DE2255607B2 - REEL CORE - Google Patents

Description

The invention relates to a winding core, in particular for winding sensitive thin plastic films, consisting of an outer winding ring and one concentric inside the winding ring to arranged receiving ring and both rings connecting elastic connecting members.

This allows narrow material webs in long lengths in a simple and convenient way for further assembly can be handled, they are wound onto winding cores in a known manner. to For this purpose, the winding cores are taken up on corresponding winding core mounts. The winding core recordings are, especially with narrow material webs, one behind the other on a driven one Arranged shaft. The web of material under tension when being wound onto the winding core causes forces acting radially inwards due to the addition of the winding forces on the circumference. These radial forces deform the winding core in such a way that after the winding process it is often only below hard mechanical stress, e.g. B. by blows, released from the winding core holder and when subsequent processing as a result of the deformation of the receiving ring no longer on a other recording of the same size can be pushed.

So winding cores made of plastic for winding narrow webs of material are already known which one tries to make the winding core as stiff and dimensionally stable as possible in the radial direction. Such circular winding cores have a rectangular cross-section in the area of the circumference or I-shaped profile, the I-shaped profile on The scope is often additionally provided with radially arranged reinforcing ribs. Such Solution is generally regarded as unsatisfactory because the rigid and dimensionally stable properties only result from large Cross-section heights and the resulting increased use of material are to be achieved. By Increasing cross-section height, however, swings valuable things with the required outer winding diameter Winding volume, so that based on this requirement of the cross-sectional height limits are set and a dimensionally stable winding core is not achieved.

It has also already been proposed to distribute tracks evenly on the circumference of a receiving ring Wind up the spring ribs to allow the individual layers of the roll to be telescoped or moved Avoid (DT-AS 11 68 204). Here, however, the strength of the winding is due to the flexibility of the Limited spring ribs. Sensitive, thin, narrow webs are made by the ends of stiff spring ribs injured and stretched and embossed by the polygonal winding. Ensure that the spring ribs are too soft on the other hand, no secure and tight winding.

A winding core known from US-PS 28 68 475 consists of a winding ring and one inside the same concentrically arranged receiving ring, which are connected to one another via elastic connecting links are connected. According to one embodiment, the connecting links are straight and extend tangential to the receiving ring. In another embodiment, the links extend in the radial direction and point approximately in the middle between the receiving ring and winding ring a kink in the circumferential direction. The force acting on the winding ring when the material is being wound is with the help of the elastic connecting members in the manner on the receiving ring in the circumferential direction transmitted that this is set in relative rotary motion to the winding ring. The force acts in the essentially tangential. The diameter of the mounting ring is deformed in the process.

The invention is therefore based on the object of creating a winding core on the narrow Material webs can be firmly wound onto the winding ring and the receiving ring is dimensionally stable remains and a safe and easy removal of the wound core from the core holder is guaranteed.

This object is achieved according to the invention in that the elastically resilient part of each connecting member has the shape of a portion of a circular ring which is arranged concentrically to the core axis is.

This particular shape and arrangement of the connecting links in the space between the winding ring and Retaining ring interrupts the flow of force from the winding ring to the retainer ring when winding Material webs on the winding core Forces act on the winding ring. The elastic links absorb the force radially, the receiving ring is only with the reaction forces of these connecting links burdened. As a result of the resulting low load on the mounting ring, it remains largely exact shape. The special design of the winding core makes it insensitive to axial and forces acting in the tangential direction, d. H. opposite torques transmitted to the winding core.

One advantage over a winding core with spring ribs is that the narrow material webs are firm can be wound onto the take-up ring without being injured. The problem of the Telescoping does not occur here because the air is fast enough when winding narrow webs of material can escape laterally to the outside and thus there is no between the individual layers of the roll Cushions of air can form, which ultimately cause telescoping.

The fact that the receiving bore of the receiving ring remains dimensionally stable before and after winding is An easy, safe pick-up and take-off of the winding cores on and from the winding core holder at all times guaranteed before and after winding the cores. Cores that have already been wound no longer have to pass Impacts are released from the winding core receptacle, with the sensitive winding and / or winding core receptacles often get damaged.

The invention will now be briefly explained again in a preferred embodiment with reference to the drawing.

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They represent:

F i g. 1 shows a view of a preferred winding core with a winding,

F i g. 2 shows a longitudinal section through the preferred winding core according to FIG. 1 with winding and

3 shows a longitudinal section of a winding core with each a receiving ring located on the front side, also with a wrap.

The in F i g. 1 and 2 consists of a winding ring 1, a concentrically arranged receiving ring 2 and the elastic connecting links 3 evenly distributed between them on the circumference forces acting on the winding core. The winding ring 1 deforms more or less much under the influence of these forces. The elastic connecting members 3 are arranged in a tangential form between the winding ring 1 and the receiving ring _{; o} 2 and in this position best absorb the deformation of the winding ring 1, so that the receiving ring 2 is only extremely lightly loaded and the receiving bore 6 in the permissible tolerance remains dimensionally stable. The connecting links 3 can also be S-shaped or Z-shaped if they meet the properties described above and remain largely rigid in the axial and tangential directions. The elastic connection between the winding ring 1 and the receiving ring 2 can also consist of only one circular ring-like connecting member 3, which is also able to absorb the radial deformation of the winding ring 1.

Another winding core design is shown in FIG. 3, which in principle corresponds to that shown in FIG. 1 and 2 shown winding core is similar with the exception that the winding ring 1 is wider and that the elastic connecting links 3 are only connected to a receiving ring 2 on both of its front sides. This winding core design is intended for correspondingly wider material webs.

The winding core according to the invention is preferred for material webs with a width of £ 40 cm used, in particular in the range from 2 to 20 mm and consists primarily of plastic, the Connecting links 3 can also consist of any other elastic material.

1 sheet of drawings

Claims (1)

Claim: Winding core, in particular for winding sensitive thin plastic films, consisting of from an outer winding ring and one inside the winding ring concentric to it arranged receiving ring and both rings connecting elastic connecting members, d a by characterized in that the resilient part of each link (3) has the shape a portion of a circular ring which is arranged concentrically to the core axis.