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Keyboard Printer With Paper Advance from Print Obscuring Position

IP.com Disclosure Number: IPCOM000085528D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Mizzi, JV: AUTHOR

Abstract

In a keyboard printer, the print mechanism may block the character position on the paper from the view of the keyboard operator. In order to see what has just been printed, the operator may manually advance the paper a few lines and then return the paper to continue printing. The apparatus of the drawing performs this operation.

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Keyboard Printer With Paper Advance from Print Obscuring Position

In a keyboard printer, the print mechanism may block the character position on the paper from the view of the keyboard operator. In order to see what has just been printed, the operator may manually advance the paper a few lines and then return the paper to continue printing. The apparatus of the drawing performs this operation.

A drive wheel 2 is attached to the shaft 3 of the platen of the printer. A solenoid 4 moves a friction drive plunger between a position 5 that is shown in solid lines and a position 5' that is shown in dashed lines. As the plunger moves from position 5 to position 5', it frictionally engages the drive wheel 2 and rotates wheel 2 clockwise to move the paper up by a few spaces.

When the plunger is returned to position 5, it rotates drive wheel 2 counterclockwise to bring the paper down to printing position. Rollers 6 support drive wheel 2 against the upward force of the plunger. Thus, these components move the paper up into a viewing position and down into a printing position, as would otherwise be done manually by a keyboard operator.

Solenoid 4 receives a down signal from an AND gate 8 and an up signal from an OR gate 9. AND gate 8 responds to the coincidence of the signal Keyboard Unlock and a signal Any Key, so that the paper is moved down to the printing position whenever the operator strikes a character key unless the keyboard is locked.

An AND gate 10 responds to the c...