Adjustable Gripper for Liquid Jetting Medium Transport
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Solution Overview
Problem
Existing medium transporting devices face issues with medium lifting and wrinkling due to uneven grip pressure distribution, particularly in liquid jetting devices using transport drums, where the gripper's fixed position leads to mismatched end positions and varying adsorption pressures.
Innovation Solution
A medium transporting device with a gripping unit, a first adsorption supporting unit for the leading end, a second adsorption supporting unit for the trailing end with reduced pressure, and a medium position moving unit to align the medium, ensuring both ends are supported and pressure is uniformly applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed position gripper is used in the transport drum, then the device complexity is reduced, but medium lifting and wrinkling occur due to mismatched end positions
Solution Approach 1:
The gripper position is made adjustable along the circumferential direction of the transport drum, allowing dynamic repositioning to match medium ends. This resolves the contradiction by enabling the simple fixed-position structure to adapt to different medium positions, preventing lifting and wrinkling without adding complex positioning systems.
Solution Approach 2:
The position parameter of the gripper is made variable to match the medium end position. By adjusting the gripper's circumferential position, the system adapts to different medium configurations, maintaining medium flatness while keeping the overall device structure simple.
2Stability of the object's composition
If the gripper position is adjusted to match medium ends, then medium lifting is suppressed, but the device complexity increases
Solution Approach 1:
The gripper position is made adjustable along the circumferential direction of the transport drum, allowing dynamic repositioning to match medium ends. This resolves the contradiction by enabling the simple fixed-position structure to adapt to different medium positions, preventing lifting and wrinkling without adding complex positioning systems.
3Reliability
If medium transportation is stopped to avoid contact with liquid jetting head, then liquid jetting head protection is improved, but productivity decreases
Solution Approach 1:
The medium is supported at multiple points (leading end, trailing end, and non-end region) to maintain a flat, stable position throughout transportation. This equipotential support prevents medium lifting that would cause contact with the liquid jetting head, allowing continuous transportation without stops and maintaining both protection and productivity.
4Stability of the object's composition
If adsorption pressure is increased to suppress medium lifting, then medium support stability is improved, but medium wrinkling occurs due to uneven pressure distribution
Solution Approach 1:
Different adsorption pressures are applied to different regions: higher pressure at the trailing end and non-end region, and lower pressure at the leading end. This local quality differentiation provides stable support without causing wrinkling, as each region receives appropriate pressure based on its specific requirements.
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
The solution effectively suppresses medium lifting and wrinkling by ensuring both ends are securely gripped and pressure is evenly distributed, enhancing the stability and productivity of medium transportation in liquid jetting devices.
Implementation Method 1
a first adsorption supporting unit which adsorbs and supports a trailing end region of the medium and a second adsorption supporting unit which adsorbs and supports a non-end region of the medium
Data Source
AI summary
A medium transporting device and a liquid jetting device, which can suppress the lifting of both ends of a medium in a width direction of a medium and can suppress the occurrence of wrinkling of the medium, are provided. The medium transporting device includes a gripping unit that grips a leading end region of a medium, a medium supporting unit that has a first adsorption supporting unit which adsorbs and supports a trailing end region of the medium and a second adsorption supporting unit which adsorbs a non-end region of the medium and generates an adsorption pressure less than an adsorption pressure generated by the first adsorption supporting unit, a medium position moving unit that moves a position in a medium width direction in the medium width direction, and a medium transporting unit that transports the medium. Regarding the width direction, the first adsorption supporting unit has a length, which is obtained by adding a length twice a moving distance of the medium to a medium length, and a distance from a center position in the width direction to one end in the width direction is the same as a distance from the center position in the width direction to the other end in the width direction.