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Zigzag Stitch Mechanism
Ralph M. Sharaf · Public domain (expired patent)
Tex

Nilikha ni

Tex

22. Setyembre 2026FO
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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.
Katamtaman
3 hours

Mga Tagubilin

1

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.

Mga materyales para sa hakbang na ito:

Plantsa ng playwudPlantsa ng playwud1 piraso

Mga kailangang kasangkapan:

Lagaring PangkamayLagaring Pangkamay
Walang-Kableng BarenaWalang-Kableng Barena
RulerRuler
2

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.

Mga materyales para sa hakbang na ito:

Mga turnilyo ng makinaMga turnilyo ng makina4 piraso
Iba't ibang compression springIba't ibang compression spring1 set
Kahoy na TarugoKahoy na Tarugo1 piraso
Pangmarkang Hindi NabuburaPangmarkang Hindi Nabubura1 piraso

Mga kailangang kasangkapan:

Baril ng mainit na pandikitBaril ng mainit na pandikit
Bais sa Mesang PanggawaBais sa Mesang Panggawa
3

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.

Mga materyales para sa hakbang na ito:

Papel na GrapPapel na Grap1 pilyego
Teyp na pantakipTeyp na pantakip1 rolyo

Mga kailangang kasangkapan:

RulerRuler
4

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.

Mga materyales para sa hakbang na ito:

Pakete ng nitong tela para sa tisertPakete ng nitong tela para sa tisert1 piraso
Sinulid na poliesterSinulid na poliester10 metro

Mga kailangang kasangkapan:

Makinang panahiMakinang panahi
Gunting sa telaGunting sa tela
5

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.

Mga kailangang kasangkapan:

RulerRuler
Panukat na TapePanukat na Tape
6

Thread geometry and your results

Naglo-load ng Jupyter notebook…
7

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.
Hakbang 7 - Image 1

Mga Materyales

9

Mga Kinakailangang Kasangkapan

8

Kaugnay na Blueprint

Ang mga blueprint na ito ay nagbabahagi ng kaalaman — mga teknik, materyales, o prinsipyo

The Lock Stitch Sewing Machine — Mechanized Garment Construction

The Lock Stitch Sewing Machine — Mechanized Garment Construction

ni TexFO

Tela at Katad

52
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CC0 Pampublikong Domain

Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.

Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.

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