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June 2005 © TOSHIBA TEC MR-3018 DESCRIPTION OF OPERATIONS
3 - 5
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3.2 Original Size Detection
The original tray width sensor, original length detection sensor, and original width detection sensors-1
and -2 work in combination to detect the size of originals.
Fig.3-5
3.2.1 Outline
When an original is placed on the original tray, the width of the original is detected by the positions of
the original width guides. Then the original width sensors -1 and -2 and the original length detection
sensor detect the size of the original being transported. Based on the detection result of these sensors,
the size of the original is finally determined.
3.2.2 Original tray width sensor
The original tray width sensor detects the width of the original placed on the original tray.
This sensor consists of a leaf spring and 4 contacting points (= 4 harnesses). When the original width
guides are moved, a protruded part located under the guides pushes the leaf spring, and the leaf spring
thus contacts the harnesses. The gap between these guides is detected by this contact.
A terminal connected with the black harness is for grounding (= common). When the leaf spring con-
tacts with each harness of gray, yellow and orange, each terminal connected with these harnesses gen-
erates a signal at a low level.
The combination of these contact (= low level) and release (= high level) can determine the width of the
original.
Sizes detectable in combination of these contact and release are as follows:
H (= high level): Release L (= low level): Contact
TWIDTH2
(Orange)
TWIDTH1
(Yellow)
TWIDTH0
(Gray)
Original width size
HHH LD / LT
HHL -
HLH ST-R
LHH LD / LT
LHL -
L L H 8.5x8.5 / LT-R / KLG / 13”LG
LLL COMPUTER
Original width detection sensor-1
Original width detection sensor-2
Original length
detection sensor
Original tray width sensor