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US3602138A
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US
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Hammer driver timing from a print buffer ring
Assignee: International Business Machines Corp
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Filing: 1969-12-30
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Granted: 1971-08-31
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Expires: 1989-12-30
Abstract
Abstract There is disclosed timing logic which is useful in high speed chain printer apparatus. The function of the logic is to time the print hammers accurately to any pulse duration that is needed regardless of the print scan timing. In the version specifically described, the logic times the hammer pulse to 2.5 print scans by modifying the hammer address by one-half of a print scan.
Inventors
- 👤 James G Barcomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:45
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
In a printer having a plurality of pring hammers with firing means and a chain bearing a plurality of characters movable past said hammers, core storage means for storing data to be printed in each of a plurality of positions corresponding to said hammers, means for determining the character at a particular hammer position means for comparing the character in core storage for the particular hammer position and generating a print compare signal, the improvement of hammer timing logic comprising: a. a plurality of additional core planes having row and column arrangements corresponding with the arrangement in the core storage and addressed simultaneously therewith, b. address modification means responsive to said print compare signal for changing the address of the currently addressed hammer and recording an indication of said print compare signal in the first of said plurality of additional core planes, c. means responsive to the readout from said plurality of additional core planes for advancing the data stored therein in a binary progression during each print scan, and d. means responsive to a predetermined count read out from said plurality of additional core planes for generating a reset pulse to the print hammer.
Claim 2
Dependent Claim
195 words
In a printer having a plurality of pring hammers with firing means and a chain bearing a plurality of characters movable past said hammers, core storage means for storing data to be printed in each of a plurality of positions corresponding to said hammers, means for determining the character at a particular hammer position means for comparing the character in core storage for the particular hammer position and generating a print compare signal, the improvement of hammer timing logic comprising: a. a plurality of additional core planes having row and column arrangements corresponding with the arrangement in the core storage and addressed simultaneously therewith, b. address modification means responsive to said print compare signal for changing the address of the currently addressed hammer and recording an indication of said print compare signal in the first of said plurality of additional core planes, c. means responsive to the readout from said plurality of additional core planes for advancing the data stored therein in a binary progression during each print scan, and d. means responsive to a predetermined count read out from said plurality of additional core planes for generating a reset pulse to the print hammer.
Claim 3
Dependent Claim
40 words
The hammer timing logic as recited in claim 1 wherein said plurality of additional core planes comprise two core planes and said reset pulse generating means is responsive to a binary count of 1, 1 for generating said reset pulse.
Claim 4
Dependent Claim
24 words
The hammer timing logic as recited in claim 2 wherein said address modification means modifies the hammer address by one-half of a print scan.
Claim 5
Dependent Claim
178 words
The hammer timing logic of claim 1 wherein each print scan consists of a plurality of clock cycles, each clock cycle consisting of a sequence of pulses defining a plurality of read and write subcycles, a first group of said subcycles being termed a MAJOR cycle and a second group of said subcycles being termed a MINOR cycle, said MINOR cycle occurring at the latter portion of each of said clock cycles and comprising a plurality of write subcycles, said address modification means including: a. address counter means for selectively designating an address corresponding to a location in said core planes, b. read/write control means responsive to said clock subcycles for addressing a location in said core planes designated by said counter means during a MAJOR cycle, and c. logic means responsive to the MINOR cycle for altering the location addressed by said read/write control means during the MINOR cycle. whereby two locations in said core planes are addressed during each clock cycle, said two locations being subjected successively to a write operation without an intervening read operation.
Claim 6
Dependent Claim
36 words
The hammer timIng logic as recited in claim 1 wherein said address modifications means includes means for providing two successive write cycles for changing the address of the currently addressed hammer without an intervening read cycle.
References Cited (Backward Citations)
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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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |