Printing Apparatus Sheet Guide Prevents Roller Jamming
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Solution Overview
Problem
In printing apparatuses where recording sheets are fed from roll sheets, slack portions in the roll sheet container can jam the transport roller, causing it to fail to rotate.
Innovation Solution
The printing apparatus includes a second sheet guide with a projection and a pushing section that protrude toward the roll sheet container and extend along the outer circumference of the roll sheet, respectively. This configuration prevents slack portions from being fed into the sheet route, thereby preventing jamming of the transport roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple sheet guide structure is used, then device complexity is reduced, but slack portions can jam the transport roller causing operational failures
Solution Approach 1:
The second sheet guide is positioned to preemptively intercept and redirect slack portions of the roll sheet before they can reach and jam the transport roller. By acting in advance, the sheet guide prevents the harmful event from occurring, maintaining reliability without adding complex control mechanisms.
Solution Approach 2:
The second sheet guide serves as an intermediary element between the roll sheet container and the transport roller. It mediates the interaction by capturing and redirecting slack portions, preventing direct contact between the problematic slack sheet and the transport roller, thus resolving the jamming issue.
2Reliability
If the second sheet guide extends far along the roll sheet container, then it can effectively intercept slack portions, but device complexity and space requirements increase
Solution Approach 1:
The second sheet guide extends just far enough to perform the preliminary action of intercepting slack portions at their origin point near the roll sheet container. This minimal extension achieves effective interception without unnecessary structural complexity or space consumption.
Solution Approach 2:
The second sheet guide concentrates its functional presence only in the critical local area where slack portions originate and pose a threat. Rather than extending uniformly throughout the entire system, it provides targeted intervention precisely where needed, optimizing the balance between effectiveness and simplicity.
Data Source
AI summary
A printing apparatus includes: a roll sheet container that contains a roll sheet around which a recording sheet is wound; a first sheet guide that makes contact with a first surface of the recording sheet; a second sheet guide that makes contact with a second surface of the recording sheet; and a transport roller that transports the recording sheet. The first and second sheet guides are disposed so as to face each other to form a sheet route along which the recording sheet is to pass. The transport roller transports the recording sheet that passed along the sheet route. The second sheet guide includes: a projection that protrudes toward the roll sheet container; and a pushing section that extends from the projection along an outer circumference of the roll sheet and in a direction away from the first sheet guide.