JPS60236008A - Device for inspecting object - Google Patents

Abstract

PURPOSE:To detect easily the presence or absence of creases of paper sheet by irradiating with a light source from the upper part slantwise at right angles to a transferring direction on the unprinted surface of paper sheet to be transferred and by detecting the reflecting light with a photodetecting element provided just above. CONSTITUTION:A printed paper sheet 11 is transferred to an arrow direction with a printing roll 14, 15 on a rail 12, 13 so as to make the printed side down sided and the unprinted side upper sided. The paper sheet is irradiated at the position of its passing through the roller 14, 15 with a light source 21 provided on the upper part slantwise and the reflecting light is detected with a photodetecting element 22 provided just above the middle of the rails 12, 13. When creases 16 are generated on the paper sheet 11, the shade generated due to the creases is detected by the photodetecting element 22 as non-continuance of the reflecting light. The creases caused on the surface of the paper sheet are thus detected surely. It is suitable for manufacturing paper packs of juice, milk, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an object inspection device that is particularly useful in detecting wrinkles that occur during the production of paper/packs such as milk and juice.

[Technical background of the invention and its problems]

This type of paper flat is manufactured by the following process.

(1) Blank paper leaf (about 100 anX 100 ty
B) Feed into the f printing press.

(2) A printing machine prints several sheets of paper simultaneously on one side of the sheet.

(3) Cut the paper/gutsuku from the paper sheet one by one.

(4) Make a crease.

(5) Fold along the crease and then glue to complete the paper/yatsuku.

By the way, the above printing step (2) is performed as shown in FIG. The paper sheet y1 is conveyed on the conveying rails 12.degree. 13 in the direction of the arrow shown in the figure and inserted between the printing rollers 14,15. When passing between these printing rollers 14 and 15, a paper pack is printed on the back side of the paper sheet 11. Wrinkles 16 may appear on a part of the surface of the plate. If paper packs are manufactured using paper sheets 11 with kernel wrinkles J6, if contents such as milk ooze out from the wrinkles, or if wrinkles are located on the adhesive surface of the paper/pack, the adhesion may fail. However, there was a problem in that the contents were completely leaked.

For this reason, conventionally, workers visually inspect paper sheets after printing has been completed, but it has been difficult to reliably detect wrinkles.

[Purpose of the invention]

This invention was made based on the above circumstances, and its purpose is to provide an object inspection device that can reliably detect distortions such as wrinkles that occur on the surface of an object. be.

[Summary of the invention]

This invention irradiates the surface of an object with light from an oblique direction (approximately perpendicular to the wrinkles) to create a shadow where the wrinkles are distorted, and this reflected light is detected by a light receiver. It detects distortions such as wrinkles from the detection output signal.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, on the delivery side of the printing rollers 14 and 15, there are
A light source 21 is provided obliquely above in a direction perpendicular to the conveying direction of the paper sheet 11. This light source 21 causes the paper sheet 11 to
When light is irradiated onto the surface of the wrinkle 16, a shadow can be produced on the wrinkle 16.

That is, the 16 wrinkles that occur on the sheet 11 of the printing roller 14.1
5, this occurs only in the direction along the conveyance direction. When this wrinkle 16 is irradiated with light by the light source 21 disposed at the above position, as shown in FIG. The difference is that brightness and darkness occur between the wrinkles 16 and the surface of the paper sheet 11. These reflected lights are received by a light receiver 22 disposed above the paper sheet 1, and the wrinkles 16 and other portions are converted into electrical signals of different levels by the light receiver 22.

FIG. 4 shows a signal processing circuit, and the same parts as in FIG. 2 are given the same reference numerals. The light receiver 22 includes, for example, a condenser lens 22□ and a CCD line image sensor 222. This CCD line image sensor 22
．． A drive signal is supplied from the drive circuit 23, and the charge accumulated in the CCD line image sensor 222 is taken out by this drive signal. This CCD line image sensor 222 scans the paper sheet 11 in a direction perpendicular to the conveyance direction, and the output signal of this image sensor 222 is supplied to a sample and hold circuit 25 via an amplifier 24. The sample and hold circuit 25 outputs a signal whose base level is adjusted to a predetermined value as shown in FIG. 5(a). Here, Sl is a signal corresponding to wrinkles. This Sansol hold circuit 2
The output signal of 5 is fed to a high pass filter (HPF) 26. From this high-pass filter 26, as shown in FIG.
A differentiated signal is output as shown in b). This signal is vl.

■! Binarization circuit 2 with empty slice level set
7, and both slice levels Vl, V! It is binarized by Figure 5(c) shows the slice level v
This is a signal that has been binarized by lK, and (d) in the figure is a signal that has been binarized by slice level v2. The output signal of this binarization circuit 27 is sent to the digital signal processing circuit 2.
8. In this digital signal processing circuit 28, in response to the drive pulse signal output from the drive circuit 23, a blanking mask signal (FIG. 5, 1
) is generated, and the AND of this blanking mask signal and the binarized signal is taken. As a result, the digital signal processing circuit 28 outputs the signal as shown in FIG.
g) Since a signal corresponding to wrinkles is output as shown in K,
At least one of these signals is output
The occurrence of wrinkles can be detected.

9- According to the above embodiment, light is irradiated on the surface of the paper sheet 11 from an oblique direction to create a shadow at the wrinkles, and this reflected light is transmitted to the CCD line image sensor 22! A signal corresponding to wrinkles is detected from this light reception output signal. Therefore, wrinkles can be detected more reliably than by visual inspection.

In addition, CCD line image sensor 22! from paper leaf 11
Since the signal is periodically extracted according to the conveyance of paper sheet 1,
If there is a wrinkle in the 1, the digital signal processing circuit 28 continuously outputs signals as shown in FIGS. 5(r) and 5(g) at the same position.

Therefore, if the position of this signal is determined by, for example, counting the driving/pulse signals, and similar signals are continuously present at the same position, it is determined that wrinkles are occurring, and wrinkles can be more reliably removed. can be detected.

Further, although the above embodiment uses one light source, the light receiver 22
If a systematic illumination/reception system 10 is further provided at a position symmetrical to the light source 2 with respect to the optical axis of the system, and the high-pass filter 26 is removed, it is possible to further distinguish between wrinkles and dust. . That is, when two optical systems are provided in this way, the signals corresponding to wrinkles will be as shown at 81 in Fig. 6 (a) and (b), but in the case of dust etc., the signals will be as shown at 81 in the same figure. The signal is different from that of wrinkles. Therefore, it is possible to distinguish between wrinkles and dust based on the difference in signal waveform and the continuity of the signal.

Furthermore, in the above embodiment, wrinkles are detected while the paper sheet is being transported by the transport device, but it is not necessarily necessary to use the transport system, and the image may be taken while the paper sheet is fixed. In this case, the light sources may be placed in a symmetrical direction with respect to the optical axis of the light receiver, emit light alternately, and the reflected light may be imaged by the same light receiver.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to provide an object inspection device that can reliably detect distortions such as wrinkles generated on the object surface.

[Brief explanation of drawings]

Fig. 1 is a schematic perspective view shown to explain the printing authority of a paper sheet, Fig. 2 is a schematic perspective view related to this invention and shows an example of the arrangement of a light source and a light receiver, and Fig. 3 is a schematic perspective view showing an example of the arrangement of a light source and a light receiver. FIG. 4, a diagram shown to explain the relationship between incident light and reflected light, is related to the present invention, and FIGS. FIG. 3 is a waveform diagram shown for explaining the operation of the diagram. 1. Object (paper leaf), 16. Distortion (wrinkle), 2.
1... Light source, 22... Light receiver, 22! ...CCD
Line image sensor, 26... high pass filter,
27... Binarization circuit, 28... Digital signal processing circuit. Applicant's agent Patent attorney Takehiko Suzue Procedural amendment written June 1982. J? 8th Japan Patent Office Commissioner Kazuo Wakasugi 1, Indication of the case Patent Application No. 59-93187 3, Person making the amendment Relationship with the case Patent applicant (307) Toshiba Corporation 4, Agent 5, Voluntary amendment A-

Claims (1)

[Claims] (1) A light source that irradiates light onto an object, a light receiver that receives reflected light from the object, and a signal processing means that detects distortion on the surface of the object based on the output signal of the light receiver. An object inspection device characterized by comprising: (2) The object inspection device according to claim 1, wherein the light source irradiates the object surface with light from an oblique direction. (3) The object inspection device according to claim 1, wherein the object is a paper sheet. (4) The object inspection apparatus according to claim 1, wherein the signal processing means detects wrinkles on the surface of the object. (5) The paper sheet is printed on one side, and the light source and light receiver emit light to the non-printed side of the paper sheet and receive reflected light. An object inspection device according to claim 3. (6) The object inspection device according to claim 3, wherein the paper sheet is inspected before making creases in the paper sheet. (7) The object inspection device according to claim 1, wherein the light receiver is a line image sensor. (8) The object inspection device according to claim 1, wherein a plurality of the light sources are arranged at symmetrical positions with respect to the optical axis of the light receiver. (9) Inspection of an object according to claim 4, wherein the signal processing means determines wrinkles when the same signal is continuously detected at the same position in the same direction as the transport direction of the object. Device. 01. The object inspection device according to claim 1, wherein the light source irradiates light and sound at least two directions opposite to each other with respect to the optical axis of the light receiver, with time or position being shifted. a) A transport means for transporting an object, a light source for irradiating light onto the object transported by the transport means, a light receiver for receiving reflected light from the object, and an output signal from the light receiver for detecting the surface of the object. 1. A device for inspecting an object, comprising: signal processing means for inspecting distortion. [alpha] An object according to claim 11, wherein the light source irradiates the object from an oblique direction with respect to the transport direction of the object, and the light receiver scans the reflected light in a direction perpendicular to the transport direction. inspection equipment. o3 The object inspection device according to claim 11, wherein the object is a paper sheet. 04. The object inspection apparatus according to claim 11, wherein the signal processing means detects wrinkles on the surface of the object. αυ The paper sheet is printed on one side, and the light source and light receiver emit light to the non-printed side of the paper sheet and receive reflected light. An inspection device for an object according to claim 13 of the patent application. 00 The object inspection device according to claim 13, wherein the inspection of the paper sheet is performed before making creases in the paper sheet. Oη The object inspection apparatus according to claim 11, wherein the light receiver comprises a line image sensor. 0→ Claim 11, characterized in that a plurality of the light sources are arranged at symmetrical positions with respect to the original axis of the light receiver.
Inspection device for the objects described in Section 1. (19) When the signal processing means detects the same signal at the same position in the same direction as the conveying direction of the object, it is determined to be wrinkled. Inspection device.(1) The light source emits light from at least two opposite directions with respect to the optical axis of the light receiver with time or position shifted. Inspection equipment.