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Platen-Driven Paper Bail Closer

IP.com Disclosure Number: IPCOM000040041D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Kroeker, EB: AUTHOR

Abstract

An arrangement is described and shown in Fig. 1 in which the paper bail of a printer is closed by the same drive that indexes the platen. Platen 1, shown in Fig. 1, is driven by platen gear 2 that is affixed to the platen shaft. The platen drive gear 3 is engaged with the platen gear and causes platen rotation. The bail cam and gear assembly 4 is also mounted on the platen shaft, but is free to rotate. The bail arm assembly 6 is spring-loaded by spring 5 against the platen. Fig. 2 is the normal state, in which the platen can be driven in either direction and the paper bail is against the platen. When a sheet of paper 8 is inserted to the pinch 9, the paper bail 7 is then manually pulled to an open position.

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Platen-Driven Paper Bail Closer

An arrangement is described and shown in Fig. 1 in which the paper bail of a printer is closed by the same drive that indexes the platen. Platen 1, shown in Fig. 1, is driven by platen gear 2 that is affixed to the platen shaft. The platen drive gear 3 is engaged with the platen gear and causes platen rotation. The bail cam and gear assembly 4 is also mounted on the platen shaft, but is free to rotate. The bail arm assembly 6 is spring-loaded by spring 5 against the platen. Fig. 2 is the normal state, in which the platen can be driven in either direction and the paper bail is against the platen. When a sheet of paper 8 is inserted to the pinch 9, the paper bail 7 is then manually pulled to an open position. As the bail opens, the cam and gear assembly rotates clockwise (cw) by the urging of the off-center weight in the cam and gear assembly. This cw rotation continues until the section without gear teeth passes the platen drive gear, as in Fig. 3. Gear engagement is now pending. When the paper bail is then released by the operator, the bail cam and gear assembly will hold the

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bail open, as in Fig. 4. As the paper is now indexed into the printer by the action of the platen drive gear and the platen gear, the bail cam and gear assembly will also engage the platen drive gear, urged by the weight in the cam and also by the torque component due to the bail arm against the cam. As the indexing processes continue, the bail...