Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
Reexamination Certificate
1997-05-07
2001-01-30
Korzuch, William R. (Department: 2754)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Tape record
Reexamination Certificate
active
06181508
ABSTRACT:
TECHNICAL FIELD
The present invention is related to a tape drive unit which is suitably used, for instance, in a portable compact cassette player.
BACKGROUND ART
At present, cassette players usually have respective operational functions: normal running (will hereinafter be described as FWD), reverse running (will hereinafter be described as REV), fast running (will hereinafter be described as FF), and rewind (hereinafter described as REW) of a tape.
In tape drive units which have been employed in such kinds of cassette players, there was proposed one which is provided with a cam gear having a cam face formed on its principal plane side, thereby for selectively switching the operation modes such as FWD, REV, FF, REW modes and so on.
In such tape drive unit, when the above-mentioned cam gear is rotated, a mode switching mechanism for switching to each operation mode is operated by means of the above-mentioned cam face. The rotational angle position of the cam gear and said each operation mode are made to correspond to each other. That is, by rotating the cam gear by a motor or the like and stopping it at a predetermined rotational angle for positioning, a predetermined operation mode is selected.
For instance, in the tape drive unit having a mode switching mechanism of a reverse-type recording/reproducing device, which is proposed in Japanese laid-open patent publication No. 62-163353 by the applicant of this case, the driving force of a single drive motor rotates and operates a pair of capstans for allowing a tape to travel to the FWD and REV sides, a reel shaft on which a tape reel is mounted for taking up the tape that was made to travel, and a cam gear for selectively switching a plurality of operation modes, respectively. That is, the driving force of the drive motor is transmitted to the capstans, reel shaft, etc. through a driving force transmission mechanism comprising a driving belt, gear and the like.
The cam gear has a gear portion having a plurality of tooth lacking portions formed on the outer periphery thereof, and has a predetermined cam face and a portion to be engaged which is protrusively provided on the major surface thereof. The cam gear is positioned through engagement of the portion to be engaged by a cam gear engaging member at a rotational angle position, at which the drive gear which transmits the driving force of the drive motor corresponds to the tooth lacking portions. The cam gear engaging member is constructed to be reciprocated by a plunger and an activating spring.
When the cam gear rotates, a mode switching mechanism for switching the operation mode is operated by the cam face. The mode switching mechanism is formed such that a predetermined operation mode can be selected by switching the transmission path of the driving force through an operation of moving the shaft of a gear for transmitting the driving force of the drive motor and by switching the travel direction of the tape through selectively pressing a pinch roller against the pair of capstans or the like.
That is, in the tape drive unit, to switch the operation mode, the plunger is actuated to release the engagement with the cam gear and engage the drive gear with the gear portion, thereby rotating the cam gear. Whereupon, the mode switching mechanism is operated and the tape traveling direction and the like are switched. The mode switching mechanism is operated according to the rotational angle position of the cam gear for switching to a predetermined mode corresponding to the rotational angle position. Accordingly, when the operation mode has been changed to a desired one, the desired operation mode is selected by releasing the actuation of the plunger and engaging and positioning the cam gear by the cam gear engaging member.
However, since the plunger has been required in the prior art as described above, there is a disadvantage that the cost will increase accordingly, and timing is important for the plunger trigger operation, in which a malfunction tends to occur, and the plunger itself is a part which easily malfunctions by the influence of dust and the like. In addition, a microcomputer is needed because of complicated control, which also leads to an increase in the cost, and malfunction also tends to occur due to bugs in the microcomputer. Moreover, there are various problems such as the need for care for resetting after battery replacement because of the electrical mode control, the difficulty of understanding the operation and the difficulty of service due to microcomputer control, and the like.
This invention was accomplished in view of such points, and the object of which is to provide a tape drive unit that requires no plunger and microcomputer thereby solving the above problems.
DISCLOSURE OF THE INVENTION
A first present invention comprises a motor which is forwardly and reversely rotatable, a pair of reel shafts for driving a tape reel having a magnetic tape wound thereon, mode setting means driven by the reverse rotation of the motor for forming the respective modes which set the tape traveling direction and tape traveling speed, and driving means driven by the forward rotation of the motor for driving the reel shafts according to the mode formed by the mode setting means, wherein after setting a mode by the reverse rotation of the motor, the reel shafts are driven by the forward rotation of the motor according to the mode that was set above.
In a second present invention, the setting means in the tape drive unit of the first present invention comprises a mode cam member driven by the reverse rotation of the motor, a first switch mechanism moved by the mode cam member for switching the tape traveling direction, and a second switch mechanism moved by the mode cam member for switching the tape traveling speed.
In a third present invention, the setting means in the second present invention comprises detecting means for detecting the positional state of the mode cam member.
In a fourth present invention, the driving means in the tape drive unit of the first present invention comprises a first transmission mechanism for transmitting the rotational driving force of the motor to either of the pair of reel shafts, and a second transmission mechanism for transmission to the other reel shaft, wherein the rotational driving force of the motor is selectively transmitted to the pair of reel shafts pursuant to the mode set by the mode setting means.
A fifth present invention comprises a motor which is forwardly and reversely rotatable, a pair of reel shafts for driving a magnetic tape, a magnetic head which is provided movably between a first position at which it can record on and/or reproduce from the magnetic tape and a second position at which it does not abut on the magnetic tape, a pair of capstans, a pair of pinch rollers corresponding to the pair of capstans, respectively, mode setting means driven by the reverse rotation of the motor for forming the respective modes for setting the tape traveling direction and the tape traveling speed, moving means driven by the forward rotation of the motor for moving the magnetic head according to the mode formed by the mode setting means to the first position at which the magnetic head can record on and/or reproduce from the magnetic tape, switch means driven by the forward rotation of the motor for selectively moving the pair of pinch rollers to cause them to abut on the capstans according to the mode formed by the mode setting means, and driving means driven by the forward rotation of the motor for driving the reel shafts according to the mode formed by the mode setting means, wherein after the mode is set by the reverse rotation of the motor, movement of the magnetic head, switching of the pinch rollers, and driving of the reel shafts are carried out by the forward rotation of the motor according to the set mode.
In a sixth present invention, the setting means in the tape drive unit of the fifth present invention comprises a mode cam meter driven by the reverse rotation of the motor, a first switch mechanism moved by the mode cam member f
Korzuch William R.
Sony Corporation
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