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US3643555A Expired / Lapsed US ⏱️ 0.0 years remaining

Flap folding apparatus for envelope making machines

Assignee: Winkler and Duennebier Maschinefabrik und Eisengiesserei GmbH
•
Filing: 1970-09-23
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Granted: 1972-02-22
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Expires: 1990-09-23
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Abstract

Abstract Machine for producing envelopes has a flap folding apparatus whereby the flap of an envelope is optionally folded against its rear side, or after being previously folded is opened once again, or is folded against the front side of the envelope. The apparatus has a first suction cylinder and delivery discs. The invention is particularly characterized in that between the first suction cylinder and the delivery discs there are provided a second and third suction cylinder preceded by an adjustable stop abutment and a flap opener and associated with a folding pocket and a folding cylinder. The apparatus has three operational possibilities. According to the first one, each envelope with a closed flap is conveyed by the suction cylinders into a slot of the delivery discs. According to the second operation each envelope is conveyed by the first suction cylinder to a stop abutment, then is gripped by the third suction cylinder and is conveyed in the opposite direction to a flap opener, so that the envelope with an open flap is conveyed into the slot of the delivery discs. According to the third operation each envelope which is provided with a precreased folding edge and a flap is transferred by the first and second suction cylinders into a folding pocket and then is conveyed by the third suction cylinder under a folding cylinder and into a slot of the delivery discs.

Inventors

  • 👤 Guenter Ehlscheid

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 01:19
CPC Classifications
B; B65; B65H; B65H45/00; B65H45/12; B65H45/28; B65H45/02; B65H45/04; B31; B31B; B31B2150/00; B31B2160/00; B31B2160/10; B31B70/00; B31B70/26; B31B70/261

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 199 words
A flap folding apparatus for an envelopemaking machine, said apparatus comprising a first suction cylinder receiving the made envelopes, a second suction cylinder, a third suction cylinder, said second and third suction cylinders being located adjacent said first suction cylinder and being adapted to receive envelopes from said first suction cylinder, an adjustable stop abutment adjacent said first suction cylinder, a flap opener adjacent said first and third suction cylinders, a folding pocket adjacent said second and third suction cylinders, delivery discs adjacent said third suction cylinder, and means actuating said suction cylinders for transmitting an envelope the flap of which remains closed consecutively by first, second and third suction cylinders to the delivery discs, for transmitting an envelope the flap of which is to be opened from said first suction cylinder to said stop abutment, thence in a reverse direction by said third suction cylinder to said flap opener and thence to said delivery discs, and for transmitting an envelope the flap of which is to be folded against the front side from said first suction cylinder to said second suction cylinder, thence to said folding pocket and thence by said third suction cylinder to said delivery discs.
Claim 2
Dependent Claim 199 words
A flap folding apparatus for an envelopemaking machine, said apparatus comprising a first suction cylinder receiving the made envelopes, a second suction cylinder, a third suction cylinder, said second and third suction cylinders being located adjacent said first suction cylinder and being adapted to receive envelopes from said first suction cylinder, an adjustable stop abutment adjacent said first suction cylinder, a flap opener adjacent said first and third suction cylinders, a folding pocket adjacent said second and third suction cylinders, delivery discs adjacent said third suction cylinder, and means actuating said suction cylinders for transmitting an envelope the flap of which remains closed consecutively by first, second and third suction cylinders to the delivery discs, for transmitting an envelope the flap of which is to be opened from said first suction cylinder to said stop abutment, thence in a reverse direction by said third suction cylinder to said flap opener and thence to said delivery discs, and for transmitting an envelope the flap of which is to be folded against the front side from said first suction cylinder to said second suction cylinder, thence to said folding pocket and thence by said third suction cylinder to said delivery discs.
Claim 3
Dependent Claim 56 words
An apparatus according to claim 1, wherein said first suction cylinder comprises a rotary middle part having a row of suction apertures and two side parts concentrical to said middle part and located adjacent to said middle part on opposite sides thereof, said side parts rotating in a direction opposite to that of said middle part.
Claim 4
Dependent Claim 16 words
An apparatus according to claim 1, comprising slip-preventing friction members carried by said third suction cylinder.

References Cited (Backward Citations)

US3116668A Cited
US3537362A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-02-21 1975-08-23 1976-02-22 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-02-21 1979-08-23 1980-02-22 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-02-21 1983-08-23 1984-02-22 $7700.00 Window Closed / Lapsed

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