A multiple frame rate synchronous detecting apparatus for synchronous-detecting received serial data having one frame rate among a plurality of predetermined frame rates is provided. The current andor voltage generation may be process independent. The composite data is provided to the computing operation as the at least one input. Each nub is movable along an axis aligned with an elongated length of the pin. At this stage, predetermined tension is applied to the stencil sheet by an urging force of the swinging member to thereby prevent occurrence of wrinkles on the stencil sheet.