JPH06273350A - Nappiness evaluation system for cloth - Google Patents

Abstract

PURPOSE:To provide a system for evaluating the nappiness on the surface of a cloth and deciding whether ink jet print can be applied thereto. CONSTITUTION:A carrier 2 for cloth 1 is provided and a supporting surface plate 4 stretching in the breadthwise direction of the cloth 1 in the carrying path of the cloth 1 comes into contact with the cloth 1 from below. A pair of detectors 3a, 3b for projecting light sideways to the cloth 1 on the surface plate 4 and receiving the light on the opposite side are disposed oppositely in the vicinity of the opposite ends of the surface plate 4. An evaluating section 5 evaluates the nappiness on the surface of the cloth 1 based on the output signals from the detectors 3a, 3b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for evaluating the fluffing condition of a fabric surface.

[0002]

2. Description of the Related Art Conventionally, a method and an apparatus disclosed in Japanese Patent Laid-Open No. 147348/1987 as an apparatus for evaluating the state of fluff on the surface of a yarn is a fiber product in the form of bread, cheese, corn or the like. The devices disclosed in Japanese Patent Laid-Open No. 64-13376 are known as devices for detecting the fluff protruding on the surface of each of the above.

The device disclosed in Japanese Patent Laid-Open No. 147348/1987 (hereinafter referred to as "conventional example 1") illuminates an elongated sample surface with a light emitter and receives only light from an illuminated edge of the sample surface. It is configured to be received by a vessel. That is, only the stray light diffused, scattered, reflected and refracted at the fluff portion protruding from the edge of the slender sample thread is received by the light receiver, and the number of fluff is detected from the intensity of the stray light.

The device disclosed in Japanese Patent Laid-Open No. 64-13376 (hereinafter referred to as "conventional example 2") irradiates the ridge line portion of the package from the rear side of the package and uses a video camera provided in front of the package. The ridge line portion is imaged to detect fluff.

[0005]

However, according to the method and apparatus of the prior art 1, the fluff existing at the edge of the surface of the sample to be illuminated is detected. If the object is a test object, the fluff existing on the surface can be detected, but for the test object having a wide width such as a cloth, it is impossible to detect the fluff existing on the surface other than the edge portion.

Further, in the above-mentioned conventional example 2, it is possible to detect abnormal fluff that is extremely high in both height and thickness of the fluff from the surroundings, but there are innumerable fluffs that are evenly present on the surface of the cloth such as cotton cloth. Can not be evaluated.

Usually, in printing on a cloth using an ink jet, it is necessary to maintain the distance (head gap) between the jet nozzle surface and the surface of the printed cloth to be 0.5 to 1.0 mm. This is because when the head gap becomes large, a slight inclination of the ink droplets ejected from the ejection nozzle in the flight direction (deflection) is enlarged, and the landing position on the fabric is displaced, resulting in incorrect reproduction colors or white stripes.・ Because it causes black stripes. On the other hand, when the head gap becomes small, the ejection nozzle surface comes into contact with the cloth, the cloth becomes dirty, and the ejection nozzle is broken, which is inconvenient. In particular, countless fluffs are present on the surface of the cotton cloth, and in the case of a high cloth, there are some that reach 1 mm or more, which is several times the thickness of the cloth. When this fluff comes in contact with the ejection nozzle surface, the flight direction of the ink droplets changes, or ink mist accumulates around the ejection nozzle, which spreads over the entire surface of the nozzle and clogs the nozzle, resulting in problems such as deflection and ejection failure. there were.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus capable of evaluating the state of fluff on the surface of a fabric and determining whether or not it is applicable to ink jet printing.

[0009]

SUMMARY OF THE INVENTION The present invention for achieving the above object includes a conveying device for conveying a cloth, and a conveying device which is in a conveying path of the cloth and is laterally stretched in the width direction of the cloth so that the cloth is conveyed downward. And a pair of support slabs that are in contact with each other and are disposed in the vicinity of both ends of the support slab in a mutually opposing state, and that the fabric on the support slab is irradiated with detection light from its side and received on the opposite side. The gist is that it is composed of a light projecting / light receiving type detector and an evaluation unit for evaluating the quality of the fabric surface from the output signal of the detector.

[0010]

According to the present invention, the cloth is conveyed by the conveying device via the supporting surface plate. At this time, since the support surface plate is pressed against the cloth from below, the cloth can be stably run without being displaced in the thickness direction. Further, the detection light emitted from the light projector passes through the upper surface of the cloth from the side of the cloth and reaches the light receiver. During this time, the detection light is modulated by the fluff, the modulated detection light is received by the light receiver, and the light receiver outputs the output signal to the evaluation unit.
The evaluation unit evaluates the state of fluff on the fabric surface from the input signal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, a fabric fluff evaluation apparatus according to an embodiment includes a fabric transporting device (2), a pair of a projector (3a) and a photoreceiver (3b), and an amplifier unit (3c) connected thereto. , Surface plate (4) and evaluation unit (5)
Consists of.

The carrying device (2) is provided with a cloth feeding section (2).
a) and a cloth winding portion (2d), and the cloth feeding portion (2a) is a feeding roller (2b) for feeding the wound cloth and a receiving portion (not shown) for receiving the feeding roller (2b). ) And a brake (2c) provided on the shaft of the feeding roller (2b). The cloth winding section (2d) includes a winding roller (2e) for winding the cloth, and a receiving section (not shown) for receiving the winding roller (2e).
It is composed of a variable motor (2f) which is connected to the shaft of the winding roller (2e) and drives the shaft.

As shown in FIG. 1, the surface plate (4) is provided between the cloth feeding section (2a) and the cloth winding section (2d) and abuts on the lower surface of the cloth to be conveyed. Is being pushed upwards. In addition, the upper surface of the surface plate (4) was formed into a convex shape, and in order to prevent the influence of frictional electrification, the surface was made smooth, and in order to have conductivity, the upper surface of the iron base material was plated with chromium. I used one.

The light projector (3a) and the light receiver (3b) are known light emitting / light receiving type sensors. As shown in FIG. 2, the light projector (3a) and the light receiver (3b) are opposed to each other. , Are arranged beside the surface plate (4). Then, as shown in FIG. 2, the light projector (3a) is installed so that the light emitted from the light projector (3a) passes through the upper part of the cloth on the top of the surface plate (4) and is received.

In this example, a visible light laser having a beam diameter of about 1 mm or less when the distance between the projector and the receiver is 0 to 300 mm is generated, and it is possible to determine the presence or absence of an object having a minimum diameter of about 8 μm. Also, depending on the amount of light received by the beam, 1 to 5v
The analog output signal of 1 is output via the amplifier unit (3c).

As shown in FIG. 3, the evaluation section (5) is
The D / D conversion means (5a), the average calculation circuit (5b), the comparison calculation circuit (5c), and the reference data storage section (5d). The A / D conversion means (5a) converts the analog voltage signal input from the amplifier unit (3c) into a digital value, and the averaging circuit (5b) includes the A
It receives an input from the / D conversion means (5a) and averages it over a predetermined time. Further, the reference data storage unit (5d) stores the thickness of the reference cloth from which fluff has been removed in advance as a digital value, and the comparison calculation circuit (5
In c), the value output from the averaging circuit (5b) is compared with the data stored in the reference data storage section (5d) to determine the quality of the inspection cloth and output it. In addition, the data stored in the reference data storage section (5d) includes the light projector (3a), the light receiver (3b), and the amplifier unit (3).
It is calibrated in advance so as to match the relationship between the light shielding amount (μm) in c) and the output voltage (1 to 5 V).

Next, the operation of the embodiment apparatus having the above configuration will be described. First, as shown in FIG. 1, the variable motor (2f) of the cloth winding section (2d) is driven to rotate the winding roller (2e) in the arrow A direction. As a result, the feeding roller (2b) of the cloth feeding portion (2a) is driven, and the cloth (1) is conveyed in the direction of the arrow A through the surface plate (4) and wound on the winding roller (2e). Taken,
At this time, since the feed roller (2b) is provided with the brake (2c), a predetermined tension is applied to the cloth (1). Then, the upper surface of the cloth (1) on the top of the surface plate (4) can be made smooth.

Then, the fluff existing on the surface of the cloth is inspected by the light projector (3a), the light receiver (3b), the amplifier unit (3c) and the evaluation section (5). Usually, the fluff (6) is uniformly present on the surface of the fabric (1), and the thickness thereof is about 20 to 30 μm and the length is about 200 to 1000 μm. As shown in FIG. 2, when the fluff (6) crosses the laser light (7) one after another when the cloth (1) is conveyed in the direction of arrow B at a constant speed, the laser emitted from the projector (3a). The light is modulated and reaches the light receiver (3b). That is,
The passing fluff (6) partially blocks the laser light, and the amount of laser light reaching the light receiver (3b) is reduced. As a result, the amount of laser light reaching the light receiver (3b) varies depending on the amount of fluff, and the voltage signal output from the amplifier unit has a distorted waveform.

Then, the voltage signal output from the amplifier unit (3c) is supplied to the A / D conversion means (5a).
The digital value is converted into a digital value, and the average value calculation circuit (5
According to b), the average value for each predetermined time is calculated from this digital value. Then, the comparison calculation circuit (5c) compares the data from the average value calculation circuit (5b) with the data of the reference data storage unit (5d), and the amount of fluff present in the fabric is larger than the reference. To determine whether it is low or low.

In this way, the fluff present on the fabric surface can be continuously evaluated.

As shown in FIG. 4, the evaluation section (5)
To the A / D conversion means (50a) and the standard deviation calculation circuit (50
b) and may be comprised.

[0022]

As described in detail above, according to the present invention,
It is possible to evaluate the fluff state on the entire fabric surface for determining whether or not inkjet printing is possible, which could not be conventionally evaluated.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a test cloth and a beam.

FIG. 3 is an explanatory diagram showing an operation of an evaluation unit.

FIG. 4 is an explanatory diagram showing an operation of an evaluation unit in another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cloth 2 Transport device 3a Light projector 3b Light receiver 3c Amplifier unit 4 Surface plate 5 Evaluation section

Claims (1)

[Claims] 1. A transport device for transporting a cloth, a support surface plate that is in the transport path of the cloth, is horizontally stretched in the width direction of the cloth, and abuts against the transport cloth from below, near the both ends of the support surface plate. From a pair of light-projection / light-receiving type detectors, which are arranged in a state of being opposed to each other, emit detection light from the side of the cloth on the supporting surface plate and receive light on the opposite side, and an output signal of the detector A fluffiness evaluation apparatus for a fabric, comprising an evaluation unit for evaluating the quality of the surface of the fabric.