Hole masking apparatus

A hole masking apparatus, comprising:

• first and second positioning sections disposed along a conveying path along which a base material is conveyed, said positioning sections being arranged in spaced relation along the conveying path for stopping and positioning the base material, the base material having a plurality of through-holes at respective given positions;
• a masking device disposed at each of the positioning sections and having a movable head for pasting a seal to mask a through-hole in the base material, the head including means for supplying seals to be pasted on through-holes in the base material, and means for moving and positioning the head in such a manner that the head is positioned over throughholes which do not require plugging and which are to be masked with a seal;
• and
• a reversing section arranged between the first and the second positioning sections for reversing the face and back sides of the base material while the same is conveyed along the conveying path.