Sharp UX-2200CM 사용자 설명서
UX-2200CMU/CMC
FO-2150CMU/CMC
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6
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12. Home Position Sensor
LEFT
RIGHT
CARRIAGE HOLDER
A
B
C
The home position of carriage is detected as a result of change of output of photointurrupter A which is caused due to
shutting-off of optical path of photointerrupter A by the slit B .
While the photointerrupter is shut off by the slit B, the output (pin 1 of CN3) of photointerrupter gets H level (+5V). If it
is not shut off, the output gets L level (0V).
In the home position the output is L. In case of L direction movement the output is H during passing through the slit,
and after passing the output gets again L level.
The operation logic is as follows.
Insignificant movement in L direction
(1) If in this case the output is L:
It is judged that the carriage exists in the L direction as compared to the slit B . The carriage is moved in the R direc-
tion, so that the output changes from L to H (during passing through the slit B ). Further the carriage is moved in the R
direction. The position where H changes to L again is regarded as a home position.
shutting-off of optical path of photointerrupter A by the slit B .
While the photointerrupter is shut off by the slit B, the output (pin 1 of CN3) of photointerrupter gets H level (+5V). If it
is not shut off, the output gets L level (0V).
In the home position the output is L. In case of L direction movement the output is H during passing through the slit,
and after passing the output gets again L level.
The operation logic is as follows.
Insignificant movement in L direction
(1) If in this case the output is L:
It is judged that the carriage exists in the L direction as compared to the slit B . The carriage is moved in the R direc-
tion, so that the output changes from L to H (during passing through the slit B ). Further the carriage is moved in the R
direction. The position where H changes to L again is regarded as a home position.
(2) If in this case the output is H:
It is judged that the carriage exists near the home position, the carriage is moved in the R direction. The position
where the output is changed from H to L is regarded as a home position.
It is judged that the carriage exists near the home position, the carriage is moved in the R direction. The position
where the output is changed from H to L is regarded as a home position.
Operation in case of malfunction of photointerrupter A .
Case 1: When the output of photointerrupter remains H.
Case 1: When the output of photointerrupter remains H.
As is evident from the operation logic, the H output does not continue for a long time in case of normal operation.
Hence, this state is judged to be abnormal. The carriage stops soon after it moves insignificantly.
Hence, this state is judged to be abnormal. The carriage stops soon after it moves insignificantly.
Case 2: When the output of photointerrupter remains L.
The carriage is going to move according to the operation logic. Since the output remains L even when the sensor
passes through the slit B , the home position cannot be found, and the carriage moves continuously in the R direction.
Finally, it contacts the frame C , emitting an abnormal sound. The abnormal state is detected, and the motor stops.
The carriage is going to move according to the operation logic. Since the output remains L even when the sensor
passes through the slit B , the home position cannot be found, and the carriage moves continuously in the R direction.
Finally, it contacts the frame C , emitting an abnormal sound. The abnormal state is detected, and the motor stops.