Abstract: An image forming apparatus includes a control unit configured to be able to perform density adjustment control of forming a reference toner image for image density control on an image bearing member and changing a target value of a toner density based on an image density of the reference toner image detected by an image density detection unit. The control unit limits the target value of the toner density within a predetermined range, and changes frequency of execution of the density adjustment control based on the fact that the target value of the toner density is placed at a boundary value.

Abstract: An image forming apparatus includes a calculation portion calculates an image ratio of the electrostatic image to be formed. A controller controls the developer supply from a developer supplier to the developing unit based on the toner density output of the inductance sensor. An adjustment portion adjusts the density of the toner output from the toner density detection portion to a higher value in a case where the image ratio calculated by the calculation portion is higher than a predetermined image ratio.

Abstract: An image forming apparatus includes an image bearing member; a developing device; a supply device that supplies the developing device with toner; a density detector that detects information about a toner density serving as a ratio of toner and carrier of the developer of the developing device; and a controller that is able to execute a remaining amount determination mode which interrupts the image forming operation and performs a toner supply operation on the developing device from the supply device, based on the detection result of the density detector. The controller at least selectively executes a first state that immediately prohibits the image formation, a second state that allows the image forming operation, and a third state that executes the mode again, based on the detection result of the density detector acquired after the start of execution of the mode.

Abstract: An image forming apparatus includes a control unit configured to be able to perform density adjustment control of forming a reference toner image for image density control on an image bearing member and changing a target value of a toner density based on an image density of the reference toner image detected by an image density detection unit. The control unit limits the target value of the toner density within a predetermined range, and changes frequency of execution of the density adjustment control based on the fact that the target value of the toner density is placed at a boundary value.

Abstract: A compressor includes: an impeller attached to a rotation shaft; and a casing covering the impeller from the outside of the rotation shaft in a radial direction. The casing includes a plurality of stationary members that are connected to each other in an axial direction of the rotation shaft and in which a flow path-forming surface is toward the axial direction is formed. The flow path-forming surfaces of two stationary members adjacent in the axial direction face each other to form a flow path extending in the radial direction of the rotation shaft. At least one stationary member in the axial direction among the adjacent stationary members includes: a stationary member main body in which the flow path-forming surface is formed.

Abstract: An image forming apparatus includes an image bearing member, a developing device configured to develop an electrostatic image formed on the image bearing member into a toner image, and an exchangeable developer container configured to supply the developer into the developing device. A content sensor detects information relating to a toner content in the developing device, and an exchange detecting portion detects an exchanging operation of the developer container. A controller controls a supplying operation for supplying the developer from the developer container to the developing device on the basis of a detection result of the content sensor and executes a developer supplying mode for supplying developer prohibiting an image forming operation. The controller controls the supplying operation so as to permit the image forming operation without executing the developer supplying mode until an amount of formed images reaches a predetermined level.

Abstract: An image forming apparatus includes an image bearing member configured to carry an image, a developing device configured to develop a latent image with a developer including toner and carrier, and a toner content sensor configured to detect a ratio of the toner to the developer in the developing device. A toner container contains the toner to be supplied to the developing device, and a notifying portion notifies necessity for exchange of the toner container when the ratio indicated by the output of the sensor reaches a set level lower than the predetermined range.

Abstract: The present invention is a combustor provided with a combustor transition pipe connected to a turbine while interposing a transition pipe seal in between, including a flange portion provided at an end portion on a downstream side in a fluid flow direction of the combustor transition pipe, the flange portion projecting to radially inside and extending in a circumferential direction. The flange portion includes a pin hole into which a pin to position the transition pipe seal is inserted, a circumferential slit portion either extending within a range in a radial direction where the pin hole is formed or being located on radially outside of the pin hole and extending in the circumferential direction, and a hole portion on which part of the circumferential slit portion abuts.

Abstract: An image forming apparatus includes an image bearing member, a developing device, a driving device, and a controller. The developing device includes a developing container, a first feeding member, a second feeding member, a developer carrying member, a content sensor, and a sealing member. Wherein when the controller executes an initializing operation for removing the sealing member from the first opening and the second opening while driving the first feeding member and the second feeding member, the controller provides notification of abnormality when the controller discriminates that an amount of the developer in the second chamber is larger than a predetermined amount at a predetermined timing on the basis of an output of the content sensor.

Abstract: An image forming apparatus includes a photosensitive drum for carrying an image; a developing device for developing a latent image with a developer including toner and carrier; a sensor for detecting an amount of magnetization of the developer per unit volume in the developing device; and a controller for controlling an image forming condition so as to change, on the basis of a detection result of the sensor, a development contrast which is a potential difference between an image portion potential of a maximum image density in the latent image and a development DC bias potential applied to the developing device. The controller controls the condition on the basis of the detection result such that when the amount is a first predetermined value, the development contrast is smaller than that when the amount is a second predetermined value which is larger than the first predetermined value.

Abstract: An image forming apparatus includes an image bearing member capable of carrying an electrostatic image; a developing device configured to develop an electrostatic image formed on the image bearing member into a toner image, using a developer including toner and carrier; an exchangeable supply container configured to supply the developer into the developing device; a content sensor capable of detecting information relating to a toner content in the developing device; an exchange detecting portion configured to detect information for discriminating an event of exchanging operation of the supply container; and a controller configured to control a supplying operation from the supply container, on the basis of a detection result of the content sensor, wherein the controller is capable of prohibiting an image forming operation on the basis of the detection result of the content sensor and is capable of releasing the prohibition of the image forming operation on the basis of the detection result of the exchange sens

Abstract: An image forming apparatus includes an image bearing member, a developing device, a driving device, and a controller. The developing device includes a developing container, a first feeding member, a second feeding member, a developer carrying member, a content sensor, and a sealing member. When information that the developing device is new is inputted, before an image forming operation is executed, the controller executes an initializing operation for driving the first feeding member and the second feeding member. The controller provides notification to the effect that the sealing member is not removed on the basis of an output of the content sensor during the initializing operation.

Abstract: An image forming apparatus, which prohibits an image forming operation based on a detection result of a remaining amount detecting unit, thereafter immediately allows the image forming operation based on a detection result of a replacement detecting unit, performs a supply restriction mode which restricts a toner supply amount such that a toner supply amount in a predetermined initial period after allowing the image forming is smaller than that in a normal mode in a case where a detection result of a toner density detecting unit and a target value are under the same conditions, respectively.

Abstract: An image forming apparatus includes: an image bearing member; a developing device; a supply device which supplies toner to the developing device; a density detector which detects information about a toner density as a ratio of toner and carrier of the developer of the developing device; and a controller which interrupts an image forming operation and is capable of executing a forced supply mode of performing the toner supply to the developing device from the supply device, based on first information of at least one of detection results of the density detector and information about a toner consumption, second information about the amount of supply operation supplied by the supply device, in which the controller determines whether or not to execute the forced supply mode, and third information about an accumulated value of the amount of toner consumption after the forced supply mode executed last time.

Abstract: An image forming apparatus includes an image forming portion; a supplying device for supplying a toner; a transfer device capable of transferring the toner image from the image forming portion onto a toner image receiving member; a first detecting portion for detecting a transfer current of the transfer device; a second detecting portion for detecting information on a toner amount of the transferred toner image; and a controller for controlling, during non-image formation, a supplying operation of the supplying device on the basis of a detection result of the first detecting portion when a toner image for measurement formed at the image forming portion is transferred by the transfer device at a transfer voltage lower than a discharge start voltage and on the basis of a detection result when the toner image for measurement transferred on the toner image receiving member is detected by the second detection portion.

Abstract: An image forming apparatus which prohibits an image forming operation based on a detection result of a remaining amount detecting unit, thereafter immediately allows the image forming operation based on a detection result of a replacement detecting unit, performs a supply restriction mode which restricts a toner supply amount such that a toner supply amount in a predetermined initial period after allowance of an image forming is smaller than a normal mode in a case where a detection result of a toner density detecting unit and a target value are under same conditions, respectively.

Abstract: An image forming apparatus includes: an image bearing member; a developing device; a supply device that supplies the developing device with toner; a density detector that detects information about a toner density serving as a ratio of toner and carrier of the developer of the developing device; and a controller that is able to execute a remaining amount determination mode which interrupts the image forming operation and performs a toner supply operation on the developing device from the supply device, based on the detection result of the density detector, wherein the controller at least selectively executes a first state that immediately prohibits the image formation, a second state that allows the image forming operation, and a third state that executes the mode again, based on the detection result of the density detector acquired after the start of execution of the mode.

Abstract: An image forming apparatus includes: an image bearing member; a developing device; a supply device which supplies toner to the developing device; a density detector which detects information about a toner density as a ratio of toner and carrier of the developer of the developing device; and a controller which interrupts an image forming operation and is capable of executing a forced supply mode of performing the toner supply to the developing device from the supply device, based on first information of at least one of detection results of the density detector and information about a toner consumption, second information about the amount of supply operation supplied by the supply device, in which the controller determines whether or not to execute the forced supply mode, and third information about an accumulated value of the amount of toner consumption after the forced supply mode executed last time.

Abstract: A compressor includes a cylindrical casing, a bundle 3 which includes a tubular stationary member and a rotor accommodated into the stationary member, and is inserted into an inner portion of the casing, and a roller 11 configured to roll on an inner circumferential surface of the casing while supporting the bundle 3 when the bundle 3 is inserted into the inner portion of the casing along an axial direction. An outer circumferential surface 23 of the roller 11 is formed in a continuous convex curved surface so that a curvature radius of an end side along a rotating shaft 21 of the roller 11 is smaller than a curvature radius of a center.

Abstract: An image forming apparatus includes photosensitive drums, electrostatic latent image forming units, developing sleeves, patch detection sensors which detect image densities of the toner images formed by the electrostatic latent image forming units, and toner replenishment units which replenish the developing sleeves with the toner based on the detection results of the patch detection sensors. Further, controllers are provided to control the rotation speeds of the developing sleeves at the time of forming the reference toner image to be higher than the rotation speeds of the developing sleeves at the time of forming a normal image.