US 5,265,534 AGranted

Screen roller printing frame improvements

OwnerKaino J. Hamuinventor

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Abstract

A silk screen printing frame having screen tensioning rollers which are rotatable to stretch a printing screen edgewise across the frame and are mounted on the frame by improved roller mounting assemblies that secure the rollers to roller mounting members at the roller ends. Each roller mounting assembly has an end block portion fixed within the adjacent roller end, a wrench engaging portion beyond the roller end by which the roller may be turned and which may be integral with or a separate part from the end block portion, a bolt extending axially through the end block and wrench engaging portions and the adjacent roller mounting member, and a lock nut threaded on the outer end of the bolt for releasably securing the roller against turning. A head on the inner end of the bolt engages the inner side of the end block portion to restrain the bolt against being pulled outwardly through the assembly when the lock nut is tightened to secure the roller against turning.

Claims37

Dependent claims

A printing screen stretch frame, comprising:

a rectangular frame structure having a central rectangular opening and including a pair of tubular screen tensioning rollers along two opposite sides, respectively, of the opening, a roller mounting member at each end of each roller having an inner side adjacent the respective roller and an opposite outer side, and roller mounting means mounting each end of each roller on the adjacent mounting member, and wherein
said frame is adapted to receive a printing screen across one side of the frame,
each roller has a central longitudinal rotation axis and means for gripping an edge the printing screen, and each roller is rotatable in one direction on its rotation axis to wind the screen on the roller,
each roller mounting means comprises an end block portion fixed within the adjacent roller end and having an inner side facing the opposite roller end, a wrench engaging portion disposed between the adjacent roller end and the adjacent mounting member and secured against rotation in said one direction relative to the respective roller, a bolt extending along the roller axis through said end block portion, said wrench engaging portion, and the adjacent mounting member and secured against rotation relative to said end block portion,
each bolt includes an inner shoulder engaging the inner side of its adjacent end block portion to prevent outward axial movement of the bolt relative to the end block portion and roller, and an outer threaded end extending beyond the outer side of the adjacent mounting member,
each roller mounting means further includes a lock nut threaded on said threaded end of said bolt at the outer side of the adjacent mounting member, and
said rollers are rotatable in said one direction by said wrench engaging portions to stretch the printing screen across the frame, and said lock nuts are rotatable on their bolts into and from engagement with the adjacent mounting members to secure said rollers against and release the rollers for rotation.

4 more elements

For use in a screen printing frame having a rectangular opening and pair of tubular screen tensioning rollers along at least two opposite sides, respectively, of the opening, and a roller mounting member at each end of each roller having an inner side adjacent the respective roller and an opposite outer side, roller mounting means for mounting each end of each roller on the adjacent mounting member, comprising:

a wrench engaging portion having a rotation axis,
an end block portion at one side of and coaxial with said wrench engaging portion and adapted to be fixed within one end of a roller,
a bolt extending along said axis through said end block portion and said wrench engaging portion and secured against rotation relative to said end block portion, and wherein
said end block portion has a normally inner side opposite said wrench engaging portion, and said wrench engaging portion has a normally outer side opposite said end block portion,
said bolt includes an inner shoulder engaging the inner side of said end block portion to prevent outward axial movement of the bolt relative to the end block portion, and an outer threaded end extending beyond the outer side of said wrench engaging portion, and
said roller mounting means further includes a lock nut threaded on said threaded end of said bolt.

3 more elements

Dependencies are inferred from the claim text.