Roll-Sheet Feeding With Pre-Conveyor Reciprocation
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Solution Overview
Problem
Conventional recording apparatuses using rolled sheets face issues such as sheet jamming and wrinkling due to skew or slack, and the leading end of the sheet may be damaged when brought into contact with conveying rollers.
Innovation Solution
A recording apparatus with a support portion for the roll, a drive portion for rotating the roll in opposite directions, a conveying passage, and a conveyer, which performs a reciprocating operation to correct skew and slack of the sheet before it reaches the conveyer, avoiding direct contact with conveying rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the leading end of the sheet is brought into contact with the conveying roller to correct orientation, then the orientation of the sheet can be corrected, but the leading end of the sheet may be damaged
Solution Approach 1:
The patent introduces a guide roller as an intermediary component between the sheet and the conveying roller. The guide roller contacts the leading end of the sheet first and transfers it to the conveying roller, thereby correcting the sheet orientation without the conveying roller directly contacting or damaging the sheet's leading end.
Solution Approach 2:
The guide roller performs a preliminary action by first contacting and guiding the leading end of the sheet before the sheet reaches the conveying roller. This preliminary guidance corrects the sheet's orientation in advance, preventing damage when the sheet is subsequently conveyed.
2Device complexity
If the sheet is manually fed without automatic correction, then the device complexity is reduced, but sheet jamming and wrinkling occur due to skew or slack
Solution Approach 1:
The patent enables the feeding mechanism to automatically correct sheet orientation and eliminate slack without requiring complex manual intervention. The guide roller and conveying roller work together to self-correct skew and prevent jamming, improving feeding reliability while maintaining relatively simple device complexity.
3Ease of operation
If the leading end of the sheet is not parallel to the axial direction of the conveying roller, then the sheet can be fed, but the orientation of the sheet cannot be corrected and proper feeding fails
Solution Approach 1:
The guide roller serves as a mediator that accepts the sheet's leading end regardless of its initial orientation and transfers it to the conveying roller in a corrected, parallel alignment. This intermediary action enables easy sheet insertion while achieving precise orientation alignment.
Data Source
AI summary
A recording apparatus having a support portion that supports a roll having a wound sheet, a drive portion, a conveying passage, a conveyer, and a recording portion. The drive portion rotates the supported roll in a first direction to feed the sheet from the roll, and rotates the roll in a second direction to rewind the sheet onto the roll. The conveying passage guides the sheet fed from the roll in a feeding direction and has first and second positions upstream of the conveyer in the feeding direction. The drive portion performs, before the sheet reaches the conveyer, a reciprocating operation in which the drive portion rotates the roll in the second direction in response to a leading end of the sheet reaching the first position and rotates the roll in the first direction in response to the leading end which reached the first position reaching the second position.