Belt Sander Frame Arm Positioning and Sensor Interlock
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Solution Overview
Problem
Conventional hand-held belt sanders pose safety risks when the sanding belt is not properly shut off during adjustments, as the actuator's position relative to the sensor is limited, and users may inadvertently harm themselves by interacting with the rotating sanding belt during operation.
Innovation Solution
A belt sander design featuring a positioning unit with a movable positioning member and an engaging member that allows the frame arm to rotate between working and storage states, coupled with a sensor unit that generates signals to control power delivery based on the positioning member's position, ensuring power is cut off regardless of the frame arm's angular position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the actuator is disposed in the arm and the sensor senses the actuator to cut off electric power, then safety is guaranteed when the sander is stored, but the sanding belt may cause harm to the user's hand when the arm is adjusted to a desired operating position with the sanding belt still operational
Solution Approach 1:
A positioning member is introduced as an intermediary component between the arm and the sensor. The positioning member can be manually moved to a blocking position to physically block the sensor's detection of the actuator, thereby preventing the sensor from incorrectly triggering power cutoff during arm adjustment operations
Solution Approach 2:
The system uses the user's own manual operation of the positioning member to control the sensor's detection state. When the user needs to adjust the arm, they manually move the positioning member to block the sensor, and when adjustment is complete, they move it back to allow normal sensor function
2Ease of operation
If the actuator is disposed in the arm, then the sander can be compact and portable, but the actuator can only be sensed by the sensor when the arm is rotated to a specific position relative to the casing
Solution Approach 1:
The positioning member serves as a mediator that can be manually positioned to either block or allow sensor detection. This enables the sensor to detect the actuator reliably across different arm positions when needed, while maintaining the compact portable design with the actuator in the arm
Solution Approach 2:
The positioning member is made movable between different positions (blocking position and non-blocking position), allowing the system to dynamically adapt the sensor's detection capability based on the operational state. This enables flexible operation where the sensor can detect the actuator when the arm is at various positions if the positioning member is appropriately positioned
Data Source
AI summary
A belt sander includes a main casing, a frame arm rotatably connected to the main casing, an abrasive belt mounted to the frame arm and adapted to be driven by electric power, a positioning member, a first sensor and a second sensor. The positioning member is movably mounted to the main casing and is movable relative to the main casing between a releasing position, where the first and second sensors are in a first sensor state, and where the second sensor generates a first signal for ceasing the electric power, and a first engaging position, where the first and second sensors are in the second sensor state, and where the second sensor generates a second signal for conducting the electric power.