Abstract: A document feeding device has: a document placement stand on which documents of different sizes can be placed; a conveying section separating, one-by-one, documents of a document stack placed on the document placement stand, and conveying a separated document to a discharging section; a first document width sensing unit sensing a maximum document width of the document stack placed on the document placement stand; a second document width sensing unit sensing a document width of a document separated from the document placement stand by the conveying section; and a controller that, in a case in which a mixed size document mode that permits conveying of documents of different sizes is not set, causes the conveying section to restartably interrupt conveying of the document when the maximum document width sensed by the first document width sensing unit and the document width sensed by the second document width sensing unit differ.

Abstract: A medium feed device includes a suction member that sucks a medium on a stack member, a surrounding member supported movably in directions toward and away from the stack member together with the medium by suction, a stack-member moving mechanism, a suction-member moving mechanism, a transport member that transports the medium, a detected part associated with the surrounding member, a detecting part that is supported at the suction-member body and detects the detected part, a detector that detects a medium surface position based on a detection result of the detected part detected by the detecting part if the surrounding member moves toward the suction-member body from a state in which the medium contacts the surrounding member. The stack-member moving mechanism moves the stack member based on the medium surface position.

Abstract: A medium feed device includes a suction member that sucks a medium on a stack member; a surrounding member supported movably in directions toward and away from the stack member together with the medium by suction; a stack-member moving mechanism; a suction-member moving mechanism; a transport member that transports the medium; a detected part associated with the surrounding member; a detecting part that is supported at the suction-member body and detects the detected part; a detector that detects a medium surface position based on a detection result of the detected part detected by the detecting part if the surrounding member moves toward the suction-member body from a state in which the medium contacts the surrounding member. The stack-member moving mechanism moves the stack member based on the medium surface position.

Abstract: A replaceable unit includes a feeding roller that feeds a sheet from a sheet accommodation portion that accommodates the sheet; a conveyance roller that conveys the sheet fed by the feeding roller downstream; a first frame body that supports the feeding roller and the conveyance roller so as to be rotatable; and a second frame body that supports the first frame body so as to be movable and is removably mounted at a position at which the feeding roller can touch against the sheet accommodated at the sheet accommodation portion.

Abstract: An automatic original feeding device includes an original paper feed tray that loads an original to read the image, the original paper feed tray being supported on an upper face of a platen glass for an image reader that reads an image of the original passing through an original reading position set along a straight line on the upper face of the platen glass disposed at an upper end; an original paper output tray, original feeding members feeding sequentially the original laid on the original paper feed tray to the original reading position and the original paper output tray and a strip sheet attaching part attaching detachably a strip colored sheet, the strip sheet attaching part provided in a back platen member disposed in a portion opposed to the original reading position under the condition that the sheet attaching part is supported on the upper face of the platen glass.

Abstract: The sheet transport apparatus comprise a sheet supply tray, a separation roll, a support body and a separation roll accommodation portion. The sheet supply tray has a plurality of sheets. The separation roll separates out the sheets one by one by applying a transport resistance to the sheets transported from the sheet supply tray. The support body rotatably supports the separation roll. The separation roll accommodation portion is formed in a transport path along which the sheets are transported, and it accommodates the separation roll and the support body such that they may be detached from a transport surface side of the transport path.

Abstract: A document transport device includes a transport unit that transports documents one by one to a position where an image is read by an image reading unit and transports the document at a speed at which the image reading unit can read the image at the image reading position, and a controller that determines, based on an instruction from an image forming apparatus to which the document transport device is mounted, the number of sheets transported per unit time when plural documents are transported by the transport unit, and controls the transport unit to transport the documents at the determined number of sheets transported per unit time.

Abstract: The sheet transport apparatus comprise a sheet supply tray, a separation roll, a support body and a separation roll accommodation portion. The sheet supply tray has a plurality of sheets. The separation roll separates out the sheets one by one by applying a transport resistance to the sheets transported from the sheet supply tray. The support body rotatably supports the separation roll. The separation roll accommodation portion is formed in a transport path along which the sheets are transported, and it accommodates the separation roll and the support body such that they may be detached from a transport surface side of the transport path.

Abstract: A document feeding device has: a document placement stand on which documents of different sizes can be placed; a conveying section separating, one-by-one, documents of a document stack placed on the document placement stand, and conveying a separated document to a discharging section; a first document width sensing unit sensing a maximum document width of the document stack placed on the document placement stand; a second document width sensing unit sensing a document width of a document separated from the document placement stand by the conveying section; and a controller that, in a case in which a mixed size document mode that permits conveying of documents of different sizes is not set, causes the conveying section to restartably interrupt conveying of the document when the maximum document width sensed by the first document width sensing unit and the document width sensed by the second document width sensing unit differ.

Abstract: A replaceable unit includes a feeding roller that feeds a sheet from a sheet accommodation portion that accommodates the sheet; a conveyance roller that conveys the sheet fed by the feeding roller downstream; a first frame body that supports the feeding roller and the conveyance roller so as to be rotatable; and a second frame body that supports the first frame body so as to be movable and is removably mounted at a position at which the feeding roller can touch against the sheet accommodated at the sheet accommodation portion.

Abstract: A document transport device includes a transport unit that transports documents one by one to a position where an image is read by an image reading unit and transports the document at a speed at which the image reading unit can read the image at the image reading position, and a controller that determines, based on an instruction from an image forming apparatus to which the document transport device is mounted, the number of sheets transported per unit time when plural documents are transported by the transport unit, and controls the transport unit to transport the documents at the determined number of sheets transported per unit time.

Abstract: An automatic original feeding device includes an original paper feed tray that loads an original to read the image, the original paper feed tray being supported on an upper face of a platen glass for an image reader that reads an image of the original passing through an original reading position set along a straight line on the upper face of the platen glass disposed at an upper end; an original paper output tray, original feeding members feeding sequentially the original laid on the original paper feed tray to the original reading position and the original paper output tray and a strip sheet attaching part attaching detachably a strip colored sheet, the strip sheet attaching part provided in a back platen member disposed in a portion opposed to the original reading position under the condition that the sheet attaching part is supported on the upper face of the platen glass.

Abstract: An image forming apparatus management system for setting various parameters of the image forming apparatus according to a job instruction from the client machine 2 comprises a host server 4 equipped with an external database 5 for storing various parameters of the image forming apparatus 1 corresponding to the predetermined job conditions, said host server retrieving various parameters satisfying the job conditions from the external database 5 according to the external parameter request and delivering the parameters, and a client server 3 connected to said host server 4 in a bidirectionally communicable way, said client server associated with communications between said client machine 2 and the image forming apparatus 1 and making an external parameter request to the host server 4 as well as supplying various parameters delivered from the host server 4 to the image forming apparatus 1.

Abstract: An image forming apparatus management system for setting various parameters of the image forming apparatus according to a job instruction from the client machine 2 comprises a host server 4 equipped with an external database 5 for storing various parameters of the image forming apparatus 1 corresponding to the predetermined job conditions, said host server retrieving various parameters satisfying the job conditions from the external database 5 according to the external parameter request and delivering the parameters, and a client server 3 connected to said host server 4 in a bidirectionally communicable way, said client server associated with communications between said client machine 2 and the image forming apparatus 1 and making an external parameter request to the host server 4 as well as supplying various parameters delivered from the host server 4 to the image forming apparatus 1.

Abstract: A curl correcting unit in which plural curl correcting sections are sequentially arranged in a sheet transporting direction enhances curl correction in a direction to lower edge portions of a sheet. The curl correcting unit which performs curl correction on a sheet on which an image is formed by an image forming apparatus, has a first curl correcting device for applying pressure to the sheet and performing curl correction in a direction to raise the edge portions of the sheet, and a second curl correcting device for applying pressure to the sheet and performing curl correction in a direction to lower the edge portions of the sheet, the second curl correcting device being positioned downstream of a sheet transporting path with respect to the first curl correcting device, the pressure of the second curl correcting device being applied to the sheet at all times during at least transportation of the sheet.

Abstract: An image formation apparatus for transferring an image of an original document to a copy paper sheet. Original documents are placed in an original document tray and copy paper sheets are stored in a paper tray. The original document tray has a tray sensor for sensing the original document placed on the original document tray. Upon transferring the original documents to an image scanning apparatus, a regi-sensor measures the length of the original document when the original document is transported to the scanning apparatus. A value corresponding to a transport distance is stored until the original document leaves the tray sensor based on the length of the original document. The tray sensor can sense when the original document is transported more than the transport distance corresponding to the value stored. Paper is fed out of the copy paper sheet tray to the image transfer apparatus when the controller senses the original document.