Separation Unit Bearing Geometry to Prevent Sheet Feeder Detachment
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Solution Overview
Problem
Existing sheet supplying apparatuses in recording and image reading devices face issues with detachment of the separation unit due to an open upper side of the bearing portion, leading to unintentional detachment and requiring complex posture adjustments during mounting.
Innovation Solution
A sheet supplying apparatus with a detachable separation unit featuring a bearing with a width-adjustable opening, allowing for improved detachment operability by rotating the separation unit about a shaft portion, ensuring stable mounting and easy replacement of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bearing portion is open upward to allow easy mounting, then the ease of operation is improved, but the separation unit may become unintentionally detached when lifted
Solution Approach 1:
The bearing opening is designed with asymmetric width characteristics: the width in the lifting direction (first direction) is smaller than the shaft portion width, preventing unintentional detachment, while the width in the rotational direction (second direction) is larger than the shaft portion width, enabling easy mounting and rotation operations
2Ease of operation
If the bearing opening width is increased to facilitate mounting, then the ease of operation is improved, but the separation unit becomes unstable and may detach
Solution Approach 1:
The bearing opening employs asymmetric width design where the dimension parallel to the shaft portion (first direction) is constrained to be smaller than the shaft width for stability, while the perpendicular dimension (second direction) is enlarged to facilitate mounting operations
3Reliability
If the bearing opening is made smaller to prevent detachment, then the reliability is improved, but the ease of mounting becomes difficult
Solution Approach 1:
The bearing opening is designed with asymmetric dimensions: the width in the lifting direction is reduced below the shaft portion width to prevent detachment, while the width in the rotational direction is increased above the shaft portion width to enable easy mounting
Data Source
AI summary
A sheet supplying apparatus includes, an apparatus body having a shaft portion; a sheet stacking portion; a supplying member; a separation unit that moves between a first position in which the separation unit contacts and separates the sheet supplied from the sheet stacking portion, and a second position in which the separation unit is rotated about the shaft portion from the first position relative to the apparatus body; and a bearing provided in the separation unit, detachable from the shaft portion, and having an opening with a width of a first length in a width direction. A width of the shaft portion in a first direction is greater than the first length, while a width of the shaft portion in a second direction is smaller than the first length.