1 - Basic knowledge about the overlock machine

2. Configuration and function of throat plates for the overlock machine

(1) Configuration and function of the throat plate for the 1-needle 3 thread overlock machine • The throat plate for the overlock machine is as illustrated in Fig. 3.

1) Location of the auxiliary feed dog teeth (LAND) con be open land or closed land (shown below) • The auxiliary feed dog teeth help produce chain-off thread with consistency.

2) Over edging width •

The over edging width (Fig. 4) differs with the width of the over edging stitch. a. The stitch tongue width determines the over edging width. b. Thread tension varies according to the entire length. c. Needle slot

3) Location of a cloth cutting knife • The fabric is cut here. The cutting width is determined by the location of the knife.

4) Feed dog groove • The feed dog for the 1-needle 3 thread overlock machine comes in three different types ▪ feed dog with 1 row of teeth ▪ feed dog with 2 rows of teeth ▪ feed dog with 3 rows of teeth • Efficiency of feed and straight feeding capability of the feed dog increases with the number of teeth. • The feed dog with 1-row teeth is characterized by its ability to support sharp-curve sewing. 5) Throat plate slot • The slot prevents the feed mechanism from returning (in prevention of an uneven pitch). The slot also works to improve the differential effect.

Basic Knowledge About the Overlock Machine | © 2018 Superior Sewing Machine & Supply LLC