Abstract: The image forming apparatus, in the case where the image forming apparatus determines that a replaceable unit is replaced in a first state in which removal of the replaceable unit is inhibited, performs control to switch from the first state to a second state in which removal of the replaceable unit is allowed.

Abstract: In a case in which an image forming apparatus determines that a replaceable unit is replaced in a first state, in which removal of the replaceable unit is inhibited, the image forming apparatus performs control to switch from the first state to a second state, in which removal of the replaceable unit is allowed.

Abstract: An apparatus comprising a first control unit that executes density correction processing on image data and generates an image signal, an image forming unit that forms an image on a recording medium on the basis of the image signal, and a second control unit that controls the image forming unit. The first control unit includes a specifying unit that transmits specifying information relating to the density correction processing to the second control unit. The second control unit includes an acquisition unit that acquires a parameter relating to the image forming apparatus, and an estimation unit that estimates a plurality of image densities corresponding to tone levels identified by the specifying information transmitted from the first control unit on the basis of the parameter acquired by the acquisition unit and transmits the plurality of image densities to the first control unit.

Abstract: An apparatus comprising a first control unit that executes density correction processing on image data and generates an image signal, an image forming unit that forms an image on a recording medium on the basis of the image signal, and a second control unit that controls the image forming unit. The first control unit includes a specifying unit that transmits specifying information relating to the density correction processing to the second control unit. The second control unit includes an acquisition unit that acquires a parameter relating to the image forming apparatus, and an estimation unit that estimates a plurality of image densities corresponding to tone levels identified by the specifying information transmitted from the first control unit on the basis of the parameter acquired by the acquisition unit and transmits the plurality of image densities to the first control unit.

Abstract: In a case in which an image forming apparatus determines that a replaceable unit is replaced in a first state, in which removal of the replaceable unit is inhibited, the image forming apparatus performs control to switch from the first state to a second state, in which removal of the replaceable unit is allowed.

Abstract: In a case in which an image forming apparatus determines that a replaceable unit is replaced in a first state, in which removal of the replaceable unit is inhibited, the image forming apparatus performs control to switch from the first state to a second state, in which removal of the replaceable unit is allowed.

Abstract: The image forming apparatus, in the case where the image forming apparatus determines that a replaceable unit is replaced in a first state in which removal of the replaceable unit is inhibited, performs control to switch from the first state to a second state in which removal of the replaceable unit is allowed.

Abstract: A double-feed detection apparatus includes a sensor configured to detect double feed of transfer materials conveyed along a conveying path, and a control unit configured to execute detection of the transfer material under conveyance plural times with the sensor, and to determine the double feed of the transfer materials based on detection results. The control unit determines a detection timing based on both a distance along the conveying path from the sensor to an image forming unit which forms an image on the transfer material and a length of the transfer material in the feed direction.

Abstract: An image forming apparatus is capable of more accurately detecting the relationship between an actual amount of color deviation and an estimated amount of color deviation. The image forming apparatus forms a color deviation detection mark at timing when the estimated amount of deviation reaches a threshold value. The timing is different from the timing when it is determined that it is necessary to perform normal calibration. The image forming apparatus determines the relationship between the actual amount of deviation of an image forming position from a reference and the estimated amount of deviation to set an estimating unit for estimating the amount of deviation.

Abstract: A double-feed detection apparatus includes a sensor configured to detect double feed of transfer materials conveyed along a conveying path, and a control unit configured to execute detection of the transfer material under conveyance plural times with the sensor, and to determine the double feed of the transfer materials based on detection results. The control unit determines a detection timing based on both a distance along the conveying path from the sensor to an image forming unit which forms an image on the transfer material and a length of the transfer material in the feed direction.

Abstract: A double-feed detection apparatus includes a sensor configured to detect double feed of transfer materials conveyed along a conveying path, and a control unit configured to execute detection of the transfer material under conveyance plural times with the sensor, and to determine the double feed of the transfer materials based on detection results. The control unit determines a detection timing based on both a distance along the conveying path from the sensor to an image forming unit which forms an image on the transfer material and a length of the transfer material in the feed direction.

Abstract: An image forming apparatus to which a paper handling unit is connected thereto is provided. The image forming apparatus detects the size of a sheet in a direction in which the sheet is conveyed for image formation. The image forming apparatus outputs sheet size mismatch information indicating that the size of the sheet does not match a predetermined size to the paper handling unit before a size detecting operation thereof has been completed detecting the trailing edge of the sheet is greater than the predetermined size.

Abstract: An image forming apparatus to which a paper handling unit is connected thereto is provided. The image forming apparatus detects the size of a sheet in a direction in which the sheet is conveyed for image formation. The image forming apparatus outputs sheet size mismatch information indicating that the size of the sheet does not match a predetermined size to the paper handling unit before a size detecting operation thereof has been completed detecting the trailing edge of the sheet is greater than the predetermined size.

Abstract: An image forming apparatus is capable of more accurately detecting the relationship between an actual amount of color deviation and an estimated amount of color deviation. The image forming apparatus forms a color deviation detection mark at timing when the estimated amount of deviation reaches a threshold value. The timing is different from the timing when it is determined that it is necessary to perform normal calibration. The image forming apparatus determines the relationship between the actual amount of deviation of an image forming position from a reference and the estimated amount of deviation to set an estimating unit for estimating the amount of deviation.

Abstract: A double-feed detection apparatus includes a sensor configured to detect double feed of transfer materials conveyed along a conveying path, and a control unit configured to execute detection of the transfer material under conveyance plural times with the sensor, and to determine the double feed of the transfer materials based on detection results. The control unit determines a detection timing based on both a distance along the conveying path from the sensor to an image forming unit which forms an image on the transfer material and a length of the transfer material in the feed direction.

Abstract: An image forming apparatus includes a plurality of photosensitive drums, a plurality of developing devices, an intermediate transfer medium, primary transfer members, and a secondary transfer member for transferring toner images onto a transfer material. A full-color mode and a monocolor mode are selectively carried out. The image forming apparatus also includes a CPU for adjusting the length of a non-image forming region, and an intermediate-transfer-medium movement controller. The CPU brings about a switching state in which an image forming region lies between a primary transfer position on the most downstream one of the photosensitive drums and a secondary transfer position and in which non-image forming regions simultaneously lie at the primary transfer position and at the secondary transfer position. The intermediate-transfer-medium movement controller switches between the full-color mode and the monocolor mode during the switching state.

Abstract: An image forming apparatus to which a paper handling unit is connected thereto is provided. The image forming apparatus detects the size of a sheet in a direction in which the sheet is conveyed for image formation. The image forming apparatus outputs sheet size mismatch information indicating that the size of the sheet does not match a predetermined size to the paper handling unit before a size detecting operation thereof has been completed detecting the trailing edge of the sheet is greater than the predetermined size.

Abstract: An image forming apparatus includes a plurality of photosensitive drums, a plurality of developing devices, an intermediate transfer medium, primary transfer members, and a secondary transfer member for transferring toner images onto a transfer material. A full-color mode and a monocolor mode are selectively carried out. The image forming apparatus also includes a CPU for adjusting the length of a non-image forming region, and an intermediate-transfer-medium movement controller. The CPU brings about a switching state in which an image forming region lies between a primary transfer position on the most downstream one of the photosensitive drums and a secondary transfer position and in which non-image forming regions simultaneously lie at the primary transfer position and at the secondary transfer position. The intermediate-transfer-medium movement controller switches between the full-color mode and the monocolor mode during the switching state.

Abstract: In an image forming apparatus and an image forming method, a paper position aberration detecting sensor including a light emitting element and a light receiving element is disposed in the paper conveying path of the image forming apparatus. The amount of paper position aberration in paper conveyance is detected by a counter, and on the basis of the result of the detection, a CPU controls the writing start position of a printed image.

Abstract: This invention provides an image forming apparatus and an image forming method in which even if paper position aberration occurs, printed image position aberration is prevented from occurring by a simple methanism. A paper position aberration detecting sensor including a light emitting element and a light receiving element is disposed in the paper conveying path of the image forming apparatus, and the amount of paper position aberration in paper conveyance is detected by a counter, and on the basis of the result of the detection, a CPU controls the writing start position of a printed image.