Water application unit for automatically applying water onto sheet being transferred

A water application unit comprising:

• a reservoir configured to pool water;
• a water application pad configured to apply the water pooled in the reservoir onto a remoistenable glue portion previously attached to an adhesion position on a sheet being transferred,
• wherein the water application pad comprises
• a first pad member disposed at a position to be immersed in the reservoir and including first pores for sucking up the water in the reservoir, and
• a second pad member disposed at a position to face the remoistenable glue portion while being in contact with the first pad member and including second pores for applying the water onto the remoistenable glue portion, the second pores having a diameter larger than a diameter of the first pores;
• spacers;
• and
• a plurality of pad sandwiching plates configured to sandwich and hold the first pad member and the second pad member, and arranged via the spacers with a plurality of spaces from the second pad member at a portion toward an end of the second pad member for applying the water onto the remoistenable glue portion.