Kruzh.com

4.2. The contrivance for winding bobbins of a type model

Authors of the book investigated dozens of bobbins applied in the central provinces of Russia. The investigations allowed to bring out a typical row of bobbins having middle statistician sizes in millimeters (Fig.4.17).

- total length L = 160 ± 15;

- neck length s = 40 ± 10; diameter 10 ± 2;

- handle length z = 60 ± 16 (conical form); maximal diameter 15 ± 2, minimal one
6 ± 2;

- a semispherical head with radius 8 ± 2.

Fig.4.17. A typical bobbin

The authors decided to work out a winding contrivance that would be fit to bobbins of announced typical row. A condition was adopted to simplify the first model - to rotate the bobbin by hand without acceleration.

The winding device is presented on the photo (Fig.4.18). The bobbin handle is inserted into the inner ring of the tail ball-bearing. The movable platform is shifted left or right depending on length and form of bobbin handle. The bobbin head is to be inserted into the cup of the chuck tightly. The movable platform is fixed at the chosen position. The basic platform is to be pressed to the table with a bracket. When all preparations are made, a lace maker starts winding bobbins. Some seconds are spent to adjust the device to a new bobbin.

The described device was placed at the Forum of the site “The needlewoman” (www.klk.pp.ru) 01/30/2006.

Fig.4.18. Winding device

The device was being tested for a long time using bobbins of the typical row. Naturally problems arose when bobbins happened to fall out of the row. As a rule it took place when a bobbin had an irregular form for instance it looked like an irregular cylinder or a barrel. Of course discomfort arose when bobbin sizes exceeded middle ranges.

Then authors decided to advance the winding device in two directions:

- enlarge acceptable ranges of bobbin sizes;

- eliminate restrictions applied to the bobbin form;

- accelerate winding.