Providing a Force on Top of the Media
Bail
The bail provides a normal force on top of the media. (Illustration ' page 10/25.) When the pinch/wheels grip the media and the drive roller advances it, the plotter raises the bail. This enables the leading edge of the media to pass below the bail. The plotter then lowers the bail and advances the media to the overdrive roller. The star wheels on the bail are coated with a substance resistant to wet ink, so that they do not leave marks on the media.
BailLift Mechanism
The bail features an automatic lift mechanism driven by the media motor using a series of gears and actuated by the cartridge carriage.
Operation
(Part illustrations ' page 10/25)
1The cartridge carriage presses down on the engaging lever.
2The engaging/lever gear and cam gear (which are always in contact) engage the drive/roller gear on the left end of the drive roller.
3The media/drive system drives the drive roller, and also the cam and engaging/lever gears. The auto/cam, which is attached to the cam gear, turns with the gear.
4The auto/cam contacts the left bail bracket and pushes up on the bracket. As the bracket is pushed, the bail lifts.
5The bail/sensor switch opens and the resulting bail logic level is sent to the main PCA.
6The media/drive rotates the auto/cam to a detent position. The detent position allows the bail bracket to rest on the auto/cam after the carriage moves away from the engaging lever.
7The media/drive drives the media through the media path.
8Once the media has passed the bail, the carriage again engages the bail/lift mechanism to lower the bail.
Bail Sensor
The bail sensor informs the processor of the bail position (Up or Down). It is a mechanical microswitch located on the right side/plate. (Illustration ' page 10/25)
5/8 FunctionalOverview | C3187/90000 |