The Outer Workings of the Machine. There are five distinct methods of operating the movable parts of the machine: First, top or overhead lever lift and independent batten or swing cylinder motion; second, overhead lever and spindle cylinder motion; third, overhead lever and independent slide cylinder motion; fourth, bottom or cradle lever lift, and independent spindle cylinder motion; and fifth, bottom or cradle lever lift and spindle cylinder motion.
The first method is illustrated by Fig. [15]. It consists of a lever at the top of the machine, or in some instances suspended from the beam that supports the ceiling. The inner end of the lever is connected by a link to the crossbar of the griffe. This must be fixed exactly in the center of the crossbar so as to give a straight lift to the griffe. To the outer end of the lever, a long driving rod is attached. The bottom end of the driving rod is placed on a stud attached to the hand wheel, which is fixed on the crank shaft of the boom when the machine is a single lift. The overhead lever is from thirty-six to forty inches long, according to the width of the loom. On the thirty-six inch lever the inner end, which is attached to the crossbar from the link to the supporting stud, fixed in the bracket attached to the framework of the machine, is about ten and one-half inches long, and the longer end, which is attached to the lifting rod, is twenty-four to twenty-five and two-thirds inches long. The throw from the center of shaft to the stud fixed to the hand wheel is four inches. This gives an eight inch stroke on the hand wheel.
10½ × 8 = 3⅓ inches
25
Allowing for the fall of the griffe below the bend of the hook the movement will give about a three-inch shed in the harnesses.
The batten or swing cylinder movement is shown in detail in Fig. [16]. It is composed of five distinct parts as follows:
(a) Two small arms are fixed at the top of the machine, one at each side. Two pointed set screws with lock nuts are set in the arms and the batten or swing is supported on these points.
(b) The batten, which is in the form of a square iron frame.
Fig. 16. Details of Batten or Swing Cylinder Motion.