Image Forming Apparatus Valid Region Signal Control
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Solution Overview
Problem
Conventional image forming apparatuses designed for cut paper sheets face inefficiencies when printing on long paper sheets, resulting in uneven intervals between printed portions and decreased productivity due to the need for significant hardware and software modifications to manage long paper sheet lengths.
Innovation Solution
An image forming apparatus generates a continuous valid region signal by combining basic and extended valid region signals across multiple channels, allowing for efficient image formation on long paper sheets without requiring special counters or additional memory, by simulating the control procedures used for regular-sized paper sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional image forming apparatus control methods are used for long paper sheets, then the apparatus can print on long paper sheets, but the intervals between printed portions become uneven and productivity decreases
Solution Approach 1:
The patent divides the long paper sheet printing task into multiple segments corresponding to regular-sized paper sheets. The control unit manages printing by processing the long paper sheet as a sequence of segmented regions, each handled with standard control procedures, thereby maintaining uniform intervals while accommodating the extended length.
Solution Approach 2:
The patent changes the control parameter from treating the entire long paper sheet as a single continuous entity to managing it as multiple discrete segments. By adjusting how the valid region signal is generated and managed across these segments, the system achieves uniform printing intervals without requiring special hardware modifications.
2Adaptability or versatility
If special counters and additional memory are added to cope with long paper sheets, then the apparatus can manage long paper sheet lengths, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing control unit multi-functional by enabling it to handle both regular-sized paper sheets and long paper sheets using the same hardware resources. The control unit dynamically adapts its operation mode based on the paper sheet type, eliminating the need for dedicated special-purpose counters or additional memory components.
Solution Approach 2:
The patent uses software-based virtualization to create a logical representation of multiple regular-sized paper sheet segments within the long paper sheet. This virtual copying approach allows the system to simulate the handling of multiple standard sheets without requiring physical duplication of hardware resources.
Data Source
AI summary
An image forming apparatus includes a control unit that generates a valid region signal corresponding to the length of a paper sheet of a regular size in the conveyance direction thereof, and performs control to form an image on the paper sheet based on the valid region signal, wherein, when an image is formed on a long paper sheet having a longer length than the paper sheet of the regular size, the control unit generates the valid region signal in each channel, performs control for generating the next valid region signal in a period during which the valid region signal is not generated in any of the channels, generates a continuous valid region signal corresponding to the long paper sheet by combining the valid region signals in the channels, and performs control to form an image by reading out image data based on the continuous valid region signal.