Sheet Conveying Device Dust-Proofing Gap Sealing
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Solution Overview
Problem
In image recording apparatuses, dusty environments can introduce sandy dust and debris into the device through gaps between the cover and housing, causing gear malfunctions and hindering sheet conveyance due to attachment on gears and rollers.
Innovation Solution
A sheet conveying device with a dust-proofing part attached to fill gaps between the movement member and housing, reducing dust introduction and attachment on drive transmission units, ensuring smooth roller rotation and sheet conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cover is made detachable to allow easy sheet removal, then the ease of operation is improved, but the reliability deteriorates due to dust entering through gaps
Solution Approach 1:
A dust-proofing part is introduced as an intermediary element between the cover and housing. This dust-proofing part includes a porous member that fills the gap between the cover and housing when the cover is in the closed position, preventing dust from entering the housing while allowing the cover to remain detachable for easy sheet removal.
Solution Approach 2:
The dust-proofing part utilizes a porous member made of foam material or the like. The porous structure allows the member to fill and seal gaps between the cover and housing effectively, preventing dust infiltration while maintaining the detachable nature of the cover for operational convenience.
2Reliability
If the cover is closed to protect internal components, then the reliability is improved, but the ease of operation deteriorates when sheet jamming occurs
Solution Approach 1:
The cover structure is segmented into a movable cover portion and a fixed housing portion. The cover can be selectively opened or detached to provide access to the conveying path for sheet removal, while the dust-proofing part ensures that closing the cover effectively protects internal components from dust.
3Reliability
If gaps between cover and housing are reduced to prevent dust entry, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Instead of reducing gaps through complex precision engineering, a porous dust-proofing member is used to fill the gaps. This approach achieves effective dust prevention while maintaining a simple cover structure that can be easily manufactured and assembled.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses the introduction of sandy dust and debris, preventing gear malfunctions and ensuring continuous sheet conveyance by sealing gaps with a dust-proofing part made of porous materials, maintaining device functionality in dusty environments.
Implementation Method 1
a dust proofing part attached to a position filling a gap between the movement member located in the first position and the housing
Data Source
AI summary
A sheet conveying device includes: a housing in which a conveying path of a sheet is formed; a roller configured to convey the sheet by rotation; a motor arranged inside of the housing; a drive transmitter configured to transmit a drive force of the motor to the roller; a movement member including a guide part configured to guide the sheet and at least a part of the drive transmitter, the movement member being movable to a first position closing the inside of the housing with respect to an outside of the housing and a second position different from the first position; and a dust proofing part attached to a position filling a gap between the movement member located in the first position and the housing.