Rewinding Machine Pressing Device for Core Insertion
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Solution Overview
Problem
Existing rewinding machines face issues with the exchange of tubular winding cores, leading to web material breakage due to dimensional variations and stiffness differences in cardboard cores, which affects the efficiency and reliability of the rewinding process.
Innovation Solution
A rewinding machine with an adjustable pressing device and insertion channel design that includes a continuous flexible member and a severing roller, allowing for independent adjustments to facilitate the angular acceleration and pinching of winding cores, ensuring consistent pressure and reduced web material breakage across varying core dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the insertion channel height is fixed to match standard core dimensions, then cores of nominal size can be inserted, but cores with dimensional variations cannot be properly inserted or compressed
Solution Approach 1:
The pressing device is made adjustable in position along the insertion channel, allowing the compression force application point to be dynamically repositioned to match variations in core dimensions. This enables the system to adapt to different core sizes while maintaining consistent pinching and compression effects.
Solution Approach 2:
The position parameter of the pressing device is made variable to accommodate changes in core dimensional parameters. By adjusting the pressing device position according to actual core dimensions, the system maintains optimal compression and pinching conditions despite variations in core size.
2Reliability
If the pressing device applies high compression force to ensure proper pinching, then winding cores are securely held, but web material breakage increases due to excessive force on variable stiffness cores
Solution Approach 1:
The pressing force parameter is made adjustable to match the stiffness variations of different winding cores. By adapting the compression force to the actual core properties, the system achieves reliable core holding without applying excessive force that could cause web material breakage.
Solution Approach 2:
The system incorporates adjustment mechanisms that allow the pressing device parameters to be modified based on observed core characteristics and web material response, optimizing the balance between secure holding and preventing breakage.
3Productivity
If the continuous flexible member runs at high speed to match web material feeding speed, then winding efficiency is maintained, but the pinching effect on incoming cores is insufficient for proper angular acceleration
Solution Approach 1:
The pressing device position is dynamically adjusted during the core insertion process to optimize the pinching effect. By positioning the pressing device at optimal locations along the insertion channel, sufficient angular acceleration is achieved without requiring reduction in continuous flexible member speed.
Solution Approach 2:
The pressing device applies preliminary pinching force to incoming cores before they fully engage with the continuous flexible member. This preliminary action provides the necessary angular acceleration to ensure cores are properly rotating before high-speed winding begins, maintaining overall productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the reliability and efficiency of the rewinding process by minimizing web material breakage and accommodating core variations, ensuring smooth operation with cores of different diameters and stiffness, and maintaining constant pressure for repeatable pinching effects.
Implementation Method 1
a pressing device arranged at the entrance of the insertion channel and configured to press the winding core entering the insertion channel toward the continuous flexible member
Implementation Method 2
the pressure exerted by the new winding core causes the traction of the web material between the point of contact with the new winding core and the roll in the completion phase
Implementation Method 3
This traction leads to the breakage or to the tearing of the web material between the pinch point with the new winding core and the winding point on the roll
Data Source
AI summary
A rewinding machine for the production of rolls of web material wound around winding cores includes: a winding cradle, including peripheral winding members of the rolls; a feeding path of the web material towards the winding cradle; an insertion channel for inserting the winding cores towards the winding cradle, having an entrance inside which the winding cores are introduced and an exit toward the winding cradle, the insertion channel being defined between a rolling surface and a continuous flexible member, provided with a forward movement; an inserter for inserting the winding cores into the inserting channel. At the entrance of the insertion channel a pressing device is arranged, said pressing device projects toward the inside of the insertion channel and toward the continuous flexible member. The pressing device is arranged and configured to press the winding cores entering the insertion channel towards the continuous flexible member.