Printing Apparatus Motor Temperature Sheet Collision Control
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Solution Overview
Problem
In printing apparatuses, conveyance deviations occur due to temperature rises in conveyance motors, leading to collisions and inaccuracies when high-speed driving of the feeding roller is initiated without considering the reduced speed of the conveyance motor, causing the succeeding sheet to collide with the preceding sheet.
Innovation Solution
A conveyance controller is implemented to execute either an overlapping conveyance operation or a spaced conveyance operation based on the temperature state of the conveyance motor, adjusting the speed of the conveyance and feeding rollers to prevent collisions and deviations by switching to low-speed drive when a temperature rise is detected, ensuring accurate sheet alignment and skew correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feeding roller uniformly switches to high-speed driving to overlap the succeeding sheet on the preceding sheet, then the throughput of continuous printing is improved, but conveyance deviation occurs due to temperature rise of the conveyance motor causing collision between sheets
Solution Approach 1:
The patent applies dynamics by making the feeding roller's driving speed variable rather than fixed. The control unit dynamically adjusts the feeding roller's speed based on real-time detection of the conveyance motor's temperature state. When the conveyance motor temperature is normal, the feeding roller operates at high speed for improved throughput. When the conveyance motor temperature rises, the feeding roller automatically reduces its speed to prevent collision, thus resolving the contradiction between productivity and reliability through dynamic speed adjustment.
Solution Approach 2:
The patent implements feedback control by using a temperature detection unit to continuously monitor the conveyance motor's temperature state and feeding this information back to the control unit. The control unit then adjusts the feeding roller's driving speed based on this feedback. This closed-loop feedback mechanism enables the system to automatically adapt to temperature changes and maintain reliable sheet conveyance while maximizing throughput, directly addressing the technical contradiction.
2Reliability
If the feeding roller is repeatedly driven and stopped to avoid collision with the preceding sheet, then collision is prevented, but conveyance deviation is caused by backlash of the driving unit
Solution Approach 1:
The patent applies dynamics by continuously adjusting the feeding roller's driving speed based on the conveyance motor's temperature state rather than using repeated start-stop operations. By dynamically matching the feeding roller's speed to the actual conveyance speed, the system prevents collision while maintaining smooth continuous motion, thereby avoiding the backlash issues that arise from frequent stopping and restarting.
Solution Approach 2:
The patent applies preliminary action by detecting the conveyance motor's temperature state in advance and proactively adjusting the feeding roller's speed before collision can occur. This predictive adjustment prevents the need for reactive stop-start operations, maintaining both collision prevention and conveyance precision through continuous smooth operation.
Data Source
AI summary
A printing apparatus comprises a first roller for conveying sheets, a first motor for driving the first roller, a second roller for conveying sheets, a second motor for driving the second roller, and a conveyance controller that controls conveyance to be able to execute a first conveyance operation for conveying sheets such that the trailing edge of a preceding sheet and the leading edge of a succeeding sheet overlap, and a second conveyance operation for conveying sheets by arranging a distance between the trailing edge of the preceding sheet and the leading edge of the succeeding sheet. The conveyance controller, based on information indicating whether the second motor is in a temperature rising state, controls whether to execute the first conveyance operation or to execute the second conveyance operation.