Slitter-Scorer Motion Control for Shorter Defective Changeovers
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Solution Overview
Problem
Existing slitter-scorer apparatuses in corrugated paperboard production face challenges in minimizing the length of defective zones during order changes, leading to reduced yield and excessive wear on the movement mechanism, despite efforts to minimize setup time.
Innovation Solution
A slitter-scorer apparatus with a control device that sets target acceleration/deceleration based on the cutter cutoff length and paperboard feed speed, optimizing the movement of slitters and scorers to ensure yield while reducing mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the corrugated paperboard-processing tool is moved as quickly as possible during order change to minimize setup time, then the defective length is minimized, but the movement mechanism experiences excessive wear and mechanical stress
Solution Approach 1:
The patent applies dynamics by making the acceleration and deceleration values variable rather than fixed at maximum. The control device dynamically adjusts these parameters based on real-time feedback about the actual position of the processing tool, allowing optimal balance between speed and mechanical stress reduction. This resolves the contradiction by enabling fast positioning without consistently operating at maximum acceleration that causes wear.
Solution Approach 2:
The patent implements feedback through position detection means that continuously monitor the actual position of the corrugated paperboard-processing tool during movement. The control device uses this feedback information to adjust acceleration and deceleration values, ensuring the tool reaches the target position within the defective length constraint while avoiding excessive mechanical stress. This feedback loop resolves the contradiction by adapting movement parameters to actual system state.
2Loss of time
If maximum acceleration and deceleration are used to move the processing tool during order change, then the defective length is minimized, but the yield improvement is limited by the fixed cutter cutoff length
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting acceleration and deceleration values based on the relationship between defective length and cutter cutoff length. When the calculated defective length exceeds the cutter cutoff length, the control device reduces acceleration/deceleration parameters to ensure the defective length stays within cuttable limits. This resolves the contradiction by adapting movement parameters to maintain both speed and yield.
3Reliability
If the acceleration and deceleration are reduced to minimize mechanical wear, then the movement mechanism durability is improved, but the setup time increases and defective length increases
Solution Approach 1:
The patent applies dynamics by making acceleration and deceleration values variable rather than fixed at conservative levels. The control device dynamically adjusts these parameters based on real-time feedback about the actual position of the processing tool, allowing optimal balance between mechanical stress reduction and maintaining fast positioning. This resolves the contradiction by enabling high durability without sacrificing yield through unnecessarily slow movement.
Data Source
AI summary
A slitter-scorer apparatus comprises: a corrugated paperboard-processing tool comprising a plurality of slitters and a plurality of scorers; a width directional movement mechanism and an up-down directional movement mechanism configured to move the corrugated paperboard-processing tool in a width direction and an up-down direction, respectively; and a control device configured to control the two movement mechanisms. The control device is configured to: set a target setup time for moving the corrugated paperboard-processing tool for an order change, based on a cutter cutoff length of a portion of a corrugated paperboard to be cut off by a cutter during the order change, and a paperboard feed speed; set a target acceleration/deceleration so as to allow the movement of the corrugated paperboard-processing tool to be completed in the target setup time; and control the movement mechanisms to move the corrugated paperboard-processing tool with the target acceleration/deceleration.