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A linear screw escapement mechanism is provided which allows controlled, positive feeding of screw fasteners for pick-up by an automated assembly device.
English (United States)
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Linear Screw Escapement
A linear screw escapement mechanism is provided which allows controlled,
positive feeding of screw fasteners for pick-up by an automated assembly device.
The screw feeder separates and presents screw fasteners for pick- up by a
magnetic collar driver. The mechanism is mounted at approximately 30OE with
respect to horizontal, and receives screws from a vibratory bowl (not shown)
through feeder tube 2, shown in cross section at 4. A screw is removed from the
device at position 6.
A linear actuator, such as an air cylinder or electric solenoid, actuates a
linkage in a see-saw manner to control the advance of screws in tube 2 to
position 6. Gate means 8 is raised and lowered into tube 2 by arm 10. Similarly,
gate 12 is raised and lowered relative to a screw and tube 2 by the action of arm 14. Arms 10 and 14 are each pivotally connected to rod 16 which moves in the
direction shown by the arrow. The linkage is such that gates 8 and 12 alternate
in position, that is, when gate 12 is up, gate 8 is down, and vice versa. Gates 8
and 12 are biased in the down position so that as rod 16 reciprocates, arms 10
and 14 push up and allow the gates to return to their lowered position under
This mechanism has proved to be highly resistive to jams and positive in
action in permitting one screw per cycle to move to pick-up station 6.
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