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Crossgard
Overload Clutches & Overload Couplings |
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The
Crossgard series of overload protection clutches all use sprung loaded balls
locked in detents to provide drive and overload control. The balls are random
positioned in the clutch so drive can only be engaged in one relative angular
position between driver and driven shafts, so ensuring full synchronisation
of the drive at all times. In the event of an overload the balls are driven
out of their detents to release the torque, and cause axial movement of the
pressure plate which can be used to actuate a limit switch or proximity sensor
to isolate the drive. All units are fitted with a torque indicator to enable
simple setting of the desired torque rating. There are three basic types of
Crossgard Clutches all of which are available as flexible shaft couplings,
types CG, CGX and CGZ. |
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Type
CG Crossgard Clutch
CG
Crossgard Clutches are a low cost, simple design
suitable for general purpose applications. The clutches
provide full overload protection of drives which require
synchronisation to be maintained at all times. Following
overload the clutches are automatically reset by slow
rotation of input drive once the overload cause is cleared.
Seven sizes of clutch provide a torque range 10Nm to
7150Nm with operating speeds to 700rpm. Torque settings
are accurate to ±10% even after repeated tripping.
Also can be supplied with roller chain or elastomeric
coupling.
Use Crossgard CG Clutches :-
In general purpose applications.
Where drives are inaccesible,
For chain and low speed belt drives,
In wrapping and packaging machines,
on bakery and bottling machines,
for conveyors and on sliding doors. |
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CGX Crossgard Clutch |
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High
technology and precision is demanded in indexing
and the position of equipment in modern machinery.
The CGX Crossgard satisfies the demands for precision
and performance and provides overload protection for
modern machinery. CGX Clutches through their unique
design provide backlash free, fail-safe, overload
protection. High precision of trip torque is obtained
with settings within ±3% accuracy, and very little
motion is lost during tripping. An innovative ball and
wedge mechanism is used to prevent backlash, and this
is further employed in the coupling version to
compensate for angular or parallel error or axial
displacement with no loss in torsional rigidity.
Five sizes of clutches and couplings have range
1.7 Nm to 785 Nm with maximum shaft speeds of 1400rpm.
Units automatically reset after overload by slow
shaft rotation.
Use
Crossgard CGX Clutch :-
For precision positioning indexing drives,
for accurate mechanical overload protection,
for zero backlash drives,
on output shafts on cam boxes and Geneva mechanisms,
on servo motor drives and robotics,
in printing machinery
on N.C. machine tools and machining centres. |
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Type
CGZ Crossgard Clutch
The CGZ Clutches incorporate a locking mechanism which restrains
spring pressure being applied to the driving balls following an
overload. Following an overload the input drive can continue to
rotate freely enabling the clutch to be used for shaft speeds up to
1800 rpm. After the machine has been stopped following an overload
the CGZ can only be reset by applying an axial load on the pressure
plate. The clutch can also be used as an on-off clutch. Four sizes have
torque range 2.4 Nm to 450 Nm, with accuracy ±10%. An elastomeric
coupling is also available.
Use Crossgard CGZ Clutches :-
For high speed drives - direct motor shaft,
where manual re-engagement preferred,
as ON-OFF clutch,
for machine tool drives,
on textile and paper making machinery. |
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