Apparatus for detecting objects
First Claim
1. An apparatus for detecting objects each of which is composed of a label applied to carrier, the apparatus comprising:
- a transmitter for emitting ultrasonic waves;
a receiver for receiving ultrasonic waves spaced apart from the transmitter so that the objects can be passed between the transmitter and the receiver, the receiver producing an output signal representing an attenuation of ultrasonic waves when one of the objects is between the transmitter and receiver;
means for comparing the receiver output signal with a threshold value in order to detect the label; and
balancing means for automatically determining the threshold value as a function of the receiver output signal registered during a balancing procedure when a segment including at least one of the carrier material and the label is located between the transmitter and the receiver.
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Accused Products
Abstract
An apparatus for detecting labels on a carrier material has a transmitter that emits ultrasonic waves and a receiver that receives ultrasonic waves. The carrier material is located, with the labels, between the transmitter and the receiver. For detecting the labels, the received signal is compared to a threshold value at the output of the receiver. The threshold value is determined automatically, as a function of the received signal registered during a balancing procedure when the carrier material and/or labels are located between the transmitter and the receiver. In an alternative embodiment of the invention, the apparatus is used to distinguish between single and multiple sheets.
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Citations
27 Claims
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1. An apparatus for detecting objects each of which is composed of a label applied to carrier, the apparatus comprising:
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a transmitter for emitting ultrasonic waves;
a receiver for receiving ultrasonic waves spaced apart from the transmitter so that the objects can be passed between the transmitter and the receiver, the receiver producing an output signal representing an attenuation of ultrasonic waves when one of the objects is between the transmitter and receiver;
means for comparing the receiver output signal with a threshold value in order to detect the label; and
balancing means for automatically determining the threshold value as a function of the receiver output signal registered during a balancing procedure when a segment including at least one of the carrier material and the label is located between the transmitter and the receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus for detecting sheets and to distinguish between single and multiple sheets, the apparatus comprising:
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a transmitter for emitting ultrasonic waves;
a receiver for receiving ultrasonic waves spaced apart from the transmitter so that sheets can be passed between the transmitter and the receiver, the receiver producing an output signal representing an attenuation of ultrasonic waves when one or more sheets is between the transmitter and receiver;
means for comparing the receiver output signal with a threshold value in order to distinguish between single and multiple sheets; and
balancing means for automatically determining the threshold value as a function of the receiver output signal registered during a balancing procedure when at least one of the sheets is located between the transmitter and the receiver. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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Specification