Recording medium transport device and image forming device

Abstract

The invention discloses a recording medium conveying device. It includes a transport path, a transport unit, a recording medium detection sensor, a medium gap calculation unit, a control unit, and a difference calculation unit. The difference calculation unit uses the paper gap based on the output of the recording medium detection sensor as a reference sensor as a reference value, and calculates the reference value for a predetermined period by subtracting the paper gap calculated based on the output of another recording medium detection sensor by the medium gap calculation unit. The resulting difference in the medium interval. When the value obtained by subtracting the difference calculated by the difference calculation unit from the medium interval based on the output of the reference sensor during continuous transport of the recording medium is equal to or less than zero, the control unit causes the transport unit to expand each recording medium. The media interval for the media. As a result, useless control can be eliminated, and the speed of continuously conveying the recording paper can be increased without reducing the accuracy of detecting the paper gap between the recording paper sheets that are continuously conveyed.

Description

technical field [0001] The present invention relates to a recording medium conveying device and an image forming device, and in particular to a technique for continuously conveying a plurality of recording media during continuous printing. Background technique [0002] There is known an image forming apparatus that continuously conveys a plurality of sheets of recording paper to an image forming unit to perform continuous printing. In such an image forming apparatus, in order to carry out conveyance control such that the interval between recording sheets in the conveyance direction of the recording paper (hereinafter referred to as the paper interval) is kept constant, there are devices arranged on the conveyance path for conveying the recording paper. A plurality of recording paper detection sensors at different positions in the direction. Each recording paper detection sensor outputs a detection signal indicating the presence or absence of recording paper at the respectiv...

AI Technical Summary

Problems solved by technology

In this case, although it is actually possible to convey the recording paper within a shorter paper interval after obtaining correct detection signals from each recording paper detection sensor, if the paper interval becomes below the above-mentioned predetermined interval, the control unit will drive Control, to expand the paper interval on the conveying part to a predetermined interval, not only forms useless control, but also becomes the main factor that reduces the recording paper conveying speed during continuous printing, etc. in order to set a large paper interval

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