Press brake with mechanical-friction clutch
This is one of the most common press brakes for metal fabrication.
These clutches use a part revolution mechanical-friction clutch, usually operated
by a mechanical foot pedal or treadle.
Mechanical-friction clutches are widely used because
they give the operator control of the machine stroke by inching
and slipping the clutch. This allows the operator to drop
the slide to the workpiece and stop, adjust, or align the workpiece, then complete the stroke to bend the part.
This press also allows the operator to slip the clutch or inch
through the bottom of the stroke to avoid a quick whip-up action
of the material.
The operator is
responsible for handling the stock and operating the machine
stroke through use of a foot pedal. When a foot pedal is used
to begin the sequence, other safety devices must be used to keep
the operator's hands out of the danger zone.
|Additional Safety Measures
Guarded foot pedal in use
Operating controls should be located away from
the die area and employ dual palm
If a foot pedal
control is used, it must be guarded.
An emergency stop button should be
available with easy access to the operator and a main power disconnect switch is needed.
Power transmission components are normally located
away from the operator; however, hydraulic
pump/motor arrangements should be enclosed. [29 CFR 1910.219]
Work area should be kept clean to prevent
slipping or falling hazards.