Sheet Feeding Guide Member for Jam Removal
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Solution Overview
Problem
Existing sheet feeding apparatuses face issues with sheet jamming and conveyance failure, leading to sheets being caught and torn when the storage is drawn out, as existing guiding surfaces are positioned downstream of the separation nip and do not effectively prevent upstream sheet catching.
Innovation Solution
A sheet feeding apparatus with an inclined guiding surface that directs sheets under the opening portion of the apparatus body, positioning the guiding surface downstream of the separation nip and upstream of the leading edge of the sheet, ensuring the sheet passes under the opening edge without catching, thus preventing tearing during storage draw-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the storage is drawn out to remove a jammed sheet, then the jammed state can be resolved, but the sheet may be caught in the apparatus body and torn
Solution Approach 1:
A guide member is introduced as an intermediary component between the sheet and the opening portion of the apparatus body. This guide member includes a guiding surface that directs the sheet to pass under the upper edge of the opening portion, preventing the sheet from being caught or torn during the storage draw-out operation.
2Device complexity
If a guiding surface is arranged downstream of the separation nip, then the sheet conveyance path is defined, but upstream sheet catching cannot be prevented
Solution Approach 1:
The guiding surface is positioned to perform preliminary action by guiding the sheet before it reaches the critical area near the opening portion. The guiding surface is inclined with respect to the draw-out direction and is positioned such that it guides the sheet to pass under the upper edge of the opening portion, preventing catching before it can occur during storage draw-out.
Data Source
AI summary
A sheet feeding apparatus includes an apparatus body including an opening portion, a storage configured to store a sheet, a pickup roller configured to pick up and feed the sheet, a separation conveyance unit including a separation nip, and a guide member including a guiding surface configured to guide the sheet such that the sheet passes under an upper edge of the opening portion while the storage is being drawn out of the apparatus body. A downstream end of the guiding surface in a sheet feeding direction is positioned downstream of the separation nip in the sheet feeding direction. An upstream end of the guiding surface in the sheet feeding direction is positioned upstream in the sheet feeding direction of a leading-edge position of the sheet stored in the storage.