JPH06228861A - Device for detecting damaged part of sheets - Google Patents

Abstract

PURPOSE:To eliminate false detection and to raise reliability of detection in discovering damages, stains and other injuries of sheets during transportation of the sheets. CONSTITUTION:A device detects damages, stains and other injuries of sheets by monitoring while spreading and transporting a sheet S. A recognition plate 11 which has a color in light and darkness correlation for making the sheet S prominent on the surface and is longer than the width of the sheet S is laid between the sheet S and a transporting means 12 for conveying the sheet and a guide pawl 13 for introducing the sheet S sent by the transporting means 12 to the recognition plate 11 is attached to the front edge of the recognition plate 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting breakage, stains, etc. of sheets during transportation by monitoring the sheets in the width direction while transporting the sheets or cover while spreading them. is there.

[0002]

2. Description of the Related Art For example, it is conventionally known to monitor a sheet conveyed on a conveyor with a camera from above in order to remove defective products in the course of washing, ironing, and folding a sheet. However, in the conventional monitoring system, the boundary between the conveyor and the both sides of the sheet is ambiguous, so that it is difficult to identify the boundary, and the actually effective monitoring area is limited to the inside of both sides of the sheet. FIG. 7A and FIG. 7B show the video signal during the measurement, but it can be seen that both sides p and q of the sheet are disturbed and it is difficult to specify the sheet width. In order to prevent this, we dyed the conveyor,
Staining may soon be discolored or cotton dust may be attached to reduce the color difference, and in some cases, the sheets may be soiled. The reflection r from the seam metal of the conveyor belt also becomes noise.

Furthermore, even if the sheet is torn and is detected, it is corrected by the influence of the reflection of the conveyor belt, causing a problem that the signal does not drop to the output reference for judging the presence or absence of damage (see FIG. 7 ( b) t).

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object of the present invention is to detect damage such as breakage or stain of sheets in a clear manner over the entire width of the sheets. The goal is to prevent oversights and false detections and increase reliability.

[0005]

In order to solve the above-mentioned problems, the present invention detects breakage or stain of sheets during conveyance by monitoring the sheets while the sheets are spread and conveyed. In the apparatus, a strip-shaped identification plate 11 having a coloring in a light-dark relationship that makes the sheets conspicuous on the surface and longer than the width of the sheets is installed so as to overlap with the conveying means 12 for conveying the sheets. The guide claw 13 for guiding the sheets conveyed on the conveying means 12 onto the identification plate 11 is provided so as to project from the front edge of the identification plate 11 toward the conveying means 12. It is a thing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The detector 10 shown is an ironer 9
It is arranged in the subsequent stage, and is provided by utilizing the entrance portion of the folder 20 that folds while conveying the sheets S. Therefore, the transporting means 1 for spreading and transporting the sheets S
2 communicates with the folder 20, and the illustrated transporting means 12 is composed of a belt conveyor in which multiple strips 12a are arranged side by side in the width direction (see FIG. 4).

An identification plate 11 is installed on the upper surface of the front half of the conveyor in a direction orthogonal to the carrying direction. The identification plate 11 is made of a rigid plate material formed in a strip shape having a length longer than the width of the sheets S, preferably a length that exceeds the entire width of the conveying means 12, and a required width in the moving direction of the sheets S. The surface (upper surface) is colored to make the sheets stand out. Given that the color of the sheets S is often white or a light color close to it,
The coloring 11a of the identification plate 11 is black or a dark color close to black, or blue, green, brown or the like is suitable. On the contrary, when the sheets S are of a dark color system, the coloring 11a of the identification plate 11
Needless to say, is a light color system. In short, make the sheets stand out by making a difference between light and dark.

In order to pass the sheets S onto the identification plate 11 as described above, a guide claw 13 that acts to scoop up the sheets S is provided at the front edge portion of the identification plate 11. The illustrated guide claw 13 is provided so that the tip portion thereof is located in the space 12b between the conveyor belts, and is lifted obliquely rearward therefrom and smoothly connected to the upper surface of the identification plate 11 (see FIG. 4). Such a guide claw 13 does not have to have the illustrated shape, and may have a structure in which the front edge of the identification plate 11 is partially extended forward, but another member is attached to the upper surface of the identification plate 11. If the guide plate is used, the guide nail itself is colored in the same color as the identification plate 11.

Illumination means 14 for illuminating the sheets S is provided in the monitoring range along the identification plate 11. Since the illuminating means 14 illuminates a monitoring range corresponding to almost the entire identification plate 11, the high-frequency fluorescent lamps 14a and 14b arranged over the entire width of the conveyor are provided substantially parallel to the front and rear of the conveying direction. Become. The illuminating means 14 is not limited to the above-mentioned portion, but can be appropriately increased, for example, by providing a fluorescent lamp 14c that particularly illuminates the left and right side portions of the sheets S as shown in FIG. The fluorescent lamp provided with a high-frequency oscillator (inverter) is used as the illumination means 14 in order to stabilize the brightness of the monitoring area, but this also improves the life. In addition, since the monitoring area is illuminated from the front and rear and from the left and right, the area is made non-shadowed, and it is possible to eliminate the possibility that a slight wrinkle or unevenness of the sheet creates a shadow and misidentifies it as a defective portion.

An image sensor is provided above the monitoring area as a means 15 for detecting the abnormal state of the sheets S.
The detecting means 15 is composed of a plurality of CCDs 15a, 15b, ... Which are arranged in parallel in the width direction of the sheets S, and their respective fields of view are arranged so that their ends overlap, and the total of all CCD fields of view θ is the entire width of the sheets. Full inclusion (see Figures 1 and 5). Reference numerals 16a and 16b denote data processors to which the output signal from the detecting means 15 is input.
a and 16b are not limited to the processing of the detection information, but the detection conditions such as 1. Size of damage, 2. Number of breaks, 3. It is used to set the monitoring area and control the end of detection work. Reference numerals 17a and 17b denote sensors for detecting the front end and the rear end of the sheets S, and 18 denotes a sequencer for outputting an abnormality detection signal to the canceling controller 19.

When the sheets S are applied to the detection device 10 as described above, the sensor 17a confirms the entry, the sensor controller 21a issues an instruction to start the detection, and the data processors 16a and 16b follow the set detection conditions.
The image sensor monitors the output of the image sensor, and the output of the image sensor is sent to the sequencer 18 through the relay of the sensor controller 21b. The sensor 17b confirms that the sheet S has exited.

During this time, if it is detected that the sheets S have any abnormality such as damage or stain, the sensor controller 21b.
A cancel signal is output from the sequencer 18 to the sequencer 18, and the cancel controller 19 issues a voice instruction to the effect of "cancel the defective product". The video signal of the detection result is shown in FIGS. 6 (a) and 6 (b).
As shown in FIG. 6A, the sheets S are clear over the entire width, and if there is a breakage, the signal T indicating it is also sufficiently sharp and sufficiently satisfies the output standard.

[0013]

As described above, in the detection device according to the present invention,
Since the identification plate 11 for making the sheets S stand out is arranged above the conveying means 12, and the sheets S are configured to get over the identification plate 11 by the guide claws 13, the surface of the sheets S is the identification plate 11. Both sides of the sheets S can be clearly discriminated while being conveyed while being contrasted with light and dark. Therefore, the entire width of the sheets S can be monitored, and abnormalities such as surface damage and stain of the sheets can also be clearly discriminated. can do. Furthermore, when the illumination means 14 illuminates along the monitoring range, the difference in brightness between the sheets S and the identification plate 11 is conspicuous, so that the identification ability is further enhanced.

[0014]

According to the present invention, when detecting abnormalities such as breakage and stain of sheets, the monitoring range can be clearly performed over the entire width of the sheets, and at the same time, sufficient difference in light and darkness on the damaged portion can be obtained. Since the abnormal condition can be detected clearly, the abnormal condition is not overlooked or erroneously detected, the reliability is enhanced, and the sheets can be efficiently inspected.

[Brief description of drawings]

FIG. 1 is a front view of a folder incorporating a detection device according to an embodiment of the present invention.

FIG. 2 is a side view for explaining the folder of the same.

FIG. 3 is an explanatory plan view of a main part of the device of the present invention.

FIG. 4 is a perspective view of the above.

FIG. 5 is a block diagram of a control mechanism of the same apparatus.

FIG. 6 (a) is a graph showing a waveform of an output signal according to the present invention. (B) A graph showing the abnormal signal waveform.

FIG. 7A is a graph showing a waveform of an output signal according to a conventional method. (B) A graph showing the waveform of the abnormal signal waveform.

Claims (3)

[Claims] 1. An apparatus for detecting breakage, stains, etc. of a sheet during transportation by monitoring the sheet while spreading the sheet and transporting the sheet so that the sheets have a light and dark relationship. A strip-shaped identification plate 11 having a certain coloring on the surface and longer than the width of the sheets is installed so as to overlap with the transporting means 12 for transporting the sheets, and the sheets transported on the transporting means 12 are identified. A guide claw 13 for guiding onto the plate 11 is conveyed from the front edge of the identification plate 11 to the conveying means 12.
A device for detecting a damaged portion of a sheet, which is provided so as to project toward. 2. A shadowless illumination means 1 for illuminating sheets and identification plates 12 in the same range in a monitoring range along the identification plate 11.
4. The apparatus for detecting a damaged portion of sheets according to claim 1, wherein a high-frequency fluorescent lamp is provided as the illuminating means 14, and the fluorescent lamp is installed substantially parallel to the identification plate 12 and before and after the conveying direction. 3. A means 15 for detecting breakage, stains, etc. of sheets and the like is an image sensor, and a plurality of detection means 15 are arranged in a monitoring range along the identification plate 2 and their visual fields partially overlap. An apparatus for detecting a damaged portion of sheets according to claim 1.