Paper Roll Winding Channel With Three-Roller Start Stability
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Solution Overview
Problem
Existing rewinding machines for paper rolls suffer from instability and web breakage during the initial winding step, particularly with large diameters, due to inadequate control of the secondary roller speed and pressure roller engagement, leading to potential web breakage and the need for customized parameter adjustments.
Innovation Solution
A rewinding machine with simultaneous control by three rollers (two winding and one pressure roller) ensures stable winding by maintaining contact throughout the process, using a 'V' shaped movable arm to oscillate the pressure roller, reducing vibrations and eliminating web breakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only two rollers (primary and secondary) control the winding at the start, then the structure is simpler, but the winding stability deteriorates causing web breakage
Solution Approach 1:
The control function is segmented across three distinct rollers: primary roller, secondary roller, and pressure roller. Each roller performs a specific control function during the initial winding phase, distributing the stability control task across multiple components rather than relying on just two rollers, thereby improving reliability without excessive complexity
Solution Approach 2:
The pressure roller is positioned and activated in advance during the initial winding phase to provide preemptive control over the web tension and positioning. This preliminary action prevents web instability before it can cause breakage, addressing the reliability issue proactively
2Reliability
If the secondary roller speed is modulated to prevent web breakage, then the winding reliability improves, but the control complexity increases
Solution Approach 1:
Instead of modulating the speed of the secondary roller across its entire operation, the control is localized to the initial winding phase only. The pressure roller is engaged specifically when needed (at the start) and then disengaged, applying control precisely where and when it is required without affecting the rest of the winding process
Solution Approach 2:
The pressure roller operates in a periodic manner: engaged during the initial winding phase to prevent web breakage, then disengaged for the remainder of the winding process. This periodic engagement provides reliability improvement only when needed, avoiding continuous complex control
3Manufacturing precision
If customized roller profiles are implemented to optimize winding, then the manufacturing precision improves, but the ease of manufacture deteriorates
Solution Approach 1:
Instead of customizing the physical profile of the secondary roller, the invention changes the operational parameters of the pressure roller (engagement timing, position, and duration). This allows optimization of winding precision through parameter adjustment rather than through complex custom roller manufacturing
Solution Approach 2:
The invention uses a standard, off-the-shelf pressure roller design that can be readily manufactured and replaced. Rather than requiring custom-profiled rollers, it copies the functional effect of optimized winding through the adjustable operation of a conventional roller component
Data Source
AI summary
A machine for producing paper rolls includes a first and a second winding rollers rotatably mounted, respectively, about first and second axes; first and second pressure rollers rotate, respectively, about a third axis on a first movable arm, and about a fourth axis on a second movable arm. The rollers define a winding channel for a web of paper around a core, for forming a roll. The core moves by one or more of the rollers, between a position for winding and position for expelling the wound roll. The winding rollers are positioned, relative to the pressure rollers on opposite sides of the channel, relative to movement of the core The movable arms pivot, respectively, on first and second secondary axes such that the rotation of the first and/or the second movable arm moves the first and/or the second pressure roller from or towards the first and/or second winding roller.