JPH0481171U

JPH0481171U -

Info

Publication number: JPH0481171U
Application number: JP12502790U
Authority: JP
Priority date: 1990-11-27
Filing date: 1990-11-27
Publication date: 1992-07-15

Description

[Brief explanation of the drawing]

第１図はホームポジシヨンにある本考案による
定着装置の図、第２図は高い加圧状態にある該定
着装置の図、第３図は開動状態にある該定着装置
の図、第４図はステツピングモータのパルス数と
ローラ間ニツプ幅との関係を示すグラフ、第５図
および第６図はホームポジシヨンおよび開動状態
にある定着装置の別の実施例の図、第７図ないし
第９図は両ローラ間のニツプ幅変化の経過説明図
、第１０図は両ローラ間の加圧力と両ローラの関
係位置を示す角度θとの関係を示すグラフ、第１
１図は電源投入初期における時間と定着温度およ
び定着性の関係を示すグラフ、第１２図は両ロー
ラ間の加圧力を電源投入初期に変化させる例を示
すグラフである。２ａ……支点、２ｂ……支点、３ａ……上フレ
ーム、３ｂ……下フレーム、４ａ……上熱ローラ
、４ｂ……下熱ローラ、６ａ……上排紙搬送ロー
ラ、６ｂ……下排紙搬送ローラ、１７……枢着結
合点、２１……フイーラ、２２……ローラセンサ
。 FIG. 1 is a diagram of the fixing device according to the present invention in the home position, FIG. 2 is a diagram of the fixing device under high pressure, FIG. 3 is a diagram of the fixing device in the open position, and FIG. is a graph showing the relationship between the number of pulses of the stepping motor and the nip width between the rollers; FIGS. 5 and 6 are views of other embodiments of the fixing device in the home position and in the open state; FIGS. Figure 9 is an explanatory diagram of the change in nip width between both rollers, Figure 10 is a graph showing the relationship between the pressing force between both rollers and the angle θ indicating the relative position of both rollers.
FIG. 1 is a graph showing the relationship between time, fixing temperature, and fixing performance at the beginning of power-on, and FIG. 12 is a graph showing an example of changing the pressing force between both rollers at the beginning of power-on. 2a...Fully point, 2b...Fullin point, 3a...Upper frame, 3b...Lower frame, 4a...Upper heat roller, 4b...Lower heat roller, 6a...Upper discharge conveyance roller, 6b...Lower discharge Paper conveyance roller, 17... Pivotal connection point, 21... Feeler, 22... Roller sensor.

Claims

[Claims for Utility Model Registration] (1) In a fixing device for a copying machine having two rollers for fixing and conveying a toner image formed on a sheet, at least one roller and its surrounding members are used as a fulcrum. A fixing device characterized by being attached to a frame that can rotate around the circumference. (2) A driving means for rotating the frame to which the roller and its peripheral members are attached, a means for counting the time since power is turned on and/or the number of copies, and a roller nip width determined from the numerical value obtained from this counting means. The fixing device according to claim 1, further comprising control means for changing the fixing device.