Re-carrying Path Recessed Part Absorbs Sheet Bowing
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Solution Overview
Problem
Conventional image forming devices face the issue of sheet-like media being jammed near re-carrying rollers due to bowing and pressure against lower walls, leading to folding and jamming.
Innovation Solution
The implementation of a recessed part on the re-carrying path between the bending part and re-carrying rollers, or a bended carrying surface on the upstream side end of the second path, to absorb bowing and prevent jamming by reducing contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sheet-like medium passes through the first path and bends in the bended part, then the medium is carried back toward the image formation unit, but the medium bows downward and is pressed strongly against the lower wall causing folding and jamming near the re-carrying roller
Solution Approach 1:
A recessed part is provided in advance on the second path between the bending part and the re-carrying rollers. This recessed part acts as a cushioning structure that absorbs the bowing force of the sheet-like medium before it reaches the re-carrying rollers, preventing the medium from being pressed strongly against the lower wall and causing folding or jamming.
2Device complexity
If the second path is formed with a straight configuration, then the structure is simple, but the sheet-like medium experiences strong pressure against the lower wall causing folding and jamming
Solution Approach 1:
Instead of changing the entire second path structure, a recessed part is locally provided only in the specific area where the sheet-like medium experiences bowing force. This localized modification reduces the pressure on the medium without significantly increasing the overall structural complexity of the path.
Data Source
AI summary
An image forming device, comprising: a main body; an image formation unit; and a re-carrying path along which a sheet-like medium on which the image has been formed is carried again to the image formation unit. In this configuration, the re-carrying path comprises: a first path formed to extend downward; a bending part formed to bend from a lower end of the first path toward an upstream side of the image formation unit; and a second path formed to extend from the bending part toward the upstream side of the image formation unit. A pair of re-carrying rollers which carry the sheet-like medium are provided on the second path. A recessed part formed to be recessed downward with respect to a common tangential line of the pair of re-carrying rollers is provided on the second path between the bending part and the pair of re-carrying rollers.