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Browse Prior Art Database

Rotary Screw Escapement

IP.com Disclosure Number: IPCOM000046340D
Original Publication Date: 1983-Jul-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Booker, SE: AUTHOR

Abstract

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.

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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 station 14.

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The air jet reduces the level of repeatability required by the pick-up tool and allows the speed at which the screw is withdrawn to be increased.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...