Model of power loom with double shuttle box (scale 1:2)

Model of power loom with double shuttle box (scale 1:2), maker unknown, 1840.

This is a model of a loom that will weave plain calico or checks; it has two tappets and a double shuttle-box, so that two colours of weft may be used. The shedding is open, and the tappets work negatively. They are moved by cords passing over segmental arms fixed on two shafts which are rocked by an oscillating frame, operated by a cam on the lower shaft. The picker at each end is moved by cords attached to an arm fixed to a pulley, which is turned through a small angle by a leather strap, whose ends are pulled down alternately by cam- moved levers. To move the shuttle-boxes a spur wheel, driven from the lower shaft, carries a cam on its face which acts upon a horizontal lever that depresses the boxes. When released, the shuttle-boxes return to their normal position through the action of a spring, attached beneath the sole of the lay. The letting- off motion is governed by a rope brake, and the taking-up arrangement consists of a ratchet wheel and gearing, moved from the crank-shaft.