Canon Kabushiki Kaisha

Ryuta Ai

Takashi Ueno

Masahiro Makino

Yuichi Hatanaka

Takehiro Kishi

Yuusuke Torimaru

Toshinori Nakayama

Yasushi Takeuchi

Yoshikuni Ito

Fumiteru Gomi

An image forming apparatus includes a photosensitive member; a charging member configured to electrically charge the photosensitive member; a developing device configured to form a toner image by supplying toner to the photosensitive member; a transfer member configured to transfer the toner image from the photosensitive member onto a toner image receiving member; a cleaning member provided in contact with the photosensitive member and configured to remove the toner remaining on a surface of the photosensitive member after transfer; and a controller configured to carry out a process for notifying information on a lifetime of the charging member, on the basis of use amount information on a use amount of the charging member and contact pressure information on contact pressure applied by the cleaning member to the photosensitive member.

Image forming apparatus

An image forming apparatus includes an image bearing member, a toner image forming portion, a transfer member, a cleaning member, and a controller configured to carry out a process for notifying information on a lifetime of the image bearing member on the basis of information on contact pressure of the cleaning member to the image bearing member.

An image forming apparatus includes an image bearing member, a transfer member, a cleaning blade, an information storing member configured to store information on contact pressures of the cleaning blade to the image bearing member, an information input portion, and an executing portion configured to execute a toner supplying operation for supplying toner to the cleaning portion using a toner image formed on the image bearing member, in a period other than a period in which the toner image is formed on the image bearing member, for each predetermined number of image forming operations. On the basis of the information inputted to the input portion, the executing portion sets amounts of the toner supplied to the respective regions in the toner supplying operation.

Image forming apparatus with storage of cleaning blade contact pressure

An image forming apparatus includes an image bearing member, a transfer member, a cleaning member, and an executing portion configured to execute a supplying operation for forming a predetermined toner image on the image bearing member during non-image formation and then supplying toner of the predetermined toner image to the contact portion. The executing portion executes the supplying operation with a forming condition of the predetermined toner image preset on the basis of information preset on contact pressure applied by the cleaning member to the image bearing member.

An image forming apparatus includes: a rotatable image bearing member; an image forming portion; and a cleaning blade. The cleaning blade has an edge layer which includes an edge portion contacting the image bearing member and which is formed of a first resin material, and has a base layer which is provided superposedly on the edge layer so as to support the edge layer with respect to a thickness direction of the cleaning blade and which is formed of a second resin material different from the first resin material. The cleaning blade includes a hardened portion, at a part of the edge layer including the edge portion, subjected to hardening so as to be harder than another portion of the edge layer. The hardened portion has a length shorter than a length of the edge layer with respect to the thickness direction.

Image forming apparatus and cleaning blade

An image forming apparatus includes: an intermediary transfer member; an image forming unit; a transfer member; a cleaning member; and a setting portion for setting an absolute value of the first cleaning voltage applied to the cleaning member when a region of the intermediary transfer member, passed through the transfer portion where a higher transfer voltage is applied to the transfer member during passing of the recording material through the transfer portion, passes through the cleaning portion and for setting an absolute value of the second cleaning voltage applied to the cleaning member when a region of the intermediary transfer member, passed through the transfer portion where a lower transfer voltage is applied to the transfer member during passing of the recording material through the transfer portion, passes through the cleaning portion. The absolute value of the second cleaning voltage is higher than that of the first cleaning voltage.

An image forming apparatus includes: an intermediary transfer member (belt); first and second accommodating portions; a detecting member; an executing portion for executing a removing operation for removing the toner image transferred on the belt by once interrupting a continuous job for continuously forming an image on the recording material fed from the first accommodating portion when discrimination that there is no recording material in the first accommodating portion is made on the basis of a detection result of the detecting member during the continuous job and then for executing a switching operation for resuming the continuous job by feeding the recording material from the second accommodating portion; and a setting portion for setting a moving speed of the belt during execution of the removing operation so as to be higher than a moving speed of the belt when the toner image is transferred onto the recording material.

In an image forming apparatus, a control portion forms a restoring toner image (restoring toner band) at a position, in which the refreshing toner image overlaps with a control image with respect to a longitudinal direction of a secondary transfer roller, during post-rotation after image formation in an image forming job is completed. The restoring toner band is formed in a length corresponding to 3 full circumferences of the secondary transfer roller for one-sheet image forming job, 2 full circumferences of the secondary transfer roller for 5-sheet image forming job, and one full circumference of the secondary transfer roller for 10-sheet image forming job. In the case of an image forming job on 50 sheets or more, a lowering in cleaning performance of a secondary transfer member cleaning device for the secondary transfer roller is not caused to occur, so that the restoring toner band is not formed.

In an image forming apparatus, a control portion forms a restoring toner image (restoring toner band) at a position, in which the refreshing toner image overlaps with a control image with respect to a longitudinal direction of a secondary transfer roller, during post-rotation after image formation in an image forming job is completed. The restoring toner band is formed in a length corresponding to 3 full circumferences of the secondary transfer roller for one-sheet image forming job, 2 full circumferences of the secondary transfer roller for 5-sheet image forming job, and one full circumference of the secondary transfer roller for 10-sheet image forming is job. In the case of an image forming job on 50 sheets or more, a lowering in cleaning performance of a secondary transfer member cleaning device for the secondary transfer roller is not caused to occur, so that the restoring toner band is not formed.

Image forming apparatus featuring toner image band formation and adjusting image formation

In an image forming apparatus, when backside contamination of a recording material occurs, a control portion carries out control so that a plurality of restoring toner bands having a length Llonger than a circumference Lof a secondary transfer roller is formed at an interval Lat positions in which the restoring toner bands can overlap with control images with respect to a longitudinal direction of the secondary transfer roller and then is transferred onto the secondary transfer roller through an intermediary transfer belt. The restoring toner bands transferred onto the secondary transfer roller stagnate on a fur brush rubbing against the secondary transfer roller to remove an electric discharge product deposited on the secondary transfer roller. The toner stagnating on the fur brush is inverted in charge polarity and then is re-transferred onto the intermediary transfer belt through the secondary transfer roller. The toner stagnates on a belt cleaning device to remove the electric discharge product also from the intermediary transfer belt.

Image forming apparatus for preventing contamination of a backside of a recording medium

When a switch displayed on an operation panel is operated, a control portion starts aging control in which image formation is stopped and yellow toner is applied onto an intermediary transfer belt and a secondary transfer roller. A toner band is formed, on full circumference of the intermediary transfer belt at a position in which toner images for control are formed, with a width correspondingly to widths of the toner images for control.

Image forming apparatus with cleaning member

In an early-middle stage of a photosensitive drum life cycle, an image forming apparatus uses only a second semiconductor laser having an oscillation wavelength 660 nm to perform writing of an electrostatic latent image on a photosensitive drum surface. In a middle-late stage of the photosensitive drum life cycle, the image forming apparatus starts using a first semiconductor laser having an oscillation wavelength of 440 nm in addition to the second semiconductor laser to perform writing of an electrostatic latent image on the photosensitive drum surface with a combined exposure spot formed at the same position. An exposure control unit gradually increases an output rate of the first semiconductor laser according to an increase in total output of the first and second semiconductor lasers.

Image forming apparatus having a exposure control unit capable of changing an exposure ratio between a first exposure ratio and a second exposure ratio different from the first exposure ratio when a first exposure unit or second exposure unit exposes an image carrier on the basis of image data for forming an image with a certain density

An image forming apparatus including a plurality of container units containing sheets, a sheet feeding device provided for each of the plurality of container units and configured to feed the sheets; and a controller switching between modes including a first mode and a second mode in order to automatically switch a sheet feeding position from a container unit in current use to another container unit. In the first mode, the sheet feeding position is switched to the other container unit in the state in which a prescribed amount of sheets are left in the container unit in current use, and in the second mode, the sheet feeding position is switched to the other container unit after the sheets in the container unit in current use are exhausted.

Image forming apparatus and control method of the image forming apparatus

The image forming apparatus has an image bearing member, a detecting member, a toner image forming apparatus, a transfer member and a collecting member for collecting toner of a toner image for detection attached to the transfer member rotating while contacting with the transfer member, and removing member for removing the toner collected into said collecting member from the collecting member in a removing area. In the image forming apparatus, a portion of the collecting member contacts the transfer member passes through the removing area by a time when said collecting member next contacts with the transfer member, and by a time when a portion of the collecting member which contacts a portion of the transfer member contacts the toner image for detection next contacts the portion of the transfer member contacts with the toner image for detection, said collecting member passes through the removing area at least two times.

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Tokyo, Japan

Ryuta Ai