DEVELOPMENTAL RESEARCHES FOR SIZE CONTROLLER AND CONTROL MECHANISM OF RAW SILK

Abstract

A study was made to develop a size controller of raw silk by means of the analogue information processing technique coupled with a controlling mechanism.
The size controller consists of the following four functional units; a filter, a comparator, a logic and an output units.
Basic process technique for the size control is following. Namely, the size signal detected during the reeling is arranged by the filter. and the arranged signal is defined as the symbol V(t). V(t) is comparated with the set comparative voltage (V₂) for level of limit size for cocoon feeding, the voltage (V₁) for upper control limit size and the voltage (V₃) for lower control limit size. In case of V₁_??_V(t) or V₃_??_V(t), the stop instruction is given from the controller to the reel stopper. In case of V₂≥V(t), the instruction of cocoon feeding is given until V(t) rises higher than V₂. In case of V₁>V(t)>V₂, no instruction is given.
Mechanisms of cocoon feeding and reel stopper belonging to the reeling machine are operated on the instruction from the controller.
In real operation, the size of raw silk reeled by means of the proposed technique is so close to the target size that the variance and the standard deviation of size are very small.
It is confirmed that this control system based on the analogue information processing technique functions for the size control of raw silk during the reeling process.