Importance

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Abstract

A damper assembly comprises a cylinder enclosing a plunger mounted on a piston rod and associated with an auxiliary plunger which is yieldably held against the main plunger by a spring. Ascent of the cylinder relative to the plunger allows a high damping force to be obtained by causing the damping liquid to pass around the exterior of the main plunger, along a first flow path, whereas descent of the cylinder allows the spring to yield and to open a larger cross-section third flow path between the auxiliary plunger and the main plunger for a lower damping force to be obtained. The damping force exerted in the first-mentioned direction is limited by the effect of a pressure relief valve which opens to allow flow of hydraulic fluid through the auxiliary plunger along a second flow path once a predetermined damper force has been attained. The cylinder is coaxially surrounded by a pre-load spring. The damper is incorporated in an anti-bounce package support in a yarn winder.

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First Claim