Plastic tape guide for videocassette

Advancing material of indeterminate length – Passive guide

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Details

242199, 242 76, B65H 2304, B65H 2700

Patent

active

050744518

ABSTRACT:
A tape guide having improved durability and excellent tape tracking characteristics. In one aspect, the present invention concerns a tape guide that comprises a durable, polymeric, resiliently expandable, substantially cylindrical sleeve. An outer tape guiding surface on said sleeve is concave for biasing a magnetic recording tape toward a centered position on the outer tape guiding surface. An inner surface on the sleeve defines a central bore that is smaller in size than the tape guide post. The central bore, though, is of a sufficient size such that the tape guide can be resiliently expanded to fit over a tape guide post with a resilient, gripping effect. A thickened wall portion is circumferentially positioned on the inner surface in a centered position between the top end and the bottom end of the sleeve. In a preferred embodiment, the sleeve has two opposing slot edges that define a slot along the axial direction of the sleeve. The slot edges are biased towards each other. The preferred tape guide also comprises a center gate that is located on the sleeve in a centered position between the top end and the bottom end of the sleeve.

REFERENCES:
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patent: 3910692 (1975-10-01), Scibilia
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patent: 4429823 (1984-02-01), Umehara
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patent: 4745508 (1988-05-01), Tollefson
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patent: 4999356 (1990-04-01), Nakagawa
Hoechst Celanese Preliminary Data Sheet for Celcon EF-25 (1988).
Ambur et al., Machine Design, pp. 91-95 (Apr. 20, 1989).
Bernhardt, Processing of Thermoplastic Materials, p. 348 (1959).
Cloud et al., Plastics Technology, vol. 24, No. 12, pp. H2-1 to H2-7 (Nov. 1978) (Corresponding to pp. 107-113).

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