Image registration board and compressible spacer assembly

Details Image registration board and compressible spacer assembly Image registration board and compressible spacer assembly

1992-07-20

1997-01-14

Will, Thomas B.

Geometrical instruments

Gauge

Collocating

G01D 2100

Patent

active

055927467

ABSTRACT:
A step and repeat apparatus including an image registration board and a compressible spacer. The image registration board preferably comprises a metal primary base layer such as aluminum, a filler layer such as an amorphous polyester including a Kodar.RTM. PETG copolyester film extrusion, two lower intermediate layers of polyester film such as Mylar.RTM., two upper intermediate layers of a low molecular weight melanin polymer such as Melanex-T.RTM., an intermediate spacing layer of a closed cell polyethylene or polyurethane foam, and a single top bed layer of an acrylic/PVC thermoplastic sheet such as Uniroyal.RTM.DKE400 extrusion grade vinyl, preferably having a top surface defining a level hair-line cell structure. The image registration board preferably defines a plurality of index holes uniformly positioned along and associated with the major divisions of a ruler or scale. The compressible spacer preferably comprises a longitudinal base plate which defines a hollow cylindrical well, a retaining collar received within the well, a retractable post received within the well and extending partially through the retaining collar, a coil-type compression spring to bias the retractable post upwardly away from the base plate, and one or two bottom pins depending from the base plate. The spacer may be mounted on the image board with the bottom pins being engagingly received within a selected pair of corresponding index holes, with the center of the retractable post of the spacer being offset a predetermined distance from each of the centers of the corresponding index holes.

REFERENCES:
patent: 2983049 (1961-05-01), Andrisani
patent: 3634009 (1972-01-01), Van Duncan
patent: 4188728 (1980-02-01), Denning
patent: 4332089 (1982-06-01), Denning
patent: 4636067 (1987-01-01), Richards
patent: 4855793 (1989-08-01), Carlson
patent: 4977683 (1990-12-01), Harder
patent: 4987686 (1991-01-01), Ternes
patent: 5042165 (1991-08-01), Ternes

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