Pressure regulator for ink-jetting pen

Abstract

The pressure regulator for ink jetting pen has one cover plate and one notch, between which one specific slot may be formed to collect and withdraw ink inside and around the air channel. The notch has one fine hole to form one air channel penetrating the wall of the ink cartridge, and in case that the negative pressure inside the ink jetting pen exceeds preset range, the negative pressure may be restored properly with the air inside the air channel acting like a bubble generator. The notch is distributed around the air channel and its bottom and cover vary to form concave and convex surface, so as to make the slot between the cover and the notch increase gradually with the increased distance to the air channel. Therefore, bubble in the slot is led from the opening of the cover plate to the ink jetting pen, ink pushed away by the bubble is collected and withdrawn by the attaching force and the air channel is blocked to maintain the negative pressure inside the ink jetting pen.

Description

technical field [0001] The invention relates to a pressure regulating device of an inkjet pen, in particular to a pressure regulating device which is provided with air holes capable of introducing an appropriate amount of outside air to prevent excessive negative pressure in the inkjet pen. Background technique [0002] An ideal inkjet pen pressure regulating device should meet at least three conditions: [0003] 1. Can precisely control and maintain the negative pressure in the inkjet pen; [0004] 2. When the air bubbles enter the ink cartridge of the inkjet pen, the liquid-air interface should be restored quickly to prevent the continuous entry of air, so that the inkjet pen can maintain an appropriate negative pressure; [0005] 3. Once the equilibrium state is reached, the cohesive force of the ink inside the pressure regulating device can be made smaller than the adhesion between the ink and the surface of the pressure regulating device...

AI Technical Summary

Problems solved by technology

Its necessary components are many and complex, so the assembly equipment and cost are relatively high

[0009] The related technology of using the valve body assembly to control the negative pressure of the inkjet pen, as well as the valve body disclosed in the US Patent No. 5,341,160, has a closed liquid and an obliquely inserted air guide tube. Its function is still to control the negative pressure in the inkjet pen. However, there are many components, and the assembly operation requires the assistance of precision equipment, so the manufacturing cost is also high

[0010] And because the technical means of the above-mentioned related technologies are too cumbersome, complicated and difficult to implement, how to further simplify components and increase the convenience of manufacturing is still a long-standing technical demand

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