A thread trimmer is a mechanical device that is used to cut threads or yarns to a specific length. It is commonly used in the textile industry, as well as in other industries where threads or yarns need to be cut accurately and efficiently.

There are several types of thread trimmers, including rotary trimmers, guillotine trimmers, and shear trimmers. Rotary trimmers use a rotating blade to cut the thread, while guillotine trimmers use a sliding blade to make the cut. Shear trimmers use a pair of scissor-like blades to cut the thread.

Thread trimmers are typically used to cut threads or yarns that are used in sewing, knitting, or other textile applications. They are often used in conjunction with other textile processing equipment, such as winding machines, dyeing machines, and knitting machines.

Thread trimmers are designed to be accurate and efficient, and are often used to cut large quantities of thread or yarn in a short period of time. They are typically operated by trained technicians and are equipped with safety features to prevent accidents.