Projector Exhaust Port Shutter with Cam Roller Mechanism
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Solution Overview
Problem
Existing exhaust port shutter apparatuses for projectors require manual operation, which is cumbersome and inconvenient, as they rely on a slide knob and link mechanism for opening and closing the louver boards.
Innovation Solution
An exhaust port shutter apparatus with a cam roller mechanism that automatically opens and closes louver boards using a drive section, eliminating the need for manual operation by rotating the cam roller to align turning shaft pins with cam grooves, allowing for simultaneous opening and closing of the louver boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual slide knob and link mechanism is used to open and close louver boards, then the structure is simple, but the ease of operation deteriorates due to troublesome manual sliding at each on/off operation
Solution Approach 1:
The patent replaces the manual slide knob and link mechanism with an automated cam roller mechanism driven by a motor. The cam roller converts rotational motion into the reciprocating motion needed to open and close louver boards automatically, eliminating manual operation while managing system complexity through a compact mechanical design
Solution Approach 2:
The system enables self-service operation where the motor-driven cam roller automatically performs the opening and closing of louver boards based on operational state, without requiring manual intervention. The mechanism self-regulates the louver board positions according to projector on/off cycles
2Ease of operation
If a cam roller mechanism with motor drive is used to automatically open and close louver boards, then the ease of operation improves, but the device complexity increases due to additional drive components
Solution Approach 1:
The cam roller mechanism serves multiple functions: it acts as both the drive transmission element and the positioning mechanism for louver boards. The single cam roller component handles both opening and closing operations through its reciprocating motion, reducing the need for separate mechanisms and minimizing overall device complexity despite the added motor drive
Solution Approach 2:
The cam roller utilizes a curved cam groove profile that converts rotational motion into reciprocating linear motion. This curved geometry enables the single rotational movement of the cam roller to produce the back-and-forth motion required for opening and closing louver boards, achieving multi-functionality within a compact design
3Manufacturing precision
If the cam groove is formed as a closed loop on the peripheral surface, then the manufacturing precision improves, but the device complexity increases due to more complex cam groove formation
Solution Approach 1:
The cam groove is formed as a closed loop on the cylindrical surface of the cam roller, utilizing the natural geometry of the roller shape. This curved, closed-loop profile can be efficiently manufactured using standard cam roller fabrication methods while achieving the precise reciprocating motion required for reliable louver board operation
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 simplifies the operation of the exhaust port shutter apparatus, reducing the complexity of the circuit configuration and ensuring ease of use by automating the opening and closing of louver boards, enhancing airtightness when closed.
Implementation Method 1
a cam roller that is placed so as to be rotatable about an axis line and has a cam groove on a peripheral surface thereof, the cam groove into which each turning shaft pin fits, the cam roller that can reciprocate, by rotation thereof, each turning shaft pin by the cam groove along the first guide groove in the first direction
Data Source
AI summary
An exhaust port shutter apparatus which is attached to an exhaust port of a projector, includes: a guide section in which a first guide groove is provided; louver boards each having a turning shaft pin, the louver boards in which each turning shaft pin is formed so as to have a length which allows the turning shaft pin to pass through the first guide groove and project to the outside of the guide section; and a cam roller that has a cam groove on a peripheral surface thereof, the cam groove into which each turning shaft pin fits, the cam roller that can reciprocate, by rotation thereof, each turning shaft pin by the cam groove along the first guide groove in a first direction, wherein the louver boards are rotated at a necessary angle as a result of the cam roller being rotated and open and close the exhaust port.