Differences between Overedge and Lockstitch Machines

Differences between Overedge and Lockstitch Machines:

1. The overedge machine is a special-purpose machine used for finishing edges and some- times for seaming. It cannot topstitch, set zip- pers, make buttonholes, or backstitch. The lockstitch is an all-purpose machine that can be used for hemming, seaming, setting zippers, and many other sewing operations.

2. The overedge machine does not have a bobbin, bobbin case, or shuttle or rotary hook. Instead it has one or more loopers. The lockstitch machine has a bobbin.

3. The overedge machine has a pair of knives— upper and lower—that trim the edge immedi- ately before stitching.

4. The overedge machine has a longer presser foot and feed dogs that hold the fabric more firmly.

5. The overedge machine makes more stitches per minute (up to 8,500) and has less down- time because it does not have bobbins to be filled.

6. The basic overedge stitch has three threads; the lockstitch has two.

7. The lockstitch looks the same on both sides; the overedge does not.

8. The overedge stitch binds the fabric edge with thread; the lockstitch leaves the edges exposed.

9. Overedge stitches are more elastic and use five to six times as much thread as lockstitches.

10. Seams stitched on the overedge machine can- not be pressed open.