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1. 发明专利

JPH03177993A MAGNETIC CARD READER 失效
公开(公告)号：JPH03177993A
公开(公告)日：1991-08-01
申请号：JP31832389
申请日：1989-12-07
申请人： NEWLONG MACHINE WORKS
发明人： WATABE MITSURU , SUZAKI KOICHIRO , SUNADA YUKIO
IPC分类号： G07F7/08 , G06K1/02 , G11B19/02 , G11B23/32
摘要： PURPOSE:To surely detect an abnormal operation even when someone performs an operation to prevent a residual display hole being punched by providing a circuit which judges whether or not a punch performs a normal punching operation based on a current waveform conducted to the coil of an electromagnetic plunger. CONSTITUTION:A resistor 29 to take out a current conducted to the coil 16 as a voltage value is provided, and a taken-out voltage is stored in a capacitor 32 via a rectifier element 31, then, a voltage with peak value is held. Also, the voltage changing from time to time out of the voltages taken out at the resistor 29 is supplied to a voltage comparator 33 via a terminal 33a, and is compared with a peak voltage, and when a voltage difference arrives at a prescribed value, a pulse signal 34 is issued from the voltage comparator 33. The electromagnetic plunger is operated normally while the signal is issued, and it is judged that abnormality occurs in the operation of the electromagnetic plunger when it is not issued. In such a way, the abnormal operation can be surely detected even when the operation to prevent to the residual display hole being punched on a magnetic card is performed by someone.

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