Abstract of the Invention: " Double stroke mechanism" is commonly used for measuring cotton maturity value. This invention makes the double stroke easy, accurate, trouble free and long life tor components.Double stroke mechanism is used to compress the cotton in cotton chamber and measure the pressure of known air flow in two stage of compression. This invention contain two pneumatic cylinders and it is arranged in perpendicular manner, to interfier the stroke of one cylinder by another cylinder to achieve "Double Stroke'.
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