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Print Hammer Design

IP.com Disclosure Number: IPCOM000081820D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Gilbert, RL: AUTHOR [+4]

Abstract

In the print hammer illustrated in Fig. 1 additional mass was added above the impact surface of the hammer. This combined with a specific hammer stiffness improved the print quality by increasing the print momentum and eliminated double impact.

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Print Hammer Design

In the print hammer illustrated in Fig. 1 additional mass was added above the impact surface of the hammer. This combined with a specific hammer stiffness improved the print quality by increasing the print momentum and eliminated double impact.

The hammer consists of section 1 which is the part of the hammer that is utilized in the magnetic section. Section 1 has a hooked extension 3 which permits the hammer to operate inside the coil for maximum efficiency. In addition, a notch 4 is provided in section 1 to allow he hammer to operate further inside the coil without increasing the hammer mass. The cross-sectional area of this part of the hammer is slightly smaller than the cross-sectional area of the core to provide adequate clearance between the coil and the hammer. The cross-sectional reduction was minimized to provide optimum performance.

Section 2 of the print hammer, which is exterior to the magnetic section, has been designed such that its mass distribution and stiffness provide the desired mechanical and operating characteristics. The hammer face 5 may cover either a single print position or multiple print positions. The design is such that the travel at the hammer face 5 is approximately twice the travel at the pole face area 6. Additional mass 7 has been added above the hammer impact surface to:
1. Improve print quality
2. Eliminate double impact when printing on

all part forms.
3. Optimize contact time
4. Optimize flight time
5. Opti...