Sheet Conveying Device Buffer Unit Slack Positional Deviation
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Solution Overview
Problem
Existing sheet conveying systems face challenges in efficiently correcting positional deviations during the conveyance of continuous sheets, often requiring temporary halting of rollers, which can lead to sheet pulling, loosening, or scratches, and extending the correction time.
Innovation Solution
A sheet conveying device incorporating a buffer unit to form slack in the sheet, allowing for positional deviation correction by a guide unit without halting all conveying rollers, thus maintaining continuous sheet conveyance and reducing correction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If all conveying rollers are halted to correct positional deviation, then the sheet can be guided accurately by the guide member, but the correction time is extended and sheet quality may be degraded due to pulling or scratches
Solution Approach 1:
The conveying system is divided into multiple independent rollers. Instead of halting all rollers, only the downstream rollers are halted while upstream rollers continue to convey the sheet. This segmentation allows selective stopping to enable positional deviation correction without complete conveyance interruption, reducing correction time while maintaining accuracy.
Solution Approach 2:
The buffer unit creates slack in the sheet in advance before the guide unit performs the actual guiding operation. This preliminary slack formation allows the guide unit to correct positional deviation without requiring all rollers to halt simultaneously, as the slack provides the necessary flexibility for the correction maneuver.
2Manufacturing precision
If all conveying rollers are halted to correct positional deviation, then the guide member can effectively guide the sheet edge, but scratches or marks may be left on the sheet due to time lag in stopping multiple rollers
Solution Approach 1:
The roller system is segmented into upstream and downstream groups with different operational states. Upstream rollers continue conveying while downstream rollers are halted, eliminating the time lag problem that causes scratches. This selective halting ensures the guide member can accurately guide the sheet edge without creating harmful marks.
Solution Approach 2:
The buffer unit acts as an intermediary element that creates slack between the sheet and the conveying rollers. This slack serves as a buffer that prevents direct contact and friction between the rollers and sheet during the correction process, thereby preventing scratches and marks while still enabling accurate alignment by the guide member.
3Manufacturing precision
If the guide member presses against the sheet edge to correct positional deviation, then alignment is improved, but the sheet may be pulled or loosened if rollers are halted simultaneously
Solution Approach 1:
The buffer unit creates slack in the sheet in advance before the guide unit performs correction. This preliminary slack formation prevents the sheet from being pulled or loosened during the correction process, as the slack absorbs the tension changes while the guide member presses against the sheet edge to improve alignment.
Solution Approach 2:
By segmenting the roller operation into continuous upstream conveyance and halted downstream conveyance, the system maintains sheet tension stability. The continuous operation of upstream rollers keeps the sheet taut while the downstream halt allows the guide member to apply pressure for correction without causing the sheet to pull or loosen.
Data Source
AI summary
A sheet conveying device that more appropriately corrects a positional deviation for a sheet and reduces the time required for a correction of the positional deviation. The sheet conveying device includes a guide unit, for guiding the edges of the sheet that is conveyed and for correcting a positional deviation, and a buffer unit located upstream of the guide unit to form a slack for the sheet, so that one part of the slack formed by the buffer unit is guided by the guide unit. The buffer unit includes an upstream roller pair and a downstream roller pair, and a slack for the sheet is formed between the upstream roller pair and the downstream roller pair.