US 11,200,663 B1Granted

Method and system for layered wood product production using local robotic panel assembly cells and vision system analysis

AssigneeBoise Cascade Corporation

InventorsDavid Bolton, Jude Richard Peek, Curtis Fennell, Jason Matthew Coutee

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Abstract

A method and system for production of layered wood products employs local and independently operating robotic panel assembly cells including a vison system for inspecting and grading veneer sheets, one or more veneer handling robots, one or more core handling robots, and one or more glue application robots to produce stacks of layered wood product panels locally near the pressing stations. Consequently, the stacks of layered wood product panels are independently built at, or near, the location of the pressing stations using inspected and graded veneer sheets. This eliminates the need for traditional panel conveyors, traditional layered wood product panel assembly layup lines, and stack press delivery lines. This, in turn, eliminates thousands of moving parts and dozens of people from the layered wood product production process.

Claims16

Dependent claims

A local robotic panel assembly and pressing station, the local robotic panel assembly and pressing station comprising:

a robot panel assembly cell, the robot panel assembly cell producing a stack of green layered wood product panels, the robot panel assembly cell including a vision system for veneer inspection and grading, the vision system for veneer inspection and grading including:
a first camera to capture a black and white image of an entire surface of a wood product, wherein the first camera has a first field of view, and further wherein the first camera captures a black and white image of the wood product at a first location along a conveyor of a production line, the first location being within the first field of view;
a second camera to capture a color image of the entire surface of the wood product, wherein the second camera has a second field of view, the second field of view substantially overlapping with the first field of view and further wherein the second camera captures a color image of the wood product at the first location, the first location being within the second field of view;
and
a vision system controller to:
translate the black and white image from the first camera and the color image from the second camera such that the same portion of the wood product captured by each camera is overlaid in a composite view and the images have the same horizontal spacing;
perform computer processing of the black and white image to determine one or more of the dimensions of the wood product, the existence of voids within the wood product, and the presence of debris on the wood product;
perform computer processing of the color image to determine whether colored defects are present in the wood product;
and
assign a grade to the wood product based at least in part on the computer processing of the black and white image and the computer processing of the color image;
a pre-press, the pre-press pressing the stack of green layered wood product panels to produce pre-pressed layered wood product panels;
and
a hot press, the hot press heating and pressing the pre-pressed layered wood product panels to produce cured layered wood product panels.

10 more elements

A robot panel assembly cell, the robot panel assembly cell producing a stack of green layered wood product panels, the robot panel assembly cell including:

a vision system for veneer inspection and grading, the vision system for veneer inspection and grading including:
a first camera to capture a black and white image of an entire surface of a wood product, wherein the first camera has a first field of view, and further wherein the first camera captures a black and white image of the wood product at a first location along a conveyor of a production line, the first location being within the first field of view;
a second camera to capture a color image of the entire surface of the wood product, wherein the second camera has a second field of view, the second field of view substantially overlapping with the first field of view and further wherein the second camera captures a color image of the wood product at the first location, the first location being within the second field of view;
and
a vision system controller to:
translate the black and white image from the first camera and the color image from the second camera such that the same portion of the wood product captured by each camera is overlaid in a composite view and the images have the same horizontal spacing;
perform computer processing of the black and white image to determine one or more of the dimensions of the wood product, the existence of voids within the wood product, and the presence of debris on the wood product;
perform computer processing of the color image to determine whether colored defects are present in the wood product;
and
assign a grade to the wood product based at least in part on the computer processing of the black and white image and the computer processing of the color image;
one or more veneer inspection and grading robots, the one or more veneer inspection and grading robots retrieving veneer sheets from a stack of veneer sheets and presenting the veneer sheets to the vision system in accordance with received control signals, the vision system inspecting the veneer sheets and assigning a grade to the veneer sheets, the one or more veneer inspection and grading robots then placing the veneer sheets into one of two or more graded veneer stacks according to the grade assigned to the veneer sheets;
one or more veneer handling robots, the one or more veneer handling robots retrieving veneer sheets from the two or more graded veneer stacks and placing the veneer sheets on a green layered wood product panel stack in accordance with received control signals;
one or more glue application robots, the one or more glue application robots applying a layer of glue between sheets of veneer in the green layered wood product panel stack in accordance with received control signals;
and
a robot control system for controlling the one or more veneer handling robots and the one or more glue application robots and directing the one or more veneer handling robots and the one or more glue application robots in the construction of the green layered wood product panel stack via control signals sent to the one or more veneer handling robots and the one or more glue application robots.

12 more elements

A local robotic panel assembly and pressing station, the local robotic panel assembly and pressing station comprising:

a robot panel assembly cell, the robot panel assembly cell producing a stack of green layered wood product panels;
a vision system for veneer inspection and grading the robot panel assembly cell including one or more veneer inspection and grading robots, the one or more veneer inspection and grading robots retrieving veneer sheets from a stack of veneer sheets and presenting the veneer sheets to the vision system in accordance with received control signals, the vision system inspecting the veneer sheets and assigning a grade to the veneer sheets, the one or more veneer inspection and grading robots then placing the veneer sheets into one of two or more graded veneer stacks according to the grade assigned to the veneer sheets, the vision system for veneer inspection and grading including:
a first camera to capture a black and white image of an entire surface of a wood product, wherein the first camera has a first field of view, and further wherein the first camera captures a black and white image of the wood product at a first location along a conveyor of a production line, the first location being within the first field of view;
a second camera to capture a color image of the entire surface of the wood product, wherein the second camera has a second field of view, the second field of view substantially overlapping with the first field of view and further wherein the second camera captures a color image of the wood product at the first location, the first location being within the second field of view;
and
a vision system controller to:
translate the black and white image from the first camera and the color image from the second camera such that the same portion of the wood product captured by each camera is overlaid in a composite view and the images have the same horizontal spacing;
perform computer processing of the black and white image to determine one or more of the dimensions of the wood product, the existence of voids within the wood product, and the presence of debris on the wood product;
perform computer processing of the color image to determine whether colored defects are present in the wood product;
and
assign a grade to the wood product based at least in part on the computer processing of the black and white image and the computer processing of the color image;
one or more veneer handling robots, the one or more veneer handling robots retrieving veneer sheets from the two or more graded veneer stacks and placing the veneer sheets on a green layered wood product panel stack in accordance with received control signals;
one or more glue application robots, the one or more glue application robots applying a layer of glue between sheets of veneer in the green layered wood product panel stack in accordance with received control signals;
a robot control system for controlling the one or more veneer handling robots and the one or more glue application robots and directing the one or more veneer handling robots and the one or more glue application robots in the construction of the green layered wood product panel stack via control signals sent to the one or more veneer handling robots and the one or more glue application robots;
a pre-press, the pre-press pressing the stack of green layered wood product panels to produce pre-pressed layered wood product panels;
a hot press, the hot press heating and pressing the pre-pressed layered wood product panels to produce cured layered wood product panels;
and
a quality analysis and feedback cell, the quality analysis and feedback cell for analyzing the quality of cured layered wood product panels and adjusting the control signals sent to the one or more veneer inspection and grading robots, the one or more veneer handling robots, and the one or more glue application robots in response to the quality analysis in order to improve the quality of subsequent cured plywood panels.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/074,956Filed 20 Oct 2020 · continuation in part
Priority: 6 Dec 2017
Granted: 14 Dec 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G06T 7/001
Industrial image inspection: using an image reference approach
B27D 1/04
Joining wood veneer with any material; Forming articles thereby ; Preparatory processing of surfaces to be joined, e.g. scoring: to produce…
B27D 3/02
Veneer presses; Press plates; Plywood presses: with a plurality of press plates, i.e. multi- platen hot presses
G06T 7/0004
Inspection of images, e.g. flaw detection: industrial image inspection