Needle Guard; Thrust Motion For The Feed Dog - Duerkopp Adler 171 Service Manual

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.

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.
S
e
e
8
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.
4
"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.
7
3
1
2
13