Electric heating – Metal heating – By arc
Patent
1989-07-24
1990-04-10
Albritton, C. L.
Electric heating
Metal heating
By arc
131281, B23K 2600
Patent
active
049162721
ABSTRACT:
A perforating apparatus comprises a pair of guide drums for guiding a web so that the web is wound so as to cover part of the mark members of the guide drums, respectively, each guide drum having a ring-shaped mask member, and a plurality of slits formed in the mask member, the mask members of the guide drums being situated in different axial positions with respect to the axial direction of the guide drums. The apparatus further comprises a laser beam generator, a two-segment mirror adapted to reflect the laser beam, emitted form the laser beam generator, in two split laser beams, two direction changing mirror for guiding the split laser beam into the guide drums so as to be coaxial therewith, multisegment reflection mirrors and adapted to reflect the split laser beam toward the web on the guide drums, and condensing lenses arranged between the mask members and the multisegment reflection mirrors and adapted to converge the subdivided laser beams, reflected by the multisegment reflection mirrors, on the web on the guide drums through the slits, the positions of the condensing lenses being deviated from one another in the axial direction of the guide drums.
REFERENCES:
patent: 4302654 (1981-11-01), Bennett et al.
patent: 4507535 (1985-03-01), Bennett et al.
patent: 4767909 (1988-08-01), Okumoto
Furukawa Takao
Okumoto Yutaka
Albritton C. L.
Japan Tobacco Inc.
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