Fuji Xerox Co., Ltd.

Fuji Xerox Corporation

Nobuhiro Hiroe

Noribumi Sato

Tomoya Saeki

Yoshishige Sakamoto

Masahiro Sato

Takashi Hoshino

Keiji Sasaki

Kiichiro Iijima

Junji Hanatani

Takehiro Oishi

An image forming apparatus includes a supplying unit that supplies a continuous recording material, an image forming unit that forms an image on the recording material supplied from the supplying unit, a fixing unit that fixes the image formed on the recording material by the image forming unit, a collecting unit that collects the recording material having passed through the fixing unit, a detecting device that detects a change in tension of the recording material running between the image forming unit and the fixing unit, and a tension adjusting device that adjusts the tension acting on the recording material such that the change in the tension of the recording material falls within a permissible range if the change in the tension of the recording material that is detected by the detecting device exceeds the predetermined permissible range.

Image forming apparatus

A drive mechanism includes a first transmission mechanism that transmits a driving force of a drive unit to a first rotary member to rotate the first rotary member; a second transmission mechanism including a first drive path along which the second transmission mechanism transmits the driving force to a second rotary member through a first gear train to rotate the second rotary member, and a second drive path along which the second transmission mechanism transmits the driving force to the second rotary member through a second gear train to rotate the second rotary member, the second gear train having a gear ratio that differs from a gear ratio of the first gear train; and a switching mechanism that is operated by the driving force and switches the second transmission mechanism between the first drive path and the second drive path.

Drive mechanism and image forming apparatus

An image forming apparatus includes an image holding member on which an image is held, and a transfer unit transferring the held image to a recording material, wherein the transfer unit includes, a transfer roll disposed to be opposite to the image holding member, forming a transfer electric field, and transferring the image to the recording material, a drive unit applying driving force to the transfer roll, a torque limiting machanics limiting an upper limit of torque which acts on the transfer roll, and an inertia member provided to increase an amount of inertia with respect to the transfer roll and moving the transfer roll with inertia in a direction in which a speed difference between the image holding member and the transfer roll is decreased when the upper limit of torque acts on the transfer roll.

Image forming apparatus having torque limiting mechanics and inertia member

An image forming apparatus includes: a belt member stretched across at least two rollers; a protrusion disposed, such that it protrudes along the traveling direction of the belt member, on an inner surface of one edge side of the belt member; an engagement portion that is formed in an end portion of the rollers and with which the protrusion is engageable; and an image carrier that retains a toner image transferred to a recording medium conveyed by the belt member or the surface of the belt member. The end portion at the opposite side, in the width direction of the belt member, of one roller of the rollers is shifted in the direction where it separates from the image carrier and axially supported.

Image forming apparatus including shifted roller

An image forming apparatus including: a conveyance unit including a belt member stretched across at least a drive roller and a driven roller and conveys a recording medium and a casing that axially supports the drive roller and the driven roller; a body frame disposed with an image carrier for transferring an image to the recording medium; and a cover to which the conveyance unit is attached, is pivotably attached to the body frame, and opens/closes off the image carrier. A first regulating portion against which an annular member placed on a shaft portion of the drive roller abuts when the cover pivots toward the body frame to close off the image carrier and a second regulating portion with which an engagement portion formed in the casing in a direction orthogonal to the axial direction of the drive roller engages are formed on the body frame.

Image forming apparatus with conveyance unit regulating structure

An image forming apparatus includes a photoreceptor, a driving unit which rotation-drives the photoreceptor, an exposure unit which forms a latent image by performing image exposure to the photoreceptor, a plurality of development units which develop a plurality of latent images sequentially formed on the photoreceptor with different color toners respectively, a belt-like intermediate transfer member onto which respective color toner images sequentially developed on the photoreceptor are primarily transferred to be superimposed on each other, at least one load unit which comes in contact with or is separated from the belt-like intermediate transfer member to change a load on the belt-like intermediate transfer member, and a speed control unit which increases/decreases a driving speed of the photoreceptor at a specified timing. Preferably, the belt-like intermediate transfer member is an elastic belt.

Image forming apparatus using a belt-like intermediate transfer member

An image forming apparatus which includes an image carrier holding toner images of plural colors, and a transfer portion that transfers the toner images of plural of colors held on the image carrier onto a recording medium, wherein the image carrier is made of an elastic material, has a pattern image forming unit repeatedly forming a pattern image for color misregistration detection on the image carrier at a constant interval so as to set the pattern images within a length range of the recording medium, wherein one of the pattern images includes a first toner image group in which plural toner images of a first color is formed at a first interval, and a second toner image group in which plural toner images of a second color is formed at a second interval.

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Saitama, Japan

Nobuhiro Hiroe