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AssigneeHeidelberger Druckmaschinen AG
InventorsMarkus Künzel, Tobias Müller, Thomas Wolf
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A method of controlling sheet feed to a sheet-processing machine, wherein sheets are separated from a pile, conveyed onto a table, brought individually into contact with alignment lays for leading edges of the sheets, and conveyed onward therefrom individually for processing in the machine, includes, upon misalignment of a sheet, generating a signal by ultrasonic detectors active in transmission operation, the ultrasonic detectors being fixedly disposed parallel to the alignment lays and including two ultrasonic transmitters arranged at a defined distance, and ultrasonic receivers associated therewith, maintaining over the area of a measuring window sonic energy flux originating from the ultrasonic transmitters, respectively, at a substantially constant sonic intensity in the conveying direction of the sheets, integrally detecting by the respective ultrasonic receiver the sonic energy passing through the measuring window, and simultaneously measuring a difference in the sonic energy measured by the ultrasonic receivers; and a device for performing the method.
A method of controlling sheet feed to a sheet-processing machine, wherein sheets are separated from a pile, conveyed onto a table, brought individually into contact with alignment lays for leading edges of the sheets, and conveyed onward therefrom individually for processing in the machine, which comprises, upon misalignment of a sheet, generating a signal by ultrasonic detectors active in transmission operation, the ultrasonic detectors being fixedly disposed parallel to and upline from the alignment lays and including two ultrasonic transmitters arranged at a defined distance, and ultrasonic receivers associated therewith, maintaining over the area of a measuring window sonic energy flux originating from the ultrasonic transmitters, respectively, at a substantially constant sonic intensity in the conveying direction of the sheets, integrally detecting by the respective ultrasonic receiver the sonic energy passing through the measuring window, and simultaneously measuring a difference in the sonic energy measured by the ultrasonic receivers.
A device for detecting sheets at alignment lays as the sheets are fed to a sheet-processing machine, ultrasonic transmitters and ultrasonic receivers being provided pairwise upline of a line formed by the alignment lays, as viewed in a conveying direction of the sheets, comprising a measuring window assigned to an ultrasonic sensor that includes respective pairs of the ultrasonic transmitters and the ultrasonic receivers, the respective ultrasonic transmitters being capable of radiating sonic energy flux perpendicularly to the conveying direction of the sheet, the sonic energy flux having a constant sonic intensity over the area of the measuring window assigned to the ultrasonic sensor, sonic energy from the sonic energy flux passing through a sheet entering the measuring window, the ultrasonic receivers detecting integrally the sonic energy passing through the measuring window, and further comprising a difference forming device connected to the ultrasonic receivers.
Dependencies are inferred from the claim text.