FIG. 64.
DOUBLE-ACTION JACQUARD, SINGLE CYLINDER.
The speed may still further be increased by having a double-action machine with double cylinders and two sets of needles and hooks (see [Fig. 65]).
In this system two sets of cards are employed, all the odd picks on one cylinder and the even ones on the other—thus, the cylinders only revolve at half the speed, causing less vibration and giving an increase of 20 picks per minute. If requisite, this machine can also be arranged as a compound or cross-border machine, carrying two sets of cards of different patterns, only one set in use at once, while, by pulling a handle, the other set can be actuated instead, so as to weave an entirely different pattern in the cloth—e.g., in the heading of a tablecloth, shawl, or handkerchief.
FIG. 65.
DOUBLE-ACTION JACQUARD, DOUBLE CYLINDER.
Ties.
There are two arrangements of the machine—the London arrangement being best, in which case the cards and card race are at the loom side and in better view. [Fig. 62] shows this system. There is, however, more strain on the harness, as the short rows of hooks are at right angles to the short rows in the cumber board, thus:—