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7. THREAD TENSION

14

DA-927A, DA-928A

7. THREAD TENSION

7-1. Adjusting the thread tension

1. Adjust the upper thread tension properly by turning the

tension nut (1).

2. Adjust the lower thread tension properly by turning the

tension nut (2).

7-2. Presser foot pressure adjustment

Adjust the presser foot pressure by turning the adjusting screw
(1) so that the pressure is just enough to feed the work positively
and keep the work from slipping.

Good stitches

Loose, bad stitches
Appearance of seam when upper thread
tension is too weak

1494B

4264B

Becomes
weaker

Upper thread

Lower thread

Lower thread

Upper thread

Becomes weaker

Becomes stronger

Becomes
stronger

4265B

Becomes
weaker

Becomes
stronger

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Содержание DA-927A

Страница 1: ...27A DA 928A Please read this manual before using the machine Please keep this manual within easy reach for quick reference TWIN NEEDLE THREE NEEDLE FEED OFF THE ARM DOUBLE CHAIN STITCHER INSTRUCTION MANUAL ...

Страница 2: ...ual 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 Indications CAUTION The instructions which follow this term indicate situations where failure to follow the instructions may result in mino...

Страница 3: ...er cord from the wall outlet Lightning may cause problems with correct operation Installation 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 49 kg 108lb The installation should be carried out by two or more people Do not connect ...

Страница 4: ... 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 may result in injury Be sure to wear protective goggles and gloves when handling the lubricating oil so that it does not get into your eyes or onto your skin If care is not taken inflammation can result Furthermore do not drink the lubri...

Страница 5: ... 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 3 Direction of operation 4 Safety devices A Finger guard B Thread take up cover C Pulley cover etc ...

Страница 6: ...DA 927A DA 928A v 4284B Oil tank ...

Страница 7: ...G 13 6 1 Sewing 13 7 THREAD TENSION 14 7 1 Adjusting the thread tension 14 7 2 Presser foot pressure adjustment 14 7 3 Adjusting the stitch length 15 8 CLEANING 16 8 1 Daily cleaning 16 8 2 Changing the lubricating oil every three months 16 9 STANDARD ADJUSTMENTS 17 9 1 Needle bar height adjustment 17 9 2 Adjusting the looper rocking movement and forward back movement 18 9 3 Needle and looper timi...

Страница 8: ... 927A DA 928A 1 NAMES OF MAJOR PARTS 1 1 NAMES OF MAJOR PARTS 1 Machine pulley 4 Needle bar 2 Front cover 5 Lapper 3 Presser foot Safety devices 6 Thread take up cover 7 Finger guard 8 Pulley cover 4243B ...

Страница 9: ...terials Heavy materials Extra heavy materials Max sewing speed sti min 4 000 Max stitch length mm 3 8 4 7 Needle gauge 2 needles 3 16 3 16 3 16 1 4 1 4 3 needles 1 8 x 2 1 8 x 2 Needle type Organ TV x 64NY SCHMETZ TV x 5 Needle count 12 14 16 130 140 Arm size 171 When the thread breaks due to heat at a speed of 4 000 sti min sewing reduce the sewing speed Specifications Specifications 4244B 4245B ...

Страница 10: ... The top of the table should be 40 mm in thickness and should be strong enough to hold the weight and withstand the vibration of the sewing machine Drill holes as indicated in the illustration below A Chain hole B Motor mounting holes 3 places C Cotton stand hole D Ground hole 4246B ...

Страница 11: ...all the correct belt cover which corresponds to the motor being used Motor Use a 400 watt 2 pole clutch motor Refer to the instruction manual for the motor for details on installing and using the motor Motor pulley and V belt For details on the relationship between the motor pulleys and belts refer to the table below The belt should be an M type V belt Pulley O D 65 70 75 80 85 90 95 100 Belt size...

Страница 12: ...n is not secure you run a high risk of receiving a serious electric shock and problems with correct operation may also occur Install the pulley cover to the machine head Cautions regarding table and legs When installing the legs to the table adjust the heights of the legs so that the machine head can be set up horizontally If the machine head is not horizontal it will adversely affect the lubricat...

Страница 13: ...ctions by aligning it with the belt hole 5 3 Install the two mounting plates 6 to the machine bed 1 and the pulley cover base 2 with the two set screws 7 4 Secure the two collars 8 the four rubber cushions 9 and the two washers 10 to the table with the two screws 11 as shown in the illustration 5 Connect the presser foot lifter chain 4 to the knee lifter lever 12 and the foot lifter pedal 13 4249B...

Страница 14: ... 3 Connect the ground wire 2 to the motor in accordance with the instructions in the instruction manual for the motor 4 3 Installing the pulley cover 1 Place the belt 2 onto the machine pulley 1 Pull the belt 2 upward when installing the pulley cover A 3 2 Place the pulley cover A 3 so that it is in between the eight pulley cover sheets 4 and then secure it to the pulley cover base with the four s...

Страница 15: ... Turn the nuts 4 to adjust so that there is 20 30 mm of deflection in the V belt 3 when it is pressed at the midway point with a force of 9 8 N 4 5 Assembling the cotton stand 1 Assemble the cotton stand while referring to the instruction manual for the cotton stand 2 Install the cotton stand to the table with the nut 1 1477B 1478B ...

Страница 16: ...of lubricating oil is difficult to obtain the recommended oil to use is Exxon Mobil Essotex SM10 VG10 1 Open the front cover 1 remove the rubber cap 2 and then fill with oil until the oil level reaches the point in between the upper reference line A and the lower reference line B on the oil gauge 3 If the oil level drops to the lower reference line B be sure to add more oil 2 Insert the rubber cap...

Страница 17: ...d plug into the wall outlet and then turn on the power switch 2 Depress the treadle slightly and check that the machine pulley 1 starts to turn in the direction of the arrow A If the direction of rotation is reversed change the direction of rotation to the correct direction while referring to the instruction manual for the motor For the first 3 4 days of use run the machine at 500 sti min lower th...

Страница 18: ...30 Spun yarn 30 TV x 64 22 Organ TV x 5 140 SCHMETZ Spun yarn 20 Spun yarn 30 5 2 Installing the needles CAUTION Turn off the power switch before installing the needle However 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 m...

Страница 19: ...before starting work The machine may operate if the treadle is depressed by mistake which may result in injury 5 4 Threading the upper threads CAUTION Turn off the power switch before threading the upper thread However 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 ...

Страница 20: ...mistake which may result in injury When threading the needle When replacing the needle When not using the machine and when leaving the machine unattended Do not touch any of the moving parts or place any objects against the machine while sewing as this may result in personal injury or damage to the machine 6 1 Sewing 1 Turn on the power switch 2 Depress the foot lifter pedal 1 and place the work u...

Страница 21: ... foot pressure adjustment Adjust the presser foot pressure by turning the adjusting screw 1 so that the pressure is just enough to feed the work positively and keep the work from slipping Good stitches Loose bad stitches Appearance of seam when upper thread tension is too weak 1494B 4264B Becomes weaker Upper thread Lower thread Lower thread Upper thread Becomes weaker Becomes stronger Becomes str...

Страница 22: ...feed adjustment button 2 will move further inward 3 While still pressing the feed adjustment button 2 keep turning the machine pulley 3 The higher the value of the numeral the larger the stitch length becomes 4 Release the feed adjustment button 2 Check that the feed adjustment button 2 has returned 5 Adjust the needle guard Refer to 9 5 Needle guard adjustment 6 Close the front cover 1 NOTE Do no...

Страница 23: ...on can result Furthermore do not drink the lubricating oil Diarrhea or vomiting may result Keep the oil out of the reach of children 8 1 Daily cleaning Cleaning the machine 1 Open the looper cover 1 and clean away any thread scraps and other rubbish 2 After cleaning close the looper cover 1 Lubrication Refer to 4 6 Lubrication Checking 1 Check that the threads are threaded correctly Refer to 5 3 T...

Страница 24: ... heights of the needles 1 At this time adjust so that each needle 1 is in the center of the needle hole 3 in the needle plate 2 1 Remove the screw 4 and then remove the presser foot 5 2 Turn the machine pulley to raise the needle bar to its highest position 3 Remove the three screws 6 and then remove the face plate 7 and the face plate packing 8 and loosen the screw 9 of the needle bar clamp 4 Mov...

Страница 25: ...no longer visible in the hole when the set screw at the rear relative to the forward back cam turning direction is aligned with the adjustment hole 4 in the cam sleeve To adjust loosen the set screw which is at the front relative to the forward back cam turning direction and then loosen the set screw at the rear just enough so that the forward back cam can be adjusted 3 After adjusting tighten the...

Страница 26: ...ley 5 toward you to set the looper 1 so that its eye is aligned with the middle of the needle 2 during its forward travel 6 Loosen the two set screws 9 of the lower belt wheel 8 7 While holding the looper 1 so that the eye of the looper 1 does not move from the middle of the needle 2 turn the machine pulley 5 to raise or lower the needle 2 If the needle height during the looper forward travel is t...

Страница 27: ...ooper holder 5 to align the tip of the looper 1 is at the middle of the needle in the left right direction Also set to that there is a gap of 0 05 to 0 1 mm for the 927A or so that the tip pushes the needle by 0 1 to 0 2 mm for the 928A in the forward back direction and then tighten the bolt 6 of the looper holder 5 Check that the difference in height between the top edge of the needle hole and th...

Страница 28: ... and the needle 2 tip is 1 mm 4 Tighten the set screw 4 5 Loosen the set screw 5 and then move the needle guard 3 to the left or right to adjust so that the clearance between the needle 2 and the needle guard 3 is 0 2 mm for the 927A or so that the clearance between the needle 2 and the tip of the looper 1 is 0 to 0 05 mm when the needle guard 3 is pushing the needle 2 for the 928A 6 Tighten the s...

Страница 29: ...2 Place the spacer 1 under the sub feed dog 2 and retighten the two screws 3 The spacer 1 is inserted into the accessory part 9 7 Upper thread take up guide adjustment Adjust so that the distance from the center of the upper thread take up hole 1 to the top edge of the upper thread take up guide 2 is at the distance shown in the illustration when the needle bar reaches its lowest position 1 Turn t...

Страница 30: ...t by turning the tension release shaft 2 so that the tension discs begin to loosen when the presser foot rises 1 3 mm above the top of the needle plate 3 After the adjustment retighten the set screw 1 securely 9 10 Lower thread take up timing adjustment Adjust so that the lower thread take up 1 touches the thread 2 when the looper starts its backward travel 1 Insert the screwdriver through the adj...

Страница 31: ... the forward feed arm cover making sure that the end of the lapper is clear of the presser foot Lapper adjustment Adjust felling distance of point A by loosing the screw 1 After the adjustment retighten the screw 1 Adjust felling distance of point B by losing the two screws 2 After the adjustment retighten the two screws 2 4282B 1534B ...

Страница 32: ...st the upper thread tension 14 The lower thread tension is too strong Adjust the lower thread tension 14 The position of the upper thread take up guide is incorrect Adjust the upper thread take up guide position correctly 22 The position of the upper thread guide is incorrect Adjust the upper thread guide position correctly 23 2 Skipped stitches occur while sewing The needle is not properly instal...

Страница 33: ...oles are too small for threads Check the needle and thread counts 11 The loopers are damaged Smooth the loopers with an oiled grindstone or replace the damaged parts 20 6 Broken needles The material is being pushed or pulled with excessive force during sewing Do not push or pull the material with excessive force The needle is not properly installed Install the needle correctly 11 The needle tip is...

Страница 34: ...tries Ltd All Rights Reserved This is the original instructions DA 927A DA 928A I8031207B E 2018 03 B 1 Please note that the contents of this manual may differ slightly from the actual product purchased as a result of product improvements ...

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