Patent US3693545A successfully refreshed from Google Patents.
US3693545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial type drums with apertures for changeable type segments
Assignee: Unisys Corp
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Filing: 1970-09-18
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Granted: 1972-09-26
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Expires: 1990-09-18
Abstract
Abstract A printing device for use in print type equipment is provided, having a shaft, a print type drum affixed to the shaft and an auxiliary type drum adjustably mounted on the shaft. The auxiliary drum is secured to the shaft in abutting relation to one end of the print drum when in its operating position. A plurality of type segments are carried by a like number of mounting apertures or slots in the periphery of the auxiliary drum and are slidably removable therefrom. The type segments are removable and insertable through peripheral access apertures provided in the abutting end of the print drum when the auxiliary drum is rotatably adjusted on the shaft to align the type segments with the access apertures, without the need to remove the drum or other parts of the assembly or perform an awkward time-consuming task to accomplish this purpose.
Inventors
- 👤 Nicholas Kondur Jr
- 👤 Ronald H Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:57
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/22; B41J1/32; G; G06; G06K; G06K15/00; G06K15/02; G06K15/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
231 words
A changeable print type device comprising: a shaft, a first print drum affixed to said shaft for rotation therewith for positioning peripherally mounted print type to a print line, said first print drum having an abutting end thereof substantially orthogonal to said shaft, said first print drum having at least one access aperture in the periphery thereof extending toward and intersecting said abuttable end, a second print drum sLidably mounted on said shaft coaxially with said first print drum, said second drum having one end substantially orthogonal to said shaft for laterally abutting with said abuttable end of said first print drum, said second print drum having at least one mounting slot in the periphery thereof extending in the direction and intersecting said one end, said mounting slot having an outermost portion extending the axial length of said second drum and an innermost portion having oppositely disposed grooves extending to a point intermediate the ends of said drum, and a removeable type segment having a top portion carrying a row of print type and a bottom flanged portion for slidable insertion into said mounting slot, said grooves locating the level of said print type in the plane of said print type of said first drum, said type segment slidably removeable into said access aperture when said mounting slot is aligned therewith by relative rotation of said first and second print drums.
Claim 2
Dependent Claim
231 words
A changeable print type device comprising: a shaft, a first print drum affixed to said shaft for rotation therewith for positioning peripherally mounted print type to a print line, said first print drum having an abutting end thereof substantially orthogonal to said shaft, said first print drum having at least one access aperture in the periphery thereof extending toward and intersecting said abuttable end, a second print drum sLidably mounted on said shaft coaxially with said first print drum, said second drum having one end substantially orthogonal to said shaft for laterally abutting with said abuttable end of said first print drum, said second print drum having at least one mounting slot in the periphery thereof extending in the direction and intersecting said one end, said mounting slot having an outermost portion extending the axial length of said second drum and an innermost portion having oppositely disposed grooves extending to a point intermediate the ends of said drum, and a removeable type segment having a top portion carrying a row of print type and a bottom flanged portion for slidable insertion into said mounting slot, said grooves locating the level of said print type in the plane of said print type of said first drum, said type segment slidably removeable into said access aperture when said mounting slot is aligned therewith by relative rotation of said first and second print drums.
Claim 3
Dependent Claim
49 words
A changeable print type device as defined by claim 1 wherein said first print drum further includes a plurality of radially spaced aligning notches in its peripheral surface extending toward and intersecting said abuttable end, said aligning notches having a predetermined shape and located in a predetermined position thereof.
Claim 4
Dependent Claim
58 words
A changeable print type device as defined by claim 2 wherein said type segment further includes a nose portion on said top portion extending from said one end of said nose portion having a shape for accurately nesting with said aligning notches for effectively joining said second print drum with said first print drum for joint rotation therewith.
Claim 5
Dependent Claim
65 words
A changeable print type device as defined in claim 1 wherein said second print drum additionally comprises a receptacle opposite its abuttable end, including a diametrically opposed opening extending from said receptacle through the periphery of said second drum, said receptacle receiving locking means internally of the second print drum for securing said second drum to the shaft against axial and rotatable movements relative thereto.
Claim 6
Dependent Claim
64 words
A changeable print type device as defined by claim 4 wherein said locking means is a collar, said shaft including a groove aligned with said collar, said collar having a fastening means for extending into said groove, said locking means and said aligning notches of said first print drum cooperating to prevent any angular or axial movement of the second print drum relative thereto.
Claim 7
Dependent Claim
32 words
A changeable print type device as defined by claim 5 wherein said collar additionally includes an elongated stem for counterbalancing said fastening means thereby preventing vibration of said second and first drums.
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |