Catalyst for the asymmetric hydrogenation represented by the formula MLaXbSc, where M is a transition metal, to be chosen from rhodium and ruthenium, and X is a counter ion and S is a ligand, a ranges from 0. An image reader is optionally attached to the top surface of the frame, and a sheet can be pulled out of both a front side and another lateral side at which no frame is provided. Each receiver is angularly adjustable to vary the position of the backrest.