Abstract: An image forming apparatus includes a feeding portion, an image forming portion, a discharge portion, a paper transport path, a plurality of detection members, and a control portion. The image forming portion forms images on sheets of paper fed from the feeding portion. The path transports paper from the feeding portion to the discharge portion via the image forming portion. The detection members detect transport state of paper at respective locations on the path including the feeding portion, between the feeding and image forming portions, within the image forming portion, between the image forming and discharge portions, and the discharge portion. Upon detection of paper jam at any of the locations, the control portion displays, on an indicator, information identifying a location where the jam has occurred, and the image forming portion where paper is detected by the detection members, as locations of paper to be eliminated from the path.

Abstract: A sheet feeder has a feed passage and includes feed roller pairs, sensors, and a controller. The feed roller pairs are arranged along the feed passage and feed sheets of paper in a feed direction along the passage by nipping the sheets. Each of the sensors is fitted at or near one of the feed roller pairs and senses a specified point on each of the sheets when the sheet is nipped by at least the associated roller pair. The controller includes a memory for storing reference feed timings as proper feed timings at each of which the specified points on the sheets should pass one of the sensors. The controller finds the real feed timing when each of the sensors senses the specified point on the sheet nipped by at least the associated roller pair.

Abstract: A paper processing device includes a processing unit, a paper ejection roller, a sorting mechanism, a paper overlapping mechanism, and a control unit. The processing unit performs predetermined processing upon sheets of paper being conveyed one at a time along a paper conveyance direction. The roller discharges the sheets in the paper conveyance direction, after completion of processing by the processing unit. The sorting mechanism shifts the roller to and fro between an initial position and a sorting position in a direction orthogonal to the paper conveyance direction. The overlapping mechanism superimposes, between the processing unit and the roller in the paper conveyance direction, a predetermined number of sheets of paper upon which processing has been completed. The control unit superimposes a predetermined number of sheets of paper by operating the overlapping mechanism, before shifting the roller from the initial position to the sorting position with the sorting mechanism.

Abstract: A sheet feeder has a feed passage and includes feed roller pairs, sensors, and a controller. The feed roller pairs are arranged along the feed passage and feed sheets of paper in a feed direction along the passage by nipping the sheets. Each of the sensors is fitted at or near one of the feed roller pairs and senses a specified point on each of the sheets when the sheet is nipped by at least the associated roller pair. The controller includes a memory for storing reference feed timings as proper feed timings at each of which the specified points on the sheets should pass one of the sensors. The controller finds the real feed timing when each of the sensors senses the specified point on the sheet nipped by at least the associated roller pair.

Abstract: A paper processing device includes a processing unit, a paper ejection roller, a sorting mechanism, a paper overlapping mechanism, and a control unit. The processing unit performs predetermined processing upon sheets of paper being conveyed one at a time along a paper conveyance direction. The roller discharges the sheets in the paper conveyance direction, after completion of processing by the processing unit. The sorting mechanism shifts the roller to and fro between an initial position and a sorting position in a direction orthogonal to the paper conveyance direction. The overlapping mechanism superimposes, between the processing unit and the roller in the paper conveyance direction, a predetermined number of sheets of paper upon which processing has been completed. The control unit superimposes a predetermined number of sheets of paper by operating the overlapping mechanism, before shifting the roller from the initial position to the sorting position with the sorting mechanism.

Abstract: An image forming apparatus includes a feeding portion, an image forming portion, a discharge portion, a paper transport path, a plurality of detection members, and a control portion. The image forming portion forms images on sheets of paper fed from the feeding portion. The path transports paper from the feeding portion to the discharge portion via the image forming portion. The detection members detect transport state of paper at respective locations on the path including the feeding portion, between the feeding and image forming portions, within the image forming portion, between the image forming and discharge portions, and the discharge portion. Upon detection of paper jam at any of the locations, the control portion displays, on an indicator, information identifying a location where the jam has occurred, and the image forming portion where paper is detected by the detection members, as locations of paper to be eliminated from the path.

Abstract: An image recording apparatus which is capable of recording an image by forming a dot for each pixel includes an interface (14) for receiving dot data having 300 dpi dot density, converting unit (15, 16, 17, 18) connected to the interface for converting the received data into dot data having 600 dpi dot density by replacing a dot of a focus pixel with a plurality of dots having patterns corresponding to dot patterns of areas containing the focus pixel, and a base engine unit (13) connected to the converting unit for forming an image in accordance with the converted dot data.