Basic Knowledge of Sewing - Overlock stitch
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Course overview
- Course aim
- Focuses on the explanation of the main adjustment points (adjustment methods) that affect the formation of seams in overlock stitch.
The purpose of this course is to provide participants with the knowledge and skills to deal with stitching problems such as stitch skipping that may occur in actual sewing operation. - Target persons
- Sewing machine maintenance staff / Intermediate-level sewing operator
- Lecture time
- Approximately 300 minutes (Total video play time： Approximately 100 minutes)
- Supported language
- English / Japanese
Course details
Chapter 1 : "Basic Knowledge of Sewing" Overlock stitch Edition
Learn about the seams that can be sewn with industrial sewing machines and the sewing problems that can easily occur.
Table of contents
- 1.1Types of Stitches
- 1.2Types of chainstitches
- 1.3Problems experienced in sewing process
- 1.4Summary
Chapter 2 ：Characteristics of Overlock stitch
Learn about the characteristics of overlock stitch seam shapes and how overlock stitch seams are formed.
Table of contents
- 2.1Seam shape and characteristics
- 2.2Threading
- 2.3Stich formation in overlock stitch sewing
Chapter 3 ：Adjustments
This course teaches how to adjust the needle bar, looper, needle guard, feed dog, knife, and looper thread take-up cam, which are the main adjustment points to form the seam of overlock stitch sewing machine.
Table of contents
- 3.1Needle height
- 3.2Alignment of lower looper
- 3.3Upper looper arm position
- 3.4Upper looper position
- 3.5Double Chainstitch Looper Arm Length
- 3.6Alignment of double chainstitch looper
- 3.7Needle guard height position and clearance adjustment
- 3.8Feed dog height
- 3.9Feed dog inclination
- 3.10Adjustment of differential ratio
- 3.11Knife arm shaft position
- 3.12Upper knife and lower knife position and overedging width
- 3.13The looper thread take-up cam position
- 3.14Looper thread take-up position and looper thread guide position
Chapter 4 ：Sewing problems and stitch skipping
Learn how to identify factors and take countermeasures when stitch ploblems or stitch skipping occur.
Table of contents
- 4.1Lower looper does not enter the needle thread loop properly
- 4.2Needle does not enter the upper looper thread loop properly
- 4.3Upper looper does not enter the lower looper thread loop properly
- 4.4Summary of sewing problems caused by incorrect settings
Chapter 5 ：Summary
Summary of overlock stitch.
