Paste Supply Apparatus Inner Lid Suction Control
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Solution Overview
Problem
Existing paste supply apparatuses for screen printing machines face issues with paste droplet formation and interruption during operation due to the inability to prevent paste from flowing out of the container when the ejecting mechanism is stopped.
Innovation Solution
A paste supply apparatus with a pot holder, an ejecting member having a smaller diameter than the container, an annular protruding portion for generating suction power, and an ejecting member lifting unit that presses down the inner lid of the paste pot to control paste ejection and prevent droplets from forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the ejecting member is pressed down to eject paste from the through hole, then paste supply is achieved, but paste drops from the through hole when pressing is stopped
Solution Approach 1:
The patent introduces an inner lid as an intermediary component between the ejecting member and the paste. The ejecting member presses down the inner lid to control paste ejection, and the suction force lifts the inner lid to prevent paste drops. This intermediary mechanism allows precise control of paste flow without direct contact between the ejecting member and paste, resolving the contradiction between effective paste supply and prevention of unwanted paste drops.
Solution Approach 2:
The patent employs suction force (pneumatic principle) to lift the inner lid and prevent paste from dropping through the through hole after ejection. The suction mechanism creates negative pressure that counteracts gravity and surface tension effects causing paste drops, thereby maintaining reliable paste containment while allowing controlled ejection during printing operations.
2Reliability
If the ejecting member directly contacts the inner wall of the container for firm attachment, then stable paste ejection is achieved, but attachment requires time and effort
Solution Approach 1:
The inner lid serves as a mediator that transmits the ejection force from the ejecting member to the paste without requiring the ejecting member to firmly contact the container inner wall. This eliminates the time-consuming attachment process while maintaining stable paste ejection through the controlled movement of the inner lid.
Solution Approach 2:
The patent transforms the static attachment requirement into a dynamic system where the inner lid moves up and down in response to ejection and suction forces. This dynamic approach allows the system to achieve stable paste ejection through controlled motion rather than firm mechanical attachment, significantly reducing setup time and effort.
3Reliability
If the ejecting member is lifted after paste ejection, then paste drop prevention is achieved, but additional lifting mechanism is required
Solution Approach 1:
The patent uses suction force (pneumatic principle) to automatically lift the inner lid after paste ejection. This eliminates the need for a separate mechanical lifting mechanism, as the suction system performs both the ejection control and the lid retraction function. The dual-function pneumatic system prevents paste drops while maintaining device simplicity.
Solution Approach 2:
The suction mechanism serves multiple functions: it controls the ejection process by lifting the inner lid during printing, and it prevents paste drops by maintaining negative pressure after ejection. This multi-functional design achieves reliable paste drop prevention without adding separate lifting mechanisms, thereby avoiding increased device complexity.
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
Effectively prevents paste from dropping from the paste pot, reducing waste and improving productivity by ensuring controlled paste ejection and retraction into the container.
Implementation Method 1
a suction power generating mechanism which generates suction power in an internal space surrounded by the annular protruding portion
Data Source
AI summary
A paste supply apparatus includes: a pot holder which holds a paste pot including an inner lid movable in a container; an ejecting member; an annular protruding portion protruding downward from a lower surface of the ejecting member; a suction power generating mechanism which generates suction power in an internal space surrounded by the annular protruding portion; and an ejecting member lifting unit which moves up and down the ejecting member, The ejecting member lifting unit causes the ejecting member to press down the inner lid of the paste pot held by the pot holder to eject the paste from the through hole, and thereafter lifts the ejecting member which holds the inner lid by the suction power generated within the internal space of the annular protruding portion by the suction power generating mechanism.