An operating mechanism comprising: a shutter plate that is swingably supported by a swing shaft held by a mechanism body, covers both a first operating part and a second operating part placed in parallel to each other on the mechanism body; and a shutter mechanism that, in exposing the first operating part to operate the first operating part is adapted to swing the shutter plate in one direction and, in exposing the second operating part to operate the second operating part, swing the shutter plate in reverse direction, wherein the shutter mechanism comprises one pair of locking members for limiting or releasing the swing of the shutter plate, wherein the shutter mechanism comprises: first and second cams that move in conjunction with the shutter plate; and first and second limit switches that are opened and closed by the first and second cams, respectively, to control the protruding/retracting operation of one pair of plungers (12a, 12b) that can be protruded and retracted with respect to the shutter plate, wherein both the plungers (12a, 12b) normally limit the swing of the shutter plate to maintain the first operating part and the second operating part covered, and wherein, in operating the first operating part or the second operation part, in order to expose the operation part to be operated, when the shutter plate reaches a predetermined swing angle, the plunger for the operation part to be operated is retracted by the first cam and first limit switch or the second cam and second limit switch to release the limitation of the swing of the shutter plate, wherein the plunger (12a, 12b) is protruded/retracted by an interlock coil (11a, 11b) that is de-energized/energized by opening/closing the corresponding limit switch, characterized in that: when the first operating part or the second operation part is completely exposed, the interlock coil (11a, 11b) is de-energized by the first cam and first limit switch or the second cam and second limit switch. a shutter plate that is swingably supported by a swing shaft held by a mechanism body, covers both a first operating part and a second operating part placed in parallel to each other on the mechanism body; and a shutter mechanism that, in exposing the first operating part to operate the first operating part is adapted to swing the shutter plate in one direction and, in exposing the second operating part to operate the second operating part, swing the shutter plate in reverse direction, wherein the shutter mechanism comprises one pair of locking members for limiting or releasing the swing of the shutter plate, wherein the shutter mechanism comprises: first and second cams that move in conjunction with the shutter plate; and first and second limit switches that are opened and closed by the first and second cams, respectively, to control the protruding/retracting operation of one pair of plungers (12a, 12b) that can be protruded and retracted with respect to the shutter plate, wherein both the plungers (12a, 12b) normally limit the swing of the shutter plate to maintain the first operating part and the second operating part covered, and wherein, in operating the first operating part or the second operation part, in order to expose the operation part to be operated, when the shutter plate reaches a predetermined swing angle, the plunger for the operation part to be operated is retracted by the first cam and first limit switch or the second cam and second limit switch to release the limitation of the swing of the shutter plate, wherein the plunger (12a, 12b) is protruded/retracted by an interlock coil (11a, 11b) that is de-energized/energized by opening/closing the corresponding limit switch, characterized in that: when the first operating part or the second operation part is completely exposed, the interlock coil (11a, 11b) is de-energized by the first cam and first limit switch or the second cam and second limit switch. first and second cams that move in conjunction with the shutter plate; and first and second limit switches that are opened and closed by the first and second cams, respectively, to control the protruding/retracting operation of one pair of plungers (12a, 12b) that can be protruded and retracted with respect to the shutter plate, wherein both the plungers (12a, 12b) normally limit the swing of the shutter plate to maintain the first operating part and the second operating part covered, and wherein, in operating the first operating part or the second operation part, in order to expose the operation part to be operated, when the shutter plate reaches a predetermined swing angle, the plunger for the operation part to be operated is retracted by the first cam and first limit switch or the second cam and second limit switch to release the limitation of the swing of the shutter plate, wherein the plunger (12a, 12b) is protruded/retracted by an interlock coil (11a, 11b) that is de-energized/energized by opening/closing the corresponding limit switch, characterized in that: when the first operating part or the second operation part is completely exposed, the interlock coil (11a, 11b) is de-energized by the first cam and first limit switch or the second cam and second limit switch. when the first operating part or the second operation part is completely exposed, the interlock coil (11a, 11b) is de-energized by the first cam and first limit switch or the second cam and second limit switch.