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Function Printing Interlock

IP.com Disclosure Number: IPCOM000092604D
Original Publication Date: 1966-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Van Avery, CN: AUTHOR

Abstract

An interlock is provided for a business machine, such as an electric typewriter, to prevent printing when a function operation, such as a tabulation or backspacing operation, is in process. When function keylever 10 is depressed, its extension 11 engages and rotates interlock lever 12 mounted on shaft 13. Rotation of shaft 13 positions latch member 14 in front of cycle clutch trip lever 15. At this time lever 15 cannot be actuated in response to depression of a character keylever and printing is prevented.

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Function Printing Interlock

An interlock is provided for a business machine, such as an electric typewriter, to prevent printing when a function operation, such as a tabulation or backspacing operation, is in process. When function keylever 10 is depressed, its extension 11 engages and rotates interlock lever 12 mounted on shaft 13. Rotation of shaft 13 positions latch member 14 in front of cycle clutch trip lever
15. At this time lever 15 cannot be actuated in response to depression of a character keylever and printing is prevented.

As keylever 10 is depressed, function interposer 16 moves down, is released and travels to the rear to initiate the function operation. This permits spring- biased, U-shaped lever 17 to rotate clockwise. One arm of lever 17 engages and rocks bellcrank 18. The latter's arm 19 moves from latching surface 20 and permits lever 21 to pivot clockwise under the action of spring 22. Tab 23 of lever 21 moves into blocking relation relative to lever 12 which prevents the latter from returning to its initial position.

The pivotal movement of lever 21 drives link 24 to the rear to rotate bellcrank 25 counterclockwise. Sensing arm 26 of bellcrank 25 moves to a position where it is adapted to be engaged by one arm 27 of unlatching member 28 after the function operation is completed. Member 28 is rigidly connected to the operational shaft of the business machine. The desired function is completed within 180 Degrees of rotation of this shaft.

Engage...