JPH03117256U

JPH03117256U -

Info

Publication number: JPH03117256U
Application number: JP2687890U
Authority: JP
Priority date: 1990-03-16
Filing date: 1990-03-16
Publication date: 1991-12-04

Description

[Brief explanation of drawings]

第１〜４図は本考案に係る定着装置の一実施例
を示す図であり、第１図はその概略横断面図、第
２図はその概略縦断面図、第３図はそのヒートロ
ーラの表面温度と時間とのグラフ、第４図ａはそ
のヒータの発光分布を示すグラフ、第４図ｂはそ
の作用を説明するための要部縦断面図。第５〜７
図は従来の定着装置を示す図であり、第５図はそ
の概略縦断面、第６図はそのヒートローラの表面
温度の変化を示すグラフ、第７図は他の状態のヒ
ートローラの表面温度の変化を示すグラフである
。２１……定着装置、２３……ヒートローラ、２
５……赤外線ヒータ（ヒータ）、２６……ケース
（保持手段）、２８……駆動ギヤ（駆動手段）、
３３……支持部材（移動手段）。 1 to 4 are diagrams showing an embodiment of the fixing device according to the present invention, in which FIG. 1 is a schematic cross-sectional view thereof, FIG. 2 is a schematic vertical cross-sectional view thereof, and FIG. 3 is a heat roller thereof. A graph of surface temperature versus time, FIG. 4a is a graph showing the light emission distribution of the heater, and FIG. 4b is a longitudinal cross-sectional view of the main part for explaining the effect. 5th to 7th
The figures show a conventional fixing device, with Fig. 5 being a schematic longitudinal section thereof, Fig. 6 being a graph showing changes in the surface temperature of the heat roller, and Fig. 7 being the surface temperature of the heat roller in other states. It is a graph showing changes in. 21... Fixing device, 23... Heat roller, 2
5... Infrared heater (heater), 26... Case (holding means), 28... Drive gear (driving means),
33...Supporting member (moving means).

Claims

[Claims for Utility Model Registration] (1) In a fixing device equipped with a heater arranged on the central axis of a hollow cylindrical heat roller and heating the heat roller, the fixing device is fixed to a holding member that holds the heat roller. Also provided is a moving means that supports an axial end of the heater and can move the heater in the axial direction, and determines the position _P1 of the heating center of the heater in the axial direction when the heater starts heating, and the heat roller. A fixing device characterized in that a position _P2 of the heating center when the fixing device reaches a predetermined temperature is shifted on an axis. (2) The moving means has a supporting member made of a shape memory alloy and supporting an axial end portion of the heater, and increases the temperature of the supporting member by heating the heater to deform and move the supporting member. The fixing device according to claim 1, characterized in that: (3) A driving means for driving the heat roller is provided at one end in the axial direction of the heat roller,
The moving means positions the position P ₁ closer to the driving means than the axial center of the heat roller when the heater starts heating, and positions the position P ₂ when the heat roller reaches a predetermined temperature. Claim 1, wherein the heater is moved so that the heater is positioned at the axial center of the heat roller.
Fixing device as described.