US 6,742,641 B2Granted

Rotational driving apparatus of magnetic tape device and magnetic tape device

AssigneeFunai Electric Co., Ltd.

InventorDaisuke Takasaka

Life of this patent

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Abstract

A rotational driving apparatus of a magnetic device, a clutch mechanism or a speed change clutch mechanism is provided selectively in a path for transmitting a rotation from a capstan motor to a feed reel or a take-up reel. The clutch mechanism decelerates the rotation of the motor at a first reduction ratio, and transmits the resultant rotation to a change-over gear. The speed change clutch mechanism has a first transmission shaft, a pulley gear, a constant torque transmission member, a speed change output gear, speed change intermediate gear and a speed change movable gear. The speed change intermediate gear and speed change movable gear are mounted on a second transmission shaft provided close to a first transmission shaft, and transmit the rotation of the pulley gear to the speed change output gear via a constant torque transmission member, or directly with the speed of the rotation changed.

A rotational driving apparatus of a magnetic tape device comprising:

a clutch mechanism;
a rotation transmission path change-over gear;
a feed reel;
and
a take-up reel,
wherein a rotation of a motor is transmitted to the clutch mechanism and a rotation of the clutch mechanism is selectively transmitted to the feed reel or the take-up reel via the rotation transmission path change-over gear,
the clutch mechanism can be selectively provided with a first clutch mechanism adapted to decelerate the rotation of the motor at a first reduction ratio and transmit the resultant rotation to the change-over gear, and a second clutch mechanism adapted to decelerate the rotation of the motor at a second reduction ratio and transmit the resultant rotation to the change-over gear,
the first clutch mechanism comprises:
a first shaft;
a first pulley supported rotatably on the first shaft and adapted to receive the rotation of the motor;
a first clutch output gear supported rotatably on the first shaft and meshed with the change-over gear;
a first constant torque transmission member provided between the first pulley and first clutch output gear and adapted to transmit torque of the first pulley lower than a predetermined level to the first clutch output gear;
and
a clutch member adapted to transmit a rotation of the first pulley to the first clutch output gear directly or via the first constant torque transmission member, and
the second clutch mechanism comprises:
a second shaft;
a second pulley supported rotatably on the second shaft;
a second clutch output gear supported rotatably on the second shaft and meshed with the change-over gear;
a second constant torque transmission member provided between the second pulley and second clutch output gear and adapted to transmit torque of the second pulley lower than a predetermined level to the second clutch output gear;
and
a speed change clutch member provided close to the second shaft and adapted to transmit a rotation of the second pulley to the second clutch output gear directly or via the second constant torque transmission member with a speed of the rotation changed.

18 more elements

Facts

Application

10/351,858Filed 27 Jan 2003

Priority

JP 2002-000337 U29 Jan 2002

Published

US 2003/0141162 A131 Jul 2003

Granted

1 Jun 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

G11B 15/32
Driving record carriers by members acting directly or indirectly thereon: through the reels or cores on to which the record carrier is wound
F16D 11/10
Actuated by moving a non-rotating part axially: with clutching members movable only axially
G11B 15/44
Driving; Starting; Stopping; Arrangements for control or regulation thereof: speed-changing arrangements; Reversing arrangements; Drive transfer…
G11B 15/50
Controlling, regulating, or indicating speed: by mechanical linkage, e.g. clutch

Abstract

Claims7