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Electric eye tracking principle of trademark sticker printing machine
The following possibilities:

1, jump distance is not allowed, and there is accumulated error;

2. The sensitivity of the electric eye is not enough to accurately read the black mark;

3, the black label is not black, and the electric eye is not good.

If it keeps stopping, it is suggested to punch holes instead, or reprint the black label on the other side, and try again after reading it.