5
3.1.10 Dismantling of the hook box
When dismantling the box (1), the supplies of lubricating oil
are to be disconnected first, the fastening screws unscrewed
and, thereafter, the box is removed.
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Unscrew the screw (8) from the oil tank (4) and pull the box
out from the bedplate (7).
- Disconnect the lubricating tubes with the wicks (2) and ( )
from the oil tank (4).
- Loosen only one screw (5).
- Unscrew the screws (6).
- Shift the hook box in the sense of the arrow and remove it
out from the machine.
- When mounting it, proceed inversely.
3.2 eedle and thread mechanism
3.2.1 Description
The take-up lever (1) is mounted in ball bearings, both at the
spot of its suspending on the connecting rod (2) and in the
mounting on the loop (12). The take-up lever is of aluminum
and is provided with a stuck-in eye for two threads.
The connecting rod (2) is mounted on the pin ( ). The needle
rod holder (4) is mounted through the pivot (5) in a rotating
way in the arm (6). In its top part, the holder is guided by the
guide pin (7). The movement for the needle feed is given to it
by the connecting rod (8) driven by the feeding shaft (9). The
connecting rod (8) is mounted by pin (1 ) with needle bar
holder (4).
The connecting rod (10) of the needle bar (11) on the loop
(12) is mounted in a ball bearing and it is slidingly mounted
on the needle bar carrier. The mechanism is lubricated by means
of a central-wick lubricating system.
3.2.2 To check the handwheel angular adjustment
The handwheel (5) must be situated in its precise position
relative to the needle and thread mechanism. This position is
given by a pin (2), which locks the connecting rod of the
needle rod (1) through a hole in the arm ( ). In this position,
the indicator (6) of the handwheel must show O. The position
is fixed by the handwheel screw (4) contacting a small flat
surface provided on the upper shaft.
The correct adjustment of the angular position has been car-
ried out at the producers.
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
3.2.3 Height setting of the needle bar
At the moment, when the hook point passes around the needle,
the upper edge of the needle eye must be about 1 mm below
the hook point. In an opposite case, it is necessary to set the
height of the needle bar as follows:
Caution ! Danger of injury!
Switch off the main switch! Before starting the
setting operation, wait until the motor stops!
- Remove the front guard.
- Loosen the screws (1) of the needle bar carrier
- Set the correct height of the needle bar and tighten anew
the screws (1).
Caution !
An incorrect setting of the needle bar height may
cause the striking of the hook point against the
needle.
5
11
6
9
3
4
7
8
2
1
4
5
6
0o
1
1
6
1
5
5
6
8
4
2
10
12
13
7
3
1
2
3
