Rapid Tearing Device for Paper Strip Separation in Rewinding Machines
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Solution Overview
Problem
Existing methods for separating continuous paper strips in rewinding machines are complex, often cause paper folds, and result in unnecessary waste, particularly when using buffers or combined actions with upper winding rolls.
Innovation Solution
A device with oscillating arms and a blade positioned near the core, which uses the core's pressure to align and tear the paper along perforation lines without external buffers or upper roll interaction, ensuring minimal waste and smooth separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure fluid blowing is used to tear the continuous strip, then the breakage along the perforated line is achieved, but the device complexity increases and paper folds are generated
Solution Approach 1:
The patent removes the complex high-pressure fluid blowing system and replaces it with a simple mechanical blade that directly contacts the paper strip at the perforation line. This extraction of the fluid system eliminates the need for complex pressure control mechanisms while achieving reliable tearing through direct mechanical action at the weakest point of the paper.
Solution Approach 2:
The blade acts as an intermediary element between the rolling surface and the paper strip. Instead of using complex fluid mechanisms, the blade provides a simple mechanical interface that concentrates force at the perforation line, enabling reliable breakage through a straightforward mediating component.
2Reliability
If buffers or combined action with upper winding roll are used, then the separation is achieved, but paper folds are caused and device complexity increases
Solution Approach 1:
The patent eliminates the buffer element and the complex combined action mechanism with the upper winding roll. Instead, it uses a simple blade that directly tears the paper at the perforation line, removing the sources of paper folds while maintaining effective separation.
Solution Approach 2:
The patent replaces the complex mechanical system involving buffers and coordinated roll actions with a simple direct mechanical blade action. This substitution achieves separation without the intermediary elements that cause paper folding, using straightforward blade contact at the perforation line.
3Reliability
If the tearing device uses buffers or upper roll interaction, then the separation is achieved, but the waste of paper increases
Solution Approach 1:
By removing the buffer and upper roll interaction mechanisms, the patent achieves separation with minimal paper consumption. The blade directly acts on the perforation line without requiring additional paper length for buffer engagement or coordinated roll motion, thereby reducing waste.
4Reliability
If complex tearing systems are used, then the breakage is achieved, but the ease of operation decreases
Solution Approach 1:
The patent removes complex control systems and multi-component mechanisms, leaving a simple blade that can be easily operated. The extraction of unnecessary components directly improves ease of operation while maintaining reliable breakage through the simplified direct-action blade at the perforation line.
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
Enables rapid, efficient, and fold-free tearing of paper strips with minimal waste, simplifying the rewinding process and maintaining paper quality by leveraging the core's pressure to align and break the paper at the perforation line.
Implementation Method 1
uses the core's pressure to align and tear the paper along perforation lines
Data Source
AI summary
A rapid tearing device of a strip in a rewinder for the winding of paper around a core (15) to produce a log (12), where said rewinder has a formation area of the log (12), for moving cores (15) forward into a channel (16) defined by a series of cradles (17) by an upper winding roller (18), the device having a blade (24), having the dimension of the width of the rollers (18, 19, 20), which can be moved by actuators (31, 35; 30, 22, 25) between a rest position and an engagement position on a core (15) when the core (15) is unloaded from said conveyor (13) by means of an introducer (34) and introduced into the channel (16) thus blocking, between core (15) and blade (24), the paper (11) which is being unwound.