Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Patent
1984-03-14
1987-10-20
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
74209, 242201, 360 93, G11B 5008
Patent
active
047018160
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a capstan friction drive apparatus of a tape recorder which has a capstan and a friction wheel which is brought into slidable contact with a flywheel on which the capstan is mounted, the friction wheel serving to transmit a rotational force to the flywheel.
BACKGROUND ART
In general, in a friction drive apparatus such as a disk drive system, a material such as rubber which has a considerably large friction coefficient is used to cover at least one of two opposing contact surfaces, so that a sufficient contact pressure acts between these two surfaces, thereby transmitting the rotational force through a sufficient friction force. However, when a friction drive apparatus is not used for a long period of time, a rubber surface which has been in tight contact with the opposing contact surface becomes locally recessed, since the rubber surface deforms over time. When the friction drive apparatus is rotated again under this condition, the local recess results in mechanical vibration. In particular, in electronic equipnent such as a cassette tape recorder which is greatly affected by mechanical vibration, the deformation over time described above has the effect of degrading wow and flutter characteristic. In addition, the deformation causes noise and vibration.
On the other hand, when a friction wheel which is biased to apply a predetermined contact pressure is directly coupled to a motor shaft, the biasing force is affected by the self-weight of the motor. The contact pressure between the friction wheel and the flywheel varies in accordance with an orientation of the tape recorder. In this manner, the self-weight of the motor affects and degrades precision and reliability.
OBJECT OF INVENTION
The present invention has been made to overcome the conventional problems described above, and has as its object the provision of a capstan friction drive apparatus of a tape recorder, wherein a friction surface is not subjected to deformation over time (e.g., recess) even if the apparatus will not be used for a long period of time, by decreasing an initial contact pressure and at the same time a sufficient frictional force is provided during rotation, thereby transmitting the predetermined rotational force.
It is another object of the present invention to provide a capstan friction drive apparatus of a tape recorder, wherein a contact pressure between the friction wheel and the flywheel will not vary by a self-weight of a motor when the friction wheel is directly coupled to the motor shaft.
SUMMARY OF INVENTION
In order to achieve the above objects of the present invention, there is provided a friction drive apparatus of a tape recorder which has a capstan and a friction wheel which is brought into slidable contact with a flywheel on which the capstan is mounted, the friction wheel serving to transmit a rotational force to the flywheel, wherein there are provided a support mechanism for pivotally supporting said friction wheel about a pivotal point which is eccentric with respect to a rotating shaft of said friction wheel, and biasing means for pivotally biasing said friction wheel about said pivotal point in a contact surface direction of said flywheel, said biasing means being arranged to apply a predetermined initial contact pressure between said friction wheel and said flywheel, and a rotational direction of said friction wheel being determined such that a reaction force at said contact surface upon rotation of said friction wheel acts in a direction to cause pivotal movement of said friction wheel in the same direction as a direction toward which said biasing means acts, thereby increasing a contact pressure between said friction wheel and said flywheel above the initial contact pressure.
Said support mechanism pivotally supports a motor through a pair of support members which are respectively disposed in front of and behind said motor, so that said friction wheel mounted on said rotating shaft of said motor is supported, said pair of support members being disp
REFERENCES:
patent: 3810242 (1974-05-01), Ikeda
patent: 3932892 (1976-01-01), Saito
patent: 4438879 (1984-03-01), Rudi
Eslinger Lewis H.
Severin David J.
Sony Corporation
Wolff John H.
LandOfFree
Capstan friction drive apparatus of tape recorder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Capstan friction drive apparatus of tape recorder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capstan friction drive apparatus of tape recorder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1615731