Sheet guide positioning apparatus

摘要

An apparatus for positioning a pair of sheet guides for guiding a conveyed sheet therebetween. A pair of operation cylinders moves the pair of sheet guides toward and away from each other so as to contact the sheet. A pair of preset blocks is supported onto a screw rod including portions having mutually opposite threads thereon so that they are engaged with the corresponding opposite threads so as to move toward or away from each other along the screw rod according to the direction in which the screw rod is rotated by a motor. Each preset block includes a radial engagement protrusion. A positioning cylinder is provided to each sheet guide. The positioning cylinder includes an actuated piston which is engaged with the radial engagement protrusion at its protruded position to position the corresponding sheet guide at the desired position.