SHEET CONVEYING ABNORMALITY DETECTING METHOD

PURPOSE:To detect conveying abnormality without using a sensor by mounting a diode on each of the drive circuits of motors for rollers to convey a sheet in a way that the rollers are alternately the drive side and the follower side, and comparing a voltage between the diode on the follower side and...

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Bibliographic Details
Main Authors OGATA HIDEICHIRO, OTAKI NOBORU
Format Patent
LanguageEnglish
Published 16.10.1991
Subjects
CONVEYING
HANDLING THIN OR FILAMENTARY MATERIAL
HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS,CABLES
PACKING
PERFORMING OPERATIONS
STORING
TRANSPORTING
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Summary:PURPOSE:To detect conveying abnormality without using a sensor by mounting a diode on each of the drive circuits of motors for rollers to convey a sheet in a way that the rollers are alternately the drive side and the follower side, and comparing a voltage between the diode on the follower side and a motor coil with a reference voltage. CONSTITUTION:A sheet 1 is conveyed through alternative drive of rollers 3 and 5 through the medium of guide rollers 2 and 4. When the roller 3 drives, the roller 4 is driven, and the rollers 3,4 are alternately drive or driven side. A diode 13 is mounted on a drive control circuit 10 for each of the motors 7 and 8. When the motor 8 is on the follower side, motor drivers 10b are all brought into an OFF-state, and a generated back electromotive current I0 flows through the diode 13 to a power source (d) after the flow of it through an earth point (a). The waveform of a voltage at a point (b) is changed when the conveying speed of the sheet 1 is disturbed, and the voltage is compared with a reference voltage by a comparator 14 and it is decided that conveying abnormality occurs. Thus, easy monitoring is carried out without using a sensor.
Bibliography:Application Number: JP19900024429