Inkjet Printer Carriage Capping Control for Nozzle Drying
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Solution Overview
Problem
Inkjet printers face inefficiencies in the capping process for nozzle maintenance, requiring time to reposition the cap after a print job, which delays the start of the next print operation and can lead to nozzle drying issues if not addressed promptly.
Innovation Solution
An inkjet printer system with a cap moving mechanism and a controller that manages the capping process, allowing the carriage to move towards the cap mechanism only when a next print command is received, ensuring timely capping and minimizing nozzle drying by integrating a gear switching mechanism and ventilation control to prevent ink meniscus damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap is moved to cover the nozzles immediately after a print job, then nozzle drying is prevented, but the time required to reposition the cap delays the start of the next print operation
Solution Approach 1:
The carriage is moved to the non-printing area in advance during the standby process, before the capping operation is needed. This preliminary positioning allows the cap to be covered immediately when the capping command is executed, preventing nozzle drying while minimizing the time impact on the next print operation.
Solution Approach 2:
The system dynamically adjusts the carriage movement timing based on whether a next print command is received. If a command is received during the standby process, the carriage moves back to the printing area; otherwise, it proceeds to the non-printing area for capping. This dynamic decision-making optimizes the balance between nozzle protection and print readiness.
2Reliability
If the carriage moves to the non-printing area for capping, then the cap can cover the nozzles, but the gear switching mechanism adds complexity to the driving force transmission
Solution Approach 1:
The driving force transmission is segmented into multiple gear stages. A first gear transmits force in the printing direction, while a second gear transmits force in the non-printing direction. A displaceable gear switches between these two transmission paths based on the operational mode, allowing independent optimization of each direction's mechanics.
Solution Approach 2:
The displaceable gear acts as an intermediary element that mediates between the motor and the two different gear systems. It is pressed by a pressing member to engage with either the first gear or the second gear, enabling smooth switching between printing and non-printing operations without direct mechanical coupling changes.
3Reliability
If the pressing member constantly presses the displaceable gear in the non-printing direction, then the gear engagement is secure, but it prevents the carriage from moving in the printing direction
Solution Approach 1:
The pressing member's engagement force is dynamically controlled based on the operational phase. During the standby process, the pressing member maintains strong pressure to secure the displaceable gear in the non-printing direction. When a print command is received, the pressing member releases or reduces pressure, allowing the carriage to move freely in the printing direction.
Solution Approach 2:
The force parameter of the pressing member is changed according to the operational mode. The pressing force is strong during idle/capping operations to ensure secure gear engagement, and is reduced or released during printing operations to allow smooth carriage movement. This parameter change resolves the contradiction between secure engagement and ease of movement.
Data Source
AI summary
An inkjet printer has a printing head, a sheet conveying mechanism, a carriage mounting a printing head and configured to be reciprocally movable in a printing area and non-printing area. A cap is provided to be movable between a capping position an uncap position. A controller of the inkjet printer is configured to execute a printing process, a standby process, and a capping process in which the controller causes the carriage to move to the non-printing area and moves the cap from the uncap position to the capping position. The controller causes the carriage to move into the printing area when the next printing command is received after the standby process is finished and before the carriage moving process has been completed.