US3734424A - Web tensioning support - Google Patents

Web tensioning support Download PDF

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Publication number
US3734424A
US3734424A US00142948A US3734424DA US3734424A US 3734424 A US3734424 A US 3734424A US 00142948 A US00142948 A US 00142948A US 3734424D A US3734424D A US 3734424DA US 3734424 A US3734424 A US 3734424A
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US
United States
Prior art keywords
arbor
support
sheet material
roll
braking torque
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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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US00142948A
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English (en)
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Publication date
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Classifications

    • 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
    • B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle

Definitions

  • ABSTRACT A web tensioning support for a roll of sheet material to permit the sheet material to be withdrawn from the roll by a generally uniform force.
  • An arbor is formed to support the roll of sheet material for rotation therewith and the arbor is supported for rotation by an arbor support and brake which frictionally engages the arbor along a surface area spaced from the axis of the arbor.
  • a constant braking torque is applied to the arbor to counterbalance the decrease in the force required to withdraw the sheet material from the roll against the frictional force applied by the arbor support and brake as the roll of sheet material is depleted.
  • the present invention relates to a support for a roll of sheet material having a hollow cylindrical core to permit withdrawal of the sheet material from the roll under a generally uniform tension.
  • back tension in a web has been provided by constant braking torque applied to the spindle or arbor supporting the roll of sheet material.
  • This method has been disadvantageous in that as the radius of the roll of sheet material decreases the force required to withdraw the sheet material from the roll increases as the reciprocal of the radius.
  • some of the more complex mechanisms sense the decrease in the radius of the roll and decrease the braking torque as the roll radius decreases.
  • Other prior art mechanisms have provided the back tensioning in the web by supporting the arbor or spindle on a friction surface which supports the weight of the arbor and the roll of sheet material and permits them to rotate against the frictional force between the arbor and the friction material. With this type of mechanism as the radius of the roll decreases, the force required to withdraw the sheet material from the roll also decreases.
  • the more complex mechanisms of this type include means to compensate for the decrease in the weight of the roll, as exemplified by U. S. Pat. No. 3,567,148 in which the roll of sheet material is supported at the end of a counterbalanced arm.
  • U. S. Pat. No. 3,567,148 in which the roll of sheet material is supported at the end of a counterbalanced arm.
  • a cylindrical arbor is formed to support the roll of sheet material for rotation therewith.
  • An arbor support and brake supports the arbor for rotation by frictionally engaging the arbor along a surface area spaced from the axis of the arbor and a constant braking torque is applied to the arbor in counterbalancing relationship to the frictional force applied by the arbor support and brake.
  • the constant braking torque applied to the arbor tends to increase the force necessary to withdraw the sheet material and the frictional force tends to decrease the necessary withdrawal force thereby aiding in maintaining the withdrawal force and the tension in the web constant.
  • FIG. 1 is an end view of a web tensioning support constructed in accordance with the present invention
  • FIG. 2 is a top view of the web tensioning support of FIG. 1;
  • FIG. 3 is a graphical representation of the performance of the web tensioning support of FIG. 1 in comparison to prior art devices.
  • the web tensioning support 10 comprises an arbor 12, an arbor support and brake l4 and means 16 for applying a constant braking torque to the arbor 12.
  • the arbor 12 comprises a hollow cylindrical tube formed to fit within and extend from the ends of a hollow core 18 of a roll of sheet material 19.
  • the arbor 12 is formed with a key 13 extending radially from its periphery to fit within a keyway slot 20 in the end of the roll core 18 to couple the roll of sheet material 19 to the arbor 12 for rotation therewith.
  • the arbor support and brake 14 comprises a pair of support blocks 22 and 25 formed with semi-circular recesses in their upper surfaces and having a strip of friction material 26 secured to the base of their recesses.
  • the support blocks 22 and 25 are spaced to support the ends of the arbor on the strips of friction material 26 and the friction material engages approximately of the peripheral surface of the arbor.
  • the means 16 for applying a constant braking torque to the arbor 12 comprises a pair of leaf springs 28 and 31, each being secured by one end to the upper surface of one of the support blocks 22 and 25, respectively.
  • Each leaf spring is formed to extend over the arbor adjacent one end of the arbor l2 and has a strip of a friction material 32 secured adjacent its free end.
  • the leaf springs 28 and 31 are chosen to apply a constant force between the friction material 32 and the ends of the arbor 12.
  • the constant braking torque applied by the leaf springs 28 and 31 and their friction material 32 is chosen to counterbalance the change in web tension effected by the arbor support and brake 14 as the roll of sheet material is depleted.
  • An idler roller 34 is provided as a guide over which the sheet material 19 may be withdrawn from the roll by a pair of drive rollers 36 and 37.
  • R the radius of the roll of sheet material.
  • W the weight of the roll of sheet material.
  • L the axial length of the roll of sheet material.
  • T T T mrLdR +(2p.rf/R)
  • T prrrLdR t/R
  • R the maximum radius of the roll of sheet material.
  • FIG. 3 is a graphical representation of the web tension as a function of the radius of the roll of sheet material utilizing the simplified formulas to illustrate the principle of operation.
  • t 5 inches per pound.
  • T The web tensions T and T were then calculated and plotted so that they would pass through the same point as Tat the average radius of the roll (3 inches).
  • T is represented in FIG. 3 by the short dashed lines and T is represented by the short and long dashed lines.
  • the variation in T as R goes from 5 to l is approximately 1.5 pounds, the variation in T is approximately 6.4 pounds, and the variation in T is approximately 1l.3 pounds.
  • T in this simplified model is more than four times better than either T or T alone.
  • a web tensioning support for a roll of sheet material comprising:
  • an arbor having a cylindrical support surface spaced from its axis and formed to coaxially support the roll of sheet material for rotation therewith,
  • R the radius of the full roll of sheet material
  • t the braking torque applied by said means for applying a braking torque to said arbor

Landscapes

  • Unwinding Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
US00142948A 1971-05-13 1971-05-13 Web tensioning support Expired - Lifetime US3734424A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14294871A 1971-05-13 1971-05-13

Publications (1)

Publication Number Publication Date
US3734424A true US3734424A (en) 1973-05-22

Family

ID=22501920

Family Applications (1)

Application Number Title Priority Date Filing Date
US00142948A Expired - Lifetime US3734424A (en) 1971-05-13 1971-05-13 Web tensioning support

Country Status (6)

Country Link
US (1) US3734424A (de)
CA (1) CA959029A (de)
DE (1) DE2223872A1 (de)
FR (1) FR2139465A5 (de)
GB (1) GB1358512A (de)
IT (1) IT957836B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721267A (en) * 1986-03-07 1988-01-26 Benson, Inc. Mounting assembly for a roll of material
US5458310A (en) * 1993-12-08 1995-10-17 Calcomp Inc. Adjustable and self-holding supply roll system for plotting devices
US5884860A (en) * 1996-03-19 1999-03-23 Ricoh Company, Ltd. Rolled paper feeding apparatus which provides a constant torque for uncurling paper and a torque limiting device therefor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3011452A1 (de) * 1980-03-25 1981-10-01 Krauss U. Reichert Gmbh + Co Kg Spezialmaschinenfabrik, 7012 Fellbach Legemaschine fuer stoff- u.a. materialbahnen
US4915319A (en) * 1988-10-21 1990-04-10 Gerber Garment Technology, Inc. Progressive plotter with brake for supply roll

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE209704C (de) *
US2777545A (en) * 1952-07-05 1957-01-15 Columbia Broadcasting Syst Inc Rotation retarding device for a reel carrying shaft
US2983463A (en) * 1957-03-21 1961-05-09 Cameron Machine Co Apparatus for controlling the tension in a running web
US3539127A (en) * 1968-10-14 1970-11-10 Caterpillar Tractor Co Rewind machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE209704C (de) *
US2777545A (en) * 1952-07-05 1957-01-15 Columbia Broadcasting Syst Inc Rotation retarding device for a reel carrying shaft
US2983463A (en) * 1957-03-21 1961-05-09 Cameron Machine Co Apparatus for controlling the tension in a running web
US3539127A (en) * 1968-10-14 1970-11-10 Caterpillar Tractor Co Rewind machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721267A (en) * 1986-03-07 1988-01-26 Benson, Inc. Mounting assembly for a roll of material
US5458310A (en) * 1993-12-08 1995-10-17 Calcomp Inc. Adjustable and self-holding supply roll system for plotting devices
US5884860A (en) * 1996-03-19 1999-03-23 Ricoh Company, Ltd. Rolled paper feeding apparatus which provides a constant torque for uncurling paper and a torque limiting device therefor

Also Published As

Publication number Publication date
FR2139465A5 (de) 1973-01-05
CA959029A (en) 1974-12-10
IT957836B (it) 1973-10-20
GB1358512A (en) 1974-07-03
DE2223872A1 (de) 1972-11-23

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