Abstract: A sheet stacking device including: a stacking unit; and a regulation member movably supported by the stacking unit and contacting a sheet edge to regulate a sheet position. The regulation member includes: a locking member movable between an engagement position and a disengagement position; a biasing member biasing the locking member toward the engagement position; a force receiver receiving a user operation; a releaser converting a first force in a first direction applied to the force receiver into a second force in a second direction opposing a biasing force from the biasing member, moving the locking member from the engagement position to the disengagement position; and a stopper that, after the locking member disengages from the engaging portion and a user operation is not applied to the force receiver, prevents a movement of the locking member back to the engagement position due to the biasing force from the biasing member.

Abstract: A sheet stacking device including: a stacking unit; and a regulation member movably supported by the stacking unit and contacting a sheet edge to regulate a sheet position. The regulation member includes: a locking member movable between an engagement position and a disengagement position; a biasing member biasing the locking member toward the engagement position; a force receiver receiving a user operation; a releaser converting a first force in a first direction applied to the force receiver into a second force in a second direction opposing a biasing force from the biasing member, moving the locking member from the engagement position to the disengagement position; and a stopper that, after the locking member disengages from the engaging portion and a user operation is not applied to the force receiver, prevents a movement of the locking member back to the engagement position due to the biasing force from the biasing member.

Abstract: A connector portion of a hard disk device is provided with a recess portion that guides a connector portion of a holder device so as to align the connector portion of the holder device with the connector portion of the hard disk device. The connector portion of the holder device is provided with a guide projection that is guided by the recess portion. A connector body is attached to a holder body shiftable within a range that the connector portion of the holder device can follow the connector portion of the hard disk device and a range that the guide projection can be guided by the recess portion.

Abstract: A connector portion of a hard disk device is provided with a recess portion that guides a connector portion of a holder device so as to align the connector portion of the holder device with the connector portion of the hard disk device. The connector portion of the holder device is provided with a guide projection that is guided by the recess portion. A connector body is attached to a holder body shiftable within a range that the connector portion of the holder device can follow the connector portion of the hard disk device and a range that the guide projection can be guided by the recess portion.