Abstract:
An electromagnetic induced heating roller 21 comprises a core member 24, an elastic layer 23, induction heating layer 22, and a mold release layer in this order from inside to outside. Further, a magnetic shield layer for preventing a magnetic flux from penetrating into the core member 24 is interposed between the induction heating layer 22 and the core member 24. Out of an alternating magnetic field from a magnetic field generating means, a leakage flux having penetrated through the induction heating layer 22 is trapped by the magnetic shield layer. As a result, most of the impressed alternating magnetic flux is consumed for heating the heating layer 22, resulting in an improvement in the heating efficiency. A trouble is prevented which is generated by heating the bearing of the core member 24.
Abstract:
A fusing device is provided. The fusing device includes a heating roller having two end regions and an inner region between the two end regions, a coil module, and a controller. The coil module includes a first coil arranged along an axial direction of the heating roller; two second coils, one second coil arranged in each end region of the heating roller; and a third coil arranged in the inner region of the heating roller. The controller controls current directions of currents in the first coil, the second coils, and the third coil.
Abstract:
개시된 정착 장치는 자계를 발생시키는 자계 발생 장치와, 자계에 의하여 발열되는 정착 벨트와, 정착 벨트의 내측에 배치되는 제1, 제2 감온 자성 합금을 구비한다. 제1 감온 자성 합금의 제1 퀴리점과 제2 감온 자성 합금의 제2 퀴리점은 서로 다르다.
Abstract:
A heating roller (21) has a heating layer (22) for electromagnetic induction heating, a heat insulating layer (23), and a support layer (24) from inside to outside in this order. The support layer (24) consists of a material with a specific resistance of 1 x 10 −5 Ωm or more. Thus, despite of thinning down the heating layer (22) below the skin depth that is a thickness for an induction current to flow to make a magnetic flux penetrate through the heating layer (22) and reach the support layer (24), the support layer (24) is blocked from heating by an eddy current. Therefore, reductions in the heat capacity of the heating layer (22) and the heating of the support layer (24) are suppressed. The efficient heating of only the heating layer (22) enables a shortening in warm−up time and prevents a bearing or the like for supporting the heating roller (21) from being damaged by heat.
Abstract:
An electromagnetic induction exothermic roller (21) having, in the order from the surface, at least a release layer, induction exothermic layer (22), an elastic layer (23), and a core (24). Exothermic roller (21) is pressed by a press member (31) to form a nip portion (34) and heat up a heating subject material (11) passing through the nip portion (34). The induction exothermic layer (22) has a layer prepared by dispersing an electrically conductive filler in the base material consisting of a heat resistant resin or heat resistant rubber. For this reason, the induction exothermic layer (22) can easily deform, so that a nip portion (34) having a large width (W) can be formed. Further, the durability of the induction exothermic layer (22) against repeated bending is improved.
Abstract:
벨트타입 정착장치는 정착롤러; 상기 정착롤러와 마주하도록 설치되는 정착벨트; 상기 정착벨트의 내측에 설치되며, 상기 정착벨트가 상기 정착롤러와 접촉하여 정착 닙을 형성하도록 상기 정착벨트를 지지하는 닙형성부재; 상기 정착벨트의 양단을 지지하도록 설치되며, 상기 정착벨트에 의해 회전하는 한 쌍의 슬라이딩 부재; 상기 한 쌍의 슬라이딩 부재를 회전 가능하도록 지지하는 한 쌍의 플랜지 부재; 및 상기 정착벨트의 내부에 설치되며, 열을 발생하는 열원;을 포함하며, 상기 한 쌍의 슬라이딩 부재의 회전 중심이 상기 정착롤러의 회전 중심보다 인쇄매체 이송방향으로 상류 측에 위치한다.