Image Forming Apparatus Reboot Without Printer Termination

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Solution Overview

Problem

The prolonged printer termination process in image forming apparatuses leads to extended downtime and reduced convenience due to the time required for rebooting, especially when system settings need to be updated, and the printer termination process involves operations like fan rotation, fixing drum separation, and charging shutter closure, which can take up to an hour.

Innovation Solution

The image forming apparatus is configured to skip the printer termination process upon receiving a reboot event, allowing the controller to execute a termination process independently, thereby reducing the overall reboot time by not performing the printer termination process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the printer termination process is executed during reboot, then device protection and durability are improved, but the reboot time is excessively prolonged

Engineering Contradiction:
Improvedevice protectionVSAvoidreboot time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The termination process is segmented into two distinct paths: a full termination process for shutdown events that includes printer protection operations, and a simplified termination process for reboot events that excludes printer operations. This segmentation allows the system to maintain device protection when needed while enabling fast reboot when required.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the termination process based on the type of event received. When a shutdown event is detected, the complete printer termination process is executed. When a reboot event is detected, the system selectively skips the printer termination process. This dynamic behavior resolves the contradiction by adapting the process depth to the specific operational context.

Inventive Principle:
Principle #15Dynamics

2Reliability

If the complete termination process is executed for all events, then device protection is ensured, but the convenience and responsiveness of the system is reduced

Engineering Contradiction:
Improvedevice protectionVSAvoidsystem convenience
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The termination process is divided into event-type-specific pathways. Shutdown events trigger the full protection-oriented termination sequence including printer operations, while reboot events trigger a streamlined sequence that maintains essential controller protection but omits time-consuming printer operations. This segmentation provides both protection and convenience based on operational context.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The system changes the parameter of termination process completeness based on the event type. For shutdown events, the termination completeness parameter is set to high (full process). For reboot events, the termination completeness parameter is set to low (simplified process). This parameter adjustment resolves the contradiction between protection and convenience.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS12386568B2Image forming apparatus and control method for image forming apparatus
Publication Date: 2025.08.12 CANON KK
  • US12386568B2 patent drawing
  • US12386568B2 patent drawing
  • US12386568B2 patent drawing

AI summary

An image forming apparatus capable of transitioning between at least a standby state and a termination state, the image forming apparatus including a controller and a printer device configured to form an image on a recording sheet. The controller is configured to receive an event for transitioning a state of the image forming apparatus, and the controller is configured to, by executing a termination process of the printer device and a termination process of the controller, transition from the standby state to the termination state. When a reboot event is received by the controller, the controller controls to execute a termination process of the controller without executing a termination process of the printer device.