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High Velocity Print Actuator

IP.com Disclosure Number: IPCOM000062297D
Original Publication Date: 1986-Nov-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Wallace, JE: AUTHOR [+2]

Abstract

Using a tandem structure of armature and print hammer, where the armature is partly within the coil and reaches full velocity prior to striking the print hammer, provides very high speed print actuation with efficient energy transfer when there is good impedance matching between the armature and hammer. The print actuator includes hammer 1 and armature 2, each pivoted for rotation. Armature 2 receives its energy when coil 4, located on electromagnet 3, is energized. When hammer 1 is struck by armature 2, it moves from backstop 5 to perform an impact printing operation when paper 6 and ribbon 7 are compressed against type 8. When it is desired to print a character, coil 4 is energized. The armature 2, which is not in contact with hammer 1, moves towards print hammer 1.

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High Velocity Print Actuator

Using a tandem structure of armature and print hammer, where the armature is partly within the coil and reaches full velocity prior to striking the print hammer, provides very high speed print actuation with efficient energy transfer when there is good impedance matching between the armature and hammer. The print actuator includes hammer 1 and armature 2, each pivoted for rotation. Armature 2 receives its energy when coil 4, located on electromagnet 3, is energized. When hammer 1 is struck by armature 2, it moves from backstop 5 to perform an impact printing operation when paper 6 and ribbon 7 are compressed against type 8. When it is desired to print a character, coil 4 is energized. The armature 2, which is not in contact with hammer 1, moves towards print hammer 1. When the armature 2 attains its maximum velocity, it then impacts the hammer 1, transferring its energy to hammer 1. The voltage pulse is removed when the armature 2 attains its maximum velocity. The print hammer 1, which is in free flight, then impacts the paper 6 and ribbon 7 to print a character on paper 6. After printing, the hammer returns to the rest position due to rebound velocity and the energy in the return mechanism, which may be a permanent magnet or return spring. This structure has a number of advantages: 1. Faster seal time and faster flight time are inherent in the design as the input electrical energy is required only to move the mass of the armature rat...