a portable label applying machine for applying labels to articles , especially accurate labels previously printed with distinct and accurate indications such as bar codes . the label applying machine carries a label cassette . the label cassette is removable and replaceable as a unit in the label applying machine . the label cassette is a complete unit with a supporting section for supporting a rolled label strip , a peeling section to peel labels and a guide section along one side to guide a backing paper of the label strip . the label applying machine detachably holds the label cassette and is provided with a self - contained feeding mechanism to shift the backing paper along the guide section and an applying section for applying peeled labels to articles . a plurality of cassettes with pre - printed bar code labels may be used interchangeably with a single label applying machine .