Gear Material Friction for Fast Power Switching
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Solution Overview
Problem
In ink-jet printing apparatuses, the time taken to initiate power transmission to the drive target is prolonged due to the disengagement of the planet gear from the cam gear during the switching process, leading to increased time before recording can commence.
Innovation Solution
Incorporating a movement gear made of synthetic resin material with glass fiber, which enhances the frictional engagement with both the first and second transmission gears, ensuring that the engagement between the first transmission gear and the movement gear is not easily released, thus maintaining power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a movement gear is used to switch power transmission between the first transmission gear and the second transmission gear, then the power transmission can be selectively switched, but the movement gear may disengage from the cam gear during standby state, lengthening the time to initiate power transmission
Solution Approach 1:
The movement gear is made of synthetic resin material containing glass fiber, which increases the frictional engagement between the movement gear and the transmission gears. This composite material prevents disengagement during standby state while maintaining the ability to switch power transmission selectively, thus reducing the time to initiate power transmission
2Adaptability or versatility
If the planet gear is moved to switch engagement between cam gear and pump roll holder gear, then power transmission can be switched, but the engagement position is not maintained stably, causing delay in power transmission start
Solution Approach 1:
The movement gear made of glass fiber-reinforced synthetic resin provides stable engagement with the transmission gears through increased friction. The material properties ensure that once engaged, the movement gear remains firmly engaged, maintaining reliable power transmission without unintended disengagement
3Ease of operation
If the planet gear is moved depending on motor rotation direction, then selective engagement is achieved, but external force during standby state causes disengagement, increasing startup time
Solution Approach 1:
The high-friction composite material of the movement gear ensures that engagement is maintained even when external forces are applied during standby state. The glass fiber reinforcement prevents the gear from being easily pushed out of engagement, ensuring immediate power transmission startup when needed
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 significantly reduces the time required to initiate power transmission to the drive target by maintaining stable engagement between gears, thereby shortening the overall startup time for recording processes.
Implementation Method 1
Incorporating a movement gear made of synthetic resin material with glass fiber, which enhances the frictional engagement with both the first and second transmission gears
Data Source
AI summary
A liquid jetting apparatus includes: a head unit; a cap; a cap lifter moving the cap between a capping position in which the cap makes contact with the head unit and an uncapping position in which the cap is separated from the head unit; a motor; a driven device; a first transmission gear transmitting power of the motor to the cap movement device; a second transmission gear transmitting the power of the motor to the driven device; and a movement gear moving between a position at which the movement gear engages with the first transmission gear and a position at which the movement gear engages with the second transmission gear depending on a rotation direction of the motor. At least one of the first transmission gear and the movement gear is made of a synthetic resin material containing glass fiber.