PURPOSE:To provide an image forming device which is efficient when parts of plural documents are copied by placing the plural documents on the document feed table of an automatic document feeder, making copies of only required pages, passing the unrequired documents by the original table without copying them, and arranging the stack of documents in the original page order CONSTITUTION:A document is carried on the document table when a copy key 62a or a sheet pas key 57 is turned on in the state in which a stack of documents is placed on the document feed table The documents are ejected onto the sheet ejection table in order The copy requested by the use of the copy key 62a is ejected onto a sheet ejection tray When all of the documents on the document feed table are ejected on the sheet ejection table, the order of the documents on the sheet ejection table corresponding to the state of the documents placed on the document feed table Only a required copy is ejected on the sheet ejection tray; here, when the sheet feed key 57 is turned on, the main control part 61 judges that the sheet will be fed to the document, drives a carrying mechanism 72 by the use of a control part 71, and ejects the sheet onto the sheet ejection table by passing by the document table

Image forming device

A fixing apparatus of an image forming apparatus of the present invention, in arrival timing of a temperature falling area of a heat roller passing a nip at opposite position γ of an induction heating coil from temperature detection position β by an infrared temperature sensor around the heat roller, according to detection results by the infrared temperature sensor, controls an output value of the induction heating coil under control of an inverter circuit, heats and returns the heat roller in real time to a fixable temperature, and realizes energy conversation. At the time of arrival at the nip, the heat controller is always set to a fixed fixable temperature, thus in a fixed image, a high image quality free of ripple marks can be obtained.

Fixing device of image forming apparatus

A wet-type image forming apparatus includes a density detection unit and a charge amount control unit for controlling the charge amount of toner on a liquid developer carrier An image forming unit forms patch images while the charge amount control unit successively changes the charge amount of toner on the liquid developer carrier in a state in which a development bias is held at a prescribed value The density detection unit detects the image density of each patch image thereby detecting a range of the charge amount of toner in which the image density of the patch image is almost saturated The charge amount of toner in normal image formation is set to be equal to or greater than the range of the charge amount of toner in which the image density of the patch image is almost saturated

Wet type image forming apparatus

An image forming apparatus includes a first power calculator for calculating a power consumption amount of a driving load unit and a post-processing device based on at least one of measured values of a voltage and a current, which are supplied to the driving load unit and the post-processing device; second and third power calculators for calculating power consumption amounts of a fixing heater driving unit and a controller based on an operating state and an operating time of the image forming apparatus; and a power summing-up unit for calculating a power consumption amount of the image forming apparatus by summing up the power consumption amount calculated by the first power calculator and the power consumption amount predicted by each of the second and third power calculators.

Image forming apparatus calculating power consumption amount

Provided is a heater controlling unit that includes: a power factor correction circuit configured to convert a first alternating-current voltage supplied from a power supply into a direct-current voltage; an inverter configured to generate a second alternating-current voltage from the direct-current voltage converted by the power factor correction circuit; and a heater to which the second alternating-current voltage generated by the inverter is applied.

Heater control unit and image forming apparatus

PROBLEM TO BE SOLVED: To provide an image forming device provided with a liquid developing device capable of accelerating developing speed and reproducing a high-quality image uniform in half-tone density. SOLUTION: In this image forming device provided with an image carrier 10 on which an electrostatic latent image is formed at its surface and a developing ink carrier 44 for supplying a developing ink 42 to the carrier 10, the carrier 10 has a water repellent surface, and the carrier 44 has a surface layer 46 which can be impregnated with the developing ink and an electric resistance for applying developing bias voltage capable of moving the developing ink L to the image part of the electrostatic latent image on the carrier 10. By applying the prescribed developing bias voltage between the carriers 10 and 44, the ink L is stuck only to the image part of the electrostatic latent image on the carrier 10. Next, the developing image formed by the ink L is transferred on a transfer material.

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Image forming device