Delta - Information from Louet

Delta, the flagship of our looms with treadles, is a loom that like our Spring, thanks its exceptional qualities to the application of the parallel counter march system and moving breast beam. Delta is available with eight or twelve harnesses and in two weaving widths: 110 cm (43 3/8”) and 130 cm (51 1/4”). Delta is equipped with a friction brake device on the warp beam and a ratchet advancing system on the cloth beam.

Delta is made of lacquered ash and comes with the castle section assembled. The loom is equipped with a built-in raddle, a shelf for storage, a stainless steel reed 40-10 (metric), 1200/1400 Texsolv heddles (330 mm), tie-up and lease sticks and sixteen warp sticks.

Dimensions (wxdxh)
Delta 110: 140 x 100 x 128 cm (55” x 39 3/8” x 50 3/8“)
Delta 130: 160 x 100 x 128 cm (63” x 39 3/8” x 50 3/8“)

Delta 110: 88 kg (194 lb)
Delta 130: 93 kg (205 lb)
Add 8 kg (17 lb) for an extension set


The parallel counter march system
In a counter march loom, every harness is actively involved in each shed: each harness is either lifted or pulled down by each pedal. The diagram helps you to understand how the Louët parallel counter march system works. Each harness and corresponding lams are attached to the cord, running over the six rollers. The ends of the cord are connected, so the cord is a closed circuit. When treadle A is pressed down, lam C moves the outside cord downwards. The inside cord moves in the opposite direction and pulls harness F upwards, as indicated by the arrows. When B is treadled down, lam D pulls the inside cord and also the harness downwards. In their action, the lams and the harnesses always stay horizontal. This means that all treadles work the same over the full width of the loom. Uneven sheds, for example a satin weave shed, where four harnesses are lifted and one is pulled down, open cleanly every time. The warp ends on the fifth harness do not tend to ride up as they often do with jack looms. When the shed is made, the same tension is applied to the raised ends as to the lower ones resulting in equal tension everywhere on the warp.


The moving breast beam
The moving breast beam allows the harnesses to move easier in their opposite directions. Looking at the diagram that shows the loom from the side, you will see that a shed gives the warp a kind of parallelogram shape. If you imagine that the warp is inelastic (like metal wire), you will understand that making a shed is only possible if the distance between the breast beam G and the back beam H is reduced. When this distance is fixed, like on other looms, the opening of the shed depends completely on the elasticity of the warp. When the shed opens, the tension on the yarn increases enormously, in case of a less elastic warp. That causes heavy treadling and may damage the warp. However, we designed a moving breast beam that is attached with arms to the loom. At the bottom side the arms are held by adjustable springs, to give the warp the required tension. When the shed is made, the arms move and the tension on the warp hardly increases. Threading goes lighter and the warp will never be overstretched. A second advantage of this device is that the springs guarantee exactly the same warp tension, each time after advancing the fabric. The same vertical position of the arms, after advancing, determines the same tension on the warp again. Our Spring, Delta, Octado and Megado looms are equipped with this moving breast beam system.