Abstract
This article gives an account of theoretical treatment of the function of the flyer presser. It points out that the main factor which generates the presure of the presser is the moment produced around the central axis of the hollowleg by the deviation of the position of the gravity center in the presser; and that the character of the position of contact between the presser paddle and the sliver bobbin differs in the two parts.
The pressure of the presser on the sliver bobbin during winding is obtainable by balancing those moments around the central axis of the hollowleg which result from reaction force, frictional force, roving tension and air resistance acting on the presser. We call this pressure the “winding pressure of the presser, ” as distinguished from the commonly used presser pressure which does not take the frictional force and roving tension into account.
An analysis of the pressure of the presser has made it clear that _??_ value as to the shape of the presser must be determined from 140°_??_165° after consideration of various conditions; that three types of pressure of presser [descendant, ascendant and almost constant corresponding to θ or γ] are obtainable by α value; and that these gradients can be changed at will.
The pressure of various types of flyer pressers has been examined. The date obtained from the examination have shown that the magnitude of the pressure of the presser can be classified according to the type of the flyer frame; and that the gradient of the pressure curve depends upon wa as well as α and _??_.
