JPS5876706A - Knife mark checking method and knife mark checking machine - Google Patents

Abstract

PURPOSE:To ensure the checking of the knife mark, by alternately changing the light projecting directions to a single slice plate. CONSTITUTION:The belt shaped projected light is inputted to the single slice plate 1 from a light projector 2. Another light projector 2A is provided at a plane symmetrical position with respect to the light projector 2, with a plane which is perpendicular to the incident part as a center. The light is alternately projected to each sngle slice plate 1, which is sequentially sent continuously, from both light projectors 2 and 2A. The reflected light of the projected light is received and detected by a light receiver 3, and the knife mark X is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a knife mark inspection method and a knife mark inspection machine for detecting knife marks that occur on the surface of a sliced veneer due to slicing blade spills, foreign matter clogging, etc. .

Figure 1 shows a conventional knife mark inspection machine, in which a belt-shaped light is projected onto the conveyance path of the sliced veneer (1).
The projector (2) is arranged so as to illuminate the object at a shallow angle, and a life-shaped light receiving section is placed directly above the part where the band-shaped light emitted from the projector (2) enters the surface of the sliced veneer f11. A photoreceiver (3) is arranged. Here, the light receiver (3) is composed of a first slit plate (4), a second slit plate (5), a second slit plate (5), and a light receiving element (7) such as a photomultiplier tube. The reflected light from the linear incident part where the projected light enters the sliced veneer (1) is made to enter the light receiving element (7) over its entire length. Thus, in this conventional knife mark inspection machine, while the sliced veneer (1) is being conveyed one after another, the light receiver (3) detects the slices of the band-shaped light emitted from the light emitter (2). The light reflected from the surface of the square (11) is received, and the knife mark X is detected based on the change in the amount of received light.

However, in such a conventional example, the symmetry f! as shown in FIG. In the case of cross-sectional knife mark X, the same figure (b
), it is possible to obtain reflected light with an increased brightness level, making it possible to accurately detect the knife mark X.
Even in the case of a knife mark X having a cross-sectional shape with a deep cut on the female light side as shown in (b) of the same figure, the knife mark X can be detected due to the brightness and the rise of the bell as shown in (b) of the same figure. , in the case of a knife mark
As shown in b), the -F increase in the luminance of the reflected light is extremely small, making it extremely difficult to detect the knife mark X.

-1 was provided in view of the above point, and when a knife mark occurs on a sliced veneer flowing on Koshibear, a sliced veneer with a knife mark of the same shape as this knife mark will be removed. It is possible to reliably detect the occurrence of knife marks without missing them by a simple method of alternating the direction of the light emitted to the single slice, knowing that the knife mark will always fall, and it has a simple structure. The object of the present invention is to provide an inexpensive knife mark inspection method and knife mark inspection machine.

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

FIG. 5 shows a perspective view of the embodiment of the present invention, which is different from the conventional device shown in FIG. Another light emitter in plane symmetry with the above emitter (2) as the center:! :+ (2A
), and place the sliced veneer f1) in the direction of transport.
), respectively, a floodlight (2) and (2A
) are placed so that both floodlights (2)
The reflected light of the strip-shaped light projected from (2A) on the surface of the slice single plate il+ can be received by a single light receiver (3) having the same configuration as the conventional example. Thus, in the above embodiment,
The light projectors (2) and (2a) are arranged to emit light alternately to each slice veneer i11 that is sent in succession, and the light reflected by this light projection is received and detected by the light receiver (3). The knife mark X is then detected. Generally, if a knife mark X occurs on one slice veneer (+), a knife mark X of the same shape will also occur on the next slice veneer (1), so if a knife mark In the first slice with X (fl), the direction of the band-shaped light from the projector (2) or (2a) does not match the cross-sectional shape of the knife mark X on the slice veneer tl+, and the knife mark Even if a detection error of X occurs, the next slice transferred * & il)
, the projector (2) (2A) in the projecting state is switched, and the band-shaped light emitted from the projector (2A) or (2) matches the cross-sectional shape of the knife mark X, ensuring detection of the knife mark X. This allows the occurrence of the knife mark X to be accurately detected without substantially causing detection errors.

As mentioned above, the "misfire" is simply a matter of using two projectors to alternately emit light for each sliced veneer that is sent sequentially, so it is a simple method of simply switching the light emitted from the projectors alternately. With this method, even knife marks having deep cuts in the transport direction or reverse transport direction of the sliced veneer can be reliably detected.

Furthermore, since the second device is configured as described above, errors in detecting knife marks can be eliminated by essentially adding one projector to the conventional device, and the projection Since only two light sections are used and one light receiver is shared, the installation space for the device can be reduced, and the cost of the device can also be reduced.

[Brief explanation of drawings]

Figure 1 is a perspective view of the conventional example, Figures 2 to 4) (b)
Figure 5 describes the detection operation of knife marks having different cross-sectional shapes.An enlarged cross-sectional view of the slice fit 'I* and the light receiving brightness level of the receiver. In the figure, (1) is a slice single tank, f2
1 (2A) is a light emitter, (3) is a receiving beam, and an X-shaped knife mark. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] +1+ A strip-shaped light beam is irradiated onto the sliced veneer at a shallow angle from a projector on the transfer path of the sliced veneer, and is placed directly above the point where the strip-shaped light is incident on the sliced veneer. The reflected light enters the life-like light receiver, and the light is transmitted alternately to each sliced veneer that is sequentially sent from the projectors placed in front of and beyond the receiver in the direction of transport of the sliced veneer. A knife mark inspection method characterized in that the knife mark is detected by emitting light from both of the projectors, and receiving the reflected light from the light projectors by the light receiver, thereby detecting a knife mark based on a change in the amount of received light. (2) A projector is placed on the transport path of the sliced veneer, and a strip-shaped light is irradiated onto the sliced veneer at a shallow angle, and a life pattern is placed directly above the incidence 156 of the strip-shaped light onto the sliced veneer. In a knife mark inspection machine that detects knife marks by detecting changes in the amount of light incident on the light receiver, a light projector is installed in front and behind the light receiver in the sliced veneer transport direction. A knife mark inspection machine characterized in that it is provided with a light receiver that receives and detects the reflected light that is alternately projected from both of the light projectors for each sliced veneer that is sequentially sent.