The purpose of the following information is NOT to make you an accomplished sewing machine expert and repairman. You should learn the basics about what makes your sewing machines work and how to perform routine maintenance and service. If you don’t, you will suffer needless frustration for simple problems, and it will cost you excessively in down time and service repair bills. The information on troubleshooting provides you with the basic knowledge needed to keep your machines running. Some individuals find that they have an affinity for repairing and maintaining sewing machines. For those of you who do not, cultivate relationships with these people carefully. They will be most valuable to you.

Figure 6-64 shows the front view of a modern lightduty single needle machine. The numbers correspond with the description.

  1. Machine head—This is the actual machine assembly.

  2. Table top—This holds the head in position and the motor underneath.

  3. Stand—This supports the table top.

  4. Motor—This powers the sewing machine.

  5. Treadle—This is the “gas pedal” which operates the motor. Pushing forward makes motor start and pushing backward stops the motor.

  6. On/off switch—Controls power to the motor.

  7. Thread stand—This holds the spools of thread for both the sewing machine and the bobbin winder.

  8. Bobbin winder—This feeds the thread to the bobbin during the winding process.

  9. Light—A good light is necessary to observe the sewing operation.

Figure 6-65 shows a closeup of the head only. Only those parts, which the rigger must deal with on a regular basis in order to operate and maintain the machine, are shown. For those individuals who wish to become more involved in the machine, a thorough study of the operator’s manual and parts manual is encouraged. The following numbers correspond with the part description.

1. Bed—The base of the machine.

2. Arm—The upper casing of the machine.

3. Uprise—The upright part of the machine that joins the base and the arm.

4. Faceplate—The cover that protects the needle bar and presser bar mechanisms.

5. Balance wheel—The pulley assembly that drives the machine via the motor and belt.

6. Reverse lever—The mechanism that, when depressed, reverses the sewing operation of the machine.

7. Stitch regulator—The adjustor that controls the length of the stitch. The larger the number, the longer the stitch, and the smaller the number, the shorter the stitch.

8. Pre-tension thread guide—The assembly that provides initial thread tension and thread straightening before the thread reaches the main upper thread tension assembly.

9. Thread retainer—Provides direct guidance for the thread to the upper tension assembly.

10. Thread take-up cover—Covers the thread take-up lever and protects the operator.

11. Right arm thread guide—Provides thread guidance from the upper tension assembly to the thread takeup lever.

12. Upper tension regulating thumbscrew—Regulates pressure of the tension discs on the thread.

13. Thread controller spring—Provides for the correct amount of slack in the needle thread when the needleis descending so that the needle does not cut the thread.

14. Tension discs—Provide tension on the upper thread.

15. Presser bar tension nut—Regulates the pressure of the presser foot on the material.

16. Thread take-up lever—Provides for slack in the needle thread after the stitch is formed and pulls the correct amount of thread from the spool for the next stitch.

17. Needle bar—Holds the needle and carries the upper thread downward through the material to where the stitch is formed. 18. Presser foot bar—Holds the presser foot in place to hold pressure on the material.

19. Presser foot—Holds the material in place while the feed dog moves the material forward for the next stitch.

20. Needle plate—Surrounds the feed dog and protects the material during the movement process.

21. Slide plate—Covers the area of the bed to the left of the feed dog and provides access to the bobbin assembly.

22. Feed dog—Feeds the material through the machine from the underside.

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