SL-1110 S-7550A INSTRUCTION MANUAL HIGH SPEED SINGLE NEEDLE STRAIGHT LOCK STITCHER Please read this manual before using the machine. Please keep this manual within easy reach for quick reference.
Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety instructions and the explanations given in the instruction manual. With industrial sewing machines, it is normal to carry out work while positioned directly in front of moving parts such as the needle and thread take-up, and consequently there is always a danger of injury that can be caused by these parts.
SAFETY INSTRUCTIONS [1] Safety indications and their meanings This instruction manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe operation of this machine and to prevent accidents and injury to yourself or other people. The meanings of these indications and symbols are given below.
[2] Notes on safety CAUTION Environmental requirements Use the sewing machine in an area which is free from sources of strong electrical noise such as electrical line noise or static electric noise. Sources of strong electrical noise may cause problems with correct operation. Any fluctuations in the power supply voltage should be within ±10% of the rated voltage for the machine. Voltage fluctuations which are greater than this may cause problems with correct operation.
CAUTION Sewing This sewing machine should only be used by operators who have received the necessary training in safe use beforehand. If using a work table which has casters, the casters should be secured in such a way so that they cannot move. The sewing machine should not be used for any applications other than sewing. Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, injury may result.
[3] Warning labels The following warning labels appear on the sewing machine. Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are difficult to read, please contact your nearest Brother dealer. 1 2 Be sure to connect the ground. If the ground connection is not secure, you run a high risk of receiving a serious electric shock, and problems with correct operation may also occur.
CONTENTS 10. STANDARD ADJUSTMENTS............ 16 1. NAMES OF MAJOR PARTS................ 1 10-1. Adjusting the thread take-up spring ............... 16 2. MACHINE SPECIFICATIONS.............. 1 10-2. Adjusting arm thread guide R ........................ 17 10-3. Adjusting the presser foot height ................... 17 3. TABLE .................................................. 2 10-4. Adjusting of the feed dog height .................... 18 10-5. Adjusting the feed dog angle .........................
1. NAMES OF MAJOR PARTS 2. MACHINE SPECIFICATIONS 1. NAMES OF MAJOR PARTS 3826M 3827M (1) Needle plate (4) Pretension (7) Machine pulley (2) Presser foot (5) Spool pin (8) Reverse lever Safety devices (10) Finger guard (3) Needle bar (6) Stitch length dial (9) Bobbin winder (11) Thread take-up cover (12) Belt cover 2. MACHINE SPECIFICATIONS -3 For medium-weight materials 5,500rpm (Normal sewing speed: 5,000rpm) 4.2mm Use Max. sewing speed Max.
3. TABLE 4. MOTOR 3. TABLE Table processing diagram The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and with-stand the vibration of the sewing machine. Drill holes as indicated in the illustration below. Head rest hole Ground wire hole Motor mounting holes Cotton stand hole 3828M 4. MOTOR CAUTION All cords should be secured at least 25 mm away from any moving parts.
5. INSTALLATION 5. INSTALLATION CAUTION Machine installation should only be carried out by a qualified technician. Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done. The sewing machine weighs approximately 30 kg. The installation should be carried out by two or more people. Secure the table so that it will not move when tilting back the machine head. If the table moves, it may crush your feet or cause other injuries.
5. INSTALLATION 4. Machine head (1) Hinges [2 pcs] (2) Machine head (3) Head rest NOTE: Tap the head rest (3) securely into the table hole. If the head rest (3) is not pushed in as far as it will go, the machine head will not be sufficiently stable when it is tilted back. 3831M 5. Knee lifter plate (1) Knee lifter plate (2) Bolt * Loosen the bolt (2) and move the knee lifter plate (1) to a position where it is easy to use. 3832M 1.
5. INSTALLATION 6. V-belt (1) motor (Sold separately) (2) V-belt (Sold separately) * Turn the two nuts (3) to adjust so that there is 10 - 14 mm of deflection in the V-belt (2) when it is pressed at the midway point with a force of 5 N. 3836M 3837M 7. Bobbin winder 1. Push down the bobbin presser arm (1) as far as it will go. 2.
5. INSTALLATION 3. Return the machine head to its original position, and then remove the screw (4) from the rear of the machine head. 4. Align screw (1)-B with the groove (6) in belt cover U (5), and then place belt cover U (5) onto the machine pulley. 5. Tighten screws (1)-B, (1)-C and (4) to secure belt cover U (5). 3839M 3840M 6. Place belt cover D (7) so that it overlaps the belt cover (2) by 2 - 3 mm, and then provisionally tighten the two screws (8).
5. INSTALLATION 7. Insert the cover (9) of belt cover D (7) in between the belt cover (2) and belt cover D (7), and then place it into the groove of belt cover D (7). 8. Slide the cover (9) down along the groove of belt cover D (7) as far as it will go. 3842M 9. Pull belt cover D (7) toward you until there is no clearance between the belt cover (2) and the cover (9) of belt cover D (7). 10. Fully tighten the two screws (8). (Refer to step 6.) 3843M 9.
5. INSTALLATION 5-2. Ground wire connections Use the correct type of ground wire. (Be sure to read the instruction manual for the motor together with this instruction manual.) 1. Connect the ground wire (1) to the sewing machine head and motor. (The attachment location is indicated by a ground symbol (2).) 2. Connect the ground wire (3) to the oil pan (4) and motor. (The attachment location is indicated by a ground symbol (5).) Motor Motor 3845M 5-3.
6. PREPARATION BEFORE SEWING 6. PREPARATION BEFORE SEWING 6-1. Installing the needle CAUTION Turn off the power switch before installing the needle. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is depressed by mistake, which could result in injury. 1. Turn the machine pulley to move the needle bar (1) to its highest position. 2. Loosen the screw (2). 3.
6. PREPARATION BEFORE SEWING 6-3. Winding the lower thread CAUTION Do not touch any of the moving parts or press any objects against the machine while winding the lower thread, as this may result in personal injury or damage to the machine. 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 down the bobbin presser arm (3). 5.
6. PREPARATION BEFORE SEWING 6-5. Threading the upper thread CAUTION Turn off the power switch before threading the upper thread. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is depressed by mistake, which could result in injury. Turn the machine pulley and raise the thread take-up (1) before threading the upper thread.
7. SEWING 7. SEWING CAUTION Attach all safety devices before using the sewing machine. If the machine is used without these devices attached, injury may result. Turn off the power switch at the following times. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is depressed by mistake, which could result in injury.
8. THREAD TENSION 8. THREAD TENSION 8-1. Adjusting the thread tension CAUTION Turn off the power switch before removing or inserting the bobbin case. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work. The machine may operate if the treadle is depressed by mistake, which could result in injury.
8. THREAD TENSION 9. CLEANING 8-2. Adjusting the presser foot pressure Correct stitches 0894M 0895M Upper thread Skipped stitches occur Increase the pressure. 0896M Uneven stitch length Decrease the pressure. Stitches are puckered 0897M The presser foot pressure should be as weak as possible, but strong enough so that the material does not slip. Becomes weaker 1. Loosen the adjusting nut (1). 2. Turn the presser adjusting screw (2) to adjust the presser foot pressure. 3.
9. CLEANING 2126M 2183M 5. Tilt back the machine head. 6. Remove the bobbin case (4). 7. Wipe off any dust from the rotary hook (5) with a soft cloth, and check that there is no damage to the rotary hook (5). 8. Remove the bobbin from the bobbin case (4) and clean the bobbin case (4) with a cloth. 9. Insert the bobbin into the bobbin case (4), and then place the bobbin case (4) back into the machine. 2184M 10. Clean the oil sump (6) with a cloth. 11.
10. STANDARD ADJUSTMENTS 10. STANDARD ADJUSTMENTS CAUTION Maintenance and inspection of the sewing machine should only be carried out by a qualified technician. Turn off the power switch and disconnect the power cord from the wall outlet at the following times. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work.
10. STANDARD ADJUSTMENTS 10-2. Adjusting arm thread guide R Becomes greater The standard position of arm thread guide R (1) is the position where the screw (2) is in the center of the adjustable range for arm thread guide R (1). Becomes less * To adjust the position, loosen the screw (2) and then move arm thread guide R (1). ・ When sewing thick material, move arm thread guide R (1) to the left. (The thread take-up amount will become greater.
10. STANDARD ADJUSTMENTS 10-4. Adjusting of the feed dog height 3862M <-3> 0.8 mm <-5> 1.2 mm The standard height of the feed dog (1) when it is at its maximum height above the top of the needle plate is 0.8 mm for -3 specifications, and 1.2 mm for -5 specifications. 1. Turn the pulley until the feed dog (1) rises to the highest position. 2. Tilt back the machine head. 3. Loosen the screw (2). 4. Turn the feed lifting shaft crank (3) to move the feed bracket (4) up and down. 5. Tighten the screw (2).
10. STANDARD ADJUSTMENTS 10-6. Adjusting the needle bar height 2286M Reference line (a), which is the second line from the bottom of the needle bar (1)(fourth line from the bottom when using a DA x 1 needle) should be aligned with the lower edge of the needle bar bush D (2) as shown in the illustration when the needle bar (1) is at its lowest position. 1. Turn the machine pulley to set the needle bar (1) to its lowest position. 2. Remove the oil cap (3). 3.
10. STANDARD ADJUSTMENTS 10-8. Adjusting the needle and rotary hook timing 2290M 2291M 0.5 - 0.7mm The tip of the rotary hook (3) should be aligned with the center of the needle (4) when the needle bar (1) moves up from its lowest position to the position where reference line (b), which is the line at the bottom of the needle bar (1)(third line from the bottom when using a DA x 1 needle), is aligned with the lower edge of the needle bar bush D (2) as shown in the illustration. 1.
10. STANDARD ADJUSTMENTS 10-9. Adjusting the rotary hook lubrication amount CAUTION Be careful not to touch your fingers or the lubrication amount check sheet against moving parts such as the rotary hook or the feed mechanism when checking the amount of oil supplied to the rotary hook, otherwise injury may result. Use the following procedure to check the amount of oil being supplied to the rotary hook when replacing the rotary hook or when changing the sewing speed. 2303M Approx. 25mm Approx.
11. TROUBLESHOOTING 11. TROUBLESHOOTING Please check the following points before calling for repairs or service. If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting. The motor will keep turning even after the power is switched off as a result of the motor’s inertia. Wait until the motor stops fully before starting work.
11. TROUBLESHOOTING Problem 5 Possible cause Skipped stitches at sewing start Thread unravelling at sewing start 0749M 6 Uneven seam Is the thread take-up lever at its highest position at the sewing start? Set the thread take-up lever to its highest position at the sewing start. Is the length of the upper thread trailing from the needle hole too short? Pull about 50 mm of thread through the needle hole at the sewing start.
11. TROUBLESHOOTING Problem 9 Possible cause Lower thread is tangled at the sewing start. Lower thread 10 Page Is the bobbin spinning direction correct when the lower thread is being pulled? Set the bobbin so that it turns in the opposite direction to the rotary hook. Is there too much thread wound onto the bobbin? The bobbin winding amount should not be more that 80 %. Is the bobbin turning smoothly? If the bobbin is not turning smoothly, replace the bobbin.
INSTRUCTION MANUAL http://www.brother.com/ SL-1110, S-7550A SA8760-101 2007.06.
