Release Lever Mechanism - Epson LQ-670 Service Manual

2.1.4.3 Release Lever Mechanism

Release lever mechanism consists of the release lever, tractor transmission gear and the release
detector. The setting of the release lever enables to add or release the pressure to the paper advance
rollers and also to change over the tractor drive(continuous paper mode) which can be done by releasing
or conveying the driving force of the PF motor to the tractor transmission gear and tractor gear, and the
friction drive(cut sheet mode).
The release lever moves the rink release lever through the lever release support, and presses the roller
assembly, PF support to the paper strongly or weakly. In the cut sheet mood, the driving force of PF motor
is conveyed to the paper feed(advance) mechanism.
The roller assembly, PF support press the cut sheet actively, and paper advance is performed.
In the continuous paper mode, the paper advance is performed by conveying the driving force of PF motor
to the tractor gear through the tractor transmission gear. In this mode, the roller assembly, PF support is
just to push the paper lightly.
The release detector detects if the release mechanism is set for cut sheet mood or for continuous paper
mood. According to the detector, the main control recognizes an appropriate mode. The table below
shows specification of the release detector.
Category
Type
Switch Rating
Switch mode
Rev. A
Table 2-9. Specification of the Release Detector
Mechanism type
0.6 1.0mA, 5VDC 5%
Friction mode :Open
Tractor mode :Close
Figure 2-6. Release Mechanism
Specification
LQ-670 Service Manual
2-9