A compression spring coiler is a machine used to produce compression springs from metalic wire. There are both automatic and semiautomatic machines. Helical spring, cylindrical spring or conical spring can be produced by compression spring coiling machines.
The major units of a compression spring coiler include the drive, which is usually electric, the straightening and coiling units, and the pitch and cutting mechanisms. Cold coiling on automatic spring-coiling machines is most commonly found. These machines are characterized by discontinuous wire feed from two or three pairs of rollers driven by a gear sector or engaged by a friction clutch. The springs are cut off when the rollers stop. There are also spring coiling machines with continuous wire feed in which the springs are cut without stopping the rollers, which results in an increased output.
In addition to its basic mechanisms, a compression spring coiler may also have various attachments and monitoring and adjustment devices. Compression spring coilers are used mainly in series and mass production.