Fig. 159
The cylinder is connected with the back griffe only, and remains in for two shots. The griffe A is first raised, and a shot thrown in; it is then lowered, and the griffe A1 raised, which presses out the cylinder and changes the card; a second shot is thrown in, and so on. E and F ([Fig. 158]) are two slide rods or spindles to steady the griffes or trap-boards when rising: G and G1 are bottom hole-boards to steady the cords; L is a clap-board for pressing back the needles instead of springs (it is fastened on springs I I, which hold it out a little from the needles, and these springs are fastened from the top by cords to the cylinder frame, which slides out with the cylinder, and draws in the clap-board, pressing forward all the needles). Now to mount this machine for double cloth. Suppose each frame to have 400 cords, and that there are 400 needles, the same as an ordinary 400-machine. Let the texture of the cloth be plain, and to work this 80 needles may be set off, leaving 320 for figuring. These 80 needles will be connected to 80 upright cords in the trap-board A, and the same in A1. The harness for the face cloth is tied to the remaining 320 cords in the trap-board a, and that for the back cloth to the 320 cords in the trap-board A1, and this portion of the harness works the figuring only without the texture. The texture is wrought by the 80 cords in each board connected to the first 80 needles. To each of these upright cords a number of harness twines are tied, one of which is fastened to each twine of the harness from the 320 cords, just above the cumber board; but in doing so the twines from the 80 hooks on the cords in the trap-board A must be connected with the twines of the harness from the trap-board A1, and the reverse for the other set. In this way all the back harness could be raised with either griffe, and the same with the front harness. Either griffe could raise one warp with the plain harness, and the other with the figuring harness. When cutting the cards plain texture is cut on each card for the first 80 needles, and the figuring portion without any texture is cut on the remainder of the card. The 80 cords open the texture or plain shed, and the 320 cords keep the two warps in their proper places, raising what should be above the weft, and leaving down what should be below it for each shot according to the pattern. In these mountings the cards hang over the side of the loom.
The same method of working can be applied to a jacquard with upright hooks, by having the heads of the hooks for each machine or set turned in opposite directions, as shown in [Fig. 160]. One set of hooks stand with their heads over the knives in the usual way, as at A, and the others require to be pushed back by the card to bring them over the knives, as shown at B, so that pushing any needle back pushes the front hook connected with it off the knife and the back one over the knife. The mounting may be made up as before, or a twill or any smaller texture may be used instead of plain; or a different texture may be made on face and back cloths.
Fig. 160
