Character grid for CRT phototypesetting machine

Claim 1

A character grid adapted to be mounted in a scanning position in a CRT phototypesetting machine having pin-like means for defining the scanning position and wherein the typographical symbols of the grid are selectively scanned to generate signals suitable for controlling the output of a CRT device to form images of scanned symbols on a sensitized sheet, said grid comprising a font element having an array of typographical symbols to be scanned, photographically imaged thereon and being formed of a flexible film member having locating apertures provided therein for co-acting with said pin-like means of the CRT phototypesetting machine to locate said font element in the scanning position, said font element having a plurality of apertures for receiving connecting elements which join said font element to a frame member, a frame member having a plurality of apertures aligned with the connecting element receiving apertures of said font element, and a plurality of connecting elements, one for each aligned aperture in said font element and said frame member, extending through said apertures for loosely connecting said font element to said frame member, each connecting element being a rivet like member having a diameter less than that of the aperture in said font element through which it extends and a length greater than the combined thickness of said font element and said frame member, whereby a loosely connected unitary structure is formed wherein said font element can move in a direction parallel to said frame member when being accurately located in said scanning position prior to being clamped in said position by said Frame member.