Through this process, the engine revolution is changed to the pendulum revolution suitable for
compacting.
The vibrator pulley rotates the pendulum axis of the drive side. The two pendulums inside the
vibrator are fixed to the two pendulum axes that are positioned in parallel and are connected
with the gear. The two axes rotate in opposite directions at the same speed to generate vibra-
tion.
There is a spiral groove on the inner periphery of the gear assembled on the pendulum axis to
be driven. This groove serves as a key groove to let the guide pin slide to the axis direction.
This guide pin is connecting the two pendulum axes. The phase of the two pendulums is
changed by the axial sliding of the guide pin. The change in phase causes the vibration to
change directions, thus changing the speed and travel direction of the machine.
Hydraulic pressure is used for the axial movement of the guide pin. At the end of the groove
where the guide pin is attached, a piston is installed. When the oil level rises inside the hydrau-
lic cylinder on the vibrator side and the pressure increases, the piston is pushed. Then the axis
connected to the piston is pushed, which causes the guide pin attached to the axis to move,
resulting in a change in phase.
The operator of the machine, by using the back and forth motion lever of the handle, can adjust
the oil quantity and pressure by the connected hand pump to get the travel speed suitable for
the work.
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