Printing screens and apparatus for tensioning printing...

B - Operations – Transporting – 41 – J

Patent

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B41J 2/005 (2006.01)

Patent

CA 2189803

A printing screen has a screen fabric extending across a frame comprising four rollers in a rectangular array, the rollers having longitudinal slots with securement strips engaged in the longitudinal slots and thereby securing edge portions of the screen fabric to the rollers. Corner members interconnect the four rollers and fasteners at the corner members are adjustable to releasably secure the rollers against rotation relative to the corner members. Connectors between the corner members and the rollers are freely rotatable relative to the corner members, on release of the fasteners, and fixed relative to the rollers. A screen fabric tensioning apparatus has a support structure shaped to support the printing screen and pneumatic cylinders mounted on the support structure and operatively connected to the connectors through a rack and pinion for rotating the rollers to tension the screen fabric.

Cadre d'impression avec tissu pour pochoir tendu en travers d'un cadre comportant quatre cylindres disposés en rectangle, les cylindres étant pourvus de fentes longitudinales avec bandes de fixation par pression servant à retenir les bords du tissu pour pochoir. Des éléments en coin assurent la liaison des quatre cylindres, et des dispositifs de fixation empêchent la rotation des cylindres par rapport aux éléments en coin. Des connecteurs placés entre les éléments en coin et les cylindres tournent librement par rapport aux éléments en coin lorsque les dispositifs de fixation sont désengagés, mais sont en liaison rigide avec les cylindres. Le dispositif de tensionnement du tissu pour pochoir, qui comporte une structure pour supporter le tissu et les cylindres pneumatiques, est en liaison mécanique avec les connecteurs par l'intermédiaire d'un mécanisme à pignon et crémaillère utilisé pour faire tourner les cylindres aux fins de tensionnement du tissu pour pochoir.

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