Patent ID: 8430398
Filing Date: 2013-04-30
Classification: B65H,G03G

Abstract:
1. A sheet positioning device comprising: a platen on which to place a sheet of recording media; a first regulation member disposed on the platen and movable along the platen in a first direction perpendicular to a sheet conveyance direction in which the sheet is conveyed, the first regulation member being configured to contact one end of the sheet placed on the platen from the first direction to regulate the position of the one end of the sheet; a second regulation member to regulate the position of the other end of the sheet by contacting the other end of the sheet from a second direction opposite the first direction and perpendicular to the sheet conveyance direction, wherein, while the first regulation member regulates the position of the one end of the sheet, the second regulation member regulates the position of the other end of the sheet to position the sheet at a predetermined position on the platen in the first and second directions perpendicular to the sheet conveyance direction; a drive source; a drive transmitter to transmit a drive force generated by the drive source to at least the first regulation member to move the first regulation member in the first direction; and a sheet sensor unit comprising a plurality of sheet detection levers disposed along the conveyance perpendicular direction and reciprocally movable between a first position and a second position, a biasing member, and a connecting member that connects the plurality of sheet detection levers so that the entire sheet sensor unit moves as a single unit between the first position and the second position reciprocally, the sheet sensor unit detecting the sheet on the platen according to the position of the sheet detection levers moving from the first position to the second position while in contact with the sheet placed on the platen and in a state in which the plurality of sheet detection levers are being biased toward the first position by the biasing member.