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Print Hammer Mechanism

IP.com Disclosure Number: IPCOM000087458D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Mathews, RD: AUTHOR

Abstract

Print cycles of extremely short duration, variable energy impact and rapid rebound damping are obtained with a clapper magnet print mechanism.

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Print Hammer Mechanism

Print cycles of extremely short duration, variable energy impact and rapid rebound damping are obtained with a clapper magnet print mechanism.

Energization of coil 1 will bias arm 2 to the right about pivot 3. The force thus applied to arm 2 must overcome the resistance of roller 4 carried by spring 5 acting against arm pin 6. This resistance is adjustable by eccentric 15 which determines the initial up-down position of spring 5. When overcome, pin 6 will ride over roller 4 and spring 5 will be deflected in a clockwise direction. The resistance of roller 4 at this time rapidly approaches zero and arm 2 is rotated at high velocity into contact with adjustable damping stop 7. During this rotation of arm 2, print hammer 8 is driven to the right to impact character slug 9 for causing printing against platen 10.

Following printing, arm 2 rebounds toward damping stop 11. Pin 6 will ride over roller 4 and spring 5 will bring roller 4 back in front of pin 6 to prevent rebound of arm 2 from stop 11. Hammer 8 will restore to the left partially under the influence of spring 12 having detents riding in slot 13 of hammer 8. The remaining influence on the restoration of hammer 8 is hook spring 14 which acts against the right arm of spring 12. Spring 14 also dampens the rebound of hammer 8 when driven back into contact with arm 2.

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