Canon Kabushiki Kaisha

Kota Mori

Kenichiro Kitajima

Yoshiro Tsukada

Tohru Nakaegawa

Shuichi Tamura

Naoyuki Yamamoto

Takeshi Fujino

Jiro Kinokuni

Michihiro Yoshida

Yuya Nagatomo

Tadashi Fukuda

Masami Hano

Takeshi Ohtsu

Takashi Kase

Akinori Miyamoto

Mikihiro Akasaki

Yoshihiro Ogawa

Kazuto Hosoi

Daisuke Tsujimoto

Ryuichiro Matsuo

Shohei Okumura

An image forming system includes an image forming apparatus including an image forming unit and a fixing unit; a folding processing portion; a pressure-bonding portion; and an input portion capable of selecting a pressure-bonding mode in which a pressure-bonding print prepared by subjecting the recording material to pressure-bonding processing by the folding processing portion and the pressure-bonding portion and capable of selecting a layout of the toner image formed on the recording material. When the pressure-bonding mode is selected, the layout depending on the pressure-bonding mode is selected.

Image forming system

An image forming system includes an image forming apparatus including a stacking portion, an image forming unit, and a fixing portion; a pressure-bonding processing apparatus including a folding processing portion, and a pressure-bonding portion; an inputting portion capable of inputting directions of a front surface and a back surface of the recording material stacked on the stacking portion; and a displaying portion for displaying a message indicating that a pressure-bonding printed matter is not properly prepared in a case that directions of the front surface and the back surface of the recording material inputted by the inputting portion are different from directions of the front surface and the back surface of the recording material in which the pressure-bonding printed matter is capable of being properly prepared.

An image forming system includes an image forming apparatus, a pressure-bonding processing apparatus, an inputting portion, and a controller. The controller changes, in a case that directions of a front surface and a back surface of a recording material inputting portion and different from the directions of the front surface and the back surface in which a pressure-bonding printed matter is capable of being properly prepared, an image formation order of image forming data to an order in which the pressure-bonding printed matter is capable of being properly prepared in the directions of the front surface and the back surface of the recording material inputted by the inputting portion.

An image forming system includes an image forming apparatus including a fixing unit, a folding processing portion, and a pressure-bonding portion. A first recording material having a first basis weight is fixed at a first temperature by the fixing unit and then is pressure-bonded by the pressure-bonding portion after a lapse of a first period. A second recording material having a second basis weight is fixed at a second temperature by the fixing unit and then is pressure-bonded by the pressure-bonding portion after a lapse of a second period. The second basis weight is larger than the first basis weight. The second temperature is higher than the first temperature. The second period is longer than the first period.

An image forming system includes an image forming apparatus, a pressure sealing processing apparatus, and a control unit. The control unit is configured to permit execution of the pressure sealing processing process by the pressure sealing processing apparatus on a recording material of which a grammage is smaller than a predetermined grammage, and is configured not to permit execution of the pressure sealing processing process by the pressure sealing processing apparatus on a recording material of which a grammage is equal to or more than the predetermined grammage.

An image forming apparatus includes an image bearing member configured to bear an image and a charging roller to which a direct current voltage is applied and which is configured to charge a surface of the image bearing member. The charging roller includes a shaft member, an elastic layer formed around the shaft member, and a surface layer formed around the elastic layer. Particles having particle diameters within a range of 2 &#x3bc;m or larger and 15 &#x3bc;m or smaller are dispersed in the surface layer. A maximum height Sz (&#x3bc;m) and an autocorrelation length Sal (&#x3bc;m) with respected to the surface layer of the charging roller satisfy 8&#x2264;Sz&#x2264;16 and 13&#x2264;Sal&#x2264;30.

Image forming apparatus

A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00&#x3c;x&#x2264;0.80, and (ii) the difference between x and xp 'xp&#x2212;x' satisfying 0.00&#x3c;xp&#x2212;x&#x2264;0.95, where xp is the maximum peak value (atomic %) of the Sr element abundance in the region from the outermost surface to 50 nm.

Toner

An image forming apparatus in which occurrence of an image failure in association with contamination caused by an external additive, such as silica, adhering to a charging unit is suppressed. The image forming apparatus is configured to charge an image bearing member through use of the charging unit, and uses toner having, on a surface thereof, strontium titanate particles and silica particles having predetermined physical properties.

An image forming apparatus includes a photosensitive member, a charging roller, a cleaning roller, an urging member and an image forming portion. The charging roller has an outermost surface layer including an electroconductive resin material, first surface particles having an average particle size of more than 7 &#x3bc;m and less than 30 &#x3bc;m and second surface particles having an average particle size of more than 2 &#x3bc;m and less than 6 &#x3bc;m. The first and second surface particles are dispersed in the electroconductive resin material so as to form first projections and second projections, respectively. The cleaning roller cleaning roller includes a shaft portion and an elastic cleaning portion extending helically around the shaft portion and having a rectangular cross-section perpendicular to an extending direction thereof.

Image forming apparatus and cartridge having a charging roller with a surface layer including projections

An image forming apparatus includes a photosensitive member having a surface having elastic deformation power of 47% or more, a charging roller forming a nip between itself and the photosensitive member, and an image forming portion. When a nip region corresponding to the nip is formed and then an area of independent contact portions between the charging member and a measuring contact member is measured, the following relationship is satisfied: (contact width X)&#xd7;(Contact area ratio &#x3b1;)&#x2264;0.1, where a length from a position of one end to a position of the other end of the nip region with respect to a direction perpendicular to a longitudinal direction of the charging roller is the contact width X, and a ratio of a sum of areas of the independent contact portions to an entire area of a measuring region is the contact area ratio &#x3b1;.

Image forming apparatus and cartridge having charging roller

A charging roller includes a surface layer containing first and second surface particles and satisfying the following:6.0 (&#x3bc;m)&#x2264;&#x2264;18.8 (&#x3bc;m),&#x2003;&#x2003;iwhere Rz is a ten-point average roughness (&#x3bc;m) of a charging roller surface,7 (&#x3bc;m)&#x2264;&#x2264;20 (&#x3bc;m),&#x2003;&#x2003;iiwhere d is a thickness (&#x3bc;m) of the surface layer,9.8 (&#x3bc;m)&#x2264;1&#x2264;15.8 (&#x3bc;m) and 2.8 (&#x3bc;m)&#x2264;2&#x2264;5.2 (&#x3bc;m),&#x2003;&#x2003;iiiwhere D1 and D2 are average particle size (&#x3bc;m) of the first surface particles, and the second surface particles, respectively,3.0&#x2264;1/2&#x2264;5.6, and&#x2003;&#x2003;iv0.10&#x2264;1/(1+2)&#x2264;0.32,&#x2003;&#x2003;vwhere M1 is a total weight (mg) of the first surface particles per unit area of the charging roller surface, and M2 is a total weight (mg) of the second surface particles per unit area of the charging roller surface.

Charging roller, cartridge, image forming apparatus and manufacturing method of the charging roller

An image forming apparatus includes a photosensitive member, a charging roller, a voltage source, a current detecting member, and a setting portion configured to set the DC voltage applied to the charging roller in an image forming period on the basis of a detection result of the detecting member when a DC voltage less than a discharge start voltage is applied from the voltage source to the charging roller in a period other than the image forming period, wherein the setting portion sets the DC voltage so that an absolute value of the DC voltage when an absolute value of the detected current is a first value is larger than an absolute value of the DC voltage when the absolute value of the detected current is a second value smaller than the first value.

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Abiko, Japan

Kota Mori