Method and apparatus of manufacturing a coil spring

Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part

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72135, B21F 302

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045948690

ABSTRACT:
A method of manufacturing a coil spring wherein, an amount of sway of a connecting body connected to a swaying body to be swayed by a cam or a crank driven by a driving shaft rotating at a constant speed in order to drive at least one or more means among those for changing a pitch of active coils, forming the end portion, changing the shape of cross-section of the active coils and cutting wire material is converted into a pulse signal and is then measured on the occasion of manufacturing a coil spring and a DC servo motor which drives and rotates a core bar or pressurized co-roller for supplying a wire material to the coil forming portion is driven by such pulse signal in order to form a total coils of a coil spring.

REFERENCES:
patent: 3906766 (1975-09-01), Sato
patent: 4018070 (1977-04-01), Yagusic et al.
patent: 4018071 (1977-04-01), Lampietti
patent: 4026135 (1977-05-01), Yagusic et al.
patent: 4030327 (1977-06-01), Collins et al.
patent: 4064732 (1977-12-01), Matsuoka
patent: 4112721 (1978-09-01), Takase et al.
patent: 4362038 (1982-12-01), Katahira et al.
patent: 4393678 (1983-07-01), Favot et al.
patent: 4503694 (1985-03-01), Takumi
Winding of Metal Evaporator Charge Coils, Anderson et al, Western Electric Digest No. 45, Jan. 1977, pp. 1,2.

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