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Muller 321 Stitcher Gatherer
Minimum untrimmed (HF lip)	4 1/8 x 4 1/8”
Maximum untrimmed (HF lip)	12 ½ x 18 7/8”
Minimum untrimmed (no lip)	3 x 4 1/8”
Maximum untrimmed (no lip)	11 3/8 x 17”
Minimum size – cover feeder	6 ½ x 3 ½”
folding to	3 Ό x 3 ½”
Maximum size – cover feeder	24 Ό x 18 7/8"
folding to	12 1/8 x 18 7/8”
Stitcher
Maximum thickness cover to cover	3/8”
Minimum size	4 1/8 x 5”
Maximum size	12 ½ x 18 7/8”
Minimum distance between stitches
(for book up to 1/4” thick – HK55 narrow heads)	2”
(for book up to 3/8” thick – HK75 heads)	3”
Loop Stitching
Minimum distance between loop stitches  (minimum 1” from head or foot to center of stitch)	3 3/16” cc min
Trimmer
Minimum size untrimmed	4 1/8 x 5”
Maximum size untrimmed	12 ½ x 18 7/8”
Minimum size trimmed	3 x 5 7/8”
Minimum size with difficulty  (including cutting belts)	3 x 5 ½” 3 x 4 ½”
Maximum size trimmed without difficulty	12 x 18 ½”
Maximum size trimmed with difficulty (additional make ready time required)	12 Ό x 18 ½”

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