Patent US4043438A successfully refreshed from Google Patents.
US4043438A
Expired / Lapsed
US
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Printing control circuit
Assignee: Monroe Systems for Business Inc
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Filing: 1976-04-27
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Granted: 1977-08-23
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Expires: 1996-04-27
Abstract
Abstract A phase-locked loop circuit for use in a printer which automatically compensates for speed changes in the print head due to changes in line frequency to maintain consistent character width print impressions.
Inventors
- 👤 Lester Avant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:44
CPC Classifications
H; H03; H03L; H03L7/00; H03L7/06; B; B41; B41J; B41J29/00; B41J29/38
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A printing control circuit comprising: a means for transmitting line voltage, a phase-lock loop circuit, the input of which is coupled to said means for transmitting line voltage, printing means, coupled to the output of said phase-lock loop circuit, and motor means, coupled to said printing means and said means for transmitting line voltage, for moving said printing means, said phase-lock loop circuit including a first and second frequency divider means, the output of said phase-lock loop circuit being coupled from between said first and second frequency divider means.
Claim 2
Dependent Claim
89 words
A printing control circuit comprising: a means for transmitting line voltage, a phase-lock loop circuit, the input of which is coupled to said means for transmitting line voltage, printing means, coupled to the output of said phase-lock loop circuit, and motor means, coupled to said printing means and said means for transmitting line voltage, for moving said printing means, said phase-lock loop circuit including a first and second frequency divider means, the output of said phase-lock loop circuit being coupled from between said first and second frequency divider means.
Claim 3
Dependent Claim
74 words
The printing control circuit of claim 1 wherein said phase-lock loop circuit additionally comprises; a phase detector, having a first input coupled to said means for transmitting line voltage, and a second input, and an output, a low-pass filter whose input is coupled to the output of said phase detector, a voltage controlled oscillator having an input coupled to the output of said low-pass filter and an output coupled to said frequency divider means.
Claim 4
Dependent Claim
23 words
The printing control circuit of claim 2 wherein said first frequency divider means divides by 50 when the line frequency is 60 Hz.
Claim 5
Dependent Claim
23 words
The printing control circuit of claim 2 wherein said first frequency divider means divides by 60 when the line frequency is 50 Hz.
Claim 6
Dependent Claim
31 words
The printing control circuit of claim 2 wherein there is a whole number relationship between the frequency of the line voltage, controlled oscillator, and the output of said phase-lock loop circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |