Matsushita Electric Industrial Co., Ltd.

Ryota Shimizu

Takenori Akamine

Isao Kozu

Toshiharu Sasaki

Naoyuki Ohara

Kiichiro Yamada

Souji Ohba

Hideki Ohura

A step linear actuator includes a stationary member of a magnetic material, a pair of moving units each being in contact with the stationary member and having a magnetic coupling element for magnetically generating a contact force to the stationary member and an opposing face opposing to the opposing face of the other moving unit through a gap therebetween, and a magnetic driver for generating magnetic forces to control the contract force between each moving unit and the stationary member and to cause a relative movement of the pair of moving units with respect to each other.

Step linear actuator

A magnetic tape recording and/or reproducing apparatus has a motor driven differential mechanism having racks and pinions, an operatively activatable electromagnetic mechanism having movable levers and a plurality of magnetic coils for moving the levers for engagement with the differential mechanism and a tape transport system adapted to cooperate with the differential mechanism so as to be placed in a desired tape transport operation in accordance with the activational condition of the coils. The apparatus also has a pair of one-way clutches for transmitting the driving power of the motor selectively to the differential mechanism or to the tape transport system in accordance with the rotational direction of the motor.

Operation control device for tape recorders

A magnetic tape recording and/or reproducing apparatus has a cam driven mechanism for moving a pressure roller from a first position within a cutout recess of a tape cassette and behind the inner side of a magnetic tape to a second position slightly spaced from a tape drive capstan. According to said movement of the pressure roller, a tape drawing pin is moved from an inoperative position within the cutout recess and behind the inner side of the magnetic tape to an operative position where the tape is drawn out of the cassette and brought into a desired tape path so as to be engaged with a magnetic head which is stationarily mounted on a base plate of the apparatus. The pressure roller is further moved to a third position in which it is pressed against the tape drive capstan by a solenoid mechanism upon energization thereof so as to move the tape.

Magnetic tape recording and/or reproducing apparatus

A guide drum apparatus for a video tape recorder and/or player has: a main shaft secured on a chassis, a first guide drum rotatably mounted on the main shaft and having a plurality of magnetic video heads, driving means for rotating the first guide drum at a rotational speed greater than the speed of movement of a tape, and a second guide drum mounted on the main shaft coaxially with the first guide drum and rotatable independently therefrom. The first and second guide drums have tape guiding portions, respectively, which are opposed to each other and have peripheral tape guide surfaces to guide the magnetic tape. Adjusting means is mounted on the main shaft so as to adjust the height of the video heads with respect to the tape guiding portion of the second guide drum. With this guide drum apparatus, the height of the video heads can be adjusted precisely and easily to trace the video track on the tape even while the video heads are rotating at a high speed.

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Toyonaka, Japan

Ryota Shimizu