Canon Kabushiki Kaisha

Isao Komatsu

Kunihiko Kitayama

Genta Sato

Koji Arimura

At the time of an end of an image forming job (YES of S), a controller causes a blade and a developing roller to be separated from a photosensitive drum (S). At that time, the controller controls separation timing of the belt and the developing roller so that the developing roller is separated from the photosensitive drum before a surface position of the photosensitive drum contacted to the developing roller at a contact position at the time of a start of separation of the blade from the photosensitive drum reaches a developing position with the separation of the blade. According to this, even when a liquid accumulation reaches the developing position depending on the separation of the blade, the developing roller has already been separated from the photosensitive drum before the liquid accumulation reaches the developing position and therefore, the liquid accumulation is not collected by the developing roller. When the liquid accumulation is not collected by the developing roller, color mixture due to the liquid accumulation does not occur.

Image forming apparatus

A cleaning blade for a photosensitive member carrying a liquid developer includes a free end surface provided at one end portion in a height direction of the blade, the free end surface being provided with an edge portion at one end portion of the free end surface with respect to the thickness direction. The edge portion has curved portions and a linear portion therebetween. As seen in the thickness direction, the curved portion includes an arcuate shape portion and is connected with the linear portion such that the linear portion is tangential of the arcuate shape; a height of the blade increases toward the end portion of the blade; a maximum angle formed between the curved portion and the linear portion is not less than 5 degrees; and the curved portion includes a portion having radius of curvature not less than 240 mm and not more than 320 mm.

Cleaning blade, cleaning device and image forming apparatus

An image forming apparatus includes an image forming portion configured to form an image on a sheet with a developer containing toner and an ultraviolet curable agent, a feeding belt configured to feed the sheet on which the image is formed by the image forming portion, and an ultraviolet irradiating portion configured to irradiate, with ultraviolet radiation, the image on the sheet that is being fed by the feeding belt. The feeding belt stops rotation thereof in a non-irradiated state of the feeding belt with ultraviolet radiation by the ultraviolet irradiating portion.

Image forming apparatus that controls rotation of a feeding belt and an irradiating state of an ultraviolet irradiating portion

A cleaning device includes a blade and a seal member including a first portion having first, second and third surfaces and including a second portion having a fourth surface. The first surface opposes a free end surface of the blade. The second surface is connected with the first surface. The third surface is connected with the first and second surfaces and is perpendicular to the free end surface. The fourth surface is parallel to the third surface and the free end surface. A first interior corner line is formed by the free end surface and the third surface so as to be substantially parallel to a thickness direction of the blade. A second interior corner line is formed by the third surface and the fourth surface so as to be connected with said first interior corner line and be substantially parallel to a height direction of the blade.

Cleaning device and image forming apparatus

An image forming apparatus includes a recording material feeding portion, an image forming portion, and a heating portion. An ultraviolet irradiating portion irradiates an image on a recording material with ultraviolet radiation, when the recording material is in an ultraviolet irradiation positon and is already heated by the heating portion, and a detecting portion detects a temperature of the recording material which has not yet been heated by the heating portion. In addition, a controller controls an output of the heating portion depending on the detected temperature so that the temperature of the recording material, when the recording material heated by the heating portion enters the ultraviolet irradiation position, is within a target temperature range that is set in advance.

A controller sets an AC voltage Vac, applies the voltage to a charging roller, and measures a DC component of a charging current flowing from the charging roller to a photosensitive drum. When it is determined that an absolute value of a measured value of the DC component in the charging current is lower than a prediction value, the controller sets an AC voltage Vac that differs from the AC voltage Vac set in step S, and applies the voltage to the charging roller. Thereby, a charging current capable of performing sufficient charging can be flown to the photosensitive drum, and the photosensitive drum can thereby be charged to a desired surface potential.

Image forming apparatus with controlled charging voltage

An image forming apparatus includes an image-bearing member bearing a toner image, a transfer unit transferring the toner image on the image-bearing member to a printing medium, a cleaning member rubbing against the image-bearing member and scraping away transfer residual toner from the image-bearing member, and a lubricant applying unit applying a lubricant to the image-bearing member. The apparatus further includes a driving unit driving the lubricant applying unit and a controller controlling the driving unit such that when a period required for an area corresponding to an interval between printing media to pass through a transfer position is longer than or equal to a predetermined set period during image formation, the amount of lubricant applied by the lubricant applying unit is at least lower than that in a case where the period required is shorter than the predetermined set period.

Image forming apparatus for applying a lubricant to an image-bearing member

A width of an untreated section in a drum blade is shorter than a width of an untreated section in an intermediate transfer member blade in an image forming apparatus using a blade, ends of which a treatment with high hardness is applied to, for both cleaning blades in a drum and an intermediate transfer member.

Image forming apparatus with a cleaning blade

An image forming apparatus, including: an image bearing member; a charging device configured to charge a surface of the image bearing member; a power source configured to apply a voltage to the charging device; an exposure device configured to irradiate the surface of the image bearing member with a light beam to form an electrostatic latent image; a developing device configured to develop the latent image into a toner image; and a reading device configured to read a color registration toner image obtained by developing, by the developing device, a color registration electrostatic latent image formed on the surface of the image bearing member by the exposure device within a period from a time when the power source is started up to apply the voltage to the charging device to a time when a potential of the surface of the image bearing member reaches a potential for usual image formation.

The present invention provides an image forming apparatus which includes a rotatable photosensitive member, a charging device which charges the photosensitive member, an applying unit which applies an alternating current voltage to the charging device, a processing portion which extracts a discharge current component by removing an alternating current component corresponding to the alternating current voltage from a current flowing between the photosensitive member and the charging device, and a control unit which controls a peak-to-peak value of the alternating current voltage based on the discharge current component extracted by the processing portion.

Image forming apparatus featuring a controlled AC voltage charging device for charging a photosensitive member

An image forming apparatus includes: a photosensitive member; a charging member configured to charge the photosensitive member at a photosensitive member charging position to form an electrostatic image on the photosensitive member; a developing device configured and positioned to develop the electrostatic image with toner to form a toner image; a transferring device configured to transfer the toner image to an image receiving member at a transfer position; a first brush, disposed at a position downstream of the transfer position and upstream of the photosensitive member charging position with respect to a rotational direction of the photosensitive member, configured to charge a residual toner on the photosensitive member at a toner charging position to collect the residual toner to the developing device and to be supplied with a charging bias having a polarity opposite to a regular charge polarity of the toner; and a second brush, disposed at a position downstream of the toner charging position and upstream of the photosensitive member charging position with respect to the rotational direction, configured to charge the residual toner on the photosensitive member and to be supplied with a charging bias having the same polarity as the regular charge polarity. The first brush has a fiber density smaller than that of the second brush.

Image forming apparatus featuring first and second brushes for charging residual toner

An image forming apparatus includes a rotatable brush in contact with an image bearing member at a position downstream of transfer means and upstream of charging means in a rotational direction of the image bearing member. The rotational brush is configured to supply electrical charge to residual toner that remains on the image bearing member. The image forming apparatus executes a mode for removing toner particles attached to the brush by setting a peripheral speed of the brush to be lower than that of the image bearing member during an image forming time period and setting the peripheral speed of the brush to be higher than that of the image bearing member during at least part of a non-image forming time period.

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Kashiwa, Japan

Isao Komatsu