Sheet Feeding Device Roller Contact Control
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Solution Overview
Problem
Conventional sheet feeding devices face issues with oblique movement and improper feeding of sheets, particularly when handling long sheets, leading to potential slip and non-feeding errors due to the separation of feeding rollers and obliquely feeding rollers.
Innovation Solution
A sheet feeding device with a contact-and-separation mechanism for the first and obliquely feeding roller pairs, allowing for adjustable states between nipping and separation, which enables controlled feeding by changing the states of the roller pairs to prevent oblique movement and ensure proper alignment and feeding of sheets of varying lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the feeding roller pair and obliquely feeding roller pair are separated to handle long sheets, then the sheet can be fed without obstruction, but the sheet may slip and improper feeding occurs
Solution Approach 1:
The roller pairs are designed to dynamically change their contact state with the sheet between nipping and separation, allowing the system to adapt to different sheet lengths while maintaining reliable feeding through controlled contact states
2Manufacturing precision
If the feeding is stopped and resumed to adjust sheet position, then the leading end position variation is corrected, but slip occurs between feeding portion and sheet
Solution Approach 1:
The feeding process uses periodic contact-and-separation cycles of the roller pairs, where the rollers periodically nip and release the sheet to maintain position control without causing slip, enabling precise positioning while avoiding the harmful effects of complete stopping and resuming
3Manufacturing precision
If the obliquely feeding roller pair is used to correct oblique movement, then side alignment is improved, but the nip separation causes improper feeding
Solution Approach 1:
The obliquely feeding roller pair dynamically adjusts its contact state with the sheet, nipping during alignment correction and separating during straight feeding, thus achieving precise side alignment while preventing improper feeding through controlled dynamic operation
Data Source
AI summary
A sheet feeding device includes a sheet feeding portion, a side end regulating portion, a feeding portion, first and second feeding roller pairs, an abutment member, an obliquely feeding roller pair, and first and second contact-and-separation mechanisms. Feeding of a long sheet is stopped after the sheet is fed to an upstream side of the second feeding roller pair by the feeding portion, and then is resumed in a state in which the first feeding roller pair is changed from a separated state to a feedable state and in a state in which the obliquely feeding roller pair is put in a separated state, and then the sheet is fed to the second feeding roller pair. A short sheet fed by the first feeding roller pair is obliquely fed by the obliquely feeding roller pair and then is fed to the second feeding roller pair.