US3790056A - Method and apparatus for equalizing longitudinal variations in the running of a web under tension - Google Patents

Method and apparatus for equalizing longitudinal variations in the running of a web under tension Download PDF

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Publication number
US3790056A
US3790056A US00083218A US3790056DA US3790056A US 3790056 A US3790056 A US 3790056A US 00083218 A US00083218 A US 00083218A US 3790056D A US3790056D A US 3790056DA US 3790056 A US3790056 A US 3790056A
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United States
Prior art keywords
web
variations
length
hollow cylinder
phase
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00083218A
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English (en)
Inventor
E Werner
W Schmidt
W Kornelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kalle GmbH and Co KG
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Kalle GmbH and Co KG
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Filing date
Publication date
Priority claimed from DE19681774310 external-priority patent/DE1774310C3/de
Application filed by Kalle GmbH and Co KG filed Critical Kalle GmbH and Co KG
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Publication of US3790056A publication Critical patent/US3790056A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally

Definitions

  • ABSTRACT This invention relates to a method and apparatus for equalizing longitudinal variations in the running of a I web under tension, wherein the web is passed over a support therefor which is at least partially oscillatable in accordance with the longitudinal'variations of the web and the oscillatable portions of which are' of such low inertia that they oscillate in phase with the oscillating web, and the non-oscillating portions of the web are supported.
  • the equalizing roller does not execute a swinging movement, but moves in inclined guides and is again provided with balancing weights or, alternatively, suspended from springs. It executes an upward and downward reciprocating movement, and the web partially envelops the roller.
  • balancing weights or, alternatively, suspended from springs. It executes an upward and downward reciprocating movement, and the web partially envelops the roller.
  • phase-displacement also I occur inthis type of arrangement.
  • the present invention provides a method for equalizing longitudinal variations, especially short-phase longitudinal variations, and/or longitudinal web oscillations in the running of a web under tension, wherein the web is passed over a support therefor which is at least partially oscillatable in accordance with the longitudinal variations of the web and the oscillatable portions of which are of such a low inertia that they oscillate in phase with the oscillating web, and the non-oscillating portions of the web are supported.
  • This substantially inertia-free method for equalizing longitudinal variations, especially short-phase longitudinal variations and/or longitudinal web oscillations, is equally suitable for webs subjected to high or low tensile stress-and is irrespective of the sensitivity of the web.
  • the support which is capable of oscillation as indicated, is either fixed to the carrierin a manner allowing of such oscillation, or, preferably, is capable of movement in the direction of travel of the webin contact with it. Movement of the support preferably takes place at the same surface speed as the speed of .the web.
  • the carrier is either fixed, or, if separate from the support, may be movable, preferably. in synchronism with the support.
  • the support and the carrier may be mounted at any desired point, for example in contact with the outer winding of a roll of web on a supply or take-up core.
  • the method of the invention is able to deal with webs of cellulose or plastic sheeting of any kind, which may have been surface-treated or coated.
  • the method is likewise applicable to paper or textile webs, metal foils and other sheet material or coated material of any de-
  • the tensioned web is brought into contact with the a surface of the described support and is-conducted in such a way that, as the web tension varies, the support surface is deformed in accordance with the longitudinal Y variation of the web.
  • the proper functioning of this arrangement depends largely on making the ratio of the mean value of web tension to the restoring force of the oscillating support such that a mean deformation results from a mean web tension.
  • oscillations can be equalized which'include high frequencies of web-variation up to about 50 oscillations per second.
  • the method of the invention is particularly suitable for oscillations in the range of about five to 30 per second.
  • the oscillations may be observed by means of a stroboscope in the vicinity of the support, and the frequency can be easily read on a scale.
  • the method of the invention also enables the equalization of oblique tensions and sagging in the web.
  • the width of the web to be equalized is not a critical factor for the method of the invention. Obviously, the width of the support should be at least equal to the width of the web. Equaliztion of a longitudinal variation is largely dependent upon the amount of deformation of the support and upon the length of the web section in contact with the support. Accordingly, if large length variations or tensile variations are to be equalized in the web, a larger support will be selected, a smaller support being suitable for samll longitudinal variations.
  • the invention further provides an apparatus for use in the method of the invention including a carrier of circular cross-section upon which is suspended, as a support for the web, a hollow cylindrical sleeve of internal diameter greater than the external diameter of the carrier, which sleeve is of resiliently flexible material and capable of being deformed by a running web looped around it.
  • the carrier may be a rotatable roller or rollers, or may be of rod-like nature.
  • the resiliently flexible material for the hollow cylindrical support is deformable under pressure and may be spring steel or a strong plastic foil.
  • the support may consist of one or more layers of thick plastic film, usually wound in a rectangular manner or in spiral form, or of a closed tubular cylinder. A combination of plastic film and thin spring steel strips also may be employed. The degree of resilience of the support need not be very great and depends on the mean tension prevailing in the web.
  • Another embodiment of the apparatus may include, likewise suspended upon the carrier and between it and the sleeve, one or more further sleeves, each sleeve being of greater internal diameter than the external diameter of the carrier or sleeve within it and the materials of the sleeves being such that all are resiliently deformable by a running web looped around the outer sleeve.
  • the materials of the various sleeves may be the same or different.
  • the sleeve or sleeves either may be fixed or capable of moving in the web direction.
  • the carrier and the sleeve 'or sleeves are each separate and rotatable. Rotation is preferably such as to give a surface speed equal to the speed of the web.
  • a still furher embodiment of the invention includes, as support for the web, a hollow cylindrical sleeve of resiliently flexible material whichis capable of being deformed by a web running over it, the sleeve being externally mounted on a pair of spaced rotatable rollers and a retaining member for the sleeve being mounted within it.
  • FIG. 1 is a perspective view of one embodiment in the unstressed condition
  • FIG. 2 is a similar view of the same embodiment in a stressed condition, also showing auxiliary rollers,
  • FIG. 3 is a similar view to FIG. 1 ofa second embodiment
  • FIG. 4 is a perspective view of a third embodiment in a stressed condition
  • FIG. 5 is a similar view to FIG. 1 with an adjacent winding roller, the embodiment of FIG. 1 being shown in the unstressed condition.
  • FIG. 6 is also a perspective view, which shows the arrangement of FIG. 5 in operation with an auxiliary roller, and
  • FIG. 7 is an end elevation showing the principle of operation of the embodiment of FIGS. 1 and 2.
  • a roller 1 is mounted for free and/or positive rotation and/or for retention in a fixed position and carries a flexible cylindrical sleeve 2 which can be freely supported on the roller 1, or fixed to it when the roller is fixed, or canbe positively rotated independently of the roller 1.
  • the sleeve 2' is circular, but when stressed by passage of a web around it, it can become deformed.
  • roller 1 and sleeve 2a are separate and both freely rotatable by passage of a web 6.
  • Sleeve 2a is shown deformed into an oval shape under the web tension.
  • the web is shown guided by rollers 8 and 9 and the arrangement is such that the change of direction of the web around the deformed sleeve 2a is approximately 180.. The. operation could be conducted with larger or smaller web loop angles.
  • FIG. 3 includes a plurality of flexible sleeves 2, 3 and 3 of different diameters.
  • the inner sleeves are of suitable flexibility relative to the outer sleeve 2.
  • FIG. 4 a flexible sleeve 2 is shown supported on two rollers 4, 5.
  • a member 7 is provided within the sleeve but its function is merely to prevent the sleeve 2 from being dislodged.
  • This embodiment is especially suitable in the case of small looping angles of the web 6 because for this arrangement greater resilieht deformation of the sleeve can be achieved.
  • FIG. 5 illustrates a theoretical unstressed position of the main components of FIG. 6, showing, on a core, a web roll 10 of which the true shape is shown somewhat exaggerated in FIG; 6.
  • FIG. 6 The arrangement of FIG. 6 is intended to run at high speeds.
  • the deformed sleeve is given the numeral 11. It is in contact with the outer winding of the roll 10 produced by a web 12 and, by changing its degree of deformation, can follow the outline of the roll. The tension in the web 12 is thereby equalized.
  • An auxiliary roller 13 prevents excessive lateral movement of the sleeve 11.
  • FIG. 7 shows in particular the variation of the length of the path of a web 6 due to deformation'of a sleeve 2. If it could be assumed, in the'first place, that the web 6 were not tensioned, the sleeve 2 would retain its circular section. The path of the web between points A and B would then be a maximum. At the other extreme, assuming maximum deformation of the sleeve 2, the web would take a path corresponding to the broken line 6', which is the minimum possible path between points A and B. Theoretically the degree of deformation of the sleeve 2 could vary between these limits. In practice a path approximately corresponding to the dotted line 6" would be selected, this line corresponding to the medium web tension.
  • the support 2 of resiliently flexible material wound in the form of a circle or consisting of a tube is pushed over the carrier 1,
  • the roational speed of the two surfaces may be determined by the feed speed of the material web 6 passing over them.
  • the resilience of the support 2 may .be adjusted by the number of wound layers or by the thickness of the material selected.
  • the web 6 is passed around the support 2 at a web loop angle, so that the support 2 is compressed and deformed under the action of the web tension and assumes a somewhat longer, approximately oval'shape. Due to its resilience, the support 2 has the tendency to revert to its original shape and thus exerts a force upon the web which should approximately correspond in the magnitude thereof to the tension present in the web.
  • the advancing material web is in engagement with the surface of the elastic support by means of the generated friction and thus ensures that the circumferential speed of the support 2 and the feed speed of the material web 6 are identical.
  • the width of-the web depends only upon the width of the carrier and that of the support.
  • a particularly suitable working range comprises widths of from 0.01 to about 5 meters.
  • width Usually there is no limitation as to width if the carrier can be provided with adequate bending strength even. in large widths, without influencing the oscillating support by its own weight. Accordingly, the support can be adapted to low or high web tensions even with large web widths, without there being a risk of flexing over the width of the web.
  • a further advantage attained by the invention is the fact that the masses of the individual or multiple supports which participate in the oscillation can be maintained very low, so that the system can be considered as largely inertia-free.
  • a pendulum-type roller for exam- 6 ple, would touch only the highest points of the roll and would be incapable, due to inertia, of contacting the wound roll over its entire periphery.
  • the method of the present invention ensures permanent contact at constantly defined pressure, even at high'running speeds, and thus makes for a far better structure of the wound roll. Even sensitive webs can be run at very low web tension and even sudden peak tensions will not destroy the web.
  • An apparatus for straightguiding and simultaneously compensating for variations in length, especially short-phase variations in length, in the running of c a web under tension and arriving at the apparatus with cillation when a web is passed thereover are oscillated inphase between a cylindrical and an oval form relative to the arriving variations in length, and at least two deflector means for looping a web around said cylinder means.
  • An apparatus as claimed in claim 1 comprising at least one additional hollow cylinder means of a flexible material between said carrier means and said hollow cylinder, the diameter of said additional hollow cylinder being greater than that of said carrier means and smaller than that of said hollow cylinder and said additional cylinder having a low inertia so that parts capable of oscillation by passage of a web over said hollow cylinder oscillate in phase with the arriving variations in length.
  • An apparatus as claimed in claim 1 including an auxilary roller for limiting movement of said hollow cylinder away from the surface of an adjacent roll.
  • An apparatus for straight guiding and :simultaneously compensating for variations in length, es'pe-. cially short-phase variations in length, in the running of a web under tension and arriving at the apparatus with said variations in length, comprising at least one retain- 1 ing means,
  • a freely rotatable, flexible, hollow cylinder means surrounding said retaining means, said cylinder means having a diameter greater than that of said retaining means and a low inertia so that parts capable of oscillation when a web is passed thereover are oscillated in phase between a cylindrical and an oval form relative to the arriving variations in length, and a pair of spaced, external roller means for supporting said cylinder means.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Winding Of Webs (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)
  • Nonwoven Fabrics (AREA)
US00083218A 1968-05-21 1970-10-22 Method and apparatus for equalizing longitudinal variations in the running of a web under tension Expired - Lifetime US3790056A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681774310 DE1774310C3 (de) 1968-05-21 Vorrichtung zum Ausgleich von Längenänderungen an fortbewegten Materialbahnen

Publications (1)

Publication Number Publication Date
US3790056A true US3790056A (en) 1974-02-05

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Application Number Title Priority Date Filing Date
US00083218A Expired - Lifetime US3790056A (en) 1968-05-21 1970-10-22 Method and apparatus for equalizing longitudinal variations in the running of a web under tension

Country Status (17)

Country Link
US (1) US3790056A (it)
JP (1) JPS4811833B1 (it)
AR (1) AR194333A1 (it)
AT (1) AT291742B (it)
BE (1) BE733272A (it)
BR (1) BR6908776D0 (it)
CH (1) CH494697A (it)
CS (1) CS157065B2 (it)
DK (1) DK122444B (it)
ES (1) ES367406A1 (it)
FR (1) FR2011859A1 (it)
GB (1) GB1264212A (it)
LU (1) LU58665A1 (it)
NL (1) NL6907134A (it)
RO (1) RO55775A (it)
SE (1) SE351616B (it)
YU (1) YU31574B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787544A (en) * 1986-05-05 1988-11-29 Jones Charles R Dancer roller
US5005778A (en) * 1989-11-28 1991-04-09 E. B. Eddy Forest Products Ltd. Web winding apparatus
US5251364A (en) * 1991-06-25 1993-10-12 E. I. Du Pont De Nemours And Company Drawing device for synthetic filaments

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8602585A (nl) * 1986-10-15 1988-05-02 Philips Nv Bandtransportinrichting, alsmede bandprocesinrichting voorzien van een dergelijke bandtransportinrichting.
NL8800855A (nl) * 1988-04-05 1989-11-01 Philips Nv Magneetbandapparaat voorzien van een rijgmechanisme welke een magneetband en een riem, voor de vorming van bandbuffers, verplaatst.
NL8800856A (nl) * 1988-04-05 1989-11-01 Philips Nv Magneetbandapparaat voorzien van een regeleenheid ter sturing van bandbuffers, de bandspanning en het bandtransport.
CN112976622B (zh) * 2021-04-20 2022-11-29 台州道麒新材料股份有限公司 一种发泡片材生产线

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4787544A (en) * 1986-05-05 1988-11-29 Jones Charles R Dancer roller
US5005778A (en) * 1989-11-28 1991-04-09 E. B. Eddy Forest Products Ltd. Web winding apparatus
US5251364A (en) * 1991-06-25 1993-10-12 E. I. Du Pont De Nemours And Company Drawing device for synthetic filaments

Also Published As

Publication number Publication date
JPS4811833B1 (it) 1973-04-16
ES367406A1 (es) 1971-04-01
YU31574B (en) 1973-08-31
CS157065B2 (it) 1974-08-23
GB1264212A (it) 1972-02-16
DK122444B (da) 1972-03-06
LU58665A1 (it) 1971-06-25
DE1774310B2 (de) 1977-04-07
SE351616B (it) 1972-12-04
AT291742B (de) 1971-07-26
CH494697A (de) 1970-08-15
AR194333A1 (es) 1973-07-13
BR6908776D0 (pt) 1973-01-11
BE733272A (it) 1969-11-19
RO55775A (it) 1974-03-01
DE1774310A1 (de) 1971-07-29
YU124869A (en) 1973-02-28
NL6907134A (it) 1969-11-25
FR2011859A1 (it) 1970-03-13

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