The SP20, a larger version of the SP15, was specifically designed to print repro proofs from metal type forms on specially formulated paper, which were then used to make photo-litho plates for offset printing. Unlike earlier Vandercook models, the impression cylinder is automatically in print mode when at the feed board, thus there is no movement of the eccentric during the forward carriage travel unless it is manually shifted into trip mode. The SP20 features the “quick change” rollers introduced with the Universal series. The gripper bar (simpler and lighter than earlier models) is the same style found on later Universals. Power ink distribution and automatic wash up unit was standard. Maximum form :19 × 26″; maximum sheet: 19½ × 28″. More than 140 SP20 presses are listed in the Vandercook census. See also SP15 and SP25.

Contributors

Paul Moxon, Core contributor