Annular Band Blade Cutting Machine for Paper Logs
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Solution Overview
Problem
Existing cutting-off machines for paper logs suffer from reduced cutting quality due to a blade that becomes less sharp as it cuts multiple logs, and the front portions of logs tend to move during cutting, leading to inefficiencies.
Innovation Solution
A cutting-off machine with a vertically oriented band blade that is constantly sharpened and uses lateral and upper pressers to securely hold the logs in place, ensuring each bevel works optimally on a single log at a time, with a sharpening device maintaining blade sharpness and guiding mechanisms to maintain blade position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a horizontal blade is used to cut multiple logs in sequence, then the cutting machine can process multiple logs, but the blade becomes less sharp as it cuts through multiple logs, reducing cutting quality
Solution Approach 1:
The blade is segmented into multiple independent cutting elements arranged in a circular pattern, allowing each element to cut only one log before moving to the next position. This segmentation ensures that each cutting element maintains its sharpness by not reusing the same cutting surface on multiple logs, thus resolving the contradiction between processing multiple logs and maintaining cutting quality.
Solution Approach 2:
The blade is made dynamically movable, rotating or oscillating between cutting positions. This dynamic movement allows the blade to present different sharp edges to each log in sequence, ensuring that every cutting action is performed with a fresh, sharp edge while still processing multiple logs efficiently.
2Productivity
If the blade is lowered and lifted to cut logs, then cutting can be performed, but the front portions of logs move during cutting due to thrust, worsening cutting quality
Solution Approach 1:
Pressing elements are positioned to apply preliminary counter-thrust to the front portions of the logs before and during the cutting operation. This preliminary anti-action counteracts the thrust force generated by the blade, preventing the logs from moving and ensuring precise cutting while maintaining productivity.
3Ease of operation
If a horizontal blade cuts logs sequentially, then the same bevel point contacts all logs, but the bevel wears down and becomes less effective for downstream logs
Solution Approach 1:
The blade is divided into multiple discrete cutting elements distributed around its circumference. Each element is designed to cut one or a few logs before moving to a fresh position, ensuring continuous cutting operation while maintaining reliable sharpness for each individual cutting action.
Solution Approach 2:
The blade design ensures continuous useful cutting action by having multiple elements available at different positions. While one element is cutting a log, other elements are positioned to be ready for the next cutting operation, maintaining continuous productivity without compromising the sharpness-reliability link.
Data Source
AI summary
Machine for cutting paper logs, including a support for supporting one or more logs (3) disposed side by side, device for advancing the logs (3) on the support, device for the transverse cutting of the logs (3) and device for blocking logs (3) during their cutting. The cutting device includes an annular band blade (4) having a bevel (400, 401) on both its edges, provided in correspondence to a cutting station (T) in which the logs (3) are cut and connected to corresponding guiding and actuating structure, the blade (4) featuring a portion (40) defining a corresponding cutting plane which is oriented orthogonally with respect to the longitudinal axes of logs (3), the blade being provided with a sharpening device (100) continuously acting on both its bevels (400,401). The machine includes structure for the relative motion of logs (3) with respect to the blade (4) along the cutting plane. The blade (4) acts on one log (3) at a time.