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What is the working principle of the CNC coil spring machine?

Update:16 Nov 2018
Summary:

The wire is pressed and rotated by one or several pairs […]

The wire is pressed and rotated by one or several pairs of rollers to push the wire forward, and the wire is formed by the limit and guiding action of the upper and lower ring bars. The steel wire continuously moves forward in the respective chutes of the upper and lower loop bars, and the size of the coil diameter can be controlled by controlling the positions of the upper and lower loop bars. The pitch bar is a vertical paper movement, which functions to form a threaded angle of the wound wire; by controlling and adjusting the position of the pitch bar, the spring pitch can be controlled. When the winding is completed, the steel wire is cut by a cutter; wherein the mandrel is used as a support for cutting the steel wire by the cutter
The spring machine can be wound by a combination of a wire feeding roller, an upper and a lower ring diameter rod, a pitch rod and a cutter to wind a cylindrical compression spring of various shapes such as a variable ring diameter and a variable pitch. For the mechanical coil spring machine, since there is only one power mechanism, each action rod is completely linked by a working mechanism such as a gear, a cam and a clutch, and the structure thereof is relatively complicated, and the adjustment is time consuming. Whenever a spring type is changed, it is often necessary to trim the cam shape. The technical level of the operator is relatively high, especially the adjustment range of the wire length depends on the size of a sector gear, which limits the free length of the spring. . When the unit gear returns, it is also necessary to disengage the wire feeding roller through the clutch, which not only increases the noise, but also reduces the wire feeding accuracy during the winding process.