Abstract: A refrigeration cycle device that includes a main refrigerant circuit and a sub-refrigerant circuit cools or heats a main refrigerant that flows between a main heat-source-side heat exchanger and a main usage-side heat exchanger by causing a sub-usage-side heat exchanger to function as an evaporator or a radiator of a sub-refrigerant. A first main expansion mechanism and a second main expansion mechanism that decompress the main refrigerant are provided on an upstream side and a downstream side of the sub-usage-side heat exchanger of the main refrigerant circuit.

Abstract: A suction injection pipe and a subcooling heat exchanger are provided at a main refrigerant circuit in which a main refrigerant circulates. Further, a sub-refrigerant circuit that differs from the main refrigerant circuit and in which a sub-refrigerant circulates is provided. A controller performs control for switching between a cooling action of the subcooling heat-exchanger that cools the main refrigerant that is sent to a main use-side heat exchanger by using the suction injection pipe and the subcooling heat exchanger, and a cooling action of the sub-refrigerant-circuit that cools the main refrigerant that is sent to the main use-side heat exchanger by using the sub-refrigerant circuit.

Abstract: In a chain saw, the tension of a saw chain attached around the outer edge of a guiding bar can be adjusted appropriately by adjusting the force transmitted to a connecting unit during operation of a hand guard. Thus, the saw chain 6 can be easily strained at great tension without use of a strong coil spring.

Abstract: A chain saw an operator can easily strain a saw chain is provided. In the chain saw 1, the tension of a saw chain 6 attached around the outer edge of a guiding bar 4 can be adjusted appropriately by adjusting the force transmitted to a connecting unit 24 during operation of a hand guard 40. Thus, the saw chain 6 can be easily strained at great tension without use of a strong coil spring.

Abstract: In a printer, a carrier having a print head and an indicator mounted thereon is moved toward and away from the platen, so that the carrier is at one of a retracted position at which a distance between the print head and the platen is at a maximum, a contact position at which a switch member mounted on the indicator is in contact with a surface of a printing sheet, and a printing position at which the carrier is slightly retracted from the contact position to define a predetermined gap between the print head and the printing sheet. A switch member for detecting a printing sheet, i.e., a thickness of the sheet, is mounted on a flat portion of the indicator.