Patent ID: 7353680

Claim:
An universal compression spring former, comprising: an external diameter means being comprised of a linear cam with a linear variation relationship between height and angle thereof, said linear cam driving a convergence or expansion of an external diameter control block through a connecting rod, causing external diameter of a spring to have a linear change along with a change of angle of said linear cam, said linear cam being installed on an external diameter shaft, said external diameter shaft being connected to a servomotor; a spacing means causing change of space of said spring to have a linear relationship with a spacing shaft, a spacing rod being controlled by a spacing cam or screw, said spacing cam or screw being connected to a servomotor; a wire-feeding means driving a feeding of wire by a wheel set and having a control means to ensure length of wire feeding as a product of spring intermediate diameter, spring roll number and circumference ratio; a cutting means with a working mode for repeated cutting, a lowest point of said cutting means being set to zero degrees for cutting said spring, said spring being cut whenever a cutter of said cutting means swings from a positive angle to a negative angle or vice versa; a length-detecting means using a non-contact sensor to detect space between said spring and said sensor, a control means detecting actual height of said spring and comparing said spring with standard height spacing of a next spring being automatically modified, said control means providing a control signal for a sorting means according to the positive or negative allowance requirements; and a sorting means receiving springs produced and being comprised of a normal product chamber, a positive allowance chamber and a negative allowance chamber, an alternate change of inlets of the three chambers being controlled by an electromagnetic screw or pneumatic device electrically connected to said control means; wherein said control means is comprised of a microcomputer control means, controlling said external diameter means, spacing means, wire-feeding means, and speed and rotating angle of the servomotor of said cutting means, a screen of the microcomputer displaying input spring parameters, said spring parameters being transformed to drive commands of corresponding servomotors after processing by the microcomputer, using the feedback data of spring height from said length-detecting means, spacing of the next spring being modified.