1-13. (canceled)
14. A device for conveying a flat substrate, such as a sheet or a web comprising:
a transport roll for conveying a flat substrate to be transported, the transport roll having a transport surface in contact with the flat substrate during the transport and provided with a plurality of recesses;
a vacuum device creating a depression in the plurality of recesses; and
a device for cleaning the transport surface.
15. The conveying device according to claim 14, wherein the cleaning device includes an application device applying cleaning liquid on the transport surface.
16. The conveying device according to claim 15, wherein the cleaning device comprises a tank containing cleaning liquid, and a duct adapted to convey the cleaning liquid to the application device.
17. The conveying device according to claim 16, wherein the cleaning liquid is ink repellant liquid.
18. The conveying device according to claim 16, wherein the cleaning liquid is a washing liquid, and the cleaning device includes a wiping device to remove the washing liquid from the transport surface.
19. The conveying device according to claim 18, wherein the wiping device is arranged downstream of the device applying the washing liquid, in the driving direction of the transport roll.
20. The conveying device according to claim 14, wherein the conveying device defines a depression chamber extending over a first angular range around the axis of rotation of the transport roll, the first angular range extending over less than 360\xb0, the vacuum device being connected to the depression chamber to create a depression in the recesses found exclusively in the first angular range, the conveying device defining an ambient chamber extending over a second angular range, recesses found in the second angular range being subject to the ambient pressure, and the cleaning device cooperating with the transport surface within the second angular range.
21. The conveying device according to claim 20, wherein the conveying device defines an overpressure chamber extending over a third angular range around the axis of rotation, the conveying device including an overpressure device connected to the overpressure chamber and to create an overpressure in the recesses found exclusively within the third angular range.
22. The conveying device according claim 14, wherein the transport roll is either an entrance roll, an impression cylinder, a transfer roll or a braking roll.
23. A device for cutting a web into sheets comprising:
a cutting cylinder having a blade;
an impression cylinder cooperating with the cutting cylinder, the cutting cylinder and impression cylinder cutting a flat substrate web into sheets; and
a first device for conveying cut sheets by the cutting and impression cylinders,
wherein the first conveying device is a device according to claim 14.
24. A device for cutting a web into sheets comprising:
a cutting cylinder having a blade;
an impression cylinder cooperating with the cutting cylinder, the cutting cylinder and impression cylinder cutting a flat substrate web into sheets;
a first device for conveying cut sheets by the cutting and impression cylinders; and
a second device for conveying sheets, positioned downstream of the first device for conveying sheets,
wherein the first conveying device and second conveying devices are devices according to claim 14.
25. A rotary printing press comprising:
an unwinder for a web to be printed;
a unit for printing on the web to be printed; and
a device for cutting the printed web into sheets, the cutting device being a cutting device according to claim 23.
26. A method of a conveying a sheet using the conveying device recited in claim 14, comprising the following steps:
creating a depression in at least part of the plurality of recesses;
providing a sheet to be conveyed;
conveying the sheet on the transport surface; and
cleaning the transport surface using the cleaning device.
27. The conveying device according to claim 17, wherein the ink repellant liquid is an emulsion of silicone and water
28. The conveying device according to claim 18, wherein the washing liquid is an ink solvent.
29. The device for cutting a web into sheets according to claim 23, wherein the first conveying device is a transfer device.
30. The device for cutting a web into sheets according to claim 24, wherein the second conveying device is a braking 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.
What is claimed is:
1. A data regenerator for regenerating a data signal, comprising:
a convertor for converting a received data signal into a binary data signal in dependence on conversion parameters;
an error corrector for correcting errors in the binary data signal based on error correction code contained in the binary data signal to produce a corrected binary data signal; and
a performance monitor for comparing the corrected binary data signal with an uncorrected representation of the binary data signal to determine information about the relative number of logic1s and logic 0s that have been corrected by the error corrector and output a feedback signal representative of said information;
wherein the convertor adjusts at least some of the conversion parameters in dependance on the feedback signal.
2. The data regenerator of claim 1 wherein the adjusted conversion parameters include a slicing level for the received data signal to distinguish between a logic 1 and a logic 0.
3. The data regenerator of claim 2 wherein the adjusted conversion parameters include a sampling phase.
4. The data regenerator of claim 2 wherein the received data signal is an optical data signal transmitted over a fiber path and the converter includes an optoelectrical transducer for converting the received data signal into an electrical data signal.
5. The data regenerator of claim 4 wherein the converter includes an analog to digital convertor for sampling an analog electrical signal output from the optoelectrical transducer in dependence on the slicing level to produce the binary data signal.
6. The data regenerator of claim 5 wherein the analog to digital convertor has a sampling phase that is adjusted in dependence on the feedback signal.
7. The data regenerator of claim 1 wherein the adjusted conversion parameters are adjusted with respect to achieving a threshold balance in the ratio of corrected logic 1s and 0s.
8. The data regenerator of claim 1 wherein the performance monitor includes:
a comparitor for performing a bitwise comparison of the corrected binary data signal and the uncorrected representation of the binary data signal and generating a first signal when the comparitor detects that a logic 1 has been changed to a logic 0 and a second signal when the comparitor detects that a logic 0 has been changed to a logic 1 by the error corrector; and
a duty cycle generator responsive to the first and second signals for generating the feedback signal, the feedback signal being indicative of the ratio of corrected logic 1s to corrected logic 0s for predetermined durations of the data signal.
9. The data regenerator of claim 8 including a descrambler for descrambling the binary data signal output by the convertor to produce an uncorrected binary data signal that is provided to the error corrector, the performance monitor including rescrambling means for rescrambling the uncorrected binary data signal and the corrected binary data signal, the comparator performing the bitwise comparison on the rescrambled data signals.
10. The data regenerated of claim 1 wherein the performance monitor includes counting means for counting a number of logic 1s and a number of logic 0s that have been corrected by the error corrector for a predetermined duration of the binary data signal, and outputting signals representative of the number of corrected logic 1s and corrected logic 0s.
11. A method for regenerating a binary data signal comprising:
converting a received data signal into a binary data signal according to conversion parameters;
detecting and correcting errors in the binary data signal based on detection and correction code included in the binary data signal to produce a corrected binary data signal;
comparing the corrected binary data signal with an uncorrected representation of the binary data signal to determine information about the relative number of logic 1s and 0s that have been corrected; and
adjusting at least one of the conversion parameters in dependence on the determined information.
12. The method of claim 11 wherein the received data signal is an optical data signal, including converting the optical data signal into an analog electrical signal and sampling the analog electrical signal in accordance with a sampling phase to determine, relative to a threshold slicing level, if the samples represent logic 1s or logic 0s, to produce the binary data signal.
13. The method of claim 12 including adjusting the threshold slicing level in dependence on the determined information.
14. The method of claim 13 including adjusting the sampling phase in dependence on the determined information.
15. The method of claim 11 wherein the conversion parameters are adjusted with respect achieving a threshold balance in the ratio of corrected logic 1s and 0s.
16. The method of claim 11 wherein the received data signal includes a plurality of data frames formatted as Optical Transport Units, including a generating a duty cycle wave-form having successive periods, each period being representative of the ratio of corrected logic 1s and 0s in at least one of the data frames.
17. A performance monitoring device for monitoring the performance of a data regenerator that corrects a received data signal based on forward error correction information contained in the received data signal, comprising:
comparison means for receiving a corrected binary data signal and an uncorrected binary data signal from the data regenerator and performing a bit-by-bit comparison of the corrected and uncorrected binary data signals to determine when a logic 1 has been corrected to a logic 0 and when a logic 0 has been corrected to a logic 1 by the data regenerator; and
signal generating means responsive to the comparison means for generating an output representative of the relative number of corrected logic 1s and logic 0s.
18. The performance monitoring means of claim 17 wherein the signal generating means generates a duty-cycle waveform representative of the ratio of corrected logic 1s and logic 0s for a data signal of a predetermined length.
19. The performance monitoring means of claim 18 wherein the performance monitoring device includes rescrambler means for rescrambling an unscrambled corrected binary data signal and for rescrambling an unscrambled uncorrected binary data signal and providing the rescrambled signals to the comparison means for said bit-by-bit comparison.
20. The performance monitoring means of claim 17 wherein the signal generating means includes means for counting a number of corrected logic 1s and a number of corrected logic 0s for a data signal of a predetermined length, and outputting signals representative of said number of corrected logic 1s and said number of corrected logic 0s.