| 摘要 |
<p>Sew blade spine is pressed from the rear by two slide guides so the toothed cutting edge presses against the work. The uneven configuration of teh spine varies the distance along it between spine and cutting edge. - The spine shape should consists of alternating depressed (18) and main sectors (20), both to be without steps and to run parallel to the cutting edge and connected to one another by short inclined transition sectors (22, 24). Pref. depressed and main sectors are of identical length.</p> |
