Abstract: This invention relates to a heat sensitive glue activating labeler using one drum in which a label adsorbing portion capable of being adjusted to a size of a label.

Abstract: An automatic labeler comprising (1) a label peeling-applying unit including a rotary drum provided at its periphery with at least one label-sucking slit, (2) a mounted label feeding unit including a support plate provided at its forward end with a peeling means such as a peeling blade or a guide pin and (3) a conveyor for conveying articles to be labeled, characterized in that a mounted label is bent at the peeling means to peel the tip of the label from the mount, the peeled tip of the label is sucked to the label-sucking slit of the rotary drum while the label-free mount is held at the peeling means provided on the support plate, the rotary drum and support plate are rotated at the same peripheral velocity in the same direction to complete peeling of the label from the mount simultaneously with attraction of the peeled label to the sucking slit under vacuum, and the label so attracted is then applied to an article on the conveyor while the vacuum is released and the rotary drum and conveyor are moved at the