Method and apparatus for making screened lithographic and gravure plates

Claim 2

Means on said exposure lamp for receiving various light stops to vary the light image projected on and through the master screen and ultimately on the live film.

Claim 5

A master screen adjustably held in a generally vertically disposed plane on said supporting structure;

Claim 6

A master screen adjustably held in a generally vertically disposed plane on said supporting structure;

Claim 7

A live film positioned on said supporting structure in spaced-apart parallel relationship with said master screen; B. Track members having their ends carried by said supporting structure and said track members extending in a generally axial direction away from said master screen and in alignment with the master screen and the live film; C. An exposure lamp having means cooperatively engaging said track members whereby the lamp may be adjustably positioned toward or away from the master screen; and

Claim 8

A live film positioned on said supporting structure in spaced-apart parallel relationship with said master screen; B. Track members having their ends carried by said supporting structure and said track members extending in a generally axial direction away from said master screen and in alignment with the master screen and the live film; C. An exposure lamp having means cooperatively engaging said track members whereby the lamp may be adjustably positioned toward or away from the master screen; and

Claim 9

Said live film holder comprising an apertured surface and an enclosed chamber therebehind and, a. suction means associated with said chamber to hold said live film against the apertured surface; whereby either the first or second swingable rectangular doors may be optionally placed against the stationary rectangular frame so that the ground glass viewer and the live film are in identical planar positions in the supporting structure to permit proper setting of the equipment by viewing the ground glass.

Claim 10

Said live film holder comprising an apertured surface and an enclosed chamber therebehind and, a. suction means associated with said chamber to hold said live film against the apertured surface; whereby either the first or second swingable rectangular doors may be optionally placed against the stationary rectangular frame so that the ground glass viewer and the live film are in identical planar positions in the supporting structure to permit proper setting of the equipment by viewing the ground glass.

Claim 11

A live film positioned on said supporting structure in spaced-apart parallel relationship with said master screen; B. Track members having their ends carried by said supporting structure and said track members extending in a generally axial direction away from said master screen and in alignment with the master screen and the live film; C. An exposure lamp having means cooperatively engaging said track members whereby the lamp may be adjustably positioned toward or away from the master screen; and

Claim 12

A live film positioned on said supporting structure in spaced-apart parallel relationship with said master screen; B. Track members having their ends carried by said supporting structure and said track members extending in a generally axial direction away from said master screen and in alignment with the master screen and the live film; C. An exposure lamp having means cooperatively engaging said track members whereby the lamp may be adjustably positioned toward or away from the master screen; and

Claim 15

A first swingable rectangular door hinged at one vertical adjoining edge to the stationary rectangular frame; a. A ground glass viewer in said first swingable rectangular door,

Claim 16

A first swingable rectangular door hinged at one vertical adjoining edge to the stationary rectangular frame; a. A ground glass viewer in said first swingable rectangular door,

Claim 17

Said live film holder comprising an apertured surface and an enclosed chamber therebehind and, a. Suction means associated with said chamber to hold said live film against the apertured surface, whereby either the first or second swingable rectangular doors may be optionally placed against the stationary rectangular frame so that the ground glass viewer and the live film are in identical planar positions in the supporting structure to permit proper setting of the equipment by viewing the ground glass, B. Spaced-apart track members carried on said supporting structure and extending in a generally axial direction away from the master screen or the side opposite the ground glass viewer and the live film and in alignment with the master screen and the live film; C. An exposure lamp having means cooperatively engaging said spaced-apart track members and arranged and constructed so the exposure lamp may be adjustably positioned on said track members at varying spaced positions from the master screen, and

Claim 18

Said live film holder comprising an apertured surface and an enclosed chamber therebehind and, a. Suction means associated with said chamber to hold said live film against the apertured surface, whereby either the first or second swingable rectangular doors may be optionally placed against the stationary rectangular frame so that the ground glass viewer and the live film are in identical planar positions in the supporting structure to permit proper setting of the equipment by viewing the ground glass, B. Spaced-apart track members carried on said supporting structure and extending in a generally axial direction away from the master screen or the side opposite the ground glass viewer and the live film and in alignment with the master screen and the live film; C. An exposure lamp having means cooperatively engaging said spaced-apart track members and arranged and constructed so the exposure lamp may be adjustably positioned on said track members at varying spaced positions from the master screen, and

Claim 19

A first swingable rectangular door hinged at one vertical adjoining edge to the stationary rectangular frame; a. A ground glass viewer in said first swingable rectangular door,

Claim 20

A first swingable rectangular door hinged at one vertical adjoining edge to the stationary rectangular frame; a. A ground glass viewer in said first swingable rectangular door,

Claim 21

A second swingable rectangular door identical in size to the first swingable rectangular door and hinged at the other vertical adjoining edge of the stationary rectangular frame; a. A live film holder in said second swingable rectangular door,

Claim 22

A second swingable rectangular door identical in size to the first swingable rectangular door and hinged at the other vertical adjoining edge of the stationary rectangular frame; a. A live film holder in said second swingable rectangular door,

Claim 23

A second swingable rectangular door identical in size to the first swingable rectangular door and hinged at the other vertical adjoining edge of the stationary rectangular frame; a. A live film holder in said second swingable rectangular door,

Claim 24

A second swingable rectangular door identical in size to the first swingable rectangular door and hinged at the other vertical adjoining edge of the stationary rectangular frame; a. A live film holder in said second swingable rectangular door,

Claim 25

An apparatus as set forth in claim 2 in which the holder means (A-1-b) includes separate screw thread adjusting devices at each of the four corners of the stationary rectangular frame whereby the master screen may be accurately set in parallelism relative to the ground glass viewer of the live film.

Claim 26

An apparatus as set forth in claim 2 in which the holder means (A-1-b) includes a pluraLity of threaded bolts joining said master screen to said stationary rectangular frame, a sprocket on the end of each of said threaded bolts, chain means joining all of said sprockets and means driving said chain means to cause translational movement of said master screen relative to said stationary rectangular frame.

Claim 27

An apparatus as set forth in claim 4 in which said holder means (A-1-b) further includes separate screw thread adjusting devices at each of the four corners of the stationary rectangular frame separate from the threaded bolts whereby the master screen may be accurately set in parallelism relative to the ground glass viewer on the live film.

Claim 30

An apparatus as set forth in claim 6 in which the light stop (C-1) is very large whereby the exposure lamp and light stop may be used at a substantial distance from the master screen to obtain a more even exposure of the screen on the live film.