Timber Displacement Device with Discontinuous Stop Guidance
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Solution Overview
Problem
Existing timber displacement devices in sawmills face limitations in production capacity due to continuous guide attachment of stops, leading to increased 'stick-slip' effects and reduced accuracy, especially when guides are oriented diagonally, resulting in inefficiencies and over-travel issues during the adjustment process.
Innovation Solution
The introduction of a docking device with discontinuously guided stops and displacement means allows for flexible combinations of stop and displacement interactions, reducing friction and improving precision through electrically powered linear units with notched belts, enabling more efficient and accurate timber displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stops are continuously guided on a guide piece throughout the entire revolution, then the stops maintain continuous contact with the guide, but this leads to increased stick-slip effects and reduced positioning accuracy
Solution Approach 1:
The guide piece is designed with periodic engagement zones where the follower contacts the guide surface only during specific portions of the revolution, rather than continuously. This periodic contact reduces cumulative stick-slip effects while maintaining reliable positioning during the active engagement phases.
Solution Approach 2:
The continuous guide piece is segmented into multiple zones with different functional characteristics. Some zones provide guidance and contact, while others allow the follower to coast or disengage, breaking the continuous contact into manageable segments that reduce overall friction accumulation.
2Adaptability or versatility
If guides are oriented diagonally to the transportation direction, then lateral transfer of stops is enabled, but this increases the stick-slip effect and dependence on guide angle
Solution Approach 1:
The guide piece incorporates variable geometry or adjustable orientation that allows the guide angle to be dynamically optimized for each specific lateral transfer requirement, rather than using a fixed diagonal orientation. This reduces the stick-slip effect by aligning the guide more favorably with the motion requirements.
Solution Approach 2:
An intermediary mechanism such as a cam profile or curved guide surface is introduced between the stop and the final positioning point, allowing lateral transfer to be achieved through a more favorable motion path that reduces direct diagonal sliding and its associated stick-slip effects.
3Reliability
If the follower is continuously guided on the guide piece, then positioning is maintained throughout the revolution, but this limits the capacity of the adjuster
Solution Approach 1:
Multiple followers are engaged with the guide piece at different phases of the revolution, allowing one follower to be actively positioned while another is in transit or preparing. This periodic engagement of multiple units increases the overall capacity of the adjuster while maintaining reliable positioning during each active phase.
Solution Approach 2:
The guide piece is designed to support multiple discrete followers at different locations along its length, allowing independent positioning of multiple stops simultaneously. This segmentation of the positioning function across multiple followers increases system capacity while each follower maintains reliable contact during its active positioning phase.
4Manufacturing precision
If electrically powered linear units with notched belts are used for discontinuous guidance, then friction is reduced and precision is improved, but device complexity increases
Solution Approach 1:
Traditional continuous mechanical guidance systems are replaced with electrically powered linear units that use controlled motor movement with notched belts to achieve precise positioning. This substitution eliminates continuous friction-based guidance while providing accurate, programmable displacement control.
Solution Approach 2:
The guidance system transitions from passive mechanical contact to active electromagnetic control, where motor parameters (speed, position, acceleration) are precisely controlled to achieve the desired follower motion. This parameter-based control provides high precision while allowing discontinuous engagement to reduce friction.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a device for displacing timber pieces (2) longitudinally by adjustment of the timber pieces comprising a cross conveyor (1) equipped with a driver (3), stops (6) provided to bear against and displace the timber piece longitudinally, a continuous track (4) with which the stops (6) are driven synchronously with the cross conveyor (1), wherein the stops (6) are displaceably mounted on units that are transferable along it, displacement means (5) arranged to displace the stops (6) in a positioning area (X, Z) in a cross direction against the transfer along the track for displacement of the timber pieces (2) in the longitudinal direction. For increased efficiency, the device comprises at least two displacement means (5) in the cross direction of the continuous conveyor (4) variable independently of each other, a docking device with a guide (13), provided for each displacement means (5), with a first end (13a) and which is variable across a width (X) of the positioning area (X, Y) in the cross direction of the continuous conveyor (4), a first follower (12) provided for each stop (6), which can be caused to be in guided interaction with a guide (13) at a transfer point an entry end (14) to the positioning area (X, Y), wherein said entry end forms a certain zero reference (0-ref) for adjustment with respect to the positioning area width (X) for stops (6) that can be caused to interact with a guide (13) the state of which is set at said transfer point.