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5Ć9
Functional Overview
C3187Ć90000
Stretching the Media
The overdrive roller stretches the media slightly as it is moved through the plotter. It thus
reduces bubbling and media cockle caused by media expansion due to the absorption of
waterĆbased ink into the media. Even though the geometry chosen for the plotters minimizes
the occurrence ofthis phenomena, it still could occur on very dense plots.
(Part illustrations
page 10Ć25)
The overdrive roller is geared to the mediaĆdrive system and has a surface speed 10% greater
than that ofthe drive roller. The lower star wheels on the bail provide a normal force
between the media and the overdrive roller. The resulting friction force creates media
tension in the area between the upper pinchĆwheels and the overdrive roller (the print zone).
The overdrive roller is segmented into small rollers made ofpolyurethane. A clutch
(overdrive gear assembly) is geared to the speedĆratio gear (overdrive gear cluster) and drives
the overdrive roller in the forward direction only.
Moving the Carriage
The Carriage (YĆaxis) drive consists ofa DC motor driving the carriage by means ofa dual,
kevlar belt system incorporating three pulleys and two tensioner assemblies.
(Part illustrations
pages 10Ć19 and 10Ć21)
A gear pinion, pressed onto the carriageĆmotor shaft, drives a small belt tensioned with a
selfĆcompensating, springĆloaded idler.
The small belt drives a double pulley which transfers the motor drive to the main belt.
The main belt is attached to the carriage via frictionĆfit belt clamps. It is tensioned using
a selfĆcompensating, springĆloaded tensioner wedge and main idler. (Illustration
page
10Ć15.) The belt moves the carriage along slider rods, which are part ofthe chassis
assembly. The carriage bearing system consists ofthree bushings.
Positional feedback is obtained using a 150ĆlineĆperĆinch linear encoder strip that is
spring loaded and passes through the carriage where the small slots are read by an
optical encoder. The feedback is used by the carriageĆmotor servoĆcontrol system.
Summary of Contents for DesignJet 200
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Page 22: ...2Ć4 Site Planning and Requirements C3187Ć90000 ...
Page 23: ... ...
Page 27: ... 4 1 2 3 4 5 6 mm 0 25 in 5 1 2 3 4 5 B A B A A B A B X X X ...
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Page 139: ... ...
Page 149: ...8Ć0 8 Troubleshooting ...
Page 178: ...8Ć30 Removal and Replacement C3187Ć90000 ...
Page 179: ...9Ć0 9 Product History and Service Notes ...
Page 193: ...10Ć1 10 Parts and Diagrams ...
Page 197: ...10Ć5 Parts and Diagrams C3187Ć90000 Legs and Media Bin 1 2 3 3 4 5 6 7 1 3 4 3 3 3 3 3 8 8 ...
Page 199: ...10Ć7 Parts and Diagrams C3187Ć90000 Window Center and Bottom Covers To Carriage ...
Page 203: ...10Ć11 Parts and Diagrams C3187Ć90000 Left Endcover and Trim ...
Page 205: ...10Ć13 Parts and Diagrams C3187Ć90000 Right Endcover and Trim ...
Page 207: ...10Ć15 Parts and Diagrams C3187Ć90000 Carriage Axis Drive Left End ...
Page 209: ...10Ć17 Parts and Diagrams C3187Ć90000 Service Station 1 2 3 3 4 5 7 6 6 ...
Page 215: ...10Ć23 Parts and Diagrams C3187Ć90000 Media Drive Assemblies ...
Page 219: ...10Ć25 Parts and Diagrams C3187Ć90000 Bail and Overdrive Assemblies ...
Page 221: ...10Ć27 Parts and Diagrams C3187Ć90000 Pinch Arm Assembly ...
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Page 244: ...IndexĆ04 C3087Ć90000 ...
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