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David-III
ADJUSTMENTS FOR SHAFTS AND BEATER
In order for the David III to operate correctly, it is important that the shafts and the beater are
adjusted to the proper heights and positions. We have written this additional instruction to
clarify the assembly manual.
Parts of the shaft system
Let's identify the various parts of the loom before explaining how to set the shaft heights,
correct terminology is important.
1- Cam and blocking pin
2- Shaft cords
3- Shaft bars and heddles
4- Lam cords
5- Eye bolt with adjusting nut
6- Red C-clamp to keep eye bolt
centered
7- Treadle tie-up cord
8- Treadles
9- Beater hinge hook
The David is a sinking shed loom, so the shafts are pulled downward to make a shed.
In the castle you see cords that are connected to a cam disc on the right side, and a spring on
the left. The cam rotates as you depress a treadle, and by its design and mechanical
properties, the cam reduces the force required to depress the treadle, the further the cam
rotates.
The spring pulls on the cam ensuring the shafts are pulled back up to their rest position.
In order to get a good shed, it is important to adjust the shaft height properly. During
assembly you adjust the height so that you can weave on it. Once you have threaded the first
warp, you fine-tune the shaft positions to optimize your shed. Further on in these instructions
you will find a detailed description of how to set the shaft height. In addition to adjusting the
shaft height, it is important to adjust the beater height.
On the next page you will find pictures and descriptions of the components of the system
followed by how to make the adjustments.
26-01-2022
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Summary of Contents for Louet David-III
- Page 1 David-III ADJUSTMENTS FOR SHAFTS AND BEATER In order for the David III to operate correctly, it is important that the shafts and the beater are adjusted to the proper heights and positions. We have written this additional instruction to clarify the assembly manual.
- Page 2 Cam – after adjustment, cam 1 for shaft 1, is turned more to the right than cam 8 (shaft 8). On the bottom of the cam, there is another adjusting screw. The horizontal position of a shaft can be adjusted with this screw. Use the blocking pin to block the cam while threading and tying up treadles.
- Page 3 Adjust shafts During assembly of the loom you make the first 'rough' set up of the shafts. Fine tuning the shafts is best done when you have threaded and tied up a warp, using all eight shafts. After you have made an initial adjustment and have woven a piece, you can fine-tune the shaft heights even further.
- Page 4 • Then adjust the height of the rear shaft. • The distance between the castle and the top of the rear shaft bar should be 6 cm. • Next adjust the other shafts so that they gradually increase in height from the front of the loom to the back •...
- Page 5 • The blocking pin is removed during weaving and when adjusting the shaft and beater heights. • With the first series David-III (2021) you could still depress a treadle while the blocking pin was inplace. This is no longer possible with the later series.
- Page 6 Beater height adjustment With the David, the shed is created by shafts being pulled down. The optimum shed has the lower half of the shed lying on the shuttle race so that your shuttle slides smoothly over shuttle race. As you weave and the fell line gets closer to the reed, the shed becomes smaller and the lower half of the shed can start to lift off of the shuttle race.
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