Question

Feed mechanism depends on the following part of sewing machine

• A. Shuttle
• B. Feed dog
• C. Fly wheel
• D. Tension guide

Hint:

• Feed mechanism} in a sewing machine moves the fabric between stitches.
• The most common type is drop feed}, which uses feed dogs}.
• Feed dogs} are toothed components below the needle plate that rise, grip the fabric, move it, and then retract.
• Shuttle/bobbin case is for stitch formation. Flywheel is for driving the machine. Tension guides control thread tension.

Answer 1

The Correct Option is B

The feed mechanism in a sewing machine is responsible for moving the fabric forward (or backward/sideways for some stitches) under the needle between stitches, to create a seam of consistent stitch length. Let's examine the parts listed:

• (a) Shuttle (or Bobbin case/Rotary hook): The shuttle system (in lockstitch machines) is part of the stitch forming mechanism. It holds the bobbin thread and interloops it with the needle thread to form a lockstitch. It does not directly control fabric movement.
• (b) Feed dog (Feed dogs): This is the primary component of the most common type of feed mechanism, called a "drop feed" or "intermittent feed" system. Feed dogs are toothed metal strips located beneath the needle plate. They rise up through slots in the needle plate, grip the underside of the fabric, move it horizontally by a set distance (stitch length), then drop down below the plate and return to their starting position to repeat the cycle for the next stitch. The movement of the feed dogs is what transports the fabric.
• (c) Fly wheel (Hand wheel): The flywheel (or hand wheel) is used to manually operate the sewing machine or to provide momentum for smooth operation when motor-driven. It is part of the main drive system but not the feed mechanism itself.
• (d) Tension guide (Tension discs/assembly): Tension guides and discs are part of the thread tensioning system for the needle thread (and sometimes bobbin thread). They control the tension of the thread as it is fed to the needle, which is crucial for proper stitch formation, but they do not move the fabric.

The feed mechanism primarily depends on the action of the feed dog (in conjunction with the presser foot, which holds the fabric down against the feed dogs). Different types of feed mechanisms exist (e.g., drop feed, needle feed, puller feed, differential feed), but the feed dogs are central to the most common type used for general sewing. \[ \boxed{\text{Feed dog}} \]