Rotary Cutter Phase and Speed Control for Web Material
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Solution Overview
Problem
Current rotary cutters require tedious and time-consuming processes for reconfiguring knife holders and adjusting knife blade positions to accommodate different product formats, leading to increased make-ready time and inefficiency in cutting web materials.
Innovation Solution
A rotary cutter system with two rotating cylinders where the phase difference and speed of rotation are controlled to adjust the cutting length and chip size, allowing for dynamic adjustment of cuts without repositioning knife blades, utilizing servo motors and a controller with software to manage the cutting and anvil cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If knife holders are mounted and repositioned on the knife cylinder to accommodate different product formats, then the rotary cutter can process various web material formats, but the make-ready time increases significantly
Solution Approach 1:
The knife cylinder is designed with a variable circumference capability, allowing the effective cutting circumference to be dynamically adjusted. This enables the same physical cylinder to accommodate different product lengths by changing its operational circumference without requiring physical reconfiguration of knife holders, thereby reducing make-ready time while maintaining adaptability to different formats
Solution Approach 2:
The system changes the operational parameter of the knife cylinder circumference to adapt to different cutting requirements. By varying the effective circumference of the knife cylinder, the system can produce different cut lengths from the same knife holder configuration, eliminating the need for time-consuming remounting operations
2Productivity
If multiple knife blades are mounted on the knife cylinder to produce multiple cuts per revolution, then various product formats can be achieved, but the complexity of positioning and configuring knife holders increases
Solution Approach 1:
The variable circumference knife cylinder serves multiple functions: it can produce different cut lengths, accommodate different numbers of cuts per revolution, and work with standard knife holder configurations. This multi-functionality reduces the need for specialized positioning systems while maintaining high productivity across various cutting scenarios
Data Source
AI summary
A rotary cutter system for cutting a web of material being feed into the rotary cutter at a press speed that includes a cutting cylinder, an anvil cylinder and a servo motor. The rotary cutter includes a controller that controls the speed of rotations of the cylinders. Control of the speed of cutting and anvil cylinders allows for the adjustment of the cut length of the material without having to adjust the position of knives in the cutting cylinder.