The invention discloses an ingress protection mechanism for a portable printer 100. The portable printer 100 comprises a housing 10. The housing 10 accommodates one or more one feed rollers 21 for conveying a paper towards a print head 16. A slit 20 is provided in the housing 10, through which the paper is discharged out after printing by the print head 16. The ingress protection mechanism has a cover 25 for closing the slit 20. An actuator 28 is provided to selectively open the cover 25 when the print head 16 is in use. The actuator 28 is operated to open the cover 25 till at least one of the print head 16 and the feed roller 21 are operated. Reference figure: Figure 1
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