US3716221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fusing device
Assignee: 3M Co
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Filing: 1971-01-04
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Granted: 1973-02-13
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Expires: 1991-01-04
Abstract
Abstract A fusing device for fusing thermoplastic resinous particulate material to a receptor sheet. The fusing device includes a fusing roller having a resilient fusing blanket supported on the periphery thereof and heating means to heat the fusing blanket to a temperature sufficient to fuse the particulate material. A backup roller is urged toward engagement with the deformable fusing blanket to press the receptor sheet carrying the particulate material into contact with the fusing roller. The fusing roller is coated with an off-set preventing liquid which is applied thereto from the backup roller at predetermined intervals during operation of the fusing device.
Inventors
- 👤 D Gorka
- 👤 H Laskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:16
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
216 words
A fusing device for fixing a thermoplastic developer powder onto a receptor sheet comprising: frame means, a fusing roller rotatably mounted in said frame means, said fusing roller comprising: a generally cylindrical hollow drum having an axially extending flat area running substantially the length thereof, a covering of a resilient material extending around the periphery of said drum, and heating means disposed within said drum for heating the exterior surface of said resilient material sufficiently to fuse a said developer powder to a said receptor sheet, a pair of members supported for pivotal movement relative to said frame on an axis parallel to that of said fusing roller, a hard surfaced backup roller journaled by said pivotal members, biasing means urging said backup roller toward said fusing roller for contact with said resilient covering on said fusing drum to provide rotation of said backup roller upon rotation of said fusing roller and to provide fusing pressure in the nip area between said rollers, means for limiting the interference between said fusing roller and said backup roller to prevent contact of said backup roller against said flat area of said fusing roller, means for applying a coating of an offset preventing liquid to the surface of said resilient material, and drive means for rotating said fusing roller.
Claim 2
Dependent Claim
216 words
A fusing device for fixing a thermoplastic developer powder onto a receptor sheet comprising: frame means, a fusing roller rotatably mounted in said frame means, said fusing roller comprising: a generally cylindrical hollow drum having an axially extending flat area running substantially the length thereof, a covering of a resilient material extending around the periphery of said drum, and heating means disposed within said drum for heating the exterior surface of said resilient material sufficiently to fuse a said developer powder to a said receptor sheet, a pair of members supported for pivotal movement relative to said frame on an axis parallel to that of said fusing roller, a hard surfaced backup roller journaled by said pivotal members, biasing means urging said backup roller toward said fusing roller for contact with said resilient covering on said fusing drum to provide rotation of said backup roller upon rotation of said fusing roller and to provide fusing pressure in the nip area between said rollers, means for limiting the interference between said fusing roller and said backup roller to prevent contact of said backup roller against said flat area of said fusing roller, means for applying a coating of an offset preventing liquid to the surface of said resilient material, and drive means for rotating said fusing roller.
Claim 3
Dependent Claim
70 words
A fusing device as recited in claim 1 wherein said means for applying a coating to said surface of said resilient material includes means for applying a coating of said offset preventing liquid to the periphery of said backup roller such that upon rotation of said backup roller and said fusing roller, without the presence of a receptor sheet, said liquid is applied to the surface of said fusing roller.
Claim 4
Dependent Claim
67 words
A fusing device as recited in claim 2 including cleaning means contacting the periphery of said backup roller disposed in circumferentially spaced relation about the periphery of said backup roller from said means for applying said offset preventing liquid and the nip area between said fusing and backup rollers for removing said offset preventing liquid and any debris carried thereby from the periphery of said backup roller.
Claim 5
Dependent Claim
95 words
A fusing device as recited in claim 2 including control means for energizing said drive means for said fusing roller upon advance of a receptor sheet having the thermoplastic resin thereon toward the nip between said fusing and backup rollers, said control means including means for affording rotation of said fusing roller and said backup roller without the presence of a receptor sheet after a predetermined number of rotations of each of said rollers such that said offset preventing liquid will be transferred from said backup roller to the covered surface of said fusing roller.
Claim 6
Dependent Claim
214 words
A fusing device for fixing a thermoplastic developer powder onto a receptor sheet comprising: frame means, a fusing roller rotatably mounted in said frame means, said fusing roller comprising: a generally cylindrical hollow drum, a covering of a resilient material extending around the periphery of said drum, and heating means disposed within said drum for heating the exterior surface of said resilient material sufficiently to fuse a said developEr powder to a said receptor sheet, a pair of members supported for pivotal movement relative to said frame on an axis parallel to that of said fusing roller, a hard surfaced backup roller journaled by said pivotal members, biasing means urging said backup roller toward said fusing roller for contact with said resilient covering on said fusing drum to provide rotation of said backup roller upon rotation of said fusing roller and to provide fusing pressure in the nip area between said rollers, means for applying a coating of an offset preventing liquid to the peripheral of said backup roller such that upon rotation of said backup roller and said fusing roller, without the presence of a receptor sheet, said liquid is transferred from the periphery of said backup roller to the surface of said fusing roller, and drive means for rotating said fusing roller.
Claim 7
Dependent Claim
214 words
A fusing device for fixing a thermoplastic developer powder onto a receptor sheet comprising: frame means, a fusing roller rotatably mounted in said frame means, said fusing roller comprising: a generally cylindrical hollow drum, a covering of a resilient material extending around the periphery of said drum, and heating means disposed within said drum for heating the exterior surface of said resilient material sufficiently to fuse a said developEr powder to a said receptor sheet, a pair of members supported for pivotal movement relative to said frame on an axis parallel to that of said fusing roller, a hard surfaced backup roller journaled by said pivotal members, biasing means urging said backup roller toward said fusing roller for contact with said resilient covering on said fusing drum to provide rotation of said backup roller upon rotation of said fusing roller and to provide fusing pressure in the nip area between said rollers, means for applying a coating of an offset preventing liquid to the peripheral of said backup roller such that upon rotation of said backup roller and said fusing roller, without the presence of a receptor sheet, said liquid is transferred from the periphery of said backup roller to the surface of said fusing roller, and drive means for rotating said fusing roller.
Claim 8
Dependent Claim
67 words
A fusing device as recited in claim 5 including cleaning means contacting the periphery of said backup roller disposed in circumferentially spaced relation about the periphery of said backup roller from said means for applying said offset preventing liquid and the nip area between said fusing and backup rollers for removing said offset preventing liquid and any debris carried thereby from the periphery of said backup roller.
Claim 9
Dependent Claim
95 words
A fusing device as recited in claim 5 including control means for energizing said drive means for said fusing roller upon advance of a receptor sheet having the thermoplastic resin thereon toward the nip between said fusing and backup rollers, said control means including means for affording rotation of said fusing roller and said backup roller without the presence of a receptor sheet after a predetermined number of rotations of each of said rollers such that said offset preventing liquid will be transferred from said backing roller to the covered surface of said fusing roller.
Claim 10
Dependent Claim
41 words
A fusing device as recited in claim 5 wherein said covering of a resilient material is bonded to a substrate sheet formed of a relatively rigid material to define a fusing blanket, which fusing blanket is removably secured to said drum.
Claim 11
Dependent Claim
16 words
A fusing device as recited in claim 8 wherein said resilient material comprises a silicone elastomer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |