Image forming apparatus that prompts exchange of a first rotatable member of a fixing portion based on a rotation time of the first rotatable member or a recording material length

1. An image forming apparatus comprising:

(A) an image forming portion configured to form a toner image on a recording material;

(B) a fixing portion including:

(a) a first rotatable member;

(b) a second rotatable member, the first rotatable member and the second rotatable member being configured to form a nip therebetween for fixing the toner image, formed by the image forming portion, to the recording material and

(c) a detecting portion configured to detect a temperature of the first rotatable member;

(C) an acquiring portion configured to acquire a rotation time of the first rotatable member; and

(D) a notifying portion configured to provide a notification prompting exchange of the first rotatable member on the basis of an accumulated value of the rotation time of the first rotatable member acquired by the acquiring portion, the rotation time being subjected to weighting on the basis of the temperature of the first rotatable member detected by the detecting portion.

2. The image forming apparatus according to claim 1 , wherein the detecting portion detects the temperature of the first rotatable member at a longitudinal central portion of the first rotatable member, and

wherein the notifying portion provides the notification prompting exchange of the first rotatable member on the basis of an accumulated value of the rotation time of the first rotatable member acquired by the acquiring portion, the rotation time being subjected to weighting on the basis of the temperature of the first rotatable member at the longitudinal central portion acquired by the detecting portion.

3. An image forming apparatus comprising:

(A) an image forming portion configured to form a toner image on a recording material;

(B) a fixing portion including:

(a) a first rotatable member;

(b) a second rotatable member, the first rotatable member and the second rotatable member being configured to form a nip therebetween for fixing the toner image, formed by the image forming portion, to the recording material; and

(c) a detecting portion configured to detect a temperature of the first rotatable member;

(C) an acquiring portion configured to acquire a length of the recording material to be passed through the fixing portion; and

(D) a notifying portion configured to provide a notification prompting exchange of the first rotatable member on the basis of an accumulated value of the length of the recording material acquired by the acquiring portion, the length of the recording material being subjected to weighting on the basis of the temperature of the first rotatable member detected by the detecting portion.

4. The image forming apparatus according to claim 3 , wherein the detecting portion detects the temperature of the first rotatable member at a longitudinal central portion of the first rotatable member, and at one longitudinal end portion of the first rotatable member, and

wherein the notifying portion provides the notification prompting exchange of the first rotatable member on the basis of the accumulated value of the length of the recording material acquired by the acquiring portion, the length of the recording material being subjected to weighting on the basis of a difference between the temperature of the first rotatable member at the longitudinal central portion and the temperature of the first rotatable member at the longitudinal end portion that are detected by the detecting portion.

5. The image forming apparatus according to claim 3 , further comprising (E) a second acquiring portion configured to acquire a basis weight of the recording material to be passed through the fixing portion,

wherein the notifying portion provides the notification prompting exchange of the first rotatable member on the basis of the accumulated value of the length of the recording material acquired by the acquiring portion, the length of the recording material being subjected to weighting on the basis of the temperature of the first rotatable member at the longitudinal central portion detected by the detecting portion, and the basis weight of the recording material acquired by the second acquiring portion.

6. An image forming apparatus comprising:

(A) an image forming portion configured to form a toner image on a recording material;

(B) a fixing portion including:

(a) a first rotatable member;

(b) a second rotatable member, the first rotatable member and the second rotatable member being configured to form a nip therebetween for fixing the toner image, formed by the image forming portion, to the recording material; and

(c) a detecting portion configured to detect a temperature of the first rotatable member;

(C) a first acquiring portion configured to acquire a rotation time of the first rotatable member;

(D) a first accumulating portion configured to accumulate the rotation time of the first rotatable member acquired by the first acquiring portion after the rotation time is weighted on the basis of the temperature of the first rotatable member detected by the detecting portion;

(E) a second acquiring portion configured to acquire a length of the recording material with respect to a feeding direction of the recording material;

(F) a second accumulating portion configured to accumulate the length of the recording material acquired by the second acquiring portion after the length of the recording material is weighted on the basis of the temperature of the first rotatable member detected by the detecting portion; and

(G) a notifying portion configured to provide a notification prompting exchange of the first rotatable member on the basis of outputs of the first accumulating portion and the second accumulating portion.