US3722376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag machine
Assignee: FMC Corp
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Filing: 1971-09-01
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Granted: 1973-03-27
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Expires: 1991-09-01
Abstract
Abstract The bag machine of the present disclosure is of the type which can produce bags made of various thermoplastic sheet material and can be adapted to make side weld or bottom weld bags. The following description will, however, be confined to the production of side weld bags. A roll of plastic web is mounted on an unwind stand and traverses a folding board constraining the web to fold along its longitudinal median or along a line spaced from and parallel to the longitudinal median in the event it is desired to produce wicketed bags having a lip with a pair of holes in which is inserted a U-shape wire called a wicket. Downstream of the folding board a gusseter is provided to produce a fold which permits greater expansion at the bottom of the bag. The folded and gusseted web thence comes under the influence of a reciprocating transversely disposed seal and cutter bar which divides the web, at longitudinally spaced intervals, to produce individual bags. The bags are then transported to a table which is provided with devices for arranging the bags into a stack.
Inventors
- 👤 R Wech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:42
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/60; B31B70/64; B31B2155/00; B31B2160/00; B31B2160/10; B31B2160/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
163 words
In a bag machine of the type for making bottom or side weld bags of thermoplastic web material, said machine having a drive train operable to intermittently feed the web which is transversely severed and sealed during its period of repose thereby producing an individual bag, the bag so produced being transported by conveyors, running faster than the average speed of the web, to effect separation of the bags, the discharge end of said conveyor being associated with a bag decelerating device operable to momentarily grip the trailing end of the bag before it is received on a stacking table, the improvement in said bag transporting conveyor comprising a variable speed drive for said transport conveyor, means for adjusting said drive independently of the drive train of the bag machine for controlling the speed at which the bags are transported by said conveyor, said drive being adjusted so that the trailing edges of the bags is momentarily engaged by the bag decelerating device.
Claim 2
Dependent Claim
163 words
In a bag machine of the type for making bottom or side weld bags of thermoplastic web material, said machine having a drive train operable to intermittently feed the web which is transversely severed and sealed during its period of repose thereby producing an individual bag, the bag so produced being transported by conveyors, running faster than the average speed of the web, to effect separation of the bags, the discharge end of said conveyor being associated with a bag decelerating device operable to momentarily grip the trailing end of the bag before it is received on a stacking table, the improvement in said bag transporting conveyor comprising a variable speed drive for said transport conveyor, means for adjusting said drive independently of the drive train of the bag machine for controlling the speed at which the bags are transported by said conveyor, said drive being adjusted so that the trailing edges of the bags is momentarily engaged by the bag decelerating device.
Claim 3
Dependent Claim
19 words
The apparatus according to claim 1 wherein said variable speed device comprises independently operable nominal and fine adjusting means.
Claim 4
Dependent Claim
47 words
The apparatus according to claim 1 wherein said means for driving the bag transporting conveyor is an electric motor whose speed is infinitely adjustable to synchronize the speed of said conveyor with the bag decelerating device so that the trailing end of the bag is momentarily engaged.
Claim 5
Dependent Claim
32 words
The apparatus according to claim 3 wherein said electric motor is of the direct current type which is electrically connected to potentiometers adjustable to produce nominal and fine adjustments of said motor.
Claim 6
Independent Claim
106 words
An apparatus for synchronizing the speed of a bag machine belt conveyor with the operation of a bag slow down device which makes momentary contact with bags before being discharged to a stacking table, said apparatus comprising a direct current motor for driving the belt conveyor, means for preliminarily adjusting the speed of said motor to deliver the bags to the slow down so that contact with the bag is made at or near its trailing edge, and means for finally adjusting the speed of said motor so that bags transported by the belt conveyor are engaged at their trailing edge by said slow down device.
Claim 7
Independent Claim
106 words
An apparatus for synchronizing the speed of a bag machine belt conveyor with the operation of a bag slow down device which makes momentary contact with bags before being discharged to a stacking table, said apparatus comprising a direct current motor for driving the belt conveyor, means for preliminarily adjusting the speed of said motor to deliver the bags to the slow down so that contact with the bag is made at or near its trailing edge, and means for finally adjusting the speed of said motor so that bags transported by the belt conveyor are engaged at their trailing edge by said slow down device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |