US3164247A

US3164247A - Apparatus for guiding wide belts

Info

Publication number: US3164247A
Application number: US152303A
Authority: US
Inventors: Raymond L Hall
Original assignee: SKI DEK CORP
Current assignee: SKI DEK CORP
Priority date: 1961-11-14
Filing date: 1961-11-14
Publication date: 1965-01-05
Anticipated expiration: 1982-01-05
Also published as: DE1204580B; GB996850A

Abstract

996,850. Artificial ski-slopes. SKI-DEK CORPORATION. Nov. 13, 1962 [Nov. 14, 1961], No. 42875/62. Heading A6D. An artificial ski-slope comprises an endless belt 16 of material such as nylon pile fabric entrained over rollers 14 and 15, the former being driven from a prime mover 19, means being provided for correcting any lateral displacement of the belt relative to the rollers, resulting from manoeuvres executed by skiers on the slope. The correction is effected by means of auxiliary endless belts 35 entrained in grooves 36 formed in the roller 15 and over grooved pulleys which are supported from the frame of the slope so as to be laterally displaceable relative thereto, the pulleys being connected to displaceable feeler rollers 48 located on opposite sides of the lower run of the belt 16. Thus displacement of the belt 16 results in displacement of the belts 35, so that the latter are fed to their respective grooves 36 at an angle and tend to rise out of the grooves. The weight of the belt 16, however, forces the auxiliary belts back into their grooves, the sloping sides of the grooves causing simultaneous lateral displacement of the auxiliary belts, and the coefficient of friction between the belts 16 and 35 is arranged to be such that the belt 16 is also moved laterally, thereby gradually correcting its original displacement. When the correction is completed, the feeler rollers 48 and grooved pulleys resume their normal positions and the belts 35 resume their movement parallel to the direction of movement of the belt 16 and are located within the grooves 36.

Description

Jan. 5, 1965 R. L. HALL APPARATUS FOR GUIDING WIDE BELTS Filed Nov. 14, 1961 4 Sheets-Sheet 1 Jan. 5, 1965 R. L.. HALL 3,164,247

APPARATUS FOR GUIDING WIDE BELTS Filed NOV. 14, 1961 4 Sheets-Sheet 2 INVENT l 19,4

F/G' 6 KAY/70N@ Jan. 5, 1965 R. L. HALL 3,164,247

APPARATUS FOR GUIDING WIDE BELTS Filed Nov. 14, 1961 4 Sheets-Sheet 3 Jan. 5, 1965 R. L. HALL APPARATUS FOR GUIDING WIDE BELTS Sheets-Sheet 4 Filed Nov. 14, 1961 I i lI L Y is reliable impor-forming its intended function.

United States Patent 3,i6fi,24;7

APPARATUS FR GUIDING WIDE BELTS Raymond L. Hall, @aidu/ell, NJ., assigner to Ski-Dek Corporation, Caldwell, N J a corporation oi? Deiaware Fiied Nov. 11i', Hoi, Ser. No. 152,393 9 Claims. (Ci. 19d- 2912) The present invention relates to a method of and apparatus for controlling a continuous moving web and more particularly to an improved apparatus for maintaining a wide belt in a substantially straight path.

Wh'Lle the present invention may have other uses it is particularly adapted for and is shown applied to an apparatus for simulating a natural ski slope. The artificial ski slope comprises an inclined deck Aand a continuous belt of a material having a low coehcient of friction, such as a nylon pile fabric, which moves up the deck at a substantial rate of speed. The belt is mounted on rollers at the top and bottom of the slope and thus forms a continuous web. The belt has a considerable width of, for example, sixteen feet and a length of, for example, thirty feet. The total weight of such belt is approximately ifteen hundred pounds and moves at speeds which may vary between tive and twenty miles an hour at'the option of the skier. Such an artificial ski slope gives the person skiing `on the belt a sensation' of moving down the slope which'simulates actual skiing on a naturalV ski slope. `A person using the ski slope may perform conventional maneuvers, such as plowing to reduce speeds, Christiana turns, jump turns, andthe like, and such maneuvers are apt to lproduce a resultant force onVV the belt tending to move it laterally in one or 4the `other-` of two directions. InV

addition, the belt may have an `inherent characteristic tending to cause it to drift laterally in either. direction.

Conventional methods of belt control, such as crowned pulleys, tilting rollers and the like, were found `to be unsatisfactory in controlling a belt of such width and eight` Automaticallyk operated jacks for tilting a supporting roller were found to require continuous adjustment, tended to overcompensate, required considerable horsepower because of the weight involved and did not operate satisfactorily to maintain the belt in a substantially straight path.

Gne of the objects of the present invention is to provide an improved method of and -apparatusfor controlling the path of movement of a continuous web which utilizes the energy Vin the moving webitself to provide the force required tochange its direction.v Y t Another object is to provide a-method of and apparatus for maintaining a moving belt in a substantially straight lpath by directing an auxiliary control belt between it and ratus of the type indicated which is of simple and compact construction, economical to manufacture and Aone whic These yand other objects willC become more apparent from the'following description and drawings in which likereference characters denote like parts throughout the several views. It is to be expressly understood, however,

that the drawings are for the purpose of illustration only andare not a denitionof the limitsof the invention, reference being had for this purpose to the appended claims. l

attratti Patented dan. 5 i965.

IQC

In the drawings: FIGURE l is a side elevational view of an artificial ski slope incorporating the novel web controlling device of the present invention;

FIGURE 2 is a plan view of the simulated ski slope, partly in section, and showing a plurality of auxiliary control belts operating between the main belt and V- grooves in a supporting roller to maintain the main belt in a substantially straight path;

FIGURE 3 is an enlarged sectional view of the lower roller in side elevation and showing the auxiliary control belts seated in the grooves between the main belt and its supporting roller when the main belt is tracking properly;

FIGURE 4 is a sectional plan of the lower roller and showing the three different directions that the auxiliary control belts may feed toward the V-grooves in the supporting roller;

FIGURE 5 is a sectional view of a portion of the left hand end of the supporting roller and showing one V-groove and the manner in which the upper course of the main belt is shifted toward the right when the auxiliary control belt feeds from the left toward the right;

FIGURE 6 is a view similar to FIGURE 5 showing the manner in which the upper course of the main belt is shifted towardthe left when the auxiliary control belt- -y feeds from the right toward the left; v

v FIGURE 7 is an enlarged sectional View through one z of the grooves to showthe ysmoothlining of an antifriction material on the inclined sides of the groove;

FIGURE 8 is a transverse sectional'view taken on line i 3 8 of FIGURE 2 vto show an auxiliaryfcontrolbelt between the main belt to'be controlled and supporting roller rality of pivotally mounted depending armsfor the guideV pulleys and Yfeele'rs; A T

FIGURE 11 is a section taken on line 11--11 of FIG- URE l0 to show the bracket for mounting the depending pivoted arm carrying the feelers` at one end of the sliding Y control bar; and y FIGURE l2 is a partial sectional View taken on linev iZ-'iZ of FIGURE 10 to show the bracket for pivotally mounting one of the depending arms mounting a guide The method of the present invention comprises the steps ofi-sensing any change in the direction of movement of a web to be controlled, such as the wide belt of an artificial ski slope, and utilizing such change in direction to change the position of a belt guide for guiding one or more narrow control belts between the belt to be controlled and a V-shaped groove in a web supporting roller and at-an angle to the direction of movement of the main belt. For example, if the belt tends to move toward the right, the narrow control belt is guided atv an angle to the direction of movement of the main belt from the right toward the left; if the beltrtends to move toward the left, the narrow belt is guided at an angle to the mainy I belt from. the left toward the right; and if the belt is tracking properly the control belt is guided in a direction parallel to the main belt.f The langular movement of the auxiliary control belt is y,then utilized to bodily shift the A main belt to a corrective position and the rate of shifting' degree ofthe angle of the auxiliary smooth inclined sides to present a minimum frictional resistance. To this end, the sides ofthe. grooves may be coated with material having' a low coefficient of friction,

Vof a skier using the slope.

.each auxiliary control belt at an angle to the path of movement of .the belt to be controlled, the frictional contact of the periphery of the auxiliary control belt with the belt to be controlled produces a lateral force on the latter as the sides of the control belt are forced downwardly into the V-shaped groove on the roller and laterally by the inclined side thereof. Stated another way, the belt to be controlled forces the control belt to seat in the V-shaped groove as it wraps around the roller and to be cammed laterally by the inclined side of the groove, but the frictional contact of the periphery of the control belt with the belt to be controlled causes the latter to move laterally with the auxiliary belt.

v It will be observed that the method of controlling in accordance with the present invention untilizes the energy in the web or belt itself to control and change its direction of movement. As a belt to be controlled moves toward and around a supporting roller it drives the auxiliary control belt with it in the same direction and the force and weight of the main belt wrapping around its supporting roller forces or jams the auxiliary control belt in to the V-shaped groove in the supporting roller. Such movement of the auxiliary control belt inwardly along the inclined side ofthe groove cams it laterally and the lateral movement is transmitted by the frictional engagement of its .outer periphery with the belt to be controlled to, in turn,

i 'ment into its groove, the greater willfbe the frictional forcebetween the belts and the radial force on the control belt causing it to bejammed into its groove and to l bodily shift the main belt laterally. Thus, all of the force required to control the belt is supplied from the l belt itself without increasing the power required to drive the belt.

` Referring now to the drawings, an apparatus for carrying out the method of the present invention isshown ap- .pliedA to an artiticialski slope 12. Asshown in FIGURES l and V2, the ski slope comprisesan inclined deck 13 having;

pulley rollers

14 and 15 at the top and bottom and a continuous belt 16 vsupported by the rollers and movable upcthe surface 'of theinclined deck. Deck 13 is supported from a iioor 17 by spaced stanchions 18, 1li-a, llb and 18C and the upper roller 14 is driven from a combined motor ,and variable speed transmission 19 through a belt 2b. y Roller-14 drives the upper course of the belt 16 upy wardly over the top of the deck 13 and the roller has friction strips 25 between it and the belt. The lower course of belt ltunderlies the deck and is supported by rollers 21 and 21a on the stanchions 1S.

Horizontal platforms

22 and 23 are provided at the upper and lower ends of the deck 13 and the ski slope has side rails 24, only one being vshown in FIGURE 1,"at the sides ofthe moving belt 16.

Vplate is the upper course of belt 16. The beams 29 and fill are supported by the stanchions 18 andthe latter are cross braced to'provide a rigid structure. Belt 16 comprises a material having a low'coefhcient of friction, such as nylon pile fabric, so that it slides -Ielative to the skis The deck may be inclined at an angle of,for example 11 to the horizontal and may l be driven at a. speed of, for example nine miles per hour.

y,In accordance with the present invention the con-trol means Vcomprises at least .one auxiliary control belt 35 .between the main belt 16 and a lgroove 36 inV one of the.

rollers

14 and 15 supporting the belt. The outer periphery of the auxiliarycontrol belt 35 frictionally engages the lbeltld to be controlled so that it, in effect, forms a dependingrib on the main belt, but without rigid attachone direction or the other by the inclined sides of the groove 36 depending upon its angular direction with respect to its path of movement of the belt to be controlled. The direction of movement of the auxiliary control belt 3S, in turn, is changed in response to any lateral movement of the main belt to guide the auxiliary control belt at the desired angle to the path of movement of the main belt 16. Thus, immediately upon any lateral movement of the belt 1o the auxiliary control belt 35 is adjusted so as to advance at an angle to the direction of movement of the main belt which is opposite to the direction in which the main belt tends to drift. The angular movement of the control belt then bodily moves the main belt to a corrective position by the ritcional engagement of the two belts. ln the illustrated embodiment a plurality of the auxiliary belts 35 are provided with corresponding grooves 36 in the supporting roller 14.

As shown more in detail in FGURES 3 :to 9, the

grooves

36 and 36a in the periphery of the lower roller 15 are V-shaped with a relatively wide angle of slope. The sides of the grooves 36 are inclined inwardly toward each other and have a smooth anti-friction surface. Preferably, the sides of the grooves 36 are lined With an anti-friction material 37, such as Tetlon, to otter a minimum resistance to the sliding movement of the sides of the belt as it seats in a groove. The

rollers

14 and 15 may be formed of pipe sections with the grooves 36 formed in the wall of the roller 15, or a thin walled tube may be built-up with a wrapping into which the grooves are cut, or cylindrical sections may be slid into position over the outer periphery of the pipe sections and welded thereto with the sections being so shaped as to form the grooves. As shown in FIGURES 3 to 5, the

hollow rollers

14 and 15 `have discs 38 welded therein and mounting axles 39 vat its opposite ends.

The auxidary control belts 35 are of a narrow V-shaped form in cross-section so that the inclined sides cooperate with the smooth sides il@ and 41 of the groove 36 and have a peripheral friction surface 42 see FIGURE 7.

rl`he auxiliary control belts 3S are in the form of a continuous loop which is captured between the main belt 16 and groove 36 in the supporting roller 15. Each auxiliary belt 35 is driven by the main belt lo, due to the frictional engagement of its periphery 42 therewith, and is jammed into its respective groove 36 by the force of the surrounding belt 16, but the smooth sides 4Q and 41 of the groove 36 cause the sides of the auxiliary belt to freely slide into and seat in the groove. When the main belt 16 is tracking properly each auxiliary control belt 3S moves into its groove 36 parallel to the direction of movement of the main belt, as shown in FIGURE 3. However, the auxiliary control belts 3S may be actuated in unison to move at an angle to the direction of movement to the main belt, as shown in FIGURE 4. When an auxiliary con-trol belt d5 is directed toward its groove 36 in an angular direction from the left toward the right, as shown in FIGURE 5, it is jammed into its groove 36 and is cammed to the right to bodily shift the main belt 16 to the right. FIGURE 6 illustrates the manner in which the main belt 16 is shifted toward the lett when the auxiliary control belt is directed toward its groove 36 from the right toward the left in an angular direction to the path of movement of the main belt.

FlGURE 2 illustrates the manner in which one or a plurality of auxiliary control belts 35 are guided to control the angular direction in which they move toward their respective grooves 36. In the illustrated embodiment the guide means for guiding the auxiliary control belts '35 comprises a grooved pulley 45 for each control belt 3S, but other forms of guides may be used. Each pulley 45 ismounted to rotate and is engaged by an auxiliary control belt. The plurality of grooved pulleys l5 and 45a for the auxiliary belts l5 and 45a are connected together for movement as a unit by a connecting bar 46. Bar 46, in turn, has depending

feelers

47 and 48 at its opposite of the belt 16 to be controlled. Thus, any lateral movement of the belt 16 in either direction is transmitted to the bar 46 which moves the

pulleys

45 and 45a in the same direction that the belt tends to drift. Such movement of the

pulleys

45 and 45a then directs the auxiliary control belt 35 at an angle to the direction of movement to the belt 16 and in a direction opposite the direction which the main belt tends to drift. Thus, the auxiliary control belts 35 depend from themain belt 16 at an angle to the direction of movement of the main belt and are cammed laterally by the grooves 36 in the roller 15 to bodily move both belts laterally due to their frictional engagement.

Guide pulleys 45, bar 46 and

feelers

47 and 48 may be mounted in any suitable manner for operation by any suitable sensing mechanisms. In a preferred form of construction illustrated in FIGURES 8 to l2, the guide pulleys'45, 45a, etc. are mounted on a transverse frame plate 50 extending between beams 29 and 30 below the deck 13. As shown most clearly in FIGURES 8 and 12, each grooved guide pulley 45 is mounted at the lower end of a depending arm 51 pivotally mounted at its upper end on a pin 52 projecting forwardly from a bracket 53 on the horizontal frame plate 50. The lower end of the depending arm 51 is bifurcated to form a fork having side arms 54 and 55 straddling its pulley 45 and mounting a pivot pin 56 on which the pulley rotates. Each arm 51 has a pivot pin 57 projecting from one side on which a cross head 5S pivots. The cross heads 5S for the plurality of arms 51 are connected by the bar 46 extending through the cross heads and attached thereto by set screws59. Thus, when the bar`46 moves laterally in one direction it acts through the pins 57 to swing the arms 51 on pivots 52 and move the groove pulleys 45 in unison to one side or the other. i

The

feelers

47 and 48 at opposite ends of the bar 46 each comprises a pair of

rollers

62 and 63, as shown in FIGURES 8 and ll. The

rollers

62 and 63 are mounted to 'rotate on and depend vertically from a'plate 64, and

the plate is attached to the lower end` of a swinging arm Vviewed in FIGURE 2, itmoves the guide pulleys 45 and a to the left and thereby directs the auxiliary control belt toward its groove 36 from the left toward the right to move the belt backto its proper tracking position. If,

- on the other hand, the fve'eler`43 is moved to the right the bar 46 and guide pulleys .45..aremoved to the right to directthecontrol belts.35 toward the grooves 36 at an anglefrom right to. left to correct the direction of movement of the main belt.'` One form of construction having vnow been describedl in Vdetail,'1the mode of operation is next explained. y Assuming for the purpose of description that the ski slope 12 is in operation with the belt 16 being driven by the motor 19 through belt Ztl andfupper roller 14 and that a person is skiing on the moving belt. If the upper course of the belt 16mm/es laterally at any time dur- Such movement ofthe bar 46 is transically in an angular directionv from the left toward the right.

As shown most clearly in FIGURE 8, each guide pulley 45 is located to position the outer periphery ofv the auxiliarycontrol belt 35 in contact with or closely adjacent the inside of the lower course of the main belt 16 to-be controlled. Thus, as the auxiliary control belt 35 moves toward its groove 36 in roller 15 its outer periphery frictionally engages the main belt 16 to form a projecting rib extending at an angle to its rdirection of movement. As the wrap of each auxiliary guide belt 35 is located in its groove 36, the angular portion approaching the groove tends to move in a straight line and ride up on the left hand side of the groove. However, the auxiliary guide belt 35 immediately slides down the smooth side di of the groove as it is jammed into the groove by the surrounding wrap of the main belt 16. The belt16 to be controlied is much larger and heavier than the auxiliary control beit 35 so that it jams the auxiliary belt into the groove, and as the periphery of the auxiliary control belt is in tight frictional contact with the outer beit the inclined side of the groove 36 cams both belts to the right as a unit in the manner illustrated in FIGURE 5. In some instances the corrective shifting ofthe main belt i6 may occur between the guide pulley 45 and roller v15 and in other instances thecorrective shift of the belt may occur only at the wrapped portion of the auxiliary control belt 315 as it seats in its groove 36. In either case, the auxiliary guide belt 35 bodily moves the main belt 16 in the opposite direction, or to the right,

from the direction in which it tends to drift.

Such correcive movement of the main'belt 16 then runs throughV the uppercourse and lower course and actuatcs the feeier 43 to move the bar 46 in thefopposite direcz tion or to the right as viewed in FIGURE 2. Such movement of thebar is transmitted through the depending arms Si and guide pulleys 45 to move them blaclt` into ya pathy parallel to the direction of movement of the main belt, as illustrated in FIGURES 2 and 3. When the main belt 16 and auxiliary control belts 35 'move parallel to the direction of the main belt the auxiliary control belts tend to hold the main belt in a straight path.

If the main belt 16, tends to drift in the opposite direction, or to the right as viewed in FIGURE 2, the feeler Zidis actuated laterally to the right and moves the guide pulleys y 45 to the right todirect 'the auxiliary guide belts ,angularly to the direction of movement of thel main belt from right to left. Suchfan angular relationof the auxiliary control beltsy 45 then cooperate `with the main ing operation'the lateral movement is transmitted tothe lower course so` that the edge of the beit actuates feel'er 47 or 48'v laterally as, for example, to the left, as shown in FIGURE 5. Fceler 47 tast on bar 46,1noves the latter When guide pulleys 45 are pulled to theleft they direct the auxiliary control belts 35 atan angie tothe direction of movement of the belt i6 totbe controlled and more specifbelt le and' `grooves 36 in the manner previously 1described to bodily shift the mainbelttoward the left to 'correct the'driit'of the main belt. Following such cor-1V Yrective movement theauxiliary control belts are -mnved back into parallelA relation with themain'belt to be con# trotted?, e 'Y ,-1 It will nowb'e observedthat the'.presentinventionprovides an improved apparatus for maintaining Yacontinuvous web a"substantially straight path'by utilizing the energy otr'the webitself to provide the force required to change its direction of movement.' `It also will'be `ob'fl p served thatthe present invention provides an improved apparatus for maintaining the alignment of a relatively wide belt by directingran auxiliary control belt between it and a groove in a supporting roller in a direction'opposite the direction that the belt to be controlled tends ,todrift Y Y lt will further be observed thatthe present inventionprovides an Yimproved apparatus 'for tracking 'the moving belt of anv artificial ski slope Whichutilizesvany lateral movestruction, economical to manufacture and one which is reliable in performing its intended function.

While a single embodiment of the invention is herein illustrated and described, it will be understood that changes may be made in the construction and arrange* ment of elements without departing from the spirit or scope of the invention. Therefore, without limitation in this respect, the invention is defined by the following claims.

l claim: l

lfApparatus for controlling a continuous web cornprising a roller in contact with the web and having at least one groove therein with smooth sides inclined inwardly towards each other, an `auxilary belt mounted for movement between the web and groove in the roller, said belt having opposite sides adapted to contact and slide on the smooth sides of the groove and a friction surface at its outer periphery for frictional Contact with the web to be controlled, and a guide spaced from the auxiliary belt having opposite sides adapted to contact and slide inwardly on the smooth sides of the groove and a friction surface at its outer periphery for frictional contact with the web to be controlled, a belt guide spaced from the roller, .and means responsive to the lateral movei i ment of the continuous web and connected to the belt guide for moving the latter laterally in the same direction astheweb. Y Y

3. Apparatus for vcontrolling a wide continuous belt supported at one end by a roller, said roller having at least one V-shaped groove therein with smooth sides, a V-shaped control belt between said wide belt to be controlled yand groove Vini the supporting roller, the inclined sides of said Vtl-shaped controlV belt being adapted to slide downwardly on the inclined sides of the V-shaped grooves Vin the roller and said control belt having a'. friction survface at its Vperiphery to frictionally Vgrip the belt to be controlled, a guide pulley for said control belt having a V-shaped groove and, mounted` to move laterally, and means connected to the guide. pulleyrand responsive to lateral movement of the wide belt Yto be controlled forV moving the guiderpulley in the same direction whereby to, move the wide belt to be controlled in theropposite .direction by the friction grip between itl and the control` belt as the latter moves toward andinto the groove iny the roller.

. VV'4. In an apparatus for simulating aislci'islope"c o'rnprisingan inclined deck having. rollers at theftop and bottom,

a wide belt of a material having a lowcoelcient of fric-v .tion andprirne mover'means for drivingone ofthe rollers to causefthe VWide belt to move upwardly along the topof the deck, the combination with said apparatus of belt aligning means for maintaining the wide belt in a substantially straight path comprising a il-shaped groove in one of the rollers, an auxiliary tf-belt between the wide belt and groove in the roller, said groove and auxiliary control belt having relatively smooth sides to adapt the auxiliary belt to slide downwardly into the groove and said auxiliary belt having a friction surface at its periphery, and a guide spaced from the groove in the roller for directing the auxiliary control belt toward the groove in the same and opposite angular directions to the path of movement of the wide belt to be controlled, and means responsive to lateral movement of the wide belt for moving the auxiliary belt guide guide laterally relative to the V-groove in the roller.

5. An apparatus in accordance with claim 4 in which the upper roller is driven from said prime mover to drive the wide belt and the lower roller is driven by the belt, the V-shaped groove being provided in the lower roller, and the auxiliary control belt being driven by the frictional engagement of its periphery with the moving belt to be controlled so that the latter provides l'the force required to change its lateral direction of movement.

6. An apparatus in accordance with claim 4 in which the sides of the grooves are covered with an anti-friction material whereby to adapt the auxiliary control belt to slide freely into the groove .as it moves toward the groove at an angle to the path of movement to the main belt and thereby move the main belt in the same direction by its frictional engagement therewith.

7. An apparatus in accordance with claim 4 in which the guide is a pulley having a V-shaped groove, means for mounting the pulley for movement laterally, and said means for moving the guide pulley being connected to move the pulley in the same direction as the main belt tends to drift.

8. An apparatus in accordance with claim 7 in which a bar is mounted to slide laterally, means connecting the guide pulley to the bar for lateral movement therewith, and said means responsive to the lateral movement of the guide belt comprising guide rolls at each end of :the bar and contacting opposite edges of the Wide belt to be controlled. i

9. An apparatus in accordance with claim 4 in which the supporting roller for the wide belt is provided with a plurality of spaced V-shaped grooves, an auxiliary control `beltrfor each of the grooves, and the means responsive to lateral movement of the'wide belt comprising a control bar mounted to move laterally, said bar having a guide for each control belt, and said means responsive to lateral movement of the wide belt being connected4 to move the control bar inthe same direction.

References Cited in the tile of this patent

Claims

1. APPARATUS FOR CONTROLLING A CONTINUOUS WEB COMPRISING A ROLLER IN CONTACT WITH THE WEB AND HAVING AT LEAST ONE GROOVE THEREIN WITH SMOOTH SIDES INCLINED INWARDLY TOWARDS EACH OTHER, AN AUXILIARY BELT MOUNTED FOR MOVEMENT BETWEEN THE WEB AND GROOVE IN THE ROLLER, SAID BELT HAVING OPPOSITE SIDES ADAPTED TO CONTACT AND SLIDE ON THE SMOOTH SIDES OF THE GROOVE AND A FRICTION