1. Introduction
This manual provides essential information for the safe and efficient operation, setup, and maintenance of your JUKI DDL-8700-Servo Industrial Straight Stitch Sewing Machine. Please read this manual thoroughly before using the machine to ensure proper function and longevity.
The JUKI DDL-8700-Servo is a high-performance single-needle, straight stitch industrial sewing machine designed for light to medium weight fabrics. It features a quiet servo motor for comfortable operation and precise stitching.
Figure 1.1: Overview of the JUKI DDL-8700-Servo Industrial Sewing Machine head.
2. Safety Information
Always observe the following safety precautions to prevent accidents and ensure safe operation:
- Power Disconnection: Always disconnect the power plug from the outlet before cleaning, oiling, or performing any maintenance.
- Needle Safety: Keep fingers away from the needle area during operation. Use appropriate needle guards if available.
- Proper Ventilation: Ensure adequate ventilation in the work area.
- Stable Surface: Operate the machine on a stable, level surface to prevent tipping.
- Children and Pets: Keep children and pets away from the machine during operation.
- Authorized Personnel: Only trained and authorized personnel should operate and maintain this industrial machine.
3. Setup
3.1. Assembly (If not pre-assembled)
The JUKI DDL-8700-Servo typically comes as a complete unit, including the machine head, table, stand, and motor. If your unit requires assembly, follow these general steps:
- Table and Stand Assembly: Assemble the table and stand according to the provided hardware and instructions. Ensure all bolts are securely tightened for stability.
- Motor Installation: Mount the servo motor underneath the table. Connect the motor to the machine head using the drive belt. Adjust belt tension as needed.
- Machine Head Placement: Carefully place the machine head into the cutout on the table. Secure it with the provided hinges and screws.
- Thread Stand Assembly: Assemble the thread stand and attach it to the back of the table.
- Light and Accessories: Install the sewing light and any other accessories (e.g., knee lifter, drawer) as per their specific instructions.
Figure 3.1: Fully assembled JUKI DDL-8700-Servo machine with table and thread stand.
3.2. Initial Setup and Oiling
Before first use, ensure the machine is properly oiled. The JUKI DDL-8700-Servo has an automatic lubrication system. Check the oil level in the oil pan located beneath the machine head. Fill with recommended sewing machine oil if the level is below the 'LOW' mark.
The machine is designed to be quiet and smooth due to its servo motor. Ensure the power switch is easily accessible.
4. Operating Instructions
4.1. Powering On/Off
Locate the power switch, typically on the underside of the table near the motor. Flip the switch to the 'ON' position to power the machine. To turn off, flip the switch to 'OFF'.
4.2. Bobbin Winding
The machine features a bobbin winder on the top right side of the machine head. Follow these steps to wind a bobbin:
- Place an empty bobbin onto the bobbin winder spindle.
- Guide the thread from the spool through the tension disc of the bobbin winder.
- Wrap the thread a few times around the bobbin.
- Push the bobbin winder unit towards the handwheel until it engages.
- Press the foot pedal to start winding. The winder will stop automatically when the bobbin is full.
4.3. Threading the Machine
Correct threading is crucial for proper stitch formation. Refer to the diagram on the machine head for the exact threading path. General steps include:
- Place the thread spool on the thread stand.
- Guide the thread through the upper thread guides.
- Pass the thread through the tension discs and around the take-up lever.
- Thread through the lower thread guides and finally through the needle eye from front to back.
- Insert the wound bobbin into the bobbin case and then into the shuttle hook assembly beneath the needle plate. Ensure the thread is correctly routed through the bobbin case tension spring.
Figure 4.1: Close-up view of the JUKI DDL-8700-Servo machine head, illustrating the upper threading path and tension adjustments.
4.4. Stitch Length Adjustment
The stitch length can be adjusted using the dial on the right side of the machine head. Rotate the dial to select the desired stitch length, typically ranging up to 5mm.
4.5. Sewing Operation
With the machine threaded and bobbin in place, lower the presser foot using the knee lifter or lever. Gently press the foot pedal to begin sewing. The servo motor provides precise speed control, allowing for slow, controlled stitching or high-speed production.
5. Maintenance
Regular maintenance ensures optimal performance and extends the life of your JUKI DDL-8700-Servo machine.
5.1. Cleaning
- Daily: Remove lint and dust from the needle plate, feed dogs, and bobbin area using a small brush.
- Weekly/Bi-weekly: Clean the entire machine surface. Remove the needle plate and clean thoroughly underneath, including the hook area.
5.2. Oiling
The machine has an automatic oiling system. Regularly check the oil level in the oil pan. The oil level should be between the 'HIGH' and 'LOW' marks. If it falls below 'LOW', refill with genuine JUKI sewing machine oil.
For specific oiling points not covered by the automatic system, consult a qualified technician or refer to detailed service manuals.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Skipped Stitches | Incorrect needle, bent needle, improper threading, incorrect needle insertion. | Use correct needle type (DB X 1, sizes 9-18), replace bent needle, re-thread machine correctly, ensure needle is fully inserted with flat side facing away from you. |
| Thread Breakage | Too much upper thread tension, burrs on needle plate/hook, poor quality thread, incorrect threading. | Adjust upper tension, check for and remove burrs, use good quality thread, re-thread carefully. |
| Uneven Stitches | Incorrect tension settings (upper or bobbin), worn feed dogs, inconsistent fabric feeding. | Adjust tension, inspect feed dogs, ensure consistent fabric feeding. |
| Machine Not Starting | Power not connected, power switch off, motor issue. | Check power connection, ensure switch is ON, consult technician if motor issue suspected. |
For issues not listed, or if problems persist, contact a qualified JUKI service technician.
7. Specifications
- Model: JUKI DDL-8700-Servo
- Type: Single-needle, Straight Stitch, Industrial Sewing Machine
- Max. Sewing Speed: 5500 stitches/minute
- Max. Stitch Length: 5mm
- Needle System: DB X 1
- Recommended Needle Sizes: 9-18
- Motor: Servo Motor (110V)
- Unit Dimensions (LxWxH): Approximately 48 inches x 20 inches x 48 inches (assembled)
- Item Weight: 28 pounds (machine head only)
- Suitable Fabrics: Light to Medium Weight
