Patent US3668982A successfully refreshed from Google Patents.
US3668982A
Expired / Lapsed
US
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Apparatus for folding the closing flap of envelopes
Assignee: Winkler and Duennebier Maschinefabrik und Eisengiesserei GmbH
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Filing: 1971-03-19
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Granted: 1972-06-13
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Expires: 1991-03-19
Abstract
Abstract A machine for making envelopes has an apparatus for folding the closing flap of envelopes which includes a rotary prefolding cylinder provided with fixed abutment edges and suction holes, a mating cylinder having a rotary folding strip, a stop abutment for the prefolded envelope, a finish folding cylinder having suction holes and moving in the opposite direction to the prefolding cylinder and a pressing segment cylinder associated with the finish folding cylinder.
Inventors
- 👤 Kurt Stemmler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:13
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/26; B31B70/56; B31B2150/00; B31B2160/00; B31B2160/10; B31B70/261
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
An apparatus for folding the closing flap of envelopes or the like, comprising a rotary prefolding cylinder having a plurality of abutment edges uniformly disposed on its circumference, suction holes associated with said abutment edges, prefolding edges and recesses adjoining said prefolding edges, a rotary mating cylinder having a folding strip adapted to engage any one of said recesses, said mating cylinder rotating at the same circumferential speed as said prefolding cylinder, a stop abutment located downstream of the prefolding cylinder and adapted to project into any one of said recesses, a finish folding cylinder located adjacent said prefolding cylinder and moving in an opposite direction thereto, said finish folding cylinder having a plurality of rows of suction holes, and a pressing segment cylinder located adjacent said finish folding cylinder and rotating at the same circumferential speed.
Claim 2
Independent Claim
137 words
An apparatus for folding the closing flap of envelopes or the like, comprising a rotary prefolding cylinder having a plurality of abutment edges uniformly disposed on its circumference, suction holes associated with said abutment edges, prefolding edges and recesses adjoining said prefolding edges, a rotary mating cylinder having a folding strip adapted to engage any one of said recesses, said mating cylinder rotating at the same circumferential speed as said prefolding cylinder, a stop abutment located downstream of the prefolding cylinder and adapted to project into any one of said recesses, a finish folding cylinder located adjacent said prefolding cylinder and moving in an opposite direction thereto, said finish folding cylinder having a plurality of rows of suction holes, and a pressing segment cylinder located adjacent said finish folding cylinder and rotating at the same circumferential speed.
Claim 3
Dependent Claim
26 words
An apparatus in accordance with claim 1, wherein said prefolding cylinder comprises prefolding segments adjacent said prefolding edges and stop abutment segments adjacent said abutment edges.
Claim 4
Dependent Claim
18 words
An apparatus in accordance with claim 2, wherein said prefolding cylinder comprises spider arms supporting said prefolding segments.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |