Purpose
A thread sensor – also called thread monitor or thread break detector – is a common feature of modern embroidery machines. It continuously monitors the upper thread and detects if it breaks, runs out, or becomes loose.
Once a problem is detected, the machine automatically stops to prevent incomplete or distorted stitching.
Variants and Applications
- Many machines have separate sensors for the upper and bobbin thread
- Especially useful for long designs or when working with delicate or metallic embroidery thread
- On multi-needle machines, each thread path is monitored individually
Benefits
- Prevents embroidery errors by stopping the machine in time
- Saves time by avoiding rehooping or redoing failed stitches
- Essential for commercial use and larger or complex designs
Usage Tips
- Regularly check that the sensor is working (e.g., by gently pulling the embroidery thread during operation)
- With ultra-fine or transparent threads, sensitivity adjustment may be necessary
- Not all entry-level machines include thread sensors – this is often a feature of mid- to high-end models