Cassette Mechanism - Planmeca Proline CC Technical Manual

Chapter I - FUNCTIONAL DESCRIPTION
1.2

Cassette mechanism

I-4 Planmeca Proline CC panoramic x-ray
The primary function of the cassette mechanism is to enable controlled linear movement of the
film cassette across the radiation beam synchronically in relation to the rotation movement.
Besides, the cassette mechanism has certain secondary functions such as secondary slot which
prevents the radiation scattering from patient from exposing the film and Frankfort positioning
light reflector which produces a horizontal light beam to facilitate patient positioning.
The assembly (Fig. 3, 1) is the frame of the cassette mechanism. A carriage (Fig. 3, 2) is
attached with bearings and axles (Fig. 3, 3 and 4) to the frame. The panoramic carriage is locked
to the frame.
The cassette holder (Fig. 3, 5) is attached with linear bearings to the carriage through axle (Fig.
3, 6) and support wheel (Fig. 3, 7). The cassette carriage is driven by an friction wheel (Fig. 3, 8)
which is in contact with the top surface of the carriage.
The lateral force caused by the cassette holder, the weight of the film cassette and the loading
spring of the driving wheel is compensated by a support wheel in the carriage (Fig. 3, 2). The
cassette holder rolls against the support wheel. The secondary slot (Fig. 3, 9) is attached to the
carriage (Fig. 3, 2). Commanded by the microprocessor a stepper motor (Fig. 3, 10) rotates the
friction wheel analogically with the rotation mechanism through worm gear transmission.
The cassette mechanism is shown below
2
9
4
Figure 3
6
5
8
10
7
3
1
Technical Manual