Abstract: A toner concentration sensing apparatus includes a first acquisition processing portion, a second acquisition processing portion, and a third acquisition processing portion. The first acquisition processing portion acquires a first sensing value corresponding to light reflected by a first region of an image-carrying member where a toner image is not formed. The second acquisition processing portion acquires a second sensing value corresponding to light reflected by a second region of the image-carrying member where a toner image has been formed. The third acquisition processing portion acquires a component ratio of a component in the second sensing value, that corresponds to light reflected by toner adhered onto a surface of the image-carrying member, using a specific calculation formula determined based on a first relational expression based on the first sensing value and a second relational expression not based on the first sensing value, and the second sensing value.

Abstract: A processor derives a plurality of unit density values which are each an average value of sensed densities for each of a plurality of unit areas sectioned for each unit length in a test toner image. The processor derives a weighted average of the plurality of unit density values to derive a test image density used for adjusting a control parameter in a printing portion. The unit length is a greatest common factor of two target lengths corresponding to perimeters of two types of target rotating members out of the plurality of rotating members. When a number of the plurality of unit areas is represented by n, n is a value obtained by subtracting 1 from an added value of a first constant and a second constant. The first constant and the second constant are values obtained by respectively dividing the two target lengths by the unit length.

Abstract: Recently, jobs involving transporting goods, tasks involving surveying a wide area, etc. using multicopters have increased, and it has become necessary for multicopters to fly for long periods of time, In the present invention, wings that are separate from the main body are provided all the way around or at individual locations around it to connect neighboring pairs of the multiple arms extending radially from it, in order to increase the multicopter’s lift and extend its flight time.

Abstract: Provided is an image forming apparatus and a sorting method allowing paper sheets to be sorted by size or thickness from a bundle of documents that have been already printed with no need for adding a sensor, or the like, or during the time for printing preparation, or the like. The image forming apparatus includes a first detecting part, a paper discharging part and a control part. The first detecting part detects the pass of an edge part of the document. The control part determines the length of a document along the direction of conveyance from the time required from the moment when the document reaches the first detecting part to the moment when it pass the first detecting part, determining the sorting destination.

Abstract: An image forming apparatus includes a controller. The controller includes a list display controller, a selection receiving section, a data request section, and an image formation controller. The list display controller acquires list data from a file server and causes display of the list data in the form of a list. The selection receiving section receives user selection of an article name from the list. The data request section requests image formation data corresponding to the article name that the user has selected from the file server. The image formation controller acquires image formation data and controls formation of an article image on a paper sheet based on the image formation data.

Abstract: An image forming apparatus includes a controller. The controller includes a list display controller, a selection receiving section, a data request section, and an image formation controller. The list display controller acquires list data from a file server and causes display of the list data in the form of a list. The selection receiving section receives user selection of an article name from the list. The data request section requests image formation data corresponding to the article name that the user has selected from the file server. The image formation controller acquires image formation data and controls formation of an article image on a paper sheet based on the image formation data.

Abstract: Provided is an image forming apparatus and a sorting method allowing paper sheets to be sorted by size or thickness from a bundle of documents that have been already printed with no need for adding a sensor, or the like, or during the time for printing preparation, or the like. The image forming apparatus includes a first detecting part, a paper discharging part and a control part. The first detecting part detects the pass of an edge part of the document. The control part determines the length of a document along the direction of conveyance from the time required from the moment when the document reaches the first detecting part to the moment when it pass the first detecting part, determining the sorting destination.

Abstract: Provided is a post-processing device capable of executing sheet post-processing on printed sheets piled on mail boxes with simplicity. The post-processing device includes one or more mail boxes on which printed sheets are to be piled up, a post-processing part for performing specified sheet post-processing on the fed sheets, and a sheet feed part capable of feeding the sheets piled on the one or more mail boxes, respectively, to the post-processing part.

Abstract: Optical scanning device includes as follows. Light emitting element emits light beam in First direction and Second direction. Mirror unit reflects light beam emitted in First direction. First light receiving element receives light beam reflected by Mirror unit. Reference signal generator generates BD signal based on signal output from First light receiving element. Second light receiving element receives light beam emitted in Second direction. Light quantity controller measures signal output from Second light receiving element and automatically controls the light quantity of light beam emitted during APC period. Light quantity controller starts the automatic control at a timing at which light beam reflected by Mirror unit passes through the position of Second light receiving element and is received by First light receiving element and completes the automatic control before light beam reflected by Mirror unit reaches the position of Second light receiving element next.

Abstract: Optical scanning device includes as follows. Light emitting element emits light beam in First direction and Second direction. Mirror unit reflects light beam emitted in First direction. First light receiving element receives light beam reflected by Mirror unit. Reference signal generator generates BD signal based on signal output from First light receiving element. Second light receiving element receives light beam emitted in Second direction. Light quantity controller measures signal output from Second light receiving element and automatically controls the light quantity of light beam emitted during APC period. Light quantity controller starts the automatic control at a timing at which light beam reflected by Mirror unit passes through the position of Second light receiving element and is received by First light receiving element and completes the automatic control before light beam reflected by Mirror unit reaches the position of Second light receiving element next.

Abstract: A paper-feeding apparatus includes a double paper feed prevention mechanism including a conveyance roller rotating forward in a paper feeding direction, and a handling roller rotating rearward in an opposite direction to the paper feeding direction through a torque limiter and being driven by the conveyance roller when the number of fed sheets of paper is one, a double paper feed detection sensor disposed at a downstream side of the double paper feed prevention mechanism to detect a physical quantity corresponding to the number of fed sheets of paper, and a control unit that determines a frequency of double paper feed events at the downstream side of the double paper feed prevention mechanism based on an output signal of the double paper feed detection sensor, and controls a speed of rearward rotation of the handling roller depending on the frequency of the double paper feed events.