JP2008163715A5 - - Google Patents

Claims (3)

  In a door opening / closing mechanism that opens and closes doors covering both sides with the middle of the opening of the device main body as a boundary, the door has a first locking position when the door is closed, and the door And a cam mechanism for pivotally supporting the door at the second locking position by sliding the door from the open side to the shaft side at the time of opening, and provided at one of the door and the device main body. A first rolling element capable of rolling, and a guide portion provided on the other side and guiding the door in a closing direction by its own weight by rolling in contact with the first rolling element. Opening and closing mechanism.   The cam mechanism guides the hinge pin that is a pivot shaft of the door when the door is opened, a guide pin disposed on either the door or the device body, and locks the hinge pin at both ends. The cam mechanism has a hinge groove that takes the first and second locking positions, a guide groove that guides the guide pin from the first locking position to the second locking position, and a circular arc that is coaxial with the hinge pin. The door opening and closing mechanism according to claim 1, further comprising: a rib disposed in a vertical direction; and a boss having a cylindrical surface that is in sliding contact with the rib at the second locking position.   The guide portion comprises a first inclined surface that descends when the door is closed by rolling in contact with the first rolling element, and the rotation axis of the first rolling element with respect to the longitudinal direction of the door in the closed state. The door opening / closing mechanism according to claim 1, wherein the contour line of the first inclined surface is inclined.