Link Mechanism Guide Roller Retention for High-Speed Stretching
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Solution Overview
Problem
The high-speed movement of link devices in stretching machines is obstructed due to vibrations that cause detachment of guide rollers and their retaining mechanisms.
Innovation Solution
The link mechanism incorporates guide rollers with openings on both ends, press-fitted first shafts, and second shafts with support bearings, enhancing vibration resistance and securing the guide rollers in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If guide rollers are attached using C-shaped retaining rings, then the structure is simple and easy to assemble, but the retaining rings detach due to vibrations during high-speed movement
Solution Approach 1:
The shaft is divided into multiple functional segments: a press-fit portion for secure attachment to the guide roller, a smooth portion for bearing contact, and a projection portion for positioning. This segmentation allows each part to perform its specific function optimally while maintaining overall reliability during high-speed operation
Solution Approach 2:
The shaft is nested within the guide roller bore, with the press-fit portion inserted into the guide roller and the smooth portion extending into the bearing. This nested configuration ensures secure retention while allowing rotational movement, eliminating the need for separate retaining rings
2Productivity
If the link device moves at high speed, then productivity improves, but vibrations cause detachment of guide rollers and retaining mechanisms
Solution Approach 1:
The press-fit portion is designed with interference fit geometry that preemptively counteracts vibrational forces before they can cause detachment. The projection portion similarly pre-positions the shaft to prevent any potential separation during high-speed operation
Solution Approach 2:
The smooth portion of the shaft features a cylindrical curvature that interfaces with the bearing, allowing for uniform rotational contact that reduces vibration generation and maintains reliable connection during high-speed movement
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
This configuration allows for high-speed movement of the link mechanism, reducing the time required for film formation and improving productivity by preventing detachment of guide rollers and retaining mechanisms.
Implementation Method 1
a first shaft (54, 55) having openings on both end sides in a direction along the axial direction, one side being press-fitted into the rail holder (24a, 24b)
Implementation Method 2
a second shaft (58, 59) having a shaft portion (58a, 59a) inserted into the first shaft (54, 55) and a support portion (58b, 59b) supporting a bearing (56a, 56b, 57a, 57b)
Data Source
AI summary
A link mechanism 11 constituting a link device used in a stretching machine configured to stretch a film includes a pair of rail holders 24. Each of the rail holders 24 include guide rollers 51a, 51b, 52a, and 52b having openings on both end sides in an axial direction and moving while rotating, hollow shafts 54 and 55 having openings on both end sides in a direction along the axial direction, one sides being fixed to the rail holders 24 and the other sides being inserted into the guide rollers 51a, 51b, 52a, and 52b, bearings 56a, 56b, 57a, and 57b interposed between the guide rollers 51a, 51b, 52a, and 52b and the hollow shafts 54 and 55 and configured to rotatably support the guide rollers 51a, 51b, 52a, and 52b, and flanged shafts 58 and 59 having shaft portions 58a and 59a inserted into the hollow shafts 54 and 55 and flanges 58b and 59b supporting the bearings 56a and 57a.