Image Recording Apparatus Roller Speed Control
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Solution Overview
Problem
Image recording apparatuses face challenges in maintaining accurate conveying rates due to differences in friction force between image-formed and unimage-formed recording mediums, leading to potential deterioration in image forming quality.
Innovation Solution
The apparatus includes an image position detector to adjust the rotation rates of discharge and conveyor rollers based on the position of the image on the recording medium, ensuring precise conveying accuracy by controlling the rotation of the driving rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge roller pair conveys the recording medium at a constant rotation rate, then the conveying process is simple and stable, but the conveying accuracy deteriorates due to varying friction force between image-formed and unimage-formed parts
Solution Approach 1:
The patent applies dynamics by changing the rotation rate of the discharge roller pair from constant to variable based on the position of the image-formed part. The control unit adjusts the rotation rate dynamically according to the detected image position, allowing the system to adapt to varying friction conditions and maintain accurate conveying throughout the process.
Solution Approach 2:
The patent implements feedback by using an image position detector to continuously monitor the position of the image-formed part on the recording medium. This detected information is fed back to the control unit, which then adjusts the rotation rate of the discharge roller pair accordingly, creating a closed-loop control system that maintains conveying accuracy.
2Manufacturing precision
If the rotation rate of the discharge roller pair is adjusted to match image-formed parts, then conveying accuracy improves, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies parameter changes by modifying the rotation rate parameter of the discharge roller pair based on the position of the image-formed part. The control unit adjusts this rotational parameter dynamically, allowing the system to optimize conveying accuracy for different regions of the recording medium without requiring fundamental changes to the mechanical structure.
3Speed
If the discharge roller pair nips the image-formed part of the recording medium, then the recording medium is conveyed toward the outlet, but the friction force varies causing conveying rate mismatch
Solution Approach 1:
The patent applies dynamics by making the rotation rate of the discharge roller pair variable rather than constant. The system dynamically adjusts the rotation rate based on the detected position of the image-formed part, compensating for the varying friction force and maintaining stable conveying speed throughout the process.
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
This solution enhances conveying accuracy and maintains image forming quality by adapting the rotation rates of the rollers to match the specific conditions of the recording medium, regardless of whether it has an image or not.
Implementation Method 1
an image position detector, which is configured to detect a position of the formed image
Implementation Method 2
friction force caused in between the discharge roller pair with the image-formed part of the recording medium tends to be different from friction force caused in between a part of the recording medium with no image
Data Source
AI summary
An image recording apparatus is provided. The image recording apparatus includes a first conveyer to convey a recording medium in a first direction, a recording unit to record the image on the recording medium, a second conveyer including a first roller pair with a first driving roller and a first driven roller, an image position detector to detect a position of the formed image along a second direction within the recording medium, a rotation rate setting unit to set a rotation rate of the first driving roller based on the detected position of the formed image when a part of the formed image on the recording medium is nipped by the first roller pair, and a controller to control the first driving roller to rotate in the rotation rate set by the rotation rate setting unit and convey the recording medium by the first roller pair.