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GEAR AND SCREW REVERSING MECHANISM OF A BOBBIN WINDING FRAME

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Screw 1, having right- and left-hand threads, and nuts with plates 2 and 3, together with the bobbin carriage, are reciprocated vertically by a special mechanism (not shown). Reversing dogs 4, rigidly mounted on shaft 17, prevent rotation of the shaft while the dogs slide along the plates of links 2 and 3. As soon as one of the dogs 4 passes the end of a bar of link 2 or 3, shaft 17 is turned by lever 5 and link 6, keyed to shaft 17 and comprising two bevel gear segments, is brought into mesh with bevel gear 7. Rotation is transmitted through spur gears 8, 9, 10, 11 and 12, rack 13, gears 14, 15 and 16 to screw 1 and, as a result, the distance is reduced between links 2 and 3. After making one-half revolution, gear 6 stops and the carriage with the bobbin is reversed. When it has travelled a certain distance, rack 13, by means of a certain mechanism (not shown), reduces the angular velocity of the bobbin. Upon each reversal of shaft 17, the angular velocity of the bobbin is reduced due to the displacement of rack 13 and the stroke of the carriage is reduced because links 2 and 3 are brought closer and closer together. This imparts the required shape to the roving wound onto the bobbin. Depending upon the thickness of the roving being wound, gear 10 is engaged to gear 11, 11' or 11".
$2976$CxG,FD$

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Documents: Gear mechanisms  [Streambook]
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