A card reader comprises a mouth region for receiving a card having stored data to be read and a data reader region for reading the stored data. The reader is arranged to deliver a card received at the mouth region to the data reader region via a delivery path. The delivery path is arranged to maintain the card in a predetermined plane during transportation. A signal source is arranged to produce an output signal which is projected across the delivery path in the plane which a card passes when in use. A detector is also arranged to receive the output signal and to detect the presence of an object in the delivery path in response to the object interfering with the output signal.
1. A card reader comprising a card receiving means for receiving a card having stored data to be read and card reading means for reading the stored data, the reader being arranged to deliver the card received at the card receiving means to the card reading means via a delivery path, the delivery path being arranged to maintain the card in a predetermined plane during transportation, a signal source for providing an output signal which is projected across the delivery path in the plane which the card passes when in use, and a detector arranged to receive the output signal and to detect the presence of an object in the delivery path in response to the object interfering with the output signal, wherein optical fibres are arranged to bring the output signal from the signal source to one side of the delivery path for projection across the delivery path.
2. A card reader according to claim 1 , wherein the output signal from the signal source comprises first and second beams arranged to detect the presence of the object at two distinct points along the delivery path.
3. A card reader according to claim 2 , wherein the first beam is located within the interior of the reader and the second beam is located outside of the interior of the reader.
4. A card reader according to claim 3 , wherein both the first and second beams are located adjacent a shutter.
5. A card reader according to claim 2 , further comprising an encoding system arranged to provide the beam or beams with a unique signature.
6. A card reader according to claim 1 , wherein the signal source and the detector are located on the same side of the delivery path, and a reflector is employed to reflect the signal from the signal source for receipt by the detector.
7. A card reader according to claim 1 , wherein the signal source and the detector comprise appropriately matched electro-optic devices.
8. A card reader comprising a card receiving means for receiving a card having stored data to be read and card reading means for reading the stored data, the reader being arranged to deliver the card received at the card receiving means to the card reading means via a delivery path, the delivery path being arranged to maintain the card in a predetermined plane during transportation, a signal source for providing an output signal which is projected across the delivery path in the plane which the card passes when in use, and a detector arranged to receive the output signal and to detect the presence of an object in the delivery path in response to the object interfering with the output signal, wherein optical fibres are arranged at a side of the delivery path to receive the output signal having crossed the delivery path and to transmit the received output signal to the detector.
9. A card reader according to claim 8 , wherein the output signal from the signal source comprises first and second beams arranged to detect the presence of the object at two distinct points along the delivery path.
10. A card reader according to claim 9 , wherein the first beam is located within the interior of the reader and the second beam is located outside of the interior of the reader.
11. A card reader according to claim 10 , wherein both the first and second beams are located adjacent a shutter.
12. A card reader according to claim 9 , further comprising an encoding system arranged to provide the beam or beams with a unique signature.
13. A card reader according to claim 8 , wherein the signal source and the detector are located on the same side of the delivery path, and a reflector is employed to reflect the signal from the signal source for receipt by the detector.
14. A card reader according to claim 8 , wherein the signal source and the detector comprise appropriately matched electro-optic devices.