Cutex Upper Looper Instruction Manual

1. Product Overview

This manual provides essential information for the installation, operation, and maintenance of the Cutex Upper Looper, designed as a replacement part for specific Juki industrial overlock sewing machines. This component is crucial for forming the upper loop in overlock stitching.

An image showing the Cutex Upper Looper, a curved metal component designed for industrial overlock sewing machines. The looper has a hook-like end and a mounting base.

2. Compatibility

The Cutex Upper Looper (Juki Part #: B2520-352-000, Cutex Model #: 795821103) is compatible with the following Juki industrial overlock sewing machine models:

• Juki MO-352
• Juki MO-357

Ensure your machine model matches one of the listed compatible models before installation.

3. Setup and Installation

Warning: Always disconnect the sewing machine from the power supply before performing any installation or maintenance procedures. Refer to your Juki machine's primary instruction manual for detailed safety guidelines and specific machine diagrams.

1. Preparation: Turn off and unplug the sewing machine. Open the front cover to access the looper area.
2. Remove Old Looper: Carefully locate the existing upper looper. Using an appropriate screwdriver, loosen the screw(s) that secure the looper in place. Gently remove the old looper, noting its exact position and orientation.
3. Install New Looper: Position the new Cutex Upper Looper in the same orientation as the one removed. Ensure it seats correctly into its designated slot.
4. Secure Looper: Tighten the securing screw(s) firmly, but do not overtighten, as this can damage the looper or the machine.
5. Check Alignment: Manually turn the machine's handwheel to observe the looper's movement. Verify that it moves freely and aligns correctly with the needles and lower looper according to your machine's specifications. Adjust if necessary.
6. Close Cover: Once satisfied with the installation and alignment, close the machine's front cover.

4. Operating Considerations

After installing the new upper looper, it is recommended to perform a test stitch on scrap fabric to ensure proper function and stitch quality. Pay attention to:

• Thread Path: Ensure the upper looper is threaded correctly according to your Juki machine's threading diagram. Incorrect threading can lead to skipped stitches or thread breakage.
• Tension Settings: Minor adjustments to upper looper thread tension might be required after replacing the looper to achieve balanced stitches.
• Stitch Quality: Observe for consistent loop formation, even stitches, and absence of loose threads or puckering.

5. Maintenance

Regular maintenance of your sewing machine, including the looper, ensures optimal performance and extends the lifespan of the part.

• Cleaning: Periodically clean lint and thread debris from around the looper and its mounting area using a small brush or compressed air. Accumulation of debris can hinder movement and affect stitch quality.
• Lubrication: Refer to your Juki machine's manual for specific lubrication points and frequency. Ensure the looper's pivot points are adequately oiled if recommended.
• Inspection: Regularly inspect the looper for any signs of wear, bending, or damage. A worn or damaged looper can cause skipped stitches, thread breakage, or uneven seams. Replace if necessary.

6. Troubleshooting

If you encounter issues after installing the new upper looper, consider the following common problems and solutions:

• Skipped Stitches:
  • Check looper alignment with needles.
  • Verify correct threading of the upper looper.
  • Ensure needles are correctly inserted and not bent or dull.
• Thread Breakage:
  • Inspect the looper for burrs or rough spots that could snag thread.
  • Check thread tension; it might be too high.
  • Ensure thread quality is appropriate for industrial machines.
• Uneven Stitches/Loose Loops:
  • Adjust upper looper thread tension.
  • Confirm the looper is securely fastened and not loose.

For persistent issues, consult a qualified sewing machine technician or refer to your Juki machine's comprehensive service manual.

7. Specifications

• Part Type: Upper Looper
• Brand: Cutex
• Juki Part Number: B2520-352-000
• Cutex Model Number: 795821103
• Compatible Machine Models: Juki MO-352, Juki MO-357
• Material: Industrial-grade metal alloy

8. Warranty and Support

For information regarding warranty coverage for your Cutex Upper Looper, please refer to the original purchase documentation or contact your retailer. For technical support or further assistance, please reach out to Cutex customer service through their official website or contact information provided at the point of purchase.