weft thread is guided to the entrances of the shielding plates 1, 2 and the weft guide portion 7 before reaching the position of the weft detection area 33 of the detection body 3. Thereafter, the weft yarn is guided to the atmospheric zone 75 and further enters the water present in the weft detection zone 33. Since the weft guide unit 7 does not come into contact with the water in the weft detection area 33, no shock generated in the weft guide area 7 is transmitted to the weft detection area 33, and as a result, no substantial disturbance of water in the weft detection area occurs. . Moreover, the weft thread is guided without any contact with the detecting body 3 so that no damage occurs to the weft yarn when moving to the weft detecting region 33. Thus, the weft detector of the present invention can be used for a long time without causing any damage to the weft treated.

Since the shielding member is vertically overlapped and includes two shielding plates which cover the weft detection area and are fixed to the connection part of the detection base at a position separated from the weft detection area, the sealed area is opened at the upper and lower ends. Will be in a state. This open structure does not cause any substantial retention of water in the enclosed area. Since there is no water in the enclosed area, it is extremely small that any impact generated on the shielding member due to the collision of the sprayed water is transmitted to the weft detection area, which can greatly alleviate the unstable disturbance of the water staying in the weft detection area. have. As a result, the weft insertion detection can be performed using the weft detector of the present invention without any substantial adverse effect by the jetting water.

According to the present invention, the separate first and second shielding plates are fixed to the connection part of the detection main body by the gap adjusting member, or at least one of the two shielding plates is coupled to the detection main body in a vertically adjustable configuration. have. Therefore, the position of the shielding member can be freely adjusted as necessary according to the weft insertion condition such as water spray condition. When the weft guide portion is selectively coupled to the detection base body, each inserted weft can be guided to the phase detection area without any contact with the thread guide portion of the detection base body, thereby significantly reducing contact damage to the weft yarn. have.

Claims (6)

Detector body (3) comprising upper and lower thread guides (31, 32) and connecting portion (38) for connecting the meat guides at the rear end, shielding member attached to the sensing base body upstream along the weft insertion direction, In the weft detector for a water jet loom, which is composed of a light transmitter and a light receiver (34, 35) and a weft detection region (33) formed between the upper and lower thread guide portions, which are spaced up and down and supported by the inside, The shield member includes a pair of shield portions (1, 2:61, 62) spaced apart from each other in the weft insertion direction, And a pair of shields are fixed to the connecting portion 38 of the detection base body 3 in an arrangement overlapping the upper and lower detection area 33 to cover the weft detection area 33. The method of claim 1, Weft detector for water spray weaving, characterized in that the pair of shields are separate shield plates (1, 2). The method of claim 1, Weft detector for water spray weaving, characterized in that the pair of shields is a single shield plate (61, 62). The method of claim 1, A pair of shields are weft detectors for water spray looms, characterized in that the pair of shields are fixed to the connecting portions (38) of the detection base (3) by means of gap adjusting members (4a, 4b). The method of claim 1, Weft detector for water spray weaving, characterized in that at least one of the pair of shields is adjustable in the vertical direction. The method of claim 1, Weft guide unit (7) is a weft detector for water spray weaving, characterized in that attached to the detection main body (3) on the downstream side in the weft insertion direction.

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