Kyocera Document Solutions Inc.

Kyocera Corporation

Hiroki Kawasaki

Takashi Eiki

Ryohei Tokunaga

Yuta Kitabayashi

Shunsaku Fujii

Yuhiro Sakai

Atsushi Kohama

Rina Kikugawa

Akihiro Kondo

Tei To

Kotatsu Kawaguchi

Sadanori Nakae

Yuto Masaoka

Tomohiro Watatani

Hidenobu Nakagawa

Sara Fujikawa

Rina Kikukawa

In a fixing device, a heater heats an endless rotatable fixing belt. A retention member includes a groove for retaining a lubricant and retains the heater such that a surface on a front side comes into contact with an inner circumferential surface of the fixing belt via the lubricant. A pressure member is pressed against the heater while the fixing belt is interposed therebetween and forms, with the fixing belt, a pressure region for heating and pressurizing a paper sheet onto which a toner image has been transferred. A guide guides the paper sheet to the pressure region. The guide causes the paper sheet to come into contact with the fixing belt at a position more on a downstream side of a rotation direction of the fixing belt than the groove, to guide the paper sheet to the pressure region.

Fixing device for image forming apparatus with retention member having groove for retaining lubricant

A fixing device includes a fixing belt formed in a cylindrical shape, with a lubricant applied to an inner circumferential surface, and set such that a circumferential surface rotates in a circumferential direction, a heater retention member that retains the heater, inside of the fixing belt, and a pressure member that defines a nip region, through which a recording medium is transported in a nipped state, between the pressure member and a portion of the fixing belt heated from inside by the heater, and drives the fixing belt to rotate. The heater retention member includes a first opposing face extending in a rotation axis direction of the fixing belt, and opposed to the inner circumferential surface of the fixing belt. The first opposing face includes slits aligned in the rotation axis direction of the fixing belt, and a lubricant is applied in advance inside the slits.

Fixing device including heater retention member, having slits formed on face opposing inner circumferential surface of fixing belt, and image forming apparatus

A fixing device includes a first fixing member, a second fixing member, a pressing member, and a heating device. The first fixing member is in an ungrounded state and comes into contact with a toner image on a sheet. The second fixing member is arranged opposite the first fixing member. The pressing member presses the first fixing member against the second fixing member so as to form, at the contact portion between the first fixing member and the second fixing member, a nip portion through which the sheet passes. The heating device heats the first fixing member.

Fixing device and image forming apparatus provided therewith

A heater includes electrodes and heating element pieces. The electrodes energize the heating element pieces with electricity. The heating element pieces are connected to the electrodes and arranged through a gap portion in the heater in a main scanning direction. A ratio of a second surface area of the gap portion to a first surface area of the heating element pieces is 0&#x3c;(second surface area of the gap portion)/(first surface area of the heating element pieces)&#x2264;0.5.

Fixing device and image forming apparatus

A duration measuring section measures a plurality of times. A temperature measuring section measures a temperature of a heater at each of the times. A temperature information outputting section outputs heater temperature information. A temperature tendency computing section outputs temperature tendency information of the heater. A drive controller outputs linear velocity information for controlling the linear velocity of a pressure roller. A pressure roller drive section drives the pressure roller.

Image forming apparatus

A fixing belt heats and fixes a toner image. A pressure roller rotates the fixing belt while in contact with the fixing belt. A heater heats the fixing belt. A lubricating oil forms an oil film between the heater and an inner peripheral surface of the fixing belt. A pressure roller driver rotates the pressure roller so that the lubricating oil causes the fixing belt to be out of contact with the heater.

The fixing device includes a cylindrical heated member and a heating part. The cylindrical heated member is long in a width direction of a sheet, and is supported in a rotatable manner with coming into contact with a fixing face of the sheet. The heating part is provided in an inner space of the heated member and heating an inner circumferential face of the heated member. The heating part includes a plurality of heaters disposed side by side in a longitudinal direction of the heated member; and a first temperature sensor measuring a first heater of the plurality of heaters or a heated area of the heated member heated by the first heater. The plurality of heaters and the first temperature sensor are connected in series by a first power supply line.

Fixing device, image forming apparatus

A fixing device includes a fixing belt, a heating portion, and a belt guide member. The heating portion heats the fixing belt. The belt guide member includes a guide portion and an engaging portion. The guide portion guides the fixing belt to move along a moving path. The engaging portion is provided to project from the guide portion outward in a width direction of the fixing belt, wherein the engaging portion is engaged with a connector at an engagement position that intersects with a plane that includes a center, in the width direction, of the connector attached to the heating portion in an attachment direction perpendicular to the width direction.

Fixing device capable of restricting electric connection state from becoming unstable, image forming apparatus

A fixing device includes a cylindrical rotatable fixing belt, a flat heater, a safety device, a heater holding part and a pressuring member. The flat heater has a plurality of heat generating parts. The safety device is arranged across two adjacent heat generating parts to interrupt power supply to the heat generating parts in a case where temperature reaches a threshold value. The heater holding part holds the flat heater so that the flat heater comes into contact with an inner circumference face of the fixing belt. The pressuring member sandwiches the fixing belt with the flat heater to form a pressuring area for sandwiching and conveying a sheet between the fixing belt and the pressuring roller.

A fixing device includes a cylindrical rotatable fixing belt, a flat heater, a heater holding part, a pressuring member, and a connector. In the flat heater, an electrode part, a feeder and a heat generating part are formed in the same face state. The heater holding part holds the flat heater so that the heat generating part faces to an inner circumference face of the fixing belt. The pressuring member sandwiches the fixing belt with the flat heater. The connector has a contacting portion coming into contact with the electrode part. The feeder has a portion arranged at a near side from the electrode part in an attaching direction of the connector. The heater holding part includes a protecting portion covering the portion of the feeder arranged at the near side from the electrode part.

A heating unit includes a circuit board, a plurality of heating parts, and a plurality of wiring parts. The heating parts are arranged in a first direction on a surface of the circuit board. The wiring parts are provided on the surface of the circuit board and electrically connect the heating parts and a power source to feed the heating parts. The wiring parts respectively include electrode terminal parts electrically connected to the power source outside the heating parts in the first direction. Sizes in a second direction orthogonal to the first direction of the heating parts are set to decrease gradually or stepwisely with separating in the first direction from the electrode terminal parts.

Heating unit, fixing device, and image forming apparatus

A heating unit includes a circuit board, heating parts, and electrode parts. The heating parts are arranged in a first direction on a surface of the circuit board. The electrode parts are disposed on the surface of the circuit board, and electrically connected to both sides of the heating parts in a second direction that is orthogonal to the first direction. Each of the heating parts includes a plurality of heating resistors that is arranged in the first direction. Each of the heating resistors has a size ratio of a first length in the second direction to a second length in the first direction is 1 or more and 100 or less.

Heating unit including heating parts, in which each heating part includes heating resistors, fixing device including this heating unit, and image forming apparatus including this fixing device

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Osaka, Japan

Hiroki Kawasaki