Method and apparatus for assembling veneer sheet into a plywood

An apparatus for assembling veneer sheets into a plywood comprising:

• means for supplying the veneer sheets having a uniform size;
• a feed conveyor for forwarding the veneer sheets along a path;
• a spreading assembly disposed in said feed conveyor for spreading glue on at least one of the upper and lower surfaces of the veneer sheets;
• at least one abutment for stopping the veneer sheet on said feed conveyor whereby the forward edge of said veneer sheet is precisely oriented to extend in the transverse direction perpendicular to the feed direction;
• detecting means for detecting the position of the edge of the stopped veneer sheet extending in the feed direction;
• an assembling conveyor extending parallel to said feed conveyor and adapted to be moved intermittently at predetermined time intervals;
• means for measuring length of movement of said assembling conveyor;
• a transfer unit for transporting the stopped veneer sheet to a position on said assembling conveyor, said transfer unit including means for holding the veneer sheet during entire travel of the transportation;
• and
• control means connected to said detecting means, said measuring means and said transfer unit for:
• detecting deviation of the stopped veneer sheet from a reference line extending in the feed direction;
• comparing the measured length of movement of said assembling conveyor with a present value for determining an error, and moving said transfer unit in such a manner as to fabricate a stepped lamination of the veneer sheets on said assembling conveyor while correcting the length of the transverse movement of said transfer unit on the basis of the detected deviation and of the longitudinal movement of said transfer unit on the basis of the determined error.

An apparatus for assembling veneer sheets into a plywood comprising

• a feeding conveyor for conveying wood sheets having a uniform size from a supply of the sheets along apath, the feeding conveyor including a glue spreading assembly for spreading glue on at least one of tne upper and lower surfaces of each wood sheet as it travels along the path, at least one abutment for stopping the wood sheet on the feeding conveyor at a first position such that the forward edges of the wood sheet is precisely oriented to extend in the transve direction perpendicular to the path, and detecting means for detecting the position of an edge of the wood sheet extending in the path direction when the wood sheet is stopped by the at least one abutment;
• an assembling conveyor extending parallel to said feeding conveyor and adapted to be moved intermittently at predetermined intervals including means for measuring the length of movement of the assembling conveyor;
• a transfer unit for transporting the wheel sheets from the first position on the feeding conveyor to a position on the assembling conveyor, the transfer unit including means for holding the wood sheet during the transfer;
• control means for controlling the transfer unit, the control means including means connected to said detecting means for detecting any deviation of a sheet stopped by said at least one abutment from a reference line extending in the path direction, measuring means for comparing the measured length of movement of the assembling conveyor with a preset value for determining an error;
• and
• means for moving said transfer unit in such a manner as to fabricate a stepped lamination of the wood sheets on the assembling conveyor while correcting the length of transverse and longitudinal movement of the transfer unit on the basis of said detected deviation and determined error.