JPH0673641A - Method for inspecting picking of air jet loom and device therefor - Google Patents

Abstract

PURPOSE:To discover the fine abnormal flow of the air fluid in high probability, enhance the stability of the picking of the loom and improve the operation rate of the loom by performing the inspection based on the speed distribution of the air fluid in the warp direction in a reed groove, the distribution being obtained at plural measurement points in the weft direction with a fluid speed detector transferable in the weft and warp directions. CONSTITUTION:In the picking inspection of an air jet loom, a transverse transfer motor 9 is operated with a controller to transfer the main body 6 of an inspection device along a guide rail 5 at a constant speed in the weft direction. When the existence of an auxiliary nozzle 2 of a position sensor 13 is detected, the main body is stopped, and a fluid speed detector 3 attached to a holder 7 is positioned in the cross section of a reed groove 4 predetermined as a measurement point in the weft direction. A longitudinal transfer motor 12 is operated for the intermittent transfer of the fluid speed detector 3 in the warp direction to measure the speeds of the fluid directed in the picking direction at plural positions in the warp direction and thus to determine the flow speed distribution of the fluid in the warp direction, thereby permitting to discover the fine abnormal flow of the fluid such as the local disturbance of the flow in the warp direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion inspection method and apparatus for an air jet loom, which uses both a reed and an auxiliary nozzle.

[0002]

2. Description of the Related Art In an air jet room in which a reed and an auxiliary nozzle are used together, the weft yarn is sent out to the reed groove by the jet air of the main nozzle, and then carried to the air stream formed in the weft insertion direction in the reed groove. Fly to the main nozzle side. The air flow in the reed groove is maintained over the entire length of the reed groove by the auxiliary nozzle group arranged along the reed groove.

A reed is one in which the warp yarns are arranged in a predetermined density and the weft yarns passed between the warp yarns are struck in front of the weave. The structure is composed of thin sheet metal reed blades closely arranged in a comb shape at regular intervals, and has a U-shaped flight path where wefts fly, that is, a reed groove.

A plurality of auxiliary nozzles are installed over the entire length of the warp threading width. From these auxiliary nozzles, in order to maintain the air flow in the reed groove, air is injected into the reed groove, which helps the weft yarn to fly from the main nozzle to the anti-main nozzle side.

Whether the weft thread can reliably fly in the reed groove from the main nozzle to the anti-main nozzle side is not limited to the fact that the weft thread is not scratched in the reed groove and the auxiliary nozzle is in the reed groove. It is determined by whether the air flow injected into the normal operation normally maintains the air flow in the weft inserting direction.

In order to prevent the occurrence of defects in the reed, it is known to inspect the reed before mounting it on the loom (Japanese Patent Laid-Open No. 62-62160).
-257443, JP-A-2-160958).

However, when the reed and the auxiliary nozzle are combined on the loom and actually operated for a long period of time, various problems which cannot be dealt with only by inspecting the reed before being attached to the loom occur.

For example, due to an abnormality that occurs when the reed or the auxiliary nozzle is attached, an abnormality of the auxiliary nozzle itself, a loosening of the auxiliary nozzle set screw due to long-term operation, glue sticking to the air injection port of the auxiliary nozzle, or adhesion of thread dust. It is said that the loom operability is deteriorated due to a poor air injection, a change in flow velocity in the weft insertion direction due to the adhesion of glue residue between reed blades and reed grooves.

That is, it is important to combine the reed and the auxiliary nozzle, measure the flow velocity distribution in the reed after a certain period of operation, and accurately detect the above abnormality from the result.

Conventionally, as a method and an apparatus for measuring the flow velocity distribution in a reed groove in a state where a reed and an auxiliary nozzle are combined and mounted on a loom, (1) one Pitot tube for detecting the flow velocity in the reed groove Movably in the weft direction to measure the flow velocity at a plurality of points in the weft direction, and (2) a plurality of pitot tubes are bundled with their tips flush with each other in one cross section of the reed groove. It is known that the flow velocity distribution can be measured at one time (Japanese Patent Laid-Open Nos. 61-167052 and 61-174455).

[0011]

By the way, in the case of the inspection based on the flow velocity distribution measured by the above-mentioned conventional method for measuring the flow velocity distribution and the apparatus therefor, it was found to be a minor abnormality although it is useful for finding a large abnormality. There is a difficult problem. In particular, in order to improve the operability of the loom for a long time, it is important to remove even minor abnormalities at an early stage, and it is the current situation that conventional flow velocity distribution measurement methods and equipment cannot meet this demand. is there.

The present invention has been made in view of the above problems, and an object thereof is to enable measurement of a flow velocity distribution in a reed groove which can detect even a slight abnormality, thereby improving the operability of a loom. And

[0013]

For this reason, in the invention of claim 1, as shown in FIG. 1, in the air jet loom in which the reed 1 and the auxiliary nozzle 2 are used in combination, the flow velocity detector 3 is set in the latitudinal direction. Direction, the flow velocity in the reed groove 4 is measured at each of the plurality of weft direction measurement points, and the inspection is performed based on the obtained meridional flow velocity distribution at each weft direction measurement point. Is what you are going to do.

Further, according to the second aspect of the invention, as shown in FIG. 1, the inspection device main body 6 movable along the guide rail 5 provided in the weft direction, and the inspection device main body 6,
The air jet loom weft inspection apparatus includes a holder 7 that is attached so as to be movable in the longitudinal direction, and a flow velocity detector 3 that is attached to the holder 7 and that measures the flow velocity in the reed groove 4. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the invention of claim 2 is shown in FIGS.
It will be described with reference to FIG. In FIG. 1, the X direction is the weft direction and the Y direction is the warp direction.

In the figure, 1 is a reed in which a large number of reed blades 8 are densely arranged, 2 is an auxiliary nozzle, and 4 is a reed groove.

A guide rail 5 is provided in the weft direction. The guide rail 5 in this embodiment also serves as the upper frame of the reed 1, but the guide rail 5 may be provided separately from the upper frame of the reed 1.

An inspection device main body 6 is provided on the guide rail 5 so as to be movable along the guide rail 5. That is, the inspection device body 6 is movable in the weft direction. The movement of the inspection device body 6 is performed by a weft movement motor 9 provided on the inspection device body 6.

The inspection device main body 6 has a generally downward E shape, and one downward groove is engaged with the guide rail 5, and the other downward groove is provided with a guide rod 10 and a ball screw 11 in the longitudinal direction. There is.

Reference numeral 7 is a holder, and the guide rod 10 and the ball screw 11 pass through the holder 7. The holder 7 is slidable with respect to the guide rod 10, the holder 7 and the ball screw 11 are screwed together, and when the ball screw 11 is rotated by the translating motor 12,
The holder 7 moves in the longitudinal direction along the guide rod 10.

A flow velocity detector 3 is attached to the holder 7, and a tip portion which is a detecting portion thereof is inserted into the reed groove 4. As the flow velocity detector 3, a Pitot tube is generally used, but a heat ray probe, a pressure sensor, or the like can be used as long as it can measure the flow velocity under an air flow.

A position sensor 13 is further attached to the inspection device body 6. As the position sensor 13, for example, a bundle of optical fibers which simultaneously emit and receive light and which detects the presence of the auxiliary nozzle 2 from the fluctuation of the amount of received light can be used.

As shown in FIG. 3, the weft movement motor 9 and the longitudinal movement motor 12 are connected to a controller 15 via a driver 14. When a Pitot tube is used as the flow velocity detecting means 3, the flow velocity detector 3 is connected to the controller 15 via the manometer 16. Also, the position sensor 1
3 is connected to the controller 15 via the detector 17.

A computer is usually used as the controller 15, and a signal sent from the position sensor 13 via the detector 13 and the flow velocity detector 3 (Pitot tube) to the manometer 1 are used.
Based on the flow velocity data sent via 6, the measurement data is stored together, and detailed settings relating to measurement such as drive control of the weft movement motor 9 and the longitudinal movement motor 12 are stored, and these are stored via the driver 14. Is to be executed.

Next, the contents of the invention of claim 1 will be explained together with the operation of this apparatus.

The weft movement motor 9 is operated by the controller 15 to move the inspection device body 6 along the guide rail 5 at a constant speed in the weft direction (usually + X direction). Position sensor 13
Detects the presence of the auxiliary nozzle 2 or detects the preset n-th auxiliary nozzle 2 and inputs the signal to the controller 15, the position of the auxiliary nozzle 2 is set as the base point in the controller 15 in advance. The inspection apparatus main body 6 stops at the designated position. As a result, the flow velocity detector 3 is stopped within the cross section of the reed groove 4 which is previously set as the weft direction measurement point.

The measuring points in the weft direction may be at regular intervals irrespective of the position of the auxiliary nozzle 2. In this case, the position sensor 13 may be omitted, and the measurement may be performed by intermittently moving the inspection device body 6 at intervals set in advance by the controller 15. However, in this description, it is assumed that the measurement is performed by setting a weft direction measurement point for each auxiliary nozzle 2.

When the reed 1 and the auxiliary nozzle 2 are inspected together, the weft direction measuring point is preferably a position where the jet air from the auxiliary nozzle 2 substantially flows along the shape of the reed groove 4.

Specifically, considering the diffusion of the jet flow from the auxiliary nozzle 2, the distance that the jet flow collides with the reed 1, and the arrangement pitch of the auxiliary nozzles 2, the distance between the auxiliary nozzles 2 and the flow velocity detector 3 is 50. It is preferably ˜120 mm, more preferably 70 to 100 mm. If this distance is too short, the jet flow does not sufficiently collide with the reed 1, so that the later-described longitudinal velocity distribution cannot be obtained as a distribution affected by the characteristics of the reed 1. On the other hand, if this distance is too long, the diffusion of the jet stream will proceed and the flow velocity distribution in the longitudinal direction will be ambiguous.

If the arrangement pitch of the auxiliary nozzles 2 is too short, the measurement at the above position may be affected by the adjacent auxiliary nozzles 2, which may make it difficult to detect the abnormality. Therefore, the arrangement pitch of the auxiliary nozzles 2 is preferably 50 mm or more.

On the other hand, in the case of inspecting the auxiliary nozzle 2 alone, it is preferable that the weft direction measuring point is at a position before the jet flow from the auxiliary nozzle 2 is diffused to some extent and before colliding with the reed 1.

Specifically, the auxiliary nozzle 2 and the flow velocity detector 3
Is preferably 5 to 70 mm, more preferably 30 to 50 mm. If this distance is too short,
Since the range of the flow velocity distribution of the jet flow in the longitudinal direction is narrow, an error is likely to occur when evaluating the jet direction of the auxiliary nozzle 2. On the other hand, if this distance is too long, the jet flow is affected by the reed 1, and the longitudinal flow velocity distribution based on the characteristics of the auxiliary nozzle 2 alone cannot be obtained.

Further, the number of measuring points in the weft direction for one auxiliary nozzle 2 is not limited to one, but it is preferable to set a plurality of points. In particular, at least one of the weft direction measurement point in the case of inspecting the reed 1 and the auxiliary nozzle 2 together and the weft direction measurement point in the case of inspecting the auxiliary nozzle 2 alone, preferably including both of them. Is preferred. Further, it is preferable that the weft direction measurement points are uniformly set and measured over the entire length of the reed 1.

Next, the controller 15 controls the translocation motor 1
2 operates, the flow velocity detector 3 attached to the holder 7 together with the holder 7 intermittently moves in the longitudinal direction (usually + Y direction), and the flow velocity in the weft inserting direction at a plurality of points in the longitudinal direction is measured, A longitudinal flow velocity distribution is obtained. The measurement results are input to the controller 15, respectively.

The number of measuring points in the longitudinal direction is preferably 3 to 70 or less in order to efficiently and accurately know the characteristics of the flow velocity distribution in the longitudinal direction. If the number of points is 2 or less, the characteristics of the flow velocity distribution are difficult to understand accurately, and even if the number of points is more than 70, it takes a long time for measurement and does not lead to improvement in accuracy. By the way, the flow velocity detector 3
When a Pitot tube is used as the above, the time required to measure one point is about 1 to 2 seconds including the moving time.

The measuring pitch is preferably 0.1 to 2 mm. If it is smaller than 0.1 mm, many measurement points need to be taken unnecessarily to obtain the flow velocity distribution, and if it is larger than 2 mm, it is not possible to measure a delicate flow velocity distribution.

When the measurement of the longitudinal flow velocity distribution for one auxiliary nozzle 2 is completed, the controller 15 operates the weft movement motor 9 again to move the inspection device body 6 in the weft direction, and the same operation is performed as follows. This is performed for the auxiliary nozzle 2.

In this way, the longitudinal flow velocity distributions for the number of auxiliary nozzles 2 installed on the loom are measured, and the results are collected by the controller 15 for one loom. The controller 15 can be used for a plurality of looms by one machine, and in this case, the result is stored and managed in an organized manner depending on which loom of which auxiliary nozzle 2 portion data is used.

FIG. 4 is a graph showing an example of the longitudinal flow velocity distribution. The vertical axis in the figure is the longitudinal direction (Y direction), and the origin of this longitudinal direction (upper end in the figure) is the deepest part of the reed groove 4. The horizontal axis is the flow velocity. The measurement is performed in a direction (+ Y direction) in which the flow velocity detector 3 is extracted from the reed groove 4 at a pitch of 1 mm from a point 1 mm before the deepest portion of the reed groove 4.

By the way, the general conventional inspection method is as follows:
Velocity values at one longitudinal measurement point (for example, point a in FIG. 4) are measured at multiple points in the weft direction, and the weft direction flow velocity distribution as shown in FIG. 5 is obtained to evaluate the reed 1 and the auxiliary nozzle 2. Is.

In the case of this conventional inspection method, one peak of the flow velocity is formed for one auxiliary nozzle 2, and an extreme abnormality of the auxiliary nozzle 2 or the reed 1 can be detected from the state change of this peak. is there. However, as shown in FIG. 6, even if the measured value at the point a is correct, there are innumerable longitudinal velocity distribution curves passing through this point, so that the correct velocity distribution in the longitudinal direction cannot be known. Further, in the method of inserting a bundle of a plurality of Pitot tubes into the reed groove 4 and measuring the flow velocity distribution in one cross section of the reed groove 4 at a time, the bundle of Pitot tubes to be inserted itself obstructs the flow, and It is impossible to measure a uniform longitudinal velocity distribution.

According to the present invention, one flow velocity detector 3 is moved not only in the weft direction but also in the longitudinal direction, and measurement is performed while suppressing the disturbance due to the insertion of the flow velocity detector 3 to a minimum. An accurate longitudinal velocity distribution as shown is obtained, and an abnormality is detected from the state of this longitudinal velocity distribution. According to the present invention, a slight abnormality can be found as compared with the conventional method of detecting an abnormality from the weft direction flow velocity distribution. The reason is considered to be as follows.

That is, a slight abnormality brings about local turbulence in the longitudinal direction of the flow, but it does not reach the extent of disturbing the flow as a whole in the weft direction. It is thought that the directional flow will be disturbed. Therefore, it is thought that it is difficult to find only large abnormalities in the conventional method of inspecting anomalies based on the weft direction flow velocity distribution, and it is possible to detect even minor anomalies in the present invention in which anomaly inspection is performed based on the longitudinal velocity flow distribution. To be

Further, according to the present invention, it is possible to know the characteristics of the reed 1 and the auxiliary nozzle 2 which have not been known so far. For example, it has been found that the highest flow velocity point in the warp velocity distribution is the point at which the weft yarn is most likely to fly, and if this highest flow velocity point is in the deep part of the reed groove 4, the weft yarn is unlikely to fly out. In the conventional method, it is not possible to know the position of the highest flow velocity point in the longitudinal direction, and such characteristics are unknown, but according to the present invention that can accurately grasp the longitudinal velocity distribution, many Characteristic information can be obtained.

In the present invention as well, it is possible to obtain a weft direction flow velocity distribution from a value at a fixed fixed point on the longitudinal direction side and use an inspection based on this distribution.

Next, examples and comparative examples of the invention of claim 1 will be shown.

Example 1 and Comparative Example 1 When both Example 1 and Comparative Example 1 were continuously operated for 25 days, 10 air jet looms each having an average number of weft stoppages per 24 hours of 7 or more were inspected. , The cause was elucidated.

As Example 1, the inspection method of the present invention using the inspection apparatus of the present invention described with reference to FIGS. 1 to 3 was performed. The weft direction measurement point was at a position of 80 mm from each auxiliary nozzle in the weft insertion direction, and the warp direction measurement point was 40 points at a 0.5 mm pitch from the 0.5 mm front side of the deepest part of the reed groove.

As Comparative Example 1, an inspection was conducted based on the conventional flow velocity distribution in the weft direction.

In both Example 1 and Comparative Example 1, a Pitot tube with an outer diameter of 1 mm was used to measure the flow velocity, and data processing was performed via a pressure gauge.

The weaving conditions for each air jet loom are as follows.

(1) Woven fabric Warp yarn: Cupra sizing yarn 50d / 30f Weft yarn: Cupra 75d / 74f Warp density: 50.3 yarns / cm Weft density: 32.6 yarns / cm Organization: Plain weave (2) Loom Tsudakoma Industrial Co., Ltd. Company-made air jet loom: Product name "Z
"A-100" and "ZA-103" (both 150 cm
Width) (3) Through width 135 cm (4) Reed 95 / whale size (2 pieces), total length 1450 mm, blade thickness 0.2 mm The number of rotations of the air jet loom, the main nozzle pressure, and the auxiliary nozzle pressure are the nozzle type. , Depends on the specifications of the reed,
Rotation speed 550-700 rpm, main nozzle pressure 1.7-
3.0 kg / cm ² G, auxiliary nozzle pressure 3.0 to 4.2
It was in the range of kg / cm ² G.

The inspection results are shown in Tables 1 and 2. “O” indicates that the reason why the average number of stops due to weft stop per 24 hours is 7 times or more can be clarified, and “X” indicates that it cannot.

[0054]

[Table 1]

[0055]

[Table 2]

[0056]

EFFECTS OF THE INVENTION The present invention is as described above, and since it is possible to detect even a slight abnormality with a high probability, weft insertion stability is improved and a high loom operability can be obtained. is there.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the invention of claim 2;

FIG. 2 is a view showing a state seen from the weft inserting direction in FIG.

FIG. 3 is an explanatory diagram of a measurement / control system.

FIG. 4 is a graph showing an example of a longitudinal flow velocity distribution.

FIG. 5 is a graph showing an example of a weft direction flow velocity distribution.

FIG. 6 is an explanatory diagram of a case where an attempt is made to obtain a longitudinal flow velocity distribution by a conventional inspection method.

[Explanation of symbols]

 1 Reed 2 Auxiliary nozzle 3 Flow velocity detector 4 Reed groove 5 Guide rail 6 Inspection device body 7 Holder 8 Reed blade 9 Weft movement motor 10 Guide rod 11 Ball screw 12 Position movement motor 13 Position sensor 14 Driver 15 Controller 16 Manometer 17 Detection vessel

Claims (2)

[Claims] 1. In an air jet loom using both a reed and an auxiliary nozzle, a flow velocity detector is moved in the weft direction and the longitudinal direction, and at a plurality of weft direction measurement points, inside the reed groove for each of the plurality of longitudinal direction measurement points. A weft insertion inspection method for an air jet loom, which comprises measuring the flow velocity of the air jet loom and performing the inspection based on the longitudinal flow velocity distribution at each weft direction measurement point. 2. An inspection apparatus main body movable along a guide rail provided in the weft direction, a holder movably attached to the inspection apparatus main body in a longitudinal direction, and a reed groove attached to the holder. And a flow velocity detector for measuring the flow velocity in the interior of the device.