Edge Holder Retraction Region for Printing Apparatus Jam Protection
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Solution Overview
Problem
In printing apparatuses, medium jams can cause the carriage to press against the edge holders, leading to potential damage due to the inability to release the engaging state between the carriage and the edge holders, resulting in increased load and risk of damage during jam occurrences.
Innovation Solution
A retraction region is provided on the edge holders' engaging side, allowing them to move out of the engaging state with the guide rails during jams, reducing the load on the edge holders and preventing damage by enabling movement away from the engaging position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the edge holder is engaged with the guide rail to maintain positioning, then the positioning accuracy is improved, but the edge holder becomes vulnerable to damage during medium jams
Solution Approach 1:
The edge holder is designed to be movable along the guide rail rather than fixed, allowing it to dynamically adjust its position. During normal operation, it maintains engagement for positioning accuracy. During medium jams, it can move freely along the guide rail to avoid damage from carriage pressure.
Solution Approach 2:
The system separates the positioning function (guide rail engagement) from the damage protection function (movability along the rail). The guide rail serves dual purposes: providing positional guidance during normal operation and serving as a safety path during jams.
2Stability of the object's composition
If the edge holder maintains a fixed engaging state with the guide rail, then the structural stability is improved, but the load on the edge holder increases during jams
Solution Approach 1:
The edge holder transitions from a static fixed state to a dynamic movable state along the guide rail. This allows the system to maintain structural stability during normal operation while reducing force accumulation during jams by permitting movement.
Solution Approach 2:
The design pre-establishes a safety mechanism where the edge holder can move along the guide rail before damage occurs. This preliminary movability prevents excessive force buildup during medium jams.
3Reliability
If the edge holder is designed to be movable along the guide rail, then the damage risk during jams is reduced, but the positioning precision may deteriorate
Solution Approach 1:
The edge holder uses selective engagement with the guide rail - engaged during positioning operations for precision, disengaged or movable during jams for safety. This dynamic state change resolves the contradiction between precision and damage resistance.
Solution Approach 2:
The edge holder automatically moves along the guide rail in response to jam conditions without external intervention, providing self-protection while maintaining positioning capability during normal operation.
Data Source
AI summary
A printing apparatus includes a carriage supporting a liquid discharging head for discharging liquid onto a medium being transported, and caused to perform scanning along a width direction intersecting with a transport direction of the medium, a supporting member having a first guide rail extending along the width direction, and a support face capable of supporting the medium, a first engaging portion engaged with the first guide rail, and an edge holder having a plate member covering a first end portion of the medium on a first direction side in the width direction. On the first direction side of an end portion on the first direction side in the width direction of the first guide rail, a retraction region is provided in which the edge holder can be disposed in a state in which an engaging state between the first guide rail and the first engaging portion is released.