Inter-Axis Adjustment Mechanism for Roller Transport Stability
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Solution Overview
Problem
Existing medium transport mechanisms in liquid ejecting apparatuses, such as ink jet printers, face issues with oblique or meandering transportation due to unequal pressure contact forces between rollers, which can lead to image degradation and transportation jams, especially when elastic members undergo temporal changes.
Innovation Solution
A liquid ejecting apparatus with a transport mechanism featuring a driving roller and a pair of driven rollers that are pressed against the driving roller via the medium, equipped with an inter-axis adjustment mechanism allowing for precise adjustment of the distance between the rollers' rotation axes, ensuring equal pressure contact forces and preventing oblique transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pair of short rollers are pressed against a long roller by elastic members, then the medium can be transported by the transport roller pair, but if each roller has different pressure contact force, the medium will be transported in an oblique or meandering manner
Solution Approach 1:
The invention makes the transport roller pair adjustable by providing adjustment mechanisms that allow the inter-axis distance between rollers to be modified. This enables dynamic adaptation to compensate for pressure differences and elastic member temporal changes, resolving the contradiction between transportation stability and device complexity by introducing controlled adjustability.
Solution Approach 2:
The invention changes the physical parameters of the transport roller pair by allowing adjustment of the inter-axis distance between rollers. This parameter modification enables compensation for unequal pressure contact forces and elastic member degradation, maintaining reliable transportation without requiring complex real-time pressure control systems.
2Adaptability or versatility
If elastic members are used to press rollers against each other, then the transport mechanism can accommodate temporal changes, but the pressure contact force varies over time causing oblique transportation
Solution Approach 1:
The adjustment mechanism allows the transport roller pair to be dynamically reconfigured to compensate for temporal changes in elastic member properties. By enabling modification of the inter-axis distance, the system maintains transportation accuracy despite aging or degradation of elastic components over time.
Solution Approach 2:
The invention allows preliminary adjustment of the roller configuration to compensate for anticipated temporal changes in elastic members. By pre-adjusting the inter-axis distance before significant degradation occurs, the system maintains transportation precision throughout the elastic members' service life.
3Device complexity
If the inter-axis distance between rollers is fixed, then the device structure is simple, but unequal pressure forces cause oblique and meandering medium transport
Solution Approach 1:
The invention introduces adjustability to the transport roller pair by enabling modification of the inter-axis distance between rollers. This dynamic capability allows compensation for unequal pressure forces while maintaining relatively simple device structure, resolving the contradiction between complexity and transportation stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures proper and stable medium transportation by maintaining equal nipping forces across the medium, preventing oblique or meandering transport and ensuring precise image placement, even with temporal changes in the elastic members.
Implementation Method 1
A first roller of the transport roller pair is pressed against a second roller by an elastic member, such as a spring
Implementation Method 2
a transport mechanism in which both end portions in a width direction of a medium are pinched and pulled by a long roller and a pair of short rollers that are pressed against the long roller via the medium
Data Source
AI summary
A liquid ejecting apparatus, including: a liquid ejecting section that ejects a liquid at a medium; a transport mechanism that is disposed downstream of the liquid ejecting section in a transport direction of the medium and transports the medium, the transport mechanism having a driving roller that makes driving rotation, and a pair of driven rollers that are pressed against the driving roller via the medium and make driven rotation, the driven rollers being disposed with a space in a direction to cross the transport direction; and an inter-axis adjustment mechanism that is capable of adjusting an inter-axis distance between a rotation axis of the driving roller and a rotation axis of each roller of the driven rollers separately.