摘要:
A transfer device (29) including a combination which includes an intermediate transfer medium (10) ; and at least one transfer member (62; 16) configured to transfer a toner image while contacting a backside of the intermediate transfer medium and applying a transfer bias thereto, wherein the combination has a property such that when the combination is repeatedly subjected to charging and discharging, in which a voltage of absolute value of 1 kV is applied for 60 seconds, and then discharging is performed for 10 seconds, 300 times while measuring a combined volume resistivity of the combination, an absolute value of logarithmic difference between a first combined volume resistivity and a 300 th combined volume resistivity is not greater than 0.8 [log (Ω · cm)].
摘要:
An image forming apparatus includes an image carrier (40), an endless belt (10) whose front surface moves endlessly and contacts the image carrier to form a transfer nip, and a bias applying roller (62) configured to apply a transfer bias to a back surface of the endless belt. An image is formed of a toner having an additive embedded rate of not less than 40 percent. The toner includes a mother particle having a binder resin and a colorant, and an external additive. The bias applying roller (62) is located so as to satisfy a relationship, L > (A/2)+(B/2)+C, where A is a diameter of the image carrier (40), B is a diameter of the bias applying roller (62), C is a thickness of the endless belt (10), and L is a distance between centers of the image carrier and the bias applying roller, on a virtual plane perpendicular to an axis direction of the image carrier.
摘要:
An image forming apparatus includes an image bearing member (20Y), supporting rollers (15,16), a belt-like-shaped medium (10), a primary transfer member (12Y), a secondary transfer member (5), and a grounded conductive roller. The image bearing member forms a toner image at a predetermined process speed. The belt-like shaped medium has a charge voltage. The primary transfer member sequentially transfers the toner image onto the belt-like-shaped medium and the secondary transfer member transfers the toner image onto a recording sheet (2). The conductive roller is arranged in contact with the belt-like shaped medium by a predetermined wrapping length. A relationship Tb
摘要:
A multi-layer endless belt member (201), which is applicable to a transfer unit (200) for use in an image forming apparatus (1), includes a base layer (201b, 201d, 201f, 201j) and a surface layer (201a, 201c, 201e, 201g, 201h) disposed on the base layer and having a higher resistivity and has a first resistivity of a first surface thereof and a second resistivity of a second surface thereof opposite the first surface different from the first resistivity. The second resistivity of the second surface ranges from 9.0 to 12.5 in a common logarithm value (log[Ω/square]) when measured after 500V is applied for 10 seconds. An amount of resistivity change in the first resistivity ranges from 0.5 to 1.5 after application of 100V and is 0.2 or smaller after application of 500V. An amount of resistivity change in the second resistivity is 0.1 or smaller after application of 100V and 500V.
摘要:
An intermediate image transfer type of image forming apparatus of the present invention includes an image carrier (40), an intermediate image transfer body (10), primary image transferring means (62) for transferring a toner image from the image carrier (40) to the intermediate image transfer body (10), and secondary image transferring means (22) for transferring the toner image from the intermediate image transfer body (10) to a sheet. When the surface resistivity of the intermediate image transfer body (10) is measured by a method that repeatedly applies a voltage of 200 V for 60 seconds to the intermediate image transfer body (10) and grounds the intermediate image transfer body (10) for 10 seconds 1,000 consecutive times, a difference in absolute value between the logarithm of the first time of measurement and that of the thousandth time of measurement is 0.5 log Ω/□ or below.
摘要:
An image forming apparatus includes a cleaning device (9) for cleaning an intermediate image transfer body (4). A cleaning blade included in the image transfer body cleaning device is formed of fluorocarbon resin or a thin layer of fluorocarbon resin is formed on the surface of the intermediate image transfer body. Further, wax is coated on the intermediate image transfer body or wax or lubricant powder is contained in toner. A moving mechanism holds the cleaning blade spaced from the intermediate image transfer body at least when image formation is not under way.
摘要:
An image forming apparatus includes a cleaning device (9) for cleaning an intermediate image transfer body (4). A cleaning blade included in the image transfer body cleaning device is formed of fluorocarbon resin or a thin layer of fluorocarbon resin is formed on the surface of the intermediate image transfer body. Further, wax is coated on the intermediate image transfer body or wax or lubricant powder is contained in toner. A moving mechanism holds the cleaning blade spaced from the intermediate image transfer body at least when image formation is not under way.