Machine for sequential manufacture of incandescent lamp filament

Details Machine for sequential manufacture of incandescent lamp filament Machine for sequential manufacture of incandescent lamp filament

1987-09-15

1989-01-24

Larson, Lowell A.

Wireworking

Article making or forming

Electric lamp or electric space discharge device electrode

B21F 304

Patent

active

047995181

ABSTRACT:
To make a series of spiral filament sections (6) joined by separating zone 5) extending essentially longitudinally of the core wire (4) which, after the filaments have been made and severed in the separating zones, is etched out of the spiral sections. To form the separating zones, a pincer system (7) having two jaws engage the core wire just after a filament section has been wrapped by a winding head (1) about the core wire. The pincer system has jaws which are sufficiently long, or have jaw elements (10,11) spaced from each other by a distance (d) corresponding to the length of the separating zone. Upon subsequent rotation of the winding head, a next spiral filament section (6) will be wrapped about the core wire, spaced from the preceding one by the spacing (d) of the jaw elements (10,11) or the length of the jaws (8). The pincer system travels longitudinally with the core wire upon formation of the spiral filament section. Opening and closing of the jaws is controlled in timed relation to operation of the winding head and wrapping of the filament sections.

REFERENCES:
patent: 2192260 (1940-03-01), Fisher
patent: 3322164 (1967-05-01), Lindsay
patent: 3605822 (1971-09-01), Noguchi et al.
patent: 4408639 (1983-10-01), Hayama et al.

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