Dual Roller Feeding Device for Stable Sheet Transport
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Solution Overview
Problem
Existing feeding devices for recording apparatuses face challenges in stably feeding sheets of varying sizes, as the feeding force decreases when the width of the sheet is small, leading to potential slipping and skewing issues due to uneven contact between rollers.
Innovation Solution
A feeding device with a loading unit, a feeding roller section having two rollers, and a holding member that adjusts to ensure the first roller contacts the sheet when its width is small, while the second roller is not in contact, allowing the rollers to conform to the sheet and maintain stable feeding force by using a hole in the loading unit to prevent contact when the sheet is narrow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two rollers are used in the feeding roller section, then the feeding stability is improved for wide sheets, but the feeding force decreases for narrow sheets because the non-contacting roller still contacts the driven roller and transmits feeding force
Solution Approach 1:
The feeding roller section is segmented into a first roller and a second roller mounted on a common shaft. The holding member independently adjusts the positional relationship between these rollers and the sheet, allowing selective contact based on sheet width. This segmentation enables the system to optimize roller contact configuration for different sheet sizes.
Solution Approach 2:
The holding member provides dynamic adjustment capability, moving the first and second rollers between a contact position (where both rollers contact the sheet for wide sheets) and a separate position (where only the first roller contacts narrow sheets). This dynamic reconfiguration prevents the non-contacting roller from transmitting feeding force to the driven roller, maintaining feeding force for narrow sheets while preserving stability for wide sheets.
2Device complexity
If the feeding roller section maintains fixed roller positions, then the structure is simple, but it cannot adapt to sheets of different widths, leading to skewing and slipping
Solution Approach 1:
The holding member introduces dynamic adjustability to the roller positioning system, enabling adaptation to different sheet widths while maintaining structural simplicity. The holding member can move the rollers between contact and separate positions, allowing the same structure to handle both narrow and wide sheets effectively without complex mechanisms.
Solution Approach 2:
The holding member serves multiple functions: it supports the shaft member with first and second rollers, enables positional adjustment between contact and separate positions, and prevents the non-contacting roller from contacting the driven roller. This multi-functionality allows a single component to provide adaptability across different sheet widths without significantly increasing device complexity.
Data Source
AI summary
A feeding device includes a loading unit for loading a sheet, a feeding roller section that has a shaft member on which a first roller and a second roller are disposed, and that feeds the sheet, and a holding member that holds the feeding roller section such that the first and second rollers are moved to a contact position where the first and second rollers are in contact with the sheet loaded on the loading unit and a separate position where the first and second rollers are separated from the sheet loaded on the loading unit. When the width of the sheet is less than or equal to a predetermined length, the first roller is in contact with the sheet whereas the second roller is not in contact with the sheet. The loading unit has a hole provided at a position opposite to the second roller.