Browse Prior Art Database

Typewriter Keyboard Line Locking Mechanism

IP.com Disclosure Number: IPCOM000094393D
Original Publication Date: 1966-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Hickerson, JE: AUTHOR

Abstract

This typewriter keyboard line locking mechanism allows the individual keys of the keyboard to be depressed. Such mechanism prevents the depression of the keys from activating the printing element.

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Typewriter Keyboard Line Locking Mechanism

This typewriter keyboard line locking mechanism allows the individual keys of the keyboard to be depressed. Such mechanism prevents the depression of the keys from activating the printing element.

Keylever 11, provided with keybutton 13, is mounted for rotation about pivot
15. Dobber 17 is pivotedly mounted at 19 on keylever 11. Depression of keybutton 13 causes keylever 11 to rotate in a counter clockwise direction about pivot 15 causing dobber 17 to engage interposer 21 and move it downward. The downward motion of interposer 21 trips a clutch, not shown, causing filter shaft 23 to rotate in a clockwise direction. Shaft 23 drives interposer 21 to the right thus activating the printing element not shown. The downward motion of keylever 11 is also utilized to control an external device. For example, tail portion 25 of keylever 11 closes electrical switch 29 when it moves downward. The closing of switch 29 completes a circuit which causes an external device such as a tape punch to be driven.

When it is desirable to activate only the external device and inhibit printing, bail 30 is moved clockwise about pivot 31 thus causing pivoted dobber 17 to pivot to the position shown in dotted lines. Subsequent depression of keylever 11 closes switch 29 thus activating the external device, but it does not cause interposer 21 to be moved in a downward direction. Hence, the print cycle is not initiated.

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