MXPA97000133A

MXPA97000133A - Cubo de embobinadopara carriers of information similar to ci

Info

Publication number: MXPA97000133A
Application number: MXPA/A/1997/000133A
Authority: MX
Inventors: Thiele Hartmut; Lutz Gottfried; Schneider Alfred; Liepold August; Scholtysik Bernd
Original assignee: Basf Magnetics Gmbh 68165 Mannheim De
Priority date: 1994-07-04
Filing date: 1997-01-07
Publication date: 1998-01-01

Abstract

The present invention relates to a winding hub for information carriers similar to tape has elastic elements placed between the inner and outer rings to ensure a compression range of less than 1: 4 between the internal and external diameters. In order to increase the clamping forces of the winding hub during the winding, elements are associated with limitations that act in radial direction with the resorption elements.

Description

EMBOBINED CUBE FOR INFORMATION CARRIERS LIKE A TAPE.

The winding wheel core for information carriers in the form of a strip or tape, the width of the outer winding surface of the winding wheel core corresponding to at least the width of the information carrier, the winding wheel core comprises an outer ring and an inner ring, which are radially interconnected by elastically deformable spring elements which run radially in the circumferential direction, in order to prevent a relative movement of the outer ring with respect to the inner ring in the circumferential direction of the latter, and the The winding impeller core has an inner circumference and an outer circumference with the inner and outer diameter, respectively, the winding impeller core has a compression ratio of the internal diameter compressed to the compressed external diameter of less than 1: 4, during the information carrier winding . Patent No. DE-U 9400220 discloses the winding impeller core described above with spring elements that lend thereto a certain elasticity in the radial direction.

This coil winding core is used to wind magnetic tapes after cutting and the coiled winding coil core is supplied to companies that load the cassettes or companies that record the cassettes. These companies assemble the winding impeller cores in winding machines, which are coupled to the individual winding impeller core by means of a winding mechanism and clamp the impeller core from the inner circumference. These winding mechanisms have a limited clamping displacement. The inner ring of the winding wheel core expands resiliently by the mechanism and offers little resistance to this resilient expansion. As a result, the winding wheel core is not retained with the necessary firmness in the mechanism and accidents may occur due to the separation and detachment of the ribbon roll and / or the impeller core. An object of the present invention is to provide a winding wheel core of the type mentioned at the beginning which has a suitably secure assembly. We have found that this object is achieved by means of the winding wheel core for information carriers in the form of a strip or tape, the width of the outer winding surface corresponding to the winding wheel core at least up to the width of the winding carrier. information, the winding wheel core comprising an outer ring and an inner ring which are radially interconnected by elastically deformable spring elements which run radially in the circumferential direction, in order to prevent a relative movement of the outer ring with respect to the inner ring in the circumferential direction of the latter, and the winding wheel core having an internal and external circumference with an internal and external diameter respectively, the winding wheel core has a compression ratio of compressed internal diameter to compressed external diameter of less than 1 : 4 during the roll of the information carrier, whose core The winding impeller comprises limiting elements which [lacuna] are placed in a centrally symmetrical manner and act essentially radially and in the case of an enlargement of the diameter (expansion) of the inner ring limit the latter. In a first practical design, the effective spring length of at least some of the spring elements is reduced to be more precise by shortening, by means of the limiting elements, which results in an increase in force transfer between the inner ring and the outer ring. The stiffness of the spring is increased and the "elasticity" becomes harder. In a second practical configuration, in case of a defined enlargement of the diameter (expansion) of the inner ring, an internal ring support in the outer ring is estahed by means of the limiting elements. Both solutions provide the same result, namely, a limitation of any enlargement of the inner ring diameter. This achieves the effect that, by means of which in each case there is a relatively simple modification where the operating reliability of the coils of the winding runner is considerably increased. In an advantageous design, the spring elements They comprise essentially "S" -shaped webs with a circumferential part and radial parts at the ends. The circumferential part of the "S" shaped continuous tapes can be quickly placed on the angular scale from about 85 ° to about 95 ° relative to a radius of the winding wheel core.

In an advantageous development, the limiting element is designed as a continuous limiting belt which is connected to the circumferential part of the spring element, running in the circumferential direction, up to the inner ring of the winding wheel core. In a further development, a limiting stop provided in one of the inner or outer rings may be provided as a limiting element. It is achieved by means of continuous tapes or stops that, in the case of an enlargement of the diameter (expansion) of the inner ring of the winding wheel core, the displacement involved by the enlargement of the inner ring diameter of the winding wheel core, the displacement involved by enlarging the diameter [sic] is limited and as a result, it is ensured a minimum holding force of the impeller core winding. In a further development of the invention, the effective spring constant of the spring element can be graduated by a different exposure of the limiting continuous ribbon through the length of the circumferential part between the radial particles [sic] of the spring element. As a result - in addition to the limitation of the intended displacement - the spring stiffness of the spring elements of the winding wheel core can, therefore, be generally graduated as desired. A divisible number between 3 of the spring elements and limiting elements is convenient. The winding wheel core may advantageously consist of thermoplastic material without any content or at most with a very small content of filler or filler. 0 The thickness of the limiting bands can correspond to approximately half the thickness of the spring elements. In a specific design, each spring element can also be assigned to a limiting element. 5 In a further design, at least, three limit elements designed as "." Limit stops may be provided. The embodiments of the winding impeller cores according to the invention will be described below and are represented by the drawing, wherein: Figure 1 shows a winding impeller core with limiting continuous tapes. Figure IA shows a 5-section representation of the winding wheel core according to Figure 1 on the intersecting line A-A. Figure 2 shows a coil winding core with limit stops. Figure 2a [sic] shows a sectional representation of the winding wheel core according to Figure 2, on the line of intersection B-B. Figure 3 shows a winding mechanism 0 with a coil winding core. In Figure 3, a winding impeller core 5 is mounted in a mounting mechanism 6 of a winding device, for example, for the production of blank cassettes. The core of the winding wheel 5 is retained by means of three projections 7, which move with The pressure, radially outward, for example, towards the recesses 9 impellers of the winding wheel core by the tilting movement of an articulated staple 8. The three protrusions can also rest against different points on the inner circumference. The number 7A represents the position of the projections in the rest position. The radial pressure of the mounting mechanism 6 causes the inner ring 10, which is connected to the outer ring 12 with spring elements 11 of "approximately S" shape between them to expand circumferentially. Without the measures according to the invention, which are still to be described, under certain circumstances, the retention force of the winding wheel core 5 may not be adequate during the assembly operation, since the inner ring yields which may ^ result in the impeller core 5 of winding is separated at high rotation speeds. Figure 1 shows a winding impeller core 15 which differs from the winding impeller core 5 where the spring elements also "S-shape" approximately 11, which comprise a longer circumferential part Ia and the "approximate approximate radial portions" t "11b are connected through a continuous band 13 limiting with the inner ring 10 of the impeller core 15 of winding. In Figure 1, the The continuous tape 13 is approximately half the thickness of the thickness of the spring elements 11 and is also radially placed somewhat to the right of the center radius rm of the spring element (all quadrants are separated from the quadrant in the upper right). He quadrant on the upper right, three different arrangements of the continuous band 13 limiting as 13A are represented in the vicinity of the radial part on the right hand side and as 13B in the vicinity of the radial part of the left hand in order to show that the spring force can be varied from about 10 percent (13A) to about 90 percent (13B) by selecting the disposition of the continuous tape limiter. Consequently, if no limitation of the ^ Circumferential spring displacement, the force of The spring of a winding wheel core can thus be properly adjusted to the shape of the unaltered spring elements 11 without any difficulty. In Figure IA, the impeller core of The winding is shown in cross section according to the line of intersection -A in Figure 1. r ^ The mentioned continuous tape 13 can be shaded. The continuous reinforcement tapes 19 can be provided in the inner ring 10 either in the spokes where the continuous tapes 13 of limitation or elsewhere are placed additionally on the spokes where the radial portions 11b face inwardly of the spring elements 11 remain. It can be seen in the same as the outer ring 12 has a double "T" structure that makes it possible to achieve good strength together with low weight and that uses a thermoplastic material without glass fibers in any other filling or loading material. The inner ring 10 can, on the other hand, be a solid design and also as shown [lacuna] with corresponding pressure projections 14A and 14B, respectively for stacking a plurality of coils of winding wheel 15 on top of each other. Figure 2 shows, as a variant according to the invention, a core of winding runner 20 which is designed with limit stops 16 in each case placed on the spokes of the recesses 9 impellers. The limit stops 16 are configured with a width a of about 2 millimeters and have a slot 17 (which can be seen in Figure 3A) with a ^ ~ _ width of predetermined slot, which depends on the displacements of subjection and the tolerances of the mechanisms of assembly in the market. In general, the width 0 of the slot can be from about 0.2 to about 0.5 millimeter. The winding wheel core configurations according to Figures 1 and 2 were tested with respect to their holding force in a mounting mechanism of the Tapematic company of Italy. The coil winding cores to be measured were assembled normally and connected with 5 tension wires each offset to 120 °. The tension wires were connected to each other and a modified spring balance was set at the connection point. The tension direction of the spring balance ran in the central axis of the winding impeller core away from the winding mechanism. In the case of a winding impeller core 15 according to Figure 1 with a limiting stop 13 assigned to each spring element 11, a tension force of approximately 6 p 5 had to be supplied until the impeller core was released. of winding. In the case of a coil winding core 20 according to Figure 2, with three limit stops 16, with approximately b = 0.2 millimeter or slot width, a peel force of about 5 kp was required. In comparison with this, in the case of the winding impeller core 5 according to Figure 3 and none of the limiting elements, a very low detachment force 5 of about 4 kp was measured.

The thickness of the spring elements which, in addition to the "approximately S shape" of the elements 11 may have other shapes as described and shown in the Patent Number DE-U 9400220, must be at least 5. approximately 0.6 millimeter, the normal thickness of approximately 1.0 millimeter and must have a width that corresponds essentially to the width of the winding surface 18. The circumferential portions of the "S-shaped" spring elements 0 can be positioned, for example, with respect to a radius of the winding wheel core on an angular scale of about 85 ° to about 95 °. By optimization, the values of the release forces of the winding impeller cores 15 and 20 according to the invention can undoubtedly be further increased. In any case, it was thus possible to establish a considerable increase in the peel forces by approximately 50 percent and 25 percent, respectively with respect to the core of the comparison winding 5. It is possible to use appropriate continuous tape forms together with appropriate thermoplastic materials 5 which can be processed by the injection molding process. These thermoplastics should not contain any fillers or fillers, such as glass fibers, glass beads, and other fillers or reinforcing fillers. For winding winding cores in accordance with the present invention, thermoplastics are generally suitable in particular the thermoplastics listed below: polystyrene, ABS (acrylonitrile / butadiene / styrene copolymers) in admixture with terephthalates of polyethylene with a polycarbonate. PVC (polyvinyl chloride) polyamide. 5 During the winding of the magnetic tape in the winding impeller cores 5, 15 and 25, a compression ratio of ? Di 1 Di = diameter of the inner ring 0? DA [sic] 4 Da = diameter of the outer ring has shown that it is the maximum tolerable ratio because this allows the coil winding cores once they have been wound up to still be able to detach from the spindle where the winding coil core was provided with the roll of tape at speeds of very high winding. To further simplify the detachment of the winding wheel cores with the rolls of tape 5 placed therein, a ratio of 1: 5 The coil winding cores 15 and 20 according to the invention or similar configurations further have the advantage that, when the magnetic tapes are unrolled in the customer's premises, the coil winding core can not be separated in a non-detachable manner. intentional assembly and winding mechanism and cause problems. A coil winding core for 5 tape information carriers is designed with spring elements between the inner ring and the outer ring to provide a compression ratio from the inner diameter to the outer diameter of less than 1: 4. To increase the retention forces of the winding wheel core during winding, the spring elements are assigned limiting elements.

Claims

R E I V I N D I C A C I O N E S:

1. A coil winding core for information carriers in the form of a strip or tape, the width of the outer winding surface (18) of the coil winding core corresponds at least to the width of the information carrier, the impeller core of winding comprises an outer ring (12) and an inner ring (10), which are radially interconnected by elastically deformable spring elements (11) running radially in the circumferential direction, in order to prevent relative movement of the ring (12) external with respect to the inner ring (10) in the circumferential direction of the latter, and the core of the winding wheel has an internal and external circumference with an internal and external diameter respectively, the core of the winding wheel (5, 15, 20) has a compressed internal diameter compression ratio (? Di) to compressed external diameter (? Da) of less than 1: 4 during winding of the information carrier, whose winding wheel core comprises limiting elements (13, 16) which are positioned in a centrally symmetrical manner and act essentially radially and the spring action of at least some of the elements (11) is reduced by means of the limiting elements (13) so that in the case of an enlargement of the diameter of the internal ring (10), the latter is limited.

2. The coil winding core of 5 according to claim 1, wherein in case of a defined enlargement of the inner ring diameter (10), a support of the internal ring (10) is established with respect to the external ring (12) by means of the elements "< »(16) limiters.

3. The winding wheel core according to claim 1, wherein the spring elements comprise continuous strips (11) essentially S-shaped with a circumferential part (lia) and radial portions (11B) at the ends.

4. The winding wheel core according to claim 3, wherein the circumferential part (lia) of the S-shaped webs (11) is positioned within the angular scale of about 85 ° to about 95 °. in relation to 20 a radius of the winding wheel core (5, 15, 20).

5. The winding wheel core according to any of claims 1 to 3 or 4, wherein the limiting element is designed as a A continuous tape (13) limiting connecting the circumferential part (lia) of the spring element (11) running in the circumferential direction with the inner ring (10).

The winding wheel core according to a waveform of claims 1 to 2, wherein the limiting element is designed as a limiting stop (16) that is provided in the inner ring (10) or ring (12) external.

The winding wheel core according to one or both of claims 1 or 2 [sic], wherein the limiting element is designed [sic] as the limiting stops (16A, 16B) that are provided on the ring ( 10) internally and in the outer ring (12).

8. The winding wheel core according to claims 5 and 6 or 5 and 7, wherein the limiting continuous tapes (13) are provided which in each case connect the circumferential part (lia) running in the circumferential direction of the spring element (11) with the inner ring (10) and wherein the limit stops (16A, 16B) are further provided, which are provided in the inner ring (10) and / or in the outer ring (12).

9. The winding impeller core according to claims 6 to 8, wherein a slot (17, 17 ') is provided having a slot width of between about 0.15 to about 0.4 mm between a limiting stop (16, 16A, 16B) and the opposite part of the winding wheel core.

10. The winding wheel core according to any of claims 3 to 5 or 8, wherein the spring constant of the spring element (11) can be graduated by different arrangements of the continuous limiting tapes (13, 13A, 13B) through the length of the circumferential part (HA [sic]) between the parts radial (11B [sic]).

11. The winding wheel core according to one or more of claims 1 to 10, comprising a number divisible by 3 of spring elements (11).

12. The winding winding core according to one or more of claims 1 to 11, comprising a thermoplastic material without any or at most a very small content of filler or filler.

The winding wheel core according to one or more of claims 1 to 12, wherein the thickness of the limiting elements (13, 16) corresponds approximately to half the thickness (a) of the elements (11) of spring.

14. The winding wheel core according to claims 1 and 11, wherein the number of limiting elements (13, 16) is divisible by 3. 5

15. The winding wheel core according to claim 1 and one or further from claims 5 to 7, wherein each spring element (11) is assigned at least one limiting element , y-t, d3).

16. The winding impeller core according to claim 1 and one or both of claims 2 and 8, wherein at least three limiting elements designed as limit stops (16, 16A, 16B) are provided.

17. The winding winding core according to one or more of claims 1 to 16, / »- wherein the inner ring (10) is of partially hollow design and is provided with continuous reinforcement ribbons (19, 21), the number of which approximates the number 20 of spring elements (11) or is a multiple thereof.