Patent ID: 8172222
Filing Date: 2012-05-08
Classification: B65H,G03G

Abstract:
1. A stacking mechanism comprising: a paper feed tray including a paper inlet through which a recording medium to undergo a recording process is to be supplied; a paper output tray on which the recording medium that has undergone the recording process and been transported is to be stacked, the paper output tray being superposed on the paper feed tray; a pivotal shaft that allows the paper output tray to pivot with respect to the paper feed tray so as to expose the paper inlet of the paper feed tray; a lock mechanism that locks the paper output tray displaced about the pivotal shaft, at a predetermined position; and a drawing mechanism that allows the paper output tray to be drawn out in a transport direction of the recording medium; wherein the lock mechanism locks the paper output tray drawn out, at the predetermined position angle, the paper output tray includes a projection provided on a downstream side of the pivotal shaft in the recording medium transport direction, the drawing mechanism includes a first guide groove that guides the pivotal shaft and a second guide groove that guides the projection; the first guide groove is provided between an initial shaft position where the pivotal shaft is located where the paper output tray is set in an initial position, and a distal shaft position, on the downstream side in the direction in which the recording medium is taken out, where the pivotal shaft is located when the paper output tray is drawn out; the second guide groove includes a first pivotal groove that pivotally guides the projection between a first initial projection position where the projection is located where the pivotal shaft is at the initial shaft position and a second initial projection position located above the first initial projection position, a second pivotal groove that pivotally guides the projection between the first distal projection position where the projection is located where the pivotal shaft is at the distal shaft position and a second distal projection position located above the first distal projection position, and a connection groove extending in the direction in which the recording medium is taken out so as to connect the first pivotal groove and the second pivotal groove, wherein the lock mechanism is provided in the second pivotal groove and the lock mechanism is located at a position corresponding to the second distal projection position, wherein the lock mechanism includes a leaf spring portion that appears in and disappears from a travel path for the projection to thereby lock the projection; and the leaf spring portion includes a convex portion that sticks out into the travel path, and that retracts from the travel path upon being contacted by the projection and returns to the sticking out position upon being released from the projection.