Image Forming Apparatus Sheet Size Detection Control
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Solution Overview
Problem
Image forming apparatuses with intermediate transfer devices face issues with wasteful image formation when dealing with incorrectly sized sheets, leading to partial images and resource wastage, especially in remote transmission scenarios where image loss detection is delayed.
Innovation Solution
Incorporating a detection device to assess the size of the recording medium and a control device that inhibits the formation of subsequent page images if the medium is insufficient for transferring developer images, ensuring only complete images are printed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the image forming apparatus continues to form developer images on the photoconductor without checking sheet size, then the productivity is improved by continuous operation, but the loss of substance increases due to wasteful consumption of developing agent and other resources
Solution Approach 1:
The control device performs preliminary detection of sheet size before the developer image formation process begins. When a size mismatch is detected, the system preemptively stops the exposure device and development device before they consume resources, preventing wasteful formation of developer images that cannot be transferred to the sheet.
Solution Approach 2:
The control device continuously monitors sheet detection results and provides feedback to control the exposure and development processes. When the detection result indicates a size mismatch, the feedback loop immediately terminates the image formation process, ensuring resources are not wasted on incompatible sheets.
2Device complexity
If the apparatus detects sheet size after image formation, then the device complexity is reduced by simpler detection timing, but the loss of time increases due to delayed detection and continued resource consumption
Solution Approach 1:
The system performs sheet size detection before initiating the image formation process, rather than after. This preliminary detection approach, while requiring integration into the control flow, prevents the much greater waste of time and resources that would occur if detection happened after developer images were already formed.
3Productivity
If the exposure device forms electrostatic latent images continuously without interruption, then the productivity is improved by maintaining steady operation, but the reliability decreases when partial images occur due to sheet size mismatch
Solution Approach 1:
The control device uses feedback from the sheet detection device to dynamically control the exposure and development processes. When the detection feedback indicates a sheet size mismatch, the system automatically interrupts the continuous operation, preventing partial images and ensuring that only complete, transferable images are formed, thus maintaining reliability.
Solution Approach 2:
By detecting sheet size before image formation begins, the system can preemptively adjust or stop the exposure and development processes when a mismatch is detected, ensuring that only sheets capable of receiving complete images undergo the full image formation 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
Prevents wasteful image formation by ensuring only complete images are printed on correctly sized media, reducing resource usage and minimizing partial image output.
Implementation Method 1
an exposure device exposing component image data via laser light. The exposure device forms an electrostatic latent image on the photoconductor
Implementation Method 2
a development device forming a developer image on the photoconductor by developing the electrostatic latent image on the photoconductor
Data Source
AI summary
An image forming apparatus is provided that may prevent wasteful image forming in a state in which the loss or partial loss can occur of an image portion. If the length of the supplied sheet in the transport direction is shorter than a regular size by a predetermined value or more, then the laser exposing operation based on the received image data of the second or subsequent pages is stopped.