Belt Sander Positioning Unit for Angular Adjustment
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Solution Overview
Problem
Conventional belt sanders require users to manually adjust the angular position of the belt arm, which can be difficult due to the need to follow the rotation of the belt arm while applying force.
Innovation Solution
A belt sander design featuring a positioning unit with a movable positioning member and an engaging member that allows for easy adjustment of the belt unit's angular position without requiring the user to follow the rotation of the belt arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the engaging member is co-rotatable with the belt arm, then the belt arm can be positioned at different angular positions, but the user must follow the rotation of the belt arm while applying force, making operation difficult
Solution Approach 1:
The patent introduces a second axis (Y-axis) for the positioning member's linear movement, which is transverse to the first axis (X-axis) of belt arm rotation. This dimensional separation allows the positioning member to move linearly along the Y-axis while the belt arm rotates along the X-axis, eliminating the need for the user to follow the rotation while applying force. The positioning member's linear motion along a different dimension solves the operational difficulty.
2Adaptability or versatility
If the engaging member is co-rotatable with the belt arm, then angular position adjustment is possible, but the user cannot maintain control of the handle while adjusting
Solution Approach 1:
The positioning member is configured to move linearly along the Y-axis (transverse to the rotation axis), which allows adjustment to be performed in a different dimension from the belt arm's rotation. This enables the user to operate the positioning member with one hand while maintaining grip on the handle with the other hand, as the adjustment motion does not interfere with handle control.
3Device complexity
If the engaging member is co-rotatable with the belt arm, then the positioning mechanism is simple, but the user must apply force while following rotation, reducing operational efficiency
Solution Approach 1:
The patent creates a dynamic system where the positioning member moves linearly along the Y-axis while the belt arm rotates along the X-axis. The resilient member provides dynamic biasing force to maintain engagement. This dynamic configuration allows easy adjustment without requiring the user to follow rotation, significantly improving operational efficiency while maintaining reasonable mechanism simplicity.
Data Source
AI summary
A belt sander includes: a power unit having a rotating shaft; a rotatable belt casing defining a track groove that is open toward the power unit and that surrounds the rotating shaft, and having a plurality of engaging portions that are arranged around the track groove; an abrasive belt drivable by the rotating shaft; and a positioning unit including a movable positioning member that is adapted for manual operation, and an engaging member that is co-movably connected to the positioning member. The positioning unit is movable between an engaging position, where the engaging member is engaged with a selected one of the engaging portions, and a releasing position, where the engaging member is disengaged from the engaging portions.