Browse Prior Art Database

Catch for Prevention of Multiple Printing

IP.com Disclosure Number: IPCOM000094529D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Binkhuysen, TC: AUTHOR

Abstract

This print hammer has a special pawl. It is adapted to move to an upper and lower position on a pin sliding in a crooked slot in the pawl. The slot is thus positioned so that in the upper position the pawl is farther from the hammer than in its lower position.

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Catch for Prevention of Multiple Printing

This print hammer has a special pawl. It is adapted to move to an upper and lower position on a pin sliding in a crooked slot in the pawl. The slot is thus positioned so that in the upper position the pawl is farther from the hammer than in its lower position.

In the lower position the pawl prevents the hammer from reaching the type, drawing 6. The pawl is moved to the upper position by the hammer itself, as the pawl is engaged by a notch in the hammer with the aid of a weak spring when the hammer is brought back to its home position, drawings 1 and 2.

While moving forward the hammer lifts the pawl to the upper position so that the hammer is not prevented from printing, drawing 3.

However, just before printing the pawl is disengaged from the notch in the hammer, drawing 4. When the hammer moves away from the type the pawl returns to its lower position, drawing 5. If the hammer should move forward again due to bouncing against the hammer driver, it will be prevented from printing again in consequence of the pawl being in its lower position.

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