Planmeca Proline CC, Technical Manual

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Chapter I - FUNCTIONAL DESCRIPTION
I-6 Planmeca Proline CC panoramic x-ray
Technical Manual
1.5 Positioning mechanism
The fixed frame of the mechanism is the installation plate (Fig. 5, 1), to which the mobile frame is
attached with linear bearings through axes (Fig. 5, 2). All parts entering into contact with the
patient, i.e. patient handles, chin and/or bite support/s (Fig. 5, 3 and 4) and temple supports (Fig.
5, 5) are fixed to the frame (Fig. 5, 6) so that they move together with the frame.
Linear movement is driven by a stepper motor. Primary drive is realized by cogged belt and sec-
ondary drive by a screw. The screw is connected to a drawing nut (Fig. 5, 7) attached to the
frame (Fig. 5, 6). The adjustment of the linear movement position reference is realized with a
Hall-detector. The detector is located on a PCB card (Fig. 5, 8) and the magnet is located on a
bar attached to the installation plate (Fig. 5, 1). The microprocessor controls the linear move-
ment.
The cranks (Fig. 5, 8) of the temple supports are attached with bearings to the frame (Fig. 5, 6)
so that they can rotate freely. The movement of the cranks is synchronized to each other with
gearwheel quadrants. Clearance of the quadrants is adjusted with an adjustment piece (Fig. 5,
9). The force closing the temple supports is produced with a spring. The force is transferred to
the quadrant through lugs (Fig. 5, 10). The force opening the temple supports is produced with
the step motor to a lever (Fig. 5, 11) through a drive screw (Fig. 5, 12) and a drive nut. The lever
transfers the force over to the temple supports through an adjustment screw. The limit switch is
the Hall detector on the PCB card (Fig. 5, 7). The detector gets an impulse from a magnet
located on the lever (Fig. 5, 11). The microprocessor commands the movement of the motor. The
function of the command system is described in section “Circuit boards” on page I-8.
Figure 5
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