JPH0234856B2 - HAKUTANBANNOTETSUSOSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveying device for thin veneers, and more specifically, a first conveyor for carrying a thin veneer on its upper surface for conveying thin veneers for forming decorative plywood, etc. The present invention relates to a thin veneer conveying device having a second conveyor that receives the thin veneer and conveys the thin veneer by adsorbing the thin veneer to its lower surface.

Conventionally, for products made by laminating thin veneers such as decorative plywood, in order to convey the thin veneers, in addition to the normal conveyor that carries the thin veneer on top, a thin veneer is used. A conveyor is used that adsorbs and conveys thin veneers on the bottom surface so that the boards can be dropped from above and stacked in order. In other words, of each conveyor that conveys thin veneers, a conveyor that sucks the thin veneer on the lower surface is installed at the end side in the direction of movement of the thin veneer, and the conveyor that places the thin veneer on the upper surface of the conveyor picks up the thin veneer. The veneer is delivered. By the way, the conveyor for sucking the thin veneer upward is configured so that the suction force acts uniformly along the width direction of the thin veneer. Therefore, when the thin veneer is transferred from one conveyor to the next conveyor, it is expected that the leading edge of the thin veneer will rise substantially simultaneously on a straight line along the width direction. However, in reality, when the thin veneer lifts up, the leading edge of the thin veneer is affected by the difference in hardness of the thin veneer on a straight line along the width direction of the thin veneer and the slight difference in air flow. They may not be completely adsorbed onto the conveyor at the same time, and as a result, the thin veneer may be adsorbed onto the conveyor in a wrinkled state. Once wrinkles occur, they are difficult to smooth out, and these wrinkles can cause cracks in the thin veneer and reduce the quality of the product.

The present invention was made in view of the above-mentioned problems, and its main purpose is to prevent the thin veneer from being wrinkled when it is transferred from conveyor to conveyor. It's about doing.

Embodiments of the present invention will be described below based on the drawings. The thin veneer conveying device according to the present invention includes a thin veneer 1
a first conveyor 2 that conveys in one direction with the
, a second conveyor 3 which receives the thin veneer 1 from the first conveyor 2 and conveys the thin veneer 1 by adsorbing it to the lower surface using suction force applied from above; and the first conveyor 2.
The guide plate 4 is equipped with a guide plate 4 that receives the thin veneer 1 sent from the terminal end on its upper surface and transfers the thin veneer 1 to the lower surface of the second conveyor 3. A large number of through holes 5 are formed for adhering the thin veneer 1 to the lower surface of the second conveyor 3 by applying a The number of lined through holes 5 gradually increases, and the thin veneer 1 that is sent onto the guide plate 4 and is sucked to the lower surface of the second conveyor 3 at one place in the width direction of the front edge at the rear end of the guide plate 4 becomes a guide plate. 4, the suction portion gradually expands from the portion initially suctioned by the second conveyor 3 to the remaining portion, and the portion of the thin veneer 1 that has passed through the guide plate 4 is covered over the entire surface. The second conveyor 3 is attracted to the lower surface thereof, and this embodiment shows an example in which the terminal end of the first conveyor 2 and the starting end of the second conveyor 3 overlap. As shown in Figure 1, thin veneer 1
Next to the first conveyor 2 which transports the thin veneer 1 by placing it on the upper surface, there is a second conveyor 3 which transports the thin veneer 1 by adsorbing it to the lower surface.
are arranged, and from the first conveyor 2 to the second conveyor 3
The thin veneer 1 is transferred to. The terminal end of the first conveyor 2 and the starting end of the second conveyor 3 overlap vertically. Both the first conveyor 2 and the second conveyor 3 have suction chambers 6, 7, and the conveyor belts 8, 9 of each conveyor 2, 3 are provided with suction ports 10 as shown in FIG. That is, the suction chambers 6, 7 are provided with a large number of suction ports 11 for creating a vacuum, and the conveyor belts 8, 9 are provided with a large number of suction ports 10 corresponding to each suction port 11. Each suction port 11 always corresponds to one of the suction ports 10, so that the thin veneer 1 is suctioned and held on the conveyor belts 8, 9. The suction chamber 6 of the first conveyor 2 and the suction chamber 7 of the second conveyor 3 do not overlap vertically, and moreover, the downward suction force from the suction chamber 6 of the first conveyor 2 acting on the thin veneer 1 disappears. At the same time, the arrangement is such that an upward suction force from the suction chamber 7 of the second conveyor 3 acts. In other words, the suction force is always exerted in either the upper or lower direction. A guide plate 4 is disposed at a position corresponding to the terminal end of the first conveyor 2 so as to face the lower surface of the second conveyor 3. The upper surface of the guide plate 4 is located on substantially the same plane as the upper surface of the first conveyor 2. As shown in FIG. 3, at the rear end of the guide plate 4 along the traveling direction of the thin veneer 1, an introduction piece 12 that slopes downwardly toward the rear is provided, and the thin veneer 1 is guided to the first conveyor 2. When the thin veneer 1 is placed on the guide plate 4, the thin veneer 1 is guided onto the guide plate 4. Projections 13 projecting upward are formed on both side edges of the guide plate 4 perpendicular to the conveying direction of the thin veneer 1, respectively. A large number of through holes 5 are bored in the bottom surface of the guide plate 4, and the thin veneer 1 is attracted to the second conveyor 3 by the atmospheric pressure received through the through holes 5. As shown in FIG. 3b, the through hole 5 has a semi-elliptical planar shape, the front edge of the through hole 5 is a straight line, and the rear edge is a curve. A tongue piece 14 extends downwardly from the front edge of the through hole 5 toward the rear to prevent the front end of the thin veneer 1 conveyed from the rear from getting caught in the through hole 5. Through hole 5
are arranged so that the number of the guide plates 4 arranged in the width direction gradually increases from the rear end to the front end of the guide plate 4. That is, at the rear end of the guide plate 4, the through hole 5 is formed only at the center in the width direction of the guide plate 4, and at the front end of the guide plate 4, the through hole 5 is formed over almost the entire length of the guide plate 4 in the width direction. are formed, and the through holes 5 are arranged within a substantially isosceles triangular range and at substantially the same intervals within that range.

The operation of the present invention will be explained. In the second conveyor 3, a substantially uniform suction force is exerted by the suction chamber 7 over the entire width of the conveyor belt 9.
However, the second conveyor 3 on which the guide plate 4 is arranged
At the starting end of the conveyor belt 9, the suction force acting between the guide plate 4 and the conveyor belt 9, that is, the atmospheric pressure acting perpendicularly to the surface of the conveyor belt 9, is determined by the amount of air flowing in through the through holes 5. , and becomes smaller as the distance from the through hole 5 increases. Therefore, at the rear end of the guide plate 4, the suction force is maximum at the center in the width direction of the guide plate 4 and decreases toward both sides, as shown in FIG. Thin veneer 1 is the first conveyor 2
When the thin veneer 1 is sent onto the guide plate 4, the front end of the thin veneer 1 is lifted above the air flowing in from the through hole 5 provided at the center of the guide plate 4 in the width direction at the rear end of the guide plate 4. Only the central portion in the width direction is attracted to the second conveyor 3. As the thin veneer 1 moves forward, the flow rate of air hitting the back surface of the thin veneer 1 increases, and the adsorbed portion gradually expands from the portion that was initially adsorbed by the second conveyor 3. In this way, the portion passing through the guide plate 4 comes into close contact with the second conveyor 3. As described above, the center of the thin veneer 1 in the width direction first comes into close contact with the second conveyor 3, and as it moves forward, the suction part expands as it is pulled toward both sides. As a result, the air between the second conveyor 3 and the thin veneer 1 is expelled, and the second conveyor 3 is removed without wrinkles forming on the thin veneer 1.
It can be adsorbed onto the conveyor 3. Furthermore, protrusions 13 are formed on both sides of the guide plate 4 in the width direction, and these protrusions 13 prevent air from flowing in from the sides of the guide plate 4 and prevent air from flowing from unnecessary directions. This prevents the thin veneer 1 from being affected.

As described above, the present invention gradually increases the number of through holes formed in the guide plate arranged in the width direction from the rear end toward the front along the traveling direction of the thin veneer. The thin veneer is fed and adsorbed to the lower surface of the second conveyor at a part in the width direction of the front edge at the rear end of the guide plate, and as it advances on the guide plate, the thin veneer is adsorbed from the part where it was first adsorbed by the second conveyor at the rear end of the guide plate. The suction part is gradually expanded to the remaining parts, and the entire part of the thin veneer that has passed through the guide plate is suctioned to the bottom surface of the second conveyor. The thin veneer is adsorbed, and the adsorption area to the second conveyor is expanded around that part, so that air does not enter between the second conveyor and the thin veneer, and the thin veneer is adsorbed to the second conveyor without wrinkles. It has the advantage of being

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention;
FIG. 2 is a partial perspective view of the same as above, FIGS. 3 a and 3 b are a perspective view of a guide plate used in the above, and a partial perspective view of the guide plate, respectively, and FIG. 4 is a partial sectional view of the same as above;
2 is a thin veneer, 2 is a first conveyor, 3 is a second conveyor, 4 is a guide plate, and 5 is a through hole.

Claims (1)

[Claims] 1. The first stage where a thin veneer is placed on the top surface and transported in one direction.
a conveyor, a second conveyor that receives the thin veneer from the first conveyor, adsorbs the thin veneer to its lower surface using suction force applied from above and conveys it; and a second conveyor that receives the thin veneer sent from the end of the first conveyor on its upper surface. The guide plate is equipped with a guide plate for moving the thin veneer to the lower surface of the second conveyor, and the guide plate has a transparent plate for adhering the thin veneer to the lower surface of the second conveyor by applying atmospheric pressure to the surface of the thin veneer. A large number of holes are formed, and the number of through holes lined up in the width direction gradually increases as the thin veneer moves forward from the rear end in the direction of travel. The thin veneer is attracted to the lower surface of the second conveyor at one point in the width direction of the edge, and as it advances on the guide plate, the suction portion is moved from the part that was first attracted to the second conveyor to the remaining part. A thin veneer conveying device characterized in that the thin veneer is gradually spread out and the entire portion of the thin veneer that has passed through a guide plate is attracted to the lower surface of a second conveyor.