Knife Carriage Pressure Bar Segmentation for Veneer Peeling
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Solution Overview
Problem
Existing knife carriages for peeling veneers from logs suffer from issues such as excessive pressure leading to damage, unevenness, and linear stains due to partial bending of pressure bars, which can cause scratches and water seepage, affecting the quality of the peeled veneer.
Innovation Solution
A knife carriage design featuring a long pressure bar with independently movable supports that allow for partial deformation, preventing excessive pressure and water seepage, while maintaining appropriate pressing force and preventing damage from corner ridges, using a configuration with multiple support points and urging members to ensure stable and flexible pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure bar is divided into plural pieces to allow partial bending, then the occurrence of cracks and knife clogging is prevented, but the corner of the pressure bar may contact and damage the peeled veneer
Solution Approach 1:
The pressure bar is divided into multiple segments (first pressure bar, second pressure bar, third pressure bar) that can bend independently. Each segment is supported by separate support members, allowing localized deformation at knot parts while preventing the corner from contacting and damaging the veneer through coordinated movement of multiple segments
Solution Approach 2:
Different segments of the pressure bar have different functional characteristics - the main body segments provide pressing force while the corner segment is designed to avoid contact with the veneer. The support members are positioned to allow bending at specific locations while maintaining control over corner movement
2Reliability
If the pressure bar presses the peeled portion, then veneer quality is improved by preventing cracks, but water may seep out and create linear stains
Solution Approach 1:
The pressure bar segments are supported by movable support members that can dynamically adjust their position based on the resistance encountered. When encountering water-filled knots, the supports allow the pressure bar to flex and return, preventing water from being forced out through gaps and creating stains, while still maintaining sufficient pressure to prevent cracks
3Reliability
If the pressure bar is made long to press peeled portions effectively, then veneer quality improves, but the pressure bar may excessively press and damage the veneer
Solution Approach 1:
The long pressure bar is segmented into multiple sections, each supported by independent support members. This allows different parts of the long bar to exert appropriate pressure independently - sections over knot parts can flex while sections over normal wood maintain steady pressure, preventing both cracks and excessive pressing damage
Solution Approach 2:
The support members are configured to allow dynamic movement of the pressure bar segments. When the pressure bar encounters resistance from knots or chips, the supports enable localized bending and movement, automatically reducing pressure in those areas while maintaining appropriate pressure elsewhere, thus preventing excessive pressing damage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances veneer quality by preventing scratches and linear stains, ensuring proper pressing force without excessive pressure, and maintaining the integrity of the peeled veneer, even when peeling from logs with knots or water content.
Implementation Method 1
the first and second supports are supported by the fixture to be movable independently of each other in the direction away from the wood according to the magnitude of the reaction force of a pressing force of the pressure bar against the peeled portion
Data Source
AI summary
A nosebar is supported by supports arranged along the longitudinal direction, and the supports are assembled to fixtures to swing independently of each other in a direction away from a log according to the reaction force of the pressing force acting on the supports. Thus, when a knife peels a knot part of the log or a fragment of the log enters a cutting edge, the portion of the nosebar pressing the knot part or corresponding to the location where the fragment enters the cutting edge is greatly deformed, while the deformation of the nosebar in the other portions is kept small. A corner of the nosebar is prevented from contacting the peeled portion of the raw wood and generating a gap when the nosebar is bent and deformed.