DE4309062C2 - Winding shaft with core carriers - Google Patents

Description

The invention relates to a winding shaft for tensioning one or more cores on one or more, side by side in the axial direction core carriers arranged on the winding shaft and for generating a torque for winding Winding material, in particular self-adhesive tapes, the Core carrier each has a base body in which a or more clamping elements on one or more pressure pieces a torque-initiating support body for transmitting the torque to press.

The winding of individual tapes on cores that are individually or arranged in groups on winding shafts and individually attached are driven, is known, such a core carrier has to meet the following requirements:

• - Tension the core at a defined point.
• - Transfer reproducible winding torque.
• - Good runout.
• - No damage to the core when sliding over the Core support.
• - Long life span.
• - Low maintenance.

Systems are known that only address these areas meet conditionally. So is from DE-OS 27 34 978 a wrap shaft with several, in the axial direction side by side arranged bobbins that can be rotated independently stored on the winding shaft and frictionally ver are bindable for simultaneous winding of several tapes knows, with each winding tube assigned a spring element is through which the frictional connection between the winding shaft and winding tube can be produced.

In this winding shaft are in one or more recesses Wound sleeve clamping pieces guided by a leaf spring against the Winding shaft can be pressed, the leaf spring with the winding tube connected by a screw to adjust the spring force that is. Such a winding shaft should be especially when driving the winding that winds up the magnetic tapes cores of several magnetic tape casings arranged side by side have proven successful. By means of the spring elements for each Winding sleeve that is in the toothed center opening of a winding core engages, the maximum allowable tension of the magnet bandes set from the to the winding tube from the winding wave is no longer taken. Between neighboring However, there is no frictional connection between the winding cores dung, so that these are independent of each other in their rotation are. This prevents, for example, that in the case of blocking one winding core, the winding process for all others Cassettes is also interrupted or disturbed.

DE-OS 39 18 863 has a winding shaft for several ranked sleeve-shaped winding cores, each of which at least  a friction element is assigned, which by changing the Pressure in at least one arranged in the winding shaft Pressure medium hose with radially adjustable friction body points, known. Each friction element has at least one axially displaceable on the winding shaft and fixed on it settable outer ring and a rotatably mounted support ring on the inside of which the radially adjustable, pressurized by the pressure hose or hoses Friction body and on the outside over the outer circumference of the support ring adjustable and lockable clamping elements are arranged. So that a winding shaft should be obtained by means of simple means both a sensitive adjustable frictional connection between the wrap shaft and the winding cores during winding is possible, as well as shifting the friction lock transfer supply mechanism is feasible without the one position of the friction lock must be adjusted. This is supposed to can be achieved in that between two laterally ge placed outer rings arranged on its outer side several eccentrically distributed over the circumference has clamping surfaces running to the winding axis, while on the inside of the clamping elements with the clamping surfaces of the Support ring cooperating projections are arranged.

A core adapter for attaching a tubular core on a rotatable mandrel and for application a slip of the core relative to the mandrel writes DE-OS 20 24 336. This core adapter comprises a cylindrical body which by means of a plurality of Ball bearings is attached to a mandrel, whereby the body is provided with a device through which one Friction coupling of the body with a core is achieved and the mandrel supports a device with which a  opposing axial pressure on the inner and outer Races of the bearings for the purpose of controlling the on a Material tape while winding it onto the core kenden angular tension is exerted. The well-known wrap shafts have in common that no bushings are provided, so that the problem of a core misalignment is not solved.

In the abstract of Japanese Patent JP 1-13 350 it is stated that in order to To achieve exact centering of the winding on the shaft, a split ring is used becomes. This ring is held elastically in a groove on the outer surface of the Hub is provided. The outer surface of the ring is attached to the rubber rings inner edge of the roll pressed out of the tape to be wound. This will make one axial movement of the winding on the hub is suppressed, thus ensuring a very good winding to achieve the tape.

Another possibility of axial fixation is described in US Pat. No. 2,704,681 a socket that can serve as the core of a winding. A wave with one square-shaped end is also in a square-shaped recess of the Bush inserted so that the driven shaft this bush when it rotates takes along. In order to suppress axial play of the bushing, there is a at the end of the shaft Steel ring is provided, which is fixed concentrically on the shaft by an O-ring. Both the steel ring and the O-ring located between the shaft and the steel ring are in a groove provided for this on the shaft. The steel ring is connected to four by the O-ring Put pressed on the inner surface of the recess of the socket, with which a frictional connection between the shaft and the bushing, there is an axial movement of the bushing on the shaft makes impossible.

The object of the present invention is a small one Weight winding shaft with core supports of the type mentioned to create where no core displacement is possible, the one has a long service life with minimal wear and tear enables a good concentricity of the core.

This object is characterized in that in claim 1 Features resolved.

In the core carrier designed according to the invention are on the Winding shaft axially clamped several liners, each Basic body freely rotatable on the liner assigned to it is held. This is in a recess in the base body by means of the clamping element radially against the liner ge pressed pressure piece arranged, the clamping element as Snap ring or as a closed elastic, the pressure piece is formed on the sleeve pulling ring. About torque is applied to the core is a slotted, Clamping ring pressed outwards via two elastic rings intended. With such a trained according to the invention The following advantages are achieved with the winding shaft with core carriers:

• - No core misalignment is possible because the core carrier when opening push the cores because of the stable leading edge of the barrel can not move.
• - The winding torque is reproducible for each individual Core carrier, since there is no mutual influence is.  
• - Pushing the cores on and off is not damaged possible because there is a fully load-bearing surface and the elasticity for the core by selecting the elastic Rings and the installation dimensions can be optimally designed.
• - For long winding shafts there are any number of center supports against deflection can be carried out easily because the collar of the Liner can be designed as a bearing.
• - There is a long life because of the clamping forces for the core through the elastic rings over a very remain constant for a long time and wear the pressure piece is very low.
• - The core carrier is low-maintenance and easy to repair, because clamping ring, elastic rings, pressure piece and clamping element can be replaced without disassembling the winding shaft. The dismantling of the complete winding shaft is also very easy fold, since the liners only have to be pushed off after where the axial bracing is removed.
• - For manually moving winding shafts is a considerable Ge weight saving to realize, as a winding shaft thin-walled tube can be used.
• - A good concentricity of the core is given, because the clamping ring always expands centrally via the elastic rings or is pressed together centrically.
• - The core carrier is especially for small core diameters suitable because only little installation space is required. The described bene embodiment was z. B. for core inner diameter selected from 26 mm.
• - The clamping element is a very simple part. It will be before preferably made from a standardized snap ring. The The thickness of the snap ring determines the pressure force on the Thrust piece and thus the torque generated. By abrasion fen the thickness of the snap ring is very easy and achieve the desired torque reproducibly.
• - All parts are preferably rotationally symmetrical, so that  vibrations largely eliminated at high speeds become.

Further refinements of the invention are in the sub claims marked.

An embodiment of the invention is described below the drawing explained in more detail. Show it

Fig. 1 shows schematically a longitudinal section through a winding shaft with a plurality of cores supporting core and

Fig. 2 is a radial section along the line II-II in FIG. 1.

According to Fig. 1 a plurality of core support are arranged on a winding shaft 1. The bushings 2 are axially clamped on the winding shaft 1 . The base body 3 is freely rotatable on the liner 2 . In a recess of the base body 3 be the pressure piece 4th It is pressed radially against the liner 2 with a clamping element 5 .

Upon rotation of the bushing 2 in the base body 3 on the pressure piece 4 as well as on the opposite bearing surface of the base body 3, a frictional force and thus a torque is produced. The slotted clamping ring 7 is used to transmit the torque to the core 8 of the winding material 9 , which is pressed outwards via two elastic rings 6 and tensions the core 8 .

The collar 10 of the liner 2 is designed as a bearing for supporting the winding shaft.

In the embodiment described here, the clamping element 5 is a semicircular spiral spring with a rectangular cross section ( FIG. 2). The tensioning element 5 is preferably produced from a standardized snap ring. The thickness of the snap ring determines the pressure force on the pressure piece 4 and thus the torque generated. By grinding the thickness of the snap ring, the desired torque can be achieved very easily and reproducibly.

Claims (7)

1. winding shaft ( 1 ) for tensioning one or more cores ( 8 ) on one or more core carriers arranged side by side on the winding shaft ( 1 ) in the axial direction and for generating a torque for winding up winding material ( 9 ), in particular self-adhesive tapes, wherein the core carrier each has a base body ( 3 ) in which one or more clamping elements ( 5 ) or one or more pressure pieces ( 4 ) press on a torque-introducing support body for transmitting the torque, characterized in that a plurality of bushings on the winding shaft ( 1 ) ( 2 ) are axially clamped, each base body ( 3 ) on the associated bushing ( 2 ) is freely rotatable, that in a recess in the base body ( 3 ) by means of the clamping element ( 5 ) radially against the bushing ( 2nd ) ge pressed pressure piece ( 4 ) is arranged that the Spannele element ( 5 ) as a snap ring or as a closed elastic, the pressure piece ( 4 ) is formed on the sleeve ( 2 ) pulling ring and that for transmitting the torque to the core ( 8 ) a slotted, two elastic rings ( 6 ) on the base body ( 3 ) and this ( 6 ) pressed out clamping ring ( 7 ) is provided. 2. Winding shaft according to claim 1, characterized in that the pressure pieces ( 4 ) press radially onto the bushing ( 2 ). 3. Winding shaft according to claim 1, characterized in that the pressure pieces ( 4 ) axially press on the bushing ( 2 ). 4. Winding shaft according to one of claims 1 to 3, characterized in that the bushings ( 2 ) each have a collar ( 10 ) for separating the core carrier transmitting the individual friction. 5. winding shaft according to claim 4, characterized in that the collar ( 10 ) of the sleeve ( 2 ) is designed as a bearing for supports of the winding shaft ( 1 ). 6. Winding shaft according to one of claims 1 to 5, characterized in that the material pairing between the liner ( 2 ) and the pressure piece ( 8 ) is steel / plastic. 7. Winding shaft according to one of claims 1 to 6, characterized in that the winding shaft ( 1 ) is designed as a thin-walled tube.