Dual Door Gap Mechanism for Conveyance Apparatus
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Solution Overview
Problem
In medium conveyance apparatuses with outer and inner doors, the risk of damage occurs due to contact and rubbing between the doors and medium support members when the outer door is closed with the inner door open, as existing structures do not adequately prevent these interactions.
Innovation Solution
The apparatus incorporates a contact protruding part on one door and a contact target part on the other, forming a gap when the doors are closed, which prevents direct contact and rubbing between the door surfaces, and includes a second conveyance path for increased accessibility and reduced damage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outer door is closed with the inner door open after dealing with medium jam, then the operator can access the conveyance path for jam removal, but the outer surface of the inner door and the inner surface of the outer door may come into contact and rub against each other causing damage
Solution Approach 1:
A contact protruding part is provided on one door and a contact target part on the other door. These intermediary contact elements engage with each other first when the outer door is closed, preventing the main door surfaces from coming into contact. This mediator mechanism allows the door closing operation to proceed without causing rubbing damage between the inner door outer surface and outer door inner surface, while still permitting the inner door to remain open for jam access.
2Productivity
If medium support conveying members such as driving roller and driven roller are disposed on the door surfaces, then the conveyance path is formed, but the rollers may be damaged due to contact and rubbing when doors are improperly closed
Solution Approach 1:
The contact protruding part and contact target part act as intermediaries that prevent direct contact between the door surfaces where medium support conveying members are disposed. When the outer door is closed, these intermediary elements engage first, creating a stop that prevents the door surfaces from rubbing against each other and damaging the driving roller, driven roller, or other conveying members positioned on the door surfaces.
Solution Approach 2:
The contact protruding part and contact target part are positioned to engage in advance before the door surfaces can come into contact. This preliminary engagement creates a mechanical stop that prevents the harmful rubbing action from occurring in the first place, protecting the conveying members from damage before it can happen.
3Reliability
If a gap is maintained between inner door and outer door when closed, then contact and rubbing damage is prevented, but the sealing and structural integrity may be compromised
Solution Approach 1:
The contact protruding part and contact target part serve as intermediary elements that maintain the necessary gap between the inner door and outer door while still providing a defined closing position. These elements engage to create a mechanical stop that prevents the door surfaces from contacting each other, thereby maintaining the protective gap without compromising the overall structural integrity of the door assembly.
Data Source
AI summary
A medium conveyance apparatus includes an inner door openable and closable with respect to an apparatus body, an outer door located on an outer side of the inner door and openable and closable with respect to the apparatus body. One of the inner door and the outer door includes a contact protruding part. The other of the inner door and the outer door includes a contact target part configured to come into contact with the contact protruding part. The contact protruding part and the contact target part are disposed forming a gap in the region between the inner door and the outer door in a state where the contact protruding part and the contact target part are in contact with each other when the outer door is rotated in a closing direction with the inner door open.