US4459050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo control system for carriage of matrix printer
Assignee: CHROMA SAN JOSE CA A CORP OF
•
Filing: 1982-04-21
•
Granted: 1984-07-10
•
Expires: 2002-04-21
Abstract
Abstract A servo control system for the carriage of a matrix impact printer allows printing to occur during both acceleration and deceleration of the carriage. This is especially useful where the carriage is transporting several ribbon cartridges of different colors. In addition, printing may occur during the midrange portion of the carriage which is driven at a variable velocity to compensate for differences in printing and resolution requirements.
Inventors
- 👤 Edward M. Goldberg
- 👤 Larry R. Herzberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:19
CPC Classifications
B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/202
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
A servo control system for the carriage of a matrix impact printer where the carriage in addition to carrying a print head carries a plurality of ribbon cartridges, said system comprising: a motor controller for driving said carriage; means for sensing the actual velocity and position of said carriage; means for determining a target velocity including means, for storing in advance of printing, binary data representing a line or raster of printing, said binary data also being related to predetermined pins of said matrix, and means for computing the distance along the line of printing for the two closest dots to be printed by said pins with respect to a predetermined zone portion of said line, and utilizing said distance to determine said target velocity for said zone; means for comparing said actual and target velocities to provide an error signal which drives said motor controller for said carriage.
Claim 2
Dependent Claim
149 words
A servo control system for the carriage of a matrix impact printer where the carriage in addition to carrying a print head carries a plurality of ribbon cartridges, said system comprising: a motor controller for driving said carriage; means for sensing the actual velocity and position of said carriage; means for determining a target velocity including means, for storing in advance of printing, binary data representing a line or raster of printing, said binary data also being related to predetermined pins of said matrix, and means for computing the distance along the line of printing for the two closest dots to be printed by said pins with respect to a predetermined zone portion of said line, and utilizing said distance to determine said target velocity for said zone; means for comparing said actual and target velocities to provide an error signal which drives said motor controller for said carriage.
Claim 3
Dependent Claim
29 words
A servo control system as in claim 1 including means for utilizing said raster data to determine the number of overstrikes on a printing ribbon for advancing such ribbon.
Claim 4
Dependent Claim
19 words
A system as in claim 1 where said actual and target velocities are expressed in a digital binary format.
References Cited (Backward Citations)
US4280767A
Cited
US4326813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |