Off-square cut (rhomboid book)
High severitySymptoms
Head and foot not perpendicular to the spine; visibly crooked margins
Probable causes
- Block entering rotated
- positioning square misadjusted
- spine not parallel to the stop
- pusher off-center
The Print Guy · 2026-10-05
Other problems in this category
Three-knife trimmer · TPG-247
Variable sizes between books in one run
Inconsistent final format; some books shorter or narrower
Three-knife trimmer · TPG-249
Draw: cover or first pages pulled
Cover or top sheets shorter or with an inward-curved edge
Three-knife trimmer · TPG-250
Rough, torn or flaky trim edges
Edges not smooth; torn paper; flaking on laminated covers
Three-knife trimmer · TPG-251
Clamp marks on the cover
Sunken or shiny rectangular imprint on book covers
Three-knife trimmer · TPG-252
Concave or convex front trim (block draw)
Front cut not straight: bowing in or out at the book's middle
Three-knife trimmer · TPG-253
Trimmings jamming or lingering in the cut area
Trim strips piling up, soiling the next cut or jamming the machine