摘要:
An image forming apparatus includes an image carrying member, a charging device, an exposure device, a development device, a development voltage power supply, a humidity detection device and a controller. The exposure device exposes the surface of the image carrying member charged by the charging device to form an electrostatic latent image. The development device includes a development container which stores a developer including a toner and a developer carrying member which supplies, to the image carrying member, the toner in the developer, and develops the electrostatic latent image into a toner image. The development voltage power supply applies, to the developer carrying member, a development voltage with an alternating voltage superimposed on a direct voltage. The humidity detection device detects an absolute humidity around the development device. The controller stepwise increases the frequency of the alternating voltage as the absolute humidity detected by the humidity detection device is increased.
摘要:
An image forming system includes an image former, a detector, and a first reader. The image former forms an image on a recording medium. The detector is provided upstream of the image former in a conveyance direction of the recording medium, and detects a physical property of the recording medium. The first reader is provided downstream of the image former in the conveyance direction of the recording medium, and reads the recording medium. The first reader is controlled based on a detection result of the detector, and the detector is controlled based on a reading result of the first reader.
摘要:
A characteristic detector includes two electrodes facing each other to form a passage through which a medium passes, a cover disposed between the two electrodes, a current generator to supply a current between the two electrodes, a capacitance gauge to measure a capacitance generated between the two electrodes, and circuitry. The two electrodes have a shape or an arrangement in which at least two points on a leading end of the medium enter the passage with a time lag. The cover covers one of the two electrodes in connection with a size of the medium. The capacitance gauge detects the size of the medium based on the measured capacitance. The circuitry calculates a characteristic of the medium based on the capacitance measured by the capacitance gauge and the size of the medium detected by the capacitance gauge.
摘要:
An image forming apparatus includes a plurality of image carriers, an intermediate transfer body, a plurality of primary transfer members, a secondary transfer member, a first guide member, and a controller. The first guide member guides a recording medium along a conveying direction. The controller controls a primary transfer bias and a secondary transfer bias. A plurality of the primary transfer members include an upstream side primary transfer member and a downstream side primary transfer member. The controller makes an absolute value of the primary transfer bias applied to the downstream side primary transfer member larger than an absolute value of the primary transfer bias applied to the upstream side primary transfer member. The controller lowers an absolute value of the secondary transfer bias when the recording medium separates from the first guide member.
摘要:
An image forming apparatus has: an image supporting member; a charger in proximity to the image supporting member; a power source unit configured to apply charging voltages to the charger sequentially, the charging voltages including alternating voltages having different peak-to-peak voltages, respectively; an amperometric detector configured to detect values of alternating currents flowing in the charger during application of the charging voltages; and a processor configured to carry out a first charging voltage determination process or a second charging voltage determination process requiring a shorter time than the first charging voltage determination process selectively based on a detection result of the amperometric detector. The processor carries out the first charging voltage determination process or the second charging voltage determination process selectively in accordance with a difference between an ambient temperature at a previous time of carrying out the first charging voltage determination process and a current ambient temperature.
摘要:
An area calculating unit calculates an image area of a toner image formed on a sheet recording member. A behavior detecting unit detects behavior of the recording member fed out of a conveying nip formed by a pair of conveying members. A thickness obtaining unit obtains thickness information of the recording member. An index calculating unit calculates an index value indicating windability of the recording member with respect to the conveying members based on the image area, the behavior, and the thickness information.
摘要:
An image forming apparatus includes a housing, a detection unit provided in the housing to detect temperature or humidity, an image forming section provided in the housing and including a detected portion to be detected by the detection unit, a first air inlet provided in the housing, a suction unit that sucks air outside of the housing through the first air inlet, a substantially cylindrical duct provided at a position influenced by temperature or humidity of the detected portion and including an entrance from which air flows in and an exit from which air flows out, the duct allowing the air sucked by the suction unit to pass therethrough, and an opening provided in the housing. The detection unit is provided at a position on a path of air flowing into the housing through the opening and on a path of the air that has passed through the duct.
摘要:
An information processor includes a storage unit storing a first coefficient in correspondence with a characteristic of a sheet of paper, a first acquisition unit acquiring a first signal based on the water content of a first sheet of paper not having an image formed thereon, a second acquisition unit acquiring a second signal based on the water content of the first sheet of paper having an image formed thereon and being heated for fixing, a determination unit determining the characteristic of the first sheet of paper, a first calculation unit calculating a variation in water content of the first sheet of paper using the difference between the first signal and the second signal and the first coefficient stored in correspondence with the determined characteristic, and a second calculation unit calculating an expansion and contraction ratio of the first sheet of paper using the variation in water content.
摘要:
An image forming apparatus includes a housing, a detection unit provided in the housing to detect temperature or humidity, an image forming section provided in the housing and including a detected portion to be detected by the detection unit, a first air inlet provided in the housing, a suction unit that sucks air outside of the housing through the first air inlet, a substantially cylindrical duct provided at a position influenced by temperature or humidity of the detected portion and including an entrance from which air flows in and an exit from which air flows out, the duct allowing the air sucked by the suction unit to pass therethrough, and an opening provided in the housing. The detection unit is provided at a position on a path of air flowing into the housing through the opening and on a path of the air that has passed through the duct.
摘要:
An image forming apparatus includes a transfer device to transfer a toner image formed on an image bearing member onto a recording medium, a sheet separation device to separate the recording medium from the image bearing member, a sheet separation bias application device to apply to the sheet separation device a sheet separation bias in which an alternating current (AC) component is superimposed on a direct current (DC) component, and a transfer bias application device to selectively apply to the transfer device one of a DC transfer bias having a DC component and a superimposed transfer bias in which an AC component is superimposed on a DC component. Upon application of the superimposed transfer bias to the transfer device, the sheet separation bias applied to the sheet separation device is changed from the sheet separation bias applied upon application of the DC transfer bias to the transfer device.