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GEAR AND SCREW RAPID REVERSING MECHANISM

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When gear 1 rotates about fixed axis C, right-hand screws 2 and 3, keyed to shafts 11 and 12, are driven in opposite directions (clockwise and counterclockwise, respectively) by gears 5 and 4 about fixed axes A and B. Follower-roll 6 is free to turn on its bearings in cross slide 13 which moves laterally in slide 7 so that roll 6 can be shifted into engagement with either screw. When roll 6 engages screw 2, slide 7 travels to the right; when it engages screw 3, slide 7 travels to the left. Roll 6 is held in engagement with each screw by insert a which slides along one or the other side of fixed bar 8. When roll 6 reaches the end of its right-hand stroke (as shown), insert a on roll cross slide 13 has just passed the right end of bar 8, and cam lug 9, secured to the right end of screw 2, contacts a flange of roll 6, shifting the roll on cross slide 13 over into engagement with the thread on screw 3. The lug holds slide 13 in this position until the left end of insert a passes the right-hand end of bar 8 which continues to hold roll 6 in engagement with screw 3. A similar action occurs at the left end of the stroke of slide 7 where cam lug 10, secured to the left end of screw 3, shifts roll 6 into engagement with screw 2. Thus slide 7 has a continuous reciprocating motion.
$2944$CxG,ML$

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Documents: Gear mechanisms  [Streambook]
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