Canon Kabushiki Kaisha

Takateru Okubo

Tomoo Akizuki

Masao Umezawa

Shuji Nishitani

Takuro Mita

Masanori Yamagata

The invention provides an image forming apparatus an image forming portion for forming an image on a sheet, a stack portion for stacking a sheet, a discharge portion for discharging the sheet, on which an image is formed by the image forming portion, to the stack portion, a sheet detection portion for detecting a conveying condition of the sheet on which an image is formed, a fully stacked condition detection portion for detecting whether the sheets stacked in the stack portion are in a fully stacked condition, and a determining portion for determining an abnormal condition of the sheet in the stack portion, based, after the detection of a sheet passing by the sheet detection portion, on a result of detection by the fully stacked condition detection portion as to whether the sheets stacked in the stack portion are in a fully stacked condition.

Image forming apparatus capable of preventing a sheet jamming during detected abnormal situations

The image forming apparatus having: a rotatable first image bearing member of bearing images; a rotatable second image bearing member of bearing images; and a transferring device for transferring images respectively born by the first image bearing member and the second image bearing member onto a recording material; wherein a first mode with the first image bearing member and the second image bearing member coming in contact with the transferring device so that images are formed respectively onto the first image bearing member and the second image bearing member and a second mode with the first image bearing member and the transferring device being set apart and the second image bearing member coming in contact with the transferring device so that an image is formed onto the second image bearing member are executable; and wherein, at the second mode, the first image bearing member starts rotation from a rotation stopped state and thereafter rotation stops. Thereby an image bearing member can be restrained from contacting recording material or transferring device to get deteriorated.

Image forming apparatus

The invention is to provide an image forming apparatus capable of suppressing a waving of a recording material. For this purpose, there is provided an image forming apparatus having: an image forming device for forming an image on a recording material; a fixing device for fixing the image formed on the recording material; and a recording material conveying device which is provided at a downstream side of the fixing device in a moving direction of the recording material, the conveying device including a first roller having a first shaft and a second roller having a second shaft and maintained in contact with the first roller; wherein the second roller includes a first portion provided in a vicinity of a passing reference of the recording material and maintained in contact with the first roller, and a second portion positioned farther from the reference than the first portion and having a diameter smaller than that of the first portion.

Image forming apparatus with fixing apparatus and conveying rollers downstream of the fixing apparatus. the conveying rollers having a portion with a releasing layer

The present invention provides an image heating apparatus that has a movable member, a guide member for guiding a movement of the movable member, and a back up member for forming a nip portion with the guide member via the movable member, wherein a recording material bearing an image at said nip portion is pinched and conveyed, the image on the recording material is heated by a heat from the movable member side, and wherein the guide member has a recess portion in a guide portion different from the nip portion.

Growing community of inventors

Susono, Japan

Takateru Okubo