Polygon Motor Speed Control for Image Forming Apparatus
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Solution Overview
Problem
Conventional image forming apparatuses experience delays in starting the polygon motor due to the time required to set and adjust the rotation speed based on sheet type detection, which suspends the start of succeeding image forming processes.
Innovation Solution
The image forming apparatus controls the polygon motor to rotate at a pre-exposure speed until the sheet type is detected, then switches to an exposure speed determined by the sheet type, allowing for prompt startup and optimized rotation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the polygon motor is set after detecting the sheet type, then the rotation speed can be optimized for the specific sheet type, but the time to start the polygon motor increases, causing delays in image forming processing
Solution Approach 1:
The polygon motor is started at a preliminary rotation speed before sheet type detection is completed. This preliminary action allows the motor to be operational immediately rather than waiting for detection to finish, thereby reducing startup time while still enabling subsequent optimization based on detected sheet type
Solution Approach 2:
The motor rotation speed is made dynamic by allowing it to change based on detection results. The system starts the motor at an initial speed and then adjusts the speed according to the detected sheet type, combining immediate startup with optimized performance
2Loss of time
If the polygon motor rotates at a speed suitable for all sheet types, then the motor can start immediately without waiting for sheet type detection, but the rotation speed cannot be optimized for specific sheet types
Solution Approach 1:
The motor rotation speed is made dynamic by allowing it to change based on detection results. The system starts the motor at an initial speed and then adjusts the speed according to the detected sheet type, combining immediate startup with optimized performance
Data Source
AI summary
An image forming apparatus includes: a light source that emits a laser beam; a polygon mirror that reflects the laser beam; a photoreceptor that is to be exposed to the laser beam reflected by the polygon mirror; a motor that rotates the polygon mirror; and a hardware processor capable of detecting sheet type, that is, type of a sheet conveyed in the image forming apparatus, wherein the hardware processor controls to rotate the motor at a first rotation speed until the sheet type is detected, and rotate the motor at a second rotation speed determined on the basis of the sheet type after detection of the sheet type.