Sheet Guiding Unit Separating Mechanism for Jam Removal
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Solution Overview
Problem
Conventional sheet-guiding unit separating systems in image forming apparatuses face challenges in preventing sheet jams and efficiently removing jammed sheets without interfering with the fixing nip or surrounding members, often requiring complex mechanisms and insufficient clearance, which can lead to conveyance issues and difficulty in accessing the fixing nip for removal.
Innovation Solution
A novel sheet-guiding unit separating mechanism is introduced, featuring a pair of sheet guiding units that pivot around a rotation fulcrum, with one unit displacing perpendicular to the conveying direction to separate from the fixing nip, allowing for easy access and removal of jammed sheets without interfering with surrounding members, and utilizing a biasing system and operation lever for seamless operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separating nail or plate is disposed close to the fixing roller or fixing belt, then sheet separation effectiveness is improved, but sheet jam removal becomes difficult and sheets are torn or partially left in the fixing device
Solution Approach 1:
The sheet guiding unit is designed to be movable rather than fixed, allowing it to be positioned close to the fixing nip during normal operation for effective sheet separation, and then moved away when sheet jams need to be removed. This dynamic positioning resolves the contradiction by enabling both effective separation and easy jam removal at different operational states.
Solution Approach 2:
The sheet guiding unit is separated into a movable component that can be independently positioned. This segmentation allows the sheet guiding function to be decoupled from the fixed structure, enabling the guiding unit to be moved away from the fixing nip area when jams occur, thus facilitating easy sheet removal while maintaining effective separation during normal operation.
2Productivity
If a sheet guiding unit is disposed immediately downstream of the fixing nip, then sheet conveyance control is improved, but access to the fixing nip for jam removal becomes difficult
Solution Approach 1:
The sheet guiding unit positioned downstream of the fixing nip is made movable, allowing it to be shifted away from the fixing nip area when sheet jams need to be removed. This dynamic positioning maintains effective sheet conveyance control during normal operation while enabling easy access to the fixing nip when jams occur.
3Ease of operation
If complex mechanisms are used to separate sheet guiding units from the fixing nip, then sheet jam removal access is improved, but device complexity increases
Solution Approach 1:
The sheet guiding unit is extracted as a separate movable component from the fixed structure. This extraction allows the guiding unit to be simply moved away from the fixing nip area without requiring complex separation mechanisms, thus improving access for jam removal while keeping the device structure simple.
4Ease of operation
If excessive clearance is provided between sheet guiding units and surrounding members, then sheet jam removal access is improved, but conveyance performance deteriorates due to insufficient clearance
Solution Approach 1:
The sheet guiding unit is designed with dynamic positioning capability, allowing it to be positioned close to surrounding members during normal operation to maintain good conveyance performance, and then moved away to create clearance when sheet jams need to be removed. This resolves the contradiction by providing both tight clearance for conveyance and adequate clearance for jam removal at different operational states.
Data Source
AI summary
A sheet guiding unit separating mechanism includes a pair of first and second sheet guiding units disposed facing first and second sides of a recording medium, respectively, to guide a recording medium discharged from a fixing nip downstream. One of the pair of sheet guiding units facing the first side includes a first sheet guiding element disposed immediately downstream of the fixing nip and a second sheet guiding element disposed downstream of the first sheet guiding element. The second sheet guiding element is displaceable substantially perpendicular to the conveying direction of the recording medium and separate from the sheet guiding unit facing the second side when the sheet guiding unit separating mechanism is moved to separate from the fixing nip. The first and second sheet guiding elements together pivot around a first rotation fulcrum to separate from the fixing nip after the second sheet guiding element is displaced.