Roll Sheet Position Control After Cover-Open Print Interruptions

Solution Overview

Problem

Existing printing apparatuses face usability issues due to unnecessary determination of paper jams when a cover is opened during printing, leading to interrupted print jobs and potential damage to the apparatus.

Innovation Solution

The apparatus includes detection sensors to monitor the cover state and sheet position, with a control unit that interrupts printing and returns the sheet to a predetermined position upon cover closure, preventing paper jams and improving usability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the printing operation is interrupted when the cover is opened during printing, then the apparatus can prevent potential paper jams and safety issues, but the print job is unnecessarily canceled and usability deteriorates

Engineering Contradiction:

Improveprevention of paper jamVSAvoidusability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The conveying mechanism performs preliminary action by returning the sheet to the predetermined position (sheet feed position) before resuming the printing operation. This preliminary repositioning ensures that when printing resumes, the sheet is correctly positioned and prevents potential paper jams, while allowing the print job to continue rather than being canceled.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control unit uses feedback from the detection sensor to monitor the cover state. When the cover is closed again, the sensor detects this state and triggers the conveying mechanism to return the sheet. This feedback-based control allows the system to adapt its behavior based on the cover state, preventing paper jams while maintaining print job continuity.

Inventive Principle:

Principle #23Feedback

2Reliability

If the print job is canceled when the cover is opened for maintenance, then safety is improved, but the occurrence of paper jam is unnecessarily determined due to sheet remaining in apparatus

Engineering Contradiction:

ImprovesafetyVSAvoidsheet position accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The conveying mechanism performs preliminary action by returning the sheet to the predetermined position (sheet feed position) before resuming the printing operation. This preliminary repositioning ensures that when printing resumes, the sheet is correctly positioned and prevents potential paper jams, while allowing the print job to continue rather than being canceled.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control unit uses feedback from the detection sensor to monitor the cover state. When the cover is closed again, the sensor detects this state and triggers the conveying mechanism to return the sheet. This feedback-based control allows the system to adapt its behavior based on the cover state, preventing paper jams while maintaining print job continuity.

Inventive Principle:

Principle #23Feedback

3Productivity

If the sheet is not returned to predetermined position when cover is closed, then the printing operation can resume quickly, but paper jam may occur due to incorrect sheet position

Engineering Contradiction:

Improveprinting speedVSAvoidpaper jam prevention

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The conveying mechanism performs preliminary action by returning the sheet to the predetermined position (sheet feed position) before resuming the printing operation. This preliminary repositioning ensures that when printing resumes, the sheet is correctly positioned and prevents potential paper jams, while allowing the print job to continue rather than being canceled.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control unit uses feedback from the detection sensor to monitor the cover state. When the cover is closed again, the sensor detects this state and triggers the conveying mechanism to return the sheet. This feedback-based control allows the system to adapt its behavior based on the cover state, preventing paper jams while maintaining print job continuity.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12504935B2Printing apparatus having sheet position control, control method, and computer-readable storage medium

Publication Date: 2025.12.23 CANON KK

AI summary

A printing apparatus includes a conveying roller to convey a sheet from a roll sheet and a printing unit. In addition, a cutter is provided downstream of the printing unit and cuts the sheet, an operation input unit accepts a setting indicating whether to cut the sheet in case of canceling a print job, and a control unit interrupts the printing operation if an open state of a cover is detected during the printing operation and controls the conveying roller to return the sheet to a predetermined position if a closed state of the cover is detected afterward. If a setting indicates that the sheet is not cut, the conveying roller returns the sheet to the predetermined position without cutting the sheet with the cutter in a case of canceling a print job.