US3798609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic shift register for staggered printing head
Assignee: RAPIFAX CO
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Filing: 1972-12-04
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Granted: 1974-03-19
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Expires: 1992-12-04
Abstract
Abstract A system for applying groups of data bits to an electrostatic writing head having two staggered lines of electrodes in which odd bits of a group are serially fed directly to the electrodes of one line and in which even bits of a group are fed to the electrodes of the other line through a dynamic shift register having a number of places equal to n where n is the number of bits in a group and in which means is provided for recirculating the bits through the shift register in response to a wait signal.
Inventors
- 👤 H Frohbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:39
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
72 words
Printing apparatus including in combination a data source providing information in the form of data bit groups each representing a portion of a line to be printed, a printing head having two staggered rows of electrodes, means for applying alternate bits of each group to the electrodes of one row, and means including a dynamic shift register for applying the other bits of each group to the electrodes of the other row.
Claim 2
Dependent Claim
72 words
Printing apparatus including in combination a data source providing information in the form of data bit groups each representing a portion of a line to be printed, a printing head having two staggered rows of electrodes, means for applying alternate bits of each group to the electrodes of one row, and means including a dynamic shift register for applying the other bits of each group to the electrodes of the other row.
Claim 3
Dependent Claim
33 words
Apparatus as in claim 1 in which said register has a capacity equal to K times half the number of bits in a group, where K is an integer not less than two.
Claim 4
Dependent Claim
16 words
Apparatus as in claim 1 further including means for selectively recirculating the contents of said register.
Claim 5
Dependent Claim
22 words
Apparatus as in claim 1 further including means for selectively recirculating the entire contents of the register an integral number of times.
Claim 6
Dependent Claim
30 words
Apparatus as in claim 1 wherein the rows are spaced by two printing lines and wherein the register has a capacity equal to the number of bits in a group.
Claim 7
Dependent Claim
31 words
Apparatus as in claim 1 wherein the rows are spaced by three printing lines and wHerein the register has a capacity equal to three-halves the number of bits in a group.
Claim 8
Dependent Claim
30 words
Apparatus as in claim 1 wherein the data source provides information at a certain bit rate, the apparatus further including means for indexing the shift register at half said rate.
Claim 9
Dependent Claim
40 words
Apparatus as in claim 1 further including means for normally indexing the shift register at a predetermined rate and means for selectively indexing the shift register at K times said rate, where K is an integer not less than two.
Claim 10
Dependent Claim
19 words
Apparatus as in claim 8 wherein the rows are spaced by two printing lines and wherein K equals two.
Claim 11
Dependent Claim
19 words
Apparatus as in claim 8 wherein the rows are spaced by three printing lines and wherein K equals three.
Claim 12
Dependent Claim
80 words
Printing apparatus including in combination a data source providing data bits representing a portion of a line to be printed, a printing head having a row of electrodes, a dynamic shift register having a certain static storage time, means selectively coupling the source to the register, means selectively coupling the register to the electrodes, means selectively recirculating the contents of the register, and means continually indexing the shift register at rates greater than the reciprocal of its static storage time.
Claim 13
Dependent Claim
80 words
Printing apparatus including in combination a data source providing data bits representing a portion of a line to be printed, a printing head having a row of electrodes, a dynamic shift register having a certain static storage time, means selectively coupling the source to the register, means selectively coupling the register to the electrodes, means selectively recirculating the contents of the register, and means continually indexing the shift register at rates greater than the reciprocal of its static storage time.
Claim 14
Dependent Claim
41 words
Apparatus as in claim 11 wherein the data source includes means providing a signal of predetermined duration and wherein the recirculating means includes means responsive to said signal for recirculating the entire contents of the register an integral number of times.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |