Rewinding Machine Severing Member Dynamics
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Solution Overview
Problem
Modern rewinding machines for tissue paper and similar products face issues with web material fold-back defects due to the length of the fold-back caused by the severing point's distance from the new winding core, and the frequent mechanical adjustments required for the severing member, which lead to vibrations and reduced reliability.
Innovation Solution
A rewinding machine with a motor-controlled severing member that accelerates after severing to avoid collisions with the new core, reducing the fold-back length and allowing adjustments through electronic control without manual intervention, thereby maintaining production speed and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the severing member is positioned far from the new winding core to ensure proper web material severing, then the severing operation is reliable, but the fold-back length of the web material increases causing product defects
Solution Approach 1:
The patent applies dynamics by making the severing member movable along the channel with variable speed control. The severing member can accelerate after severing to avoid collision with the new core, allowing it to operate closer to the core while maintaining reliable severing. This dynamic positioning resolves the contradiction by enabling the severing member to adapt its position and speed rather than being fixed far from the core.
Solution Approach 2:
The patent changes the speed parameter of the severing member dynamically. By controlling the speed of the severing member along the channel, the system can maintain reliable severing operation while reducing the distance from the new core, thereby minimizing fold-back length. The speed parameter adjustment allows the severing member to complete its function quickly and retract before collision occurs.
2Reliability
If the pressure pads of the severing member are adjusted manually to maintain sufficient pressing force, then the severing effectiveness is maintained, but the machine requires frequent manual intervention reducing productivity
Solution Approach 1:
The patent applies self-service by implementing an electronic control system that automatically adjusts the position and speed of the severing member without manual intervention. The system monitors and maintains optimal pressing force through electronic actuators, eliminating the need for manual pad adjustments while maintaining severing effectiveness throughout production.
Solution Approach 2:
The patent replaces the manual mechanical adjustment system with an electronic control system. Instead of manually adjusting pressure pads, the system uses electronic actuators and control circuits to maintain optimal pressing force automatically. This substitution eliminates manual intervention and maintains productivity while ensuring consistent severing effectiveness.
3Reliability
If the severing member exerts high pressure on the winding roller to ensure web material severing, then the severing operation is effective, but the machine experiences increased vibrations causing structural problems and wear
Solution Approach 1:
The patent applies dynamics by controlling the speed and position of the severing member dynamically. The severing member operates at optimized speeds and positions that reduce impact forces on the winding roller while maintaining effective severing. This dynamic control minimizes vibrations and harmful forces during the severing operation.
Solution Approach 2:
The patent uses periodic action by controlling the severing member to operate in controlled cycles with acceleration and deceleration phases. The severing member accelerates to the required position, performs the severing operation, then decelerates and retracts before collision with the new core. This periodic motion pattern reduces impulsive vibrations compared to continuous high-pressure operation.
Data Source
Figure 1A~1B
Figure 1C
Figure 2A~2B
AI summary
The rewinding machine comprises: a first winding roller (1), around which the web material (N) is guided, and defining at least in part a winding cradle; a sup¬ port surface (11) of the winding cores (A), arranged to receive a winding core and to convey it toward the winding cradle, the support surface defining with the first wind¬ ing roller (1) a feed channel (9) of winding cores (A); a severing member (17) of the web material, which can be inserted in the channel to sever the web material, the sev¬ ering member interacting with the web material to cause severing thereof; a motor (19) for controlling the severing member, the motor controlling the severing member modifying the speed of the severing member when it is positioned inside the channel (9)·