A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.

A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.

In a method and a device for laying busbars (5, 31, 33) in films, in which a bundle of heating wires (32) and at least two busbars (5, 31, 33), each electrically contacting at least one subset of the heating wires (32), are applied to at least one base film (3, 14-17, 21-24, 30), wherein the busbars (5, 31, 33) are each guided by a guide unit (35) in the direction of a pressure roller (1) and are pressed by the pressure roller (1) in the direction of the base film (3, 14-17, 21-24, 30) and are cut by a cutting device (8), it is proposed that the busbars (5, 31, 33) are each cut before the pressure roller (1) in the supply direction.

A heater of an embodiment includes a substrate, a resistance heating element, and a thermistor. The substrate includes a first surface and a second surface located on the side opposite to the first surface. The resistance heating element is disposed on the first surface. The thermistor is disposed on the second surface and does not contain lead.

Disclosed is a heat source for radiating heat onto an intermediate printing material transfer element of a printing apparatus. The heat source comprises a plurality of heat generating segments disposed along an axis, the plurality of heat generating segments including a first heat generating segment, a second heat generating segment and a third heat generating segment. The second heat generating segment is disposed between the first heat generating segment and the third heat generating segment. The second heat generating segment has a length shorter than a length of the first heat generating segment and shorter than a length of the third heat generating segment. Also disclosed is a printing system comprising the disclosed heat source. Also disclosed is a method of selecting a heat radiating pattern of a heat source.

A fixing apparatus includes a heating member, a supporting member that supports the heating member, a film slidably disposed on the heating member, and a pressing member that forms a nip portion, in collaboration with the film, through which the recording medium is conveyed. The fixing apparatus further includes a first thermally conductive member and a second thermally conductive member that are disposed between the heating member and the supporting member. The first thermally conductive member has a thermal conductivity higher than that of a substrate of the heating member. The thermal conductivity in in-plane directions of the second thermally conductive member is higher than the thermal conductivity in a thickness direction thereof. The second thermally conductive member is in contact with the heating member, and the first thermally conductive member is in contact with the second thermally conductive member.

A heater of an embodiment includes a substrate, a resistance heating element, and a thermistor. The substrate includes a first surface and a second surface located on the side opposite to the first surface. The resistance heating element is disposed on the first surface. The thermistor is disposed on the second surface and does not contain lead.

In an image heating device having a plurality of heating blocks which are controllable independently in a longitudinal direction of a heater, an increase of the size of the heater can be suppressed, and temperatures of a plurality of heating block can be detected.

A heater has a first temperature sensor corresponding to a first heating block, a second temperature sensor corresponding to a second heating block, a first electric conductor electrically coupled to the first temperature sensor, a second electric conductor electrically coupled to the second temperature sensor, and a common electric conductor electrically coupled to the first and second temperature sensors.

In an image heating device having a plurality of heating blocks which are controllable independently in a longitudinal direction of a heater, an increase of the size of the heater can be suppressed, and temperatures of a plurality of heating block can be detected. A heater has a first temperature sensor corresponding to a first heating block, a second temperature sensor corresponding to a second heating block, a first electric conductor electrically coupled to the first temperature sensor, a second electric conductor electrically coupled to the second temperature sensor, and a common electric conductor electrically coupled to the first and second temperature sensors.

A heating drum, which guides a long-sized medium and also heats and dries the medium, includes a cylinder-shaped main body part, disc-shaped limb parts attached to the end parts of the main body part, and a shaft core attached to the limb parts. On an edge of an inner circumferential surface of the main body part, a cut-out part extending in the circumferential direction is formed. A groove part also extending in the circumferential direction is formed on the inner circumferential surface on an inner side from the cut-out part of the main body part. The cut-out part and the groove part are in parallel with each other, and the limb part is fitted to the cut-out part. A claw part is fixed to the limb part by a fitting tool, so that a hook part of the claw part is freely movably fitted to the groove part.