Home Science · Apparel Construction
Which of the following statements most accurately explains the mechanical synergy and functional role of the Bobbin and Bobbin Case within the lower thread system of a sewing machine?
- 1The Bobbin is the flat metal plate that provides a stable surface for the fabric to rest on, while the Bobbin Case is the stitch length regulator used to adjust the size of the stitches for decorative sewing.
- 2The Bobbin Case is the metal attachment that presses the material against the feed dogs, whereas the Bobbin is the needle clamp that ensures the lower thread is fixed correctly in the machine head.
- 3The Bobbin acts as a rotating shuttle that catches the loop formed by the needle thread, while the Bobbin Case serves as the spool pin to prevent the lower thread from breaking or tangling during high-speed operation.
- 4The Bobbin functions as a small spool holding the lower thread and is placed inside the Bobbin Case, which controls thread tension and ensures smooth release to work simultaneously with the upper thread for the formation of balanced lockstitches.✓
Correct answer
The Bobbin functions as a small spool holding the lower thread and is placed inside the Bobbin Case, which controls thread tension and ensures smooth release to work simultaneously with the upper thread for the formation of balanced lockstitches.
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