Log Trimming Apparatus for Orthogonal Cut Quality
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Solution Overview
Problem
Current paper roll trimming processes result in inaccuracies due to irregular core projections, oblique end bases, and non-uniform consistency, leading to imperfect cuts and excessive waste, as existing cutting-off machines struggle to produce consistent small rolls with orthogonal cuts.
Innovation Solution
An apparatus with a revolving unit that holds logs, uses grippers to clamp and transfer them, and circular blades for precise trimming, eliminating the need for trim removal sections in cutting-off machines, ensuring consistent log lengths and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If cutting-off machines use minimal trim length to reduce waste, then material waste is minimized, but cut quality deteriorates due to non-orthogonal cuts and imperfect small rolls
Solution Approach 1:
The invention applies preliminary trimming action to logs before they enter the cutting-off machine. By pre-trimming logs to uniform length with proper end faces, the subsequent cutting operation can produce high-quality orthogonal cuts without needing excessive trim length, thus resolving the contradiction between minimal waste and cut quality
Solution Approach 2:
The invention separates the trimming function from the cutting-off function into distinct operational stages. The trimming section prepares logs with uniform dimensions, while the cutting-off section focuses solely on producing precise cuts. This segmentation allows each section to optimize its specific function without compromise
2Productivity
If cutting-off machines process logs with irregular core projections and oblique end bases, then production continuity is maintained, but manufacturing precision deteriorates due to inaccurate cut positions
Solution Approach 1:
The trimming section performs preliminary action on logs by cutting irregular ends and core projections before logs enter the cutting-off machine. This pre-processing ensures all logs have uniform length and flat end faces, eliminating the precision problems caused by irregularities while maintaining continuous production flow
Solution Approach 2:
The trimming section acts as an intermediary between log production and cutting-off operations. It receives irregular logs from the rewinding machine and outputs uniform logs to the cutting-off machine, mediating the transition and eliminating the negative effects of log irregularities on cut precision
3Manufacturing precision
If trim removal means are added to cutting-off machines to separate trims from small rolls, then product quality is improved, but device complexity increases
Solution Approach 1:
The invention extracts the trimming function from the cutting-off machine and places it in a separate upstream trimming section. This removes the need for complex trim removal mechanisms within the cutting-off machine, as trims are already separated before logs enter the cutting section, simplifying the overall device structure while maintaining product quality
Data Source
AI summary
Apparatus for trimming paper rolls or logs (2) including: a section for the entry of the logs (2) to be trimmed; a section for the exit of the trimmed logs (2′); a station with cutting device (6) for trimming the logs (2); a device (3) for moving the logs (2, 2′) between the entry section, the cutting station and the exit section; a device (4), associated with the log-moving device (3), for retaining the logs when subjected to movement.