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Sheet Turnaround Mechanism

IP.com Disclosure Number: IPCOM000080562D
Original Publication Date: 1974-Jan-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Craft, JA: AUTHOR

Abstract

A sheet turnaround mechanism incorporates a pair of drive rolls that positively effect reversal of the sheet, while maintaining advancement of the trailing edge of the sheet in a sheet forwarding direction.

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Sheet Turnaround Mechanism

A sheet turnaround mechanism incorporates a pair of drive rolls that positively effect reversal of the sheet, while maintaining advancement of the trailing edge of the sheet in a sheet forwarding direction.

Sheets are forwarded over table 11 in the direction of arrows 13 and 14 around feed rolls 15, the sheet being deflected by deflector 17. As the sheet is thus advanced about feed rolls 15, cams 19 rotate effecting translational movement of yoke 21 to the left. Translational motion of yoke 21 effects counterclockwise motion of feed rolls 15 by gears 23 and stationary racks 25, thereby feeding the leading edge of the sheet to the right over table 27. The thusly translating and rotating feed rolls 15 cause the body of the sheet to move toward the left, while the sheet is being turned over.

When yoke 21 approaches the extreme left-hand position, deflector 17 contacts stops 29 thereby pivoting the deflector upward about shaft 31. The pivoting motion of the deflector 17 allows the trailing edge of the sheet to snap down about the feed rolls 15. When yoke 21 reaches its extreme left-hand position, it is stopped and reversed by the cams 19. The trailing edge of the sheet now becomes the leading edge as the mechanism restores to the right, and the clockwise motion of the feed rolls 15 causes further sheet advancement toward the left.

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