US2639868A - Strip material winding apparatus - Google Patents

Description

y 6, 1953 1.. A. TROFIMOV- 2,639,868

STRIP MATERIAL WINDING APPARATUS Filed Nov. 29, 1951 2 Sheets-Sheet l 1'04 i I05w IN VEN TOR.

Lel/ 7/ 0/7 7 M y 1-953 'A. TROFIMOV 2,639,868

STRIP MATERIAL WINDING APPARATUS V Filed Nov; 29, 1951 I v 2 neeis-snerz I INVENTOIIITII v Lez iimQvqr 147' TOENE Y.

Patented May 26, 1953 UNITED STATES PATENT OFFICE 2,639,868- A A STRIP MATERIAL WINDINGAPPABATI IS' Lev A. Trofimov, Willoug hby,

Application November 29, 1951, Serial No. 258. 904

16 Claims.

This invention relates to winding apparatus for Winding strip material on a drum or the like;

' The invention is particularly applicable to unwinding strip material from a coil on a supply drum or the like, and rewinding it in a coil on another drum or the like, and will hereinafter be described as applied to that use.

There are well known uses for such apparatus in various industrial arts.

Apparatus of this class has been proposed heretofore; but problems have arisen which have not been satisfactorily solved by such prior apparatus.

Among such problems has been that of maintaining a desired tension in the strip being wound and a desired speed of winding, the problem originating in the increasing diameter of the roll as winding goes on.

It is desirable for a single apparatus to be usable to rewind various different kinds of material at different times. Some materials dictate a low speed, whereas others may advantageously be wound at high speed; andsome materials require high tension in the strip being rewound, and such tension in strips of other materials cannot be permitted.

In some prior apparatus of this class, adjustments of strip speed and tension have been proposed, but the provision of adjustments that can be accurately and sensitively made and that will thereafter remain fixed, particularly adjustments of strip tension and speed independently of each other, whereby any desired tension maybe had at any desired speed and over wide ranges of tension and speed, has not been satisfactorily accomplished in prior apparatus.

It is an object of the present invention to provide an apparatus of the class referred to which overcomes the foregoing and other objections to prior apparatus.

Another object is to provide a strip winding apparatus having improved means for adjusting the strip speed, and for maintaining it constant.

Another object is to provide a strip winding apparatus having improved means for adjusting the strip tension and for maintaining it constant.

Another object is to provide a strip winding apparatus having improved means for adjusting the speed and tension of strip material being wound, either one alone and independently of the other, or both concurrently.

Another object is to provide improved power means for driving the-winding drum of a strip Winding apparatus.

Another object is tov provide improved means fortensioning strip material while being Wound.

Another object is. to provide improved means for automatically controllingwthe tension of strip materialbeing wound,'.responsive to speed ofthe strip..- I

"Another object is toprovide, in a strip winding apparatus, strip speed-controlling means comprising improved .adjustable speed-reference means.

With these objects in view, and. others that will occur to. those skilled inthe art which will become apparent hereinafter, the apparatus in an illustrative embodiment of the. invention and to be described in detail, comprisesgenerally speaking, the following parts.

A power. unit drives. a: winding-drum to wind strip. thereon, drawing. it from a supply drum on which it has been previously wound. The power unit is of a type that has such torque-speed'characteristics' that if its output torque rises, its output speed falls; and vice versa; so that general, when the delivered torque is high, the speed is low, and vice versa; and the unit will deliver torque over a widerange from maximum torque at zero speed to substantially zero torque at maximum speed. For any delivered output torque the outer circumference of the coil being wound,

so that regardless of increase of diameter of the coil as winding goes .on, if constant torque is applied to the coil, it is converted into constant tangential pull longitudinally of the strip material as it'approaches the winding drum.

This pull or longitudinal force'on the strip reacts upon the unwinding drum from which the material is being drawn, and rotates it; and the rotation of the unwinding drum is retarded by a braking apparatus; and it is by this means that torqueoutput of the power unit produces tension in the strip.'-

Strip speed responsive apparatus is provided actuated by the speed of'the strip to vary the braking action on the unwinding drum, tending to increase the. braking action upon an increase of strip speed and decrease it upon a decrease of strip speed.

A speed-reference power unit isprovided having'a fixed output speed which can be preset by adjustment at any. desired-fixedspeed.

- The braking action on thewound drum produced by the. braking apparatus, responds jointly tothebconstant set speed :of. the speed reference unit and to the speed of the strip, whereby the strip speed is maintained constant, and the value of the constant speed can be selectively adjusted.

With the speed reference unit adjusted for strip speed of some selected constant value, the torque of the power unit corresponding to that speed will develop constant tension in the strip of a corresponding value. Upon adjusting the power unit to change its torque output at that speed, the-tension inthe' strip-may be adjusted without changing its speed; whereby for any chosen speed of winding, the strip may be wound with any desired tension. And by adjusting both the speed reference unit and 'the torque of'the power unit, the strip may be wound at any desired speed and any desired tension; whereby, a; given apparatus may be adjusted to'wind-at 'low strip speed and high tension, or high strip speed and low tension, or at any intermediate values of speed and tension, over a wide range of speed and te'nsion; to adapttheappa'ratus to the requirements of diiferentmateria'ls.

- The adjustment means of thespeed reference unit and that of the power unit are interconnec't'edso that the strip can 'be' woundat a preselectedtension atone-speed and then the speed changed without changing" the tension.

' The invention is described generally in the foregoing andan embodiment thereof will be described in detailybut the: actual invention is that set forth in the appendedclaims.

The said =preferred embodiment is fully disclosed in the followingdescription taken with the accompanying drawing in which:

Fig. 1-'is a view-illustrating somewhat diagrammatically the said embodiment of'the invention;

Fig. 21s a fragmentary view'of a part of Fig. 1, illustrating a modification;

'Fig. 3 is'a'fragmentaryview of a part of Fig. 1 illustrating a different application of the invention.

The diagrammatic drawing-illustrates rotary gears,- shafts'etc but the bearings therefor have heed-omittedforfisimplification; :and as being known: and understood.

There 'is' shown' at" I a'drum rotatably supported-'=on= a shaft" Z and 'havi-ng'acoil 3 of strip material 4"wound 'thereon; the stripe leaving the coil tangentially'and going over a cylindrical roll 5 ona'sh'aft fi, then-betweenthe roll 5 and a roll l-"on a shaft 8; and between the roll I and a roll 9; and-therebeyond as shownis being wound in'a coil lfl'ona' winding drum I l.

r The roll 9 is supported by a shaft l2, and the rolls 5 and Tare maintaineddn'vertical alignment by guides not shown, and are held downwardly by gravity or by=spring means I3 or other suitable means notshown but well known; and thereby the strip 4 is gripped between the rolls 5--'! and 1-9.

By this means when the strip 4 is being wound on-thedrum H and moves linearly through the rolls, it drives the roll 9, and is prevented from slipping thereon and" thereby drives'the shaft l2, always at a speed corresponding to the linear speed'of the strip 4.

-The coil 80 at i-ts outside perimeterrests by gravity upon a pair of spaced cylindrical rolls, l4l5 of equal diameter, mounted on 'shafts l6--|l. "The roll '14- is driven directly by power supplied to the shaft l6; and by means of like gears l8'l9 on'theshafts lG- -l'l meshed with anintermediate gearZB, the .roll' is driven; and therefore both' rolls" l4'l5 'are'driven at the same'speed and in the same direction;' and the 4 rolls M-l5 rotatably drive the coil I 0 by frictional contact with its periphery.

The rolls M and I5 are part of a driving powerunit shown generally at A and comprising a motor 2 I, running continuously at substantially constant speed, a squirrel cage induction motor as shown being preferred; and comprising a differential gear transmission indicated generally at B, transmitting motor power to the shaft [6.

'-'-The transmission B comprises tWddifierentiaI gearings C and D; preferably alike. The gearing C comprises a spider gear element 23, rotatably supporting pinion gears 242'4, meshed with two differential gears 25 and 2 6.

The gearing D comprises a spider gear element -21, rotatably "supporting pinions 28-48, meshed with two differential gears 29 and 30.

A shaft 31 connects a gear 32 to the differential gear25; a shaft 33 connects the differential gear 29 to a gear 34; and the' two gears 32 and 34 are meshedwithan intermediate gear. 35 on -.-the shaftl6.

The two-spider elements 23 and 2'! are preferablyof the same diameter, and. have teeth on their 'per-imeters, meshed together at 36; and a pinion 3l on a shaft38 of the motor 2| meshed with the spider element 21; whereby the motor drives bothspiden elements 21 -23, in opposite directions at the same speed.

The differential gears 2630 are connected re spectively by --shafts 39- 40 .to electrodynamic units ll-42 having the constructionof direct current generators.

Thegeneratorshave a local closed series load circuit connected to their brushes, comprising wires 43-44.

The generators Mfi2 are preferably alike and have separatelyexcited field windings 45- 46 respectively .energized -at the same polarity from direct current mains 41-48, through 'rheostats 49 5El; .thepath. of the current for the field winding 46 being from the main 47, through a movable rotary contact; 5| ofthe rheostat 49 and a part of its resistor 52 by wire 53 "through a rotary contact'5 i of 'the rheostat 50 and part of its resistor 55, by wire 56 through field winding 46 and back by wire 5'! to the main '48; and the current path for the field winding l5-being from the main 4'! as before-to the contact 54 of rheostat 5D and part of its resistor 55,'then by wire'58, through field winding 45 and back by Wire 59 to themain 48.

'At E .is a differentialv gearing, comprising a spider element 60, rotatably supporting pinions 5|'-6l, meshed with d'iiferential gears 6253, the differentialgear 62 being connected to the shaft l2 and driven thereby.

The spider element'fi!) has peripheral teeth meshed with a gear 64 on a shaft 65 connected to a gear 56 meshed with a gear 51 connected to a sh'aftpfi; and rotation of "thespider element fill thus drives the shaft68.

At F is a "brake mechanism for the wound drum I, comprising a brake drum"69 on the shaft 2, a brake shoe 78 held against the brake drum l9 bya pivoted'armll and a spring l2 between the arm and the brake shoe; and a cam 13-011 the shaft 68, upon alternaterotation' thereof, rocks the arm'll to produce variable'braking effect onthe drum 69 by the shoe'lll.

At G is shown generally a speed reference unit. It comprises "a differential gearing H having a spider element 14, rotatably supporting pinions l5, meshed with differential gears Hi-"l7; "and comprises-a variable speed transmission unit shown generally at I' comprising apair of parallelshafts '18-'49 having expansible" and contractable belt pulleys 808|'splined thereto connected by a-belt 82, and operable to beoppositely'contractedand expanded axially, by rocking levers 83 -84 pivot ally supported at 85-85 and engaging the pulleys 808| on opposite sides ofthe pivots; the levers 8384 extending beyond' the pulley 80 andengaged with threaded nuts Bf-88 "on a'screw 89 having right hand and lefthand threads till-9|; whereby upon rotation of the screw 89, the nuts 81-88 will be propelled oppositely along the screw, and the levers 83-84 will be oppositely rocked, and expand the diameter of one of the pulleys 80'8| and contract that of the other, to change their-relative diameters and speed ratio. A powerinput motor 82, preferably onethat runs at substantiallyconstant speed, a squirrel cage induction motor being preferred, is connected to the shaft 18, through gears 9394.

The motor 92 runs continuously, rotating the shaft 18 at substantially constant speed and, by the belt 62, drives the shaft 19 at different speeds corresponding to the relative diameters of the pulleys 808|. The screw 89 is rotatable in alternate directions as referred to by a reversible adjusting motor-95 connected to it through gears 969|..- Any-suite able motor and reversing control therefor may be provided, that shown comprising a. squirrelcage induction motor 95, connected to supply mains 9899|00, by wires |.0|-|02-.|03 through forward and reverse push -button.contactors .IM and H15. Normally the contactors I04 and I05 are open and the motor 95 at rest. Upon closing one contactor the' motor ,93 starts, and runs'in one direction and upon closing the othenit runs in the other direction, the electrical reversing connections shown being conventional, and not require ing description in detail. v

The spider element 14 of the difierentialgeare ing H is connected to the shaft .18, and the differential gear 11 is connected toachain sprocket Wheel I06; and the shaft 19 has a sprocketwheel I01 connected thereto, aligned withthe sprocket wheel H16, and .a sprocket chain I08 connects the two sprocket wheels, lllfiand |0|-.-, v.

The part of the variable speed transmission shown at I will be recognized as one of the Reeves? type; but such atransmission has been chosen for illustrative purposes, only; and as such is not an essential partof the invention; and it will be understood that anywQther type of variable-speed-ratio transmission may be used with which the mechanical. connections to thedifferential gearing E canbe made and which hasa rotary speed ratio adjusting element correspond:

ing to the screw 89.

The screw 89 has a gear I09 thereon meshed with a gear ||0 connected to one end of a. rotary shaft III, the other end of'w'hich is connected to the rotary contact 5| of the rheostat 49.

The operation of the above described apparatus will now be given.

As to the transmission part B, ofthe: power unit A, a general description of such apparatus as a reversing power unit may be found in the'patent of Lev A. Trofimov, Number 2,464,275, issued March 15, 1949; and in view of that patent a brief description'will suflice here, althoughhere the direction of the torque output lis'alwayfs in For'purposes of description it will here'be first assumed that i'thecontabt is on some midpoint of theresi'stor 55, and that the two field windings are equally energized, or at least energized relatively to cause the generators 4'|'42 to'produce equal output voltages when drivenat the same speed.

Preferably the twodiiferential gearings C and D are alike as to size ofgears etc. The spider 23 applies'equaltorques to the gear '32and to the generator 4|; and the' spider 21 applies the same equal torquesto the geari34 and the generator 421 The gears 32 and 34 tend to be driven in opposite directions, and, being subjected to equal torques and both meshed with the gear 35; they 'apply their equal torques to the gear 35in opposite directions, and are held from rotating thereby; and the generators 4|42 therefore will be driven, and in opposite'directions and at twice the speed of the spiders 232|. Thegenerators 4|'42,-generate opposite equal voltages in the loadcircuit 43-44, and therefore no load'current flows; and all torques are therefore negligibly small,"in theseassumed idling conditions.

If now, more-as in practice,'the contact 54 be rotated from' its assumed mid-position; clockwise, as viewed in the drawing, energization of the field winding 45 will be increased and that of winding 46 decreased} the voltage of the generator 4| "will: exceed that'of generator 42; and

load current will flow from generator 4| in the load circuit 43 -44 through the generator 42,

causing it to act as a motor.

The generator 4|, now being loaded, requires more torque to drive it, and'it takes this increased torque from the spider 23, and an equal increased torque is developed on'thegear 32',

tending to drive it in the same direction as the 30 causes it to react on the spider 21 and applythe torque to difierential gear 29 and gear 34 in the direction opposite to that'of the assumed idlingconditions, thus tending to drive the gear 34 in the same direction as the gear 32. The torque of gears :32 and. 34 are thus applied to the gear 35 both in the same direction and the gear 35 and the shaft l6 are rotatably driven thereby; and, as described, the coil I0 is thereby driven in the winding"direction by the shaft It.

From the foregoing it will beseen that if the output shaft" I6 be at rest or rotating at low speed, the generator and motor speeds will be high and the'torque applied to the shaft |6 will be high; and that at higher and higher speeds of the output shaft I6, the torque applied to it will be correspondingly less and less; this being the output torquespeed characteristic of the unit A.

For each certain speed of the shaft l6 therefore itdeuvers a' corresponding certain torque; and the actual value ofthe-delivered certain torque may be changed by changing the posi tion of the rotary contact 54.

Current to the field windings 45-45, at any setting of the'contact '54, iiows'to the contact 5| and through part-of theresistance 52, of

rheostat 49. If the contact'5l be moved to cut out some of ther'sistance 52 it will increase the field strength of generator 4l' 'and increase "its assesses? generated load .tcurrent and the torque Thor-drive it, and hence increase the torque on shaft 16* as described: The. torque-speed characteristic above described willnot be changed-thereby, but all 'values of delivered torque will be increased.

Thus as will be apparent. from 'theforegoing, the torque of output shaft 16 maybe-kept at a constant value for different certain speeds by movement of contact 54; and the actual amount of said:constant torque-value at such "spe'eds'can be changed by moving contacti I Assuming now that, as in practice,=the power unit- A is running and that the rheostat ill) is adjusted'asadescribed to cause-the shaft It to. apply'torque to the coil lifl through the 'rolls' I4-'-I5 to drive it; the strip 4 will be'drawn'from'. the coil 3, and-will drive the roll 9 and'thereby shaft I2 and differential gear: $2 of gearing E.

The gear 62 reacting on'the differential gear I53 will drive the spider .BILand, through the 73 of the brake mechanism Finthe direction to exert more braking action .on the brake drum 68';

Inthe absence of'any corrective provision; this would slow down the strip speed more and more, and slow downthe drive shaft I6 at the unitA more andmore and cause the torquev at shaft It to rise more and more and develop continuously increasing tension in the strip 4.

However, in practice, the unit'G is also in operation, being driventby the motor '92. The shaft 18 thereof :rotates the spider 14 of the gearing H; directly, androtates the differential" gear 'I'! at a speed determined by'the rotated position of the screw 89 of. the unit I; so that'thedifferential-gear T6 of the 'gearing- H has a corresponding rotary speedgaand it rotates'the differential' gear iit ofthe gearing E in the direction opposite to that'of thediiferential gear 62 driven by the strip 4.

The speed of difierential gear 76 may be ad justably changed by changing the speed of gear I! andv this is done by rotating the screw 89- of the unit I bymomentarily closing either the con tactor IE4 or the contactor I95; and thereby the speed of differential gear I6 and 63 :connected together, maybe increased or decreased. This may be considered as a pre-set adjustment, and

when the speedof the difierentia-lgear '62, of the unit E is equal'to the speed of the gear-63',

the spider' 6! will cease to rotate and the brakeaction will stop changing, and thus: a constant adjusted or pre-set speed "of Ithe' strip will be maintained.

Whenwvinding of the strip begins, a desired speed and tension for the-strip may be chosen.

The power unit A by its output shaft It, draws the strip G from the-coil 3, and-produces tension in the strip due to the said braking action. The speed of the strip may be adjusted as described to the chosen value. at that speed maybe adjusted to the chosen value by adjusting the rheostat 50, and the strip will then have the chosen speed at the chosen tension.

If now it be desired to change the speed of the The tension in-the strip strip without changing the strip tension, this is provided for as follows.

When the unit I is adjusted, by rotating the screw 89, say to increase the speed of the strip 4 it increasesthe speed of differential gear 16 and S3, and the spider fiil rotates and'this turns the camlt in the direction to reduce the brake action of the brake unit F to allow the strip to have a greater constant-speed;

, characteristic.

8%. In theabsence of other provisions, this in= crease of strip speed wouldcause the output shaft l6 of power unit A: to increase in speed, and its torque to fall, because'zof the said torque-speed for, by turningv therheostat 49 to increase the torqueas described. For convenience, the contact 5| "of rheostat 59 may be connected by a shaft III and gears Nil-I09 to the adjusting:

screw 89 so that turning the screw 89 to increase the strip speed also adjusts the rheostat 49 to restore the torque or maintain it and maintain the striptension;

Knowing the speed-torquecharacteristic of the power unit A, and the change of strip speed for each'turn of the screw 89, the ratio of the gears lIl9-'IIII and the resistance of the resistor 52' per unit of length is readily predetermined so' that rotation of the screw'89 by an increment to increase the strip speed as aforesaid, is accompanied by a concurrent compensating increment of movement'of the contact 5i in the torque increasing direction; which results in maintaining the torque without change at the increased strip speed; and the unchanged torque results in unchanged or constant strip tension; and this obtains throughout the winding operation, and throughout the-increase of diameter of the coil because the'torque is always'applied tangentially to the coil.

If now it be desired'to change the strip tension at any adjusted strip speed, without changing the speed, the rheostat 50 is adjusted by rotating the contact 54in one direction or the other, which, as explained above, due' to the torque-speed characteristic, changes the torque of the output shaft I6.

If, for example, the torque of the shaft It be increased in this manner, it tends momentarily to increase the. speed of the strip 4; but any increase of strip speed will increase the speed of the roll 9, shaft I2 and differential gear 62. Differential gear 63 is running at a fixed speed determined by adjustment of the unit I; so that .-now thespider 60 is rotated b the di'fierence be adjusted to any desired speed, and for all strip speeds, the strip tension will remain constant; but the strip tension can be adjusted at any speed by the rheostat 50.

A wide range of strip speed adjustment is :provided by the unit G, because the speed of the differential gear '11 can be changed to any speed from zero to a high speed. by adjustment of the speed ratio of the belt pulleys 3il8lthrough a practical range of only 4 to l.

the rheostat 50. 1

In Fig. 2 is illustrated, another means, or modification, for braking or resisting rotation ofthe supply coil 3 for the described purposes.

J and K constitute a transmission, and are part of a braking unit indicated generally at-M;

The gearing J comprises a spider element H2 rotatably supporting pinions I I3'II'3 meshed with fldifierential gears, :l I 4-4 15. The gearing K That .can then be compensatedv A wide range of tensions is also provided by.-

Two difierential gearings indicated generally atcomprises a spider element H6 rotatably supporting pinions II'I I I'I meshed with differential gears II8-I I 3. The spider elements I I2 I I6 have peripheral teeth meshed at 'I20. The gears II4 and IIS are connected respectively to gears I2I and I22, both meshed with a gear I23 connected to the shaft2 pf the strip supply drum ,I. I i The gears I I and II9 are connected respectively to units I24-I25 constructed like direct current generators or motors and at this point the unit I24 will be considered as a generator, and the unit I25 as a motor. The generator I24 has a closed local series load circuit connected to its brushes, comprising Wires I26 I2'I. The generator I24 may generate current in the load circuit which includes the motor I25 in series to drive it. I

The generators I24 and motor I25 have separately excited field windings I28-I 29 respectively energized from direct current mains I30--I3I, through a potentiometer type rheostat I32, comprising a resistor I34 and a rotary contact I33. Current from the main,|30 goes to the rotary contact I33, and there divides, and part going through one side of a resistor I34 of the rheostat, by wire I35, to the field winding I28, thence by wire I36, to the main I3I; and the other part going through the other side of the resistor I34, by wire I31, to the field winding I29, and thence by wire I38, to the main I3 I. The rotary contact I33 is connected to the spider Bfl of gearing E through shaft I39, and gears 61, 65,- 64.

For some midpoint of the contact I33, the

two fields I20I29 are equal, or balanced, to

cause the units I24- 425 to develop equal potenv tials, and at otherpoints the voltage of one is greater than that of the other. i

'The shaft I2 goesfrom the roll 9 to the differential gearingE, asit does in Fig. 1 and drives the differential gear 62 thereof as in Fig, 1; the spider 60, and the gears BI to 6'I all being reproduced from Fig. 1, I

A motor I40, preferably a squirrel Cage induction motor as shown is mechanically connected to the spider IIB by a pinion IIII driven by the motor I40 and meshed with the spider, and is electrically connected to mains I42-I42. V

In general, unwinding of the strip 4 from the drum I, rotates it and its shaft 2, and by means of the gearings J-K, the power supplying motor I40 is driven as a generator and supplies power back to the mains I42, and a hold-back load torque or braking action is thereby effected :on

the shaft 2 and drum I.

Thegenerator I40 has the construction of a squirrel cage induction motor which could be driven as a motor by, alternating current from the mains I42--I42'; but as is well known when such a motor is mechanically driven above synchronous speed, the curve oftorque to drive it rises very steeply, very much the same as the output torque curve rises when it delivers power as a squirrel cagemotor and is mechanically loaded to reduce its speed below synchronous fi H V M Other types of electric generators, C. or A. C. may be employed as the generator I40 but a squirrel cage induction motor type is'preferred because of its simplicity andits rapidly rising torque as aforesaid when driven as a gena -y 1 For purposesof explanation it will first beassumed that the fields of the units I24-I25 are equally energized by their field windings I28-I 23 bysome midposition-of-the rheostat contact-J33;

. l0 and the drum I and shaft 2 are at rest; and that the unit I40 is connected to the mains I42'I'42 and runs as a motor and drives the two spiders II6I I2 in opposite' directions.

Torque from thespider'II'IZ, under these assumed conditions, divides equally between :dii'ferentialgears H4 and H5; 'andtorque' from the spider ,I I6- likewise divides equally between differential gears'll8'lll,

This'tends to drive the connected pairs of gears II4I2I and I'I8I22 in opposite directions thesameas the spiders II2I I6, but the gears I2I'-"I22 beingb'oth meshed with the gear I23, no rotationoccurs; and the units I24-425 are driven in'opposit'e'directions, and at twice the speed of the spiders, II2 --II6,'

The unitsII24 -I25'having equal fields, under these assumed conditions, their output potentials are equal and opposite, and no load current flows in the load circuit I26I2I and no torque is developed at'the units 124 425. j

All torques in, the transmission, under these assumed conditions, are negligibly small, and the motor I40 will run "at substantially synchronous p g I .l .I If new the rheostat contact I33 be moved counterclockwise as viewed in Fig. 2, to a position at the left, of said midpesition, at which the field winding I29 of unit I25 will be energised morestrongly than the windin g. uzaqfjumt I24, the unit I25 will actas a generator and generate current in the circuit I2 6 I2l and drivejthe unit I24asamotorf Torque ie irs to ive t a o dd ene tor I25 and is taken from the power' driven spider IIIi driving the gear IIS and an equal torque consequently is developed on the gear H8 and its connected gear I22, the latter applying its torque to the gear I23 shaft 2, :and roll- I, and in, the direction to drive th roll in the forward or unwinding direction or clockwise as fi -a The generatedload current going to the motor I24 drives it as a motorand its develo ed, torque on the gear IIBreacts onthe spider II2 and develops an equal torque on the gear I I4 and its connected gear I2I, the latter applying its torque to the gear I23, and shaft 2 in the direction to apparatus isstartedup because until the roll I begins to rotate clockwise thespeed-set gear 63 of gearing E will rotate faster than gear 62; and the action of thespider 60 of the gearing E will rotate the contact I33 r counterclockwise as will be understood from ,the description hereinbefore. H This counterclockwise rotation of the contact I33 effects more andmore driving torque on the roll I and coil 3 and the latterrapidly speeds up toward a speed for the strip, at,which ,the speeds of the gears 32 and 63 of gearing E would become equal, and the contact I33 would stop moving counterclockwise If" the contact l33 lwere to come topaillio sition corresponding to which the roll I and coil 3 and strip 4 being wound on the roll I I would go. so fast that the gear, 62 at the gearing E (whose speediscontrolled by; the strip speed) would go faster than the genes, ,the spider 60 wqi ld r e; n jmol hasonteclf 3 geared;

wise and reduce the forward driving torque on ther'oli and the powerdriven speed of "the roll.

The contact I33 thus tendsto come' tb "the mid position at whic'hno driving power would be applied to theroll' 't, but doesnot actually do sobecause the power unit A winding the strip on the roll! I I constantly tends to causethe' gear 6'2 togo faster than thegear and the contact I33 therefore will alwayscome to a counterclockwise position, corresponding tda' forward power driven speed fonthe roll hat which'th'e tangential speed or strip speed therefrom, is less than the speed' of the strip being'woundon the'roll II. The strip therefore overhauls the rolr I and" the roll fI- is strip-driven faster than it tends to be power driven. This causesthe mechanism M to exert braking *ac'tion'onthe strip and causes tension to-be deteioped'in' it as foll'ows. e 4

Overhauling the roll" I and increasing its speed above that produced by 'the'power supplying motor I40; causes tliegears" I2I-+fI 4"-and* the gears Hi l-t8 to be driven in the same direction by'the-gear I 23; Thespidenf-lzis drivenfoppositely to the spider II6. The spider-H13 is driven in thesame' direction as the'gears" I 2 I --I I4 and the spider H2 'oppositelyfto thejg'e'ars I2l II 4=. Thus the gear H5 and-unit mwill be driven in the-same direction-as the spider H2.

driven" in the same direction; and theunit I'M will act asagenerator anddrive"the'*unit' as a motor. 7

Torque to drive the generator I' ZE' comes" from the gears IZI -HS and is-"su p pliedby the overhauling roll- I and tendst'o retard it, exerting a bra-king action-thereon. v I

The motor I25 applies tor ue t'0"th e gear H9 to driveit. The gears ln 'l I 8 are being; driven "by the overhauling" roll I. Both H 8 therefore react on the spider" II 6 to overdrive it in the same direction it'is being-driven, andthis drives the motor f' t'il-abovesynchronism andit beco'rhes'a generators'upplyirig current back into the1ine= I4 2". Thetorq'ue to-thii's overdrive the motor [-46- comes from thefn iotorf I'2'5 and from the gear I-fljand thetorque of 'thje latter comes from the roll I and tends-tdretard it and also exerts a: braking action thereon.

Braking action by the unit M? "ash/wholeis.

thus developed by'p'ov'ver drivingtherollW- at a relatively low speed but overhauling 15y the strip 'ata higher speed, against the opposition of the transmissionand agair-ist the driving-of the power motor i40 as a generator.

Asaforesaid; upon starting up" the apparatus, the coil 3-' is power -driven' to accelerate it and bring it up to the speed of operation: is one of 'the particular advantages ofthe-inventionin another aspect;

In some cases, the roll I and the coil 3 thereon may be of very great weightamrmertmand it wouldbe undesirable to subjectthe strip to the tension that"would--'beproduced thereon-by the windingunit A to start-and at;cd-z-l e'ratethe roll I. By the operation-abovedescribed inconnection with the braking; action of the "unit- M, the roll I is power driven td-start' accelerate 'itg and the greater itsinertia, "a'ncl the inure slowly it tends to accelerate; *the -greater the acceleratihg power'appliedto it. v U

With either braking mechanism, that"at i F,

ofsmaller radius "due 0 unwinding; tension in the strip would increase if the-'i'eguiated braking gears H9 and torque remained at a fixed value; but-stitchincrease of strip tension will tend to slow db'w-ii the strip as described for Fig. 1', and this will adjust the braking action to a smaller amount as described, so that changes or strip tension due to decreasecf diameter of the unwinding coil 3- are automatically prevented.

Changes of diameter of winding coil as winding goes on has- 'no effect because it is driven at its circumference as described.

Inthe foregoing the invention has been described as winding strip material as it comes from a supply wound ona' drum; and braking mechanism, in the operation'of the invention, acts on the drum. There are-cases in which it is desirable to Wind stripmaterial coming from sources of strip supply other than a wound drum; and to exert braking action thereonasaforesaid.

In Fig. 3- is illustrated, fragmentarily, onesuch modification of the invention.

The strip as at 4 A comes from an-y'sourc'e or supply Of'strip; and on its way to the above described" tier of rolls 5-1-9 of Fig. l is gripped The strip 4 is drawn through the rolls-as it is wound on the drum II by the mechanism of Fig. l and drives the roll I 45 in the same manner as it drives the ron 9* as described.

The'sh-aft 2 is connected at"one/end. to'the 'rol1 I45 and driven thereby; and'at the other endhas differential connections-"with eitherthe braking unit F'of Fig. lor the brakingun-it 'M of Fig. 2 as described for the'shaft 2 of otherwise is the same as that of Fig. 1 or Fig.2.

As to the power supplying motors ZI' and Q2 of Fig. 1'; and theinotor I of Fig; 2 when braking is to be done by the unit'M; they will in general be started and brought up to fiill speed all at the same time in which event the respective supply wires to-the motors Ina-y all be connectedto a common supply of current through a well known common motor starting contact'o'r' or apparatus,- not shown.

However the motors have been shown-as having separate current supplyconductors asindicating that starting contactors or other starting apparatus may be provided individually for "each motor and the motors therefore's'tarted'and brought u'pto speed at di fier'enttimes if desired.

I claim-2' 7 1-. A- strip material winding apparatus-,"com- 'pri'sing; a winding drum adapted to be"d'riv'en by power to- Wind strip materiaI'thereon; 'a

rotary element arranged to be rotated "by the strip asit is being-wound; brake mechanism braking rotation of the rota-ryelement; mechanis'm responsive to thelinear'spe'ed of the strip as it is being Wound and controlling the brake "mechanism to increase the braking.- action upon an increase of' stripspeed and to decrease "it 2.- A strip material windingmechanism cornprisin a: winding drum; ai'po wer' unitappling torque to the drum to drive it to wind st'rip elethe strip; mechanism responsiveto changes of linear speed of the strip above or below a predetermined value as it is being wound, and controlling the brake mechanism to respectively'increase and decrease the braking action upon a tendency for the strip speed to increase or decrease above or below said predetermined value, effective to maintain the strip speed at said predetermined value.

3. A strip material winding mechanism com.- prising; a winding drum; a powerunit' applying torque to the drum to drive it to wind strip prising adjusting means to adjust the predetermined value of speed to which it responds;

and adjusting means to adjustthetorqueof the power unit to cause it to maintain constant tension'in the strip atv all predetermined speed values.

4. A strip material winding mechanism comprising; a winding drum; a power unit applying torque to the drum to drive it to wind strip material thereon; a rotary element arranged to be rotated by the strip being wound; brake mechanism braking rotation of the rotary element, whereby said torque produces tension in the strip; mechanism responsive to changes of linear speed of the strip above or below a predetermined value as it is being wound, and controlling the brake mechanism to respectively increase and decrease the braking action upon a tendency for the strip speed to increase or decrease above or below said predetermined value, effective .to maintain the strip speed at said predetermined value; the mechanism comprising adjusting means to adjust the predetermined value of speed to which it responds; and adjusting means to adjust the torque of the power unit to cause it to maintain constant tension in the strip at all predetermined speed values; and a connection betweenthe two adjusting means for effecting an adjustmentof the torque concurrently with an adjustment of the predetermined speed value. I

5. A strip material winding mechanism comprising a winding drum for winding strip material in a coil thereon; a-power unit applying torque to the periphery of the coil to wind the strip material; brake mechanism braking movement of the strip toward the drum, whereby the said torque produces tension in the strip; automatic speed responsive apparatus causing the braking action to vary in response to tendency of strip speed to change, effective to maintain the strip speed constant; the power'unit comprising means to cause the drum-applied torque to be constant, at constant drum speed effected by said constant strip speed, to maintain the strip tension constant.

6. A strip material winding mechanism comprising a winding drum, for winding strip material in a coil thereon; a power unit applying torque to the periphery of the coil to wind the strip material; brake mechanism braking movement and the strip driven element; the power unit 5174 ment of the strip'toward the drum,-whereby'the said torque produces tension in the strip; speed responsive apparatus causing the braking action to vary in responseto tendency of the strip speed to change, effective to-maintain the strip speed constant, and means to adjust the speed responsive apparatus to change the constant speed; the power-unit comprising means to cause the drum applied torque to --be constant at constant strip speeds, and comprising means to adjust the con,-

stant torque. Vi Y 7; A strip material winding apparatus comprising: a winding drum; a power unit applying wrqueto the drum "to drive it to wind strip material thereon; a rotary element arrangedto be driven; by movement of the strip material toward the drum; brake mechanism braking rotation of the rotary element; a speed reference unit having a rotary output element rotating at a fixed speed; aydifierentialgearing comprising three gearing elements; one element driven, by the output element of the speed; reference unit; means driving another element at speed proportional to the strip l near S eed; a ro at n of t d lem n controllingthe effectiveness of the brake mechaism- 7 Va. A strip material-winding mechanism com:-

prising a winding drum; a powerunit applying torque to the drum to drive it to wind strip inaterial thereon; brake mechanism braking move ment of the strip toward the drum whereby said torque produces tension in the strip; a speedreference unit having a rotary output elementrotating at a fixed speed, and an adjustment means to adjust the fixed speed; astrip-driven rotary .element driven by linear movement of; the strip toward the drum, at speed proportional to strip speed; a control for varying the effectivenes s of the brake mechanism responsive to the difference of speed of" the speed reference output elecomprising electric winding means, the degree of energization of which controls the value of .said torque applied to the drum adjustment means for adjusting the energization of the winding means; interconnection means between the adjustment means of the speed reference unit and the adjustment means of the winding means,

whereby a change ofadjustment ofone effectsi'a concurrent change of adjustment of the other.

9, A, strip material winding meohanisrn'comprising a winding drum; a power unit applying torque to the drum to drive it to wind strip material thereon; brake mechanism braking movement of the strip toward the drum whereby said torque produces-tension in the strip; a speed reference unit having a rotary output element rotating at-a fixed speed, and an adjustment meansto adjust the fixed speed; a strip-driven .rotary element driven by linear movement of the strip toward the drum, at speed proportional to strip speed; a control for varying the effectiveness of the brake mechanism responsive to the differ- .,ence of speed of the speedreference output element and the strip driven element; the power unit comprising electric yvinding means, the degree of energization of which controls the value of said torque applied to the drum; adjustment means for adjusting the energization of the winding means; interconnection means between the adjustment means of the speed reference unit and the adjustment means of the winding means, whereby a change of adjustment of one effects a concurrent change of adjustment of the other; and a second adjustment mean for changing amen-pas the ehengizati on of' the Winding means: independently of: the said" interconnected adjustment I means;

1'0: A strip winding apparatus-comprising: a Winding drum; a power unit applyingtorque to the drum-to drive-it to wind strip materialthereon; a rotary element rotated by thee-'strip being Wound brake'mechanism braking rotation of the rotary element; whereby said applied torque produces tension in the strip; fa-strip-driven element rotatably driven by the linear movement of the strip toward; the drum at rotary speed proportional to the strip linear speed; a -power- :driven speed reference mechanism having a rotary output element adjustable to'difierent selected fixed rotary speeds; means controlling 'the braking effect'ofthe brake mechanism responsive to the difference of rotaryspeeds 'of thestrip driven element and the 1 speed reference'output element;

1 1-; A strip material winding apparatus comprising a power-supplying unit; applyingto'rque-to a winding drum to wind a coil" of strip material thereon, and constructed to*- deliverdifferent values of constant 'torqueat di'fierent' constant speeds; and comprisingmeans to adjust the-constant torque value at any constant speed; braking apparatus braking movement of the-"strip toward the windingdrum- -whereby torque applied to'thedrum produces tension in thestrip; strip speed responsive apparatus causing the braking action to increase and* decrease in accordance with tendency of the strip speed 'to increase and decrease totmaintain the strip speed constant, and comprising adjusting means'to adjust" the constant strip speed.

12. A strip material winding apparatus comprising a power-supplying unit, applying-torque to a-winding drum to wind a coil of strip -material thereon, and constructed to deliver different values-"of constant torque at" different constant speeds, and-comprisingmeans to adjust'the constant' torque value at 1 any constant speed; braking apparatus brakingmovement of the strip toward the Winding drum whereby torque applied to the" drum produces tension in the strip; strip speed responsive apparatus causing the braking actionto increase and decrease in accordance with tendency of the strip speed" to increase and decreaseto maintain the strip speed constant, and comprising adjusting means to adjust the constant strip speed; thepowerunit-arranged to apply thewinding torque to the periphery ofthe coil being woundon thedrum; whereby the apparatus winds the strip at adjUstablieconstant-speedand adjustable constant tension.-

13. An apparatus for Winding strip material in a first rotatably supported coil and unwinding it'from a second rotatably supported coil; comprising: a motor driven transmission having-- a rotary output element arranged to apply winding'torque to the outer periphery of the first-coil; the transmission having a torque-speedcharacteristic according to which the torque appliedby its output element decreases with increase of its speed and vice versa; brake mechanism-forvariably braking'unwinding rotation of the' second coilwherebytorqueson sthesfirst coileproduces ten? sion in the stn p; ,azpowen. driven speed. reference mechanisnrnhaving;.azrrotarya'speed:xelement-rand adjustingemeans;td-adjustthe speed of thespeed elementmndmaintaintit atLconstant selected fixed speeds;.. a. speed responsive =rotary element and meanstoirotate itiat speeds corresponding to the linear-uspeedxof-z the strip; alternately rotatable means for increasing and decreasingtthe braking effect tofzi'the ebrake:mechani sm..and. driven .difierentially; byi theispeeds oicthe said .speed element and the 1 said? speed; responsive :element and the transmission: comprising means. for adjustably varyingitheitorqueof its output element,

14;. .The iapparatus .idesoribedz in. claim 13 :and ,in which, the -.brake umechanism: comprises a brake drum driven bythe second .coil andsa brake shoe frictionally engaged? therewith; and mechanism interoonnectingzthe brake shoe ands-the alternate- 1y rotatable means; BfiBQfiVS-L-tO i alternately increaserand decrease the-engagement frictiom responsiye to alternate -rotary z movements moi. .the alternatelyirotatable means.

15:: The;apparatus-described; in. claim, 13. and in which the brake mechanism vcomprisesia; power driven braking transmissionihaving a. rotary. output'element, arranged to :apply retarding-torque to the seoondcoiltoyieldinglyoppose unwinding rotation thereofand thesbrakmg transmission comprises imean'sn responsivev to alternate; movements of the alternately rotatable means efiective to u ncr ease and decrease 2 the. retarding: torque.

16; In a; strip 1 material winding apparatus,- a windingdrum drivenubsp aefirst; constantly running motortthroughinifirst ;transmission:to :Wind strip onthe drum; thfiisfiISt'jlSlfflIlSllfiSSiOH. being responsiveito; applyfirst motorctorquetothe drum that decreases as-the; drum speed increases ,and

vice -versa-; afirstrlrotary element and; ajrseoond r rotary: element each", constrained. to rotate at. a

speed "corresponding;toithespeedofzthe strip toward"- the -.drum-; a: second'imotor of 1: an. electric type 1 that: can b eaoverdriven: andidevelop electric load supply.- line connected: thereto; ,1 connected to the firstvrotaryi element :through a. second transmission; matspeed responsivemechanism operated-by: the second; rotaryrelement; ,the: secand-transmission arrangedttorapplyz electric;.mo-

to torque; to; thee first; rotary;- element in, the

- strip movingi direction to: accelerate-it Lwhen the stripstarts to move; and:.the second; transmission being responsive tozthew speed 1 responsive mechanismwrtend to drivetthes first rotaryele- Nor rederenceszcitedi V

Images