System for in-line treatment of thread with a mechanism to selectively position a discharge device

1. A system for in-line treatment of thread for use with a thread consuming device, comprising:

a treatment unit comprising at least one discharge device being configured to dispense one or more coating substances onto the at least one thread when activated; and

a drive unit being configured to move said at least one discharge device between an idle position and an operational position being arranged along an axis of movement, wherein the drive unit is configured to move said at least one discharge device by means of a mechanism providing different transmission ratios between the drive unit and the discharge device depending on the position of the discharge device along the axis of movement.

2. The system according to claim 1 , wherein the transmission ratio of the mechanism is lower when the discharge device is in the operational position than when the discharge device is between the idle position and the operational position.

3. The system according to claim 1 , wherein the transmission is configured to convert a rotary motion of the drive unit to a linear motion of the discharge device.

4. The system according to claim 1 , further comprising a control unit being configured to control the operation of the drive unit.

5. The system according to claim 4 , wherein the treatment unit further comprises a position sensor configured to determine at least one position of the drive unit, and wherein the control unit is configured to control the operation of the drive unit based on the determined position(s).

6. The system according to claim 1 , wherein the mechanism comprises an actuator at one end connected to the discharge device and at a second end connected to a crank being connected to the drive unit, thus forming a rod and crank mechanism operatively connecting the discharge device and the drive unit.

7. The system according to claim 6 , wherein the actuator comprises a connecting rod having a curved portion and a straight portion, and wherein the curved portion is configured to accommodate a rotational axis of the drive unit.

8. The system according to claim 6 , wherein the transmission ratio is proportional to a cosine function depending on the position of the crank such that a maximum transmission ratio is achieved when the discharge device is between the idle position and the operational position.

9. The system according to claim 8 , wherein the idle position and/or the operational position is located near rad π±π/2 as measured from the angular position of the crank when the discharge device is approximately in the middle between idle position and the operational position.

10. The system according to claim 1 , wherein the drive unit comprises a motor.

11. The system according to claim 10 , wherein the motor is a step motor.

12. The system according to claim 10 , wherein the motor is a DC-motor.

13. The system according to claim 1 , wherein the treatment unit comprises at least two discharge devices and a control unit, wherein each discharge device is associated with a separate drive unit, and wherein the control unit is configured to control selective activation of each one of the discharge devices and the drive units.

14. The system according to claim 1 , wherein each discharge device comprises a plurality of nozzles arranged at different positions relative the longitudinal extension of the at least one thread, said at least one thread being in motion in use, each nozzle being configured to dispense one or more coating substances onto the at least one thread when activated.

15. The system according to claim 14 , wherein the nozzles are inkjet nozzles.

16. The system according to claim 1 , wherein the coating substance is a colouring sub stance.

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

18. The system according to claim 17 , 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, or any combination thereof.

19. A method for in-line treatment of at least one thread, comprising:

providing a treatment unit comprising at least one discharge device being configured to dispense one or more coating substances onto the at least one thread when activated;

providing a drive unit,

wherein the drive unit is configured to:

to move said at least one discharge device between an idle position and an operational position being arranged along an axis of movement, wherein the drive unit is configured to move said at least one discharge device by means of a mechanism providing different transmission ratios between the drive unit and the discharge device depending on the position of the discharge device along the axis of movement.