# US 4,399,960 A · Magnetic tape cassette

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- Number: US 4,399,960 A
- Document ID: US4399960A
- Status: Granted
- Kind: A
- Application number: 06/224,950
- Filed: 1981-01-14
- Granted: 1983-08-23
- Earliest claimed: 1980-01-14
- Assignees: TDK Electronics Co., Ltd.
- Inventors: Shigemasa Shoji
- Web page: https://patentgrep.com/patent/US4399960A

## CPC

- G11B 23/08757: {Guiding means}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A reel to reel magnetic tape cassette having a tape guide adjacent the supply reel comprising a rotatable element and a guide adjacent the take up reel which is a non-rotatable element whereby frictional resistance of the tape is reduced at the unreeling side and loosening or slack of the tape during transport is minimized.

## Claims

### Claim 1

In a magnetic tape cassette having a pair of reels therein for holding a magnetic tape which travels from one reel from which it is unreeled along a front edge of said cassette to the other reel upon which it is reeled during recording and reproducing, the improvement for guiding said tape along said front edge of said cassette comprising a rotatable tape guide positioned adjacent to both said front edge of said cassette and said one reel from which said tape is unreeled, and a nonrotatable tape guide positioned adjacent to both said front edge of said cassette and said other reel upon which said tape is reeled.

### Claim 2 (depends on 1)

A magnetic tape cassette according to claim 1, in which said cassette includes a tape pad and guide post assembly receiving a magnetic tape from said reel from which the tape is unreeled during recording and reproducing, the tape passing from said assembly thence to said rotatable tape guide and thence to said other nonrotatable tape guide and thence to said reel upon which said tape is reeled.

### Claim 3 (depends on 1, 2)

A magnetic tape cassette according to claim 1 or 2, in which said cassette is of the type in which the magnetic tape moves at a constant travelling speed during recording and reproducing only in one direction.