Recording medium output device and image forming device

Abstract

A drive controlling unit causes an ascending and descending unit to lower a recording medium discharge tray, and then causes raising of the recording medium discharge tray until detection of the upper surface of the recording medium by an upper surface detection sensor. A determining unit determines whether a raising time of the recording medium discharge tray measured by a measuring unit is a predetermined abnormal time. When the raising time is determined by the determining unit not to be the abnormal time, the drive controlling unit causes the recording medium discharge unit to execute the subsequent recording medium discharge into the recording medium discharge tray. When the raising time is determined by the determining unit to be the abnormal time, the drive controlling unit causes the recording medium discharge unit to stop the subsequent recording medium discharge into the recording medium discharge tray.

Description

technical field [0001] The present invention relates to a recording medium output device and an image forming apparatus, and particularly relates to the control of the lifting operation of a stacker when the recording medium is output. Background technique [0002] Conventionally, among image forming apparatuses, there is an image forming apparatus equipped with a recording medium output device that outputs a recording medium after image formation or post-processing such as punching, and the recording medium is output on a tray. The output recording medium is accepted and stacked. In this recording medium output device, if the recording medium stacking state is disturbed during stacking of the recording medium on the recording medium output tray, the recording medium cannot be properly stacked on the recording medium output tray. To this end, the following technology is adopted: when it is detected by the detection sensor that the upper surface of the stacked recording medi...

AI Technical Summary

Problems solved by technology

However, it is impossible to eliminate the following disadvantages: for example, in the recording medium that has fallen into the recording medium output tray and is in the stacked state, the recording medium in the upper part is stacked staggered with other recording media, so that the recording medium stacked in the stacking part Paper jams around the recording medium output port due to the unevenness of the upper surface

[0007] In addition, in the case of prior art 3 described above, when a gap between the recording media is generated at a position deviated from the optical axis between the light emitting unit and the light receiving unit of the sensor for detecting the presence or absence of the recording medium , the position of the recording medium cannot be accurately detected, and the paper jams and other problems that occur around the output port of the recording medium are mainly caused by the difference in height of the upper surface of the stacked recording medium as described above. The techniques shown in technique 3 cannot eliminate

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