| 摘要 |
A method for sensing an end of roll paper of a printer, the method comprising: providing one or more back sensors for detecting a set of first marks on the back of the roll paper for aligning text printed on the roll paper, the set of first marks having a first predetermined size; detecting the set of first marks on the back of the roll paper to convey first information to a user of the printer; and detecting a set of second marks to indicate to the user of the printer that the roll paper is ending, the set of second marks of a second predetermined size on side portions of the roll paper, the second set of marks having additional information and the second predetermined size being larger than the first predetermined size.
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