Method for in-line treatment of a thread and a system therefore comprising a treatment unit and a control unit configured to determine if a maintenance sequence is needed

1. A system for in-line treatment of thread, the system comprising:

a treatment unit comprising at least a first print head and a second print head, each being configured to dispense one or more coating substances onto the at least one thread; and

a control unit configured to determine if a maintenance sequence is to be performed on at least the first print head and configured to schedule said maintenance sequence, and if the control unit determines that the maintenance sequence is to be performed, the control unit schedules said maintenance sequence on at least the first print head; and

a thread buffer system being arranged downstream the at least two print heads, wherein the control unit is further configured fill up the thread buffer system when it is determined that the maintenance sequence is to be performed.

2. The system according to claim 1 , wherein the control unit is configured to:

receive a current operating speed of a thread consuming device, and

the determining if the maintenance sequence is to be performed is at least based on said current operating speed.

3. The system according to claim 1 , wherein the control unit is further configured to:

receive a thread consumption of a thread consuming device, and

the determining if the maintenance sequence is to be performed is at least based on said thread consumption.

4. The system according to claim 1 , wherein the control unit is further configured to control at least one of the first print head and the second print head to be arranged in an operation mode, simultaneously with being arranged in a maintenance mode.

5. The system according to claim 1 , wherein the determining if the maintenance sequence is to be performed is at least based on a predetermined operating pattern.

6. The system according to claim 1 , wherein the determining if the maintenance sequence is to be performed is at least based on an estimated consumption of the coating substance.

7. The system according to claim 1 , wherein the control unit is further configured to determine a time interval for said maintenance, and to determine if the maintenance sequence is to be performed at least based on said time interval.

8. The system according to claim 1 , wherein the maintenance sequence is performed without stopping a thread consumption of the thread consuming device.

9. The system according to claim 1 , wherein the control unit is configured to perform the maintenance sequence of at least the first print head by moving said first print head from a first position to a second position and is configured to deactivate said first print head from dispensing the coating substance onto the at least one thread.

10. The system according to claim 9 , wherein at least the second print head is arranged in the first position while at least the first print head is arranged in the second position.

11. The system according to claim 9 , wherein the first position is an operational position and the second position is a maintenance position.

12. The system according to claim 1 , wherein each of the first print head and the second print head comprises a plurality of nozzles arranged at different positions relative the at least one thread, said at least one thread being in motion in use, and each nozzle being configured to dispense one or more coating substances onto the at least one thread when activated.

13. The system according to claim 12 , wherein the control unit is further configured to alter the number of active nozzles based on the current required flow rate of the one or more coating substances.

14. The system according to claim 12 , wherein the control unit is further configured to alter the number of active nozzles based on desired visual appearance of the thread.

15. The system according to claim 12 , wherein the nozzles are inkjet nozzles.

16. The system according to claim 1 , further comprising a thread consuming device.

17. The system according to claim 16 , wherein the thread consuming device is an embroidery machine, a sewing machine, a knitting machine, a weaving machine, a tufting machine, a thread winding machine, and or any combination thereof.

18. The system according to claim 1 , wherein the system further comprises a thread feeder arranged upstream of the print heads and wherein the control unit is configured to stop the thread feeder once the control unit has determined that the maintenance sequence is to be performed.

19. The system according to claim 1 , wherein during the maintenance sequence, the thread consuming device is consuming thread from the thread buffer system.

20. A method for in-line treatment of at least one thread in a thread consuming device, comprising:

providing a treatment unit comprising at least a first print head and a second print head;

providing a control unit in communication with the first print head and the second print head;

providing a thread buffer system being arranged downstream the first print head and the second print head;

dispensing, via at least one of the first print head and the second print head, one or more coating substances onto at least one thread;

determining, via the control unit, if a maintenance sequence is to be performed on at least the first print head;

scheduling, via the control unit, said maintenance sequence on at least the first print head; and

the control unit filling up the thread buffer system when it is determined that the maintenance sequence is to be performed.