Patent US4408974A successfully refreshed from Google Patents.
US4408974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile film stretching unit
Assignee: Comerio Ercole SpA
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Filing: 1982-01-20
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Granted: 1983-10-11
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Expires: 2002-01-20
Abstract
Abstract A film stretching unit movably positioned adjacent to an existing calender installation is described which includes a plurality of strecthing rollers having internal rotary joints for circulating a heating fluid therethrough. Alternate rollers are movable vertically without needing to change their rotational speed in order to easily thread the film through the stretching rollers.
Inventors
- 👤 Rinaldo I. Comerio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:28
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; B29C33/00; B29C33/02; B29C33/04; B29C33/044; B29C55/00; B29C55/02; B29C55/04; B29C55/06; B29C55/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
61 words
In a take-off unit positionable adjacent to the final calender roll of a calender installation for processing plastic film and including a bed of stretching rollers for applying stretching forces to said plastic film, the improvement comprising means connected to alternate rollers of said bed of rollers for moving said alternate rollers vertically in unison while continuously rotating the moving rollers.
Claim 2
Dependent Claim
61 words
In a take-off unit positionable adjacent to the final calender roll of a calender installation for processing plastic film and including a bed of stretching rollers for applying stretching forces to said plastic film, the improvement comprising means connected to alternate rollers of said bed of rollers for moving said alternate rollers vertically in unison while continuously rotating the moving rollers.
Claim 3
Dependent Claim
108 words
A unit according to claim 1, wherein said means includes respective gear housings connected to one end of each said alternate roller and coupling a respective vertical drive shaft thereto, said drive shafts each slidably receiving a driving shaft adapted to be driven by a suitable power source and connected for rotation with the respective drive shaft, bearing housings connected to the other end of each said alternate roller, and lift means for moving said gear housing and said bearing housing vertically in unison with said drive shafts continuing to rotate said driving shafts and thereby said alternate rollers as said driving shafts slide over said drive shafts.
Claim 4
Dependent Claim
53 words
A unit according to claim 2, wherein said lift means include a quadrilateral frame member lying below said bed of rollers, a respective shaft member connecting each said housing to said frame member, a plurality of jacks connected to corner portions of said frame member, and means for actuating said jacks in unison.
Claim 5
Dependent Claim
29 words
A unit according to claim 3, wherein said jacks each comprise a respective threaded member rotated in unison to raise or lower said frame member by a single motor.
Claim 6
Dependent Claim
31 words
A unit according to claim 4, wherein said threaded member is engaged by a driving member adapted to hold said threaded member in its rotational position upon de-activation of said motor.
Claim 7
Dependent Claim
12 words
A unit according to claim 4, wherein said means are activated pneumatically.
Claim 8
Dependent Claim
22 words
A unit according to claim 6, including means for automatically activating said motor to raise said alternate rollers upon an electrical failure.
Claim 9
Dependent Claim
25 words
A unit according to claim 1, wherein said means are adapted to hold said alternate rollers in any position along their path of vertical movement.
Claim 10
Dependent Claim
30 words
A unit according to claim 1, further including an embossing roller located downstream of said bed of stretching rollers and a back-up roller forming a nip with said embossing roller.
Claim 11
Dependent Claim
23 words
A unit according to claim 9, wherein said back-up roller is contacted by at least one doctor roll having a cooling medium therein.
Claim 12
Dependent Claim
44 words
A unit according to claim 1, wherein said stretching rollers are connected to a source of heating fluid through rotary joints positioned internally within the respective rollers whereby said rollers can have a width approaching that of the final calender roll of said installation.
Claim 13
Dependent Claim
19 words
A unit according to any of claims 1, 9, or 11, further including a mobile carriage supporting said unit.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |