Method for regulating the vacuum in a suction air installation of a textile machine

• US 5,934,060 A
• Filed: 12/19/1997
• Issued: 08/10/1999
• Est. Priority Date: 12/20/1996
• Status: Expired due to Fees

• Current Assignee: W. Schlafhorst AG & Co. (OC Oerlikon Corporation AG)
• Original Assignee: W. Schlafhorst AG & Co. (OC Oerlikon Corporation AG)
• Inventors: Schmitz, Wilhelm
• Primary Examiner(s): STRYJEWSKI, WILLIAM T
• Application Number:
  US08/994,695
• Time in Patent Office: 599 Days
• Field of Search: 57/304, 57/264, 57/300, 57/305, 15/301, 15/319
• US Class Current: 57/304
• CPC Class Codes: B65H 2701/31 Textiles threads or artificial strands of filaments
• CPC Class Codes: B65H 54/70 Other constructional features of yarn-winding machines
• CPC Class Codes: B65H 54/707 Suction generating system
• CPC Class Codes: B65H 67/081 acting after interruption of the winding process, e.g. yarn breakage, yarn cut or package replacement
• CPC Class Codes: D01H 11/005 with blowing and/or suction devices in general A47L7/00; in cooperation with thread breakage detecting means D01H13/1691

Abstract

For the optimization of the vacuum output of a suction air installation of a textile machine, the vacuum output is adjustably regulated by initially starting a batch with a predetermined vacuum for the vacuum demands under basic operating conditions and additional fluctuating working conditions, counting the errors which cannot be rectified and the attempts to rectify the errors caused by insufficient vacuum during a predetermined time period, subsequently changing the vacuum output of the suction unit during a subsequent time period, comparing the number of errors occurring under the changed vacuum conditions with the number which had occurred in the previous time period, and increasing the vacuum output when the number of errors exceeds a maximum predetermined amount of errors and decreasing the vacuum output when the number of errors is at or less than the maximum predetermined amount of errors.

Claims

1. A method for regulating the vacuum in a suction air installation comprising a suction unit at a textile machine with a plurality of work stations which make various demands on suction air, the method comprising the steps of regulating the vacuum output of the suction unit to prevent the vacuum output from dropping below a basic level which satisfies basic demands of the machine for the vacuum output and to increase the vacuum output by a predeterminable amount in response to work occurrences of the machine which impose additional work demands of the machine for the vacuum output, said regulating comprising optimizing the vacuum output for a new textile batch by starting the batch with a first predetermined vacuum setting selected to satisfy the basic demands and a second predetermined vacuum setting selected to satisfy the work demands, during a first predetermined time period in the course of the batch counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, subsequently increasing or decreasing at least one of the first and second vacuum settings, during a second subsequent predetermined time period in the course of the batch counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, comparing the number of errors counted during the second time period with the number of errors counted in the first time period to identify an increase or a decrease in the number of errors, if an increase or a decrease in the number of counted errors exceeds a maximum predetermined number of errors then subsequently selecting the greater vacuum setting utilized for the at least one vacuum setting during the first and second predetermined time periods, and if no change in the number of errors is identified or if an increase or a decrease in the number of counted errors is less than the maximum predetermined number of errors then subsequently selecting the lower vacuum setting utilized for the at least one vacuum setting during the first and second predetermined time periods.

2. The method in accordance with claim 1, further comprising, during a third predetermined time period in the course of the batch following said second predetermined time period, counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, comparing the number of errors counted during the third time period with the number of errors counted during the second time period to identify an increase or a decrease in the number of errors, and, if no change in the number of counted errors is identified or if an increase or a decrease in the number of counted errors is less than the maximum predetermined number of errors then subsequently selecting the lower vacuum setting utilized for the at least one vacuum setting during the second and third predetermined time periods, and if an increase or a decrease in the number of counted errors is greater than the maximum predetermined number of errors then subsequently selecting the greater vacuum setting utilized for the at least one vacuum setting during the second and third predetermined time periods.

3. The method in accordance with claim 1, wherein the optimizing step comprises starting the new batch without experimental values regarding the number of errors to be expected in connection with the batch, and reducing the vacuum output after the first and successive time periods until the maximum predetermined number of errors is exceeded and thereafter increasing the vacuum output at least to the preceding level.

4. The method in accordance with claim 1, wherein the optimizing step comprises starting the new batch with experimental values regarding the number of errors to be expected in connection with the batch, and after the first time period, reducing the vacuum output if the maximum predetermined number of errors is not exceeded and increasing the vacuum output if the maximum predetermined number of errors is exceeded.

5. The method in accordance with claim 1, further comprising storing the value of the lowest vacuum output at which the predetermined number of errors is not exceeded as an optimized vacuum value for the batch.

6. The method in accordance with claim 1, wherein the starting step comprises automatically presetting a stored optimal value for the vacuum output.

7. The method in accordance with claim 1, wherein the length of the time periods is matched to a batch running time and to parameters of the textile material.

8. The method in accordance with claim 1, wherein the predetermined vacuum settings for the basic and for the work demand are selected to have a defined relation to one another.

9. The method in accordance with claim 8, wherein the increasing or decreasing step comprises increasing or decreasing both the first and the second vacuum settings in a predetermined relationship to each other.

10. The method in accordance with claim 1, wherein the increasing or decreasing step comprises decreasing at least one vacuum setting for the second time period, and increasing the at least one vacuum setting during the second time period if the number of errors during the second time period exceeds the predetermined number of errors prior to the end of the second predetermined time period.

11. The method in accordance with claim 1, further comprising repeating the counting and the increasing or decreasing steps for a third predetermined time period following said second time period for verifying the vacuum output values utilized during said second time period.

12. A method for regulating the vacuum in a suction air installation comprising a suction unit at a textile machine with a plurality of work stations which make various demands on suction air, the method comprising the steps of regulating the vacuum output of the suction unit to prevent the vacuum output from dropping below a basic level which satisfies basic demands of the machine for the vacuum output and to increase the vacuum output by a predeterminable amount in response to work occurrences of the machine which impose additional work demands of the machine for the vacuum output, said regulating comprising optimizing the vacuum output for a new textile batch by starting the batch with a first predetermined vacuum setting selected to satisfy the basic demands and a second predetermined vacuum setting selected to satisfy the work demands, during a first predetermined time period in the course of the batch counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, and during a second subsequent predetermined time period in the course of the batch, increasing at least one of the first and second vacuum settings if the number of counted errors exceeds a maximum predetermined number of errors and decreasing the at least one vacuum setting if the number of counted errors is less than the maximum predetermined number of errors.

13. The method in accordance with claim 12, further comprising, during the second predetermined time period in the course of the batch, counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, during a third predetermined time period in the course of the batch following the second time period increasing the at least one vacuum setting if the number of counted errors during the second time period exceeds the maximum predetermined number of errors and decreasing the at least one vacuum setting if the number of counted errors during the second time period is less than the maximum predetermined number of errors.

14. The method in accordance with claim 12, wherein the optimizing step comprises starting the new batch without experimental values regarding the number of errors to be expected in connection with the batch, and reducing the vacuum output after the first and successive time periods until the maximum predetermined number of errors is exceeded and thereafter increasing the vacuum output at least to the preceding level.

15. The method in accordance with claim 12, wherein the optimizing step comprises starting the new batch with experimental values regarding the number of errors to be expected in connection with the batch, and after the first time period, reducing the vacuum output if the maximum predetermined number of errors is not exceeded and increasing the vacuum output if the maximum predetermined number of errors is exceeded.

16. The method in accordance with claim 12, further comprising storing the value of the lowest vacuum output at which the maximum predetermined number of errors is not exceeded as an optimized vacuum value for the batch.

17. The method in accordance with claim 12, wherein the starting step comprises automatically presetting a stored optimal value for the vacuum output.

18. The method in accordance with claim 12, wherein the length of the time periods is matched to a batch running time and to parameters of the textile material.

19. The method in accordance with claim 12, wherein the predetermined vacuum settings for the basic and for the work demand are selected to have a defined relation to one another.

20. The method in accordance with claim 19, wherein the increasing and decreasing steps comprise increasing or decreasing both the first and the second vacuum settings in a predetermined relationship to each other.

21. The method in accordance with claim 12, and further comprising, if the decreasing step is performed for the second time period, increasing the at least one vacuum setting during the second time period if the number of errors during the second time period exceeds the predetermined number of errors prior to the end of the second predetermined time period.

22. The method in accordance with claim 12, further comprising repeating the counting step during the second predetermined time period and repeating the increasing or decreasing steps for a third predetermined time period following said second time period for verifying the vacuum output values determined during said second time period.

23. A method for regulating the vacuum in a suction air installation comprising a suction unit at a textile machine with a plurality of work stations which make various demands on suction air, the method comprising the steps of regulating the vacuum output of the suction unit to prevent the vacuum output from dropping below a basic level which satisfies basic demands of the machine for the vacuum output and to increase the vacuum output by a predeterminable amount in response to work occurrences of the machine which impose additional work demands of the machine for the vacuum output, said regulating comprising optimizing the vacuum output for a new textile batch by starting the batch with a first predetermined vacuum setting selected to satisfy the basic demands and a second predetermined vacuum setting selected to satisfy the work demands, during a first predetermined time period in the course of the batch counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, subsequently increasing or decreasing at least one of the first and second vacuum settings during a second subsequent predetermined time period in the course of the batch counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, comparing the number of errors counted during the second time period with the number of errors counted in the first time period to identify an increase or a decrease in the number of errors, if an increase in the number of counted errors exceeds a maximum predetermined number of errors then subsequently selecting the greater vacuum setting utilized for the at least one vacuum setting during the first and second predetermined time periods, and if no change in the number of errors is identified or if an increase or a decrease in the number of counted errors is less than the maximum predetermined number of errors then subsequently selecting the lower vacuum setting utilized for the at least one vacuum setting during the first and second predetermined time periods.

24. The method in accordance with claim 23, further comprising, during a third predetermined time period in the course of the batch following said second predetermined time period, counting errors which cannot be rectified and the attempts to rectify errors caused by insufficient vacuum, comparing the number of errors counted during the third time period with the number of errors counted during the second time period to identify an increase or a decrease in the number of errors, and, if no change in the number of counted errors is identified or if an increase or a decrease in the number of counted errors is less than the maximum predetermined number of errors then subsequently selecting the lower vacuum setting utilized for the at least one vacuum setting during the second and third predetermined time periods, and if an increase in the number of counted errors is greater than the maximum predetermined number of errors then subsequently selecting the greater vacuum setting utilized for the at least one vacuum setting during the second and third predetermined time periods.