Shop Area: Textiles
Tool: Brother Industrial Sewing Machine
Requires in-person training: Yes
UG 140-01, Rev. 1
Brother Industrial Sewing Machine Model S7200-A-405
SINGLE NEEDLE DIRECT DRIVE STRAIGHT LOCK STITCHER WITH THREAD TRIMMER
- Always wear approved safety glasses or face shield while operating the equipment.
- Before operating equipment, remove tie, rings, watches and other jewelry, and roll sleeves up past the elbows. Remove all loose clothing and confine long hair.
- Non-slip footwear or anti-skid floor strips are recommended.
- Closed toe shoes are required when working in a shop area.
- Do not wear gloves while operating the equipment.
- Make all machine adjustments or maintenance with the machine unplugged from the power source.
- Always power off machine when not in use.
- A sewing machine should never be left unattended when plugged in. Always unplug this sewing machine from the electric outlet immediately after using and before cleaning.
- Always unplug before relamping. Replace bulb with same type rated 15 Watt (for model 116).
- Keep fingers away from all moving parts. Special care is required around the sewing machine needle.
- Always use the proper needle plate. The wrong plate can cause the needle to break.
- Do not use bent needles.
- Do not pull or push fabric while stitching. It may deflect the needle causing it to break.
- Switch the sewing machine off (“0”) when making any adjustment in the needle area, such as threading needle, changing needle, threading bobbin, or changing presser foot, etc.
- Always unplug sewing machine from the electrical outlet when removing covers, lubricating, or when making any other user servicing adjustments mentioned in the instruction manual.
- Turn off the power switch at the following times.
- When threading the needle
- When replacing the bobbin and needle
- When not using the machine and when leaving the machine unattended
- The machine may operate if the treadle is depressed by mistake, which could result in injury.
Tilting back the machine head: Hold section (B) with your foot so that the table does not move, and then push the arm with both hands to tilt back the machine head.
Returning the machine head to the upright position:
1. Clear away any tools, etc. which may be near the table holes.
2. While holding the face plate with your left hand, gently return the machine head to the upright position with your right hand.
PREPARATION BEFORE SEWING:
Installing the needle:
1. Turn the machine pulley to move the needle bar to its highest position.
2. Loosen the screw (1).
3. Insert the needle (2) in a straight line as far as it will go, making sure that the long groove on the needle is at the left, and then securely tighten the screw (1).
Removing the bobbin case:
1. Turn the machine pulley to raise the needle until it is above the needle plate.
2. Pull the latch (1) of the bobbin case upward and then remove the bobbin case.
3. The bobbin (2) will come out when the latch (1) is released.
4. There is an anti-spin spring (3) inside the bobbin case. The anti-spin spring (3) prevents the bobbin from racing at times such as during thread trimming.
5. Use bobbins (2) made of light alloys.
Winding the lower thread:
1. Turn on the power switch.
2. Place the bobbin (1) onto the bobbin winder shaft (2).
3. Wind the thread several times around the bobbin (1) in the direction indicated by the arrow.
4. Push the bobbin presser arm (3) toward the bobbin(1).
5. Raise the presser foot with the lifting lever.
6. Depress the treadle. Lower thread winding will then start.
7. Once winding of the lower thread is completed, the bobbin presser arm (3) will return automatically.
8. After the thread has been wound on, remove the bobbin and cut the thread with the knife (4).
9. * Loosen the screw (5) and move the bobbin presser (6) to adjust the amount of thread wound onto the bobbin.
10. The amount of thread wound onto the bobbin should be a maximum of 80 % of the bobbin capacity.
Installing the bobbin case:
1. Turn the machine pulley to raise the needle until it is above the needle plate.
2. While holding the bobbin so that the thread winds to the right, insert the bobbin into the bobbin case.
3. Pass the thread through the slot (1) and under the tension spring (2), and then pull it out from the thread guide (3).
4. Check that the bobbin turns clockwise when the thread is pulled.
5. Hold the latch (4) on the bobbin case and insert the bobbin case into the rotary hook.
Threading the upper thread: Turn the machine pulley and raise the thread take-up (1) before threading the upper thread. This will make threading easier and it will prevent the thread from coming out at the sewing start.
Adjusting the stitch length:
1. Push the dial lock lever (1) up until it clicks to release the lock.
2. Turn the stitch length dial (2) clockwise or counterclockwise so that the desired stitch length is at the uppermost position on the dial.
- The larger the number, the longer the stitch length will be.
- The numbers on the dial are for use as a guide. The length of the finished stitches may vary depending on the type and thickness of material being sewn. Adjust while looking at the finished stitches.
- When turning the stitch length dial (2) from a larger setting to a smaller setting, it will be easier to turn the dial if the reverse lever (3) is pushed to the half-way-down position.
3. Push the dial lock lever (1) down firmly to lock it.
4. Check that the stitch length dial (2) does not rotate.
Using the thread wiper: Press the thread wiper switch (1) to the side. If this is done, the thread wiper (2) will operate after the thread is trimmed.
Using the knee lifter: The presser foot (2) can be raised by pressing the knee lifter plate (1).
USING THE OPERATION PANEL – see Instruction Manual https://www.brothercom.ro/docs/2-Partsbook%20-%20carti%20piese%20de%20schimb/Seria%20BROTHER%20B700/S7200A/S-7200A%20instruction%20manual.pdf for:
- Names and functions – Basic Operations
- Sewing start and end backtack stitches
- Sewing fixed stitches
- Sewing name labels
- Sewing pleat presser stitches
- Using the lower thread counter
- Adjusting the needle up stop position
- LOCK key
- Resetting all settings to their defaults
1. Press the ON power switch. The power indicator will illuminate.
2. Use the operating panel to carry out the programming which is necessary for sewing.
3. Depress the treadle to start sewing.
Backtacking: When the actuator (1) or the reverse lever (2) is pressed during sewing, the feed direction will be reversed. When it is released, the feed direction will return to normal.
Sewing condensed stitches:
- If you press the actuator (1) or the reverse lever (2) while sewing is in progress, you can sew stitches (forward direction) with small stitch lengths.
- Before carrying out sewing, set the stitch length for condensed stitches as follows.
1. Lift up the dial lock lever (3) to release the lock.
2. Turn the stitch length dial (4) to the stitch length to be used for condensed stitches.
3. Tilt back the machine head.
4. Loosen the nut (5) and then turn the bolt (6) until its head is touching the solenoid lever (7).
5. Tighten the nut (5) to secure the bolt (6).
6. Return the machine head to its normal position.
1. Return the stitch length dial (4) to the stitch length for normal sewing.
2. Push down the dial lock lever (3) to engage the lock.
3. Start sewing.
4. At the position where you would like to start sewing condensed stitches, press the actuator (1) or the reverse lever (2).
5. Condensed stitches are sewn while the actuator (1) or reverse lever (2) is being pressed.
6. * To stop sewing condensed stitches, tighten the bolt (6) so that its head is not touching the solenoid lever (7).
Adjusting the thread tension:
<Lower thread tension>
Adjust by turning the adjustment screw (1) until the bobbin case drops gently by its own weight while the thread end coming out of the bobbin case is held.
<Upper thread tension>
After the lower thread tension has been adjusted, adjust the upper thread tension so that a good, even stitch is obtained.
1. Lower the presser foot.
2. Adjust by turning the tension nut (2).
Adjusting the presser foot pressure:
The presser foot pressure should be as weak as possible, but strong enough so that the material does not slip.
1. Loosen the adjusting nut (1).
2. Turn the presser adjusting screw (2) to adjust the presser foot pressure.
3. Tighten the adjusting nut (1).
Adjusting the trailing length after thread trimming:
- At the time of thread trimming, the thread tension is loosened and tension is applied by the pretension (1) only.
- The standard trailing length for the upper thread is 35–40 mm.
- If the tension of the pretension (1) is increased, the lengths of the threads trailing from the needle tips will be reduced; if the tension is reduced, the lengths will be increased.
- Adjust by turning the pretension (1).
Error code displays: If an error code appears on the operation panel display
1. Make a note of the error code and then turn off the power.
2. After the operation panel display has turned off, eliminate the cause of the error and then turn the power back on.
Items with a “*” in the “Page” column should only be checked by a qualified technician.
END OF THE PROCEDURE