Timing the 111 W Class Sewing Machines

The first step in timing the 111 W machine is to set the feed driving eccentric on zero stitches per inch (0 spi). Set the needle bar. With the needle bar in its lowest position (needle bar crank in the horizontal position, the rounded portion on the top and driving stud at the bottom), the connecting link will be vertical. Set the needle bar with the upper timing mark just visible at the base of the needle bar rock frame, and tighten the needle bar pinch screw. The needle bar is then properly set.

To set a needle bar that has no mark, set the feed eccentric for eight stitches to the inch. Then set the needle bar so that when it rises 3/32 inch from its lowest position and the point of the sewing hook is at the center of the needle, the needle eye will be about 1/16 inch below the hook point.

The next step is to time the arm shaft with the hook drive shaft. With the connection belt removed, rotate the balance wheel toward the operator until the thread take-up lever is at its highest point, then aline the arrow on the hook drive shaft collar with the timing plate arrow, and replace the connection belt. Rotate the balance wheel and check. The next step is to center the

feeding action. For this step the feed driving eccentric must be set on zero spi. With the needle entering the feed dog, center the needle in the hole

in the feed dog with a distance of 17/32 inch between the needle bar and the presser bar.

In centering the feeding action, the following sequence should be followed: Hold the needle centered in the feed dog with a 17/32-inchspace between the needle bar and presser bar. Tighten the feed driving crank and feed driving rockshaft crank pinch screws, making sure that the crank is flush with the end of the feed driving rockshaft and parallel with the bed. Next, tighten the needle bar rock frame rockshaft crank pinch screw in the back of the uprise. The shank of the presser foot is 17/32 inch wide and may be used for measuring the space.

The next step is to set the sewing hook to or from the needle. This is done by moving the hook saddle left or right as necessary; the hook should pass the needle as closely as possible without touching. When this is done, retighten the hook saddle screws. Next, set the sewing hook with the needle. With the needle bar on the upstroke, the lower timing mark on the needle bar should be just visible at the base of the needle bar rock frame. Set the point of the sewing hook in the center of the needle 1/16 inch above the eye. To advance the sewing hook, move the hook drive gear to the right; and to retard, move the hook drive gear to the left.

NOTE: The first screw in the hook pinion gear and the second screw in the hook drive gear are splined screws. The hook drive gear must be centered in relation to the sewing hook shaft at the bottom of the hook saddle. "

Lubrication of The Class 111 Sewing Machines

Figures 9-24A, 9-25B, and 9-26 show the various lubrication points on class 111 sewing machines. Oiling points are indicated by the unnumbered arrows. Familiarization with the nomenclature of the machines may also be accomplished by studying these illustrations.

To lubricate the class 111 machine, swing back the top cover and oil the bearings, then replace the cover.

Loosen the thumbscrew in the upper end of the faceplate, turn the faceplate upward, and oil the wick and bearings, as shown in figure 9-25B. After oiling, turn down the faceplate and tighten the thumbscrew.

Turn the machine back on its hinges and apply oil at the places designated by the arrows in figure 9-27. All contacting parts on the bottomside of the machine should also be oiled.

To lubricate the hook, remove the bed slide and place oil in the oil well (fig. 9-26). This

Figure 9-26.-Rear of machine, showing oiling points. 9-22

Figure 9-27.-Base of machine, showing oiling points.

lubricates the upper hook bearing and the mechanical opener mechanism.

The small, green felt pad on the side of the bobbin case should be kept wet with oil to lubricate the hook race. When this pad is wet, it appears nearly black; when it appears light green, it indicates that it is dry. When a machine is new, oil should be applied to this felt pad EACH TIME A BOBBIN IS REPLACED.