I invented and made this in my phase of making & selling hand-weaving looms.
This is my "Acrylic WarpWrapper", photographed at the Eden Project, Cornwall, where we were doing a weaving week.
I invented this loom to make tablet-weaving (sometimes known as card--weaving) easier. It is warp-weighted, using bits of copper piping with a some lead in them attached via a fishing-tackle hoop to the yarn. The brushed steel drawer-knobs on the side are used when warping up the loom. Traditionally tablet-weaving was done by fixing one end to your belt and the other to a stake in the ground - not very user-friendly, hence the invention.
The four wooden cross-pieces, hold the two sides together using the simple idea of chamfered dowel-rods, and double-up to enable weaving longer pieces by going up and over them.
Tablet-weaving is an ancient weaving technique used by the Chinese to make horse-reigns, and the Mongolians to hold together their yurts - still is. I occasionally tablet-weave tie-belts, and the odd hand-bag strap.