3Dモデル: Komisen-inro-tsugi by thejoinery on Sketchfab
組み立ての要点
Kiritsuke Tsugi is the most basic form of Japanese scarf joint. Two members receive opposing tapered cuts at angles typically between 1:8 and 1:10, creating long-grain-to-long-grain contact for strong gluing surfaces. Unlike complex temple-grade tsugite, it relies on adhesive and clamping rather than mechanical interlock. It serves as an excellent introduction to angled layout and saw control before advancing to Kanawa Tsugi and Okkake Daisen Tsugi.
歴史的背景
Kiritsuke Tsugi represents the foundational lengthening joint in Japanese carpentry. Its simple geometry predates the more elaborate temple-grade scarfs and remains in use today for non-structural applications, repair work, and as a teaching joint. Students master angled cuts and grain orientation here before tackling Kanawa Tsugi and Okkake Daisen Tsugi.
組み立て手順
- Mark the scarf angle (typically 1:8 to 1:10) on both pieces using a marking gauge and square.
- Saw the angled faces on each member, ensuring they are complementary.
- Plane the mating surfaces flat and square for maximum gluing contact.
- Apply adhesive and clamp firmly along the length; allow to cure before handling.
日本で見られる場所
- Traditional house construction — Throughout Japan — non-structural beam extensions
バリエーション
The scarf angle can be adjusted: steeper angles (1:8) provide more gluing surface but require longer overlap. Some variants add a single dowel or pin for extra security. For structural use, Japanese craftsmen typically advance to mechanically locked scarfs like Kone Tsugi or Kanawa Tsugi.
用途
- Beam extensions
- Long spans
- Practice joint
- Non-structural lengthening
必要な道具
- Ryoba saw
- Kanna plane
- Marking gauge
- Square