192
9.4 U
NWIND
UNIT
ALS
20X
256
9.4.2
Brake
Tools:
– Hexagon socket driver SW 2.5, 3
– Size 2 Phillips screwdriver
– 2 Feeler gauges, thickness 0.7 mm
– Circlip pliers internal for diameter 15
– Circlip pliers external for diameter 10
– Retaining ring pliers
Adjusting the brake
Remove core adapters
Remove the three screws [221A], remove the sup-
port disc [221B].
Check play on both sides of the brake cam [222B]
using two feeler gauges [222A], with the brake off
(dancer arm in rest position).
– Correct play at brake cam: 0.7 mm
To adjust play:
Observe the information next to Fig. [223] uncondi-
tionally.
Loosen retaining screws [222D] on the rotary axles
of both brake shoes [222C] by one quarter turn.
Adjust play and tighten retaining screws.
Check play with two feeler gauges.
If play is correctly adjusted, swivel dancer arm antic-
lockwise about 20°.
– The brake shoes must open and allow free rotation
of the expanding mandrel [222E].
Install support disc and core adapters.
The retaining screws [222D] on the rotary axles
of the brake shoes are screwed into square
nuts [223B]. The square nuts are located in a
recess in the steel brake flange and brace
against its side [223arrow]. There is therefore
no need to hold the other end of the retaining
screws while loosening and tightening. The
screws are secured with locknuts [223A]. The
locknuts prevent the retaining screws from be-
ing unscrewed too far. If this happened, the
square bolts would no longer brace against the
recess edge and tightening would be impossi-
ble without holding the other end. To do this,
the entire brake unit would have to be removed.
[221] Removing the support disc (fig.: ALS 20X)
[222] Adjusting play at the brake cam
[223] Securing the retaining screws; rear view of brake when re-
moved from casing
A
B
A
B
D
C
E
B
C
A
Summary of Contents for ALS 204
Page 1: ...ALS 204 206 256 SERVICE INSTALLATION MANUAL Labeller Edition 8 3 2012 Original version ...
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