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THEORY OF OPERATION
4-5. Detectors
(1) Home Position Detector
A photo-interrupter is used in the home position detector, which is set at the left side of the frame unit.
ON/OFF signals are generated according to the position of the shield plate mounted at the base of the carriage, and
the printing position is determined by these signals.
(2) Paper Out Detector Two paper out detectors are located at the paper insertion slit. When paper is present, the photo
transistor with the reflecting type photo sensor goes on. As soon as paper runs out, this transistor goes off, outputting
a paper empty signal.
Fig. 2-21 Home Position Detector Fig. 2-22 Paper Out Detector
(3) Bail Lever Position Detector
The leaf switch is open when the bail roller is in contact with the platen roller, and it is closed when the bail roller
is separated from the platen roller.
(4) Release Lever Position Detector
The leaf switch is closed when the release lever is in the Friction position, and is open in the Tractor position.
Fig. 2-23 Bail Lever Position Detector Fig. 2-24 Release Lever Position Detector
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