US3868892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing bags with an inner bag which has a Z-fold
Assignee: Windmoeller and Hoelscher KG
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Filing: 1973-09-06
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Granted: 1975-03-04
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Expires: 1993-09-06
Abstract
Abstract The invention relates to a method for manufacturing bags having a single layer or multi-layer outer bag, preferably made of paper, and an inner bag preferably made from a web of synthetic plastics material. The inner bag has a Z-fold formed therein, and this is opened out when the bag is in use. In the method of the invention, a transverse weld seam is formed in the tubular material for the inner bag before the Z-fold is formed so that the base of the inner bag can be hermetically sealed. The tubular material for the inner bag is conveyed out of a substantially horizontal conveying direction into a slightly rising conveying direction and this makes it possible to form a loop of material, which is required for forming the Z-folds. The direction of travel of the tubular material for the insert bag is then reversed and this enables the part of the Z-fold which points in the direction of travel to lie on the side of the tubular material which is against the web for the outer bag.
Inventors
- 👤 Aloys Winnemoller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:06
CPC Classifications
B; B31; B31B; B31B70/00; B31B70/26; B31B70/261; B31B2155/00; B31B2160/00; B31B2160/10; B31B2160/106; B31B2170/00; B31B2170/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
386 words
An apparatus for manufacturing a carrying bag including an outer bag and an inner bag having a Z-fold formed therein comprising means for conveying a web having at least one layer for forming said outer bag in a first direction at a first speed, means for conveying a tubular material having transverse weld seams for forming the base of said inner bag, said tubular material conveying means including a first double-belt conveyor for conveying said tubular material in a substantially horizontal second direction at a higher speed than said first speed at which said web is conveyed, belt guide means positioned at the discharge end of said first double-belt conveyor and being movable forward and backward with respect to said second direction in which said tubular material is conveyed, a second double-belt conveyor positioned downstream from said first double-belt conveyor for conveying said tubular material at said first speed at which said web is conveyed and for depositing said tubular material onto said web, said second double-belt conveyor being positioned to convey said tubular material first slightly upwardly with respect to said substantially horizontal second direction and to then reverse the direction of travel of said tubular material so that it is traveling slightly downward in the opposite direction and in substantially the same direction as said first direction in which said web is conveyed, said belt guide means including first spaced apart belt guide rollers, spaced apart conveyor belts mounted on said first belt guide rollers, folding fingers mounted to be moveable forward and backward with respect to said first belt guide rollers, said folding fingers being mounted to be moved through the spaces between said conveyor belts and first belt guide rollers and to extend as far as the inlet end of said second double-belt conveyor, second belt guide rollers positioned at the inlet end of said second conveyor, spaced apart individual rollers mounted so as to be moveable forward and backward to cooperate with said second belt guide rollers, said individual rollers and the spaces between said rollers, respectively, being substantially in alignment with said first belt guide rollers and the spaces therebetween, means for shaping said web into tubular shape to form said outer bag and to envelop said inner bag, and means for dividing the resulting carrying bag from said web.
Claim 2
Independent Claim
386 words
An apparatus for manufacturing a carrying bag including an outer bag and an inner bag having a Z-fold formed therein comprising means for conveying a web having at least one layer for forming said outer bag in a first direction at a first speed, means for conveying a tubular material having transverse weld seams for forming the base of said inner bag, said tubular material conveying means including a first double-belt conveyor for conveying said tubular material in a substantially horizontal second direction at a higher speed than said first speed at which said web is conveyed, belt guide means positioned at the discharge end of said first double-belt conveyor and being movable forward and backward with respect to said second direction in which said tubular material is conveyed, a second double-belt conveyor positioned downstream from said first double-belt conveyor for conveying said tubular material at said first speed at which said web is conveyed and for depositing said tubular material onto said web, said second double-belt conveyor being positioned to convey said tubular material first slightly upwardly with respect to said substantially horizontal second direction and to then reverse the direction of travel of said tubular material so that it is traveling slightly downward in the opposite direction and in substantially the same direction as said first direction in which said web is conveyed, said belt guide means including first spaced apart belt guide rollers, spaced apart conveyor belts mounted on said first belt guide rollers, folding fingers mounted to be moveable forward and backward with respect to said first belt guide rollers, said folding fingers being mounted to be moved through the spaces between said conveyor belts and first belt guide rollers and to extend as far as the inlet end of said second double-belt conveyor, second belt guide rollers positioned at the inlet end of said second conveyor, spaced apart individual rollers mounted so as to be moveable forward and backward to cooperate with said second belt guide rollers, said individual rollers and the spaces between said rollers, respectively, being substantially in alignment with said first belt guide rollers and the spaces therebetween, means for shaping said web into tubular shape to form said outer bag and to envelop said inner bag, and means for dividing the resulting carrying bag from said web.
Claim 3
Dependent Claim
59 words
The apparatus of claim 1 in which said apparatus is suitable for handling pre-cut inner bag blanks of tubular material, said apparatus further comprising means for moving said individual rollers backwards during the Z-fold forming operation and subsequently moving said individual rollers forward before the leading end of the next inner bag is supplied to said second double-belt conveyor.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1 and further comprising means for moving said individual rollers.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 and further comprising means for spring biasing said individual rollers in the forward direction.
Claim 6
Dependent Claim
47 words
The apparatus of claim 1 and further comprising a nozzle positioned between said first and second double-belt conveyors and above the conveying plane of said first double-belt conveyor for directing an airstream downward toward said tubular material as it passes between said first and second double-belt conveyors.
Claim 7
Dependent Claim
101 words
The apparatus of claim 1 and further comprising levers rotatably mounted laterally of said first double-belt conveyor, a weighting rod secured between the free ends of said levers and adapted to be rotated between a position above the conveying plane of said first double-belt conveyor and a position in which said rod applies weight tO said tubular material, and means for rotating said levers so that said weighting rod moves away from said tubular material and above said conveying plane before said folding fingers are moved forward, said rod being capable of being held in said position above said conveying plane.
Claim 8
Dependent Claim
41 words
The apparatus of claim 6 and further comprising a frame supporting said first belt guide rollers, said frame being movable forward and backward with said first guide belt rollers and a cam drive for said weighting rod connected to said frame.
Claim 9
Dependent Claim
20 words
The apparatus of claim 6 in which said means for rotating said levers and moving said weighting rod is pneumatic.
Claim 10
Dependent Claim
33 words
The apparatus of claim 1 and further comprising a braking member positioned above said tubular material supported by said first double-belt conveyor and adapted to be brought into contact with said tubular material.
Claim 11
Dependent Claim
18 words
The apparatus of claim 9 in which said braking member is mounted to bearings on said individual rollers.
Claim 12
Dependent Claim
32 words
The apparatus of claim 10 and further comprising means for adjusting said braking members so that it remains positioned above said tubular material when said individual rollers are moved forward and backward.
Claim 13
Dependent Claim
29 words
The apparatus of claim 1 and further comprising stationary guide rods arranged adjacent to the conveying path between said first and second double-belt conveyors and above the conveying plane.
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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |