Setting Of The Needle Bar And Of The Hook Shaft Position; Time Setting Of The Control Cam Of The Thread Cutter - Duerkopp Adler 524 Instructions Manual

22. Setting of the needle bar and of the hook shaft position (Fig. 20, 21)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting operation, wait until the motor stops!
After a larger repair of the machine it is suitable to check up the mutual position of the needle bar in its central position and that of the hook
shaft. The axis of the hook shaft is shifted to the left from the axis of the needle bar. Proceed to the respective setting after having
loosened two screws (3), which secure the clamping joint between the bedplate and the hook gearbox. In its correct position, the hook
gearbox is pushed to the riser of the bed plate and the axis of the hook shaft is parallel with the plane of the bedplate. Secure the box
position in tightening both screws (3).
Notice!
In case of dismounting the hook gearbox it is necessary to respect, when remounting it, the parallelism of the axis of the hook shaft with
the plane of the bed plate. This parallelism is measured e.g. by means of two shafts, which we place on the top surface of the bedplate and
on the machined surface of the gearbox. We check up this parallelism in measuring the value (B).
23. Time setting of the control cam of the thread cutter (Fig. 22)
Caution! Danger of injury!
Switch off the main switch! Before starting the setting
operation, wait until the motor stops!
For a safe and correct thread catching under the throat plate it is neces-
sary to set the correct position of the control cam which is placed on the
bottom shaft. From this cam, the movement of the thread wiper derived
for catching the upper and bottom thread including its cutting, and the
mechanisme of the tensioner. With the machine switched off, tilt the
machine head and, using the hand wheel, set the take-up lever into its
top position. Loosen two screws (1) of the cam (2) and set the loosened
cam in such a way, so that we set the gauge mark on the cam (marked
with colour) into the axis of the pin (3) and secure the cam anew by the
screws (1). This position is to be taken as a basic setting of the cam and
it is necessary to eventually reset it according to the thread or sewn
material type. The start of the thread wiper movement is to be set in
slight turning of the cam on the bottom shaft. Push the lever (4), in this
way the pin (3) is put into the straight course of the groove. In turning
the hand wheel in the direction towards the sewer (in counter-clockwise
direction) check the start of the movement of the thread wiper from the
starting into the rear position.
Check the correct position of the thread wiper as follows:
At the moment when the loop of the upper thread and the bottom thread will leave the knocking-over slide of the hook and form so a
characteristic triangle, the point of the thread wiper should be in its close vicinity. When further turning the hand wheel, the point of the
thread wiper must pass through the triangle (one branch of the upper thread loop, bottom thread on one side of the thread wiper and the
other upper thread loop branch on the other side of the thread wiper). The thread lying on the side of the wiper provided with a cutout,
must fit into this cutout.
After having loosened two screws (1) on the cam (2) set the start of the thread wiper movement. In turning the cam in the direction of the
bottom shaft rotation the start of the thread wiper is accelerated and, inversely, it is delayed. After having set up the cam, check whether
the pin (3), after pushing on the lever (4), fits easily onto the straight part of the cam (2) groove. Push the carrier ring (5) to the cam set
up in this way and tighten it up with the screws (6) on the bottom shaft.
Fig. 20
6
5
8
9 8
1 2 3
3
Fig. 21
7
13
12
11
10
4
Fig. 22