US2684210A - Winding machine - Google Patents

Description

Patented July 20, 1954 WINDIN ACHIN J hn D- C n i. lkins Park, 1%. a s snor t merican Viscose Corporation, Philadelphia, Pa a corporation of Delaware Application February 18, 1952, Serial No. 2 72 ,183.

UNITED STATES TTATENT OFFICE 5 Claims. 1.

This invention relates to a winding machine and particularly to a winding machine for simultaneously winding a plurality of strips, such as tapes, ribbons or the like.

In the winding of tapes, particularly following or tapes.

an operation upon the tapes, such as slitting, winding system for producing a plurality of coating or the like, it has been the practice herepackages either one at a time or simultaneously tofore to drive a shaft upon which one or more which are substantially alike appearance and winding cores are rotatably mounted in such a density regardless of. whether the drive systemmanner that friction means transmits the motion IQ for the winding shaft'rotates such shaft at con of the shaft to the winding core whereby rotastant speed. or at a varying speed" depending upon tion of the shaft at somewhat greater speed than the change in diameter of the package during the rate of delivery of the tape to the core efwinding. fectuates the winding while tensioning' the tape Other objects and advantages of the invention In some of such systems, the shaft is will be apparent from the drawing and the dedriven at such a speed that regardless of the scriptionthereof hereinafter. diameter of the windings on the take-up pack- In the drawing, which is illustrative of a preage, the linear peripheral speed would be at al ferred embodiment oft-he invention, times greater than the speed of delivery of the Figure 1 is an end elevation, somewhat diatape, such as from the slitting or other procgrammatic, showing a preferred embodiment of essing operation, except for the fact that the the invention, tension produced in the tape or tapes holds the Figure 2 is a front elevation of the winding package back through the friction mounting shaft driving systems on a somewhat enlarged thereof on the driven shaft. The shaft may be scale, driven at constant speed or, if desired, it may be Figure 3 is a still further enlarged view showdriven at variable speed which is controlled by ing the interconnection between the friction the diameter of the package being wound so that drive and the winding core. the shaft speed is continuously or periodicall AS shown in Figure l, a wide sheet or film 2!) reduced during the winding operation as the diis delivered from an unwinding roll 2| thereof ameter of the package builds up. The friction 3.0 by means of a pair of nip feeding rolls 2 2 and driving connection between the shaft and the winding core heretofore used is of course subjected towear and in the case where the shaft is driven at constant speed, the difference in speed between, the core and shaft varies through 0 a wide range during the winding operation. Such systems are prone to wear unevenly so that not only is an individual package subject to fluctuations in tension during the winding thereof but when a plurality of packages are simultaneously wound upon a plurality of cores driven by a common shaft, the various packa es frequently show differences as a result of the variations in the friction systems connecting the common driving shaft with respective cores, the greatest deviations being attributable to differences in wear in several friction connections.

It is the primary object of the present invention to provide an improved drive connection be.- tween a driving shaft and a winding core which is characterized by a greatly reduced fluctuation in slippa e whereby variations in tension Of the tape during windingare minimized or eliminated.

An ancillary bject of the p e n inv n on i to provide an improved system for wmding a plurality of tapes or the like simnitaneously char actfi z n the production Q? a grou o pa ages which are substantiallyidentical in density ndapp aranc i A further object is to provide an improved 23, at least one of which is positively driven, preferably at constant speed. While the present n n io i adapts t p ate 1. 1 an tr or sheet of ate l. it is pa icula y useful the slitting of a sheet carrying a coating on one surface thereof of a pressure sensitive adhesive and when such a material is handled, that one of the rolls 22 and" 23 which bears against the pressure-sensitive adhesive-coating is preferably ridged to reduce the area of contact. The sheet 2% then proceeds past the operating stage 24 which in the specific instance shown is a slitting operation. The sheet proceeds about a hard steel roll 25 with which one or more axial- 1y spaced slitter knives 26' monn=ted on a rotating core 2'? is or are provided for slitting the sheet into the desired number of narrower widths. The individual widths may be the same or, if de i ed d f e ent W dths a h m the sheet 29 by suitably spacing the knives 26. If d h tra t on Q t e ll v ma s ve a t ol fe n d v c Wh Q nt r 1 .2?

and 23' ma h q aiii dxa i hich case th roll 25 and the knives 26 are positively driven, pre b yat. o s anispeed.

From the slitting operation 25, one group of alternate tapes 33 is drawn to a plurality of cores mounted on the driven shaft A and the intervening tapes 29 proceed to similar cores mounted on shaft B. Shafts A and B are driven at a speed in excess of the speed required to takeup the tapes which are delivered by the feeding means, such as the slitter system or feed rolls 22 and 23. For example, shafts A and B may be driven at a constant speed or at a speed varying with the diameter of the winding but in all cases at a suflicient rate to tension the tapes during their winding.

Each of the cores 3 is mounted upon a system comprising a magnetic element 1 which is mounted in fixed position on the driven shaft such as A and one or more magnetic elements, e. g. t and 5, rotatable on the shaft, there being a friction member, e. g. H or E2 interposed be tween the magnetic element 1 and the magnetic element or elements It and 5.

The magnetic elements may be made of any magnetic material, such as iron, steel or a magnetic alloy thereof. The element "l and the elements i and may be magnets, at least one of the magnetic elements must be a magnet, either permanent or an electromagnet. Preferably element l is a permanent magnet. As shown, the magnet l is secured in fixed position on the shaft A by means of the set screw 9 which engages in a keyway it) of the shaft. The core 3, which may be of wood or cardboard, may be releasably held upon the outer periphery of the discs or plates 3 and 5 such as by means of the thin steel blades 6 which are set within recesses in the outer peripheries of the discs l and b and may have a short protruding portion for engaging the inner periphery of the core. The magnet i may be provided with annular grooves 8 in the opposite lateral faces thereof and friction rings ii and [2 may be disposed in these grooves and project outwardly therefrom a short distance. The friction rings may be any suitable hard felt or any other material such as hard or soft metal capable of exerting a controllable friction between the discs 4 and 5 and the rings It and i2 respectively against which the rings bear. Instead of having complete rings H and 12 of felt or other fiction material, there may be used instead a plurality of arcuate sections of a ring, such as three equi-angularly spaced, equally sized, arcuate sections secured in corresponding arranged complementary recesses within each lateral surface of the magnet.

This mounting unit so far described is the essence of the present invention. It should be noted that the frictional areas between the rings H and i2 and the plates 3 and 5 respectively are relatively small as compared to the available area that could be provided for frictional engagement between the magnet and magnetic element or elements. The magnetic coupling force is of prime importance and cooperates with the relatively small frictional forces to provide a drive coupling between the shaft and the core which is substantially free of fluctuations resulting from variations in the slippage along the friction areas. The friction rings H and i2 project out of the annular recesses B a predetermined small distance so that a strong magnetic coupling force is exerted between the magnet i and the elements 41 and 5, the magnetic coupling force preferably being greater than the frictional force.

Optionally, the following auxiliary means may be provided for increasing both the frictional force and the magnetic coupling force between the drive shaft and the winding core. This auxiliary means may consist of a pair of yokes it and it disposed on opposite sides of the magnetic elements t and 5. The terminal ends of the yokes i3 and is are recessed as at its. and these recesses receive friction plugs or pads I? which project a small distance out of the surfaces of the yokes l3 and i and are adapted to bear against the outside lateral surfaces of the magnetic elements 3 and 5. The yokes i3 and it are provided at their lower ends with inturned ears i300 and Ma respectively which are hinged upon a pin i5 secured in a fixed position in the rod or bar it by means of set screw tea. The terminal ends i322 and Mb of the yokes l3 and M respectively are provided with internally threaded bores of opposite hand and within these bores the double ended screw is having threads of opposite hand is received. Midway of tie screw it there is provided a knurled knob i9 rigidly secured by a set screw 59a so that rotation of the knob 59 either spreads the ends 83b and Nb apart or moves them closer together thereby either relieving or increasing the pressure of the plugs ll against the magnetic elements It and 5. This increase in pressure tends to compress the friction rings if and 12, thereby reducing the space between the magnet and magnetic elements and and increasing the magnetic coupling somewhat in addition to the of increasing the frictional force.

The use of the auxiliary means comprising the yohes l3 and it has the additional advantage of enabling the operator to make individual a j ments in the several winding core mounting s stems upon any given driven whereby differences in frictional or magnetic coupling forces may be compensated for in order to produce simultaneously a plurality of packages having substantially the same characteristics of density, size, and appearance.

The density of the fe friction rings ii and it may be preselected to give any desired compressibiiity so that adjustment of yoses i3 and it can produce any desired variation in the magnetic coupling force as well as in the frictional coupling force between the driving shaft and the winding core or cores.

While the invention has been shown in connection particularly with an operation for slitting a wide sheet to a plurality of narrow widths which are wound up individually, the winding system of the present invention may be employed for the take up of any strip of material whatsoever, regardless of its width, and re the purpose of rewinding. For example, the rewinding may be solely for the purpose of converting a poorly shaped wound package to a uniformly shaped Wound package or it ma be for the purpose of drawing the strip or me like through a coating, humidifying, drying, or other treating operation or through a series of such treatments.

It is to be understood that changes and variations may be made without departing from the spirit and scope of the invention defined in the appended claims.

I claim:

1. A winding machine comprising a driven shaft, an annular magnet secured concentrically to the shaft in fixed position for rotation therewith, a pair of annular magnetic members disposed rotatably on the shaft on opposite sides of the magnet, annular grooves in the magnet disposed concentrically with respect to the shaft, friction rings disposed in said grooves and projecting outwardly therefrom a certain distance to provide frictional bearing surfaces against which the magnetic elements are held by the magnetic coupling force between the elements and the magnet, an annular winding core, and means for releasably securing said core to the outer peripheries of said magnetic elements.

2. A winding machine comprising a driving shaft, a core upon which a material is to be wound, magnetic and frictional coupling means between said shaft and core, said coupling means comprising at least two magnetic elements, at least one thereof being a magnet, means for securing one of said elements to the shaft, means for securing another of said elements to the core, and a friction member disposed between said shaft element and said core element, and stationary means for applying pressure in an axial direction to the core element to adjustably urge the elements towards each other.

3. A winding machine as defined in claim 2 in which the adjustable means comprises at least one yoke straddling said shaft, a pivotal mounting for the yoke, said mounting having an axis at right angles to the axis of the shaft, and means for urging the yoke axially against the core element.

4. A winding machine comprising a driving shaft, a core upon which a material is to be wound, and magnetic and frictional coupling means between said shaft and core, said coupling means comprising at least two magnetic elements, at least one thereof being a magnet, means for fixing one of said elements upon the shaft, and a friction member disposed between said magnet and another magnetic element, means for urging the magnet elements toward the magnet comprising a pair of yokes disposed on opposite sides of the elements and straddling the shaft, friction pads carried by the yokes and held by them against the magnet elements at areas on opposite sides of the shaft symmetrically disposed with respect to the shaft, said yokes being mounted on a common pivotal axis offset from the shaft and extending at right angles to a plane through the shaft, and screw means for swinging the yokes about said pivotal axis.

5. A winding machine as defined in claim 4 in which a plurality of other similar core supporting systems are mounted on said shaft for winding up a plurality of materials simultaneously, one on each of said cores, said machine comprising a bar offset from the shaft and extending approximately parallel thereto, a plurality of parallel pins mounted on said bar in fixed spaced positions along said bar to provide the pivotal axes of the respective pairs of yokes.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,877,440 Adatte Sept. 13, 1932 1,982,461 Winther Nov. 27, 1934 FOREIGN PATENTS Number Country Date 225,247 Germany Sept. 5, 1910

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