Patent US3783750A successfully refreshed from Google Patents.
US3783750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming packages of bags made from plastics material
Assignee: Verenigde Fab Van L J Heijmeijer N V nl
•
Filing: 1971-06-07
•
Granted: 1974-01-08
•
Expires: 1991-06-07
Abstract
Abstract A method and apparatus for forming a package of plastics bags, wherein a web of flattened tubular bag material is intermittently fed to welding and perforating stations where the web is respectively welded transversely to define the bag bottoms and perforated transversely to form scorelines along which the bags can be separated for use. The intermittent web movement is converted to continuous motion prior to coiling the leading length of web onto rotary prongs of a winding head. The prongs are arranged in a circle, the circle of prongs being contractable to facilitate stripping of the coil. There are two alternately operable such winding heads. While the prongs of one of the heads are not rotating, they are projected longitudinally so that the web being coiled on the other head passes through the circle defined by the stationary prongs. Upon braking said other head and simultaneously setting said one head into rotation, the coiled length is severed from the rest of the web along one of the scorelines and the next coil is formed on said one head.
Inventors
- 👤 C Heimeijer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:34
CPC Classifications
B; B65; B65B; B65B25/00; B65B25/14; B65B25/146; B31; B31B; B31B2155/00; B31B2155/001; B31B2155/0014; B31B2160/00; B31B2160/10; B31B2160/106; B31B70/00; B31B70/74; B31B70/92; B31B70/94; B31B70/942; B31B70/946
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
156 words
Apparatus for forming packages of plastic bags, wherein a flattened tubular web of plastics material provided at intervals with transverse weld seams defining the bases of the bags and with adjacent transverse scorelines disposed between successive bags is wound into a coil, the apparatus comprising first and second winding heads each provided with a plurality of winding prongs on which the web is wound, means for moving the prongs between a spread-apart position, at which the prongs are at a maximum spacing from one another, and a contracted position, mEans for axially reciprocating the prongs between an extended operative position in which the web can be wound thereon and a retracted inoperative position in which the web can be positioned between the prongs, and means for moving the prongs to the spread-apart position before the prongs are moved to the operative position and to the contracted position before the prongs are moved to the inoperative position.
Claim 2
Dependent Claim
156 words
Apparatus for forming packages of plastic bags, wherein a flattened tubular web of plastics material provided at intervals with transverse weld seams defining the bases of the bags and with adjacent transverse scorelines disposed between successive bags is wound into a coil, the apparatus comprising first and second winding heads each provided with a plurality of winding prongs on which the web is wound, means for moving the prongs between a spread-apart position, at which the prongs are at a maximum spacing from one another, and a contracted position, mEans for axially reciprocating the prongs between an extended operative position in which the web can be wound thereon and a retracted inoperative position in which the web can be positioned between the prongs, and means for moving the prongs to the spread-apart position before the prongs are moved to the operative position and to the contracted position before the prongs are moved to the inoperative position.
Claim 3
Dependent Claim
38 words
Apparatus according to claim 1, wherein both heads are disposed symmetrically with respect to the plane of symmetry of a pair of guide rolls which are disposed upstream of the heads and between which the web is passed.
Claim 4
Dependent Claim
29 words
Apparatus according to claim 1, wherein the axes of the prongs of each head are disposed on an imaginary cylindrical surface when the prongs are in their spread-apart condition.
Claim 5
Dependent Claim
72 words
Apparatus according to claim 1, wherein the prongs of each head are each fixed to one side of a cheek the other side of which carries a pivot pin of which the axis is offset from the axis of the associated prong, all the pivot pins of the prongs of each winding head being mounted in a cylindrical housing with the axes of the pins uniformly distributed on an imaginary cylindrical surface.
Claim 6
Dependent Claim
84 words
Apparatus according to claim 4, wherein the housing of each head is fixed to a hollow spindle which is parallel to the prongs and rotatably carried by a slide plate which is reciprocatable in a direction parallel to the length of the prongs and which is engaged by an adjusting mechanism for periodically displacing the slide plate between a first position in which the prongs assume their operative position and a second position in which the prongs assume their inoperative position, and vice versa.
Claim 7
Dependent Claim
22 words
Apparatus according to claim 5, wherein the slide plate of each head carries a motor for intermittently driving the associated hollow spindle.
Claim 8
Dependent Claim
14 words
Apparatus according to claim 5, wherein the hollow spindle is provided with brake means.
Claim 9
Dependent Claim
137 words
Apparatus according to claim 5, wherein a mandrel is longitudinally reciprocatable within the spindle between an operative position and an inoperative position and is provided at one end with a conical portion which, upon displacement of the mandrel from its inoperative to its operative position co-operates with guide faces on the cheeks to displace the prongs to their spread-apart condition, and wherein a dog engages the other end of the mandrel and is connected to an actuating rod which extends parallel to the winding prongs and which is displaceable in a guide block fixed to the slide plate and having a slot through which the dog passes, the ends of the slots limiting displacement of the dog relatively to the slide plate and of the mandrel relatively to the spindle, the adjusting mechanism engaging the actuating rod.
Claim 10
Dependent Claim
14 words
Apparatus according to claim 8, wherein the mandrel is rotatable relatively to the dog.
Claim 11
Dependent Claim
28 words
Apparatus according to claim 5, wherein displacement of the slide plate to the position in which the prongs are in their operative condition is limited by a stop.
Claim 12
Dependent Claim
36 words
Apparatus according to claim 4, wherein a rotatable stripping ring extends about the prongs directly adjacent the cheeks in the operative position of the prongs and is free from the prongs in the inoperative position thereof.
Claim 13
Dependent Claim
23 words
Apparatus according to claim 7, wherein the stripping ring has a central aperture communicating with radial slits for the passage of the prongs.
Claim 14
Dependent Claim
35 words
Apparatus according to claim 8, wherein at least some of the prongs are displaceable to their contracted condition under the action of gravity when the mandrel is displaced from its operative to its inoperative position.
Claim 15
Dependent Claim
18 words
Apparatus according to claim 1, including springs acting on the prongs to bias same to their contracted condition.
Claim 16
Dependent Claim
66 words
Apparatus according to claim 1, wherein the two winding heads co-operate with a change-over lever to which a second lever is pivoted at its free end, the second lever carries direction-changing rolls, the change-over lever is pivotable abouT an axis disposed in the plane of symmetry of the two winding heads and drive means are provided for periodically swinging the change-over lever between two limiting positions.
Claim 17
Dependent Claim
117 words
Apparatus according to claim 15, wherein a sprocket which is coaxial with the pivotal axis of the change-over lever is connected by a chain to a second sprocket which is fixed to the second lever, whereby during swinging of the change-over lever the second lever pivots relatively to the change-over lever in a direction opposite to the swinging movement of the change-over lever so that the direction-changing rolls carried by the second lever guide the web in the two limiting positions of the change-over lever in such a way that the web passes through substantially the central medial line of the set of prongs of the stationary winding head before reaching the prongs of the rotating head.
Claim 18
Dependent Claim
25 words
Apparatus according to claim 2, wherein a pair of continuously and uniformly driven supply rolls for the web is provided upstream of the guide rolls.
Claim 19
Dependent Claim
59 words
Apparatus according to claim 17, wherein a compensating device is provided between the pair of continuously driven supply rolls and the pair of guide rolls, the compensating device comprising at least one roll mounted on a fixed shaft and at least one roll mounted on a shaft carried by a compensating lever which is pivotable about a horizontal axis.
Claim 20
Dependent Claim
15 words
Apparatus according to claim 18, wherein the lowermost position of the compensating lever is adjustable.
Claim 21
Dependent Claim
24 words
Apparatus according to claim 2, including a folding triangle upstream of the guide rolls effective to fold the web about its longitudinal centre line.
Claim 22
Dependent Claim
134 words
Apparatus according to claim 17, including welding means and a scoreline applicator through which the web passes, a pair of intermittently driven feed rolls for the web upstream of the welding means, a pair of intermittently driven supply rolls for the web downstream of the scoreline applicator moving in synchronism with the feed rolls, the welding means and scoreline applicator being operative durin the standstill periods of the intermittently driven feed and supply rolls, and a transformer mechanism disposed between the intermittently driven supply rolls and the continuously driven supply rolls, wherein the transformer mechanism comprises at least one roll mounted on a shaft carried by a pivotable transformer lever and at least one roll mounted on a fixed shaft, pivotal movement of the transformer lever being controlled by a continuously driven cam roller.
Claim 23
Dependent Claim
50 words
Apparatus according to claim 21, wherein the cam roller is fixed to a shaft driven by a chain from a sprocket which is mounted on the same shaft as an eccentric roller, the shaft being continuously driven and the eccentric roller controlling an adjustable welding element of the welding means.
Claim 24
Dependent Claim
53 words
Apparatus according to claim 21, wherein the transformer lever carries an adjustable clamping member engaging one end of an actuating rod of which the other end is hinged to one end of a pivotable lever, the other end of the pivotable lever carrying a cam follower roller which co-operates with the cam roller.
References Cited (Backward Citations)
US1866585A
Cited
US2942796A
Cited
US2973157A
Cited
US2961177A
Cited
US3552278A
Cited
US3684202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |