Duerkopp Adler 171 User manual

Contents Page
General safety instructions
1. Set of gauges and handwheel positions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Parts of the set of gauges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Adjustments in the different handwheel positions . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Adjusting the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Adjustment disk with respect to the arm shaft crank . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Lower timing belt pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Rocker bolt for the looper drive and left bottom shaft bearing . . . . . . . . . . . . . . . . . 8
2.4 Looper drive housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Looper avoid (width of the elliptic looper path) . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.6 Symmetry of the looper motion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.7 Looper in the looper holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.8 Loop stroke and needle bar height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9 Needle guard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.10 Thrust motion for the feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.11 Stroke motion for the feed dog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.12 Retaining spring at the looper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.13 Looper thread take-up cam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.14 Thread trimming device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2.15 Sewing foot stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2.16 Setting the stitch lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3. Setting the top puller feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.1 Synchronisation of the bottom feed and top puller feed . . . . . . . . . . . . . . . . . . . . 22
3.2 Distance between the puller and needle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.3 Raising stroke of the puller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.4 Puller pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.5 Fabric keep-off plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.6 Timing belt tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.7 Replacing the puller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.8 Raising and lowering functions of the puller . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4. Adjusting the synchronizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

1. Set of gauges and handwheel positions
1.1 Parts of the set of gauges
The gauges listed below enable the accurate adjusting and checking of the classes 171 and 173.
The timing pin 3 is incorporated in the accessories of every delivered machine. It can be used to lock the
handwheel positions A - F that are required for the machine adjustments.
Gauges Order no. Adjustment
Gauge 1 933 735 – Position of the rocker bolt in the looper drive housing
Gauge 2 933 739K – Position of the looper drive housing
Timing pin 3
(accessories bag) 791 1152 – Locking the handwheel positions A - F
Metering clock 4 171 981 – To measure the looper avoid ( width of the elliptic
looper path).
Should you already have a metering clock, you will
just need the clamping sleeve 171 984 and the
measuring pin 933 748.
Gauge 5 171 975 – Looper inclined by 89°30’
Gauge 6 933 80192 – Symmetrical looper motion
Gauge 8 933 740 – Height of the looper thread take-up cam
Gauge 9
(accessories bag) 933 758 – Thrust eccentric for the feed dog
Screw 10 933 716 – Spreading screw for replacing the arm shaft crank, eg
when modifying the needle bar stroke
3
6
10
1
4
2
5
8
9
5

1.2 Adjustments in the different handwheel positions
For some adjustments the machine must be set in a certain position.
This position is marked by letters on the handwheel and can be locked as follows:
– Turn the handwheel into the position defined for the adjustment.
– Slide the timing pin 4 into the hole of the machine housing.
– Turn the handwheel slightly forward and backward until the timing pin 4 can be slid into the respective
slot of the adjustment disk 1.
– Slot A of the adjustment disk is cut out the deepest.
The depths of the slots B - F are equal.
Slot Adjustment
A– The deepest slot A of the adjustment disk at the upper timing belt
pulley is aligned with the groove in the arm shaft crank
B – Symmetrical looper motion that is, when turning the handwheel in
reverse direction, the needle point must also be located at the centre
of the needle like in slot C
C – Position of the lower timing belt pulley
– Loop stroke
– Needle bar height
D – Stroke and thrust eccentric of the feed dog on right-hand machines
E – Looper thread take-up cam
– Eccentric for the top puller feed
F – Stroke and thrust eccentric of the feed dog on left-hand machines
Please note!
Depending on the needle bar stroke, the following adjustment disks are built-in:
Class / Subclass Needle bar stroke Adjustment disk
171-131110 27 mm 171 1012
173-141110 30 mm 171 1512
173-141521 30 mm 171 1512
173-161120 32 mm 171 2012
Operating direction
4
1
A F E D
BC
6

2. Adjusting the machine
2.1 Adjustment disk with respect to the
arm shaft crank
The deepest slot A of the adjustment disk 1 should
be aligned with the groove 2 in the arm shaft crank.
(The adjustment disk must be in this position to
assure that all other adjustments to be made in the
other slots are correct.)
Turn off main switch!
- Danger of injury -
Initially, check the factory adjustment using two
locking pins (as an alternative 5-mm-twist drills).
– Loosen the clamping screws of the clamping
ring. (The clamping ring is located on the left of
the upper timing belt pulley).
– Slide the pin 3 into the groove 2 of the arm
shaft crank.
– Turn the handwheel until the timing pin 4 can
be slid into the deepest slot Aof the adjustment
disk.
– Push the arm shaft crank to the right so it is
dead against the arm shaft bearing.
Tighten the screws of the clamping ring.
2.2 Lower timing belt pulley
Turn off main switch!
- Danger of injury -
When positioning the timing belt, make sure that
both screws in slot C are positioned as shown in
the drawing and are thus accessible with a
screwdriver.
2 3
4
7

2.3 Rocker bolt for the looper drive and left bottom shaft bearing
Turn off main switch!
- Danger of injury -
The distance between the centre of the needle and
the beginning of the left bottom shaft bearing 6
should be 39.8 mm and between the centre of the
needle and the end of the rocker bolt 38.8 mm.
The rocker bolt 2 must be flush with the face 3 of
the bottom shaft.
– Unscrew the screw 9 and drain the oil in the
housing. Set the machine into the upright
position.
– Remove the needle, needle guard, looper
holder 8 with the looper and the thread
trimming device 7.
– Loosen the clamping screw 11.
– Carefully remove the looper drive housing 10.
At the same time slowly turn the bottom shaft 3.
– Screw on the gauge 1, order no. 933 735.
Loosen the clamping screws 5.
– Push the bottom shaft bearing 6 beside the
gauge. Tighten the clamping screws 5.
– Loosen the screws 4.
Check, whether the rocker bolt 2 is dead
against the face 3 of the bottom shaft.
– Remove the grease cover and the oil drip pan
15.
– Loosen the eccentric 13, adjusting ring 14 and
the gearwheel 12.
Shift the bottom shaft 3 such that the distance
between the bottom shaft bearing 6 and the
rocker bolt 2 is 1 mm or the rocker bolt rests
against the gauge.
– Set the adjusting ring 14 and the eccentric 13
tight and align the gearwheel 12. Tighten the
screws.
– Check the running of the timing belt on the
bottom timing belt pulley. If necessary, align the
bottom timing belt pulley.
– Screw in the screw 9.
Re-mount the looper drive housing and fill with
ESSO SP-NK 10 oil to the upper mark of the
sight glass.
– To adjust the housing, looper, needle guard and
the thread trimmer, see sections 2.4, 2.5, 2.6,
2.7 and 2.14.
2.4 Looper drive housing
1 2 3 4
6
5
13 14 15 3
12
7 8 9 10 11
8

2.4 Looper drive housing
Turn off main switch!
- Danger of injury -
The needle point should point to the centre of the
looper shaft 5 and the bottom edge of the looper
shaft should be parallel to the throat plate
underside.
This corresponds to a distance of 50.5 mm
between the looper shaft bottom edge 4 and the
throat plate rest 2.
Remove the throat plate and looper holder with the
looper. Loosen the clamping screw 3.
Align the looper drive housing such that the looper
shaft rests in the cutout of the gauge 1.
Tighten the clamping screw 3.
2.5 Looper avoid (width of the elliptic looper path)
Turn off main switch!
- Danger of injury -
The looper avoid motion is adjusted correctly, when
the clearance between the looper point and needle
is 0.1 mm during the right-to-left looper motion.
During the left-to-right looper motion the point of
the descending needle must rest against the back
of the looper, when the looper and needle are
positioned as shown in the sketch opposite.
The exact amount of the avoid motion depends on
the needle system and needle size. It must thus be
computed according to the following formula:
E = a + b +0.1 + X
Example for a 934 SIN/Nm 110 needle
__________________________________________
Needle size "a" = 0.7 mm
Looper thickness "b" = 1.4 mm
Looper point - needle clearance = 0.1 mm
For greater needle size 110 Nm "X" * = 0.1 mm
Width of the elliptic looper path "E" = 2.3 mm
*X=greater measure "a" for greater needle sizes.
X for Nm 100 = 0 mm
X for Nm 110 and 120 = 0.1 mm
X for Nm 130 = 0.2 mm
To adjust, shift the bottom shaft axially.
To the right: decreasing the width of the elliptic path
To the left: increasing the width of the elliptic path
For the adjustment see next page.
1
2
3
5 4
a
x
b
9

To adjust the width of the elliptic looper path proceed as follows:
– Insert a straight and undamaged needle.
Screw in the clamping bushing 2 and insert the
metering clock 1.
– Turn the handwheel to set the looper shaft 7 at
its lowest point. Set the metering clock at the
measuring value 0.
– Then turn the handwheel to set the looper shaft
at its highest point.
Read the difference on the metering clock.
Should the measure not be identical with the
computed width of the elliptic path, the bottom
shaft 11 must be loosened.
– In the case of an adjustment in axial direction
the width of the elliptic path changes with a
ratio of 1:2. When thus the bottom shaft is
shifted eg 0.2 mm, the width of the elliptic path
changes by 0.1 mm.
– Remove the throat plate and feed dog. Set the
needle guard 3 to the rear.
– Loosen the eccentric 9, adjusting ring 10 and
the gearwheel 8.
Push the bottom shaft 11 into the respective
direction until the computed measure is
reached.
– Tighten the eccentric 9 and the adjusting ring
10 so that the bottom shaft 11 is set tight. Align
the gearwheel 8 and tighten.
– Loosen the screw 5 and one of the screws 4.
Set a distance of 0.1 mm between the looper
point and the needle by shifting the looper
holder 6 (looper point behind the needle).
Re-tighten the screws 4 and 5.
– Check the running of the timing belt. If
necessary, align the lower timing belt pulley.
3 4 5 6 7
1 2
8 9 10 11
10

2.6 Symmetry of the looper motion
Turn off main switch!
- Danger of injury -
This adjustment means that the looper point is
located at the centre of the needle, when the
machine is locked either in slot C or B.
In slot C the looper point should be behind the
needle, and in slot B in front of the needle.
– To enable an accurate adjustment, fasten the
gauge 1 on the looper drive housing and the
pointer 2 on the looper shaft.
– Loosen the screws of the lower timing belt
pulley.
– Turn the bottom shaft such that in slot C and B
each, the pointer 2 is over the mark of the
gauge.
When turning the handwheel the pointer must
swing to the left.
– Tighten the screws of the timing belt pulley.
2.7 Looper in the looper holder
Turn off main switch!
- Danger of injury -
The looper face should be positioned with respect
to the edge of the machine bed at an angle of 89°
30’.
In the case of two loopers, first align and securely
tighten the rear looper, and then the front one.
The adjustment can be made using the gauge
171 975, as shown in the figure opposite.
1 2
In operating direction - slot C In reverse direction - slot B
11

2.8 Loop stroke and needle bar height
Turn off main switch!
- Danger of injury -
The loop stroke is 3.5 mm. This means that the
looper point must be at the centre of the needle,
when the needle has risen 3.5 mm from its lower
dead point by turning the handwheel in operating
direction. - Slot C of the adjustment disk.
This adjustment must also exist in reverse
direction. - Slot B of the adjustment disk. See also
section 2.6 Symmetry of the looper motion.
When the looper eye is at the centre of the needle,
the bottom edge of the needle eye and the upper
edge of the looper eye should be level.
(see Fig.)
– Insert the needle into the needle bar and fasten.
– Lock the machine in slot C.
– Position hook point behind the needle on
needle center line.
To do this, loosen the screw 3. Turn the set
screws 2 and 4 accordingly.
Tighten the screw 3.
– Loosen the screw 5.
Adjust the needle bar height such that the
lower edge of thread eye is aligned with the
upper edge of the looper’s eye.
Tighten the screw 5.
– Set a distance of 0.1 mm between the looper
point and the centre of the needle by shifting
the looper holder axially.
Tighten the screw 3. (see Fig.)
– Check symmetry of looper motion (Pos. B•
and C). See section 2.6.
1
2
4
3
5
12

2.9 Needle guard
Turn off main switch!
- Danger of injury -
When the looper point
moves to the left and
reaches the needle, the
needle point should rest
against the
needle guard.
When lateral pressure is
applied to the needle, it
must not be possible to
press it into the path of the
looper point.
In the lowest needle po-
sition, half of the needle eye
must remain accessible.
S
e
e
s
k
e
t
c
h
.
– Loosen the screw 7.
Adjust the height of the needle guard ac-
cordingly.
Tighten the screw 7.
– Loosen the screws 8.
Place the needle guard against the needle
point.
Tighten the screws 8.
The needle must not be deflected more than is
required.
2.10 Thrust motion for the feed dog
Turn off main switch!
- Danger of injury -
To assure good stitch tightening the feed dog
should make a slight "additional thrust motion"
after the needle has passed its upper dead position.
The accurate adjustment is obtained in slot D using
the gauge 2 that is in the accessories bag. Proceed
as follows:
– Loosen the screws of the thrust eccentric 3.
– Lock the handwheel in slot D.
– Slide the gauge 2 into the slot 1 of the thrust
eccentric.
– Turn the thrust eccentric 3 such that the edges
of the gauge rest on the stitch regulator frame 4.
– Tighten the screws of the thrust eccentric.
Make sure that the bottom shaft is set tight.
– With maximum feeding length the feed dog
must not strike the edges of the throat plate
slots.
Attention exception!
The class 171-131110 without frame shaft, ie with
fixedly adjustable stitch lengths, is an exception as
to adjustments.
The 171-131110 can be retrofitted for the use on
hemming units.
Kit 171 1201 for "right-hand machines"
Kit 171 1301 for "left-hand machines"
Please note that the thrust eccentric must be
adjusted differently on left- and right-hand
machines.
"Left-hand machine": slot F
Set the first screw seen in operating direction of
the thrust eccentric 3 with its lower edge onto the
upper edge of the gauge.
"Right-hand machine": slot D
Set the second screw seen in operating direction of
the thrust eccentric 3 with its lower edge onto the
upper edge of the gauge. See sketch.
8
7
4
3
1
2
13