Claims
- 1. For use in a printing screen frame assembly, the combination comprising:
- an elongate screen anchor having a bonding surface along one longitudinal side of the screen anchor to be bonded to a printing screen, and a roller having a circumferential surface and a longitudinal channel having an open longitudinal side opening laterally through said roller surface and removably receiving said screen anchor,
- said bonding surface being curved to approximately the same radius of curvature as said roller surface,
- said channel opening endwise through one end of said roller,
- said channel and screen anchor having generally complementary shapes in transverse cross-section which constitute said means for releasably securing said screen anchor in said channel, and the screen anchor being slidable in said channel endwise of the roller for insertion and removal through the open end of the channel,
- means for releasably retaining said screen anchor in said channel in a fixed position about and laterally of the axis of said channel wherein said screen anchor bonding surface is flush with the roller surface, and wherein
- said screen anchor is removable from said roller for cleaning and replacement.
- 2. A printing screen frame assembly comprising:
- an open rectangular screen frame having four corners, normally upper and lower sides, and a rectangular frame opening which opens through said frame sides, and said frame including four elongate frame members joined end-to-end at said corners and surrounding said opening,
- an elongate screen anchor extending lengthwise of each frame member and having a longitudinal side forming a planar screen bonding surface,
- means removably mounting each screen anchor on its respective frame member in a position wherein said bonding surface of the respective screen anchor is exposed at the lower side of said frame, and wherein
- said means removably mounting each screen anchor on its respective frame member comprises a channel extending longitudinally of the respective frame member and having an open longitudinal side at said lower side of said frame opening through an adjacent surface of said frame assembly, and said channel removably receiving the respective screen anchor with said longitudinal side of the respective screen anchor projecting laterally outwardly through said open longitudinal side of said channel and beyond said adjacent surface of said frame assembly to locate the entire bonding surface of the respective screen anchor beyond said adjacent surface,
- said means mounting each screen anchor on its respective frame member further comprises a drawbar extending lengthwise of the respective frame member and movable parallel to said common plane and laterally of the respective frame member toward and away from said frame opening,
- each drawbar has a drawbar surface which extends longitudinally of the respective drawbar and forms a said adjacent surface of the frame assembly, and each said channel extends longitudinally through a drawbar and opens laterally through said drawbar surface of the respective drawbar,
- said frame assembly includes means for moving each drawbar,
- said frame members have screen support surfaces at said lower side of said frame between said frame opening and said screen anchors and disposed in a common plane parallel to said frame sides, and
- said screen anchors are arranged on said frame to locate said bonding surfaces in positions in which the bonding surfaces are located between said common plane of said screen support surfaces and the upper side of said frame and face at an acute angle relative to said common plane.
- 3. A printing screen frame assembly comprising:
- an open rectangular screen frame having four corners, normally upper and lower sides, and a rectangular frame opening which opens through said frame sides, and said frame including four elongate frame members joined end-to-end at said corners and surrounding said opening,
- an elongate screen anchor extending lengthwise of each frame member and having a longitudinal side forming a planar screen bonding surface,
- means removably mounting each screen anchor on its respective frame member in a position wherein said bonding surface of the respective screen anchor is exposed at the lower side of said frame, and wherein
- said means removably mounting each screen anchor on its respective frame member comprises a channel extending longitudinally of the respective frame member and having an open longitudinal side at said lower side of said frame opening through an adjacent surface of said frame assembly, and said channel removably receiving the respective screen anchor with said longitudinal side of the respective screen anchor projecting laterally outwardly through said open longitudinal side of said channel and beyond said adjacent surface of said frame assembly to locate the entire bonding surface of the respective screen anchor beyond said adjacent surface,
- said means mounting each screen anchor on its respective frame member comprises a drawbar extending lengthwise of the respective frame member and movable parallel to said common plane and laterally of the respective frame member toward and away from said frame opening,
- each drawbar has a drawbar surface which extends longitudinally of the respective drawbar and forms a said adjacent surface of the frame assembly, and each said channel extends longitudinally through a drawbar and opens laterally through said drawbar surface of the respective drawbar,
- said screen support surface of each frame member is located between the respective drawbar and said frame opening,
- said frame assembly includes means for moving each drawbar,
- said frame members have screen support surfaces at said lower side of said frame between said frame opening and said screen anchors and disposed in a common plane parallel to said frame sides,
- said screen anchors are arranged on said frame to locate said bonding surfaces in positions in which the bonding surfaces are located between said common plane of said screen support surfaces and the upper side of said frame and face at an acute angle relative to said common plane,
- the drawbar surfaces of said drawbars comprise laterally outer beveled surfaces on the drawbars at said lower side of said frame disposed at said acute angle relative to said common plane of said screen support surfaces, and said drawbars have laterally inner surfaces at said lower side of said frame located between said beveled surfaces and said frame opening and in said common plane of said screen support surfaces, and
- said bonding surface of each screen anchor substantially parallels said beveled surface of the respective drawbar.
- 4. In combination:
- a printing screen,
- an open rectangular screen frame having four corners, normally upper and lower sides, and a rectangular frame opening which opens through said frame sides, and said frame including four elongate frame members joined end to end at said corners and surrounding said opening,
- an elongate screen anchor extending lengthwise of each frame member and having a longitudinal side forming a planar screen bonding surface,
- means removably mounting each screen anchor on its respective frame member in a position wherein said bonding surface of the respective screen anchor is exposed at the lower side of said frame, and wherein
- said means removably mounting each screen anchor on its respective frame member comprises a channel extending longitudinally of the respective frame member and having an open longitudinal side at said lower side of said frame opening through an adjacent surface of said frame assembly, and said channel removably receiving the respective screen anchor with said longitudinal side of the respective screen anchor projecting laterally outwardly through said open longitudinal side of said channel and beyond said adjacent surface of said frame assembly to locate the entire bonding surface of the respective screen anchor beyond said adjacent surface,
- said means mounting each screen anchor on its respective frame member comprises a drawbar extending lengthwise of the respective frame member and movable parallel to said common plane and laterally of the respective frame member toward and away from said frame opening,
- each drawbar has a drawbar surface which extends longitudinally of the respective drawbar and forms a said adjacent surface of the frame assembly, and each said channel extends longitudinally through a drawbar and opens laterally through said drawbar surface of the respective drawbar,
- said screen support surface of each frame member is located between the respective drawbar and said frame opening,
- said frame assembly includes means for moving each drawbar,
- said frame members have screen support surfaces at said lower side of said frame between said screen anchors and said frame opening and disposed in a common plane at said lower side of said frame,
- said screen anchors are arranged on said frame to locate said bonding surfaces in one of the following positions (a), (b) relative to said frame: (a) positions in which said bonding surfaces are located in said common plane of said screen support surfaces and face in the normally downward direction of said frame, (b) positions in which the bonding surfaces are located between said common plane of said screen support surfaces and the upper side of said frame and face at an acute angle relative to said common plane, and
- said printing screen is bonded to said screen anchor bonding surfaces and extends across the lower side of said frame in contact with said screen support surfaces between said frame opening and said screen anchors.
- 5. In combination:
- a printing screen,
- an open rectangular screen frame having four corners, normally upper and lower sides, and a rectangular frame opening which opens through said frame sides, and said frame including four elongate frame members joined end-to-end at said corners and surrounding said opening,
- an elongate screen anchor extending lengthwise of each frame member and having a longitudinal side forming a planar screen bonding surface,
- means removably mounting each screen anchor on its respective frame member in a position wherein said bonding surface of the respective screen anchor is exposed at the lower side of said frame, and wherein
- said means removably mounting each screen anchor on its respective frame member comprises a channel extending longitudinally of the respective frame member and having an open longitudinal side at said lower side of said frame opening through an adjacent surface of said frame assembly, and said channel removably receiving the respective screen anchor with said longitudinal side of the respective screen anchor projecting laterally outwardly through said open longitudinal side of said channel and beyond said adjacent surface of said frame assembly to locate the entire bonding surface of the respective screen anchor beyond said adjacent surface,
- said means mounting each screen anchor on its respective frame member comprises a drawbar extending lengthwise of the respective frame member and movable parallel to said common plane and laterally of the respective frame member toward and away from said frame opening,
- each drawbar has a drawbar surface which extends longitudinally of the respective drawbar and forms said adjacent surface of the frame assembly, and each said channel extends longitudinally through a drawbar and opens laterally through said drawbar surface of the respective drawbar,
- said screen support surface of each frame member is located between the respective drawbar and said frame opening,
- said frame assembly includes means for moving each drawbar,
- said frame members have screen support surfaces at said lower side of said frame between said screen anchors and said frame opening and disposed in a common plane at said lower side of said frame,
- said screen anchors are arranged on said frame to locate said bonding surfaces in one of the following positions (a), (b) relative to said frame: (a) positions in which said bonding surfaces are located in said common plane of said screen support surfaces and face in the normally downward direction of said frame, (b) positions in which the bonding surfaces are located between said common plane of said screen support surfaces and the upper side of said frame and face at an acute angle relative to said common plane, and
- said printing screen is bonded to said screen anchor bonding surfaces and extends across the lower side of said frame in contact with said screen support surfaces between said frame opening and said screen anchors,
- said adjacent surfaces of said drawbars comprise laterally outer beveled surfaces on the drawbars at said lower side of said frame disposed at said acute angle relative to said common plane of said screen support surfaces, and said drawbars have laterally inner surfaces at said lower side of said frame located between said beveled surfaces and said frame opening and disposed in said common plane of said screen support surfaces, and
- said bonding surface of each screen anchor substantially parallels said beveled surface of the respective drawbar.
- 6. A printing screen frame structure for mounting a printing screen, comprising:
- a rectangular frame assembly having normally upper and lower sides, a screen plane at the lower side of said frame assembly parallel to said sides, a central rectangular opening which opens through said upper and lower sides, means for securing and positioning a printing screen in said screen plane,
- said means for securing and positioning a printing screen comprising means including elongate frame anchors about and extending along the perimeter of said opening and having screen support surfaces including portions located in a common plane which constitutes said screen plane, elongate screen anchors extending along said frame anchors having longitudinal sides forming screen bonding surfaces, and means removably mounting said screen anchors within channels in and having open longitudinal sides opening through said screen support surfaces with their bonding surfaces located at the open sides of the channels, and
- said frame anchors comprising rollers rotatable connected end to end at the corners of said frame assembly to form a roller frame, and said screen support surfaces comprise circumferential surfaces of said rollers tangent to said common plane.
- 7. A screen frame structure according to claim 6 wherein:
- said screen anchor bonding surfaces are substantially flush with and curved to about the same radius as said roller circumferential surfaces.
- 8. A screen frame structure according to claim 6 wherein:
- said frame anchors comprise rollers rotatably connected end to end at the corners of said frame assembly to form a roller frame, and said screen support surfaces comprise circumferential surfaces of said rollers tangent to said common plane.
- 9. A screen frame structure according to claim 8 wherein:
- said screen anchor bonding surfaces are substantially flush with and curved to about the same radius as said roller circumferential surfaces.
- 10. A screen frame structure according to claim 6 wherein:
- said means removably mounting the screen anchor of each anchor pair on its respective frame anchor comprises a longitudinal channel in one anchor of the respective anchor pair and slidably receiving the other anchor of the respective anchor pair for endwise insertion and removal of the respective screen anchor from its frame anchor.
- 11. A screen frame structure according to claim 10 wherein:
- each channel and the anchor within the respective channel have complementary generally trapezoidal shapes in transverse cross-section.
- 12. In combination:
- a printing screen,
- a rectangular printing screen frame assembly having normally upper and lower sides, a central rectangular opening which opens through said upper and lower sides, and means securing and positioning said printing screen on said frame assembly in a printing position wherein a central portion of the screen extends across the lower side of said opening in a screen plane parallel to said upper and lower sides, and wherein said means securing and positioning said printing screen comprises:
- means including elongate frame anchors about and extending along the perimeter of said opening and having screen support surfaces including portions located in a common plane which constitutes said screen plane and engaging said screen about said opening, whereby said screen support surface portions position said central screen portion in said common plane, elongate screen anchors at the lower side of said frame assembly extending along said frame anchors and having longitudinal sides forming screen bonding surfaces, means bonding said bonding surfaces to said screen, and means removably mounting said screen anchors within channels in and having open longitudinal sides opening through said screen support surfaces with their bonding surfaces located at the open sides of the channels,
- said frame anchors comprising rollers rotatable connected end to end at the corners of said frame assembly to form a roller frame, and said screen support surfaces comprising circumferential surfaces of said rollers tangent to said common plane.
- 13. The combination of claim 12 wherein:
- said screen anchor bonding surfaces are substantially flush with and curved to approximately the same radius as said roller circumferential surfaces.
- 14. The combination of claim 12 wherein:
- said frame anchors comprise rollers rotatably connected end to end at the corners of said frame assembly to form a roller frame, and said screen support surfaces comprise circumferential surfaces of said rollers tangent to said common plane.
- 15. The combination of claim 14 wherein:
- said screen anchor bonding surfaces are substantially flush with and curved to approximately the same radius as said roller circumferential surfaces.
- 16. The combination of claim 12 wherein:
- said recesses comprise channels in said rollers, and said screen anchors have mating portions slidable endwise in said roller channels, respectively, for endwise insertion and removal of the screen anchors from their respective rollers.
- 17. The combination of claim 16 wherein:
- each channel and the anchor within the respective channel have complementary generally trapezoidal shapes in transverse cross-section.
- 18. The combination of claim 12 wherein:
- said screen anchors are constructed of a plastic material selected from the group consisting of ABS, acrylic, epoxy, nylon, thermoset polyester, thermoplastic polyester, polycarbonate, polyvinyl chloride, polyurethane, styrene-acrylonitrile, and
- said means bonding said screen to said bonding surfaces comprises an adhesive selected from the group consisting of acrylic adhesives, anaerobic adhesives.
- 19. A printing screen frame structure comprising:
- a rigid rectangular frame having normally upper and lower sides and a rectangular opening which opens through said sides, and including frame members along the perimeter of said opening rigidly joined end to end at the corners of the frame, and screen support surfaces on said frame members at the lower side of said frame located in a common plane parallel to said upper and lower sides,
- elongate drawbars extending along said frame members and having longitudinal sides at the lower side of said frame,
- means for moving said drawbars parallel to said plane laterally toward and away from said opening,
- elongate screen anchors extending along said drawbar surfaces and having screen bonding surfaces along longitudinal sides of said anchors, and
- means removably mounting said screen anchors on said drawbars along said drawbar sides with said bonding surfaces located in one of the following positions (a), (b) relative to said frame: (a) positions in which said screen support surfaces are located between said frame opening and said bonding surfaces and said bonding surfaces are located in said plane with said bonding surfaces exposed at the lower side of said frame; (b) positions in which said screen support surfaces are located between said frame opening and said bonding surfaces and said bonding surfaces are located between said plane and the upper side of said frame with said bonding surfaces disposed at angles relative to said plane and exposed at the lower side of said frame.
- 20. A printing screen frame structure according to claim 19 in combination with:
- a printing screen bonded to said bonding surfaces of said screen anchors and extending across the lower side of said frame with the screen in contact with said screen support surfaces between said opening and said screen anchors and extending across the lower side of said opening in said common plane.
- 21. A printing screen frame structure comprising:
- a rectangular roller frame having normally upper and lower sides and a rectangular opening which opens through said sides, and said frame including rollers along the perimeter of said opening rotatably joined end to end at the corners of the frame and having circumferential surfaces tangent to a common plane at the lower side of said frame parallel to said frame sides and containing longitudinal channels having open longitudinal sides opening through said roller surfaces and open ends opening through ends of the rollers,
- means for rotating said rollers,
- elongate screen anchors slidable endwise in said channels for endwise insertion and removal of the screen anchors into and from the channels and having screen bonding surfaces along longitudinal sides of said anchors located at the open sides of the channels, and
- a printing screen bonded to said bonding surfaces of said screen anchors and extending across the lower side of said frame with the screen in contact with said roller surfaces.
- 22. A printing screen frame structure according to claim 21 wherein:
- said screen anchors and said channels have generally trapezoidal shapes in transverse cross-section, and
- said screen anchor bonding surfaces are curved to substantially the same radius as said roller surfaces.
Parent Case Info
This is a divisional of application Ser. No. 07/944,223 filed on Sep. 14, 1992, now U.S. Pat. No. 5,379,691.
US Referenced Citations (12)
Foreign Referenced Citations (4)
Number |
Date |
Country |
1188301 |
Dec 1957 |
FRX |
620629 |
Mar 1949 |
GBX |
0620629 |
Mar 1949 |
GBX |
641996 |
Aug 1950 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
944223 |
Sep 1992 |
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