Pulling Roller Spring Element for Film Winding Prevention
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Solution Overview
Problem
Existing packing machines face unplanned machine stops due to web material winding around pulling rollers when not in use, as existing countermeasures are ineffective in preventing this occurrence.
Innovation Solution
An apparatus with a spring element disposed around or relative to the pulling roller, which can be adjusted to apply force and prevent web material from winding around the roller by positioning it away from contact, utilizing friction materials and adjustable tension to ensure efficient operation without increasing the risk of machine stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If no web material advancement is occurring, then the machine can adapt to capacity requirements, but the web material winds around the pulling roller causing unplanned machine stops
Solution Approach 1:
The spring element applies a preliminary counteracting force to the web material when it comes into contact with the pulling roller during idle periods. This preliminary action prevents the web material from winding around the roller before the winding can occur, thereby maintaining machine reliability while allowing adaptability to capacity requirements.
Solution Approach 2:
The spring element acts as an intermediary between the web material and the pulling roller. It provides a mechanical counterforce that intermediates the potential harmful contact between the idle web material and the roller surface, preventing winding while allowing the machine to adapt to varying capacity requirements.
2Device complexity
If a rigid device is used to counteract winding, then the structure is simple, but it cannot prevent film winding and may cause the film to be stuck
Solution Approach 1:
The spring element introduces dynamics to the counteracting device, allowing it to flex and adapt to the web material's movements. Unlike a rigid structure, the spring can dynamically adjust its force application, preventing film winding while avoiding the risk of sticking the film between rigid surfaces.
Solution Approach 2:
The spring element changes the mechanical parameter of the counteracting force from fixed (rigid) to variable (elastic). This parameter change allows the device to maintain simplicity while significantly improving its ability to prevent film winding without causing film sticking.
3Reliability
If the spring element applies strong force, then web material winding is prevented, but the friction material may move in axial direction
Solution Approach 1:
The groove structure provides localized containment for the friction material at the specific location where the spring element applies force. This local quality enhancement (the groove) allows the spring to apply sufficient force for winding prevention while the groove geometry prevents axial displacement of the friction material.
Solution Approach 2:
The combination of spring element, friction material, and groove structure creates a composite system where each component addresses a specific aspect of the problem. The spring provides the counteracting force, the friction material provides the gripping surface, and the groove provides the positional stability, together resolving the contradiction between force application and material stability.
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 apparatus effectively prevents web material from winding around the pulling roller, allowing machines to adapt to capacity requirements without unplanned stops, ensuring continuous operation and reducing static electricity through material choices like stainless steel.
Implementation Method 1
The embodiments are based on the use of at least one spring element in a device for counteracting winding up of film or web material
Implementation Method 2
the pulling roller has a friction material in the form of O-rings or silicon tube and where the friction material is fixed in grooves or recesses in the pulling roller in order to prevent the friction material from moving in axial direction
Data Source
AI summary
Disclosed herein is an apparatus for packing articles as well as a device for counteracting winding up of film or web material for an apparatus for packing articles, the packing being formed by at least one web material conveyed over at least one pulling roller, wherein the device for counteracting winding up is disposed in relation to the pulling roller and extending at least partially around the pulling roller, whereby is achieved an easy, secure and functional device that efficiently counteracts and obviates the possibility of web material being wound around a pulling roller.