Copy frame for exposing off-set plates

摘要

The copy frame has a support surface (1) covered with a pliable mat (5) with rim (10). A transparent glass cover plate (2) is sealed fitted to rim (10) of mat (5). A vacuum is applied between mat (5) and plate (2). A registering system, has between two facing sides, inside the enclosing rim (10) two parallel rulers (3) with regular lines (12). Also a support (13) with a retainer knob (14) working in conjunction with registering lines (12) of rulers (3).