Theory Of Operation; Control Knob - ProSeal 25 Service Manual

Section 3.

Theory of Operation

3-1.

Control Knob

The Control Knob (see figure 4) is located on the right hand side of the laminator and is operated from
the front of the machine. The Control Knob has four (4) purposes:
1. Turn the power on.
2. Turn the heat on.
3. Turn the rollers on.
4. Adjust the height of the rollers.
The Control Knob can be operated by pushing it in
approximately 1/4" (6mm) to the left. Once the
knob has disengaged from the stop, it may be
rotated forward or backward (clockwise or counter-
clockwise, viewed from the right hand side of the
unit).
To switch the power on, push the knob in and
rotate it slowly towards you (counter clockwise as
viewed from the right side of the unit). The top LED
will light up to indicate that the power is on.
Continue to rotate the knob until the desired measurement corresponds with the indicator window at
the base of the knob. Inside the window, the rotation possibilities are shown. Select the measurement
that indicates the thickness of the material you will be using with the machine. Releasing the knob so
that it moves back to the right and clicks into place will set the rollers for use. The measurements on
the knob, ¼", 3/16", 1/8" and 1/16" (6, 5, 3, 1.5 mm) correspond to 'Pouch board thickness'. There is
also a fully closed stop for future film only applications.
To turn the laminator off, grasp the control knob and push to the left, rotate the knob away from you
as far as it will go (clockwise). This will shut off the machine and open the rollers to permit objects to
be removed.
Internal functionality
See figure 5.
Inside the machine, a rod is mounted
between the left- and righthand framesheets.
The knob is mounted on the rod; it allows
axial movement, but no radial movement. The
knob is provided with a pin (1), that falls in the
indents (2) of a bracket (3). The same rod is
provided with an eccentric (4) on either side
of the machine. These eccentrics push or pull
the arms (5), where the top roller is mounted
in, upward or downward. The mains switch is
mounted in such a way, that it switches the
power off once the are is in its highest
position.
Theory of Operation
fig. 4
5
4
fig. 5
3-1
1
2
3
February 2000