The Needle-Board
As before mentioned, the heads of the needles are passed through the needle-board. A drawing of this board, representing the front view, is shown in Fig. XI. The following are the dimensions:
a to c, = 9-1/2 inches. a to b, = 2-3/8 inches.
Each side of the prism, always technically called the cylinder, has a protruding peg about 1/2 inch in length. When in contact with the needle-board these pegs enter the black holes shown upon either side in drawing. The 208 needles and holes in the present machine are represented by a small spot for the former with an outside ring for the latter.
The lifting of the griffe, which in turn also operates the other parts of the Jacquard head, as explained before, is not always produced from above: very often this lifting is arranged to be done by means of a lever arrangement from below the griffe. This method of working the mechanism in the Jacquard machine is illustrated by Fig. XII., representing the perspective view of a 400 Jacquard machine, (W. P. Uhlinger, builder).
Fig. XIII. represents the same machine adjusted to the loom. On the longer arm of the lever a series of holes are found. These regulate the height of the lift by the vertical rod which provides the required movement. The nearer this rod is adjusted to the Jacquard head the higher the lift of the Jacquard harness, thus forming the shed.