Sheet Supply Device Slack Control for Noise Reduction
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Solution Overview
Problem
Conventional sheet supply devices generate noise due to slack expansion and flapping of print sheets, particularly after the trailing edge passes through intermediate feed rollers, which is not adequately addressed by existing noise reduction methods.
Innovation Solution
A sheet supply device with a controller that manages the rotation of registration and feed rollers to form a predetermined slack, then reduces the slack amount before the trailing edge passes through, ensuring the slack remains until the trailing edge is cleared, synchronizing the feed speeds to prevent noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the assistant operation is carried out by driving both the registration rollers and the intermediate feed rollers simultaneously, then the sheet expansion noise is reduced by keeping the slack amount, but a flapping noise is generated after the trailing edge passes through the intermediate feed rollers
Solution Approach 1:
The controller stops the intermediate feed rollers before stopping the registration rollers, preliminarily reducing the slack amount before the trailing edge passes through the intermediate feed rollers. This preliminary action prevents the flapping noise that would otherwise occur when the trailing edge is released, while maintaining the slack during the critical feeding phase to prevent sheet expansion noise.
Solution Approach 2:
The system dynamically adjusts the operation sequence of the rollers, transitioning from simultaneous operation (assistant operation) to sequential stopping. The intermediate feed rollers are stopped first, then the registration rollers are stopped afterward, creating a time-separated operation that adapts to different phases of sheet feeding to prevent both types of noise.
2Object-generated harmful factors
If the slack amount of the print sheet is reduced before the trailing edge passes through the feed rollers, then the flapping noise is prevented, but the sheet expansion noise may occur
Solution Approach 1:
The slack reduction is performed preliminarily but not completely before the trailing edge passes through. The intermediate feed rollers are stopped to reduce slack, but the registration rollers continue operating to maintain sufficient slack, creating a balanced state that prevents both flapping and expansion noises.
Solution Approach 2:
Different slack management strategies are applied to different parts of the system at different times. The intermediate feed rollers are stopped to locally reduce slack in that region, while the registration rollers continue to maintain slack in their region, creating localized quality control of the slack distribution.
Data Source
AI summary
A sheet supply device includes registration rollers for feeding a print sheet to a print unit, feed rollers for feeding a print sheet to the registration rollers, and a controller for controlling the registration rollers and the feed rollers. The controller starts first rotation of the feed rollers to contact a leading edge of the print sheet to the registration rollers to form a slack with a predetermined slack amount, stops the first rotation after the slack is formed, starts rotation of the registration rollers after the first rotation is stopped to reduce a slack amount of the slack, and starts second rotation of the feed rollers after the rotation of the registration rollers is started so as to make the slack remained until a trailing edge of the print sheet passes through the feed rollers. According to the sheet supply device, noises during feeding print sheets can be reduced.