The stagger stitch reduces the thread build-up along the book spine by alternating the thread position. It is especially useful when sewing thick books printed on thin paper.
Besides, for the asterPRO book sewing machine, the switch between normal and staggered stitch is automatically set up via the control panel. Additionally, an exclusive device takes control of the hook turning by auto setting a delta for the left and for the right angle according to the respective stitch direction.
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