Abstract A screen drum apparatus and method of constructing it wherein a pair of attaching strips are secured to the opposite long side marginal portions of a rectangular screen formed with a multitude of very small openings therein, and the screen is mounted on a drum framework comprising a pair of main structural frame members and at least one ring-shaped adjusting frame member. The attaching strips are respectively fastened to the periphery of the adjusting frame member and one of the main frame members so that the screen is circumferentially attached to the drum framework to produce a screen drum in which the attaching strips are interposed between the screen and the drum framework. When the screen is mounted on the drum framework in this way, the screen is spread taut circumferentially of the screen drum, and the spread of the screen across the width of the screen drum can be adjusted by moving the adjusting frame member toward or away from the main structural frame members.
A PHOTOSENSITIVE SCREEN DRUM FOR USE IN NONCONTACT ELECTROSTATIC PRINTING COMPRISING. A. TWO MAIN FRAME MEMBERS, B. SPACING MEANS RIGIDLY CONNECTING SAID MAIN FRAME MEMBERS IN SPACED FACE-TO-FACE RELATIONSHIP TO FORM A DRUM FRAMEWORK. C. A SCREEN HAVING A PHOTOCONDUCTIVE MATERIAL LAYER ON ONE SIDE THEREOF D. ATTACHING STRIPS SECURED TO EACH OF TWO OPPOSITE MARGINAL PORTIONS OF SAID SCREEN MEMBER AND HAVING A PLURITY OF ENGAGING MEANS THEREON, E.AT LEAST ONE CIRCULAR ADJUSTING FRAME MEMBER, F. MEANS SPACED ON THE OUTER PERIPHERIES OF SAID ADJUSTING FRAME MEMBER AND ONE OF SAID TWO MAIN FRAME MEMBERS AND COOPERATING WITH SAID ENGAGING MEANS FOR FASTENING SAID ATTACHING STRIPS RESPECTIVELY TO SAID ADJUSTING FRAME MEMBERS AND TO ONE OF SAID TWO MAIN FRAME MEMBERS. WHEREBY SAID SCREEN MAY BE TENSIONED CIRCUMFERENTIALLY AND G.MEANS FOR ADJUSTABLY CONNECTING SAID ADJUSTING FRAME MEMBER TO THE OTHER OF SAID TWO MAIN FRAME MEMBERS FOR AXIAL MOVEMENT WITH RESPECT TO THE DRUM FRAMEWORK WHEREBY SAID SCREEN MEMBER MAY BE ADJUSTABLY TENSIONED ACROSS THE WIDTH OF THE SCREEN DRUM.
Claim 2
Dependent Claim
171 words
A PHOTOSENSITIVE SCREEN DRUM FOR USE IN NONCONTACT ELECTROSTATIC PRINTING COMPRISING. A. TWO MAIN FRAME MEMBERS, B. SPACING MEANS RIGIDLY CONNECTING SAID MAIN FRAME MEMBERS IN SPACED FACE-TO-FACE RELATIONSHIP TO FORM A DRUM FRAMEWORK. C. A SCREEN HAVING A PHOTOCONDUCTIVE MATERIAL LAYER ON ONE SIDE THEREOF D. ATTACHING STRIPS SECURED TO EACH OF TWO OPPOSITE MARGINAL PORTIONS OF SAID SCREEN MEMBER AND HAVING A PLURITY OF ENGAGING MEANS THEREON, E.AT LEAST ONE CIRCULAR ADJUSTING FRAME MEMBER, F. MEANS SPACED ON THE OUTER PERIPHERIES OF SAID ADJUSTING FRAME MEMBER AND ONE OF SAID TWO MAIN FRAME MEMBERS AND COOPERATING WITH SAID ENGAGING MEANS FOR FASTENING SAID ATTACHING STRIPS RESPECTIVELY TO SAID ADJUSTING FRAME MEMBERS AND TO ONE OF SAID TWO MAIN FRAME MEMBERS. WHEREBY SAID SCREEN MAY BE TENSIONED CIRCUMFERENTIALLY AND G.MEANS FOR ADJUSTABLY CONNECTING SAID ADJUSTING FRAME MEMBER TO THE OTHER OF SAID TWO MAIN FRAME MEMBERS FOR AXIAL MOVEMENT WITH RESPECT TO THE DRUM FRAMEWORK WHEREBY SAID SCREEN MEMBER MAY BE ADJUSTABLY TENSIONED ACROSS THE WIDTH OF THE SCREEN DRUM.
Claim 3
Dependent Claim
23 words
A screen drum as in claim 1 in which said screen is provided on the other surface thereof with an insulating material layer.
Claim 4
Dependent Claim
36 words
A screen drum as in claim 1 wherein said engaging means comprises screw means and said cooperating means comprises receptacles for said screw means, so that in circumferential tension of said screen member may be adjusted.
Claim 5
Dependent Claim
21 words
A screen drum as in claim 3 wherein said screw means are positioned adjacent the opposite ends of said attaching strips.
Claim 6
Dependent Claim
29 words
A screen drum as in claim 1 further comprising bent portions on the outer edges of said attaching strips for engaging the outer end surfaces of said frame members.