Patent ID: 8496243

Claim:
A sheet width regulating device, comprising: a base plate on which a sheet having one end and the other end parallel to each other is to be placed; a regulating member which regulates one end of the sheet; a first moving cursor which is a member for regulating the other end of the sheet, stands on an upper surface of the base plate and is movable in a way perpendicular to a direction along the other end of the sheet; a first rack that extends in the way on the upper surface of the base plate; a second rack that is spaced apart from and extends in parallel with the first rack; a first pinion that is attached to the first moving cursor and engaged with the first rack; a second pinion that is attached to the first moving cursor and engaged with the second rack; and a coupling shaft that rotates the first and second pinions simultaneously; wherein the first moving cursor further includes a locking portion for locking rotation of at least one of the first and second pinions about an axis of the pinion, and the locking portion includes: a locking member engaged with a peripheral surface of the at least one pinion from above; and a switching member for switching a position of the locking member between a position where the locking member is engaged with the at least one pinion and a position where the locking member is spaced apart from the at least one pinion.