Random Orbital Stroke Adjustment With Counterweight Balancing
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Solution Overview
Problem
Current random orbital machines lack an adjustable stroke mechanism that allows users to customize the offset between the driveshaft axis and the backing plate axis without disassembling the machine, limiting their versatility and efficiency in polishing and cutting actions.
Innovation Solution
An adjustable stroke mechanism is introduced, featuring a gear case housing with a shroud, a first gear with a counterweight attachment point, a second gear with a backing plate attachment point, and an idler gear, along with an adjustment bar and counterweight that slide along a groove to adjust the stroke, maintaining balance and reducing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the stroke is increased to enhance cutting action and surface area treatment, then productivity and cutting ability improve, but the machine becomes more difficult to control and generates more vibrations
Solution Approach 1:
The patent implements an adjustable stroke mechanism that allows the user to dynamically change the stroke length during operation. The mechanism includes an adjustment bar with a groove, a counterweight that slides along the groove, and a locking mechanism that enables the stroke to be modified between minimum and maximum settings without disassembling the machine. This dynamic adjustability resolves the contradiction by allowing the user to select optimal stroke settings for different tasks.
2Adaptability or versatility
If the machine is designed with fixed stroke for simplicity, then device complexity is reduced, but adaptability and versatility are limited
Solution Approach 1:
The adjustable stroke mechanism is divided into distinct functional components: an adjustment bar with a groove, a counterweight with balancing features, a locking mechanism, and connection elements. This segmentation allows each component to perform its specific function while maintaining overall simplicity. The mechanism can be integrated into existing random orbital machine designs without requiring complete redesign.
3Object-affected harmful factors
If the counterweight is positioned to balance the backing plate at maximum stroke, then vibrations are reduced at maximum stroke, but the mechanism becomes more complex to adjust
Solution Approach 1:
The patent employs a counterweight that slides along a groove in the adjustment bar to balance the backing plate at different stroke positions. The counterweight mechanism includes a key that engages with the groove and automatically positions the counterweight to offset vibrations caused by the offset between the driveshaft axis and backing plate axis. This counterbalancing system reduces vibrations across the full range of stroke adjustments.
Data Source
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AI summary
An adjustable stroke mechanism for a random orbital machine including a housing having a wall enclosing a cavity, an adjuster ring surrounding the housing and having a fist set of gear teeth along a first portion of an inner surface, and a second set of gear teeth along a second portion of the inner surface, a counterweight having gear teeth on an exterior surface disposed within the housing, and a bearing carriage having gear teeth disposed within the housing. At least one counterweight gear that meshes with the gear teeth of the counterweight and the first set of gear teeth of the adjuster ring, and at least one bearing carriage gear that meshes with the gear teeth of the bearing carriage and the second set of gear teeth of the adjuster ring, so that movement of the adjuster ring causes movement of both the counterweight and the bearing carriage.