The KR 221-223 mounts onto most KR 215 and KR 219 label bases and even works with some Cheshire bases. Applies roll form postage stamps at rates up to 18,000 pieces per hour. Built-in flexibility means up to six stamps can be applied in a single pass. Positive control of the stamp is maintained using vacuum wheels to transfer the stamp from the rotary knife, against the glue wheel and onto the mail piece. A miss feed detection circuit disengages the rotary knife and indexing wheel when a media miss feed occurs preventing stamp feed. For pressure sensitive stamps, use the KR 535 Tabmaster.