Brother Db2-b714-3 Instruction Manual

11] Thread tension  release lever 
mechanism 
(8707 /8716/8747) 
* When trim signal is input.  the trimmer solenoid 0 
functions.  the tension  release plate 8 pushes the 
tension  release 
bar 8 via the  tension  release lever 
8 and the tension  release wire 0 and opens the 
tension  disc. 
When the needle upper stop signal is input, current 
no longer flows to the thread trimmer solenoid, and 
the tension disc closes. 
[!] Quick-back  mechanism 
0 
• 
• 
* When the quick-back  switch is pressed, the...

CDISASSEMBLY -~ 
I. Loosen the set screw 8 and remove  the needle G. (Loosen  the set and remove  the thread  wiper.) 
2. Remove  the three  screws 0. and then remove  the face  plate 8 and the packing 0. 
3. Remove  the five  screws 0 and then  remove  the side  cover 0. 
4. Remove  the two  screws 0. and then  remove  the oil stopper plate 0. 
5. Remove  the oil cap Gi) and the oil cap CD. 
6. Loosen  the set screw CB and remove  the tension  regulator  assembly •. 
7. Remove  the slide  plate e. 
8....

!., 
[I) Rotary hook 
f) 
~~~"L,..~~-· 
r---"\:'~· 
l. Tilt  the machine. 
2. Remove  the bobbin  case 0. 
3. Remove  the screw f). and then  remove  the rotary hook position  bracket. 
4.  Loosen  the three  set screws 
G and remove  the rotary hook 0. 
[I] Thread trimmer 
I. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
II. 
12. 
13 . 
0 
f) 
Remove  the screw 0. and then  remove  the fixed  knife f). 
Push the thread trimmer connecting  rod 0 in the  direction  indicated  by the arrow, and then...

[I] Feed mechanism (8706/8707) 
I. Remove  the wick 0. 
2. Loosen  the two  set screws 0 on the  right  side of the feed  lifting  rock shaft 8, and then  remove  the collar 8. 
3. Loosen  the two  set screws 8 on the  feed  lifting  rock shaft arm 8 and the three  set screws 0 on the  feed  lifting 
arm 8. 
4. Tap wedges into the notches oft he feed  lifting  rock shaft arm 8 and the feed  lifting arm 8, and then  remove  the 
feed  lifting  rock shaft 
8 toward the left side. (The oil rejector 8 and...

[II Feed mechanism (8714/8716/8747) 
I. Loosen  the nut 0. and remove  the screw 8. 
2. Remove  the two  set screws 8. and remove  the oil stopper G. 
3. Loosen  the set screw 8, rotate  the taper pin 8. and remove  the feed  lifting  rock shaft 8 and feed lifting arm 0. 
4. Loosen  the set screw 8. and remove  the feed arm pin GD. 
5. Remove  the two  set screws G), and remove  the oil stopper 48. 
6. Loosen  the set screw 8. disconnect  the taper pin fD, and remove the feed  rock  shaft fl, feed rock...

~ ASSEMBLY ) 
[I] Needle bar 
•• 
Reference 
J~t 
lines ~~ /·-= 
Line 
Screw flat 
B706 
DA x 1 DB X 1 B707 DA X 1 DB X 1 
B714  DA X 1 DB X 1 
B716  DA X 1 DB X 1 
B747 DB X 1 
----
I. Install  the thread  take-up arm assembly 0. the needle bar crank f), the needle bar connecting  rod 0. and the ~ 
washer 8 with the set screw 8. -___/ 
* Refer  to the  above  illustration  for the  position of the  needle bar crank f) screw  flat. 
2. 
Thread the  wick  through  the thread take-up lever support shaft 8....

II] Feed mechanism (8706/8707) 
• 
~ I 
I 
I 
I• 
Feed  dog 
I. Install  the needle  plate 0 with the screws 8. 
2. Tilt  the machine. 
• 
• 
• 
3. Mount the  feed  lifting  rock shaft 8 (from the left  side),  the feed  lifting arm 8. the oil rejector 8. and the  feed 
lifting  rock shaft 
arm 8. 
4. Mount the set collar 0 onto the  feed  lifting  rock shaft 8. and then secure  it with  the screw 8 so that it moves 
easily  with no play. 
5. 
Connect the  wick 8 to feed  lifting  rock shaft 8. (Refer to...

II] Feed mechanism (8714/8716/8747) 
~ 1 I I I• 
• 
Feed dog 
I. Install  the needle  plate 0 with the screws 8. 
2. Tilt  the mac}line. 
3. Mount the taper pin 8 onto the arm bed. 
4. 
Mount the  feed dog 8 onto the feed bar 8 with  the screws 8. 
1/ 1/ 
• 
• 
G 
5. Secure  the feed  rock  shaft 8. the feed  rock  shaft arm O. and the feed bar 8. with  the set screw f) so that they 
move  easily  with no play 
on the taper pin 8. (At this  time,  adjust  the feed dog 8 so that it divides  the groove  in...

fl] Thread trimmer 
I. Fit the  forked  shaft 0 into the arm bed. 
2. Mount the collar 8. the cam lever  return  spring 8. the trimmer cam lever assembly G. the washer8 and the 
cushion 8 onto the arm bed, and then mount the trimmer cam lever  shaft 8 (after fitting the slide block 8 of 
the trimmer cam lever  assembly 8 into the fork of the forked shaft 0). 
3. Fit  the stop ring 0 onto the trimmer cam lever shaft 8. 
4. Tighten the  set screw ~. 
5. Mount the thread trimmer solenoid 4D to the arm bed...

~ Thread trimmer  timing adjustment 
I. Thread trimmer cam position adjustment 
* Turn the pulley, and then  when  the needle bar rises  5 mm 
above the  lowermost  position, press the thread trimmer 
solenoid CD and adjust  the thread trimmer cam G) so that 
the  roller  shaft contacts  the cut out part of the thread 
trimmer cam G) and the end of the cam and the end of the 
roller  shaft 
is 0.6 to 0.8 mm when the thread trimmer cam 
lever  assembly  returns. 
2. Fixed knife and moving  knife position...