4 Maintenance
4--23
F--9999--8 Build 8 Issue 1
4.2.4.1 Vacuum System for Feeding Paper
The machine is equipped with a vacuum pump which provides both vacuum for pick--up and blow air for
separating the sheets. The degree of vacuum can be adjusted by adjusting the nut on the vacuum relief
valve located on the vacuum gage.
The degree to which the vacuum is adjusted depends on the weight and porosity of the paper being fed.
Generally speaking, the lighter and thinner the paper, the lower the vacuum required. The normal range of
vacuum required will vary from about 5 to 10 inches (.18 to .34 BAR) of mercury as shown on the gage. The
best practice is to run as low as possible with continuous feeding and with as least vacuum as possible.
4.2.4.2 Blow--Air System
The blow--air system performs several functions. First, it separates the sheets so the effect of the v acuum
bleeding through the paper is less critical. Also, with the second sheet separated from the first sheet, it
allows air to get in between the sheets when the top sheet is removed from the stack. This prevents the first
sheet from sucking up the second sheet. Another function of the blow--air is to lift the top few sheets until the
top sheet is up against the sheet separator finger. This establishes a uniform height for the top sheet so that
it will be in the proper position when the nozzles come down for the pick--up.
The feeder is equipped with four blow nozzles. Two of these blow in from the edges of the stack and two
blow in from the front of the stack.
Blow air nozzle height is pre--set at the factory and should not need to be adjusted. If they need adjusting,
the side nozzles are adjusted in height by screwing them either up or down. The front nozzles can be
adjusted in height by first tilting them toward the stack and then screwing them either up or down. The
amount of blow--air from the nozzles can be adjusted by use of the exhaust valve located on the left feeder
guard. Individual nozzles can be adjusted by the hand valves located on the left and right feeder guards.
DO NOT RESTRICT THE BLOW AIR TO
THE POINT WHERE IT OVERLOADS
THE VACUUM PUMP. THIS CAN CAUSE
THE MOTOR TO BE DAMAGED.
CAUTION!
4.2.4.3 Moving the Nozzles
The vacuum nozzles are held in place by ball plunger screws. To change positions, loosen the screw, then
pull the nozzle straight out. When installing them, first push the nozzle in and then tighten the screw.
To Next Page
Loading...