Planmeca Proline XC Technical Manual page 239

MECHANICAL CONSTRUCTION AND OPERATION
Technical Manual
The rotating unit (Fig. 2, 7) is attached with bearings to the upper horizontal part by means of
a cam (Fig. 2, 1). For both axles of the cam there are two angular contact ball bearings (Fig.
2, 2) which are preloaded without clearance by means of nuts (Fig. 2, 3).
The cam has two main tasks: Firstly, it transfers the weight of the rotating unit to the main
block (Fig. 2, 4) through bearings. Secondly, it determines the path of the bearing point B dur-
ing the rotating cycle. Apart from point B, the path of the rotating movement is also deter-
mined by drive / guide point C. On the main block (Fig. 2, 4) there is a U-groove and a guide
wheel (Fig. 2, 5) rolls along the inner edge of the groove. The bearing point of the wheel is
fixed in relation to the rotating unit (Fig. 2, 7). There is also a driving wheel (Fig. 2, 6) which is
concentrically located in relation to the bearing point. The fixing point of the driving wheel
(transmission) is located so that the driving wheel can move unhindered crosswise in relation
to the groove.
The mechanism has a loading spring (Fig. 2, 8) which forces the driving wheel against the
outer edge with great pressure.
Figure 2
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3
Chapter I - FUNCTIONAL DESCRIPTION
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Planmeca Proline XC X-ray unit I-3