Patent US3720565A successfully refreshed from Google Patents.
US3720565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for longitudinally welding tapes of plastics material - in packaging machines
Assignee: Individual
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Filing: 1970-06-29
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Granted: 1973-03-13
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Expires: 1990-06-29
Abstract
Abstract A device for longitudinally welding tapes of plastics material in packaging machines, which comprises, pulleys on a plate-like element which may be adjusted in level, at least some of said pulleys being driving pulleys and rotatably mounted with preferably vertical axis, on the said pulleys two pairs of endless belts being taken up, which have straight sections tangent between the said pulleys at the welding zone in order to clamp therebetween the edges of the tape of plastics material to be welded, the said belts being overlapped at a short distance from one another in number of two at each side with respect to the said welding zone, in such a manner as to define a narrow strip at which at least one nozzle is mounted to blow hot air.
Inventors
- 👤 M Cavanna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:57
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/87; B29C66/874; B29C66/8744; B29C66/87441; B29C65/00; B29C65/02; B29C65/10; B29C65/78; B29C65/7858; B29C65/7861; B29C65/787; B29C65/7873; B29C66/01; B29C66/05; B29C66/10; B29C66/13; B29C66/133; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/81; B29C66/816; B29C66/8161; B29C66/82; B29C66/822; B29C66/8221; B29C66/8226; B29C66/83; B29C66/834; B29C66/8341; B29C66/83421; B29C66/83423; B29C66/84; B29C66/841; B29C66/8412; B29C66/84123; B29C66/849; B29C66/872; B29C66/87443; B65; B65B; B65B51/00; B65B51/10; B65B51/20; B29C66/11; B29C66/112; B29C66/1122; B29C66/431; B29C66/4312; B29C66/43121; B29C66/43122; B29C66/7394; B29C66/73941; B29C66/90; B29C66/91; B29C66/92; B29C66/924; B29C66/9261; B29C66/92611
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
432 words
A device for welding the contacting longitudinal edges of thermoplastic film web previously bent into tubular form and continuously moving in a packaging machine on a conveyor belt comprising: a flat plate; an opening in said plate; height adjustment means mounted on said flat plate so that the height of said plate above said conveyor belt may be adjusted to a predetermined level; a first and a second slide mounted on said plate, each slide having two parallel guides, said guides being perpendicular to the direction of travel of said conveyor belt; a first and second pully each rotatably mounted on a first and second support respectively, said first and second supports being mounted on said first slide, said first and second pulleys forming a first pair of pulleys; a third and fourth pully each rotatably mounted on a third and fourth support respectively, said third and fourth supports being mounted on said second slide, said third and fourth pulleys forming a second pair of pulleys, each of said four pulleys having two axially spaced peripheral grooves and being mounted so that each pully is the same distance above said conveyor belt; at least one of said pairs of pulleys being driven; said first pair of pulleys being larger than said second pair of pulleys; a fifth and sixth pully rigidly mounted on said third and fouRth supports intermediate said first and second pairs of pulleys and mounted the same distance above said conveyor belt as said third and fourth pulleys, said fifth and sixth pulleys having two axially spaced grooves; two pairs of endless belts mounted on said pulleys in said grooves, said first pair of belts being mounted on said first, third and fifth pulleys and said second pair of belts being mounted on said second, fourth and sixth pulleys, said first and fifth pulleys and said second and sixth pulleys being positioned so that said two pairs of belts form a straight path of travel parallel to the direction of travel of said conveyor belt, said straight path of travel being across said opening; at least one nozzle mounted on said plate through said opening, said nozzle being positioned to blow hot air perpendicular to said pairs of belts and between each pair of belts; means for rigidly holding said second and fourth supports in position on said first and second slides respectively; and means for manually moving said first and third supports along said slides in a direction away from said second and fourth supports, said first and third supports being biased toward said second and fourth supports.
Claim 2
Independent Claim
432 words
A device for welding the contacting longitudinal edges of thermoplastic film web previously bent into tubular form and continuously moving in a packaging machine on a conveyor belt comprising: a flat plate; an opening in said plate; height adjustment means mounted on said flat plate so that the height of said plate above said conveyor belt may be adjusted to a predetermined level; a first and a second slide mounted on said plate, each slide having two parallel guides, said guides being perpendicular to the direction of travel of said conveyor belt; a first and second pully each rotatably mounted on a first and second support respectively, said first and second supports being mounted on said first slide, said first and second pulleys forming a first pair of pulleys; a third and fourth pully each rotatably mounted on a third and fourth support respectively, said third and fourth supports being mounted on said second slide, said third and fourth pulleys forming a second pair of pulleys, each of said four pulleys having two axially spaced peripheral grooves and being mounted so that each pully is the same distance above said conveyor belt; at least one of said pairs of pulleys being driven; said first pair of pulleys being larger than said second pair of pulleys; a fifth and sixth pully rigidly mounted on said third and fouRth supports intermediate said first and second pairs of pulleys and mounted the same distance above said conveyor belt as said third and fourth pulleys, said fifth and sixth pulleys having two axially spaced grooves; two pairs of endless belts mounted on said pulleys in said grooves, said first pair of belts being mounted on said first, third and fifth pulleys and said second pair of belts being mounted on said second, fourth and sixth pulleys, said first and fifth pulleys and said second and sixth pulleys being positioned so that said two pairs of belts form a straight path of travel parallel to the direction of travel of said conveyor belt, said straight path of travel being across said opening; at least one nozzle mounted on said plate through said opening, said nozzle being positioned to blow hot air perpendicular to said pairs of belts and between each pair of belts; means for rigidly holding said second and fourth supports in position on said first and second slides respectively; and means for manually moving said first and third supports along said slides in a direction away from said second and fourth supports, said first and third supports being biased toward said second and fourth supports.
Claim 3
Independent Claim
432 words
A device for welding the contacting longitudinal edges of thermoplastic film web previously bent into tubular form and continuously moving in a packaging machine on a conveyor belt comprising: a flat plate; an opening in said plate; height adjustment means mounted on said flat plate so that the height of said plate above said conveyor belt may be adjusted to a predetermined level; a first and a second slide mounted on said plate, each slide having two parallel guides, said guides being perpendicular to the direction of travel of said conveyor belt; a first and second pully each rotatably mounted on a first and second support respectively, said first and second supports being mounted on said first slide, said first and second pulleys forming a first pair of pulleys; a third and fourth pully each rotatably mounted on a third and fourth support respectively, said third and fourth supports being mounted on said second slide, said third and fourth pulleys forming a second pair of pulleys, each of said four pulleys having two axially spaced peripheral grooves and being mounted so that each pully is the same distance above said conveyor belt; at least one of said pairs of pulleys being driven; said first pair of pulleys being larger than said second pair of pulleys; a fifth and sixth pully rigidly mounted on said third and fouRth supports intermediate said first and second pairs of pulleys and mounted the same distance above said conveyor belt as said third and fourth pulleys, said fifth and sixth pulleys having two axially spaced grooves; two pairs of endless belts mounted on said pulleys in said grooves, said first pair of belts being mounted on said first, third and fifth pulleys and said second pair of belts being mounted on said second, fourth and sixth pulleys, said first and fifth pulleys and said second and sixth pulleys being positioned so that said two pairs of belts form a straight path of travel parallel to the direction of travel of said conveyor belt, said straight path of travel being across said opening; at least one nozzle mounted on said plate through said opening, said nozzle being positioned to blow hot air perpendicular to said pairs of belts and between each pair of belts; means for rigidly holding said second and fourth supports in position on said first and second slides respectively; and means for manually moving said first and third supports along said slides in a direction away from said second and fourth supports, said first and third supports being biased toward said second and fourth supports.
Claim 4
Independent Claim
432 words
A device for welding the contacting longitudinal edges of thermoplastic film web previously bent into tubular form and continuously moving in a packaging machine on a conveyor belt comprising: a flat plate; an opening in said plate; height adjustment means mounted on said flat plate so that the height of said plate above said conveyor belt may be adjusted to a predetermined level; a first and a second slide mounted on said plate, each slide having two parallel guides, said guides being perpendicular to the direction of travel of said conveyor belt; a first and second pully each rotatably mounted on a first and second support respectively, said first and second supports being mounted on said first slide, said first and second pulleys forming a first pair of pulleys; a third and fourth pully each rotatably mounted on a third and fourth support respectively, said third and fourth supports being mounted on said second slide, said third and fourth pulleys forming a second pair of pulleys, each of said four pulleys having two axially spaced peripheral grooves and being mounted so that each pully is the same distance above said conveyor belt; at least one of said pairs of pulleys being driven; said first pair of pulleys being larger than said second pair of pulleys; a fifth and sixth pully rigidly mounted on said third and fouRth supports intermediate said first and second pairs of pulleys and mounted the same distance above said conveyor belt as said third and fourth pulleys, said fifth and sixth pulleys having two axially spaced grooves; two pairs of endless belts mounted on said pulleys in said grooves, said first pair of belts being mounted on said first, third and fifth pulleys and said second pair of belts being mounted on said second, fourth and sixth pulleys, said first and fifth pulleys and said second and sixth pulleys being positioned so that said two pairs of belts form a straight path of travel parallel to the direction of travel of said conveyor belt, said straight path of travel being across said opening; at least one nozzle mounted on said plate through said opening, said nozzle being positioned to blow hot air perpendicular to said pairs of belts and between each pair of belts; means for rigidly holding said second and fourth supports in position on said first and second slides respectively; and means for manually moving said first and third supports along said slides in a direction away from said second and fourth supports, said first and third supports being biased toward said second and fourth supports.
Claim 5
Dependent Claim
142 words
A device as claimed in claim 1 wherein each of said manual moving means comprises: a rod connected, at one end thereof, to said support, said rod being parallel to said guides; a bracket on said plate, a clearance hole in said bracket in alignment with the longitudinal axis of said rod, the free end of said rod being slindingly inserted through said hole; a pivot on said free end of said rod, the axis of said pivot being perpendicular to the upper and lower surfaces of said plate; a cam member having a cam surface rotatively mounted on said pivot, said cam member being provided with a lever handle and the cam surface being in engagement with said bracket; and a spring biasing said support away from said bracket and biasing said cam surface of said cam member against said bracket.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |