JP2002266231A - Open width weft straightener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open width weft straightener capable of performing good weft straightening without applying overfeed before introducing into an open width mechanism. SOLUTION: The open width weft straightener is provided with an open width mechanism to laterally expand a continuous cloth delivered in longitudinal direction. The straightener is provided with a tension balance detection means placed at the upstream position of the open width mechanism and comparing the longitudinal tensions applied to the right and left edges of the cloth immediately before the introduction into the open width mechanism and a tension correcting means placed at the upstream side of the tension balance detection means and controlling the delivery of the right and left edges of the cloth based on the result transmitted from the tension balance detection means in a manner to cancel the difference between the tensile loads at the right and left edges of the cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting and correcting a grain bend, for example, before a fabric finishing step or a printing step.

[0002]

2. Description of the Related Art As a conventional cloth straightening machine, there is known a cloth straightening machine utilizing a function of maintaining a shortest distance in a widthwise weft structure, which occurs when a cloth is spread in the width direction. One of them is a cloth straightening machine using a pair of pin wheels.

[0003] This pin-wheel-type cloth straightener corrects a cloth by rotating an eight-shaped wheel in a front view while holding and holding both ends of the cloth at pins protruding from the outer periphery of the wheel. This causes the self-correction torque to be generated by the above-described principle of correcting the fabric weft texture, and the weft with the habit is extended perpendicularly to the running direction of the fabric, and the skew is caused along with the bend of the fabric. It will be corrected.

[0004] As such a spreading-type cloth straightening machine utilizing the rotation of a wheel, besides a pin wheel type, both ends of the cloth are sandwiched between a wheel and a belt crawled on the outer periphery of the wheel. There is a belt-type configuration for holding.

[0005]

However, in the above-described pin-wheel type apparatus, if the tension is applied in the width direction to the gantry, there is a risk that the pin may be broken or a fabric defect such as pin sink may occur. It was necessary to take preventive measures and constantly monitor the pin status.

[0006] On the other hand, the belt-type apparatus does not cause any harm such as pin breakage, but has a relatively low holding force of the cloth, and has a disadvantage that it is difficult to apply overfeed by rotating the cloth between itself. This is because, in the belt type, since the cloth is held on the surface, overfeeding the dark clouds may cause wrinkles or hinder the following of both ends of the cloth.

[0007] However, this overfeed is a necessary measure to prevent the principle of straightening of the fabric to be corrected when the fabric is expanded in the width direction by strong pulling in the traveling direction of the fabric. In addition, a method of spreading the cloth with almost no tension in the lead-out section is being studied.

Therefore, if the belt type is used without overfeeding due to the above-mentioned problem, various measures such as enlarging the wheel and increasing the spreading force have been devised. However, the self-correction to neglect the tension before introducing the cloth has been made. It was difficult to extract the torque.

On the other hand, if the structure is such that the fabric can be stored between the pins as in a pinwheel type, overfeeding is easy to apply, so that the degree of freedom in turning the wheel and the length of the fabric stored in the wheel also increase. Easy to concentrate self-correcting torque.

[0010] Further, in the spreading-type cloth straightening machine, a configuration in which the running of the cloth is hindered by the spreading mechanism is not preferable. This is because not only is it difficult to correct the texture, but it also causes a new intermediate bending in the fabric once corrected by spreading. this is,
In particular, it is remarkable in a belt-type wheel whose rotation resistance is larger than that of a pin-wheel type, and in many cases, the pin-wheel type is unavoidably used.

However, even in the pinwheel type, since the turning resistance is not eliminated, the curvature must be corrected near the outlet of the cloth straightening machine. If a means of the same type as the warp is used for the curvature correction, such as a bend bar, the curvature of the bend does not always coincide with the curvature of the cloth, so that local curvature is likely to occur. There were also problems, and it was difficult to correct the curvature.

[0012] The main object of the present invention is to solve the above problems,
It is an object of the present invention to provide a spreading-type cloth straightening machine capable of performing a good cloth correction without applying overfeed before introducing the cloth into a spreading mechanism. Another object of the present invention is to provide a spreading-type cloth straightening machine that can easily correct a curved line caused by driving resistance of a cloth in a spreading mechanism.

[0013]

In order to achieve the above object, a spread-type cloth straightening machine according to the first aspect of the present invention comprises:
In a spreading-type cloth straightening machine provided with a spreading mechanism for spreading a long cloth fed in a length direction in a width direction, a left and right ends of the cloth are disposed at an upstream position of the spreading mechanism and immediately before being introduced into the spreading mechanism. Tension balance detecting means for comparing the tension state in the length direction generated in the portion, and disposed at a position upstream of the tension balance detecting means, based on the result from the tension balance detecting means, the tensile load of the left and right ends of the fabric Tension balance correcting means for controlling the unwinding of the left and right ends of the cloth in a direction to offset the difference.

According to a second aspect of the present invention, there is provided the spread-type cloth straightening machine according to the first aspect, wherein the tension balance detecting means includes a swing center at a center position in the width direction of the cloth. And a balance roll having:

According to a third aspect of the present invention, there is provided the cloth spreading type straightening machine according to the first aspect of the present invention, wherein the spreading mechanism holds the both ends of the cloth. It has a pair of wheels that rotate with the same drive torque while spreading apart from each other in the cloth width direction to spread the cloth.

According to a fourth aspect of the present invention, there is provided the spread-type cloth straightening machine according to the third aspect, wherein the drive torque control means controls the increase and decrease of the drive torque of the pair of wheels. It is provided with.

In the spreading type cloth straightening machine according to the present invention, when the cloth is introduced into the spreading mechanism when the cloth is skewed and spread, the straightening torque generated from the cloth itself causes the right and left ends of the cloth to extend in the length direction. The skew correction is performed by detecting the occurrence of a difference in the tension state and controlling the feeding of the cloth based on the detection result so as to eliminate the difference.

For example, in the case where the right fabric of the fabric introduced into the spreading mechanism is delayed, the right spreading portion generates a torque that tends to accelerate in the traveling direction and simultaneously generates a torque according to the above-described correction principle. In the spread portion, the torque is released by the amount to be decelerated, a stronger tensile load acts on the right side of the fabric than on the left side, and a difference occurs in the tension state at the left and right ends of the fabric.

Therefore, if a difference is detected by comparing the lengthwise tension states of the left and right end portions of the fabric before introduction to the spreading mechanism, one of the left and right sides of the fabric skews later than the other. If the feeding of the fabric is controlled so that the difference is canceled and the tension is balanced between the right and left sides, the skew is corrected when the next fabric is introduced into the spreading mechanism.

In the present invention, the tension balance detecting means detects the tension in the length direction at the left and right ends by the self-correcting torque generated at the time of spreading due to the skew of the cloth, and the result of comparison between the left and right is detected by the detecting means. It feeds back to the tension balance correction means further upstream, and in this correction means, the difference in the lengthwise tension state at the left and right ends,
That is, the tension balance between the left and right ends of the cloth introduced into the spreading mechanism is adjusted by controlling the unwinding of both ends of the cloth so that the difference in the tensile load is eliminated, and as a result,
The skew correction can be completed before the cloth correction by spreading.

Since the tension balance detecting means in the present invention only needs to be able to detect the difference in the tension in the length direction between the left and right ends of the fabric, a mechanism for measuring the tensile load in the length direction separately for each of the left and right ends to obtain the absolute value. The present invention is not limited to this, and a mechanism capable of performing a left-right relative comparison may be used.

For example, the simplest configuration is one using a balance roll with the center of run-out positioned at the center in the width direction of the fabric. In the natural state, the rotation axis direction of the balance roll is along the width direction of the cloth, and the balance roll rotates following the movement of the cloth immediately before being introduced into the spreading mechanism.

Therefore, when a difference occurs in the tension in the length direction between the right and left ends of the cloth, the correction torque of acceleration is increased by the spreading force of the spreading mechanism on the side where the tensile load is large, that is, on the side where the cloth is delayed. The roll end in contact with the cloth on the side where the roll occurs is rotated so as to be pulled in the cloth running direction about the swing center as the rotation center.

Therefore, the deflection amount of the balance roll is
For example, it is possible to measure the deflection angle of the balance roll by using a potentiometer, or to detect the position by a plurality of proximity switches arranged around the deflection orbit of the end of the balance roll. In this case, it is sufficient to adjust and control the feeding of the fabric so as to offset the swing amount by the tension balance correcting means on the upstream side. In addition, such a balance roll can improve responsiveness by reducing inertia as lightly as possible.

As the tension balance correcting means, it is convenient to use a straightening roll installed on the cloth running path upstream of the balance roll so as to have a swing center at the center in the width direction of the cloth. That is, if the straightening roll is rotated by the same amount in the direction opposite to the swing amount of the balance roll, the swing amount of the balance roll is canceled, and the difference in the tension in the length direction between the left and right ends of the fabric can be eliminated.

As described above, in the present invention, it is only necessary to detect the tension balance between the left and right ends of the cloth, so there is no need to loosen the running tension when introducing the cloth spreading mechanism to the dark cloud and apply overfeed as in the prior art. Rather, it is better to balance the left and right tensions as described above while introducing the fabric to the spreading mechanism with a certain amount of tension applied in the length direction than to introduce the fabric without tension or negatively. The detection accuracy by the detecting means is high, and the correction can be stably and favorably performed during the operation of the apparatus.

As described above, in the present invention, it is not necessary to apply overfeed when introducing the cloth into the spreading mechanism. Therefore, it is not always necessary to use the pinwheel type as the spreading mechanism, and it is possible to adopt the belt wheel type to break the pin. This eliminates the need to take countermeasures such as adverse effects. Of course, it goes without saying that the pinwheel type can be adopted as the spreading mechanism of the present invention.

The spreading mechanism of the present invention is not limited to the wheel type using pins or belts. However, it is preferable that the difference in driving resistance between the left and right is as small as possible, and that the torque generated when the cloth is corrected by spreading is ignored. Since a structure that does not require a large driving torque is preferable, it is convenient to adopt a wheel type having a small driving resistance and excellent reproducibility.

As described above, when a pair of wheels are used as the spreading mechanism, the spreading of the fabric is performed by holding the both end portions of the fabric on each wheel and rotating them with the same driving torque on the left and right while separating from each other in the width direction of the fabric. Let it.
For example, if a pair of wheels are installed in an eight-height shape when viewed from the front, a spreading mechanism can be easily obtained.

If the pair of wheels are driven at the same driving torque on the left and right so that they can rotate at the same speed as the running cloth, both ends of the cloth do not affect the driving of the spreading mechanism, and The occurrence of bending can be prevented.

Further, if the driving torque of the pair of wheels can be increased / decreased by the control means, it is possible to arbitrarily produce a state of middle advance or middle delay within a certain range. Therefore, even if a curved bend occurs at the outlet of the spreading mechanism in the cloth that has been corrected once by the spreading mechanism that does not have no driving resistance even if it is small, a direction in which the curved bend is eliminated by controlling the increase and decrease of the driving torque. In this case, a middle-advance or middle-delay state can be created and corrected.

Such a drive torque control means may be capable of calculating a torque control increase / decrease amount in accordance with the current cloth running speed and the degree of curving of the cloth, and capable of adjusting and controlling the drive motor and the like of each wheel. Therefore, it is preferable to provide a curved texture detection means on the downstream side of the cloth spreading mechanism so that the detection result can be used for calculation by the drive torque control means.

As the curved texture detection means, for example,
A configuration in which a device for detecting a cloth angle near both right and left ends of the cloth is installed is simple. However, in the present invention, as described above, since it can be assumed that the skewed cloth bend has already been corrected and there is no skew in the downstream of the spreading mechanism, when a curved bend occurs in the fabric, this is symmetrical at the left and right ends. And the detector can be installed only on one of the left and right ends of the cloth. As the texture angle detecting device, any means capable of detecting the texture angle can be widely used. Of course, a conventionally used detector such as a slit detection type detector may be used.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spread-type cloth straightening machine according to an embodiment of the present invention will be described below together with an embodiment shown in the drawings, taking as an example a case in which a belt-wheel-type spread mechanism is provided. FIG. 1 is a schematic block diagram showing the overall configuration of the spread-type cloth straightening machine of the present embodiment, FIG. 2 is a side view showing the arrangement of main components of the present cloth straightener, and FIG. It is explanatory drawing which shows the signal flow of curvature correction.

In the present fabric straightening machine, the fabric 19 passes through the tension balance straightening unit 1 which forcibly corrects the lengthwise tension balance at both left and right end portions of the fabric by the skew straightening roll 11 or the like as shown by the flow 20. It passes through a tension balance detection unit 2 that detects a change in the tension balance in the length direction at both left and right ends of the fabric by a balance roll 12 or the like.

Further, a pair of wheels (15, 16) provided with drive motors (17, 18) capable of applying the same drive torque to the left and right, respectively, are installed so as to crawl along the outer periphery of the wheels. Belt (13,
14), the rolls pass through a spreading mechanism unit 3 for expanding the fabric 19 in the width direction, pass through a curved-mesh detecting unit 4 that detects the curved-mesh bending of the fabric 19, and roll along with the roll. It passes through a cloth traveling speed detecting unit 5 as rotation detecting means for detecting rotation.

In the tension balance detecting section 2, a balance roll 12 whose center of deflection is positioned at the center of the running cloth 19 in the width direction is arranged with its rotation axis direction along the cloth width direction, and is introduced into the spreading mechanism section 3. Immediately before, the cloth 19 rotates following the running of the cloth 19.

When a difference occurs in the tension in the length direction between the left and right ends of the cloth 19, the balance roll 12 delays the fabric and causes the spreading force by the spreading mechanism 3 to generate the acceleration correcting torque. The roll end rotating in such a manner as to be pulled in the cloth running direction about the swing center as the rotation center. Therefore, the tension balance detection unit 2 in the present embodiment measures the amount of run-out (shown by an arrow in the figure) of the balance roll 12, and uses the amount of run-out as a detection result of the difference between the lengthwise tension states at the left and right ends of the fabric. The tension balance control unit 6 is used for skew correction in the tension balance correction unit 1 on the upstream side.

That is, in the present embodiment, the tension balance controller 6 and the tension balance corrector 1 constitute a tension balance corrector of the present invention, and the tension balance controller 6 detects the tension balance from the tension balance detector 2. Based on the result, the balance roll 12
The tension balance correction unit 1 is controlled so that the balance correction roll 11 is rotated by an amount that cancels out the amount of runout to adjust the feeding of the cloth 19. Thereby, the cloth 19
The skew is temporarily eliminated, and thereafter, immediately before introduction to the spreading mechanism 3, the lengthwise tensions at the right and left ends are already in a state of being balanced, and the cloth 19 is moved to the pair of left and right wheels (1).
5, 16).

Various means can be considered for measuring the amount of deflection of the balance roll 12. However, it is desirable that the device configuration be simpler, and it can be configured by combining existing various detection devices.

For example, as shown in FIG. 4A, a configuration in which the deflection angle of the balance roll 12 is measured using a potentiometer 24 is conceivable. In this case, a gear piece 22 concentric with the center of the roll swing is placed on a roll support fitting 21 swinging with the balance roll 12 by a potentiometer 24.
Is mounted in a meshing state with the gear 23 that is interlocked with.

Accordingly, the gear piece 22 on the support fitting 21 which swings with the balance roll 12 rotates the gear 23 by the amount of the movement, and this rotational movement is converted to a potentiometer 24.
And the deflection angle corresponding to the amount of rotation is detected. The balance control unit 6 controls the straightening roll 11 in the tension balance straightening unit 1 based on the detection result from the potentiometer 24 so that only the angle for offsetting the swing angle of the balance roll 12 is reversed. be able to.

Further, as shown in FIG.
A configuration in which a plurality of proximity switches 25 are arranged on the deflection orbit at the end of No. 2 and the amount of deflection is obtained by detecting the position of the end that has moved according to the deflection of the balance roll 12. To detect only the presence or absence and the orientation of the balance roll 12, two proximity switches 25 are provided near both ends of the balance roll 12. For example, when the balance is balanced and no shake occurs, both switches are used. It is only necessary to set them so that they are both off, and when the balance is lost, only one of the proximity switches is turned on.

As described above, various detecting devices such as the measuring means using the potentiometer 24 and the proximity switch 25 are appropriately selected and combined, and the balance roll 1 is used.
2 can be used for measuring the amount of shake.

The pair of left and right wheels (15, 16) constituting the spreading mechanism 3 are respectively driven by a driving motor (1).
7, 18) to rotate independently in the cloth running direction, and both drive motors (17, 18) apply substantially equal drive torque to the left and right wheels (15, 16).

The pair of left and right wheels (15, 16)
As shown in FIG. 3, the rotation axis direction is set so as to rotate while separating from each other in the width direction of the fabric in an eight-height shape when viewed from the front. As a result, the running cloth 19
The left and right ears are sandwiched between the left and right wheels and the left and right belts (13, 14) circulating at the same speed as the wheel rotation speed along the respective outer peripheries thereof, and are moved to the spreading mechanism unit 3. The left and right wheels (15,1
With the rotation of 6), both ends are pulled in the width direction toward the maximum gap between the left and right wheels and spread.

The cloth 19 spread and corrected in the spreading mechanism 3 is released from the left and right wheels (15, 16) and is led out from the spreading mechanism 3, and then the running tension of the cloth 19 near the outlet is provided. Then, the process proceeds to the curved texture detection unit 4 via the dancer roll 10 for detecting.

Accordingly, in the present fabric straightening machine having the above-described structure, the cloth 19 traveling through the tension balance correcting section 1 and the tension balance detecting section 2 is
The left side of both ends is the outer circumference of the left wheel 15 and the left belt 13
The right side is the outer periphery of the right wheel 16 and the right belt 14
Are introduced into the spreading mechanism 3, and are spread in the width direction as the left and right wheels rotate in the direction away from each other with the same driving torque.

As described above, the cloth 19 to be expanded in the width direction is required to have the shortest weft structure, and a torque for correcting the cloth is generated. At this time, for example, in the case where the cloth 19 has a skewed cloth curve that advances to the right, the tension in the length direction at the right end of the cloth 19 is loosened immediately before the cloth 19 is introduced into the spreading mechanism unit 3, and the tension in the length direction is increased at the left end. In the case where there is a skew running to the left, on the other hand, it acts in a direction in which the left side is loosened and the right side is strongly pulled.

As described above, when the tension balance is lost on the left and right sides of the cloth 19, the tension balance detecting unit 2 detects the amount of deflection of the balance roll 12 according to the difference between the tension states at the left and right ends, and the tension balance control unit. 6 is transmitted. Tension balance controller 6
Then, while measuring the correction timing based on the cloth traveling speed obtained from the cloth traveling speed detecting unit 5, in accordance with the detection result signal sent from the tension balance detecting unit 2, the deflection amount of the balance roll 12 is offset. The tension balance correction unit 1 is controlled so that the degree of inclination of the skew roll 11 is adjusted.

By repeating the above operation, the state in which the rotation axis direction is parallel to the width direction of the cloth 19 can be maintained without the balance roll 12 swinging. That is, the tension in the length direction at the left and right ends of the cloth 19 is adjusted, and the cloth 19 is introduced into the spreading mechanism 3, which means that the skew correction is already performed when the cloth 19 is introduced into the spreading mechanism 3. It can be determined that it has been achieved.

The tension in the length direction of the portion where the cloth 19 is introduced into the spreading mechanism 3 is preferably set to a certain degree in order to facilitate the above-described tension balance adjustment. In the state where the tension is applied in this manner, an effect of improving the cloth bending straightening correction force for the skew can be expected. In particular, in the belt-wheel-type spreading mechanism as in the present embodiment, since the looseness of both ends of the cloth 19 is eliminated, it is convenient for the wheel to follow the cloth end.

Further, in the cloth straightening machine according to the present embodiment,
The cloth 19, for which the cloth correction has been substantially completed by the spreading by the spreading mechanism unit 3, may receive torque for rotating the left and right wheels (15, 16) and the belts (13, 14) at both ears. However, there may be a case where the intermediate texture is bent. Therefore, in the present embodiment,
A mechanism for correcting the bending of the curved texture is provided.

That is, in the present apparatus, the curved cloth detection unit 4 and the left and right wheels (15, 16) are provided downstream of the cloth spreading mechanism 3.
Drive motor (1) so that the drive torque of
7, 18).

The curved texture detection unit 4 includes, for example, texture angle detectors near the left and right ends of the fabric 19, respectively, and detects a middle-delayed curve in the fabric 19 from the texture angles at the left and right ends. is there. Alternatively, as described above, it can be assumed that the skew correction has already been completed on the cloth 19 that has passed through the spreading mechanism unit 3 and the cloth angle is symmetrical.
It is good also as a structure which detects the texture angle of only one of both right and left ends.

As the texture angle detector, various means can be used. For example, it is convenient to use, for example, a slit detection type texture angle detector generally used conventionally. In this method, light is transmitted from the back side of the fabric and the amount of light is detected by a photoelectric converter through a slit hole having the same width. When the interval, that is, the weft yarn interval, is set so that the slit hole longitudinal direction is parallel to the weft yarn, light shielding and transmission appear alternately by the stripe-like weft yarn and weft yarn gap passing alternately with the cloth running, This utilizes a phenomenon in which the detected light amount changes in brightness.

For example, if the weft is inclined with respect to the direction perpendicular to the running direction of the cloth and the longitudinal direction of the slit due to the curvature of the end of the cloth, partial skewing and transmission continue in the slit hole, and the detected light amount is reduced. There is no sharp difference in brightness. Therefore, the result of the light amount detection from the photoelectric change period is monitored, and if such a state in which the degree of the light-dark difference is small is detected, it means that the texture curvature has occurred.

Therefore, if the slit hole is inclined until the state where the degree of the light-dark difference is the largest, the longitudinal direction of the slit hole coincides with the curved cloth direction at that point, and the inclination of the slit hole The angle can be measured as the angle of inclination of the weft cloth. Therefore, the drive torque controller 7 may control the rotational torque based on the measurement result and the traveling speed from the cloth traveling speed detector 5 so as to cancel the inclination angle. In the slit detection method as described above, angle detection with sufficiently high accuracy can be performed on a general cloth of vertical and horizontal lattice weave.

Further, in a cloth in which the weave structure such as satin weave and twill weave is complicated and stripes due to the arrangement of the ridges appear as well as the stripes of the weft, the slit detection method for the weft yarn mesh as described above is used. When it is difficult to detect the texture angle, it is possible to detect the texture well by using the following moiré detection method.

In this moiré detection system, the weft direction is detected by observing the moiré corresponding to the weft density of the cloth using a density measuring device (densimeter). That is, if the weft yarn density, which is the number of weft yarns per unit width, is set with a densimeter, the strongest moire is detected in a state where the width direction measured by the densimeter is orthogonal to the weft yarn direction.

Accordingly, when the cloth has no curvature and the weft runs along the direction perpendicular to the cloth running direction, the strongest moire can be detected when the measured width direction of the densimeter coincides with the cloth running direction on the cloth surface. If there is a weft inclination due to bending with reference to the angle of the densimeter at this time, the inclination angle at the time when the strongest moiré is detected by inclining the densimeter can be measured as the inclination angle of the weft.

The moiré detection method using a densimeter as described above has the same effect as detecting a large number of slit holes side by side, as compared with the slit detection method, and the cloth angle detection is much more accurate. In addition to the above, it is possible to avoid erroneous detection due to awning or the like as seen in the slit detection method. In addition, a detection method that captures only twill becomes possible.

On the basis of the results detected by the curved cloth detection section 4 as described above, the drive torque control section 7 determines the direction of the middle advance or middle delay of the cloth 19 and the strength, and detects the cloth traveling speed detection section 5. The wheel drive motor (17, 1) of the spreading mechanism 3 is based on the cloth traveling speed obtained from
8), the drive torque of the left and right wheels (15, 16) is increased or decreased so as to match the running speed of the fabric 19 so as to eliminate the middle advance or middle delay of the fabric 19.

As described above, even when the drive torque increasing / decreasing control is applied to the drive motors (17, 18) by the drive torque control unit 7, by making the left and right sides as uniform as possible, the self-generation of the cloth 19 generated by the spreading can be achieved. Do not affect the straightening torque.

The drive motors (17, 18) preferably have a structure capable of positively slipping, and are controlled so that excessive drive torque is not transmitted. For example, when a torque is generated by slipping between the rotation speed of the magnetic field and the rotation speed of the rotor as in a torque motor, when the left and right wheels (15, 16) have a peripheral speed V
The driving torque generated as the vehicle accelerates to the maximum is reduced. If the peripheral speed V is controlled so as to be equal to the running speed of the cloth 19, the decrease in which both ends of the cloth 19 held by the wheels (15, 16) are delayed is eliminated.

If the lengthwise tension state remains unbalanced at both the left and right ends at the introduction portion to the spreading mechanism 3, the left and right wheels (15, 16) are respectively driven externally with the lengthwise tension. The peripheral speed is determined in consideration of the torque, and the peripheral speed is not the same on the left and right. However, in the cloth straightening machine according to the present embodiment, as described above, the tension balance control unit based on the detection result by the tension balance detection unit 2 6 to perform skew correction in the tension balance correction unit 1 via
Left and right drive motors (17, 18) since the lengthwise tensions at both ends of the fabric 19 at the introduction portion to the spreading mechanism 3 are balanced at the left and right and have the same peripheral speed at the left and right.
Right and left wheels (15, 1)
The same driving torque can be given to 6).

Needless to say, the apparatus may be slightly complicated, but a configuration may be adopted in which torque control by feedback is individually performed on the left and right drive motors (17, 18).

As described above, in the spreading-type cloth straightening machine according to the present embodiment, the tension balance at the left and right ends of the cloth introduced into the spreading mechanism is adjusted without applying overfeed when the cloth is introduced into the spreading mechanism. Since the skew correction can be completed before the cloth correction by spreading, and a certain amount of tension can be applied when the spreading mechanism is introduced, an effect of amplifying the self-correcting force of the cloth can be obtained.

Also, it is not necessary to perform re-correction with a bend bar or the like having a complicated shape as in the related art, and it is not necessary to perform re-correction by using a bend bar having a complicated shape in the spreading mechanism. Can be easily suppressed.

In the above embodiment, the case where the belt wheel type spreading mechanism is provided has been described. However, the spreading type cloth straightening machine of the present invention is not limited to this. For example, the pin wheel type spreading mechanism may be used. Needless to say, it is effective.

[0071]

As described above, according to the spreading-type cloth straightening machine of the present invention, when introducing the cloth into the spreading mechanism, good cloth correction can be performed without overfeeding. There is an effect that a belt-wheel-type spreading mechanism without the above can be adopted.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a spread-type cloth grain straightening machine according to one embodiment of the present invention.

FIG. 2 is a side view showing an arrangement of main components of the embodiment.

FIG. 3 is an explanatory diagram showing a flow of a signal for correcting curvature in the present embodiment.

FIGS. 4A and 4B are schematic configuration diagrams illustrating an example of a balance roll deflection amount measuring unit according to the present embodiment, wherein FIG. 4A is a schematic front view of the balance roll and the measurement unit, and FIG. FIG. 3 is an explanatory diagram viewed from substantially the upper surface side, and FIG. 3C is an enlarged schematic diagram of a gear meshing portion of FIG.

FIG. 5 is a schematic configuration diagram showing another example of a means for measuring a balance roll runout amount in the present embodiment.

[Explanation of symbols]

 1: tension balance correction section 2: tension balance detection section 3: spreading mechanism section 4: curved cloth detection section 5: cloth running speed detection section 6: tension balance control section 7: drive torque control section 10: dancer roll 11: correction roll 12: Balance roll 13: Left belt 14: Right belt 15: Left wheel 16: Right wheel 17: Left wheel drive motor 18: Right wheel Hisato motor 19: Fabric 20: Fabric travel path 21: Balance roll support bracket 22: Gear piece 23: (Potentiometer side) Gear 24: Potentiometer 25: Proximity switch

Claims (4)

[Claims] 1. A spreading-type cloth straightening machine provided with a spreading mechanism for spreading a long cloth fed in a length direction in a width direction, wherein the spreading cloth straightening machine is arranged at a position upstream of the spreading mechanism and immediately before being introduced into the spreading mechanism. Tension balance detecting means for comparing tension states in the length direction generated at both right and left ends of the cloth; and arranged at a position upstream of the tension balance detecting means, based on a result from the tension balance detecting means. And a tension balance correcting means for controlling the unwinding of the left and right ends of the cloth in a direction to offset the difference in the tensile load of the portions. 2. The spread-type cloth straightening machine according to claim 1, wherein the tension balance detecting means includes a balance roll having a swing center at a center position in a width direction of the cloth. 3. The spreading mechanism has a pair of wheels that hold the both ends of the fabric and rotate with the same driving torque while separating from each other in the fabric width direction to spread the fabric. The spread-type cloth straightening machine according to claim 1. 4. The spread-type cloth straightening machine according to claim 3, further comprising drive torque control means for controlling increase / decrease of drive torque of the pair of wheels.