Canon Kabushiki Kaisha

Ryuichi Yoshizawa

Atsuya Takahashi

Akihiro Nakamura

Kazuhisa Maruyama

Kaoru Sato

Masahide Kinoshita

Hironobu Isobe

Koichi Hiroshima

Tadashi Okanishi

Tatsuto Tachibana

Eiichiro Teshima

Naoki Kanno

Hiroki Hashii

An image forming apparatus includes image bearing members, an intermediate transfer member, a transfer unit, a control unit, and image forming units respectively corresponding to the image bearing members and each configured to form and transfer an image to the intermediate transfer member, which is then transferred to the conveyed recording material. Image patterns on the intermediate transfer member are detected for positional deviation detection. In a first mode, timing of image formation is determined using a first reference. In a second mode, timing of image formation is determined using a second reference. Based on timings at which formed image patterns are detected, the control unit, in the second mode, corrects timing of image formation performed by a second image forming unit or corrects timing at which the recording material is conveyed to the transfer unit.

Image forming apparatus to correct timing of image formation

An image forming system includes an option apparatus having a first conveying path; and an image forming apparatus having a second conveying path configured to be connected to the first conveying path. The image forming apparatus includes a sensor configured to detect a recording material conveyed on the second conveying path at a first speed; and a first controller configured to notify the option apparatus of a detection timing of the recording material. The option apparatus includes a second controller configured to determine whether the detection timing is different from a predetermined timing upon receiving a notification of the detection timing, and, if it is different, to determine a second speed based on the detection timing and the predetermined timing and change the conveying speed of the recording material from the first speed to the second speed.

Image forming apparatus having a conveying path, option apparatus and image forming system

A detection unit is disposed between a feeding unit and a secondary transfer unit on a conveyance path, and detects a transfer material that is conveyed. A control unit, if the detection unit cannot detect the transfer material by a predetermined timing after a feeding operation by a feeding unit, moves the secondary transfer unit away from a intermediate transfer member, causes the intermediate transfer member to continue rotating, and causes the feeding unit to retry feeding of the transfer material.

Image forming apparatus for retrying feed of transfer material

An image forming apparatus includes a paper cassette feeding a recording material, an image forming unit forming an image on a photosensitive member, a primary transfer roller transferring the image onto an intermediate transfer belt, a secondary transfer roller transferring the image onto the recording material, and a sensor detecting the size of the recording material. The timing of starting feeding the recording material is earlier than the timing of starting forming the image. When image formation on the recording material is started, until the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a first interval according to a predetermined recording material size, and after the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a second interval according to the detected recording material size.

Image forming apparatus

An image forming system including an image forming apparatus and a sheet feeding apparatus. The system includes: a first conveying unit conveying to the image forming apparatus a recording material; a second conveying unit conveying to an image forming unit of the image forming apparatus the recording material; a detector detecting a recording material type while the second conveying unit halts conveying the recording material; a first controller, based on detection by the detector, determining a speed for conveying the recording material to the image forming unit, and conveying the recording material at the conveying speed; and a second controller controlling recording material conveying speeds of the first conveying unit. Before the recording material reaches the second conveying unit, the second controller maintains a first conveying speed, and after the recording material reaches the second convey unit, maintains a second conveying speed determined by the first control unit.

Image forming system and control method therefor, and control unit for image forming apparatus

There is provided an image forming system that automatically discharges paper sheets other than poorly fed ones without making an emergency stop, even when poor paper feeding is caused due to a paper jam or the like. At paper feeding, information showing poor paper feeding is transmitted when the poor paper feeding is detected in supplying the paper sheets. At image forming, a determination is made whether the paper conveyance in forming the image is continued or stopped when an instruction, based on the information showing the poor paper feeding. At paper discharging, a determination is made whether the paper conveyance in discharging the paper sheets is continued or stopped when an instruction, based on the information showing the defective conveyance.

Image forming system and image forming method with operation continuation determination

An image forming apparatus includes a paper cassette feeding a recording material, an image forming unit forming an image on a photosensitive member, a primary transfer roller transferring the image onto an intermediate transfer belt, a secondary transfer roller transferring the image onto the recording material, and a sensor detecting the size of the recording material. The timing of starting feeding the recording material is later than the timing of starting forming the image. When image formation on the recording material is started, until the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a first interval according to a predetermined recording material size, and after the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a second interval according to the detected recording material size.

Image forming apparatus wherein a setting unit sets an interval of image formation according to a size of a recording medium

An image forming apparatus to which a paper handling unit is connected thereto is provided. The image forming apparatus detects the size of a sheet in a direction in which the sheet is conveyed for image formation. The image forming apparatus outputs sheet size mismatch information indicating that the size of the sheet does not match a predetermined size to the paper handling unit before a size detecting operation thereof has been completed detecting the trailing edge of the sheet is greater than the predetermined size.

Image forming system and image forming method

An engine control section detects that a sheet in a cassette is exhausted during duplex image formation. If a sheet with its first surface being printed is on standby in a duplexer, an image formation timing signal is output for a first surface of a sheet not fed because of a paper-out. Subsequently, an image formation timing signal is output for a second surface of the sheet that is in the duplexer and has its first surface printed. After completing the image formation of the second surface of the sheet, the operation is halted.

Image forming apparatus and its control method

At step S, since none of conveyance sensorsanddetect residual paper, a CPUnotifies a CPUthat it is in a residual paper check start instruction waiting mode. At step S, since a conveying path sensorin an optional paper feed unitdoes not detect residual paper, the CPUnotifies the CPUthat it is in a residual paper check start instruction waiting mode. At step S, since an inlet sensorof an optional paper output unitdoes not detect residual paper, the CPUnotifies the CPUthat it is in a residual paper check start instruction waiting mode. After confirming that all the units are in the waiting mode, the CPUissues a residual paper check start instruction to all the units simultaneously to improve usability by reducing initializing time.

Image forming system and method

In an image forming apparatus constructing a color table corresponding to a kind of recording material, provided is an image forming apparatus which includes an engine controlling unit for outputting a vertical synchronizing signal in consideration of a time required for a controller to construct the color table. The engine controlling unit and the controller are included. The engine controlling unit notifies the controller of an assumed kind of recording material and the kind of recording material actually detected. When the two are not identical, the controller reconstructs the color table corresponding to the detected kind of recording material. The engine controlling unit does not output, to the controller, the vertical synchronizing signal for outputting image data during the time when the controller constructs the color table.

Image forming apparatus and method for controlling the image forming apparatus

An image forming apparatus includes an output processing device determining an output process time in accordance with reservation information of a sheet of paper to be outputted, and a controller adjusting a paper transport interval in accordance with the output process time determined by the output processing device. Upon canceling the reservation information, the controller adjusts the paper transport interval of reservation information to be processed right after the canceled reservation information on the basis of an output process time of reservation information to be processed right before the canceled reservation information.

Image forming apparatus and output control method of the same

This invention relates to an image forming apparatus including an image forming unit which forms an image on a medium for each page, and a notification unit which, when image formation start instructions cannot be successively issued to the image forming unit for successive pages to be formed on media, notifies the image forming unit of the interval between the instructions. The image forming unit shifts to a stop state when the notified interval exceeds a predetermined time.

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Yokohama, Japan

Ryuichi Yoshizawa