Log Peeling Axis Detection Using Swingable Profile Sensors
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Solution Overview
Problem
Existing methods for determining the optimum peeling axis and maximum radius point on a peeler log in veneer production are complex and time-consuming, leading to increased non-cutting downtime and reduced productivity due to inefficient peeling operations.
Innovation Solution
A method and apparatus that compute the optimum peeling axis and maximum radius point by measuring radial distances and angular positions of swingable members in contact with the log's peripheral surface, allowing for precise positioning of the veneer knife to minimize downtime and enhance productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the calculation procedure for determining the location of the maximum radius point is performed using the prior apparatus, then the location can be determined, but the procedure is complicated and time-consuming
Solution Approach 1:
The patent performs preliminary measurement of the log's three-dimensional shape using multiple log profile detectors before the peeling operation. The obtained log shape data is stored and used to calculate the optimum peeling axis and maximum radius point in advance, eliminating the need for complex real-time calculations during the peeling process. This preliminary action resolves the contradiction by preparing all necessary geometric information beforehand.
Solution Approach 2:
The patent replaces complex mechanical calculation procedures with automated computational methods. A computer automatically processes the log shape data obtained from multiple detectors to determine the optimum peeling axis and maximum radius point, substituting manual or mechanical calculation with efficient digital computation. This substitution dramatically reduces calculation time while maintaining high precision.
2Ease of manufacture
If the knife carriage is located too far from the lathe spindles, then the setup is simpler, but the non-cutting downtime increases and productivity decreases
Solution Approach 1:
The patent performs preliminary calculation of the maximum radius point location and optimum peeling axis before the peeling operation begins. The knife carriage position is pre-determined based on the log's actual geometry, allowing the knife to be positioned optimally without complex real-time adjustments. This preliminary positioning resolves the contradiction by preparing the optimal setup in advance.
Solution Approach 2:
The patent uses feedback from multiple log profile detectors to continuously monitor and determine the log's actual shape and dimensions. This feedback information is used to calculate and adjust the knife carriage position to the optimal location, ensuring the knife starts cutting immediately when the log rotates. The feedback loop resolves the contradiction by enabling precise, data-driven positioning.
Data Source
AI summary
A method for locating an optimum peeling axis of a log and a maximum radius point on peripheral surface of the log with respect to the located optimum peeling axis and an apparatus for practicing the method are disclosed. A plurality of swingable members are provided, each member having a contact surface which is swingable in contact with the peripheral surface of the log thereby to follows the peripheral profile of the log while it is being rotated about its preliminary axis. Angular positions of the contact surfaces are measured with respect to a reference position at a number of angularly spaced positions of the log. On the basis of the measured angular positions of the contact surfaces, radial distances of the log from a plurality of predetermined locations on the optimum peeling axis to selected contact surfaces are computed for comparison such radial distances. The distance having the greatest value is regarded as the maximum radius point of the log.