Claims
- 1. A method of fabricating a high speed pin actuator for dot matrix printing which comprises:
- providing a permeable core structure which is generally U-shaped with one leg of the U being shorter than the other, the end of the other leg constituting a pole piece;
- mounting a permanent magnet on said shorter leg and a permeable plate over said magnet which together make the length of said one leg substantially equal to the length of the pole piece leg;
- finishing the end of the pole piece leg and said plate together to form a common plane;
- providing a permeable bridge member which has a flat surface adapted to mate with said plate and which is adapted to extend therefrom to a region adjacent the pole piece, said bridge member being bifurcated generally in the plane of the U-shaped core structure;
- mounting to said bridge structure, on the side opposite said flat surface, a plate-like spring, the rest position of said spring being generally parallel to said flat surface, said spring carrying an armature adapted to extend through the bifurcation in the bridge structure;
- deflecting said spring an amount corresponding to the desired throw of a printing pin;
- while said spring is so deflected, finishing the portion of the armature extending through said bifurcation to a common plane with said flat surface;
- mounting a coil on said core, a printing pin on said spring, and said bridge on said U-shaped magnet structure, thereby forming an actuator assembly.
- 2. A method of fabricating a high speed pin actuator for dot matrix printing which comprises:
- providing a permeable core structure which is generally U-shaped with one leg of the U being shorter than the other, the end of the other leg constituting a pole piece;
- mounting a permanent magnet on said shorter leg and a permeable plate over said magnet which together make the length of said one leg substantially equal to the length of the pole piece leg;
- finishing the end of the pole piece leg and said plate together to form a common plane;
- providing a permeable bridge member which has a flat surface adapted to mate with said plate and which is adapted to extend therefrom to a region adjacent the pole piece, said bridge member being bifurcated generally in the plane of the U-shaped core structure;
- mounting to said bridge member, on the side opposite said flat surface, a plate-like spring, the rest position of said spring being generally parallel to said flat surface, the adjacent bifurcated portion of the bridge member between the spring and the pole piece being shaped to conform with a deflected position of said spring corresponding to a desired throw of a printing pin, said spring carrying an armature adapted to extend through the bifurcation in the bridge member and a thin shim of a wear resistant material which is interposed between the spring and the bifurcated portion of the bridge member;
- deflecting said spring into contact with said shaped portion of said bridge member through said shim;
- while said spring is so deflected, finishing the portion of the armature extending through said bifurcation to a common plane with said flat surface;
- mounting a coil on said core;
- mounting a printing pin on said spring; and
- mounting said bridge on said U-shaped magnet structure with a thin interposed shim providing a predetermined air gap between said armature and said pole piece when said spring is in its deflected position.
- 3. A method of fabricating a high speed pin actuator for dot matrix printing which comprises:
- providing a permeable core structure which is generally U-shaped with one leg of the U being shorter than the other, the end of the other leg constituting a pole piece;
- mounting a permanent magnet on said shorter leg and a permeable plate over said magnet which together make the length of said one leg substantially equal to the length of the pole piece leg;
- finishing the end of the pole piece leg and said plate together to form a common plane;
- providing a permeable bridge member which has a flat surface adapted to mate with said plate and which is adapted to extend therefrom to a region adjacent the pole piece, said bridge member being bifurcated generally in the plane of the U-shaped core structure;
- mounting to said bridge member, on the side opposite said flat surface, a plate-like spring, the rest position of said spring being generally parallel to said flat surface, said spring carrying an armature adapted to extend through the bifurcation in the bridge member, the adjacent portion of the bridge member between the spring and the pole piece being shaped to conform with a deflected position of said spring corresponding to a desired throw of a printing pin;
- deflecting said spring into contact with said shaped portion of said bridge member;
- while said spring is so deflected, finishing the portion of the armature extending through said bifurcation to a common plane with said flat surface;
- mounting a coil on said core, a printing pin on said spring, and said bridge on said U-shaped magnet structure, thereby forming an actuator assembly.
REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of patent application Ser. No. 458,306, filed Jan. 17, 1983, now abandoned, entitled "Print Pin Actuator and Method of Making Same" and which is assigned to the same assignee as this application.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4225250 |
Wagner et al. |
Sep 1980 |
|
4233984 |
Barrus et al. |
Nov 1980 |
|
4433927 |
Cavallari |
Feb 1984 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
458306 |
Jan 1983 |
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