Dust-Proof Photoelectric Sensor With Clamping Angle Bracket
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Solution Overview
Problem
Conventional sensing devices in printers and scanners are prone to failure due to dust accumulation, which affects sensing sensitivity and paper feeding reliability, as they require large spaces, have complex assemblies, high costs, and are susceptible to signal bounce and dust shielding.
Innovation Solution
A dust-proof sensing device with a mechanical body featuring a feeding path, a first photoelectric sensor above and a second photoelectric sensor below the path, and brackets forming a clamping angle to prevent dust accumulation, ensuring continuous detection without signal shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional sensing device with a swinging arm and penetrating sensor is used, then the device structure is simple, but the device requires large space, has complex assembly, high cost, long signal response time, and is prone to signal bounce
Solution Approach 1:
The patent merges the emitter and collector photoelectric sensors into a single integrated sensing device with a shared housing and circuit board, eliminating the need for separate swinging arm mechanisms and reducing overall device volume while maintaining functionality
Solution Approach 2:
The sensing device is designed to perform multiple functions including dust detection, paper presence detection, and position signal transmission through a single integrated unit, reducing the need for multiple separate components and assembly steps
2Speed
If a traditional optical sensor with transmission channel is used, then the device responds sensitively and quickly, but paper scraps and carbon dust accumulate in the transmission channel, covering the collector sensor and shielding signals
Solution Approach 1:
The patent positions the photoelectric sensors at the top and bottom of the feeding path rather than facing each other across a transmission channel, changing the detection dimension to eliminate dust accumulation issues while maintaining rapid response capability
Solution Approach 2:
The patent removes the transmission channel structure entirely, extracting the dust accumulation problem from the system by positioning sensors to detect papers directly in the feeding path without requiring light to pass through a enclosed channel
3Measurement precision
If sensors are positioned to face each other across a transmission path, then detection is effective, but dust accumulates and shields the signal between sensors
Solution Approach 1:
The patent changes the sensor arrangement from a horizontal facing configuration across a transmission channel to a vertical arrangement with sensors at the top and bottom of the feeding path, eliminating the enclosed space where dust accumulates and shields signals
Solution Approach 2:
The patent introduces light guiding holders and light guiders as intermediary components to direct light from the emitter sensor to the collector sensor along a controlled path that avoids dust-prone areas, ensuring reliable signal transmission
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 solution effectively prevents dust accumulation, maintaining high sensing sensitivity and improving paper feeding reliability by isolating sensors and using a clamping angle design that directs dust away from the sensors, reducing failure probabilities and assembly complexities.
Implementation Method 1
a first photoelectric sensor disposed above a top side of the feeding path, a second photoelectric sensor disposed under a bottom side of the feeding path
Data Source
AI summary
A dust-proof sensing device includes a mechanical body, a feeding path, a first photoelectric sensor disposed above the feeding path, a second photoelectric sensor disposed under the feeding path, and an upper bracket. The mechanical body has a feeding path. The upper bracket is mounted above the feeding path. The upper bracket has an upper fastening portion fastened to the mechanical body, an upper wedging portion fastened at the upper fastening portion, an L-shaped upper light guiding holder fastened at the upper fastening portion, and a first light guider fastened at the upper light guiding holder. The upper fastening portion has a first inclined section. An inner edge of an upper surface of the first inclined section is intersected with a top edge of an inner surface of the upper wedging portion to form a clamping angle.