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Brother International DA-9270 Instruction Manual - English - Page 16

Thread Tension

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7. THREAD TENSION 7. THREAD TENSION 7-1. Adjusting the thread tension Upper thread Good stitches Lower thread Upper thread Lower thread Loose, bad stitches Appearance of seam when upper thread tension is too weak Becomes weaker q Becomes stronger 1. Adjust the upper thread tension properly by turning upper thread adjusting screw q. 2. Adjust the lower thread tension properly by turning lower thread adjusting screw w. Becomes stronger w Becomes weaker 7-2. Presser foot pressure adjustment Becomes weaker Becomes Becomes stronger q stronger Becomes weaker w Adjust the presser foot pressure by turning presser adjusting screw q so that the pressure is just enough to feed the work positively and keep the work from slipping. * In case of Machines with puller the puller pressure can be adjusted as appropriate to the work by turning presser adjusting screw w. 11 DA-9270

Section	Page
Top cover	1
CONTENTS	5
1. NAMES OF MAJOR PARTS	6
2. MACHINE SPECIFICATIONS	6
3. WORK TABLE AND MOTOR	7
4. INSTALLATION	8
4-1. Installing the machine head	8
4-2. Ground wire connections	9
4-3. Installing the pulley cover	10
4-4. Belt tension adjustment	11
4-5. Cotton stand	11
4-6. Lubrication	12
4-7. Checking the machine pulley rotating direction	13
5. PREPARATION BEFORE SEWING	13
5-1. Needles and threads	13
5-2. Installing the needles	13
5-3. Threading the lower threads	14
5-4. Threading the upper threads	14
6. SEWING	15
6-1. Sewing	15
7. THREAD TENSION	16
7-1. Adjusting the thread tension	16
7-2. Presser foot pressure adjustment	16
7-3. Adjusting the stitch length	17
7-4. Puller feed adjustment (Machines with puller)	17
8. CLEANING	19
8-1. Daily cleaning	19
8-2. Changing the lubricating oil (every three months)	19
9. STANDARD ADJUSTMENTS	20
9-1. Needle bar height adjustment	20
9-2. Needle and looper timing adjustment	21
9-3. Timing of loopers running clear of needles	22
9-4. Needle guard adjustment	22
9-5. Feed dog height adjustment	23
9-6. Upper thread take-up thread guide adjustment	24
9-7. Upper thread arm thread guide adjustment	24
9-8. Thread release shaft adjustment	24
9-9. Lower thread take-up timing adjustment	24
9-10. Installing the lapper	25
9-11. Puller height adjustment (Machines with puller)	25
9-12. Puller timing adjustment (Machines with puller)	25
10. TROUBLESHOOTING	26