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MACHINE ASSEMBLIES
Enclosure/Control Panel
This enclosure/control panel is the “heart” of the machine. All machine controls are located inside the enclosure: HMI,
PLC, drives, relays, contactors, etc.
Cut and Wipe Arm:
Installed in front of the tower, this assembly is used to cut the film after the wrapping is done. It also wipes the film tail
on the load’s surface. The cut and wipe arm always works in tandem with the film clamp.
Film Clamp:
The film clamp is located at the center of the process turntable. It holds the film before the cut and wipe arm comes
and sections it.
Turntable:
This is the part that makes the load rotate. The rotation motion is achieved by the pinion-ring gear group to which it is
installed.
Frame Motor-Brake-Gearbox-Pinion-Ring Gear Group:
This group is the one that requires the most maintenance. The pinion and ring gear teeth need to be greased
manually (except with nylon pinion – no greasing necessary) whereas the bearing inside the ring gear is lubed by an
automatic greasing system.
Carriage:
Situated on the tower, the trolley travels up and down carrying the carriage in its motion. The limit switches are used
to stop the carriage at the wanted upper and lower levels; they are tripped by the adjustable stop blocks installed on
the unistrut.
Tower Motor-Brake-Gearbox Group:
This group is responsible for making the carriage trolley go up and down. Motion is assured by sprockets and chains
situated on each side of the gearbox. The chains are attached to the carriage trolley.
Film Carriage:
This machine component is responsible for delivering the film while wrapping. A motor drives two sets of gears, which
make two pairs of rollers rotate. It is these rollers and their different rotation speed that pre-stretch the film. A mandrel
is present to accept different film roll sizes. The film carriage can offer a constant film tension during the wrap process
thanks to the dancer bar assembly that regulates motor speed in relation with film demand.
Pre-Stretch Ratio Gearing:
Film pre-stretching has advantages, for instance; operation costs are reduced due to film savings and the wrap tends
to pull back after being pre-stretched, thus offering a wrap that tightens over a certain period of time. This “pre-
stretching” is possible thanks to the pulleys located on top of the film carriage. The ratio (difference in diameter) of
pulleys #1 and #2 determines the pre-stretch ratio. The analog sensor, cam and torsion spring are the three
components from the dancer bar assembly that are responsible for motor speed regulation. The safety sensor checks
if the gate is fully closed, if it is not fully closed, the machine will not start. The carriage gate opens by pressing on the
latch.
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