18
Fixing the rack
The rack, appropriately fixed to the leaf, transforms the rotary
movement of the gear into the linear movement of the leaf.
Before fixing the rack, it is necessary to release the gear motor,
proceed as follows:
1) Turn the circular cover by 180°, in a way to view the trian-
gular pin.
2 - Insert the release key FRD.3 and turn it clockwise until a
certain resistance is felt (Fig.13).
About 15 complete rotations of the key are necessary
3 - The gear is now released and free to turn.
Now fix the rack:
1 - Take the leaf into the completely open position.
2 - Place the first tract of the rack on the gear.
Considering the measurements indicated in figures 3a and 3b,
mark the first drilling point. Block the rack temporarily, using a
clamp for example (Fig.15).
3 - Drill and block the first fin of the rack using the screw and
the washer as indicated in figure 16, checking that a space of
about 1 mm remains between the gear and rack (Fig.17).
4 - Make the leaf slide and take the driving gear near to the
second fixing fin, always checking the space of 1mm between
gear and rack (Fig.18).
5 - Proceed in the same way for the other fins, moving the
leaf every time in a way always to have the correct gear/rack
coupling.
6 - Now continue with the remaining tracts of the rack. Every
tract must be attached to the previous one as indicated in Figure
19, in a way to keep the rack pitch constant.
Use several manual opening and closing manoeuvres
to check that the rack is correctly engaged, along its
entire length. If necessary, the holes present on the rack
allow height adjustment.
Fig. 13
Fig. 14
Fig. 15
Fig. 16
Fig. 17
Fig. 18
Fig. 19
1 mm
