Browse Prior Art Database

Paper Feed with Three Platen Positions

IP.com Disclosure Number: IPCOM000091099D
Original Publication Date: 1969-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Palmer, LE: AUTHOR

Abstract

In this paper feed for a typewriter, the platen and feed roll assembly raise from a print position to an erase position above the top of the machine cover. The paper bail is manipulated to pass the paper behind accomplished without rolling the platen or moving the type element. After erasure, the platen is lowered to the exact print position without exposing the paper to slippage between feed rolls and platen. In addition to the print position and erase position, a load position is available in which the platen is separated from the feed rolls to permit loading from the front of the machine.

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Paper Feed with Three Platen Positions

In this paper feed for a typewriter, the platen and feed roll assembly raise from a print position to an erase position above the top of the machine cover. The paper bail is manipulated to pass the paper behind accomplished without rolling the platen or moving the type element. After erasure, the platen is lowered to the exact print position without exposing the paper to slippage between feed rolls and platen. In addition to the print position and erase position, a load position is available in which the platen is separated from the feed rolls to permit loading from the front of the machine.

The right end of platen 15 is shown in the load position in drawing A. The left end of platen 15 is shown in the erase position in drawing B. The print position is not illustrated, but in that position adjustable ear 18 on the machine frame is contacted by a surface on paper feed side frame 20. Also, latches 21 and 21a are engaged with keepers 22 adjustably mounted to side frame 23 which is fixed to the machine frame. With latches 21 and 21a engaged, the usual index mechanism, not shown, operates on ratchet 24 which is keyed to detent ratchet 25 which is clutched to platen 15 in a normal manner. Detent 26 stays engaged with its ratchet at all times to reduce the possibility of unwanted rotation. Additionally, paper release lever 27 operates in a normal manner without lifting platen 15 from surface 18.

Latches 28 and 28a act on rollers 30 to force platen 15 into engagement with the feed roll mec...