艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
Zigzag Stitch Mechanism
The lock-stitch machine already published sews a straight line, and a straight line of thread cannot stretch - which is why early machines could not sew knitted cloth, finish a raw edge, or work a buttonhole. The next rung is a mechanism that swings the needle bar sideways between stitches, driven by a cam turning with the main shaft.
**US 1,466,150**, "Zigzag mechanism for sewing machines", Ralph M. Sharaf, filed 2. April 1917, granted 28. August 1923: a cam-driven vibration of the needle bar while the machine stitches, with the throw adjustable. Domestic zigzag machines followed in the 1950s.
**You build the motion in wood** - a cam, a follower and a pen drawing the needle's path - then sew both stitches on jersey and pull them until something gives.
中级
3 hours
说明
1
1
Cut a cam
Cut a cam
From 18 mm plywood cut a 60 mm disc and drill its pivot hole 5 mm off centre: that offset is half the zigzag width. Cut a second disc with a 10 mm offset for a wider stitch.
此步骤所需材料：
胶合板1 个所需工具：
手锯
充电式电钻
直尺2
2
Follower and needle bar
Follower and needle bar
Screw a pivoted arm to the board so one end rides on the cam's edge and the other carries a dowel - the needle bar. A spring keeps the follower against the cam. Tape a marker to the dowel.
此步骤所需材料：
机螺钉4 个
压缩弹簧套件1 套
木榫条1 个
油性记号笔1 个所需工具：
热熔胶枪
台虎钳3
3
Draw the stitch
Draw the stitch
Pull a strip of graph paper steadily under the pen while turning the cam by hand, one turn per stitch. Measure the width of the trace; swap cams and repeat. Lock the follower to draw a straight line for comparison.
此步骤所需材料：
坐标纸1 张
美纹纸胶带1 卷所需工具：
直尺4
4
Sew the real thing
Sew the real thing
Cut six 200 x 50 mm jersey strips. Join them in pairs with a 100 mm seam: straight stitch, zigzag 3 mm, zigzag 5 mm, all at 2.5 mm stitch length.
此步骤所需材料：
T 恤针织面料组合1 个
涤纶线10 米所需工具：
缝纫机
裁布剪5
5
Pull until it gives
Pull until it gives
Mark 100 mm across each seam. Pull each pair apart steadily by hand and note the marked length when the thread snaps - or when it does not, and the cloth simply stretches.
所需工具：
直尺
卷尺6
6
Thread geometry and your results
Thread geometry and your results
正在加载 Jupyter 笔记本…
7
7
History & Context
History & Context
**What the patent specifies:** a cam-driven mechanism that vibrates the needle bar laterally during stitching, with adjustable throw. **Modern build (derived):** a plywood cam and follower drawing the path, plus real seams for the test.
The same sideways swing gave overcast edges, buttonholes and decorative stitches, and cam stacks later let a machine select a pattern. Its limits: a zigzag uses more thread, can tunnel thin cloth if the tension is wrong, and the needle bar's sideways travel puts a limit on machine speed.
材料
9- 1 个占位符
- 4 个占位符
- 1 套占位符
- 1 个占位符
- 1 个占位符
- 1 张占位符
- 1 卷占位符
- 1 个占位符
- 10 米占位符
相关蓝图
这些蓝图共享知识——技术、材料或原理
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。