JPS5912442B2 - Curl straightening machine for veneer veneer with automatic adjustment device - Google Patents

Description

Detailed Description of the Invention (Object of the Invention) The present invention aims to eliminate new surface cracks by pressing and bending a veneer veneer with curls caused by back cracks cut by a veneer lace in the opposite direction with a small radius of curvature. This invention relates to an improved curl straightening machine for veneer veneer for carrying out a method of straightening curls to a substantially flat surface by generating and balancing back cracks during cutting. The degree of curl caused by back cracking during cutting differs significantly depending on the species and material of the raw wood cut by veneer lace, and the degree of curl caused by cracking on the back during cutting differs significantly. Some veneer veneers do not require curl correction, and in most cases, punky veneer veneer is cut from the center of the log, whereas strong veneer veneer is cut from the outer periphery of the log. If this method is carried out as it is by means of pushing and bending in the opposite direction with a specific radius of curvature that has been adjusted for the purpose, there is a serious problem in that the material quality of the veneer veneer is significantly damaged and the yield of the product is significantly reduced. Instead, veneer veneers of various thicknesses are often cut from a single raw wood under continuous operation. Since there was an inefficient process operation in which the operation was stopped and readjusted, an automatic adjustment device that can arbitrarily and steplessly change the degree of curl correction during operation was developed to meet this type of need. The purpose of this invention is to provide a veneer veneer curl straightening machine equipped with the following functions.

(Structure of the Invention) As shown in an embodiment of the present invention, a small curvature radius member 1, for example, a diameter 1
A lower conveyor belt 2 made of nylon, comb, etc. is wrapped around a small curvature radius member 1 made of a rotating roll of about 0 to 40 mm or a synthetic resin sliding body with a similar radius of curvature, and fixed pulleys 3, 4, so that the upwardly curled veneer veneer 5 discharged from a veneer lace or the like is continuously carried in.

Further, the small curvature radius member 1 or the lower conveyor belt 2
An upper conveyor belt 6 made of nylon, rubber, etc. is wrapped around the outer periphery of the conveyor belt 6, which is made of nylon, rubber, etc., with the veneer veneer 5 in between.

Furthermore, the support arm 11a of the vibrating pulley 9. One of the supporting arms 11b includes a reciprocating mechanism 12, for example, a power cylinder that rotates a screw 12 shape with a motor 12b to expand and contract.
Alternatively, a reciprocating mechanism 12 consisting of a hydraulic cylinder, a pneumatic cylinder, etc. that can be controlled in a fixed position is connected, and the vibrating pulley 9 is vibrated obliquely from above and below with the fixed pulley 7 side as a supporting axis. The pushing and bending curvature of the suspended upper conveyor belt 6 can be changed freely, that is, the upper conveyor belt 6 wound around the vibrating pulley 9 can be wrapped around the small radius member 1 side with an obtuse pushing and bending curvature, or an acute bending curvature. It is constructed so that it can be pressed, bent, and wrapped at any desired curvature.

Incidentally, depending on the degree of winding of the upper conveyor belt 6 around one of the support arms 11a and 11b, the curvature of the actual pressing and bending of the veneer veneer 5 against the small radius of curvature member 1 changes significantly. Since the degree of curl correction changes significantly depending on whether surface cracks are formed in the veneer veneer 5 in large numbers or in small numbers, an indicator 13 is provided to indicate the degree of curl correction by displaying the vibration angle of the vibrating pulley 9. This makes automatic operation even easier while driving.

In addition, the conveyor belt 15 wrapped around the fixed pulley 14 is
This is a conveyor device for conveying the curled veneer veneer to the subsequent process, and if necessary, a reflective limited distance photoelectric sensor is used to detect changes in the loop amount of the veneer veneer falling onto the conveyor device. By detecting it with switches, resolvers, etc. and automatically controlling the unloading speed, it is possible to avoid problems caused by speed differences caused by differences in veneer elongation due to changes in wood species, material, and thickness. .

(Effects of the Invention) Since the present invention is a veneer veneer curl straightening machine equipped with an automatic adjustment device configured as described above, the degree of curl straightening can be arbitrarily and steplessly changed during operation. The present invention has a new function that allows for the straightening of veneers, making it possible for the first time to continuously perform curl straightening methods to any degree depending on the wood species, material, and thickness, which was completely impossible with conventional equipment. This invention has an implementation effect that greatly contributes to improving the product yield and quality of the product, and also greatly contributes to improving process efficiency.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, in which Fig. 1 is a side view, Fig. 2 is a plan view, Fig. 3 is an explanatory diagram when the pressing bending curvature is made at an acute angle, and Fig. 4 is the same. It is an explanatory view when it is made into an obtuse angle. 1...Small curvature radius member, 2...Lower conveyor bell), 3, 4, 7, 8...Fixed pulley, 6...Upper conveyor belt , 9...
Vibrating pulley, 11a. 11b... Support arm, 12... Reciprocating mechanism.

Claims (1)

[Claims] 1. A lower conveyor belt is wound around a small radius member with a small radius of curvature projected at the tip in the conveyance direction, and the lower conveyor belt is further suspended on a fixed booth, and a lower conveyor belt is located on the upper outer peripheral portion of the small radius member with a small radius of curvature. On the outer periphery of
A part of the upper conveyor belt is wrapped around the upper conveyor belt, and the upper conveyor belt is further suspended from a fixed booth and a vibrating booth having a supporting arm attached to the fixed booth so as to be able to freely vibrate, and the supporting arm of the vibrating booth is used to reciprocate. Curl correction of veneer veneer is also provided with an automatic adjustment device characterized in that an operating mechanism is connected to the upper conveyor belt suspended on the vibrating booth so that the pushing and bending curvature can be changed at will.