Abstract:
A method of attaching a guide ring to a roller according to the present invention is performed by using a jig which has a holding projection (20) on the upper surface of a supporting base (11), the method comprising: covering the outer periphery surface of said holding projection (20) with a guide ring (2) made of an elastic body; contracting said guide ring (2) in an inner periphery direction via a decompression hole opened on the outer periphery surface of said holding projection (20); applying an adhesive agent (3) to the outer periphery surface of the guide ring (2) while making the guide ring (2) adhere closely to the outer periphery surface of said holding projection (20); covering said guide ring (2) with said roller (1) from the tip opening in an axial direction, restoring the outer diameter of said guide ring (2) by releasing said decompression, pressing the adhesive agent (3) applied to the outer periphery surface of the guide ring (2) to the inner periphery surface of said roller (1); and removing said roller (1) from said jig after bonding and fixing said guide ring (2) onto the inner periphery surface.
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:
A heating roller (21), comprising a heating layer (22) heated by electromagnetic induction, an insulation layer (23), and a support layer (24) arranged from the outside to the inside of the heating roller in that order, the heating layer (22) further comprising at least two layers having a first heating layer formed of a magnetic material and a second heating layer formed of a nonmagnetic material, wherein the specific resistance of the first heating layer is higher than that of the second heating layer, and the wall thickness of the first heating layer is larger than that of the second heating layer, whereby the second heating layer is allowed to effectively act as a part heated by the electromagnetic induction, a heating efficiency can be increased more than that obtained when the heating layer (22) is formed of only one layer of the magnetic material to shorten a warm−up time and, since the heating layer (22) is concentrically heated, the support layer (24) is less heated to prevent bearings supporting the heating roller (21) from being damaged.
Abstract:
To provide an elastic member for image forming apparatus, which contains: a base; and an elastic layer provided on the base, wherein the elastic layer contains a polymer having a structure derived from terpene and a structure where a main chain contains a silicon atom.
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.