A fixing unit includes a plurality of first engagement portions which respectively engage with a plurality of first to-be-engaged portions to restrict a movement of a heating unit in a third direction intersecting with a first direction and a second direction. A fixed unit includes a second engagement portion which engages with a second to-be-engaged portion to restrict a movement of the heating unit in the first direction. The fixing unit includes a movable unit, a supporting member, and a reciprocating mechanism. The supporting member supports the movable unit such that the movable unit is movable along the first direction. The reciprocating mechanism causes the movable unit to reciprocate. The reciprocating mechanism causes the movable unit to reciprocate once every time a plurality of sheets pass between a first rotation member and a second rotation member in the fixing unit.

An embossing device and a method for embossing, employing an electromagnetic induction device such as to induce an eddy current prevalently on the outer surface of an embossing roller. The eddy currents are such as to prevalently heat the outer surface of the embossing roller.

An induction heated roll apparatus includes a roller main body, an induction heating mechanism, and a cooling mechanism. The induction heating mechanism heats the roller main body, while the cooling mechanism cools the roller main body and/or the induction heating mechanism using a cavity portion between the roller main body and the induction heating mechanism. The cooling mechanism has intake apertures and discharge apertures that are formed in a journal flange portion and communicate with the cavity portion, a suction mechanism that suctions a gas in the cavity portion through the discharge apertures, and a mist supply mechanism that supplies mist to the intake apertures.

In order to supply sufficient electric power to an induction heating mechanism even with a small-diameter roller, an induction heated roll apparatus includes a roller body having a hollow cylindrical shape, a drive shaft provided at each of both ends of the roller body and rotatably supported, an induction heating mechanism that is provided inside the roller body and allows the roller body to inductively generate heat, and a support shaft that extends from both ends of the induction heating mechanism and supports the induction heating mechanism. The support shaft is rotatably supported on an inner peripheral surface at both ends of the roller body via a bearing.

The present invention is intended to adjust an amount of thermal expansion at a desired position in an axial direction of a roller body of an induction heated roll apparatus, regardless of an amount of load heat extracted from the roller body by a heating target object. The induction heated roll apparatus includes the roller body that is cylindrical and has a hollow space, a plurality of induction coils provided in an inside along the axial direction of the roller body, a power supply circuit that controls power supplied to each of the plurality of induction coils individually, and a cooling mechanism that cools the roller body by supplying a refrigerant to the roller body.

A heater for coating removal heating a metal member having a surface coated with a coating film, includes a high-frequency power source; a transformer transforming a high-frequency current outputted from the high-frequency power source; and a plurality of heating units, each heating unit being detachably connectable to the transformer to heat the metal member disposed in contact with or near the heater for coating removal by the high-frequency current outputted from the transformer. One heating unit is selected from the plurality of heating units and attached to the transformer. The inductance value of the plurality of heating units except for the selected heating unit is adjusted to be within a predetermined range relative to the inductance value of the selected heating unit.

A heater for coating removal heating a metal member having a surface coated with a coating film, includes a high-frequency power source; a transformer transforming a high-frequency current outputted from the high-frequency power source; and a plurality of heating units, each heating unit being detachably connectable to the transformer to heat the metal member disposed in contact with or near the heater for coating removal by the high-frequency current outputted from the transformer. One heating unit is selected from the plurality of heating units and attached to the transformer. The inductance value of the plurality of heating units except for the selected heating unit is adjusted to be within a predetermined range relative to the inductance value of the selected heating unit.

An induction heated roll apparatus includes a roller main body, an induction heating mechanism, and a cooling mechanism. The induction heating mechanism performs induction heating on the roller main body, and the cooling mechanism cools the roller main body and/or the induction heating mechanism using a cavity portion between the roller main body and the induction heating mechanism. The cooling mechanism has intake apertures that are formed in a journal flange portion on a first end side in an axial direction of the roller main body and communicate with the cavity portion, discharge apertures that are formed in a journal flange portion on a second end side in the axial direction of the roller main body and communicate with the cavity portion, a suction mechanism that suctions a gas in the cavity portion through the discharge apertures, and a mist supply mechanism that supplies mist to the intake apertures.

The present invention is one that intends to reduce the number of working processes necessary to provide a secondary conductor on the inner circumferential surface of a roll main body, and an induction heated roll apparatus including: a roll main body that is rotatably supported; and an induction heating mechanism that is provided inside the roll main body and has an induction coil for allowing the roll main body to inductively generate heat. In addition, on the inner circumferential surface of the roll main body, the secondary conductor is formed by build-up welding.

The present invention uniformly cools a roll body and/or an induction heating mechanism by gas without complicating the configuration around the roll body. An induction heated roll apparatus includes a roll body having a hollow part, an induction heating mechanism disposed in the hollow part to subject the roll body to induction heating, and a cooling mechanism to cool the roll body and/or the induction heating mechanism by generating a gas flow in a clearance between the roll body and the induction heating mechanism. The cooling mechanism includes a suction port disposed on one axial end side of the roll body that communicates with the clearance, an exhaust port disposed on an opposite axial end side of the roll body that communicates with the clearance, and a suction mechanism coupled to the exhaust port that sucks the gas in the clearance from the exhaust port.