Carriage Posture Stability via Dynamic Friction Control
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Solution Overview
Problem
Existing image recording apparatuses fail to effectively suppress the change in posture of the carriage during image recording, which is crucial for achieving high accuracy.
Innovation Solution
An image recording apparatus with a carriage that includes a drive section, a guide member, and a friction-force adjusting section using a motor and electromagnet to adjust dynamic friction forces between the guide member and the carriage, preventing rotational moments that alter the carriage's posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a sliding protrusion contacts with a guide piece to suppress carriage posture change, then the carriage posture stability is improved, but the suppression effect is delayed until after rotation is detected
Solution Approach 1:
The friction force adjustment section proactively adjusts the friction force between the carriage and guide member before the carriage posture changes occur. By detecting acceleration changes and preemptively modifying friction characteristics, the system prevents rotational moments from developing, rather than reacting after rotation is detected. This preliminary action eliminates the time delay inherent in detection-based correction systems.
Solution Approach 2:
The friction force adjustment section acts as an intermediary mechanism between the drive section and the carriage. By controlling the friction force at the contact interface between the carriage and guide member, it mediates the transmission of forces and moments, preventing excessive rotational moments from reaching the carriage and causing posture changes.
2Stability of the object's composition
If the friction force between the guide member and carriage is increased to suppress rotational moments, then the carriage posture stability is improved, but the driving efficiency and acceleration performance deteriorate
Solution Approach 1:
The friction force adjustment section dynamically varies the friction force between the carriage and guide member based on real-time acceleration detection. During acceleration and deceleration phases, the friction force is increased to suppress rotational moments. During constant velocity phases, the friction force is reduced to minimize resistance and maintain driving efficiency. This dynamic adjustment resolves the contradiction between stability and productivity.
Solution Approach 2:
The system changes the friction force parameter in response to acceleration changes. By detecting acceleration variations and correspondingly adjusting the friction force characteristic, the system adapts the contact conditions between carriage and guide member to match the operational phase, optimizing both stability during acceleration and efficiency during constant velocity operation.
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 solution effectively suppresses the change in posture of the carriage, ensuring accurate image recording by dynamically adjusting friction forces based on the carriage's acceleration and temperature, thereby maintaining stability during movement.
Implementation Method 1
a friction-force adjusting section configured to adjust a dynamic friction force acting between the guide member and the first contact portion in accordance with an acceleration of the carriage
Data Source
AI summary
An image recording apparatus includes a carriage which moves in a main scanning direction, a recording head which is installed on the carriage, and which records an image on a sheet, a drive section which has a motor, and which applies a driving force to the carriage, a guide member which guides the carriage in the main scanning direction, a first contact portion which is provided to the carriage and which contacts with the guide member, a second contact portion which is provided to sandwich a center of gravity of the carriage between the first contact portion and the second contact portion and which contacts with the guide member, and a friction-force adjusting section which adjusts a friction force acting between the guide member and the first contact portion in accordance with an acceleration of the carriage.