Composite tape guide of cassette tape for VTR
AssigneeSanwa Needle Bearing Co., Ltd.
InventorMasamitsu Tanaka
Life of this patent
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Abstract
A composite tape guide for a cassette tape for a video tape recorder includes a cylindrical tape guide body formed of inexpensive material such as plastic. More than half of the circumferential surface of the tape guide body which contacts a video tape is covered with a sheet member of nonmagnetic material. This material has improved wear resistance and anti-corrosive properties, and exhibits less frictional resistance against the tape than the remainder of the guide body surface. Thus, the guide exterior surface forms a composite of layer of two different materials.
Claims6
A composite tape guide for a video cassette tape, said tape guide comprising a generally cylindrical tape guide body, said tape guide body having a circumferential exterior surface with a first portion of a predetermined diameter and a second portion of a diameter smaller than said predetermined diameter, said second portion extending over more than half of the circumference of said tape guide body, said second portion being covered with a non-magnetic sheet which is substantially wear-resistant and anti-corrosive, said non-magnetic sheet exhibiting a frictional resistance against said video cassette tape which is less than the frictional resistance exerted by said first portion of said tape guide body against said tape, said tape guide body being stepped at a junction between said first and second circumferential portions, said tape guide body having four slits of a predetermined length at different locations of said body, said sheet member being substantially arcuate and including a plurality of bent rims of which are adapted to engage said slits, said sheet having a curvature which is smaller than the curvature of said tape guide body, said sheet comprising elastic material.
A composite tape guide for a video cassette tape, said tape guide comprising a generally cylindrical tape guide body, said tape guide body having a circumferential exterior surface with a first portion of a predetermined diameter and a second portion of a diameter smaller than said predetermined diameter, said second portion extending over more than half of the circumference of said tape guide body, said second portion being covered with a non-magnetic sheet which is substantially wear-resistant and non-corrosive, said non-magnetic sheet exhibiting a frictional resistance against said video cassette tape which is less than the frictional resistance exerted by said first portion of said tape guide body against said tape, said tape guide body being stepped at a junction between said first and second circumferential portions, said tape guide body having four slits of a predetermined length at different locations of said body, said sheet member being substantially arcuate and including a plurality of bent rims of which are adapted to engage said slits, said sheet having a curvature which is smaller than the curvature of said tape guide body, said sheet comprising elastic material, said sheet member comprising brass material which is plated with a non-magnetic hard metal.
Dependencies are inferred from the claim text.