Alignment apparatus

Details Alignment apparatus Alignment apparatus

1984-06-21

1987-12-15

Harkcom, Gary V.

Boots, shoes, and leggings

356153, 356400, G06F 1546

Patent

active

047137843

ABSTRACT:
An alignment apparatus includes an illumination source for illuminating an object having a mark, a photoreceptor for receiving light reflected by the object, a converter for digitizing the output signal level of the photoreceptor, a circuit for determining a slice level on the basis of the data digitized by said converter, a device for comparing the digitized data and the slice level to extract a signal relating to the mark and determining the interval between the mark and a reference, and a device for causing relative movement between the object having the mark and the object having the reference mark to place them into alignment with each other.

REFERENCES:
patent: 4115762 (1978-09-01), Akiyama et al.
patent: 4259019 (1981-03-01), Johannsmeier et al.
patent: 4342090 (1982-07-01), Caccoma et al.
patent: 4393371 (1983-07-01), Morgan-Smith
patent: 4413186 (1983-11-01), Uema
patent: 4466073 (1984-08-01), Boyan et al.

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