Abstract: The image forming system comprises an accessory device and an image forming apparatus, the accessory device for storing device identification information for identifying its own device, and the image forming apparatus to which the accessory device is connected. The image forming apparatus stores the device identification information of the accessory device included in the image forming system. Further, the image forming apparatus receives a participation notification which requires participating in the image forming system from a new accessory device including the device identification information. If the device identification information included in the received participation notification is not stored, the image forming apparatus stores the information. If already stored, the image forming apparatus discards the participation notification.

Abstract: An image forming system capable of properly managing maintenance information on a punch die mounted on a puncher. The puncher punches holes in a sheet using a removably mounted punch die. A punch die memory mounted on the punch die stores maintenance information concerning the punch die. A CPU of the image forming system detects mounting of a punch die. A RAM of the same stores maintenance information concerning each of punch dies mounted on the puncher. When a punch die is mounted on the puncher, the CPU performs comparison between maintenance information is stored in the RAM, and maintenance information stored in the punch die memory, and when the maintenance information stored in the RAM is older, the CPU updates the information in the RAM to the information in the punch die memory.

Abstract: An image reading apparatus includes: a first size-detecting portion which detects a size of an original disposed on a disposing portion; a conveying portion which conveys the original disposed on the disposing portion to a reading portion, a second size-detecting portion which detects the size of the original to be conveyed by the conveying portion; a controller which calculates an overlap region between a reading region and an original region, with the reading region determined based on a reading size obtained by a obtain portion and the detection of the first size-detecting portion, and the original region determined by the second size-detecting portion; and a notifying portion which makes a predetermined notification based on the information that has been calculated.

Abstract: A punching apparatus capable of performing update work for updating maintenance information, irrespective of whether or not a punch die is mounted. A puncher includes a punching unit that punches a sheet using an exchangeable punch die provided with a die memory, and a CPU that detects mounting of a punch die in the punching unit. The CPU receives an update request requesting update of maintenance information stored in the die memory of the punch die. If mounting of the punch die is detected, when the update request designating the punch die is received, the CPU updates the maintenance information of the punch die based on the update request. If mounting of the punch die is not detected, the CPU updates the maintenance information of the punch die when mounting of the punch die is detected.

Abstract: An image forming system capable of properly managing maintenance information on a punch die mounted on a puncher. The puncher punches holes in a sheet using a removably mounted punch die. A punch die memory mounted on the punch die stores maintenance information concerning the punch die. A CPU of the image forming system detects mounting of a punch die. A RAM of the same stores maintenance information concerning each of punch dies mounted on the puncher. When a punch die is mounted on the puncher, the CPU performs comparison between maintenance information is stored in the RAM, and maintenance information stored in the punch die memory, and when the maintenance information stored in the RAM is older, the CPU updates the information in the RAM to the information in the punch die memory.

Abstract: A sheet processing apparatus capable of discharging even a lateral displacement uncorrectable sheet onto a discharge tray without collision with an alignment plate. A finisher conveys a sheet along a conveying path. A shift unit corrects a lateral displacement of the sheet based on a result of detection by a lateral displacement detection sensor. Sheets discharged via the conveying path are stacked on a discharge tray. A pair of alignment plates disposed above the stacking tray are lowered and are moved between a standby position and an alignment position to be brought into abutment with respective opposite edges of the discharged sheet in the alignment position. A finisher controller makes a distance between the alignment plates in a standby position different according to a sheet type, even when a size of the sheet in the width direction is the same.

Abstract: An image forming system capable of properly managing maintenance information on a punch die mounted on a puncher. The puncher punches holes in a sheet using a removably mounted punch die. A punch die memory mounted on the punch die stores maintenance information concerning the punch die. A CPU of the image forming system detects mounting of a punch die. A RAM of the same stores maintenance information concerning each of punch dies mounted on the puncher. When a punch die is mounted on the puncher, the CPU performs comparison between maintenance information is stored in the RAM, and maintenance information stored in the punch die memory, and when the maintenance information stored in the RAM is older, the CPU updates the information in the RAM to the information in the punch die memory.

Abstract: An image forming system capable of producing a center-folded or saddle-stitched brochure having punched holes at identical positions between the front and back sides thereof even when a saddle-stitching or center-folding position is set to a location shifted from a sheet center position. A puncher punches holes in a sheet. A finisher folds a sheet bundle formed by sheets each having the holes punched therein. A console sets an adjustment value for adjusting a folding position at which the sheet bundle is folded by the finisher, according to a manual operation. When the adjustment value is larger than a reference value, the puncher determines a punching position with respect to a folding position having the adjustment value reflected thereon and punches the holes in the determined punching position.

Abstract: An image forming system capable of properly managing maintenance information on a punch die mounted on a puncher. The puncher punches holes in a sheet using a removably mounted punch die. A punch die memory mounted on the punch die stores maintenance information concerning the punch die. A CPU of the image forming system detects mounting of a punch die. A RAM of the same stores maintenance information concerning each of punch dies mounted on the puncher. When a punch die is mounted on the puncher, the CPU performs comparison between maintenance information is stored in the RAM, and maintenance information stored in the punch die memory, and when the maintenance information stored in the RAM is older, the CPU updates the information in the RAM to the information in the punch die memory.

Abstract: An image reading apparatus includes: a first size-detecting portion which detects a size of an original disposed on a disposing portion; a conveying portion which conveys the original disposed on the disposing portion to a reading portion, a second size-detecting portion which detects the size of the original to be conveyed by the conveying portion; a controller which calculates an overlap region between a reading region and an original region, with the reading region determined based on a reading size obtained by a obtain portion and the detection of the first size-detecting portion, and the original region determined by the second size-detecting portion; and a notifying portion which makes a predetermined notification based on the information that has been calculated.

Abstract: A punching apparatus capable of performing update work for updating maintenance information, irrespective of whether or not a punch die is mounted. A puncher includes a punching unit that punches a sheet using an exchangeable punch die provided with a die memory, and a CPU that detects mounting of a punch die in the punching unit. The CPU receives an update request requesting update of maintenance information stored in the die memory of the punch die. If mounting of the punch die is detected, when the update request designating the punch die is received, the CPU updates the maintenance information of the punch die based on the update request. If mounting of the punch die is not detected, the CPU updates the maintenance information of the punch die when mounting of the punch die is detected.

Abstract: A sheet stacking apparatus for performing post-processing on sheets received from an image forming apparatus and discharging the processed sheets. A stacking tray has the received sheets stacked thereon. A CPU controls a tray lifting/lowering motor to drive the stacking tray to be lifted or lowered. The CPU determines a vertically moving state of the stacking tray. When the stacking tray is not lowered though the tray lifting/lowering motor is controlled to lower the stacking tray, the CPU notifies the image forming apparatus that a job should be suspended. After notifying, the CPU controls the tray lifting/lowering motor to lift the stacking tray. Then, when the stacking tray can be lifted, the CPU notifies the image forming apparatus that the job is to be resumed.

Abstract: An image forming system which can recognize the network configuration in real time is provided. The image forming system comprises an image forming apparatus for performing image formation and one or more accessory devices capable of establishing communication with the image forming apparatus via network bus. The image forming apparatus stores identification information which identifies each of the one or more accessory devices. The accessory device detects a communication state of the network bus to notify the image forming apparatus or accessory device which is adjacent of occurrence of communication error not via the network bus. When the occurrence of the communication error of the network bus is notified from the accessory device which is adjacent, the image forming apparatus realizes the network configuration in real time and erases the identification information stored.

Abstract: A sheet processing apparatus capable of discharging even a lateral displacement uncorrectable sheet onto a discharge tray without collision with an alignment plate. A finisher conveys a sheet along a conveying path. A shift unit corrects a lateral displacement of the sheet based on a result of detection by a lateral displacement detection sensor. Sheets discharged via the conveying path are stacked on a discharge tray. A pair of alignment plates disposed above the stacking tray are lowered and are moved between a standby position and an alignment position to be brought into abutment with respective opposite edges of the discharged sheet in the alignment position. A finisher controller makes a distance between the alignment plates in a standby position different according to a sheet type, even when a size of the sheet in the width direction is the same.

Abstract: A sheet processing apparatus capable of determining whether or not a press operation is to be performed on a folded part of a sheet bundle according to the number of sheets of the sheet bundle. If a folding priority mode is not set on a selection screen displayed on a display unit of the sheet processing apparatus, a controller of the sheet processing apparatus determines whether or not the number of sheets of the sheet bundle indicated in sheet bundle information is equal to or larger than a threshold value. The controller sets a press mode in the sheet bundle information to “press,” if the number of sheets of the sheet bundle is equal to or larger than the threshold value, and sets the press mode to “pressless,” if the number of sheets of the sheet bundle is less than the threshold value.

Abstract: An image forming system which can recognize the network configuration in real time is provided. The image forming system comprises an image forming apparatus for performing image formation and one or more accessory devices capable of establishing communication with the image forming apparatus via network bus. The image forming apparatus stores identification information which identifies each of the one or more accessory devices. The accessory device detects a communication state of the network bus to notify the image forming apparatus or accessory device which is adjacent of occurrence of communication error not via the network bus. When the occurrence of the communication error of the network bus is notified from the accessory device which is adjacent, the image forming apparatus realizes the network configuration in real time and erases the identification information stored.

Abstract: The image forming system comprises an accessory device and an image forming apparatus, the accessory device for storing device identification information for identifying its own device, and the image forming apparatus to which the accessory device is connected. The image forming apparatus stores the device identification information of the accessory device included in the image forming system. Further, the image forming apparatus receives a participation notification which requires participating in the image forming system from a new accessory device including the device identification information. If the device identification information included in the received participation notification is not stored, the image forming apparatus stores the information. If already stored, the image forming apparatus discards the participation notification.

Abstract: A sheet stacking apparatus for performing post-processing on sheets received from an image forming apparatus and discharging the processed sheets. A stacking tray has the received sheets stacked thereon. A CPU controls a tray lifting/lowering motor to drive the stacking tray to be lifted or lowered. The CPU determines a vertically moving state of the stacking tray. When the stacking tray is not lowered though the tray lifting/lowering motor is controlled to lower the stacking tray, the CPU notifies the image forming apparatus that a job should be suspended. After notifying, the CPU controls the tray lifting/lowering motor to lift the stacking tray. Then, when the stacking tray can be lifted, the CPU notifies the image forming apparatus that the job is to be resumed.

Abstract: When information about weight of a sheet indicates weight less than a predetermined weight, a sheet stacking apparatus configured to align sheets to be stacked on a stacking tray discharges the sheet onto the stacking tray while overlapping the sheet with another sheet by an overlapping unit, and, when the information about the weight of the sheet indicates weight not less than the predetermined weight, the sheet stacking apparatus discharges the sheet onto the stacking tray without overlapping the sheet with another sheet by the overlapping unit.

Abstract: A sheet processing apparatus capable of determining whether or not a press operation is to be performed on a folded part of a sheet bundle according to the number of sheets of the sheet bundle. If a folding priority mode is not set on a selection screen displayed on a display unit of the sheet processing apparatus, a controller of the sheet processing apparatus determines whether or not the number of sheets of the sheet bundle indicated in sheet bundle information is equal to or larger than a threshold value. The controller sets a press mode in the sheet bundle information to “press,” if the number of sheets of the sheet bundle is equal to or larger than the threshold value, and sets the press mode to “pressless,” if the number of sheets of the sheet bundle is less than the threshold value.