Abstract
The theme of this article is to discuss the productivity of an automatic winder. At first, the theoretical efficiency of machine77 is defined and then the theoretical numbers of drums p0 to which one worker operates is defined.
R expressed as R=p0·ν/νs was considered as an index of the productivity of winder, where V is the yarn speed and νs is the standard speed of yarn.
Winders are classified as the following five typical types :
(1) The winder operated by hand.
(2) The winder comprising more than fifty drums to which one knotting unit operates and it knots the yarns from a package and a new cop, but does not knot a broken yarn.
(3) The winder similar to type (2), but attached with an automatic cop feeding device and auto-doffing device.
(4) The winder comprising about ten drums to which one knotting unit operates and knots the broken ends when yarn breaks.
(5) The winder of which each drum is operated by each knotter and attached with the automatic cop feeding device.
η, ps and R are shown as a function relating to the rate of yarn breakage α for each type of winder above mentioned. According to the increasing, the specific characteristics of η, ps and R will vary. For instance, the values of the winder of the type (2) and (3) are good when α is less than 0.2, but when the value of α is 0.2 or more, they will decline in the bad condition. On the contrary, the winders of the types (4) and (5) maintain good condition, even when α is more than 0.2. It was ascertained that the automatic cop feeding device showed good efficiency.
