Patent US3893884A successfully refreshed from Google Patents.
US3893884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag-making machine
Assignee: Ateliers de Constructions Mecaniques C&A Holweg SA
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Filing: 1972-09-20
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Granted: 1975-07-08
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Expires: 1992-09-20
Abstract
Abstract The disclosure is of improvements in a bag-making machine characterised in that for the manufacture of bags of great length, the bag lengths are folded before welding of the bag bottom, and in that the device for cooling the weld is constituted by a plurality of bars presented in the form of a belt which during a certain time accompanies the accumulating drum and therefore the bags.
Inventors
- 👤 Jean Class
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:37
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/74; B31B70/76; B31B2155/00; B31B2155/003; B31B2160/00; B31B2160/10; Y; Y10; Y10T; Y10T156/00; Y10T156/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
IN A MACHINE FOR THE MANUFACTURE OF BAGS FROM THERMOPLASTIC MATERIAL, COMPRISING MEANS FOR ADVANCING A CONTINUOUS TUBE OF THERMOPLASTIX MATERIAL, MEANS FOR SEVERING LENGTHS FROM SAID TUBE, A WELDING DRUM ON WHICH ONE END OF EACH SAID LENGTH IS HEAT-SEALED CLOSED ALONG A TRANSVERSE WELD LINE, AND A FURTHER DRUM ABOUT WHICH SAID LENGTHS PASS AFTER LEAVING SAID WELDING DRUM, THE IMPROVEMENT COMPRISING MEANS DISPOSED BETWEEN SAUD SEVERING MEANS AND SAID WELDING DRUM FOR FOLDING SAID LENGTHS ABOUT AT LEAST ONE TRANSVERSE FOLD LINE, AND AN ENDLESS BELT THAT COACTS WITH SAID FURTHER DRUM SO THAT SAID LENGTHS PASS BETWEEN SAID BELT AND SAID FURTHER DRUM, SAID BELT HAVING THEREON A PLURALITY OF SPACED BARS THAT CONTACT THE HEAT-SEALED ENDS OF SAID LENGTHS ALONG SAID TRANSVERSE WELD LINE, AND MEANS TO COOL SAID BARS.
Claim 2
Dependent Claim
135 words
IN A MACHINE FOR THE MANUFACTURE OF BAGS FROM THERMOPLASTIC MATERIAL, COMPRISING MEANS FOR ADVANCING A CONTINUOUS TUBE OF THERMOPLASTIX MATERIAL, MEANS FOR SEVERING LENGTHS FROM SAID TUBE, A WELDING DRUM ON WHICH ONE END OF EACH SAID LENGTH IS HEAT-SEALED CLOSED ALONG A TRANSVERSE WELD LINE, AND A FURTHER DRUM ABOUT WHICH SAID LENGTHS PASS AFTER LEAVING SAID WELDING DRUM, THE IMPROVEMENT COMPRISING MEANS DISPOSED BETWEEN SAUD SEVERING MEANS AND SAID WELDING DRUM FOR FOLDING SAID LENGTHS ABOUT AT LEAST ONE TRANSVERSE FOLD LINE, AND AN ENDLESS BELT THAT COACTS WITH SAID FURTHER DRUM SO THAT SAID LENGTHS PASS BETWEEN SAID BELT AND SAID FURTHER DRUM, SAID BELT HAVING THEREON A PLURALITY OF SPACED BARS THAT CONTACT THE HEAT-SEALED ENDS OF SAID LENGTHS ALONG SAID TRANSVERSE WELD LINE, AND MEANS TO COOL SAID BARS.
Claim 3
Dependent Claim
77 words
A machine as claimed in claim 1, said folding means comprising a folding blade for forming a transverse fold in said lengths between the forward and rear ends of said lengths with respect to the direction of movement of said lengths by said advancing means, and suction means for retarding the forward end of the lengths thereby to fold said forward end back on said rearward end upon continued movement of said lengths by said advancing means.
Claim 4
Dependent Claim
52 words
A machine as claimed in claim 2, said folding means comprising a pair of drums between which said lengths pass, one of said drums carrying said folding blade and said suction means and the other of said drums carrying movable gripper means that releasably grasp the fold formed by said folding blade.
Claim 5
Dependent Claim
30 words
A machine as claimed in claim 1, and material on said bars for retaining a cooling liquid, and means to apply a cooling liquid to said material on said bars.
Claim 6
Dependent Claim
21 words
A machine as claimed in claim 4, said liquid-applying means comprising a vessel with cooling liquid with fountain roller means therein.
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |