| CPC G03G 15/5029 (2013.01) [G03G 15/55 (2013.01); G03G 15/6588 (2013.01); B65H 2553/30 (2013.01); G03G 2215/00586 (2013.01); G03G 2215/00637 (2013.01); G03G 2215/00742 (2013.01)] | 11 Claims |
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1. An image forming apparatus comprising:
a stack portion on which recording materials are to be stacked;
a feeding unit configured to feed each of the recording materials stacked on the stack portion;
an image forming unit configured to form an image on each recording material of the recording materials fed by the feeding unit;
a transmitter configured to transmit an ultrasonic wave;
a receiver configured to receive the ultrasonic wave transmitted from the transmitter via the recording material and an operating sound generated in the image forming apparatus;
a basis weight detection unit configured to detect a value corresponding to a basis weight of the recording material based on an output from the receiver when the receiver receives the ultrasonic wave;
an operating sound detection unit configured to detect an abnormality of the operating sound based on an output from the receiver when the receiver receives the operating sound; and
a mode selection unit configured to select, for each of the recording materials fed to the image forming unit, between transmitting to the basis weight detection unit a first instruction for detecting the value and transmitting to the operating sound detection unit a second instruction for detecting the abnormality of the operating sound,
wherein, in determining a first interval at which the second instruction is transmitted, the mode selection unit determines the first interval so that the first interval is different from a second interval at which the second instruction is transmitted previously before the first instruction.
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