Abstract: A technique is provided that can further reduce power at the time of “unload operation control” in a gas compressor that generates a compressed gas at a set pressure by constant-speed control. The gas compressor includes a compressor main unit, a drive source, an intake throttle valve, a gas release valve, rotation speed converting means, a pressure detecting device that detects a discharge pressure, and a controller that, the relationship between an upper-limit pressure H and a lower-limit pressure L being H>L, carries out opening the intake throttle valve and closing the gas release valve and operating the drive source at a full-load rotation speed until the discharge pressure reaches the upper-limit pressure H. The controller carries out at least one of closing the intake throttle valve and opening the gas release valve to reduce the discharge pressure to within a predetermined range when the discharge pressure reaches the upper-limit pressure H.

Abstract: A screw compressor includes a screw rotor, a casing, and a delivery side shaft sealing unit. The delivery side shaft sealing unit includes an annular groove, a seal ring, and a shaft sealing fluid supply passage. Pressure of the fluid that is supplied to the one side, in the axial direction, of the seal ring via the shaft sealing fluid supply passage is set higher than pressure that acts on a first side surface, in an axial direction with respect to a first side wall surface of the annular groove, of the seal ring.

Abstract: Provided is a liquid supply mechanism including: a plurality of liquid supply sections each including a plurality of branch paths whose central axes intersect with each other, and a supply path having a side surface to which the plurality of branch paths of the plurality of liquid supply sections are directly connected, respectively, and supplying liquid, which is supplied from an upstream, to the branch paths.

Abstract: A position information antenna 22b receives a position signal including position information about a sending source (satellite, base station, or the like) of a positioning radio wave. A communication antenna 22a transmits position information about a compressor 100 (air compressor) that compresses the air and receives meteorological information corresponding to the position of the compressor 100 from a server on a cloud. A controller 13 specifies the position of the compressor 100 from the position signal received by the position information antenna 22b and controls the compressor 100 on the basis of the meteorological information corresponding to the position of the compressor 100 received by the communication antenna 22a.

Abstract: An electronic percussion instrument and sound production control method thereof are provided. In an electronic cymbal, the output of a musical sound is controlled in accordance with the results of detection from a strike sensor when the strike sensor detects a strike on a striking surface. While the musical sound is output, if a user touches the striking surface, an electrostatic capacitance sensor outputs an output value in accordance with the contact condition so that the musical sound is attenuated in accordance with the output value while being output. Therefore, the user can attenuate the musical sound being output in accordance with the contact conditions on the striking surface, thereby silencing the musical sound by way of the action similar to that of the acoustic cymbal choke that is the action of touching the striking surface.

Abstract: Provided is a liquid supply mechanism including: a plurality of liquid supply sections each including a plurality of branch paths whose central axes intersect with each other, and a supply path having a side surface to which the plurality of branch paths of the plurality of liquid supply sections are directly connected, respectively, and supplying liquid, which is supplied from an upstream, to the branch paths.

Abstract: A gas compressor includes: a compressor main body that compresses gas and discharges the compressed gas; an electric motor that supplies driving force; a power conversion device that supplies predetermined frequency power to the electric motor; at least one of a suction throttle valve disposed on the suction side of the compression main body and an air release valve that releases the compressed gas in a discharge piping system to an atmospheric pressure environment, and a controller. The gas compressor performs unload operation of reducing, when a discharge pressure reaches a predetermined pressure, a load on the compressor main body by closing the suction throttle valve or opening the air release valve. The gas compressor further includes a current value detector that detects a current value inputted to the power conversion device and outputs the current value to the controller.

Abstract: This electronic musical instrument main body device comprises an information acquisition unit and a port assignment unit. The information acquisition unit acquires, from a playing operation device connected to one connection terminal, information related to the playing operation device. The port assignment unit assigns, to the playing operation device, a virtual input port of a type corresponding to the information related to the playing operation device and acquired by the information acquisition unit.

Abstract: This electronic musical instrument main body device comprises an information acquisition unit and a port assignment unit. The information acquisition unit acquires, from a playing operation device connected to one connection terminal, information related to the playing operation device. The port assignment unit assigns, to the playing operation device, a virtual input port of a type corresponding to the information related to the playing operation device and acquired by the information acquisition unit.

Abstract: A screw compressor is provided which can reduce the pressure loss in a suction flow passage. A casing 12 of the screw compressor includes a bore 21 that accommodates a lobed portion 13A of a male rotor 11A and a lobed portion 13B of a female rotor 11B therein such that working chambers are formed in lobe grooves of the lobed portions, a suction port 22 located on an outer side in a rotor radial direction, and a suction flow passage 23 that communicates in a rotor axial direction with working chambers that are in a suction stroke. The suction flow passage 23 includes a male rotor side suction flow passage 26A located on an male rotor 11A side and besides on a downstream side with respect to a virtual plane C, and a female rotor side suction flow passage 26B located on an female rotor 11B side and besides on the downstream side with respect to the virtual plane C.

Abstract: A screw compressor includes a screw rotor, a casing, and a fluid supply portion to supply fluid in a membrane form into a compression chamber in the casing. The screw rotor has a male and female rotors. A male bore covering the male rotor and a female bore covering the female rotor are formed on the inner surface of the casing. An intersection line, on a higher pressure side, of the male and female bores is defined as a compression cusp. In a bore development view, a trajectory made by the first intersection of an extension line of a female lobe ridge and a male lobe ridge being moved, along with the rotation of the male and female rotors, is defined as a trajectory line. An opening of the fluid supply section to the compression chamber is positioned between the compression cusp and the trajectory line.

Abstract: This electronic musical instrument main body device comprises an information acquisition unit and a port assignment unit. The information acquisition unit acquires, from a playing operation device connected to one connection terminal, information related to the playing operation device. The port assignment unit assigns, to the playing operation device, a virtual input port of a type corresponding to the information related to the playing operation device and acquired by the information acquisition unit.

Abstract: The liquid level of a liquid supply type compressor including a gas-liquid separator is dynamically monitored. A liquid supply type gas compressor includes a compressor body of a liquid supply type; a gas-liquid separator that separates a liquid from a compressed gas, which is discharged, to store the liquid; a liquid piping system that supplies the liquid stored to the compressor body; an internal pipe that extends in an internal space of the gas-liquid separator, and includes at least two hole portions, of which disposition positions are different from each other in a height direction, on an internal space side to communicate with the liquid piping system; and a detector that detects a pressure or a temperature of a fluid flowing through the liquid piping system.

Abstract: A simpler notification is given about identifying causes of abnormalities and indicating dealing methods or countermeasures to deal with the causes of abnormalities.

Abstract: A screw compressor includes plural screw rotors, plural suction-side bearings that each rotatably support the suction side of the plural screw rotors and plural discharge-side bearings that each rotatably support the discharge side of the plural screw rotors, and a casing that houses the plural screw rotors, the plural suction-side bearings, and the plural discharge-side bearings. Each screw rotor includes a lobe section with plural lobes and a suction-side shaft section and a discharge-side shaft section each disposed at both ends of the lobe section. The casing has a housing chamber that houses the lobe sections of the plural screw rotors and a lubrication path in which liquid that lubricates the plural suction-side bearings circulates. In the lubrication path, respective passages to lubricate each of the plural suction-side bearings are connected in series and a most downstream part is connected to the housing chamber.

Abstract: An electronic percussion instrument and sound production control method thereof are provided. In an electronic cymbal, the output of a musical sound is controlled in accordance with the results of detection from a strike sensor when the strike sensor detects a strike on a striking surface. While the musical sound is output, if a user touches the striking surface, an electrostatic capacitance sensor outputs an output value in accordance with the contact condition so that the musical sound is attenuated in accordance with the output value while being output. Therefore, the user can attenuate the musical sound being output in accordance with the contact conditions on the striking surface, thereby silencing the musical sound by way of the action similar to that of the acoustic cymbal choke that is the action of touching the striking surface.

Abstract: Provided is a liquid supply mechanism including: a plurality of liquid supply sections each including a plurality of branch paths whose central axes intersect with each other, and a supply path having a side surface to which the plurality of branch paths of the plurality of liquid supply sections are directly connected, respectively, and supplying liquid, which is supplied from an upstream, to the branch paths.

Abstract: This electronic musical instrument main body device comprises an information acquisition unit and a port assignment unit. The information acquisition unit acquires, from a playing operation device connected to one connection terminal, information related to the playing operation device. The port assignment unit assigns, to the playing operation device, a virtual input port of a type corresponding to the information related to the playing operation device and acquired by the information acquisition unit.

Abstract: A technique is provided that can further reduce power at the time of “unload operation control” in a gas compressor that generates a compressed gas at a set pressure by constant-speed control. The gas compressor includes a compressor main unit, a drive source, an intake throttle valve, a gas release valve, rotation speed converting means, a pressure detecting device that detects a discharge pressure, and a controller that, the relationship between an upper-limit pressure H and a lower-limit pressure L being H>L, carries out opening the intake throttle valve and closing the gas release valve and operating the drive source at a full-load rotation speed until the discharge pressure reaches the upper-limit pressure H. The controller carries out at least one of closing the intake throttle valve and opening the gas release valve to reduce the discharge pressure to within a predetermined range when the discharge pressure reaches the upper-limit pressure H.

Abstract: A screw compressor includes a screw rotor, a casing, and a fluid supply portion to supply fluid in a membrane form into a compression chamber in the casing. The screw rotor has a male and female rotors. A male bore covering the male rotor and a female bore covering the female rotor are formed on the inner surface of the casing. An intersection line, on a higher pressure side, of the male and female bores is defined as a compression cusp. In a bore development view, a trajectory made by the first intersection of an extension line of a female lobe ridge and a male lobe ridge being moved, along with the rotation of the male and female rotors, is defined as a trajectory line. An opening of the fluid supply section to the compression chamber is positioned between the compression cusp and the trajectory line.