Patent US4941001A successfully refreshed from Google Patents.
US4941001A
Expired / Lapsed
US
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Non-impact dot print head with reset
Assignee: Eastman Kodak Co
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Filing: 1989-07-26
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Granted: 1990-07-10
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Expires: 2009-07-26
Abstract
Abstract A dot printer includes a print head with a plurality of recording elements, a power supply for driving the recording elements, a source of logic supply voltage, a source of data signals, and means for supplying a first reset signal to the print head to place the recording elements in a safe state in the absence of data signals. To provide for the protection of the recording elements in the event of a power drop even if no reset signal is received from the printer, a second reset signal source is provided on the print head to place the recording elements in a safe state in the absence of data signals if the logic supply voltage goes below a predetermined value.
Inventors
- 👤 Martin Potucek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:58
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1238; G06K15/1242; G06K15/1247
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
99 words
A dot printer comprising: a print head with a plurality of recording elements; a power supply for driving the recording elements; a source of logic supply voltage; a source of data signals; means for supplying a first reset signal to the print head to place the recording elements in a safe state in the absence of data signals; and means on the print head for supplying a second reset signal to the print head to place the recording elements in a safe state in the absence of data signals if the logic supply voltage goes below a predetermined value.
Claim 2
Dependent Claim
99 words
A dot printer comprising: a print head with a plurality of recording elements; a power supply for driving the recording elements; a source of logic supply voltage; a source of data signals; means for supplying a first reset signal to the print head to place the recording elements in a safe state in the absence of data signals; and means on the print head for supplying a second reset signal to the print head to place the recording elements in a safe state in the absence of data signals if the logic supply voltage goes below a predetermined value.
Claim 3
Dependent Claim
44 words
A dot printer as defined in claim 1 wherein: the print head has a particular minimum logic supply voltage level at which response is guaranteed; and the predetermined value is approximately equal to the guaranteed minimum logic supply voltage level for the print head.
Claim 4
Dependent Claim
34 words
A dot printer as defined in claim 1 further comprising means for maintaining the second reset signal until the logic supply voltage goes above a second predetermined value greater than the first predetermined value.
Claim 5
Dependent Claim
33 words
A dot printer as defined in claim 3 further comprising means for maintaining the second reset signal for a predetermined time delay after the logic supply voltage goes above the second predetermined value.
Claim 6
Dependent Claim
18 words
A dot printer as defined in claim 1 wherein the first and second reset signals are logically OR'ed.
Claim 7
Dependent Claim
88 words
For use with a dot printer of the type having a power supply, a source of logic supply voltage, a source of data signals, and means for supplying a first reset signal to place the printer in a safe state in the absence of data signals; and a print head comprising: a plurality of recording elements; means for supplying a second reset signal to place the recording elements in a safe state in the absence of data signals if the logic supply voltage goes below a predetermined value.
Claim 8
Dependent Claim
88 words
For use with a dot printer of the type having a power supply, a source of logic supply voltage, a source of data signals, and means for supplying a first reset signal to place the printer in a safe state in the absence of data signals; and a print head comprising: a plurality of recording elements; means for supplying a second reset signal to place the recording elements in a safe state in the absence of data signals if the logic supply voltage goes below a predetermined value.
Claim 9
Dependent Claim
44 words
A print head as defined in claim 6 wherein: said print head has a particular minimum logic supply voltage level at which response is guaranteed; and the predetermined value is approximately equal to the guaranteed minimum logic supply voltage level for the print head.
Claim 10
Dependent Claim
34 words
A print head as defined in claim 6 further comprising means for maintaining the second reset signal until the logic supply voltage goes above a second predetermined value greater than the first predetermined value.
Claim 11
Dependent Claim
33 words
A print head as defined in claim 8 further comprising means for maintaining the second reset signal for a predetermined time delay after the logic supply voltage goes above the second predetermined value.
Claim 12
Dependent Claim
18 words
A print head as defined in claim 1 wherein the first and second reset signals are logically OR'ed.
Claim 13
Dependent Claim
30 words
A print head having: means for receiving a logic supply voltage; and reset signal generation means for producing a reset signal when the logic supply voltage crosses a predetermined level.
Claim 14
Dependent Claim
30 words
A print head having: means for receiving a logic supply voltage; and reset signal generation means for producing a reset signal when the logic supply voltage crosses a predetermined level.
Claim 15
Dependent Claim
44 words
A print head as defined in claim 11 wherein: said print head has a particular minimum logic supply voltage level at which response is guaranteed; and the predetermined value is approximately equal to the guaranteed minimum logic supply voltage level for the print head.
References Cited (Backward Citations)
US4279523A
Cited
US4750101A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |