Cassette Handling Sensors - Kodak DirectView CR 800 System Theory Manual

Cassette Handling Sensors

S1 CASSETTE ENTRY SENSOR
S2 CASSETTE LOAD ENTRY SENSOR
S3 CASSETTE REAR SENSOR
S4 LIGHT SHUTTER SENSOR
INTERNAL BARCODE READER
7–30
Ill. S1, S2, S3, S4
These optical sensors (LED/Phototransistor) are located at the cassette entry and load positions of the CASSETTE
HANDLING AY. The emitters of each are located on one side of the entrance with the detectors directly opposite each
respectively.
These 2 sensors are monitored constantly to detect the presence of the CASSETTE in the load station and together
determine that the CASSETTE is aligned correctly for transport into the CR800. When a CASSETTE is inserted into the
Load Station, the light beam of S1 is interrupted first, then as the Cassette is pushed further in, both the S1 and S2 are
interrupted. As the CASSETTE interrupts the sensors a cassette detected message is relayed to Logic. Logic considers a
Cassette to be present if the light beam of either sensor is blocked for more than 5 seconds or if both the S1 and the S2 are
blocked.
The S3 CASSETTE REAR SENSOR is mounted on the INTERMEDIATE PLATE and is located at the Cassette Loading
end of travel. During CASSETTE loading, the DRIVE ROLLERS drive the CASSETTE to the END STOP. The S3 detects
the incoming CASSETTE, shutting down the RIGHT and LEFT CASSETTE DRIVE MOTORS.
The S4 LIGHT SHUTTER SENSOR is responsible for confirming the position of the LIGHT SHUTTER, either "Open" or
"light-lock." The "at rest" position for the LIGHT SHUTTER is open, that is, the actuator is blocking the S4. When the
LIGHT SHUTTER moves into the light-lock position, the S4 is unblocked, and it reports the change of state to the MSC
BD. PLATE extraction cannot proceed until the S4 is unblocked (the LIGHT SHUTTER is in the light -lock position).
The INTERNAL BARCODE READER reads barcode information from the CASSETTE and sends it to the MCPU. The
BARCODE READER is controlled via and RS-232 interface to the MSC BD.
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