The back tack lever, often found as a reverse stitch button or lever on contemporary models, is a crucial feature on a sewing machine used to secure the beginning and end of a seam, preventing stitches from unraveling.
Understanding the Back Tack Function
In essence, the back tack lever allows the sewing machine to sew backward for a short distance. This action is performed by:
- Sewing forward for a few stitches at the start or end of a seam.
- Activating the back tack lever/button to reverse the stitching direction.
- Sewing backward directly over the same stitches you just made.
- Releasing the lever/button to continue sewing forward (if at the beginning) or to finish the seam (if at the end).
This technique creates a small, reinforced area where the stitches overlap, effectively "locking" them into place.
Importance and Benefits of Back Tacking
Using the back tack function is a fundamental practice in sewing for several reasons:
- Seam Security: It significantly strengthens the seam, preventing the stitches from coming undone, especially in areas under stress.
- Durability: Garments and projects become more durable and long-lasting when seams are properly secured.
- Professional Finish: Back-tacked seams contribute to a neater and more professional appearance, as there are no loose threads to unravel.
- Reinforcement: Beyond just starting and ending seams, back-tacking can also be used to reinforce specific points that will experience high tension, such as pocket corners or strap attachments.
Back Tack Lever vs. Reverse Button
While older machines might feature a distinct "back tack lever," modern sewing machines universally incorporate a reverse button or lever to perform the exact same function. This ensures that all sewers, regardless of their machine's vintage, have access to this essential seam-locking capability. As of March 6, 2020, this functionality is a standard feature.
Practical Applications
Here are common scenarios where the back tack function is indispensable:
- Starting a Seam: Begin sewing, back tack a few stitches, then continue forward.
- Ending a Seam: Sew to the end, back tack a few stitches, then cut your threads.
- Stress Points: Reinforce areas that will bear weight or experience pulling, like the crotch of pants or the top of a bag handle.
- Mending: When repairing a tear or reinforcing a weak spot, back-tacking can help anchor new stitches securely.
For more information on sewing machine parts and their general functions, you can refer to resources like The Spruce Crafts' guide on sewing machine components.
