US3654841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine for making plastic bags
Assignee: Paramount Packaging Corp
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Filing: 1970-10-20
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Granted: 1972-04-11
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Expires: 1990-10-20
Abstract
Abstract A machine for making open-gusset bags from thermoplastic material is disclosed. Reciprocating blades are disposed within the gusset to open the gusset after a generally V-shaped notch is removed from the gusset and before the web is divided into bags by transverse welds.
Inventors
- 👤 Francis A Davis Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:14
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/14; B31B70/16; B31B2155/00; B31B2160/00; B31B2160/10; B31B2160/20; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1054; Y10T156/19; Y10T156/195; Y10T156/1956
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A machine for making bags from thermoplastic material comprising means for intermittently feeding a web having a top and bottom layer connected along a longitudinal side edge by a gusset, a notch cutter-welder means for cutting a V-shaped notch in the gusset while the web is stationary and simultaneously welding a seam adjacent and parallel but spaced from the notch, said seam weld joining the top tow layers of the gusset together and also joining the bottom two layers of the gusset together, said cutter-welder means including a top platen mounted for movement toward and away froM a bottom platen, at least one pressure plate supported by the bottom platen and spring-biased toward the top platen for cooperation therewith in embracing the web therebetween, and means downstream from said cutter-welder means for transversely cutting the stationary web at the apex of the notch to form individual bags and simultaneously seam weld the cut edge adjacent but spaced from the cut edge.
Claim 2
Dependent Claim
161 words
A machine for making bags from thermoplastic material comprising means for intermittently feeding a web having a top and bottom layer connected along a longitudinal side edge by a gusset, a notch cutter-welder means for cutting a V-shaped notch in the gusset while the web is stationary and simultaneously welding a seam adjacent and parallel but spaced from the notch, said seam weld joining the top tow layers of the gusset together and also joining the bottom two layers of the gusset together, said cutter-welder means including a top platen mounted for movement toward and away froM a bottom platen, at least one pressure plate supported by the bottom platen and spring-biased toward the top platen for cooperation therewith in embracing the web therebetween, and means downstream from said cutter-welder means for transversely cutting the stationary web at the apex of the notch to form individual bags and simultaneously seam weld the cut edge adjacent but spaced from the cut edge.
Claim 3
Dependent Claim
64 words
A machine in accordance with claim 1 including a separator means having a pair of blades disposed in the gusset between the middle layers of the gusset, and actuator means for selectively moving the blades along the gusset toward and away from each other after the V-shaped notch has been cut and the edges of the notch have been provided with said seam weld.
Claim 4
Dependent Claim
55 words
A machine in accordance with claim 2 wherein said means for selectively moving the blades is coupled to said top platen so that downward movement of the top platen results in movement of the plates away from each other, and a lost motion connection between said top platen and the means for moving the blades.
Claim 5
Dependent Claim
27 words
A machine in accordance with claim 1 including means mounting said notch-cutter-welder means for horizontal movement toward and away from said means for transversely cutting the web.
Claim 6
Dependent Claim
88 words
The machine in accordance with claim 1 wherein said cutter-welder means includes a V-shaped cutting blade mounted on the bottom platen, said bottom platen being stationary, said pressure plate being on one side of the blade, a second pressure plate on the other side of the blade, said second pressure plate being spring-biased toward the top platen for cooperation with the top platen in embracing the web therebetween, said first and second pressure plates being independently spring-biased so that they may accommodate the different thicknesses of the web.
Claim 7
Dependent Claim
73 words
A machine in accordance with claim 1 wherein said cutter-welder means includes a die head, said top platen being adjustably supported by said die head and spring-biased downwardly towards the bottom platen, said top platen having a heated V-shaped welding surface and a cooled V-shaped member adjacent to the surface, but spaced therefrom by a gap into which a cutting blade on the bottom platen extends in the closed disposition of the platens.
Claim 8
Dependent Claim
126 words
A notch-cutter-welder for use in a machine for making bags from thermoplastic material comprising means for cutting a V-shaped notch at a fold line in a web while the web is stationary and simultaneously welding a seam adjacent and parallel but spaced from the notch so as to join two layers of the web together, including a top platen mounted for movement toward and away from the bottom platen, at least one pressure plate supported by the bottom platen and spring-biased toward the top platen for cooperation therewith in embracing the web therebetween, and said means including a V-shaped cutting blade on one of said platens and the other platen having a V-shaped gap into which the blade extends in a closed disposition of the platens.
Claim 9
Dependent Claim
126 words
A notch-cutter-welder for use in a machine for making bags from thermoplastic material comprising means for cutting a V-shaped notch at a fold line in a web while the web is stationary and simultaneously welding a seam adjacent and parallel but spaced from the notch so as to join two layers of the web together, including a top platen mounted for movement toward and away from the bottom platen, at least one pressure plate supported by the bottom platen and spring-biased toward the top platen for cooperation therewith in embracing the web therebetween, and said means including a V-shaped cutting blade on one of said platens and the other platen having a V-shaped gap into which the blade extends in a closed disposition of the platens.
Claim 10
Dependent Claim
70 words
A welder in accordance with claim 7 including a separator means having a pair of blades to be disposed in a gusset at said fold line between the middle layers of the gusset, and actuator means for selectively moving the blades along the gusset toward and away from each other after the V-shaped notch has been cut and the edges of the notch have been provided with said seam weld.
Claim 11
Dependent Claim
30 words
A welder in accordance with claim 8 including spring means biasing the blades toward each other, and means coupling said actuator means to motor means for moving the top platen.
Claim 12
Dependent Claim
42 words
A welder in accordance with claim 7 wherein said blade is between said pressure plate and a second pressure plate disposed at substantially the same elevation as said first-mentioned pressure plate, and means associated with each pressure plate for cooling the same.
References Cited (Backward Citations)
US3470795A
Cited
US3534666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |