111 W 155 SEWING MACHINE

The 111 W 155 sewing machine is a singleneedle, compound-feed sewing machine with alternating presser feet. This sewing machine makes the standard US 301 lockstitch and sews medium-heavy fabrics. It is equipped with a vertical-axis rotating hook. This sewing machine is classified as a rotory-type sewing machine and is also equipped with two presser feet; one is a vibrating presser foot, and the other one is a lifting presser foot. The front (vibrating) presser foot, the needle, and the feed dogs move in unison. Together they move the cloth away from the operator with each completed stitch. The rear (lifting) presser foot holds the fabric in place while the vibrating presser foot rises and moves forward to start the feeding action for another stitch. This sewing machine is capable of operating at a speed of 3500 stitches per minute (SPM). The stitch regulator provides a range of 3 1/2 to 32 stitches per inch (SPI).

The 111 W 155 is the same sewing machine in most ways as the 111 W 151, except for its alternating presser feet, which give the 111 W 155 a more positive feeding action. The 111 W 155 also has a longer stitch length (3 1/2 SPI instead of 5 SPI) and a higher maximum presser-foot lift (one-half inch instead of three-eighths inch). The 111 W 155 is an ideal sewing machine to use on medium-heavy fabrics such as vinyl and canvas.

This RTM will also include disassembly and assembly of the 111 W 155 sewing machine. To simplify minor repairs to this sewing machine and the 31-15 sewing machine, we have placed our discussion of disassembly and assembly to the rear of the chapter.

PREVENTIVE MAINTENANCE maintenance, you may use any approved cleaning solvent to clean the sewing machine.

If the sewing machine becomes sluggish, After you use a sewing machine, clean and an accumulation of dust and lint or a loose oil it. A clean and well-oiled sewing machine power belt may be the cause. To prevent the gives you many hours of trouble-free operation. buildup of dust and lint, you should cover the You may clean hard-to-reach places with a soft sewing machine when it is not in use. bristle brush or air pressure. Clean the outside of the sewing machine head, the oil pan, the CLEANING AND OILING machine stand, and the motor casing with a clean dust cloth or air pressure. Never use air

Before you attempt to oil or operate a new pressure above 25 psi for this purpose. sewing machine, clean it with diesel fuel. The diesel fuel removes any corrosion-protective NOTE: At least once a year, the machine lubricants that may have been placed on the should be thoroughly cleaned and oiled. Figures sewing machine at the factory. During normal 4-1 through 4-3 show the oiling points on the 111

Figure 4-1.-Front view of Model 225 sewing machine showing oiling points.

Figure 4-2.\Rear view of Model 225 machine showing oiling points.

W 155 sewing machine. Do not use too much oil; usually 1 drop of oil at each oiling point is sufficient. An excessive amount of oil will soil the project being sewn. We recommend a 10W mineral-base oil. (Use of castor-base oil is no longer required.) If this type of oil is not available through normal supply channels, use the mineral oil or Singer Type B or D.