US3924725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual array disc printer
Assignee: International Business Machines Corp
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Filing: 1974-06-28
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Granted: 1975-12-09
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Expires: 1994-06-28
Abstract
Abstract The gap usually required in the arrangement of type characters around the periphery of the print disc in a rotating disc printer to provide time for hammer settle-out is obviated by having two separate type arrays on the disc, one of primarily lower case characters followed by one of primarily upper case characters. To minimize reach the print hammer is movably supported so as to be shifted relative to the print position from a normal lower case position to a special upper case position so as to strike the type on the disc over two different ranges of positions - one range for lower case and a different range for upper case.
Inventors
- 👤 Robert F Kuhn
- 👤 Theodore F Lyons
- 👤 Jerry W Raider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:29
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/22; B41J1/24; B41J9/00; B41J9/02; B41J9/04; Y; Y10; Y10S; Y10S400/00; Y10S400/901
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
233 words
The combination in printing apparatus of a carrier having drive means operable to move said carrier past a plurality of print column positions along the print line of a document upon which a printing operation is to be performed, a rotating print wheel mounted on said carrier having an array of type characters of one group thereon around one portion of the periphery of the wheel and another array of type characters of a different group around another portion of the periphery of the print wheel, said print wheel having means to rotate said print wheel to present said type characters of both groups to each print column position, a print hammer carriEd by said carrier operable to impact said type characters and print in said print column positions on said document, and means to detect when the required printing changes from one selected print group to the other selected print group and to inhibit printing from two timewise adjacent groups, and means selectively operable to provide additional movement of said print hammer along said print line less than one of said print column positions in accordance with which group of type characters is positioned to print in a print column position so as to cause said hammer to be more nearly centered in the appropriate column position when said selected print group is in print column position in front of the hammer.
Claim 2
Dependent Claim
233 words
The combination in printing apparatus of a carrier having drive means operable to move said carrier past a plurality of print column positions along the print line of a document upon which a printing operation is to be performed, a rotating print wheel mounted on said carrier having an array of type characters of one group thereon around one portion of the periphery of the wheel and another array of type characters of a different group around another portion of the periphery of the print wheel, said print wheel having means to rotate said print wheel to present said type characters of both groups to each print column position, a print hammer carriEd by said carrier operable to impact said type characters and print in said print column positions on said document, and means to detect when the required printing changes from one selected print group to the other selected print group and to inhibit printing from two timewise adjacent groups, and means selectively operable to provide additional movement of said print hammer along said print line less than one of said print column positions in accordance with which group of type characters is positioned to print in a print column position so as to cause said hammer to be more nearly centered in the appropriate column position when said selected print group is in print column position in front of the hammer.
Claim 3
Dependent Claim
63 words
The invention as defined in claim 1 characterized by said carrier being movable along said print line and said means providing additional movement of said print hammer to cause said hammer to be more nearly centered in the appropriate column comprising means movably mounting said print hammer on said carrier for movement in a direction along said print line relative to said carrier.
Claim 4
Dependent Claim
35 words
The invention as defined in claim 1 characterized by said type characters of said one group comprising principally lower case type characters and said type characters of said different group comprising principally upper case characters.
Claim 5
Dependent Claim
51 words
The invention as defined by claim 1 characterized by said means providing additional movement of said print hammer further comprising a pair of leaf springs and electromagnetic shift means connecting said print hammer to said carrier for shifting said print hammer on said carrier in a direction along said print line.
Claim 6
Dependent Claim
90 words
The invention as defined in claim 1 characterized by said means providing additional movement of said print hammer including a character register containing a representation of a character to be printed, means including a logic circuit connected to said register to determine the group position on said print wheel of said character having a representation in said register, and shift control means connected to said array determining means and said print hammer shift means for selectively operating said hammer shift means in accordance with said group position of said character.
Claim 7
Dependent Claim
56 words
The invention as defined in claim 5 characterized by said carrier drive means including operating means connected to said shift control means to selectively connect and disconnect said carrier to and from said drive means when said shift control means operates to shift said print hammer from said another group position to said one group position.
Claim 8
Dependent Claim
41 words
The invention as defined in claim 1 characterized by said means providing additional movement of said print hammer including a rotatable threaded drive shaft and half nut means operable to selectively connect said carrier to be driven by said drive shaft.
Claim 9
Dependent Claim
51 words
The invention as defined in claim 7 characterized by said rotatable threaded drive shaft having threads with a predetermined pitch and said half nut means including a pair of half nuts positioned on said carrier to connect said carrier to said threaded drive shaft in other than an integral pitch relations.
Claim 10
Dependent Claim
37 words
The invention as defined in claim 8 characterized by logic circuit means for selectively effecting operation of said half nuts to position said carrier in different non-integral pitch relations comprising fractional pitch relations on said threaded shaft.
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |