Universal Laser Systems CLP-100NI-NPRT - Manual (Page 20)

20
WEB PRINTING
3 -Press down lightly on the spring tension arm
to compress the tension spring slightly. (Fig-
ure 35) While holding a light pressure on the
arm, tighten the mounting bracket clamping
screw.
This procedure is used to adjust the contact pres-
sure which the print drum exerts against the web.
Only enough pressure should be applied to ensure
positive friction drive of the print drum. Excessive
contact pressure will impose unnecessary drag on
the web and may result in poor print quality.
In high speed web applications, the distance the web travels at a given speed in 2-3 seconds can be substantial.
It is important to note that when the printed web is tightly rewound, the additional pressure applied to the printed
marks can increase the possibility of a ghost image transfer of the ink to the back of the web.
If this situation occurs and the web speed cannot be slowed down to allow more drying time, air blowers can be
used to direct heated air on the printed marks to accelerate drying. Preheating the web material slightly with hot
air before printing can also be an effective method to decrease the drying time. If either of these techniques are
used, it is recommended that the hot air blowers be electrically tied into the web feed motor energizing circuit.
This will ensure that the blowers are turned off automatically if the web is stopped.
MOUNTING THE CODER
1 - After determining the best location
to mount the coder, install the sup-
plied mounting bracket (Figure 34) on
a rigid surface using two 3/8" diameter
bolts, nuts, washers and lock wash-
ers (not supplied). Be sure that the
mounting column of the coder is par-
allel to the idler roll.
2 - Insert the mounting column into the
mounting bracket and allow the print
drum to pivot into contact with the
idler roll. Do not tighten the bracket
clamping screw at this time.
FIGURE 34
FIGURE 35
3/8” BOLTS
MOUNTING
COLUMN
MOUNTING
BRACKET
PRINT DRUM
IDLER ROLL
MOUNTING BRACKET
CLAMPING SCREW
AL
PRESS DOWNWARD
SPRING TENSION ARM
TENSION SPRING
IDLER ROLL