Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1997-01-06
1999-02-23
Jillions, John M.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
2426135, 2426112, B65H 7510, B65H 7518
Patent
active
058735437
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Winding hub for information carriers in strip or tape form, the width of the outer winding surface of the winding hub corresponding at least to the width of the information carrier, the winding hub comprising an outer ring and an inner ring, which are radially interconnected by elastically deformable spring elements running radially and 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 hub having an inner and outer circumference with an inner and outer diameter, respectively, the winding hub having a compression ratio of the compressed inner diameter to the compressed outer diameter of less than 1:4 during winding up of the information carrier.
DE-U 9400220 discloses the winding hub described above with spring elements which lend the same a certain elasticity in the radial direction.
Such a winding hub is used for winding up magnetic tapes after cutting and the wound winding hub is supplied to cassette loading companies or cassette recording companies. These companies mount the winding hubs onto reeling machines, which engage in the individual winding hub by means of a take-up mechanism and clamp said hub from the inner circumference.
These take-up mechanisms have a limited clamping displacement. The inner ring of the winding hub is resiliently expanded by the mechanism and offers little resistance to this resilient expansion. As a result, the winding hub is not held with the necessary firmness on the mechanism and accidents can occur due to detaching and flying off of the tape roll and/or of the hub.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a winding hub of the type mentioned at the beginning which has adequately secure mounting.
We have found that this object is achieved by a winding hub for information carriers in strip or tape form, the width of the outer winding surface of the winding hub corresponding at least to the width of the information carrier, the winding hub comprising an outer ring and an inner ring which are radially interconnected by elastically deformable spring elements running radially and 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 hub having an inner and outer circumference with an inner and outer diameter, respectively, the winding hub having a compression ratio of the compressed inner diameter to the compressed outer diameter of less than 1:4 during the winding up of the information carrier, which winding hub comprises limiter elements which are arranged in a centrally symmetrical manner and act substantially 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 is shortened, by means of the limiter elements, which results in an increase in the transfer of force between inner ring and outer ring. The spring rigidity is increased and the "spring" becomes harder.
In a second practical configuration, in the event of a defined enlargement of the diameter (expansion) of the inner ring, a supporting of the inner ring on the outer ring is established by means of the limiter elements.
Both solutions provide the same result, namely a limitation of any enlargement of the diameter of the inner ring.
This achieves the effect that, by in each case a relatively simple modification, the operational reliability of the winding hubs is increased considerably.
In an advantageous design, the spring elements comprise substantially S-shaped webs with a circumferential part and radial parts at the ends.
The circumferential part of the S-shaped webs may expediently be arranged in the angular range of about 85.degree. to about 95.degree. relative to a radius of the winding hub.
In an adva
REFERENCES:
patent: 3632053 (1972-01-01), Edwards et al.
patent: 3836090 (1974-09-01), Mix
patent: 4176804 (1979-12-01), Nemoto et al.
patent: 4923137 (1990-05-01), Jorgensen et al.
patent: 5257749 (1993-11-01), Liepold et al.
patent: 5520353 (1996-05-01), Brandstetter et al.
Liepold August
Lutz Gottfried
Schneider Alfred
Scholtysik Bernd
Thiele Hartmut
EMTEC Magnetics GmbH
Jillions John M.
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