Sheet Processing Cutting Mechanism Jamming Prevention
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Solution Overview
Problem
The existing sheet processing apparatus experiences sheet jamming and cutting failures due to long rear end cut regions, where the cut strips cannot be discharged properly, leading to stayed cut strips near the cutting mechanism and subsequent jamming or damage.
Innovation Solution
A method is implemented where the sheet processing apparatus finely cuts and divides long rear end cut regions into predetermined fine-cutting unit lengths, controlling the cutting mechanism and conveying rollers to ensure immediate discharge of cut strips by adjusting the conveying speed and maintaining the cutting mechanism open after cutting, allowing the cut strips to be guided downward without staying near the rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rear end cut region length is increased to accommodate more products, then the productivity is improved, but the cut strip cannot be discharged properly causing sheet jamming
Solution Approach 1:
The patent divides the long rear end cut region into multiple segments by making intermediate cuts. Specifically, when the rear end cut region length exceeds a predetermined threshold, the control section instructs the cutting mechanism to perform additional cuts at predetermined positions, creating multiple shorter cut strips that can be properly discharged between the cutting mechanism and conveying rollers, thereby preventing sheet jamming while maintaining high productivity
2Productivity
If the conveying speed is increased to improve processing efficiency, then the productivity is improved, but the cut strip is vigorously fed out causing it to pass over the lower fixed blade and stay on the downstream side
Solution Approach 1:
The patent applies preliminary action by controlling the conveying rollers to temporarily stop or reduce speed at the precise moment when a cut strip is being discharged. The control section monitors the cutting process and adjusts the conveying roller speed accordingly, ensuring that the cut strip is discharged at the optimal moment before normal conveying speed is resumed, thereby preventing the cut strip from being vigorously fed out and ensuring accurate cutting
Data Source
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AI summary
In the control of a cutting mechanism of a sheet processing apparatus, when rear end cut region (Sr) of a sheet is finely cut and divided into predetermined fine-cutting unit length (Lr0), the control section is configured to control the driving sources so that sheet conveying direction length (Lr1) of rearmost end divided region (Sr1) in rear end cut region (Sr) is the length substantially corresponding to distance (D1) between cutting position (P1) of the cutting mechanism and nipping position (P2) of a pair of first conveying rollers and that when rearmost end divided region (Sr1) passes through the nipping position of the pair of first conveying rollers, the pair of first conveying rollers are rotated 90° or more.