The gluing unit is provided with: a glue tank (2); a glue applicator roller (3) that applies the glue on the back (r) of a text block (P); a motor (4) that rotates the glue applicator roller; a wiper (6) that adjusts the amount of glue adhering to the glue applicator roller; a wiper drive mechanism that brings the wiper closer to or away from the glue applicator roller; and a control unit (10) that controls the wiper drive mechanism.
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