Marking Motion.
To enable the weaver to finish the piece when a required length has been woven the warp is marked at the sizing frame at a certain length. This is generally done for plain goods by means of a measuring roller 14·4 inches in circumference, round which the twist passes. On the end of this is a tin roller wheel driving a change wheel or stud wheel. By means of a worm on the same stud the motion is transferred to a bell wheel of 45 teeth, which drives a marking cam so arranged as to gradually lift and suddenly drop a hammer, which smits the warp against a block soaked in some colouring matter.
To get the wheels for a certain length, say the stud wheel, multiply the length of mark desired in inches by tin roller wheel, and divide by the bell wheel and the circumference of tin roller.
FIG. 17.—DHOOTIE MARKER.
To get the tin roller wheel, multiply the circumference of measuring roller by bell wheel and by stud wheel, dividing by length of mark required. To prove this the length of mark may be obtained from the wheels, say stud wheel 105 and tin roller wheel 45.
(14·4 × 45 × 105) / 45 = 1512 inches, or 42 yards.
In marking dhooties, in addition to the smit for the end of the piece, additional smits have to be made where the heading for each scarf has to be inserted. Usually this is done by having an additional train of wheels and an extra marker, called a dhootie-marker, to strike 3, 4, or 6, etc., times for the cut-marker’s once. In [Fig. 17] a special arrangement is shown. The usual wheels are shown at h, the worm i, the bell wheel k, the bell shaft cut-mark hammer m. The other wheels and the marker n refer to the dhootie mark; b is fixed to the stud and drives c with d, a pinion on another stud; the wheels e, f and g complete the train, and on the same shaft as g a cam o operates the dhootie-marker. This is arranged to strike any number of times for once of the cut-marker, regulated by the number of teeth in the change wheel f, 10 teeth in which give one mark to a cut mark, 30 give three marks to a cut, 100 ten marks to a cut, and so on by somewhat similar systems for higher numbers.