US3701104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Address synchronizer
Assignee: Singer Co
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Filing: 1968-09-06
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Granted: 1972-10-24
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Expires: 1988-09-06
Abstract
Abstract A synchronizer for the address counter of an on-the-fly print wheel has two flip-flops complemented by paired photoelectric signals. One flip-flop responds to all character pads, or spaces, of the wheel and the other to all but one. When the two flipflops fall out of step, a synchronizing signal is gated for setting the address counter and for also resynchronizing the two flip-flops, which then stay synchronized until the next unpaired signal.
Inventors
- 👤 Neil L Wiseman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:21
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/06; B; B41; B41J; B41J1/00; B41J1/22; B41J1/24; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/21; G05B19/23; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41241; G05B2219/45; G05B2219/45187
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
152 words
A counter synchronizer for resetting an associated counter to an initial state comprising: a pair of flip-flops; pulse train generating means coupled to said flip-flops, said means including first means for generating a first train of pulses for complementing a first one of said flip-flops and second means for generating an interrupted train of pulses each paired with the pulses of said first train for complementing the second one of said flip-flops, at least one of said first train pulses being unpaired; means coupled to said pulse train generating means for generating a sampling signal; means coupled to said flip-flops for generating a FLIP-FLOPS UNPHASED signal whenever said flip-flops are in opposite states during the occurrence of said sampling signal; and means coupled to said last-named means and responsive to the appearance of said FLIP-FLOPS UNPHASED signal for generating a reset signal for resetting said first and second flip-flops and said counter.
Claim 2
Dependent Claim
152 words
A counter synchronizer for resetting an associated counter to an initial state comprising: a pair of flip-flops; pulse train generating means coupled to said flip-flops, said means including first means for generating a first train of pulses for complementing a first one of said flip-flops and second means for generating an interrupted train of pulses each paired with the pulses of said first train for complementing the second one of said flip-flops, at least one of said first train pulses being unpaired; means coupled to said pulse train generating means for generating a sampling signal; means coupled to said flip-flops for generating a FLIP-FLOPS UNPHASED signal whenever said flip-flops are in opposite states during the occurrence of said sampling signal; and means coupled to said last-named means and responsive to the appearance of said FLIP-FLOPS UNPHASED signal for generating a reset signal for resetting said first and second flip-flops and said counter.
Claim 3
Dependent Claim
88 words
The apparatus of claim 1 wherein said pulse train generating means comprises: a source of radiation; a rotating member having a plurality of circumferentially spaced radiation modulating elements; and first and second photoelectric cells positioned adjacent the path of travel of said light modulating elements at first and second radial distances from the center of rotation of said member for receiving modulated radiation from said source, one of said modulating elements being provided with partial modulation means for modulating the radiation incident on only one of said cells.
Claim 4
Dependent Claim
34 words
The apparatus of claim 2 wherein each of said radiation modulation elements comprises an opaque pad, and said one of said modulation elements has a shorter length than the remaining ones of said elements.
Claim 5
Dependent Claim
33 words
The apparatus of claim 2 wherein each of said radiation modulating elements comprises an opaque pad, and said partial modulation means comprises an opaque inTerstitial web having a shorter length than said pads.
Claim 6
Dependent Claim
36 words
The apparatus of claim 2 wherein said rotating member comprises a print wheel having a plurality of radial spokes and each of said radiation modulating elements comprises a character pad mounted on one of said spokes.
Claim 7
Dependent Claim
25 words
The apparatus of claim 1 further including means coupled to said pulse train generating means for generating a COUNTER INCREMENT signal for incrementing said counter.
Claim 8
Dependent Claim
37 words
The apparatus of claim 1 wherein said FLIP-FLOPS UNPHASED signal generating means comprises an inverting AND-gate, the inputs of which are coupled to one preselected output from each of said flip-flops and to said sampling signal generator.
Claim 9
Dependent Claim
41 words
The apparatus of claim 1 wherein said FLIP-FLOPS UNPHASED signal generating means comprises a pair of inverting AND-gates, the input of each AND-gate being coupled to a different preselected output from each of said flip-flops and to said sampling signal generator.
Claim 10
Dependent Claim
83 words
The apparatus of claim 1 wherein said reset signal generating means comprises a first inverting AND-gate having first and second inputs, said first input being coupled to said FLIP-FLOPS UNPHASED signal generating means, a second inverting AND-gate having third and fourth inputs, said third input being coupled to said sampling signal generator, said fourth input being coupled to the output of said first inverting AND-gate, the output of said second inverting AND-gate being coupled to said second input, said counter and said flip-flops.
References Cited (Backward Citations)
US3430210A
Cited
US3395352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |