Abstract: Provided is a polyester-based monofilament for a toothbrush, the monofilament having exceptional flexibility (usage feel), durability (bristle breaking resistance), and restoration properties (bristle opening resistance). The present invention relates to: a polyester-based monofilament for a toothbrush, the monofilament being characterized in that polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT) are mixed at a proportion ranging from 85/15 to 65/35 in terms of weight ratio, and the shrinkage in boiling water is less than 1.0%; and a toothbrush in which the aforementioned polyester-based monofilament for a toothbrush is used in an erected bristle section.

Abstract: Yarn feeding and changing mechanism for circular knitting machine includes a plurality of yarn feed fingers selectively movable between operative and inoperative positions to feed yarn to the needles only when in operative position. A first rocking jack is connected to each yarn feed finger for moving the yarn feed fingers between operative and inoperative positions, and a slider member is connected to each first rocking jack. A second rocking jack is connected to each slider member and a plurality of pivotable selection members are provided for imparting rocking movement to the second rocking jacks in a predetermined pattern.