JPH03113766A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To shorten the energizing time for a plunger and to suppress the rise of temp. and to diminish the loss of energy by momentarily energizing the plunger only when a power source for a driving motor is turned off. CONSTITUTION:When the driving motor 2 is turned off, the plunger 27 is momen tarily energized at the same time. A stopper level 8 is turned clockwise around a fulcrum 8a by the plunger 27 against spring force of a 1st spring 29, so as to release the stopper lever 8 and a stopper 12 from their detaining. As a result, a setting gear 10 is turned counterclokwise via a 2nd cam by bending force of a leaf spring 15, and a 1st cam 11 is also turned counterclockwise, so that a cam lever 16 is turned clockwise around a fulcrum 16a by spring force of a 2nd spring 17, and at the same time, a head fixing plate 3 is withdrawn, and a capstan shaft 18a and a transporting pinch roller unit 5 are separated from each other. By this method, the energizing time for the plunger is extreme ly shorted.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides that when the drive motor is on, the pinch roller unit comes into contact with the capstan shaft, and when the drive motor is off, the pinch roller unit comes into contact with the capstan shaft. This relates to a magnetic tape device that is separated.

[Conventional technology]

6 is a plan view showing an example of a conventional magnetic tape device, FIG. 7A is a plan view of the main part of FIG. 6, and FIG. 7B is a front view of FIG. 7A, where l is a chassis, and 2 is a chassis 1. 3 is a head fixing plate that is movable in the chassis 1 and has an L-shape as a whole, and 19 is a third spring that biases the head fixing plate 3 in the forward direction (direction of arrow A). ,
Numeral 4 is a magnetic head that is provided in the middle of the head fixing plate 3 and comes into contact with a magnetic tape (not shown). Numeral 5 is a first magnetic head that is provided at one end of the head fixing plate 3 and is used to forward the magnetic tape at a constant speed. A pinch roller unit 6 is provided at the other end of the head fixing plate 3, and is a second pinch roller unit for feeding the magnetic tape in reverse at a constant speed.

A plunger 7 is engaged with the base end of the stopper lever 8. A first spring 9 is disposed at a position opposite to the plunger 7 via the stopper lever 8.

10 is a setting gear rotatably provided on the chassis 1, 10a is a notch formed in a part of the outer circumference of the setting gear 10, and 11 is a setting gear 10.
A first cam formed on the central axis of the upper surface, 12 a stopper formed on the outer periphery of the upper surface of the setting gear 10, and 13 a second cam formed on the central axis of the lower surface of the setting gear 10. It is a cam.

14 is a drive gear that meshes with the setting gear 10 and transmits the rotational torque of the drive motor 2 through a gear group (not shown); 15 is a second cup 13 at the tip;
A leaf spring 16 presses a cam lever 18 whose tip abuts against the first cam 11 by the spring force of a second spring 17.
a, 18b are the first pinch roller unit 5 and the second pinch roller unit 5;
These are first and second capstan shafts provided near the pinch roller unit 6, respectively.

Next, the operation when the magnetic tape is caused to travel forward will be explained. When the power is turned on, the drive motor 2 is driven, the drive gear 14 is rotated, and the setting gear 10 is rotated counterclockwise. As the setting gear 10 rotates, the second cam 13 bends the tip of the leaf spring 15 clockwise, and the first cam 11 presses the base end of the cam lever 16.
It rotates counterclockwise about the fulcrum 16g against the spring force of the second spring 17. As a result, the head fixing plate 3 moves forward in the direction of arrow A due to the third spring force 19, and the first pinch roller unit 5 presses the capstan shaft 18 via the magnetic tape, causing the rotational force of the capstan shaft 18 to press against the capstan shaft 18. is transmitted to the magnetic tape, and the magnetic tape enters a play state in which it comes into contact with the magnetic head 4 and is fed. Also, at that time, the plunger 7 is energized at the same time as the drive motor 21\ is energized.
As a result, the stopper lever 8, which has been rotated counterclockwise about the fulcrum 8a against the spring force of the first spring 9, is engaged with the stopper 12, and the setting gear 10 is locked. In this state, the notch 10a of the setting gear 10 faces the drive gear 14, the drive gear 14 idles, and its rotational torque is not transmitted to the setting gear 10.

When the power supply to the drive motor 2 is set to QFF from the above state, the power supply to the plunger 27 is stopped at the same time.
The spring force of the first spring 9 moves the stopper lever 8 to the fulcrum 8.
The stopper lever 8 is rotated clockwise about the stopper 12, and the stopper lever 8 and the stopper 12 are unlocked. As a result, 5 leaf springs 1
5 rotates the setting gear 10 counterclockwise via the second cam 13, and the first cam 11 also rotates counterclockwise, so the spring force of the second spring 17 causes the cam lever to rotate. 16 rotates counterclockwise around the fulcrum 16a, and the head fixing plate 3 retreats in the direction of arrow B.
Capstan shaft 18a and first pinch roller unit 5
The period is w1, and the so-called "pinch roller unit off" state is reached.

[Problem to be solved by the invention]

In the conventional magnetic tape device configured as described above, in order to prevent deformation of the first pinch roller unit 5 and the second pinch roller unit 6, the pinch roller units 5, 6 and the cap are Although separated from the stand shafts 18a and 18b, the plunger 7 is energized in the play state, and the action of the plunger 7 causes the stopper lever 8 to lock the stopper 12 against the spring force of the first spring 9. However, during the play state, the plunger 7 is always energized and becomes a heat source, causing a temperature rise inside the set and energy loss (large load current).

The present invention has been made to solve these problems, and aims to provide a magnetic tape device that suppresses internal temperature rise and reduces energy loss.

[Means to solve the problem]

In the magnetic tape device according to the present invention, the plunger is instantly energized only when the power of the drive motor is turned off.
The lock between the stopper and the stopper lever is released, and the capstan shaft and the pinch roller unit are separated.

[Effect]

In this invention, when the drive motor is powered on, the setting gear is prevented from rotating by the stopper lever, and the capstan shaft and the pinch roller unit are in contact with each other, but during this time, no current is applied to the plunger.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, and the same or corresponding parts as in FIGS. 6, 78, and 7B are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, 29 is a first spring that is provided at the end of the stopper lever 8 and forces the stopper lever 8 by one hand in the direction in which the tip thereof is always locked with the stopper 12, and 27 is a first spring that is provided at the end of the stopper lever 8. It is a plunger that is engaged and momentarily energized only when the drive motor 2 is de-energized to release the lock between the stopper 12 and the stopper lever 8 against the spring force of the first spring 29.

FIG. 2 is an electric circuit diagram showing a state in which the plunger 27 is energized for an instant when the drive motor 2 is de-energized, and the time during which the plunger 27 is energized varies depending on the capacity of the capacitor 30. be done.

Next, the forward running operation of the magnetic tape device having the above configuration will be explained based on FIG. 3.

When the power is turned on, the drive motor 2 is driven, the drive gear 14 is rotated, and the setting gear 10 is rotated counterclockwise. As the setting gear 10 rotates, the second cam 13 bends the tip of the leaf spring 15 clockwise, and the first cam 11 presses the base end of the cam lever 16, causing the lever 16 to , rotates counterclockwise about the fulcrum 16a against the spring force of the second spring 17. As a result, the head fixing plate 3 moves forward in the direction of arrow C by the third spring force 19, and the first pinch roller unit 5 presses the capstan shaft 18 via the magnetic tape, causing the capstan shaft 18a to move forward. The rotational force is transmitted to the magnetic tape, and the magnetic tape enters a play state in which it comes into contact with the magnetic head 4 and is fed. At this time, the stopper lever 8, which is biased counterclockwise about the fulcrum 8a by the spring force of the first spring 29, is engaged with the stopper 12, and the setting gear 10 is locked.

In this state, the notch 10a of the setting gear 10 faces the drive gear 14, the drive gear 14 idles, and its rotational torque is not transmitted to the setting gear 10.

When the drive motor 21\ is de-energized from the above state, the plunger 27 is energized at the same time, and the first plunger 27 moves against the spring force of the first spring 29 to the stopper lever 8. is rotated clockwise about the fulcrum 8a to release the engagement between the five-seat lever 8 and the stopper 12. As a result, the bending force of the leaf spring 15 causes the setting gear 1 to move through the second cam 13.
0 rotates counterclockwise and the first cam 11 also rotates counterclockwise, so the spring force of the second spring 17 causes the cam lever 16 to rotate counterclockwise around the fulcrum 16a and fix the head. The plate 3 retreats in the direction indicated by the arrow, and the capstan shaft 18a and the feeding pinch roller unit 5 are separated from each other, resulting in a so-called "pinch roller unit off" state.

Since the power supply to the 1st runger 7 is stopped instantaneously (for about 20 On+s), the pinch roller unit off 1st descendant
It is rotated counterclockwise around the fulcrum 8a by the spring force of the spring 29 (see FIG. 5).

Incidentally, when the magnetic tape device of the above embodiment is mounted on an automobile, the plunger 27 may be operated by controlling the current from the battery by a microcomputer.

〔Effect of the invention〕

As explained above, according to the magnetic tape device of the present invention, when the power of the drive motor is on, the stopper lever is engaged with the stopper by the spring force of the spring, and the rotation of the setting gear is prevented, and the cap The stun shaft and the pinch roller unit come into contact, but the plunger is not energized during that time.The plunger is energized momentarily only when the drive motor is turned off, and the stopper is locked with the stopper lever. is released, and the capstan shaft and pinch roller unit are separated from each other, so the plunger is energized while the drive motor is energized and the pinch roller unit is in contact with the capstan shaft. In comparison, the energization time of the plunger l\ is extremely shortened, resulting in the effect that internal temperature rise and loss of electrical energy can be significantly suppressed.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being an enlarged plan view of the main parts, Figure 2 being an electric circuit diagram,
Fig. 3 is a plan view in the playing state, Fig. 4 is a plan view when the pinch roller unit is off, Fig. 5 is a plan view after the pinch roller unit is off, and Fig. 6 is an example of a conventional magnetic tape device. The plan view, Figure 78, is the main part plan view of Figure 6, and Figure 7.
Figure B is a front view of Figure 78. In the figure, 1 is a chassis, 2 is a drive motor, 3 is a head fixing plate, 4 is a magnetic head, 5 is a first pinch roller unit, 6 is a second pinch roller unit, 8 is a stopper lever, and 10 is a setting 12 is a stopper, 16 is a lever, 18 is a capstan shaft, 27 is a plunger, and 29 is a first spring. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] a head fixing plate that is movably provided with respect to the chassis and has a magnetic head and a pinch roller unit attached thereto; a setting gear that is rotatably provided on the chassis and that transmits the rotational torque of a drive motor; a cam lever that abuts the fixing plate and has its other end abutted against the setting gear to move the head fixing plate in conjunction with the rotation of the setting gear; A stopper lever that locks onto the gear and prevents rotation of the setting gear, and a spring and a plunger that are respectively provided at the base end of the stopper lever and enable the stopper lever to engage and disengage from the setting gear. , in a magnetic tape device in which the pinch roller unit is in contact with the capstan shaft while rotation of the setting gear is prevented by the stopper lever, the plunger is moved only when the power to the drive motor is turned off; The magnetic tape device is characterized in that the stopper and the stopper lever are disengaged from each other, and the capstan shaft and the pinch roller unit are separated from each other.