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Class Information
Number: 400/124.21
Name: Typewriting machines > Typing by other than type-face or type-die > Character formation by impact (e.g., wire matrix) > Printhead > With actuator > Actuator having electromagnet > With biasing means
Description: Subject matter including resilient means acting to move the impact members against the force exerted by the magnetic* field.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6779935 |
Printer hammerbank with a magnetic shunt |
Aug. 24, 2004 |
| 6695495 |
Constant density printer system |
Feb. 24, 2004 |
| 5975776 |
Dot matrix print head with unitary armature assembly and method of operation thereof |
Nov. 2, 1999 |
| 5651621 |
Wire dot print head with print wires fixed to tip portions of armatures differentiated in resiliency |
Jul. 29, 1997 |
| 5454649 |
Wire printhead with armature biasing mechanism |
Oct. 3, 1995 |
| 5370467 |
Print head for dot matrix printer |
Dec. 6, 1994 |
| 5368401 |
Wire dot print head with rotating lever |
Nov. 29, 1994 |
| 5335999 |
Printer hammerspring |
Aug. 9, 1994 |
| 5228386 |
Print hammer assembly for dot line printer |
Jul. 20, 1993 |
| 5216950 |
Vibration frame for print elements of a matrix line printer |
Jun. 8, 1993 |
| 5215390 |
Matrix pin print head |
Jun. 1, 1993 |
| 5213423 |
Printer with impact dot head |
May. 25, 1993 |
| 5188467 |
Print head with energizing and return leaf springs |
Feb. 23, 1993 |
| 5165808 |
Wire dot print head |
Nov. 24, 1992 |
| 5056941 |
Print head assembly of a printing device |
Oct. 15, 1991 |
| 5054942 |
Wire printing head with unitary return group |
Oct. 8, 1991 |
| 5039236 |
Print head with tapered conical return spring |
Aug. 13, 1991 |
| 5000593 |
Matrix pin print head of the hinged-clapper-armature construction |
Mar. 19, 1991 |
| 4986179 |
Print head for dot matrix printers |
Jan. 22, 1991 |
| 4976554 |
Release-type dot print head and method of manufacturing the same |
Dec. 11, 1990 |
| 4925625 |
Dot print head having a torsion bar with elastic portions |
May. 15, 1990 |
| 4884905 |
Print head incorporating one piece armature with intermediate clamping pads |
Dec. 5, 1989 |
| 4869605 |
Wire-dot printing head with adjustable spring force |
Sep. 26, 1989 |
| 4820065 |
Wire-type printing head |
Apr. 11, 1989 |
| 4798488 |
Dot matrix print head |
Jan. 17, 1989 |
| 4792247 |
Armature supporting structure of a print head |
Dec. 20, 1988 |
| 4778292 |
Dot print head with restrained rebound of armature |
Oct. 18, 1988 |
| 4771689 |
Unitary spring armature for a dot matrix printer |
Sep. 20, 1988 |
| 4744682 |
Needle printing head |
May. 17, 1988 |
| 4704041 |
Print head having rolled spring arms with uniform response |
Nov. 3, 1987 |
| 4692043 |
Wire dot-printing head |
Sep. 8, 1987 |
| 4687354 |
Dot matrix printer head |
Aug. 18, 1987 |
| 4682903 |
Thin line printer typing head |
Jul. 28, 1987 |
| 4669898 |
Dot matrix print head |
Jun. 2, 1987 |
| 4652158 |
Armature support device for torsion spring print head |
Mar. 24, 1987 |
| 4634301 |
Print head with torsion spring |
Jan. 6, 1987 |
| 4629343 |
Matrix printing device |
Dec. 16, 1986 |
| 4625638 |
Dot matrix line printer |
Dec. 2, 1986 |
| 4626116 |
Head for wire dot printer |
Dec. 2, 1986 |
| 4624589 |
Dot printer head |
Nov. 25, 1986 |
| 4618277 |
Print head |
Oct. 21, 1986 |
| 4610553 |
Leaf spring unit for a dot matrix printer |
Sep. 9, 1986 |
| 4584937 |
Long release coil hammer actuating mechanism |
Apr. 29, 1986 |
| 4555192 |
Release type dot printer head |
Nov. 26, 1985 |
| 4553863 |
Method and arrangement for tolerance compensation in matrix printing devices |
Nov. 19, 1985 |
| 4548522 |
Print head for a dot matrix printer |
Oct. 22, 1985 |
| 4531848 |
Dot matrix print head |
Jul. 30, 1985 |
| 4527469 |
Dot matrix print actuator |
Jul. 9, 1985 |
| 4511269 |
Cancel type printing head |
Apr. 16, 1985 |
| 4462702 |
Dot matrix line printer |
Jul. 31, 1984 |
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