Image Forming Apparatus Controller Sheet Size Detection
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Solution Overview
Problem
Conventional image forming apparatuses face issues with marginless printing when the actual print sheet size differs from the size set in the external device, leading to excessive trimming of the original image data, resulting in unintended resizing and potential omission of user-intended portions during repeated resizing operations.
Innovation Solution
An image forming apparatus with a controller that detects the actual print sheet size and determines if resizing is necessary, applying trimming operations to ensure the image data matches the in-use sheet size, thereby preventing excessive trimming and ensuring accurate printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image data is resized again in the printing device to meet the actual sheet size, then the marginless printing can be performed on the actual sheet, but the original image data is trimmed twice causing excessive trimming and unintended resizing
Solution Approach 1:
The printing device performs preliminary detection of the actual sheet size before resizing operations. The controller detects the sheet size in advance and uses this information to determine whether resizing is necessary, preventing unnecessary repeated trimming operations that would cause excessive loss of image data.
Solution Approach 2:
The system implements feedback by detecting the actual sheet size and using this information to control the resizing operation. The controller receives sheet size information, compares it with the image data dimensions, and only applies resizing when necessary, thereby preventing redundant trimming operations.
2Ease of operation
If the resized image data is transmitted from the external device, then the marginless printing can be performed on the preset sheet size, but the actual sheet held in the tray may be different size requiring re-resizing
Solution Approach 1:
The printing device performs self-detection of the actual sheet size and automatically determines whether resizing is needed. The controller independently detects sheet dimensions and makes decisions about resizing operations without requiring manual intervention or complex external coordination, enabling the system to adapt to different sheet sizes autonomously.
3Shape
If the image is resized by trimming portions of the original image, then the image size can be adjusted to meet sheet requirements, but the area trimmed by two resizing operations may be excessively large
Solution Approach 1:
The system performs preliminary detection of sheet size and image data dimensions before any trimming operation. By knowing in advance whether resizing is necessary based on the detected actual sheet size, the system prevents unnecessary trimming operations that would cause excessive loss of image data.
Solution Approach 2:
The controller changes the parameter of sheet size detection to determine the appropriate resizing operation. By detecting the actual sheet size and comparing it with the image data dimensions, the system dynamically adjusts whether trimming operations should be applied, thereby controlling the amount of image data loss.
Data Source
AI summary
A controller of an image forming apparatus is configured to judge whether a first sheet size of the first image data is larger than a size of an in-use sheet. When the first sheet size is larger than the in-use sheet size, it is judged whether the resizing operation is to be applied to the first image data, resize the image size of the first image data to meet the in-use sheet size by applying the resizing operation to the first image data when the resizing operation is to be applied to the first image data, and control the image forming device to form an image on the sheet based on the first image data to which the resizing operation has been applied.