Abstract: A power management apparatus attached to a first image forming apparatus configured to switch a power supply switch to an OFF state, includes an energy storage device configured to supply electric power to the apparatus, a communication interface configured to receive a state of a second image forming apparatus from a communication device attached to the second image forming apparatus, and a mechanical switch configured to physically displace a power supply switch of the first image forming apparatus and turn a power supply of the first image forming apparatus ON and OFF based on the state of the second image forming apparatus.

Abstract: A power management apparatus attached to a first image forming apparatus configured to switch a power supply switch to an OFF state, includes an energy storage device configured to supply electric power to the apparatus, a communication interface configured to receive a state of a second image forming apparatus from a communication device attached to the second image forming apparatus, and a mechanical switch configured to physically displace a power supply switch of the first image forming apparatus and turn a power supply of the first image forming apparatus ON and OFF based on the state of the second image forming apparatus.

Abstract: A printing system, which has a plurality of image forming apparatuses connected to a network and executes a print job with one image forming apparatus among the plurality of the image forming apparatuses, comprises a first image forming apparatus, a job sending section and a second image forming apparatus. The first image forming apparatus cannot carry out a first print job due to setting parameters of the first print job. The job sending section sends the first print job to an image forming apparatus designated via an operation section of the first image forming apparatus. The second image forming apparatus which is the designated image forming apparatus executes the first print job received from the job sending section without receiving an instruction of job execution via its own operation section.

Abstract: A printing management system comprises a count value calculation unit configured to, when a request for printing data of the specific user is received, read out the printing data and calculate a count value based on a number of sheets to fog printed in the printing data, a determination unit configured to determine whether a sum of the calculated count value and a previous cumulative count value is equal to or less than a limit value, and a printing data transmission unit configured to transmit the printing data when the sum is equal or less than the limit value. The count value is the product of the number of sheets to be printed in the printing data and one of a plurality of coefficients, and the one of the plurality of coefficients corresponds to a current one of a plurality of time zones.

Abstract: In the light amount correction in the main scanning direction, sets of correction values of black and cyan for which the reflection frequency of optical elements are equal to an even number of times are made common to each other (a correction value set—KC), and sets of correction values of magenta and yellow for which the reflection frequency of optical elements are equal to an odd number of times are made common to each other (a correction value set—MY), whereby sets of correction values stored in a correction value storage portion in a correction value setting portion are reduced to two sets. Furthermore, in connection with this, the number of DA converters is reduced to two DA converters of a DA converter—K, C and a DA converter—M, Y.

Abstract: In an image forming apparatus of a type wherein toner is replenished to a developing unit by turning or rotating a toner bottle, a phenomenon that a toner replenishment amount per turn of the bottle (replenishing rate) is decreased as the toner remaining quantity in the bottle is decreased, is utilized to provide a method and an apparatus for easily and reliably determining a toner near empty state when a number of the turns measured by counting a number of detection of an object to be sensed formed on an outer surface of the toner bottle.

Abstract: In the light amount correction in the main scanning direction, sets of correction values of black and cyan for which the reflection frequency of optical elements are equal to an even number of times are made common to each other (a correction value set—KC), and sets of correction values of magenta and yellow for which the reflection frequency of optical elements are equal to an odd number of times are made common to each other (a correction value set—MY), whereby sets of correction values stored in a correction value storage portion in a correction value setting portion are reduced to two sets. Furthermore, in connection with this, the number of DA converters is reduced to two DA converters of a DA converter—K, C and a DA converter—M, Y.

Abstract: In an image forming apparatus of a type wherein toner is replenished to a developing unit by turning or rotating a toner bottle, a phenomenon that a toner replenishment amount per turn of the bottle (replenishing rate) is decreased as the toner remaining quantity in the bottle is decreased, is utilized to provide a method and an apparatus for easily and reliably determining a toner near empty state when a number of the turns measured by counting a number of detection of an object to be sensed formed on an outer surface of the toner bottle.

Abstract: An image forming apparatus includes, a first speed decision unit which decides the driving speed of a drive source of a unit for printing, a magnification adjustment unit which adjusts the magnification of image information by changing the speed of the first speed decision unit, a second speed decision unit which decides the driving speed of a drive source of a carry unit to carry a printing medium, and a speed change interlock unit which changes the speed of the second speed decision unit, when the speed of the first speed decision unit is changed by the magnification adjustment unit.

Abstract: An image forming apparatus includes, a first speed decision unit which decides the driving speed of a drive source of a unit for printing, a magnification adjustment unit which adjusts the magnification of image information by changing the speed of the first speed decision unit, a second speed decision unit which decides the driving speed of a drive source of a carry unit to carry a printing medium, and a speed change interlock unit which changes the speed of the second speed decision unit, when the speed of the first speed decision unit is changed by the magnification adjustment unit.

Abstract: A sheet feeding unit is provided with a feeding path, on which a cut sheet serving as an image forming medium having a predetermined size is fed. A sheet edge sensor has sensor elements separately arranged at portions, at which the edge of the cut sheet serving as the image forming medium having the predetermined size can be detected, along a direction perpendicular to the feeding direction of the cut sheet serving as the image forming medium on the feeding path in the sheet feeding unit. An image forming unit forms a predetermined image on the cut sheet serving as the image forming medium to be fed by the sheet feeding unit. An image formation correcting unit corrects image formation according to lateral misalignment of the cut sheet serving as the image forming medium based on a detection result transmitted from the sheet edge sensor when a predetermined image is formed on the cut sheet serving as the image forming medium by the image forming unit.

Abstract: A sheet feeding unit is provided with a feeding path, on which a cut sheet having a predetermined size is fed. A sheet edge sensor has sensor elements separately arranged at portions, at which the edge of the cut sheet can be detected, along a direction perpendicular to the feeding direction of the cut sheet. An image forming unit forms a predetermined image on the cut sheet. An image formation correcting unit corrects image formation according to lateral misalignment of the cut sheet based on a detection result transmitted from the sheet edge sensor when a predetermined image is formed on the cut sheet.