Paper conveying apparatus, jam detection method, and computer-readable, non-transitory medium

A paper conveying apparatus comprising:

• a sound signal generator, provided with a sound detector near a conveyance path of a paper, for generating sound signals of time series corresponding to a sound generated by the paper during conveyance of the paper;
• a filter for a first frequency band and a filter for a second frequency band which is different from the first frequency band;
• a sound jam detector for determining whether a jam has occurred based on a shape of the sound signals processed by using the filter for a first frequency band;
• a special sound detector for determining whether a special sound has been generated based on the sound signals processed by using the filter for a second frequency band;
• and
• a control module for performing abnormal processing based on the jam detection by the sound jam detector,
• wherein the control module determines that a jam has not occurred and does not perform the abnormal processing when the sound jam detector determined that the jam has occurred and the special sound detector determined that the special sound has been generated.

A computer-readable, non-transitory medium storing a computer program, wherein the computer program causes a computer to perform a process, the process comprising:

• acquiring sound signals of time series corresponding to a sound generated by a paper during conveyance of the paper from a sound signal generator, provided with a sound detector near a conveyance path of a paper, for generating the sound signals;
• determining whether a jam has occurred based on a shape of the sound signals;
• generating a frequency signal by converting the sound signals to frequency components;
• determining whether a special sound has been generated based on a component of a predetermined frequency band of the frequency signal;
• and
• performing abnormal processing based on the jam detection in the jam determining step,
• wherein the computer determines that a jam has not occurred and does not perform the abnormal processing when determining that the jam has occurred in the jam determining step and determining that the special sound has been generated in the special sound determining step, in the performing step.

A computer-readable, non-transitory medium storing a computer program, wherein the computer program causes a computer to perform a process, the process comprising:

• acquiring sound signals of time series corresponding to a sound generated by a paper during conveyance of the paper from a sound signal generator, provided with a sound detector near a conveyance path of a paper, for generating the sound signals;
• determining whether a jam has occurred based on a shape of the sound signals processed by using a filter for a first frequency band;
• determining whether a special sound has been generated based on the sound signals processed by using a filter for a second frequency band which is different from the first frequency band;
• and
• performing abnormal processing based on the jam detection in the jam determining step,
• wherein the computer determines that a jam has not occurred and does not perform the abnormal processing when determining that the jam has occurred in the jam determining step and determining that the special sound has been generated in the special sound determining step, in the performing step.