# US 4,393,426 A · Tape recorder head adjusting mechanism

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,393,426 A
- Document ID: US4393426A
- Status: Granted
- Kind: A
- Application number: 06/260,989
- Filed: 1981-05-06
- Granted: 1983-07-12
- Earliest claimed: 1980-05-16
- Assignees: Mitsubishi Denki Kabushiki Kaisha
- Inventors: Yasuyuki Nakanishi
- Web page: https://patentgrep.com/patent/US4393426A

## CPC

- G11B 5/54: with provision for moving the head into or out of its operative position or across tracks
- G11B 15/10: Manually-operated control; Solenoid-operated control {(G11B15/44 takes precedence)}
- G11B 15/1883: {for record carriers inside containers}
- 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 tape recorder head adjusting mechanism includes a small gear wheel rotatably driven; a large gear wheel interlocking with the small gear wheel; a cam fixed to and rotated with the large gear wheel; a movable pin in contact with the cam; a head base moved back and forth by the movable pin; and a head fixed to said head base.

## Claims

### Claim 1

A tape recorder head adjusting mechanism comprising:
a movable pin constrained for reciprocation along a path,
means for intersecting a recording tape with said path,
a head base including means for moving said head base with said pin,
a head fixed to said head base, whereby said head is movable towards and away from said recording tape along said path,
a cam rotatable about an axis transverse to said path,
means for biasing said pin into contact with a cam surface of said cam,
means for rotating said cam about said axis, whereby rotation of said cam causes said pin, said head base and said head to move along said path,
first and second movable plates reciprocatable in a first direction transverse to said path,
means for selectively moving said first plate into intersection with said path at a first position along said path, and
means for selectively moving said second plate into intersection with said path at a second position, spaced from said first position, along said path, whereby either said cam, said first plate or said second plate can selectively restrain said pin in one of three positions along said path, so that said head can be selectively restrained in three positions relative to said tape.

### Claim 2 (depends on 1)

A tape recorder according to claim 1 further comprising a solenoid for controlling the movement of said movable plate.

### Claim 3 (depends on 1)

A tape recorder according to claim 1 wherein said three head positions respectively comprise a play position, a heading position and an eject position.