Patent US3672265A successfully refreshed from Google Patents.
US3672265A
Expired / Lapsed
US
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Apparatus for stacking flattened bags of thermoplastic material which are made in a bag-making machine
Assignee: Windmoeller and Hoelscher KG
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Filing: 1971-03-02
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Granted: 1972-06-27
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Expires: 1991-03-02
Abstract
Abstract Stacking apparatus for flattened bags of thermoplastic material welded and severed from an intermittently fed two-ply web in a bag-making machine, which is comprised of a pair of conveyor chains carrying equally spaced bag-gripping bars disposed, when located in the conveying run of said chains, to be moved from a bag-receiving end of the apparatus substantially at the same level and in the same direction as the web is fed in the bagmaking machine. The gripping bars are arranged to enter the conveying run successively spaced from a welding tool of the machine equal to the length or width of the bags being made so that, when the web is stationary, its leading end can be engaged by one of the gripping bars. Means are provided for closing successive gripping bars to engage the bags severed from the web. Also, means are provided for intermittently advancing the conveyor chains in sequence with the operating cycle of the bagmaking machine by a distance equal to the spacing of the gripping bars along the chains. Then successive gripping bars are opened to release the bags. A stacking conveyor is disposed beneath the conveying run of the chains and receives successive bags in a superposed fashion when released by the successive gripping bars. The superposed bags are carried away by the stacking conveyor when a predetermined number of bags has been superposed to form a stack.
Inventors
- 👤 August Schwarzkopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:12
CPC Classifications
B; B65; B65H; B65H29/00; B65H29/02; B65H29/04; B65H29/041; B65H2701/00; B65H2701/10; B65H2701/19; B65H2701/191
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
227 words
Stacking apparatus for flattened bags of thermoplastic material welded and severed from an intermittently fed two-ply web in a bag-making machine, comprising a pair of conveyor chains carrying equally spaced bag-gripping bars disposed, when located in the conveying run of said chains, so as to be moved from a bag-receiving end of the apparatus substantially at the same level and in the same direction as the web is fed in the baGmaking machine, the gripping bars being arranged to enter said conveying run successively at a spacing from a welding tool of the machine equal to the length or width of the bags being made so that, when the web is stationary, its leading end can be engaged by one of the gripping bars, means for closing successive gripping bars to engage the bags severed from the web, means for intermittently advancing the conveyor chains in sequence with the operating cycle of the bag-making machine by a distance equal to the spacing of the gripping bars along the chains, means for opening successive gripping bars to release the bags, and a stacking conveyor disposed beneath the conveying run of the chains, successive bags being superposed on the the stacking conveyor when released by successive gripping bars and being carried away by the stacking conveyor when a predetermined number of bags has been superposed to form a stack.
Claim 2
Dependent Claim
227 words
Stacking apparatus for flattened bags of thermoplastic material welded and severed from an intermittently fed two-ply web in a bag-making machine, comprising a pair of conveyor chains carrying equally spaced bag-gripping bars disposed, when located in the conveying run of said chains, so as to be moved from a bag-receiving end of the apparatus substantially at the same level and in the same direction as the web is fed in the baGmaking machine, the gripping bars being arranged to enter said conveying run successively at a spacing from a welding tool of the machine equal to the length or width of the bags being made so that, when the web is stationary, its leading end can be engaged by one of the gripping bars, means for closing successive gripping bars to engage the bags severed from the web, means for intermittently advancing the conveyor chains in sequence with the operating cycle of the bag-making machine by a distance equal to the spacing of the gripping bars along the chains, means for opening successive gripping bars to release the bags, and a stacking conveyor disposed beneath the conveying run of the chains, successive bags being superposed on the the stacking conveyor when released by successive gripping bars and being carried away by the stacking conveyor when a predetermined number of bags has been superposed to form a stack.
Claim 3
Dependent Claim
50 words
Apparatus according to claim 1 including a second, independently operable stacking conveyor and second, independently operable means for opening successive gripping bars to release the bags when disposed above the second stacking conveyor, whereby successive stacks can be formed on alternate stacking conveyors depending on which opening means are operated.
Claim 4
Dependent Claim
45 words
Apparatus according to claim 2, wherein the opening means are reciprocatable by respective lifting motors actuated by a bag counter which comprises sensing means for counting, at the bag-receiving end of the apparatus, the predetermined number of bags to be superposed on each stacking conveyor.
Claim 5
Dependent Claim
91 words
Apparatus according to claim 1, wherein the said intermittent advancing means for the conveyor chains comprise an electromagnetic clutch combined with a slowing-down brake, a first switch actuated in sequence with the operating cycle of the bag-making machine for engaging the clutch at the instant when the welding tool has completed welding of the web in the bag-making machine, and a second switch for disengaging the clutch, the second switch being actuated by cams which are carried by the conveyor chains at intervals equal to the spacing of the gripping bars.
Claim 6
Dependent Claim
103 words
Apparatus according to claim 1 in combination with a bag-making machine in which the web is intermittently fed by a mechanical rotary stepping device, wherein the said intermittent advancing means for the conveyor chains comprise a second similar rotary stepping device which turns in synchronism with the stepping device for the web feed but precedes it by a predetermined angle which is such that the conveyor chains begin to advance while the web is at a standstill at the instant when the welding tool has completed welding of the web and a bag has been severed from the leading end of the web.
Claim 7
Dependent Claim
65 words
Apparatus according to claim 1, wherein each gripping bar comprises a plurality of gripping fingers which co-operate with a belt conveyor to engage a severed bag, the belt conveyor being disposed above the conveying run of the conveyor chains and being moved in synchronism therewith, and wherein the pair of conveyor chains extends in a loop within which the or each stacking conveyor is arranged.
Claim 8
Dependent Claim
33 words
Apparatus according to claim 1, including a conveyor supporting frame which is displaceably mounted on a stationary base for adjusting the spacing of the bag-receiving end of the apparatus from the bag-making machine.
References Cited (Backward Citations)
US2258880A
Cited
US3323425A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |