DE-STA-CO Output Overload Clutches Type F, FC, S, C, D, FC-SD, C-SD - Manual (Page 2)

INSTALLATION, OPERATION AND
MAINTENANCE INSTRUCTIONS
SAFETY INSTRUCTIONS
1. Read your Overload Clutch Installation-
Operation Instructions thoroughly before
operating the unit, for your safety and the
protection of your unit.
2. CAMCO Overload Clutches are designed to
protect the Index Drive only and will not
protect against bodily injury.
3. Double check to be sure the power is off
and cannot be turned on while working on
the equipment.
4. Use extreme caution with jammed or unbal-
anced loads, which when cleared may set
the machine in motion.
5. Keep all objects such as hands, clothing,
tools away from rotating or moving parts.
6. Use safety glasses or equivalent to protect
your eyes.
7. Dowel pins and mounting screws must not
protrude from the drive plate or driven
member as the clutch could become a solid
coupling.
8. High humidity, contaminants, or wash down
applications may cause rust within the
clutch, resulting in operational failure.
Lubricate every six months or more fre-
quently as the application requires.
9. The CAMCO clutch is not a "FAIL SAFE"
device and cannot be used on "overhauling"
or "holding" load applications.
The above list includes major safety points to
be observed, but should not be considered as
limiting in safety precautions to be followed.
OPERATING PRINCIPLE
CAMCO Overload Clutches are designed
for mounting on the output member of the
CAMCO Index Drive. An Index Drive is essen-
tially a variable ratio speed reducer. Each index
provides an incremental output to input torque
ratio, which may range from 1:1 in the center of
the motion, to as high as 1000:1 in the begin-
ning or end of the motion. As output torque
equals input torque times the ratio, a clutch
mounted on the input side provides no protec-
tion at the beginning or end of the motion.
CAMCO Overload Clutches provide zero
backlash, high rigidity, low inertia and are
specifically designed to be used in conjunction
with CAMCO Index Drives.
Power is transmitted from the Index Drive
through the body of the CAMCO Overload
Clutch. The body contains spring loaded
tapered plungers that engage in mating ta-
pered seats in the drive plate. (See Fig. 1.)
Torque settings are determined by the pressure
the calibrated springs "seat" the plungers.
When an overload occurs, which exceeds the
torque setting of the clutch, the breakaway
friction between the tapered plunger and the
tapered seat, forces the plungers outward from
their seats. The movement of the plungers
elevates the detector plate, actuating the limit
switch. (See Fig. 2.)
The CAMCO Overload Clutch always resets in
its original position, making it an excellent
choice on applications that must remain
registered or timed.
SWITCH NORMALLY
CLOSED
DETECTOR
PLATE
DRIVE PLATE
PLUNGER
DRIVE PLATE
DRIVING
POSITION,
TYPICAL FOR
EACH PLUNGER
BODY
SWITCH OPEN
WITHIN 0.008"
DEFLECTION OF
DETECTOR PLATE
PLUNGER
DRIVE PLATE
OVERLOAD POSITION,
DETECTOR PLATE IS
MOVED AXIALLY TOWARD
SWITCH BY TRAVEL OF
PLUNGERS
Fig.1
Fig.2
2