JPH0424777B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a so-called front loading type magnetic recording and reproducing apparatus in which a tape cassette containing a magnetic tape is automatically loaded into the apparatus.

(b) Prior Art In a magnetic recording/reproducing device such as a video tape recorder (VTR), when a tape cassette is slightly inserted into the tape cassette insertion slot provided on the front of the device, the cassette is automatically pulled in and placed in a predetermined position within the device. There is a front loading method that can be attached to. This front-loading method typically
A dedicated motor is used as the drive source for the front loading mechanism.

However, from a cost perspective, it is disadvantageous to use a dedicated motor, and it is desirable to use it in common with other drive means.

From this point of view, in Japanese Patent Application Laid-open No. 60-246052 (G11B15/675), the front loading mechanism is driven by a capstan motor. The capstan motor and the front loading mechanism are connected and disconnected by a lever that rotates in conjunction with the loading operation, but the specific structure is not disclosed.

(C) Problems to be Solved by the Invention The present invention proposes a new configuration in which the capstan motor is used not only as the drive source for the front loading mechanism but also as the drive source for the reel stand drive device. It is.

(d) Means for Solving the Problems The present invention provides a magnetic recording and reproducing device in which a common motor serves as a drive source for a capstan for driving a tape at a constant speed, a reel stand drive device, and a front loading mechanism. A first gear provided on a capstan motor, a rotatably supported rotary lever, a second gear provided at one end of the rotary lever and meshing with the first gear, and a second gear provided at one end of the rotary lever. a means for transmitting the rotation of the two gears to the front loading mechanism; a cam gear having a cam portion that is linked to the rotation of the motor that controls the mode of the mechanism; and a cam gear that engages with the cam portion and moves in parallel; A slide lever that comes into contact with the other end of the rotating lever, and means for transmitting rotation of the capstan motor to an idler of a reel stand driving device, and a position regulating means for the idler is provided on a part of the slide lever. This is a magnetic recording and reproducing device characterized by the following.

(E) Effect: In other words, the position regulating means provided on the slide lever eliminates the possibility that the reel stand will be driven by the reel stand drive device when the front loading mechanism is driven by the capstan motor. loading tape cassette,
There is no possibility that ejection will be hindered.

(f) Examples Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 are plan views showing the main parts of the embodiment,
Figure 6 is a plan view showing the mechanism on the front side of the VTR.
FIG. 7 is a side view of the front loading mechanism.

In the figure, 1 is a mechanism chassis, 2 is a guide cylinder with a rotating head, 3 is a loading motor, 4 is a capstan of a direct drive capstan motor 30, 5 is a flywheel of the capstan motor, and 6 is a supply reel. stand, 7
is the take-up reel stand, 8 is the back tension lever,
60 is a band brake, 9 is a main brake lever for the supply reel stand, 10 is a main brake lever for the take-up reel stand, 11 is a central through hole provided in the mechanism chassis 1, 12 is an idler mechanism for driving the reel stand, 13 is a slip mechanism.

A first gear 14 is formed on the back side of the flywheel 5 of the capstan motor. 15 is a drive pulley (positionally fixed) of the front loading mechanism; 16 is a second gear having a booley portion 16a that is interlocked with this drive pulley 15 by a first belt 17; and 18 is a mechanism chassis. 1 a first rotary lever rotatably supported on the back side around a shaft 19 and supporting a second gear 16 at one end 18a; 20 a loading motor 3;
A drive mechanism (consisting of belts, pulleys, worms, gears, etc.) that transmits the rotation of The first slide lever is equipped with a pin 22a that
It controls the rotation of the rotation lever 18 and also controls the movement of a pinch roller lever (not shown).
27 is a pulley of the idler mechanism 12;
It is connected by a belt 28 to a capstan motor pulley 29 provided on the capstan motor. Therefore, the capstan motor 30 is used as a drive source for the idler mechanism 12.

The first rotation lever 18 is positioned in a counterclockwise direction in FIG. Location is restricted.

Although the tape drawing means is omitted in the figure, the loading means is composed of a sector gear or the like that moves by engaging with another cam groove (not shown) provided in the first cam gear 21. As a result, the tape is pulled out and wound around the guide cylinder 2 at a predetermined angle.

In the case of the embodiment of the present invention, the capstan motor 3
Since the driving force of 0 is used as the driving source for the front loading mechanism, each mode of the VTR to which it is shifted by the rotation of the loading motor 30 is set in the following order.

(Front loading mode (Figure 2)) ~
(Fast forward, rewind (FF) mode) ~ (Stop mode (Fig. 1)) ~ (Playback (record) mode)) ~ (Review mode) In other words, the FF mode and playback mode are placed on both sides of the stop mode. , Front loading mode is provided before FF mode. And, as described below, even with one loading motor,
This arrangement is the most rational for controlling the state of the VTR mechanism. In other words, if a front loading mode is provided next to the stop mode,
It takes time to shift from stop mode to playback or FF mode, and mode change speed is lost.
Furthermore, the front loading mode, in which the driving force of the capstan motor should be transmitted to the front loading mechanism, is in the regeneration or
This is because if it exists between the FF mode and the stop mode, the driving force must be continued and released, making the mechanism complicated.

These modes are determined by, for example, detecting the rotation angle of the first cam gear 21 with a rotary encoder (not shown), and a predetermined mode is determined by controlling forward/reverse rotation and stop of the loading motor. is set to Since each mode is arranged in this way, the time required to move from the stop mode can be shortened, which is advantageous in changing the mode.

In addition, in a configuration in which the driving force of the capstan motor is used to drive the rotation of the reel stand, there is a means for substantially prohibiting the rotation of the reel stand in some way in the front loading state. must be formed. Otherwise, cassette loading and ejecting operations may be hindered. Therefore, in this embodiment, in the front loading state, the position regulating means 80 for preventing the idler 12a (which can rotate about the shaft 12c) that drives the reel stand from coming into contact with the reel stands 6 and 7 is moved to the first slide. It is provided on the lever 22.

This position regulating means 80 is the first slide lever 2
This is a substantially triangular protrusion that protrudes toward the idler mechanism 12 from approximately the center of 2. At the tip of this protrusion, a first regulating surface 80a that prevents contact between the idler 12a and the supply reel stand 6 and the idler 12a are provided.
A is provided with a second restricting surface 80b that prevents contact between the take-up reel stand 7 and the take-up reel stand 7. Then, the first regulating surface 80a
and the second regulating surface 80b are substantially perpendicular to each other.

In FIG. 7, reference numeral 35 is a worm gear that is interlocked with the drive pulley 15 (through the shaft 61), and the rotation of the worm gear 35 moves the cassette holder of the front loading mechanism 36, thereby loading and unloading the cassette. executed. Since the front loading mechanism 36 has a general configuration, a detailed explanation will be omitted. Note that this front loading mechanism 36 is fixed at a predetermined position on the mechanism chassis.

The first rotating lever 18 is supported approximately at the center by a support shaft 19. Then, the first protrusion 18
A shaft 18b is installed on the shaft 18b, and the second gear 16 is rotatably supported around this shaft. Second protrusion 18
c comes into contact with the bent portion 1a of the mechanism chassis 1.

A torsion spring 37 is fitted to the support shaft 19, and the straight part (end) of this torsion spring 37
37a and 37b are engagement claws 1 of the first rotating lever 18.
8d, 18e, and 18f.

18g is a notch in the first rotation lever, and the straight portion 37b of the torsion spring 37 is located in this notch 18g.

The first slide lever 22 is guided by the shaft 38 and the like of the first cam gear 21 (the guide groove 22c fits therein). A cut and raised piece 22b is provided at the left end of the first slide lever 22 in FIG. It is designed so that it comes into contact with the notch at the 18g portion.

Further, the first rotating lever 18 is biased counterclockwise by the tension of the tension spring 70. Therefore, when the VTR mechanism is stopped as shown in Figure 1,
The first rotating lever 18 rotates to a position where the cut and raised piece 22b and the torsion spring 37 abut, and the first gear 14 and the second gear 16 do not mesh with each other.

From this state shown in FIG. 1 (stopped state), rotation of the loading motor 3 causes the fifth gear (drive mechanism 2
0 part) 39 rotates counterclockwise, and the first cam gear 21 rotates clockwise, thereby transitioning to the FF state. The cam groove 21a in the first cam gear 21 is formed on the back side of the first cam gear 21.

In the FF state, the distance of the cam groove 21a from the shaft 38 at the position where the pin 22a fits is the same as in the stopped state (FIG. 1), so the first slide lever 22
Movement to the left in the figure is not performed.

From the FF state, the loading motor 3 further rotates, the fifth gear 39 rotates counterclockwise, and the first cam gear 21 rotates clockwise, so that the first slide lever 22 gradually moves to the left in the figure. move in the direction.

Along with this horizontal movement, the first slide lever 2
The second cut and raised piece 22b pushes the torsion spring 37, and the first rotating lever 18 rotates clockwise in the figure. This rotation is regulated by the contact between the stopper pin 34 and the first rotation lever 18, and in this state, the first gear 14 and the second gear 16 mesh properly. After that, the first slide lever 22 further moves to the left in the figure, but this is due to the torsion spring 3.
7, and this torsion spring 37
Due to this action, the meshing between the first gear 14 and the second gear 16 becomes stable.

As mentioned above, the first rotating lever 18
It is biased counterclockwise in the figure by a tension spring 70 stretched between the rotary lever 18 and the rotary lever 18.
It is also possible to perform this biasing using the first belt 17.

Due to this urging force, the first cam gear 21 rotates counterclockwise from the front loading state (Fig. 2), contrary to the explanation so far.
When the mechanism changes from the FF state to the stopped state, the tension of the first belt 17 causes the first rotation lever 18 to rotate counterclockwise, and the meshing between the first gear 14 and the second gear 16 is released. and bending part 1
This rotation is restricted by the contact between a and the second protrusion 18c.

Next, the position regulation of the idler 12a will be explained.

Stop mode shown in Figure 1 (FF mode is the same)
In a mode (playback, etc.) in which the first slide lever 21 is moved to the right from the position of the first slide lever 21 in FIG.
0 does not come into contact with the idler 12a. Therefore, the idler 12a can drive the reel stands by coming into contact with the take-up reel stand 7 and the supply reel stand 6 depending on the rotational direction of the capstan motor 30 (see FIG. 3).

When an eject operation is performed to take out the tape cassette from this stop mode, the following operations occur. In other words, capstan motor 3
0 rotates clockwise for a certain period of time, and the idler 12a
comes into contact with the supply reel stand 6. After the capstan motor 30 stops rotating, the loading motor 3 starts rotating and the first slide lever 21
moves to the left in the figure. This movement causes the first
The regulating surface 80a also moves to the left in the figure, and the idler 12
By coming into contact with the rotating shaft 12b of the idler 12a, the idler 12a is rotated slightly counterclockwise, and the contact with the supply reel stand 6 is released (see FIG. 4).

When the first slide lever 22 finishes moving to the left in order to eject the tape cassette installed in the VTR, the capstan motor 30 starts rotating counterclockwise, and the first gear 14 and The meshing second gear 16 rotates clockwise to eject the tape cassette.

At this time, the idler 12a is rotated counterclockwise, but the second regulating surface 80b and the idler 1
The shaft 12b of 2a contacts and further rotation is restricted. Therefore, the idler 12a and the take-up reel stand 7 do not come into contact with each other, and the reel stand is not driven during the ejection operation of the tape cassette. When the tape cassette is ejected to a predetermined position, the rotation of the capstan motor 30 is stopped.

When loading a tape cassette, the capstan motor 30 rotates clockwise to draw the tape cassette into the VTR from the cassette insertion slot. At this time, the idler 12a is rotated clockwise, but the first regulating surface 80a and the idler 1
The position is regulated by the shaft 12b of 2a coming into contact with it, and it does not come into contact with the supply reel stand 6. Therefore, the reel stand is not driven during the tape cassette loading operation. tape cassette VCR
Once the installation is complete, the capstan motor 3
0 rotation or stop, then loading motor 3
starts operating, and the first slide lever 22 is moved to the right in the figure. Then, the loading motor 3 stops rotating when the mechanism reaches the stopped state shown in FIG. 1, and the VTR enters the standby state. After that, the operation will be controlled according to the operation by the user.

The above-mentioned capstan motor and loading motor are controlled by a microcomputer that constitutes a system control circuit.

The first and second regulating surfaces 80a and 80b are formed so as to obstruct the locus of the idler shaft 12b when they are at a predetermined position, but do not obstruct the movement of the idler 12a at other positions.

(g) Effects of the Invention As described above, according to the present invention, a tape cassette can be moved with a simple configuration in a magnetic recording/reproducing device in which a common motor drives a capstan, a reel stand, and a front loading mechanism. This is effective because it prevents the reel stand from rotating when it is used.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention, and include FIGS. 1 and 2.
3, 4, and 5 are plan views, FIG. 6 is a plan view seen from the front side, and FIG. 7 is a side view of the front loading mechanism. 3... Loading motor, 4... Capstan, 6, 7... Reel stand, 12... Idler mechanism, 12a... Idler, 12b... Idler rotation shaft, 14... First gear, 15... Drive Pulley, 16...Second gear, 17...First belt, 1
8... (first) rotation lever, 21... first cam gear, 22... (first) slide lever, 27...
Idler pulley, 28...Second belt, 29...
...Capstan pulley, 30...Capstan motor, 36...Front loading mechanism, 80...Position regulating means, 80a, 80b...
First and second regulatory aspects.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device in which a common motor is used as a drive source for a capstan for driving a tape at a constant speed, a reel stand drive device, and a front loading mechanism, the first gear provided on the capstan motor and , a rotatably supported pivot lever, a second gear provided at one end of the pivot lever that meshes with the first gear, and means for transmitting rotation of the second gear to the front loading mechanism. and a cam gear having a cam portion that is linked to the rotation of the motor that controls the mode of the mechanism.
comprising a slide lever that engages with the cam portion to move horizontally and whose end abuts the other end of the rotating lever; and means for transmitting rotation of the capstan motor to an idler of the reel stand driving device; A magnetic recording and reproducing device, characterized in that a portion of the slide lever is provided with position regulating means for the idler.