Sheet Conveying Apparatus Merging Pressing and Detection
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Solution Overview
Problem
Existing sheet conveying apparatuses face challenges in downsizing and preventing skew feed due to the separate arrangement of switch levers and pressing members, which require additional space and can cause sheet misalignment.
Innovation Solution
A sheet conveying apparatus with a guide portion, a pressing portion to curve the sheet, and a moving portion with abutment portions that overlap with the pressing portion in the width direction, allowing for detection of the sheet's movement to prevent skew feed while enabling downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switch levers and pressing member are arranged at different positions in conveying direction, then detection function is achieved, but apparatus size increases
Solution Approach 1:
The patent combines the detection function (switch lever) and sheet pressing function into a single integrated component structure. The moving portion serves both as the detection element that detects sheet passage and as the pressing element that applies pressure to the sheet, eliminating the need for separate arrangements and reducing apparatus size.
2Reliability
If switch levers are arranged on lateral sides of pressing member, then detection is possible, but skew feed occurs due to resistance forces
Solution Approach 1:
The patent positions the abutment portions asymmetrically with respect to the sheet width, with one abutment portion on one side of the sheet and another abutment portion on the other side. This asymmetric arrangement ensures that resistance forces are applied symmetrically to the sheet, preventing skew feed while maintaining detection capability.
3Stability of the object's composition
If pressing member curves sheet to increase rigidity, then sheet stability improves, but apparatus complexity increases
Solution Approach 1:
The patent merges the pressing member that curves the sheet to increase rigidity with the detection mechanism into a single integrated structure. The moving portion that detects sheet passage also serves as the pressing element, eliminating the need for separate pressing mechanisms and reducing overall apparatus complexity while maintaining sheet stability.
Data Source
AI summary
A sheet conveying apparatus includes a sheet conveying member; a guide portion configured to define a sheet conveying path; a pressing portion configured to press the sheet to curve the sheet as viewed in a sheet conveying direction in the sheet conveying path; and a moving portion movable by an edge of the sheet passing through the sheet conveying path and arranged so that at least a part of a movable range of the moving portion is overlapped with the pressing portion. The moving portion includes a first abutment portion configured to abut against the sheet passing through the sheet conveying path on one side in the width direction with respect to a conveyance center of the sheet conveying member and a second abutment portion configured to abut against the sheet passing through the sheet conveying path on the other side with respect to the conveyance center.