Abstract:
Stored in each of four coefficient memories are eight elements of each row of a matrix in 4 rows and 8 columns, which matrix consists of absolute values of elements of upper four rows out of an inverse discrete cosine matrix in 8 rows and 8 columns to be subjected to an 8-point IDCT processing. An input element y.sub.ij is supplied in parallel to four multipliers. Each of the four multipliers executes multiplication of an output of the corresponding coefficient memory out of the four coefficient memories, by the input element y.sub.ij. Eight accumulators are disposed for executing, in parallel, accumulation for obtaining eight inner products using results of the four multipliers while restoring signs of the coefficients of the orthogonal transform matrix. An 8-input selector is disposed for successively selecting results of the eight accumulators to supply an inner product w.sub.ij corresponding to the input element y.sub.ij.
Abstract:
An image forming apparatus to which a developer storage container can be detachably mounted, includes: a reception unit arranged to receive information from the developer storage container; a first temperature detection unit provided in an inside of the image forming apparatus and arranged to detect a temperature of the inside of the image forming apparatus; a cooling unit arranged to cool the inside of the image forming apparatus; and a control unit arranged to determine on the basis of the received information whether second temperature detection unit is provided to the developer storage container, control the cooling unit on the basis of the detection result of the first temperature detection unit when the second temperature detection unit is not provided, and control the cooling unit on the basis of the detection results of the first and second temperature detection units when the second temperature detection unit is provided.
Abstract:
A technique for reducing downtime that accompanies the execution independently of adjustment processing for maintaining image quality and the execution of finishing processing relating to a printing medium. In order to apply the finishing processing to the printing medium in a finishing processing unit, an image forming apparatus to which this technique is applied sets a time between sheets that extends from end of image formation regarding a first sheet of the printing medium to start of image formation regarding a second sheet of the printing medium transported following the first sheet of the printing medium in the image forming unit, and executes adjustment processing, which is for maintaining image quality in the image forming unit, within the set time between sheets.
Abstract:
This invention provides an image forming apparatus capable of shortening the user's print waiting time as much as possible when it is determined that image adjustment is necessary during the image forming operation, and a control method therefor. To accomplish this, in a color image forming apparatus including a plurality of image forming stations which form toner images with a plurality of toners on the basis of a job, it is discriminated whether adjustment processing is necessary during a continuous image forming operation based on the job. If it is discriminated that adjustment processing is necessary, it is determined whether each of the image forming stations has a non-operating time enough to execute the discriminated adjustment processing during the image forming operation. The image forming station determined to have a non-operating time enough to execute adjustment processing executes the discriminated adjustment processing during the non-operating time.
Abstract:
An image forming apparatus capable of efficiently performing an image forming processing even in a case where a post-processing apparatus performs a post-processing during a both-sides printing. A first time period needed by a first both-sides image forming processing and a second time period needed by a second both-sides image forming processing are computed in a case where a post-processing unit performs a post-processing on a recording sheet formed images on both sides thereof. The first time period and the second time period is compared, and any one of the first both-sides image forming processing and the second both-sides image forming processing is selected based on the comparison.
Abstract:
An image forming apparatus which can improve image formation capability to a satisfactory degree while curbing the rise in running cost. An image forming device forms adjustment images having different densities on an image support member having a higher optical reflectivity than an optical reflectivity of the adjustment images. A reading reads the adjustment images. An output from the reading device is read at a predetermined number of readings or time interval between readings based on the densities of the adjustment images susceptible to the optical reflectivity of the image support member.
Abstract:
Disclosed is an image forming apparatus whereby waiting time (downtime), which is required for forming an image by automatic adjustment relating to image formation density or image formation position, is made shorter than in the prior art. When an image having a size equal to or less than a prescribed size is formed is formed in this apparatus, the image to be formed is placed on an image carrier in such a manner that a vacant area for forming an adjustment pattern can be reserved on the image carrier. As a result, automatic adjustment relating to image formation density or image formation position can be executed while an image is formed.
Abstract:
There is provided a punching device including: a die member having a plurality of die holes formed therein; a plurality of punch members which are caused to advance into the die holes to punch holes in a member to be punched; an operating member having cam portions formed along a direction intersecting the direction of advancement of the punch members, the operating member being moved along the direction intersecting the direction of advancement of the punch members to cause by a conversion function of the cam portions the punch members to advance into the die holes; and a drive unit for selectively causing advancement of the plurality of punch members by changing the direction of movement of the operating member. In the punching device, each of the cam portions has a straight groove and a cam groove for performing the conversion function, and when the operating member is moved in one of opposite directions, at least one of the cam grooves of the cam portions acts on one of the punch members to selectively cause the same to advance.
Abstract:
An image forming system that makes it possible to open or remove an external cover of an apparatus to perform maintenance on the apparatus even while the system is operating. Out of a plurality of conveying paths, at least one conveying path for which at least one part related to the conveying path can be subjected to maintenance is determined, in accordance with a type of the image forming process being executed. The conveying path for which it has been determined that the part related to the conveying path can be subjected to maintenance is displayed on a display device.
Abstract:
In an image formation system which includes a finisher with an inserter having a tray for stacking the specific sheet on which an image such as a cover image was formed, and an image formation apparatus, a series of originals composed of plural pages is read from its head page in due order, the image based on the read original is formed on the sheet, the sheet stacked on the inserter is fed, the sheet from the inserter is reversed to set its image-formed face facedown, the sheet from a printer unit is reversed to set its image-formed face facedown. The sheet, the image-formed face of which was reversed facedown, is discharged from the printer unit to the finisher and, on the finisher, the sheet from the inserter is stacked as keeping its image-formed face facedown and the sheet from the printer unit is stacked as keeping its image-formed face facedown. The top and bottom of the image formed by the image forming apparatus corresponds to the top and bottom of the insert sheet.