Sewing Machine Common Parts Glossary

Bobbin

The bobbin is a small thread reel that holds the bottom thread in the bobbin case. The needle dips down into the bobbin case and loops the bobbin thread and needle thread to form a locked stitch.

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Bobbin case

Located under the needle plate, the bobbin case holds the bobbin.

Bobbin-winding spindle

The bobbin-winding spindle rotates a bobbin to transfer thread from the main spool to the bobbin.

Drive belt

The drive belt spins the hand wheel and upper shaft as the motor runs to drive the sewing machine cams and gears.

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Drive motor

The drive motor rotates the drive belt, which spins the hand wheel and upper shaft to operate the sewing machine.

Feed dogs

Feed dogs push the fabric forward under the presser foot during stitching.

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Foot pedal

The foot pedal sends power to the motor and controls the speed of the motor.

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Hand wheel

Located on the right side of the sewing machine, the hand wheel adjusts the height of the needle when turned by hand.

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Lower thread tension adjustment screw

The lower thread tension adjustment screw sets the tension of the bobbin thread for correct bobbin thread feeding.

Needle

Mounted on the needle bar, the needle pushes needle thread down through the fabric and into the bobbin case. Bobbin thread loops the needle thread to form a locked stitch. The needle moves up above the fabric and repeats the process to form the next locked stitch.

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Needle plate

Positioned below the needle, the needle plate is the slotted flat surface that supports the fabric during stitching.

On/Off switch

The On/Off switch supplies power to the light and the motor control pedal.

Power cord

The power cord connects to the on/off switch and supplies electrical power to the sewing machine.

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Presser foot

The presser foot holds the fabric down against the feed dogs to move the fabric along as the needle stitches the fabric.

Reverse-stitch control

The reverse-stitch control reverses the feed-dog motion and allows the sewing machine to stitch backwards.

Shuttle drive gear

The shuttle drive gear rotates the bobbin and shuttle hook in synchronization with the needle to hook the upper needle thread and lower bobbin thread together to create the sewing stitches.

Shuttle hook

The shuttle hook catches the top needle thread and hooks the top needle thread and bottom bobbin thread together to create the sewing stitch in the fabric.

Shuttle race

The shuttle race holds the bobbin case under the needle plate.

Stitch length dial

The stitch length dial sets the speed of the feed dogs to form stitches of desired length.

Take-up lever

The take-up lever moves up and down to feed thread from the spool to the needle.

Thread guide

The thread guides hold the top thread as the top thread moves between the thread spool and the needle.

Thread spool pin

The thread spool pin holds the spool of thread at the top of the machine and allows the spool to rotate to feed thread down to the needle.

Upper thread tension dial

The upper thread tension dial sets the tension of the upper thread that feeds from the spool.