Pressure Roller Spring-Damper Mounting for Winding Stability
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Solution Overview
Problem
Existing winding machines with pressure rollers experience vibrations and misalignments due to fluctuating damping characteristics of rubber elements, leading to uneven load on bearings and potential self-excited wobbling, which affects the stability of the coil mandrel.
Innovation Solution
A device with a pressure roller having spring-damper elements arranged radially and axially to provide consistent damping, reducing axial play and ensuring radial and axial stability, eliminating the need for additional fixed bearings by using elastic layers between inner and outer sleeves with specific rigidity and stop mechanisms to prevent overloading and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rubber elements are used as damping elements in the pressure roller bearings, then vibrations can be dampened, but the damping characteristic fluctuates considerably over lifespan due to aging and the stiffness is not constant
Solution Approach 1:
The patent changes the material parameter from rubber (aging-prone) to spring steel (stable), maintaining the damping function while eliminating the fluctuation problem. The spring-damper element uses spring steel with specific material properties (1.5 x 10^11 N/m^2 elasticity modulus) to provide consistent damping characteristics throughout its lifespan.
Solution Approach 2:
The patent creates a composite spring-damper element combining spring steel for structural stability and rubber for damping. The spring steel provides stable mechanical properties while the rubber layer provides vibration damping, creating a composite structure that solves both the vibration damping need and the stability problem.
2Object-affected harmful factors
If O-rings are used as damping elements, then vibrations can be dampened, but the pitch stiffness is relatively high and mounting is dependent on relative position causing fluctuating stiffness
Solution Approach 1:
The patent introduces a dynamic spring-damper mechanism that automatically adapts to position changes. The spring element allows the pressure roller to move dynamically while maintaining constant damping characteristics, eliminating the mounting position dependency of fixed O-ring systems.
3Stability of the object's composition
If the pressure roller is rigidly connected to the roller carrier with fixed bearings, then the pressure roller is stable, but the stiffness of rubber elements on both sides differ significantly causing self-excited wobble
Solution Approach 1:
The patent replaces rigid fixed bearings with a dynamic spring-damper mounting system. This allows the pressure roller to have stable yet flexible connections that can accommodate stiffness variations on both sides without generating self-excited wobble, as the spring element absorbs the differential stiffness effects.
Solution Approach 2:
The spring-damper element acts as an intermediary between the pressure roller and roller carrier, decoupling the rigid connection that causes wobble while maintaining stable support. The spring steel intermediary provides both mechanical support and vibration damping, eliminating the harmful self-excited oscillations.
4Adaptability or versatility
If misalignments of central axes occur between roller carrier and pressure roller bearing, then operational flexibility is maintained, but the load on raceways of multi-row bearings becomes very uneven
Solution Approach 1:
The spring-damper mounting provides dynamic adaptability to axis misalignments while distributing loads evenly through the elastic spring element. The spring can deflect to accommodate misalignments without creating concentrated loads on bearing raceways, maintaining both adaptability and bearing strength.
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 effectively dampens vibrations and maintains consistent bearing loading, reducing the likelihood of self-excited wobbling and enhancing the stability of the winding machine by ensuring even axial and radial attachment of the pressure roller.
Implementation Method 1
Each spring-damper element is designed to dampen vibrations of the pressure roller
Implementation Method 2
The spring-damper element is at least partially elastic
Implementation Method 3
The axial play of the pressure roller is reduced by each spring-damper element due to its sufficiently high axial stiffness
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The present invention relates to a device (1) for pressing a thread (2) onto a spool (3), having a pressure roller (4) with a thread guide portion (5) and at least one bearing portion (6, 22), and a roller support (7) with at least one receptacle (8, 38), wherein the pressure roller (4) has a bearing (9, 39) with an outer surface (10) in the region of the at least one bearing portion (6, 22), wherein at least one spring absorber element (11, 23) is arranged on the outer surface (10) of the bearing (9), wherein the pressure roller (4) can be rotated with the bearing (9) and the at least one spring absorber element (11, 23) in which at least one receptacle (8, 38) of the roller support (7) is mounted and wherein the at least one spring absorber element (11, 23) is designed to fasten the pressure roller (4) radially and axially relative to the roller support (7). The present invention also relates to a corresponding winding machine (36). The invention is characterised by an especially effective shock absorption of the pressure roller (4).