We claim:
1. A device for transferring a sheet via a peripheral region of a cylinder, comprising an airflow-generating device for applying at least one air flow to the peripheral region of the cylinder, with which the sheet is associated, said airflow being directed in a direction of rotation of the cylinder.
2. The transfer device according to claim 1, wherein said airflow has a speed which is at most as great as the speed of the sheet.
3. The transfer device according to claim 1, wherein said airflow is inclined with respect to an imaginary tangent to the periphery of the cylinder at an angle 0 <90, said tangent intersecting a point of impingement of a central flow line of said airflow.
4. The transfer device according to claim 1, wherein said airflow-generating device serves for producing one of compressed air and blast air.
5. The transfer device according to claim 1, wherein said airflow-generating device is assigned to an air guide device for aligning said airflow.
6. The transfer device according to claim 5, wherein said air guide device has at least one blast box formed with at least one air outlet opening.
7. The transfer device according to claim 5, wherein said air guide device has at least one blast tube formed with at least one air outlet opening.
8. The transfer device according to claim 5, wherein said air guide device has at least one blast box and at least one blast tube, respectively, formed with at least one air outlet opening.
9. The transfer device according to claim 1, wherein the cylinder is formed of a storage drum of a reversing or turning device of a sheet-fed rotary printing machine.
10. The transfer device according to claim 9, wherein said storage drum has at least one holding device for the sheets.
11. The transfer device according to claim 9, wherein said storage drum has a first holding device for a leading edge of the respective sheets, and a second holding device for a trailing edge of the respective sheets.
12. A method of transferring a sheet via a peripheral region of a first cylinder, and of feeding the sheet in an exact position to a second cylinder disposed downline of the first cylinder, wherein at least one airflow is directed onto the sheet lying on a peripheral region of the cylinder, which comprises directing the airflow in the direction of rotation of the cylinder.
13. The method according to claim 12, which includes directing the airflow onto the sheet from a transfer device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A piezoelectric transducer device, comprising:
a receive signal path;
a transistor;
a piezoelectric transducer connected to a first terminal of the transistor;
a switch connected to a second terminal of the transistor, wherein the switch is adapted to selectively connect the second terminal of the transistor to a transmit signal or to a bias voltage; and
an output connected to a third terminal of the transistor, and adapted to receive a signal from the transducer when the switch is connected to the bias voltage, wherein the switch is not in the receive signal path.
2. A transducer device as claimed in claim 1, wherein the transistor is a field effect transistor (FET), the first terminal is a source, the second terminal is a gate and the third terminal is a drain.
3. A transducer device as claimed in claim 2, wherein the transistor is a metal oxide semiconductor field effect transistor (MOSFET).
4. A transducer device as claimed in claim 1, wherein the transistor is a bipolar transistor.
5. A transducer device as claimed in claim 1, wherein the switch is one of: an optocoupler; a field effect transistor; or an electromechanical switch.
6. A transducer device as claimed in claim 1, wherein the piezoelectric transducer is a film bulk acoustic resonator (FBAR) transducer.
7. A sensor, comprising:
piezoelectric transducer device, comprising: a transistor; a piezoelectric transducer connected to a first terminal of the transistor; a switch connected to a second terminal of the transistor, wherein the switch is adapted to selectively connect the second terminal of the transistor to a transmit signal or to a bias voltage; and an output connected to a third terminal of the transistor, and adapted to receive a signal from the transducer when the switch is connected to the bias voltage.
8. A sensor as claimed in claim 7, wherein the transistor is a field effect transistor (FET), the first terminal is a source, the second terminal is a gate and the third terminal is a drain.
9. A sensor as claimed in claim 8, wherein the transistor is a metal oxide semiconductor field effect transistor (MOSFET).
10. A sensor as claimed in claim 7, wherein the transistor is a bipolar transistor.
11. A sensor as claimed in claim 7, wherein the switch is one of: an optocoupler; a field effect transistor; or an electromechanical switch.