Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Haskell, RS: AUTHOR [+4]
Disclosed is a clamshell that is designed for use with either glass master artwork or film artwork.
a clamshell that is designed for use with
either glass master artwork or film artwork.
The design is
such that artwork set-up is done prior to
installation in an expose machine. This allows for prealignment of
the artwork in each frame and reduces machine set-up time by enabling
quick frame changes.
clamshell contains two frames that holds an artwork image
either exposed directly onto the glass or as a film image mounted to
the glass (Fig. 1). Each glass panel (A) is mounted to the frame (B)
by means of metallic tabs (C) which have a threaded portion extending
away from the glass. The tabs are set in a precision locating
fixture and are cemented to the glass using UV curable adhesive.
Holes (D) are bored in the glass to permit the protrusion of product
alignment pins (E) that are precisely mounted to the frame and
protrude through the glass once it is mated to the frame. Alignment
of the artwork image to the frame registration pins is accomplished
through the use of an optical alignment machine. This machine
registers the frame on two fixed pins (F) and uses an X-Y-THETA axis
to position fiducials in the artwork image precisely in line with
precision bored bushings on the machine. Once the artwork is aligned
to the frame, the glass is secured by means of washers and nuts which
are placed over the threaded extensions on the metallic tabs and
Each artwork is now pre...