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1. WO2020117273 - PRINT HEAD MAINTENANCE ASSEMBLY

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A print head maintenance assembly, the print head maintenance assem bly comprising:

a maintenance cartridge comprising a positioning flag, wherein the maintenance cartridge is movable along a maintenance path in a direction of movement; and

a sensor to detect the positioning flag to determine the position of the maintenance cartridge along the maintenance path.

2. The print head maintenance assembly of claim 1 , wherein the positioning flag is a protrusion arranged on a side face of the maintenance cartridge.

3. The print head maintenance assembly of claim 2, wherein the sensor is a photoelectric sensor and the positioning flag triggers the photoelectric sensor when the maintenance cartridge is in a reference position.

4. The print head maintenance assembly of claim 1 , wherein

the maintenance cartridge further comprises a status flag to indicate a status parameter of the maintenance cartridge; and

the sensor is to detect the status flag to determine the status parameter of the maintenance cartridge.

5. The print head maintenance assembly of claim 4, wherein the mainte nance cartridge further comprises a spittoon to receive material ejected from a print head and the status parameter characterizes a filling level of the spittoon.

6. The print head maintenance assembly of claim 4, wherein the mainte nance cartridge further comprises a web wipe to wipe a print head and the sta tus parameter characterizes a usage status of the web wipe.

7. The print head maintenance assembly of claim 4, wherein the status flag is a protrusion on a side face of the maintenance cartridge wherein the status flag is to change a position of the flag on the side face with a status change or to increase or decrease a visible length of the flag outside the maintenance cartridge with a status change.

8. A printing device comprising:

a print head, wherein the print head is movable along a print head path in a scanning direction;

a maintenance cartridge comprising a positioning flag;

a sensor to detect the positioning flag;

an actuator to move the maintenance cartridge along a maintenance path; and

a controller to control the actuator and to read out a sensor signal from the sensor, wherein the controller determines the position of the maintenance cartridge from the sensor signal.

9. The printing device of claim 8, wherein the controller tracks the position of the maintenance cartridge by determining a distance that the maintenance cartridge moves after the controller determined the position of the maintenance cartridge from the sensor signal.

10. The printing device of claim 8, further comprising a number of positioning flags having at least one of varying widths or distances to encode a number of positions along the length of the maintenance cartridge.

11. The printing device of claim 8, wherein

the maintenance cartridge further comprises a warning flag to indicate that the maintenance cartridge is at a safe or unsafe position; and the sensor is to detect the warning flag to determine whether the mainte nance cartridge is at a safe or unsafe position.

12. A method of controlling a print head maintenance assembly in a printing device, the print head maintenance assembly comprising:

a maintenance cartridge having a positioning flag; and

a sensor to detect the positioning flag;

the method comprising:

moving the maintenance cartridge along a maintenance path until the sensor is triggered by the positioning flag when the maintenance cartridge is at a reference position.

13. The method of claim 12, further comprising:

moving the maintenance cartridge along the maintenance path until a mechanical stop is detected at a bump position;

determining a distance moved by the maintenance cartridge between the reference position and the bump position; and

comparing the distance moved by the maintenance cartridge to a prede fined target value.

14. The method of claim 12, wherein

the maintenance cartridge further comprises a status flag;

the method further comprising:

moving the maintenance cartridge along the maintenance path until the maintenance cartridge is at a status position;

detecting the status flag by the sensor;

determining a status parameter of the maintenance cartridge based on a signal generated by the sensor.

15. The method of claim 12, wherein

the maintenance cartridge further comprises a warning flag to indicate that the maintenance cartridge is at a safe or unsafe position; and the sensor is triggered by the warning flag when the maintenance car tridge is at a safe or unsafe position, respectively;

the method further comprising:

determining whether the sensor is triggered before moving the maintenance cartridge.