Parts of a Sewing Machine

The basic purpose of a sewing machine is to stitch different materials together with a thread. That is probably all that concerns you anyway. But if you are curious about the wonders of a sewing machine that stitches up beautiful clothes, you will need to know the parts of the sewing machine which help in this work.

For details on this, check out the post “How to sew with a sewing machine and how it sews” 

You may use some of these names every day when sewing, like feet, foot pedal, etc. Some terms may be not-so-much ( I learned when I wrote this post), like the rotary hook and the stop motion screw.

The main parts of a sewing machine are

• Head,
• Arm,
• Handwheel,
• Needle bar,
• Spool pin,
• Bed,
• Presser feet,
• Presser foot bar and spring
• Presser foot lever or bar lifter,
• Thread cutter,
• Bobbin winder disc,
• Needle plate,
• Feed dog,
• Presser regulator,
• Thread take up lever,
• Thread guides,
• Needle,
• Bobbin case,
• Reverse sewing lever,
• Stitch length dial,
• Free arm,
• Stitch selector,
• Rotary hook,
• Bobbin winder,
• Stop motion screw,
• Needle clamp,
• Slide plate,
• Power switch and
• the Foot pedal.

All these parts of your sewing machine should work optimally in tandem for you to sew.  Just a little lint can clog them all up and stop the whole machine, so do not be hesitant in keeping all of these parts clean all the time (Cover your sewing machine pronto; dust is a killer to sewing machine parts).

Check out this post onTips for Sewing Machine Upkeep for taking care of your sewing machine properly ; And also make this sewing machine cover to keep it dust free and working in good stead.

Sewing machine parts

and their uses 

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1. Head

This refers to the complete sewing machine (without the stand) – the whole of the upper part that comprises the primary working components responsible for the machine’s sewing functions.

2. Arm of the sewing machine

This is the curved part of the sewing machine with the mechanism for driving the needle and handling the upper thread. Essentially, the arm is the bridge that connects the needle and needle bar with the main body of the sewing machine.

3. Hand Wheel

Hand wheel is at the right of the head. The balance wheel, when turned, helps in manually moving the needle for precise control.

It is used to manually move the needle up and down. Also called Balance wheel.

TIP : The hand wheel should always be turned towards you, even when using a reverse stitch.

4. Needle bar

The upright bar at the lower end of which the needle is attached.A needle clamp screw on this bar holds the needle in place.

5. Spool pin

The upright metal rod fitted on the top of the arm where your spool of thread sits while you sew.

6. Bed

Bed is the name for the flat portion of the head under which is the shuttle, feet and lower thread handling mechanism.

7. Sewing machine foot (Presser foot)

This is a detachable portion of the sewing machine which holds the fabric or material in place while sewing. It keeps the material flat and tight for proper sewing and lets you guide the needle smoothly through the fabric. Different types of presser feet are available with different functions – zipper feet, buttonhole, feet etc.

TIP : When you start to sew, pull some 4 inches of thread behind the presser foot. This tail is needed so that the machine does not ‘eat’ the thread.

It is the type of stitch you are going to make that determines the sewing machine foot you are going to use. 

The type of foot you buy also depends on whether your sewing machine is high shank or low shank or snap-on.

You have a low shank machine if the distance between the presser foot screw and the bottom of the feet is about 3/4 inch.

You have a high shank machine if the distance between the presser foot screw and the bottom of the feet is about 1 1/4 inch .

Snap-on feet just snaps itself to the lever. 

TIP : Keep the presser foot on down position for sewing. 

8. Presser foot lever

The presser foot lever is attached to the presser bar to control the up and down movement of the presser foot.

This lowers the presser foot into place when you are ready to sew, and to lift it up when you want to move your fabric. This has to be lifted to take out the material from the machine.

9. Thread cutter

Thread cutter is a sharp tool fastened to the side of the presser foot bar, to cut the thread as you sew.

10. Bobbin Winder Tension Disc (Tension angle)

Keeps your thread taut when you’re winding a bobbin. When winding the bobbin you have to pass the thread through this disc for proper winding.

11. Face plate ( Needle plate / Throat plate)

A semi-circular flat disc with a hole to allow the needle to pass through it. It is situated below the needle. It usually has a seam guide that can help you in guiding the fabric edges as you sew.

Tip : If you look at the seam guide as you sew instead of the needle you will be able to sew a straight line with even seam allowance. 

12. Feed Dog

Feed dogs are the teeth-like parts that move the fabric through the machine as you sew. Feed dog consists of metal strips with little teeth that stick up from the needle plate and move your fabric along as you sew.

When the machine is working the feed dog moves upwards and advances the fabric as each stitch is made. They move faster or slower depending on how hard you press the foot pedal.

For some sort of stitching, you may want to pull the feed dog down – there will usually be a lever/switch in your machine for this.

TIP : The feed dog will move your fabric automatically. You do not have to pull the fabric from the back – ofcourse, you know this. But once upon a time, I didn’t.

13. Presser Regulator (Tension regulator)

Presser regulator is a mechanism fixed to the face plate, which adjusts the amount of presser that the presser foot uses to hold your fabric down as you stitch. It controls the quality of stitches. The greater the pressure, the lighter the stitch.

14. Thread Take-up Lever

The thread take up lever which is fitted to the body of the arm, moves your thread up and down as you sew.

It feeds the thread to the needle. The thread goes through this lever when you thread your sewing machine.

This lever is always at the top when you start sewing and end the sewing.

15. Thread Guides

Thread guides are different points located in your sewing machine that keeps the sewing thread in place as you sew. If the order of guiding the thread to the needle is wrong the stitch will form tangled.

16. Needle

Sewing machine needles come in different sizes. Additionally, there are many varieties of sewing machine needles.

Twin needle is a very useful addition to your sewing accessory kit. 

Tip : Keep most of the fabric to the left of the needle so that you can look at the seam guide as you sew. 

• Change the needle after 8 -10 hours of use.
• Turn the machine switch off when changing the needle.
• When changing the needle the flat side of the needle should be facing away from you and the curved side of the needle should be facing you.

17. Bobbin case / Shuttle

Bobbin case and shuttle holds the bobbin thread inside the sewing machine.

Bobbin cases vary with different models of sewing machines in that some bobbin is inserted through the front, in some cases from the top (drop-in) . Some have a separate case; some machines come with inbuilt bobbin cases.

18. Reverse Sewing Lever/Button

This is the lever or button which allows you to sew backward when pressed.

19. Stitch Length and width Dials

Stitch length dial is a regulator with which you can change the length of your stitches. Graduation marks present in the lever indicates the length selection choices.

20. Accessory box

The accessory box is located around the free arm under the needle, attached to your sewing machine. It is a storage for your sewing accessories like feet, bobbins, etc., and serves an extended table for your fabric to rest when sewing.

21. Free arm

This mechanism allows you to sew tubular items like pant legs, sleeves, armholes, seams, etc. It has the stitch plate, feed dog, and bobbin case built into it and is revealed when you remove the accessory box.

22.Stitch Selector

Stitch selector allows you to choose different stitches available with your machine like the zig zag stitch, as well as the width of the stitches.

23.Rotary hook (Oscillating hook)

Rotary hook is that part of the sewing machine, that enters the loop or needle thread and carries it around the bobbin case to form the lock stitch.

24.Bobbin Winder

Bobbin winder is mechanism for winding thread on bobbin. It fills the thread evenly on the bobbin.

25. Stop motion screw

Stop motion screw is used while winding the bobbin with the bobbin winder, so that stitching is temporarily stopped when the screw is pressed.

It’s typically located in the center of the handwheel or on the side, or near the bobbin winder, depending on the machine’s design. It disengages the needle movement while allowing the bobbin to wind with thread.

26. Foot Pedal

This is the device you manage with your feet, used to apply power to the sewing machine and control the stitching speed. You should always maintain an even and steady speed throughout.

27. Needle Clamp & Screw

This is the portion of the sewing machine which connects the needle bar and needle. This is attached with the help of a screw.

27. Presser Bar

The presser foot is attached to this bar.

28. Presser Bar spring

Presser bar spring is a spring which controls the pressure asserted by the presser bar.

29.  Thread tension disc

Thread tension disc is a disc through which the upper thread is passed while threading the sewing machine so that the thread does not get knotted. Thread tension is critical for creating even stitches and is adjusted via this dial or a knob.

30. Light source

The built-in light near the head to illuminate the sewing area.

Different Sewing feet and their functions 

What I got from the sewing machine showroom ( the basic presser feet) is enough for me to sew just about anything with my sewing machine, but just like a girl can never have enough dresses, a sewing girl can never have enough fabric and sewing accessories.

You will be getting some very handy feet when you buy the sewing machine. But other special ones you may have to buy separately. There are some feet like the walking foot and blind hem foot which once you have them you wonder why you didn’t earlier.

The main types of sewing feet you should be having with your sewing machine are – Rolled hem foot, button hole foot, zipper foot, Straight stitch foot, Zig zag foot, walking foot, blind hem foot.

More details on Pressure feet are given in the post – Sewing Machine Pressure feet guide

Even the most grandiose-looking sewing machine works with these same parts. Different machines have these parts placed slightly differently from each other, that is all.

Look out for these sewing machine parts in your sewing machine and read the Sewing Machine manual you got for a more thorough understanding of your particular machine’s structure and workings. In fact, I recommend reading it at least twice, cover to cover, before starting to sew.

Related posts : How to repair a sewing machine at home. ; Common stitching problems in a sewing machine