US3768949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flattening and take-off apparatus for blown tubular plastics film
Assignee: Windmoeller and Hoelscher KG
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Filing: 1971-07-19
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Granted: 1973-10-30
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Expires: 1991-07-19
Abstract
Abstract The apparatus serves to handle film made by a stationary blowhead and comprises flattening plates and squeeze rolls which are reversibly rotatable about the axis of the tubular film fed thereto. At least two direction-changing rolls for deflecting the web through about 180* and two turning rods for deflecting the web through about 180* with simultaneous change in direction are disposed in succession and in alternation between the flattening plates and take-off rolls, on the one hand, and a stationary pair of feed rolls, on the other hand, and are mounted on supports which are rotatable about the axis of rotation of the flattening plates and pivotally movable relative to each other. Said rolls and rods are arranged so that the axes of the direction-changing rolls and of the turning rods are tangential to circles centered on the axis of rotation of the flattening plates. The radius of the circle which is inscribed in the path of the pivotal movement of the axes of the turning rods is pi /4 diameter of the turning rods. The direction-changing rolls are in every possible operating position radially outwardly of those portions of the turning rods which are wrapped by the web.
Inventors
- 👤 H Upmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:43
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/001; B29C48/0018; B29C48/0019; B29C48/09; B29C48/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
273 words
A flattening and take-off apparatus for handling a blown tubing of plastics material made by a stationary blowhead comprising a reversingly rotatable central shaft, flattening plates and squeeze rollers mounted to said central shaft and adapted to be reversingly rotated through an angle up to 360* about the axis of said central shaft and of the fed tubing, a lateral direction changing rod for deflecting the fed tubing through an angle of about 180* mounted to said central shaft and positioned after the squeeze rollers and parallel to said squeeze rollers and adapted to be reversingly rotated in unison with said squeeze rollers about the axis of rotation of said central shaft and said flattening plates, at least three additional rods for deflecting the fed tubing through an angle of about 180* positioned after said lateral direction changing rod, each of said additional rods being mounted to said central shaft to be rotatable relative to each other about the axis of rotation of said central shaft and flattening plates, the first and third of said additional deflecting rods being positioned in the region of said axis of rotation, the second of said additional rods being a direction changing rod and being laterally positioned, the lateral direction changing rods being arranged at such a distance from said axis of rotation that they are, in all possible operating positions, positioned radially outwardly of the wrapped portions of said deflecting rods which are positioned in the region of said axis of rotation, and stationary means for guiding the tubing positioned after The last of said direction changing rods in the direction of travel of said tubing.
Claim 2
Dependent Claim
273 words
A flattening and take-off apparatus for handling a blown tubing of plastics material made by a stationary blowhead comprising a reversingly rotatable central shaft, flattening plates and squeeze rollers mounted to said central shaft and adapted to be reversingly rotated through an angle up to 360* about the axis of said central shaft and of the fed tubing, a lateral direction changing rod for deflecting the fed tubing through an angle of about 180* mounted to said central shaft and positioned after the squeeze rollers and parallel to said squeeze rollers and adapted to be reversingly rotated in unison with said squeeze rollers about the axis of rotation of said central shaft and said flattening plates, at least three additional rods for deflecting the fed tubing through an angle of about 180* positioned after said lateral direction changing rod, each of said additional rods being mounted to said central shaft to be rotatable relative to each other about the axis of rotation of said central shaft and flattening plates, the first and third of said additional deflecting rods being positioned in the region of said axis of rotation, the second of said additional rods being a direction changing rod and being laterally positioned, the lateral direction changing rods being arranged at such a distance from said axis of rotation that they are, in all possible operating positions, positioned radially outwardly of the wrapped portions of said deflecting rods which are positioned in the region of said axis of rotation, and stationary means for guiding the tubing positioned after The last of said direction changing rods in the direction of travel of said tubing.
Claim 3
Dependent Claim
39 words
Flattening and take-off apparatus according to claim 1, in which each of said first and third additional rods is spaced from the axis of rotation of said central shaft a distance equal to pi /4 times their respective diameters.
Claim 4
Dependent Claim
19 words
Flattening and take-off apparatus according to claim 1 including means for intercoupling the rotational movement of said additional rods.
Claim 5
Dependent Claim
16 words
Flattening and take-off apparatus according to claim 3, in which said intercoupling means comprises toothed gearing.
Claim 6
Dependent Claim
63 words
Flattening and take-off apparatus according to claim 4, in which said toothed gearing comprises double gears loosely mounted on an auxiliary shaft parallel to said central shaft and which co-operate with corresponding gear segments which are concentric with said central shaft and fixed to the mounting for said flattening plates, to the mounting for said additional rods and to a stationary bearing sleeve.
Claim 7
Dependent Claim
63 words
Flattening and take-off apparatus according to claim 4, in which said toothed gearing comprises single gears which are fixed to an auxiliary shaft parallel to said central shaft and which co-operate with corresponding gear segments which are concentric with said central shaft and fixed to the mounting for said flattening plates, the mountings for said additional rods and to a stationary bearing sleeve.
Claim 8
Dependent Claim
38 words
Flattening and take-off apparatus according to claim 5, in which said auxiliary shaft is held by a holder to the mounting for said second additional rod, said auxiliary shaft being held diametrically with respect to said central shaft.
Claim 9
Dependent Claim
17 words
Flattening and take-off apparatus according to claim 1, in which said intercoupling means comprises a lever system.
Claim 10
Dependent Claim
48 words
Flattening and take-off apparatus according to claim 8, in which said lever system comprises lazy tongs in which the points of intersection of the components of said lazy tongs cooperate with the mounting for said flattening plates, the mountings for said additional rods, and a stationary bearing sleeve.
Claim 11
Dependent Claim
31 words
Flattening and take-off apparatus according to claim 1 in which said squeeze rollers comprise two direction-changing rollers, which are spaced apart and wrap the flattened fed tubing in an S-shaped path.
Claim 12
Dependent Claim
26 words
Flattening and take-off apparatus according to claim 10, in which the second of said squeeze rollers and said lateral direction changing roller consist of cooled rollers.
Claim 13
Dependent Claim
42 words
Flattening and take-off apparatus according to claim 1, in which said second additional rod is held at a variable distance from said central shaft by means of a cam such that the length of the path said fed tubing follows remains constant.
Claim 14
Dependent Claim
236 words
Flattening and take-off apparatus for handling a blown tubing of plastics material made by a stationary blowhead comprising flattening plates and squeeze rollers adapted to be reversingly rotated through an angle up to 360* about the axis of the fed tubing, a lateral direction changing rod positioned downstream of the squeeze rollers and parallel to said squeeze rollers and adapted to be reversingly rotated in unison with said squeeze rollers about the axis of rotation of said flattening plates, at least three additional direction changing rods positioned downstream of said lateral direction changing rod, each of said additional direction changing rods being mounted to be rotatable about the axis of rotation of said flattening plates, the first and third of said additional direction changing rods being positioned in the region of said axis of rotation and being spaced from said axis of rotation a distance which is approximately equal to pi /4 times their respective diameters, the second of said additional direction changing rods being laterally positioned, the lateral direction changing rods being arranged at such a distance from said axis of rotation that they are, in all possible operating positioned, positioned radially outwardly of the wrapped portions of said directiOn changing rods which are positioned in the region of said axis of rotation, and stationary means for guiding the tubing positioned downstream of said direction changing rods in the direction of travel of said tubing.
Claim 15
Dependent Claim
236 words
Flattening and take-off apparatus for handling a blown tubing of plastics material made by a stationary blowhead comprising flattening plates and squeeze rollers adapted to be reversingly rotated through an angle up to 360* about the axis of the fed tubing, a lateral direction changing rod positioned downstream of the squeeze rollers and parallel to said squeeze rollers and adapted to be reversingly rotated in unison with said squeeze rollers about the axis of rotation of said flattening plates, at least three additional direction changing rods positioned downstream of said lateral direction changing rod, each of said additional direction changing rods being mounted to be rotatable about the axis of rotation of said flattening plates, the first and third of said additional direction changing rods being positioned in the region of said axis of rotation and being spaced from said axis of rotation a distance which is approximately equal to pi /4 times their respective diameters, the second of said additional direction changing rods being laterally positioned, the lateral direction changing rods being arranged at such a distance from said axis of rotation that they are, in all possible operating positioned, positioned radially outwardly of the wrapped portions of said directiOn changing rods which are positioned in the region of said axis of rotation, and stationary means for guiding the tubing positioned downstream of said direction changing rods in the direction of travel of said tubing.
Claim 16
Dependent Claim
39 words
Flattening and take-off apparatus according to claim 13, in which the first and third direction changing rods are spaced from the axis of rotation of the flattening plates by a distance which exceeds pi /4 times their respective diameters.
Claim 17
Dependent Claim
31 words
Flattening and take-off apparatus according to claim 13, in which the rotation axis of the first and third changing rods are intersected by the axis of rotation of the flattening plates.
Claim 18
Dependent Claim
41 words
Flattening and take-off apparatus according to claim 13, in which the first and third direction changing rods are spaced from the axis of rotation of the flattening plates by a distance which is less than pi /4 times their respective diameters.
Claim 19
Dependent Claim
70 words
Apparatus according to claim 14, including means for intercoupling the rotation of the direction changing rods so that the rotation of the first and third direction changing rods relative to the rotation of the second direction changing rod is 45* + Alpha /2 to 45* - Alpha /2, where Alpha is the angle between the center line of the fed tubing and the perpendicular to the second direction changing rod.
Claim 20
Dependent Claim
70 words
Apparatus according to claim 16, including means for intercoupling the rotation of the direction changing rods so that the rotation of the first and third direction changing rods relative to the rotation of the second direction changing rod is 45* - Alpha /2 to 45* + Alpha /2, where Alpha is the angle between the center line of the fed tubing and the perpendicular to the second direction changing rod.
References Cited (Backward Citations)
US3492693A
Cited
US3576935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |