System for manufacturing springs

Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator

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72138, B21F 3500

Patent

active

049912771

ABSTRACT:
Springs manufactured to have a desired free length nonetheless exhibit a slight difference in free length from one spring to another. This results from a change in elasticity caused by a difference in wire material or a non-uniformity in wire cross section from one lot of wire to another or within one and the same lot. A plurality of pre-manufacturing operations, respectively, produce a given number of test springs is used to determine an optimum value of a control variable which is then used in a manufacturing operation. In a pre-manufacturing operation, the difference between the desired free length and the actual free length is determined, and the amount of this difference is multiplied by the control variable to produce a feedback signal. The feedback signal determined for one spring is used to adjust the thrusting motion of a pitch tool for corresponding by adjusting the free length of a subsequent spring. Each pre-manufacturing operation is performed with a different value of the control variable. The optimum value is determined from a distribution based on the actual free lengths associated with each value thereof.

REFERENCES:
patent: 3610006 (1971-10-01), Scheublein, Jr. et al.
patent: 3906766 (1975-09-01), Sato
patent: 4112721 (1978-09-01), Takase et al.
German Magazine Draht, 1984, No. 1, pp. 19, 20.
German Magazine Draht, 1982, No. 9, p. 582.
German Magazine Draht, 1982, No. 5, p. 301.
German Magazine Draht, 1980, No. 1, p. 44.

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