Stacker Actuation Synchronization via Master Signal
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Solution Overview
Problem
Conventional underlayment stickering stackers face inefficiencies in synchronizing the motion of their components, leading to suboptimal stack formation and maintenance of stack elevation during the lumber stacking process.
Innovation Solution
The introduction of a signal generator that produces a cyclical master signal to synchronize the motion patterns of the rake-off, carriage/fork, hoist, and stick devices, allowing for coordinated and efficient movement patterns through servo actuators and regenerative braking systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional separate control mechanisms are used for each device (rake-off, carriage/fork, hoist, stick), then device complexity is reduced and ease of operation is improved, but synchronization precision deteriorates and stacking consistency worsens
Solution Approach 1:
The patent merges the control mechanisms of multiple separate devices (rake-off, carriage/fork, hoist, stick) into a single integrated control system. This unified control mechanism coordinates all device movements through a common control architecture, enabling precise synchronization while maintaining manageable system complexity through modular design.
Solution Approach 2:
The control system incorporates feedback mechanisms that monitor the operational status and position of each device, adjusting their operation in real-time to maintain synchronization. This feedback loop ensures consistent stacking performance by dynamically coordinating device movements based on actual system state.
2Manufacturing precision
If a unified control mechanism is implemented to synchronize all devices, then stacking precision is improved, but device complexity increases and ease of operation decreases
Solution Approach 1:
The unified control system is segmented into modular control units for each device (rake-off control, carriage/fork control, hoist control, stick control). Each module operates independently with standardized interfaces, simplifying operation while maintaining overall synchronization through the integrated control architecture.
3Reliability
If separate control mechanisms are used for each device, then ease of operation is improved, but operational variability increases and reliability deteriorates
Solution Approach 1:
The unified control mechanism serves multiple functions simultaneously: it controls the rake-off device, carriage/fork device, hoist device, and stick device through a single control architecture. This multi-functional approach improves operational reliability by ensuring coordinated operation while avoiding the redundancy of separate control systems.
Data Source
AI summary
In one representative example an underlayment stickering stacker includes a carriage/fork device configured to move a course of material with underlaid sticks from a course forming station to a hoist device, thereby forming the stack of material. The stacker also includes a rake-off device configured to facilitate removal of the course of material from the carriage/fork device. The stacker also includes a regenerative actuator configured to provide regenerative braking power to one of the hoist device, the carriage/fork device and the rake-off device.