Installation and Operation Manual
Document #9620-20-b-mc-16 base tool changer-07
Pinnacle Park
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1031 Goodworth Drive
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Apex, NC 27539
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Tel: 919.772.0115
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Fax: 919.772.8259
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www.ati-ia.com
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Email: [email protected]
B - 9
3.2 Fail-Safe Operation
The manual Tool Changer features two fail-safe features. The first feature is the cam spring
feature. When the Master is locked, the cam is spring-loaded to bias it to keep it locked. This
spring prevents the cam from vibrating to the unlock position as well as allows for a quick
action lock movement when the button is pushed (see Figure 3.4).
Figure 3.4 —Fail Safe Operation (MC-36 shown)
The second fail-safe feature is the fail-safe tapered surface on the cam. As the cam is screwed
in towards lock position, the balls roll along the first taper. The first taper simply provides the
travel necessary to move towards lock. Then the balls roll past the intermediate tapered
surface and onto the final tapered surface called the lock angle. This lock angle, combined
with the tightening torque from the cam shaft, results in a high mechanical advantage and
reliable locking force. In the event that the cam shaft is accidentally loosened, the cam may
want to back out toward unlock position. If this happens, the balls will contact the
intermediate “fail-safe” taper on the cam profile, and become trapped, as the forces on the
Tool pull against the Master, the effect of this fail-safe taper strengthens. Both the cam spring
and the fail-safe cam tapered surface act together to provide a high assurance and high level
of safety.
3.3 Uncoupling
The Tool Changer should be positioned in the Tool Stand in the
same location
as that when
coupling took place.
Unscrew the cam all the way out of the lock position. Take precautions to ensure the Tool
will not fall on your fingers. The unit will not fully disengage the Tool until the cam is all the
way unscrewed. It is safe to remove the Master from the Tool only when the cam is in the
fully
unlocked position.
NOTICE:
:
If the unit is equipped with an optional ratchet knob pull out on the knob and
unscrew until the ratchet knob is past the ratcheting device on the Tool Changer body .
