Abstract: A key switch structure is provided with a key switch located in a position corresponding to a keyhole, a key top, and a key sheet disposed between the key switch and the key top. An embossed portion recessed inwardly relative to a case body is formed on the key sheet in a state where the key sheet is pressed down by a pressing protuberance of the key top not depressed, and tip corner parts of the pressing protuberance contact the formed embossed portion. Thus, the key top can be naturally positioned in the center position of the keyhole.

Abstract: A key switch structure is provided with a key switch located in a position corresponding to a keyhole, a key top, and a key sheet disposed between the key switch and the key top. An embossed portion recessed inwardly relative to a case body is formed on the key sheet in a state where the key sheet is pressed down by a pressing protuberance of the key top not depressed, and tip corner parts of the pressing protuberance contact the formed embossed portion. Thus, the key top can be naturally positioned in the center position of the keyhole.

Abstract: A distribution cable connector includes a cable and a plurality of distribution connectors that are connected to the cable and are used to connect the cable to a connection destination connector. Each of the distribution connectors includes a connection part configured to be fit into the connection destination connector and a fitting part with which a connection part of another distribution connector can be engaged. The distribution connector is configured to be connected to the connection destination connector via the connection part of the distribution connector and to be coupled to another distribution connector through engagement with a fitting part of the other distribution connector.

Abstract: A fan motor is mounted on the upper wall of the casing. The lower surface of this upper wall is formed into an inclined surface in which inclination is formed from the front wall side of the casing toward a back wall across from the front wall. When the fan motor is driven, oil mist or moisture contained in the air are condensed into water droplets or oil droplets. These water droplets or oil droplets fall and flow to the inner wall surface of the upper wall of the casing along the inner peripheral wall of a vent hole. Then the water droplets or oil droplets flow along the profile line of a vent hole smoothly (without stopping) and roll down the side wall of the casing.

Abstract: A fan motor is mounted on the upper wall of the casing. The lower surface of this upper wall is formed into an inclined surface in which inclination is formed from the front wall side of the casing toward a back wall across from the front wall. When the fan motor is driven, oil mist or moisture contained in the air are condensed into water droplets or oil droplets. These water droplets or oil droplets fall and flow to the inner wall surface of the upper wall of the casing along the inner peripheral wall of a vent hole. Then the water droplets or oil droplets flow along the profile line of a vent hole smoothly (without stopping) and roll down the side wall of the casing.

Abstract: A fan motor is mounted on the upper wall of the casing. The lower surface of this upper wall is formed into an inclined surface in which inclination is formed from the front wall side of the casing toward a back wall across from the front wall. When the fan motor is driven, oil mist or moisture contained in the air are condensed into water droplets or oil droplets. These water droplets or oil droplets fall and flow to the inner wall surface of the upper wall of the casing along the inner peripheral wall of a vent hole. Then the water droplets or oil droplets flow along the profile line of a vent hole smoothly (without stopping) and roll down the side wall of the casing.

Abstract: A fan motor is mounted on the upper wall of the casing. The lower surface of this upper wall is formed into an inclined surface in which inclination is formed from the front wall side of the casing toward a back wall across from the front wall. When the fan motor is driven, oil mist or moisture contained in the air are condensed into water droplets or oil droplets. These water droplets or oil droplets fall and flow to the inner wall surface of the upper wall of the casing along the inner peripheral wall of a vent hole. Then the water droplets or oil droplets flow along the profile line of a vent hole smoothly (without stopping) and roll down the side wall of the casing.

Abstract: A numerical control device comprises a box structure, a board unit housed inside the box structure, a wire distribution board disposed on the rear surface of the box structure, and a fan unit detachably mounted to the top surface of the box structure. The fan unit has a fan motor inside. A first connector wired from a power supply terminal is secured to the box structure while a second connector wired from a fan motor is secured to the fan unit at a position opposite the first connector secured to the box structure. Thus, the second connector can be connected to and removed from the first connector.

Abstract: A casing structure for a numerical control unit in which a cooling fan mounted on a fan cover is electrically connected with a control board attached to a main cover without using cables. A terminal unit connected with wiring of a fan motor is fixed to a fan cover, and a power supply terminal to be directly connected with the terminal unit is fixed to an upper end portion of a main control board The terminal unit is connected with or disconnected from the power supply terminal by attaching or detaching the fan cover to or from a casing body. Since cables are not needed for connection, a casing can be assembled and disassembled easily. Further, since an assembling error due to interference of cables is eliminated, automation of the assembling work can be easily achieved.

Abstract: A timing signal delay circuit comprises a counter placed with first delay setting data (21-24) for counting a first clock signal (12) in response to an input timing pulse (11), and a first flip-flop circuit which has a D-input supplied with the output of the counter (1) and a clock input supplied with a second clock signal of the same timing frequency as the first clock signal. For doubling resolution of the delay which the input timing pulse undergoes, there are provided an exclusive-OR gate (4) supplied with a second dealy data signal (31) and a third clock signal (14) of the same timing as the second clock signal (13), an AND gate (5) supplied with the output of the exclusive-OR gate (4) and that of the first flip-flop (3), and a second flip-flop supplied with the output of the AND gate (5) and a fourth clock signal (15) having twice as high frequency as that of the first clock (12). The input timing pulse can be delayed with high resolution or accuracy.