Rotary Microtome HM 355 S
MICROM International GmbH
Robert-Bosch-Str. 49
D- 69190 Walldorf
2-16-2 AUTOMATIC APPROACH
SYSTEM
The automatic approach system is used for the fast
and exact approach of the specimen (fig. 24.2)
towards the knife edge (fig. 24.1). Fig. 24 shows
the position of the sensor (fig. 24.3) at the
beginning of the automatic approach process.
Install the automatic approach system by means of
the two visible screws on the rear side of the knife
carrier base (alternatively same installation position
as the backlighting system) and connect it to the
socket on the right front side of the instrument.
Clamp the specimen, adjust the knife carrier and
check all clamping levers.
Fig. 24
Now, turn the handle of the handwheel to the lower
position, i.e. the specimen holder together with the
specimen is also in the lower position.
Press button A (fig. 5.9) on the operating panel to
start the automatic approach process. The red
LED in button (fig. 5.9) lights up continuously. If
the LED in button (fig. 5.9) flashes only, this means
that the automatic approach was selected, but not
yet started. In this case, turn the handwheel further
to the lower position until the LED in button (fig.
5.9) lights continuously.
Now the specimen holder together with the
specimen moves forwards until a certain point is
reached. The automatic approach system then
turns off.
After this process, turn the handwheel and thus the
specimen holder into the upper position. Then the
automatic coarse feed moves the specimen holder
forwards again to carry out a certain correction
value.
The distance between specimen and knife edge is
now very small. When the automatic approach is
finished, the instrument switches automatically over
to the <permanent function> trimming. This way,
trimming can be continued immediately.
The user can determine the above-mentioned
correction value at any time again.
This might be necessary when the automatic
approach system was removed, knife carriers have
been exchanged or if the knife was adjusted in a
different way.
To determine the correction value again, turn the
handwheel handle into the lower position. Press
button A (fig. 5.9). The specimen holder with
specimen is now moved forwards to a switching
point by means of the coarse feed. After having
reached the switching point, the coarse feed turns
off automatically. Then turn the handwheel to bring
the specimen holder together with the specimen
into the middle position.
If required use the functions <coarse feed
forwards> (fig. 5.16), <trimming> (fig. 5.14) as
well as <coarse feed backwards> (fig. 5.15) to
carry out a specific approach up to the desired
distance between specimen and knife edge.
Then turn the handwheel handle into the upper
position. In this case, further forward movements
of the specimen holder are not carried out. The
sum of the forward and backward movements,
which were carried out by means of the above-
mentioned functions, is now stored as a new
correction value. This value is now valid for all
future automatic approaches until a new correction
value is stored again.
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