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The mechanism shown and described provides positive controlled feeding of screw fasteners for pick-up by automated assembly devices such as a tool held by the manipulator on the IBM Robot System I.
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
72% of the total text.
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Rotary Screw Escapement
The mechanism shown and described provides positive controlled feeding of
screw fasteners for pick-up by automated assembly devices such as a tool held
by the manipulator on the IBM Robot System I.
The device shown in the figure is mounted at some suitable angle for taking
advantage of gravity feeding. Screws from a vibratory feeder bowl (not shown)
are fed through tube 2. Tube 2 is shown at 4 in cross section. A suitable rotary
actuator, such as a stepper motor, is mechanically linked to a carrier wheel 8
which is provided with at least one notch 10 for accepting a screw 12. Screw 12
in notch 10 travels with carrier wheel 8 as it rotates counterclockwise to pick-up
Operation of the described device is enhanced by the addition
of an air jet at pick-up station 14. The air jet reduces the level
of repeatability required by the pick-up tool and allows the speed at
which the screw is withdrawn to be increased. These two advantages
arise because the air jet causes a screw in the notch at pick-up
station 14 to be shot into the magnetic collar of the pick-up device.
The pick-up tool does not need to contact the screw head while it is
still in the feed mechanism.
This air-assist function may be implemented by adding a ported air duct to
the escapement device shown in the figure. As carrier wheel 8 rotates, it brings
screw-bearing notch 10 into alignment with the air port. Air at low, positive
pressure is used to eject the screw from ca...