Apparatus boring perforations in a web sheet

Details Apparatus boring perforations in a web sheet Apparatus boring perforations in a web sheet

1993-05-10

1995-04-04

Albritton, C. L.

Electric heating

Metal heating

By arc

21912174, 21912175, 21912177, B23K 2600

Patent

active

054039908

ABSTRACT:
A rotating polygon mirror deflects a continuous laser beam, applying the deflected beam to a beam-splitting mirror through a focusing lens 6 which functions as an f.theta. lens. The beam is applied to the two reflective surfaces of the mirror alternately. As a result, the mirror splits the beam into two beams, which are applied to two beam-splitting mirrors, respectively. The mirrors split the input beams, each into two segment beams. The four segment beams are focused by four lenses onto the surface of a web sheet, thereby forming beam spots. The beam spots move in the same direction and at the same speed as the web sheet, thus scanning limited surface regions of the sheet. As a result, rows of perforations, each being a truly circular hole, are formed in the web sheet.

REFERENCES:
patent: 4767909 (1988-08-01), Okumoto
patent: 4860773 (1989-08-01), Okumoto et al.
patent: 4916272 (1990-04-01), Okumoto
patent: 5210390 (1993-05-01), Okumoto

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