US 3851832 A
An apparatus for winding up a web, particularly a cord fabric with loose wefts, to form a web roll on a winding core. The web with the core supported in bearings, is rotated by a pair of drive rollers, independently driven by a pair of adjustable hydraulic motors, and mounted on a pair of carriers which are pivotally supported by a pair of swing arms moved by hydraulic motors toward the web so that the carriers and drive rollers assume positions in which both drive rollers frictionally engage and wind up the web while the winding core rotates in bearings. The carriers can be turned relative to the swing arms by another motor to drop the finished web roll onto a ramp when the core with the completed web roll is released from the bearings.
Claims available in
Description (OCR text may contain errors)
United States Patent [191 Krueckels et a1.
[ Dec. 3, 1974 1 WINDING APPARATUS FOR A WEB  Assignee: Maschinenfabrik Zell J. Krueckels KG, Zell, Germany  Filed: Oct. 16, 1972  Appl. No.: 297,989
7/1963 Washburn 242/66 5/1964 Miller 242/66 X Primary Examiner.lohn W. Huckert Assistant Examiner-Edward J. McCarthy Attorney, Agent, or Firm-Michael S. Striker 5 7 ABSTRACT An apparatus for winding up a web, particularly a cord fabric with loose wefts, to form a web roll on a winding core. The web with the core supported in bearings, is rotated by a pair of drive rollers, independently driven by a pair of adjustable hydraulic motors, and mounted on a pair of carriers which are pivotally supported by a pair of swing arms moved by hydraulic motors toward the web so that the carriers and drive rollers assume positions in which both drive rollers frictionally engage and wind up the web while the winding core rotates in bearings. The carriers can be turned relative to the swing arms by another motor to drop the finished web roll onto a ramp when the core with the completed web roll is released from the bearings.
16 Claims, 10 Drawing Figures Pf/ A PATENTEL DEC 74 SHEEI 3 OF 6 saw 5 0F 6 PATENTEL 31974 WINDING APPARATUS FOR A WEB BACKGROUND OF THE INVENTION Winding apparatus is known which comprises a pair of swing arms carrying a drive roller contacting the winding core or the web wound thereon, to drive it by friction. This has the disadvantage that the drive roller slips on the web if the friction coefficient of the material is low, unless slipping is prevented by a very high 1 contact pressure. However, high contact pressure between the drive roller and the web roll frequently result in very hard web rolls. Other apparatus for winding up a web is known, in which a web roll and its winding core are supported on a pair of drive rollers mounted -in stationary bearings so that when the web is wound up, the winding co're rises as the diameter of the web roll increases. During this operation, the weight of the web roll increases with the diameter, and the hardness of the web roll becomes undesirably great.
Hard web rolls are undesirable, particularly if the web roll consists of certain types of fabrics. This is particularly true of cord fabric with a loose weft, as is used in the manufacture of tires. However, the hardness of the web roll should conform to the weight and to certain characteristics of the material, since a predetermined winding density is required.
A disadvantage of known winding apparatus of this type, is that very smooth material, such as nylon, slips relative to the single drive roller so that the web is not properly wound up.
SUMMARY OF THE INVENTION It is the object of the invention to provide an apparatus for winding up a web, which overcomes the disadvantages of prior art apparatus serving the same purpose.
Another object of the invention is to provide a windup apparatus in which the web is reliably wound up on a core, even if the web consists of a very smooth synthetic yarn, such as nylon.
A further object of the invention is to obtain a predetermined uniform winding density of the web roll, which is not influenced in an undesirable manner by additional pressure required for driving the web roll.
With these objects in view, the present invention comprises a pair of drive rollers mounted on carrier means turnable with the same about a common shaft.
It has been found that such an arrangement according to the invention overcomes the disadvantages of known winding apparatus, that the two drive rollers contact the winding core or the web with practically the same pressure, and that reliable driving of the web roll is assured without increasing the hardness of the web roll.
One embodiment of the invention comprises bearing means supporting a winding core for rotation about a.
core axis; a pair of drive rollers for frictionally engaging and winding up a web on the core; carrier means supporting the drive rollers; and supporting means supporting the carrier means with the drive rollers for angular movement about a carrier axis parallel to the core axis, and also for movement with the supporting means toward and away from the core axis.
0 support for supporting one pair of ends of the arms for Due to the fact that the drive rollers are supported on a pivotally mounted carrier means, the two drive rollers can angularly move to hold the drive rollers at all times in engagement with the wound up web whose diameter varies.
The pressure and frictional engagement between the drive rollers and the wound up web depends on the action of the adjustable motors on the arms, and the motors are adjusted by control means depending on the angular position of the pair of arms, which is preferably signalled by a potentiometer. I
A regulating unit is provided, controlling a pressure valve which controls one or more hydraulic systems or similarregulating systems controlling the adjustable hydraulic motors which operate the swing arms to press the drive rollers against the wound up web. In this manner, the contact pressure between the drive rollers and the web roll can be controlled in a predetermined manner, for example by decreasing, maintaining constant, or increasing the pressure between the drive rollers and the web. The contact pressure exerted by drive rollers on the web roll can therefore be varied in a predetermined manner depending on the radius of the wound up web roll as required for the specific web roll which is being wound up. It is advantageous to provide operating means also for pivoting the carriers relative to the swing arms. Hydraulic motors are used which are connected with the carrier means to angularly displace the same relative to the swing arms. The carrier means are preferably a pair of bearing flanges supporting the drive rollers, and being pivotally mounted on the swing arms.
The contact pressure exerted by the drive rollers on the wound up web, can be additionally varied by means of this hydraulic system.
It is advantageous to provide a'discharge lamp onto which a completed web roll drops when the winding core thereof is released by the bearings. The finished web roll can easily roll down the ramp to a support on which it rests.
In order to perform the above-described discharge operation, the carrier axis of the bearing flanges in the pair of swing arms, is spaced a greater distance from the support than the axis of the winding core. When the winding core is then released from its bearing, the greater part of the weight of the web roll acts on the drive roller closer to the support than on the other drive roller, and this causes an angular movement of the carrier means or bearing flanges about the carrier axis on the swing arms so that the other drive roller farther spaced from the support, urges the web roll to move over the first roller onto the discharge ramp.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims.'The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING FIG. I is a side view illustrating an embodiment of the invention;
FIG. la is a fragmentary side view illustrating a detail of the embodiment of FIG. 1',
FIG. 2 is a plan view taken in the direction of the arrow II in FIG. 1;
FIG. 2a is a schematic diagram illustrating a partly electric, and partly hydraulic control circuit for controlling hydraulic operating means of the embodiment of FIG. 1;
FIG. 2b is partly a fragmentary plan view, and partly a diagram illustrating a hydraulic circuit for angularly displacing the carriers of the drive rollers of the embodiment of FIG. 1',
FIG. 3 is a front view taken in the direction of the arrow III in FIG. 1;
FIG. 3a is partly a fragmentary front view, and partly a diagram illustrating a hydraulic circuit for releasing a winding core from its bearings;
FIG. 4 is a fragmentary, partially sectional view, illustrating the region illustrated by the arrow IV in FIG. 2 on an enlarged scale;
FIG. 4a partly corresponds to FIG. 4, and partly shows a diagram illustrating the hydraulic circuits of the hydraulic motors by which the drive rollers are rotated; and
FIG. 5 is a fragmentary front view illustrating the control panel of the apparatus.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, two drive rollers 1 and 2, which may be rubber coated, are supported by lateral carriers, shown to be bearing flanges, 3 and 4 having bearing bores in which the shaft end portions 2 of drive rollers l and 2 are mounted for rotation, as best seen in FIG. 4. The carriers or bearing flanges 3 and 4 are connected with each other and maintained at the required axial distance by a cross beam 5. Each end of the cross beam is secured to the corresponding bearing flange, for example by screws. Cross beam 5 has shaft end portions L which support the carriers or bearing flanges 3 and 4, for angular movement at the ends of a pair of swing arms 6 and 7 which have ends connected by a shaft 13 mounted in bearings 13a of support means 20. A pair of hydraulic cylinder and piston motors 8 and 9 connects the swing arms 6 and 7, respectively, with arms 10a which are secured to the cross beam 5, so that by operation of the hydraulic motors 8 and 9, the bearing flanges 3 and 4 are turned about the axis 10 of the shaft portions L, resulting in angular displacement of drive rollers I and 2 relative to the swing arms 6 and 7. When the piston rods of the hydraulic motors 8 and 9 move in the direction of the double arrow PfI, the carrier means 3, 4, 5 turns in the direction of the double arrow PfZ. FIG. 2b shows the hydraulic circuit by which the hydraulic piston and cylinder motors 8 and 9 are operated. The two working chambers on opposite sides of the pistons 8a, 9a are connected by conduits with control valves 60 and 61, each of which is shifted by an electromagnet between the two schematically indicated positions for effecting reversal of the piston movement of hydraulic motors 8 and 9. A pump P supplies pressure fluid through a pressure responsive limit valve 62 to the control valves 60 and 61. A manometer 63 indicates the pressure in the hydraulic circuit. When the pressure in the system is too high, fluid is discharged from the low pressure dis' charge conduit 63 by the action of the pressure limiting valve 62, which is adjustable.
As best seen in FIGS. 2, 4 and 4a, the shaft portions Z of the drive rollers 1 and 2 penetrate the respective bearing flanges 3 and 4, and are connected to the rotors of two independently operable hydraulic motors I1 and 12. The rotary hydraulic motors 11 and 12 drive the drive rollers I and 2 with the required torque, and are adjustable for varying the torque and rotary speed of the rotors.
FIG. 4a shows two hydraulic control circuits 52 and 53 for adjusting the hydraulic motors 11 and 12, respectively. Each control circuit includes a motor M driving a pump P which pumps fluid into the respective hydraulic motor 11 or 12. A pressure limiting valve 55 limits the output pressure of pump P and discharges through conduit RL into an open discharge container 54 when the pressure is too high. Another pressure limiting valve 50 discharges when the suction pressure of the pump becomes too high.
The swing arms 6 and 7, which are rigidly connected by the cross shaft 13 at the ends thereof remote from the bearing flanges 3 and 4, are connected by a gear sector 14 and a pinion 15 with a potentiometer 16 as shown in FIGS. 1 and 2.
A pair of hydraulic cylinder and piston motors 17 and I8 is provided for turning the swing arms 6 and 7 in clockwise direction about the axis determined by bearings 13a, so that the bearing flanges 3 and 4 with the drive rollers I and 2 are pressed against the web being wound on the core WK. This pressure is controlled by adjustment of the hydraulic cylinder and piston motors 17 and 18.
FIG. 2a shows the circuit of the potentiometer 16 which transmits resistance signals through conductors E depending on the angular position of the arms 6 and 7, and of the tap of the potentiometer 16 which is connected for rotation with the cross shaft 13 and the arms 6 and '7. The signals of the potentiometer, representing different resistances and angular positions, are transmitted to the regulating device 54 which generates and transmits corresponding control pulses to a hydraulic control valve 55 of a hydraulic control circuit which includes a pump P driven by motor M, an open discharge container 81, a throttle and check valve 82, a pressure responsive valve 83, and an electromagnetically operated control valve 84 capable of reversing the flow in the hydraulic cylinder and piston motors 17 and 18. The hydraulic circuit further includes a number of check valves 85, and a pressure limiting valve 86.
The partly electric, and partly hydraulic control circuit shown in FIG. 2a operates the hydraulic motors l7 and 18 in such a manner that the pressure of the drive rollers 1 and 2 against the web being wound up, depends on the diameter of the web and correspondingly on the radial distance between the drive rollers and the core axis.
The adjustment of the pressure is particularly carried out while the radius of the web roll increases. For example, as the radius R of the web roll increases, the pressure of drive rollers 1 and 2 can be increased or decreased, or maintained at the same level, depending on the desired density of the completed roll, or on a desired variation of the density within the roll. Depending on the desired pressure, oil is supplied to the hydraulic motors l7 and 18 by the electro-hydraulic circuit shown in FIG. 2a. As best seen in FIGS. 1 and 2, one pair of ends of the hydraulic motors 17 and 18 is pivotally secured to the swing arms 6 and 7, and the other ends are pivotally secured to a rigid support.
On the right side of FIG. 2, a rigid support is shown, which has a slightly slanted support face 20a, and a stop face 20b for receiving and holding a completed web roll W. A discharge ramp 19 is provided and has a top surface downwardly slanted toward the support face 20a, and having a higher end on the left as viewed in FIG. 1 located under the wound up web roll W.
As shown in FIG. 3, bearings 21 and 22 are provided on supports St and slidingly receive shafts or journals 30, 31 having non-circular coupling portions 35 which cooperate with corresponding recesses 36 in the winding core WK, as best seen in FIG. 3. During the winding of a web on the winding core WK, the coupling portions 35 are in the recesses 36, and the drive rollers 1 and 2, pressing against the wound up web, cause rotation of the web roll W together with the winding core WK while journals and 31 rotate in bearings 21, 22.
As shown in FIG. 3a, the journals 30 and 31 carry pistons 56 and 57 located in the bearing cylinders 21, 22, respectively, which are constructed as closed hydraulic cylinders so that by supplying and discharging fluid from the working chambers formed by pistons 56 and 57 in the cylinders 21 and 22, the journals 30 and 31 are moved between a position releasing the winding core WK and a position coupled with the winding core. The movement of the piston journals 311, 31 is controlled by two hydraulic circuits 80 and 80 each of which includes check valves 81, throttles 82, a control valve 83 operated by electromagnetic means between two control positions for reversing the flow to and from the bearing cylinders 21, 22, and a pressure limiting valve 84.
The mode of operation of the apparatus, and further characteristics of the invention will now be described, starting at the moment at which the completed web roll W is to be changed. When the web roll has been wound to the required diameter, the hydraulic circuits 80 and 80' operate the pistons 56 and 57 in cylinders 21 and 22 so that the coupling portions 85 are withdrawn from the recesses 86 of the winding core WK, as shown in FIGS. 3 and 3a. Limit switches 23 and 24 are operated by the moving journals 30 and 31 to generate signals indicating the coupled or released condition of the winding core WK.
When the winding core WK has been released, the weight of the wound up web roll urges the drive roller 1 downward, as shown in FIG. 1 since the center of the core is located above drive roller 1. The displacement of drive roller 1 causes pivotal movement of the bearing flanges or carriers 3 and 4 so that drive roll 2 moves with the carriers 3 and 4 upward and against the web roll W, as indicated by an arrow in FIG. 1. A stop is provided for limiting the angular movement of the carriers 3, 4 about the axis 10, and may be a stop portion 32 of carrier 3 abutting a portion of arm 6 in a stop position.
Since the carrier axis 10 of the carriers 3 and 4 is farther spaced from the support 20 and the ramp 19 a greater distance than the axis of core WK, the web roll W is automatically pushed onto the higher end of the slanted ramp 19, so that the web roll rolls along the ramp 19 onto the supporting face 20a, stopped by the stop face 20b. The web end portion 33 is cut off by a cutter, not shown, and the finished web roll W can be removed from support 20.
' For the next winding operation, a new winding core WK must be used. When a new core WK is placed in the position shown in FIGS. 3 and 3a, the valves 83 are operated to shift the piston journals 30 and 31 inward so that the ends of the winding core are coupled by coupling portions 85 so that the new core is supported for rotation by the journals 311, 31 in bearings 21, 22, as best seen in FIG. 3a.
The operation of valves 83, 83' can be carried out semi-automatically by operation of a manual switch 70, shown in FIG. 5 which illustrates a control panel for the apparatus of the invention. When switch is operated, the required operations for securing the new winding core W are automatically carried out by the electromagnets 89, 89' of control valves 83, 83'.
The control means shown in FIG. 2a control the operating means 17 and 18 to move the swing arms 6 and 7 to a position 7', shown in FIG. 1 and FIG. 1a, so that the drive rollers 1 and 2 engage the winding core WK in the positions 1' and 2. In this position, the swing arm 7 operates a limit switch 59 which causes the control circuit of the operating motors 17 and 18 to lock the operating means 17 and 18 in the position 7. The control means of the apparatus also control the hydraulic cylinder and piston motors 8 and 9, as shown in FIG. 2b so that the drive rollers 1 and 2 are displaced together with the carriers 3 and 4 to the positions 1 and 2' shown in FIGS. 1 and 1a. The parts 6, 7, 3, 4, 1 and 2, and the bearings 21, 22 with the journals 31, 30 are all placed in a position in which the next web roll can be wound.
The further steps of the operation are either controlled by manual operation of a key, or take place fully automatically, effecting the movement of the journals 30, 31 to the coupled position, not shown, in which the journals 31), 31 move in the directions of the arrow Pf4, PfS shown in FIG. 3 into engagement with the winding core. When the winding core is supported in this manner in bearings 21 and 22, the limit switches 23 are actuated so that the journals 30, 31 are blocked against axial movement, assuring a reliable bearing support for the winding core which now starts its rotation in the direction of the arrow Pfo shown in FIG. 1.
The winding operation may be started by operation of a manual switch which causes the actuation of the hydraulic cylinder and piston motors 17 and 18 in such a manner that the desired pressure of the drive rollers 1 and 2 against the web depends on the diameter of the web roll whose diameter continuously increases. The hydraulic piston and cylinder motors 8 and 9 can be automatically operated to vary the pressure between the drive rollers 1 and 2 and the web. Furthermore, the drive rollers 1 and 2 are driven by the rotary hydraulic motors 11 and 12, which turn drive rollers l and 2 in accordance with the arrows Pf7 so that the web roll W rotates in the direction of the arrow Pf6 shown in PK]. 1. Since both drive rollers l and 2 are mounted on carriers 3 and 4 for angular movement together about the axis 10, the drive roller can easily adjust to the circumferential contour and curvature of the winding core or web roll.
The torque exerted during this operation by the web roll and winding core on the drive rollers 1 and 2, and on the carriers 3 and 4, respectively, in relation to the carrier axis 10, can be compensated as required, and if necessary overcompensated by the hydraulic cylinder and piston motors 8 and 9. The possibility of varying in the course of the winding operation the contact pressure between the drive rollers l, 2 and the web roll W, has already been mentioned.
When a winding operation on a core has been finished, and the core WK has been released as shown in FIGS. 3 and 3a, the hydraulic cylinder and piston motors 8 and 9 can assist in the discharge of the finished web roll by swivelling the carriers or bearing flanges 3 and 4 about their axis to cause drive roller 1 to move down, and drive roller 2 to move upward it is advantageous to place the carriers 3 and 4 with the drive rollers 1 and 2 in a position located below the web roll W.
FIG. 5 shows schematically the control panel of the apparatus .of the invention. The manually operated switch by which the operations for inserting a new winding core W is started, is designated by reference numeral 70. By operation of the switch 7ll, the journals 30 and 31 are moved to the releasing position so that the web roll W rolls to the position W'. The switch 72 manually control the hydraulic motors i7, 18, if it is desired to move the arms 6 and 7 upward. Potentiometers 63 and 64 are provided for controlling the contact pressure depending on the varying radius of the web roll in a program determined manner, as explained above. An indicator device 65 shows the pressure in the cylinder and piston motors l7 and 18. 66 is an emergency switch in which the operation can be interrupted in an emergency.
Instead of using hydraulic motors 8, 9 and l7, l8, operated with oil as pressure medium, pneumatic cylinder and piston motors can also be used. If necessary, the
required regulating forces can be mechanically produced. However, the control and regulation by hydraulic cylinder and piston motors is particularly advantageous especially with a view to efficient control and establishment of definite control positions.
The apparatus is particularly suited for the winding of web rolls consisting of cord fabric with loose weft inserts, as are required for the manufacture of car tires, where the hardness of the web roll has to conform to the weight of the material and its properties, and in which certain winding densities are required.
It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of winding apparatus for a web differing from the types described above.
While the invention has been illustrated and described as embodied in a winding apparatus with two drive rollers engaging the wound up web and being pivotally mounted on movable supporting arms. it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can by applying current knowledge readily adapt it for various applications without omitting features that, from the standpoint of prior art. fairly constitute essential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and are intended to be comprehended within the meaning and range of equivalence of the following claims.
What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.
1. Winding apparatus for a web comprising a core; bearing means supporting said core for rotation about a core axis; a pair of drive rollers for frictionally engaging and winding up a web on said core; carrier means supporting said drive rollers; supporting means supporting said carrier means with said drive rollers for angular movement about a carrier axis parallel to said core axis, and also for movement with said supporting means toward and away from said core axis; operating means for displacing said supporting means with said carrier means and drive rollers so that said drive rollers are pressed against the web for winding up the web while said carrier means assumes a position in which both said drive rollers abut the web being wound up, irrespective of the diameter of the wound up web roll.
2. Winding apparatus as claimed in claim 1 wherein said operating means include adjustable motor means for displacing said supporting means for varying the pressure between said drive rollers and the wound up web.
3. Winding apparatus as claimed in claim 1 wherein said supporting means include a pair of arms, and a support for supporting one pair of ends of said arms for angular movement; wherein said carrier means include bearing flanges supporting the ends of said drive rollers for rotation, and being mounted on said arms, respectively, for angular movement about said carrier axis; and wherein said operating means connect said support with said arms.
4). Winding apparatus as claimed in claim 3 wherein said operating means include a pair of adjustable motors connecting said support with said arms, respectively; and control means for adjusting said motors depending on the angular position of said pair of arms.
5. Winding apparatus as claimed in claim 4 wherein said motors are hydraulic motors; and wherein said control means include an electric device connected with said arms for angular movement between angular positions for generating different signals, control valve means controlled by said signals, and a hydraulic control circuit connecting said control valve means with said adjustable motors for adjusting the same in accordance with the angular positions of said arms.
6. Winding apparatus as claimed in claim 1 and including other operating means connected with said carrier means for angularly displacing said carrier means relative to said supporting means so that said pair of drive rollers can be placed in different positions.
7. Winding apparatus as claimed in claim 1 compris ing a pair of drive motors mounted on said carrier means for driving said drive rollers, respectively, independently of each other.
8. Winding apparatus as claimed in claim 7 wherein said drive motors are hydraulic motors connected with said drive rollers, respectively; and further comprising a pair of hydraulic circuits including a pair of pumps, and a pair of control valve means connecting said pumps with said hydraulic motors, respectively, and being independently operable to adjust the torque and rotary speed of said hydraulic motors.
9. Winding apparatus as claimed in claim 1 comprising a support for a completed web roll; and a ramp downward slanting toward said support, and having one end located under said core and a web roll wound thereon; and means for releasing said core from said bearing means so that the completed web roll drops onto said one end and rolls down said rarnp onto said support.
10. Winding apparatus as claimed in claim 9 wherein said carrier axis is spaced farther from said support than said core axis so that the weight of the completed web roll urges said carrier means to turn so that said drive rollers move the web roll onto said one end of said ramp.
ll. Winding apparatus as claimed in claim 10 wherein said pair of drive rollers is located below said core and a web roll wound thereon.
12. Winding apparatus as claimed in claim 11 wherein said one end of said ramp is located adjacent one of said drive rollers; and wherein the uppermost portion of said one drive roller is located slightly above said one end of said ramp when engaging a completed web roll;
13. Winding apparatus as claimed in claim 12 wherein said carrier means include a stop portion engaging said supporting means in an angular position of said carrier means for stopping said carrier means in a stop position in which said one drive roller is lower than the respective other drive roller so that a completed web is pushed onto said one end of said ramp; and comprising other operating means connected with said carrier means for angularly displacing said carrier means relative to said supporting means to said stop position.
14. Winding apparatus as claimed in claim 11 wherein said bearing means include two journals for engaging the ends of said core; comprising two hydraulic motors operable for withdrawing said journals from said core so that a core with a completed web roll can be released to rest on said drive rollers.
15. Winding apparatus as claimed in claim 14 comprising limit switches operated by said two journals for causing locking said journals in engagement with said core when said supporting means are in a position in which said drive rollers are operative.
16. Winding apparatus as claimed in claim 1 including program controlled means for actuating said operating means to move said supporting means so as to vary the pressure between-said drive rollers and said wound up web in a predetermined cycle.