| 摘要 |
A method and device for detecting and counting articles released by a feeder device, in particular sheet articles released by a sheet feeder are described. The device comprises: an electromagnetic resonator (11) fed by a signal generator (12), to generate an electromagnetic field in a passage region (9) of said sheet articles (3); a sensor (13) connected to the electromagnetic resonator (11) for detecting the induced disturbances in the electromagnetic field following the passage of one or more superimposed sheet articles (3); and a control unit (14) connected to the sensor (13) for calculating the number of sheet articles (3), which pass from time to time across the passage region (9). In particular, the electromagnetic resonator (11) is of recess type and in it an aperture (7) is made which makes said recess (8) communicating with the outside; whereby the resonator (11) is arranged so that the aperture (7) is disposed at the passage region (9). The method comprises the steps of: intermittently releasing sheet articles by the feeder (10); conveying the sheet articles (3) across the passage region (9); detecting the disturbances induced in the electromagnetic field after the passage of one or more superimposed sheet articles (3); calculating the number of sheet articles (3) which pass from time to time across the passage region (9) according to the measurements carried out in the preceding step. |
