JP2016090830A5 - - Google Patents

Description

The present invention is to provide an image forming apparatus capable of accurately predict the lifetime of Fixing device.

To this end, the image forming apparatus of the present invention, a recording material on which the image is formed by the image forming unit, a fixing device for fixing by conveyed through the fixing nip portion is heated by the heating means, wherein From the temperature detection means for detecting the temperature of the fixing device, the number of recording materials having a predetermined width in the direction orthogonal to the conveyance direction of the recording material, and the detection result of the temperature detection means. sought, characterized in that it comprises a control means for determining the lifetime of the fixing device based on the temperature of the fixing device corresponding to the position of the end portion in the width direction of the recording material wherein a predetermined width .

According to the present invention , it is possible to accurately predict the life of the fixing device.

Claims (10)

The recording material on which the image is formed by the image forming unit, a fixing device for fixing by conveyed through the fixing nip portion is heated by the heating means,
Temperature detecting means for detecting the temperature of the fixing device;
A recording material having a predetermined width in a direction orthogonal to the conveying direction of the recording material is obtained from the number of sheets that pass through the fixing nip portion and the detection result of the temperature detection unit. Control means for determining the life of the fixing device based on the temperature of the fixing device corresponding to the position of the end in the width direction ;
An image forming apparatus comprising: When the detection position where the temperature detection means detects the temperature and the position of the fixing device corresponding to the position of the end portion are different,
The control means obtains the temperature of the fixing device corresponding to the position of the end portion from a temperature difference between the detection position and the position of the fixing device corresponding to the position of the end portion stored in advance. The image forming apparatus according to claim 1. When the detection position where the temperature detection means detects the temperature and the position of the fixing device corresponding to the position of the end portion are different and are separated by a predetermined distance,
The control unit obtains a temperature of the fixing device corresponding to the position of the end portion from a temperature difference between the detection position and a position stored at a predetermined distance from the detection position stored in advance. The image forming apparatus according to claim 1. When the detection position where the temperature detection means detects the temperature is the position of the fixing device corresponding to the position of the end, the temperature of the fixing device corresponding to the temperature detected by the temperature detection means corresponds to the position of the end. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. When there are a plurality of the predetermined widths of the recording material according to the size of the recording material, the control unit corresponds to the number of sheets passing through the fixing nip portion and the position of the end portion for each size of the recording material to be conveyed. The image forming apparatus according to claim 1, wherein a life of the fixing device is determined based on a temperature of the fixing device. The image forming apparatus according to claim 1, wherein the control unit issues a predetermined warning when it is determined that the fixing device is at the end of its life. When there are a plurality of the predetermined widths of the recording material according to the size of the recording material, the control unit determines the life of the fixing device for each size, and fixes the recording material of at least one size. 6. The image forming apparatus according to claim 1, wherein a predetermined warning is issued when it is determined that the apparatus is at the end of its life. When the control unit determines that the fixing device has a lifetime for a recording material of a predetermined size, the control means notifies that the recording material that does not pass through the position of the end in the width direction of the recording material of the predetermined size is used. The image forming apparatus according to claim 7. When the control unit determines that the fixing device has a life for a recording material of a predetermined size, the life of the fixing device when the recording material in which the short side and the long side of the recording material are exchanged is conveyed. The image forming and fixing is performed on the replaced recording material when the replaced recording material does not pass through the position of the end portion in the width direction of the recording material of the predetermined size determined to be 8. The image forming apparatus according to 7. 10. The control unit according to claim 1, wherein when the fixing device determines that the predetermined lifetime is reached, the control unit changes the temperature of the fixing nip portion heated by the heating unit to be low. The image forming apparatus according to claim 1.