JPH082829Y2 - Cassette loading mechanism in magnetic recording / reproducing apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a cassette loading mechanism in a magnetic recording / reproducing apparatus such as a video tape recorder, and more particularly to a positional shift of a cassette with respect to a slider when a tape cassette is inserted. Regarding the technology to fix.

<Prior Art> In a cassette loading mechanism of a front loading system in which a cassette holding and holding a cassette is horizontally moved and then vertically lowered to load the cassette, a slider is mounted on both left and right ends of the slider. A pressing spring for pressing the placement cassette against the slider is provided.

<Problems to be solved by the invention> However, when the cassette is slantly inserted into the slider due to a rough operation and deviates from the regular set position, the cassette remains in the slanted state. There was a risk that it could not be loaded correctly in the regular loading position. Even when the cassette is set to the regular set position of the slider, if the holding spring is weak, the cassette will deviate from the regular set position on the slider due to the acceleration generated especially at the beginning of the horizontal movement of the slider. There was a risk that it could not be loaded correctly in the regular loading position.

If the spring force of the pressing spring is increased to prevent the displacement, the insertion resistance of the cassette with respect to the slider increases, and the insertion operation becomes heavy, which causes the operability to deteriorate.

Therefore, in order to prevent the displacement of the cassette due to the acceleration generated at the initial stage of the horizontal movement of the slider and to reduce the insertion resistance of the cassette as much as possible, the spring force of the pressing spring must be set with high accuracy. However, it is not easy considering variations in manufacturing and mounting.

The present invention was devised in view of such circumstances, and it is not necessary to set the spring force of the pressing spring with high accuracy, and moreover, the operability of inserting the cassette is improved, and the rough operation is performed. It is an object of the present invention to ensure that the slider can be set to a regular setting position even if it is inserted.

<Means for Solving the Problem> In order to achieve such an object, the present invention has the following configuration.

That is, the cassette loading mechanism in the magnetic recording / reproducing apparatus of the present invention comprises a slider for mounting the inserted cassette and moving it to the loading position, and pressing springs provided at both left and right ends of the slider for pressing the cassette against the slider. In a cassette loading mechanism including: a roller arm, a base portion of which is rotatably supported in the vicinity of the pressing spring, and a free end of each of the roller arms, which is rotatably supported on both left and right ends of the slider. A roller and a spring that urges each roller arm to a predetermined position are provided, and each roller is mounted on a moving path of the slider so as to move each roller inside against the urging force of the spring. And a cam member that is pressed against the left and right side surfaces of the cassette to be displaced.

<Operation> The operation of the above configuration of the present invention is as follows.

When the slider on which the cassette is placed moves, the left and right rollers also move at the same time, and when these rollers run on the cam member, they are displaced inward and pressed against the left and right side surfaces of the cassette.
In this state, the roller rolls on the cam member, so that the rotational force of the roller pushes the cassette all the way to the back of the slider and sets it at the proper set position on the slider.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings.

First Embodiment FIG. 1 is a plan view of a cassette loading mechanism, FIG. 2 (a) is a sectional view of a slider at an intermediate position, FIG. 2 (b) is a side view, and FIG. Is a plan view and FIG. 4 is a side view thereof.

Left and right frames 2a, 2b erected on the chassis 1 are connected by a top plate (not shown). As shown in FIG. 2, a pair of L-shaped guide holes 3a and 4a are formed in the left frame 2a.
And a pair of L-shaped guide holes 3b and 4b are similarly formed in the right frame 2b. A down guide 5 that guides the cassette m when it descends is laid between the frames 2a and 2b.

Slider 6 for mounting and moving the inserted cassette m
Has stoppers 7a, 7b for receiving the inserted cassette m near both ends on the inner side, and holders 8a, 8b for guiding the insertion of the cassette m are provided at both left and right ends, as shown in FIGS. 3 and 4. It is provided. On the outer surface of the left holder 8a, a pair of guide shafts 9a, 10a slidably inserted and locked in the guide holes 3a, 4a of the left frame 2a are provided to project laterally outward, and similarly. , On the outer surface of the right holder 8b,
A pair of guide shafts 9b, 10b slidably inserted and locked in the guide holes 3b, 4b of the right frame 2b are provided to project laterally outward.

By inserting and locking these four guide shafts in the guide holes, the slider 6 is held in a horizontal posture, and the slider 6 is guided along the guide holes.

The guide shafts 9a, 9b on the front side are configured to be longer than the guide shafts 10a, 10b on the back side, and also project outward from the outer side surfaces of the frames 2a, 2b. Pressing springs 11a and 11b for pressing the inserted cassette m against the slider 6 are provided on the upper portions of the inner surfaces of the holders 8a and 8b.

As shown in FIGS. 1 and 2, a U-shaped engagement in which grooves are formed on the outer surface of each frame 2a, 2b for engaging the protruding portions of the front guide shafts 9a, 9b, respectively. Drive gears 13a, 13b integrally attached with the parts 12a, 12b are rotatably supported, and timing gears 14a, 14b meshing with the drive gears 13a, 13b are also rotatably supported. Both timing gears 14a, 14b are fixed to both ends of a main shaft 15 spanned between both frames 2a, 2b, and rotate in synchronization.

The worm gear 17 is meshed with the worm wheel 16 that is linked to the right drive gear 13b through a well-known double-acting mechanism (not shown) and is axially supported by the right frame 2b.The worm gear 17 is the worm shaft 18, It is interlocked with a loading motor (not shown) via a pulley 19 and a belt (not shown).

The right frame 2b is provided with a switch lever 20 which is rotated by the rotation of the right drive gear 13b when the cassette m is pushed into the slider 6 and the loading motor (not shown) which is closed by the rotation of the switch lever 20. A loading switch 21 for driving and an open lever 22 for opening a guard panel (front cover) of the cassette m are provided. In FIG. 1, the switch lever 20 and the loading switch 21 are omitted.

The chassis 1 is provided with a pair of positioning pins 23a and 23b for regulating the position of the cassette m at the regular loading position and a pair of cassette stays 24a and 24b. The positioning pins 23a and 23b engage with the reference holes 25a and 26b at the bottom of the cassette m, and the cassette stays 24a and 24b are the cassette m.
It supports the bottom of the.

The above configuration is the same as that of the conventional example, but the present example further includes the following configuration.

As shown in FIGS. 3 and 4, roller mounting holes 26a, 26b are formed in the left and right holders 8a, 8b of the slider 6, and the roller arms are attached to the support shafts respectively planted in the roller mounting holes 26a, 26b. Bases of 27a and 27b are rotatably supported, and rubber rollers 28a and 28b are rotatably supported by roller shafts respectively planted at the free ends of the roller arms 27a and 27b.
Each roller arm 27a, 27b is biased to a predetermined position on the outer side in the left-right direction by a spiral spring (not shown). This predetermined position is selected as a position separated from the left and right side surfaces of the cassette m when the rollers 28a, 28b are not riding on the cam members 29a, 29b described later.

As shown in FIGS. 1 and 2, a trapezoidal cam member for letting the rollers 28a, 28b ride on each of the left and right frames 2a, 2b in the vicinity of the starting end of the horizontal movement path of the slider 6. 29a and 29b are attached. The cam members 29a, 29b are configured to displace the roller arms 27a, 27b inward in the left-right direction as the rollers 28a, 28b run up, and press the rollers 28a, 28b against the left and right side surfaces of the cassette m.

Next, the operation of the cassette loading mechanism according to the first embodiment will be described.

In order to clarify the comparison with the conventional example, first, the roller
The operation assuming that there is no cam 28a, 28b and the surrounding structural parts and the cam members 29a, 29b, that is, the operation in the same configuration as the conventional example will be described.

When the cassette m is inserted into the slider 6, the cassette m is pressed against the slider 6 by the pressing springs 11a and 11b. Set the cassette m to the stoppers 7a and 7b of the slider 6.
The slider 6 is initially moved by inserting the slider 6 until it comes into contact with and further pushing it.

Since the guide shafts 9a, 9b protruding from the left and right holders 8a, 8b of the slider 6 are engaged with the U-shaped engaging portions 12a, 12b provided on the drive gears 13a, 13b, A rotational torque is given to the drive gears 13a and 13b by the movement. The worm wheel 16 is not rotated because the worm gear 17 meshes with the worm wheel 16, but the right drive gear 13 connected to the worm wheel 16 via a double-acting mechanism.
b is rotated while extending the double-acting mechanism by the applied rotation torque. At the same time, the drive gear 13a on the left side is also rotated.

The switch lever 20 is rotated by the rotation of the drive gear 13b on the right side, whereby the loading switch 21
Is turned on and the automatic loading operation is started. That is, the loading motor (not shown) is driven, the pulley 19 is rotated through the belt (not shown), and the worm shaft 18
Also, the worm wheel 16 is rotated via the worm gear 17, and the right drive gear 13b to which the rotational torque is applied from the worm wheel 16 is driven and rotated. When the right drive gear 13b is rotated, the left drive gear 13a is rotated in synchronization with the right drive gear 13b via the timing gear 14b, the main shaft 15, and the timing gear 14a.

When both drive gears 13a and 13b rotate in synchronization, the left and right U-shaped engaging portions 12a and 12b also rotate, and the guide shafts 9a and 9b are pushed by the rotation, so that the slider 6 holding the cassette m is moved. Move toward the back. The movement of the slider 6 is such that the guide shafts 9a, 9b are guided by the guide holes 3a, 3b and the guide shafts 10a, 10b are guided by the guide holes 4a, 4b.

That is, the guide shaft moves horizontally and then vertically along the L-shaped path formed by the guide holes. In the process of shifting from horizontal movement to vertical movement, the rear surface of the cassette m is guided by the down guide 5, and the guard panel m _{1 on} the front surface of the cassette m is opened by the open lever 22 as shown in FIG. The open lever 22 is
While the opening motion of the guard panel m _1, retracts back side by being pushed by the guard panel m _1.

In the final step of the vertical movement of the slider 6, as shown in FIG. 7, the reference holes 25a, 25b of the cassette m held by the slider 6 are fitted into the positioning pins 23a, 23b, and the bottom of the cassette m is It is supported by the stays 24a and 24b, so that the cassette m is loaded in the regular loading position.

The ejection of the cassette m is performed by the reverse operation of the loading.

By the way, when the cassette m is inserted into the slider 6 due to a rough operation when the cassette m is inserted into the slider 6, the cassette m is loaded in the inclined state. As a result, it will be loaded in a state where it deviates from the regular loading position. Even if the cassette m can be inserted into the regular set position of the slider 6, even if the cassette m is deviated from the regular set position due to the initial acceleration of the horizontal movement of the slider 6, the cassette m is similarly loaded into the regular load position. I can not do it.

By the way, in order to eliminate such an inconvenience, the rollers 28a, 28b which are displaceable in the left-right direction and the rollers 28a, 28b
There are provided cam members 29a and 29b for riding on.

Next, the operation of the present embodiment including the rollers 28a, 28b and the structural parts around them and the cam members 29a, 29b will be described.

Insert the cassette m into the slider 6 and further push it in to move the slider 6 initially.
Switch lever 2 by rotation of the right drive gear 13b
The 0 is rotated to turn on the loading switch 21 to start the automatic loading operation. At the stage of the initial movement of the slider 6, the left and right roller arms 27a, 27b are urged outward in the left and right direction by unillustrated spiral springs, so that the left and right rollers 28a, 28b are separated from the left and right side surfaces of the cassette m. are doing.

Left and right drive gears 13a, 13b with automatic loading start
The guide shafts 9a, 9b of the slider 6 are guided to the guide holes 3a, 3b by the rotation of the U-shaped engaging portions 12a, 12b due to the synchronous rotation of the slider 6, and the slider 6 starts horizontal movement.

At the initial stage of this horizontal movement, as shown in FIGS. 5 and 6, the rollers 28a, 28b ride on the cam members 29a, 29b, and the roller arms 27a, 27b move in the left-right direction against the spiral spring. The rollers 28a, 28b are displaced inwardly and are pressed against the left and right side surfaces of the cassette m. With the horizontal movement of both rollers 28a, 28b integrated with slider 6, both rollers 28a, 2b
8b is rotated by receiving frictional resistance from the cam members 29a, 29b.

Then, the roller 28a on the left side is rotated counterclockwise,
The right roller 28b is rotated clockwise. Each roller 28
The rotational torque received by the cam members 29a, 29b by the a, 28b is applied to the side surface of the cassette m on which the rollers 28a, 28b are in pressure contact, and the peripheral speed of each roller 28a, 28b on the side surface of the cassette m is determined by the slider. Since it is twice the moving speed of 6, the cassette m is pushed inward on the slider 6.

Therefore, even if the cassette m is obliquely inserted into the slider 6 for a rough operation, or the cassette m is moved due to the acceleration generated at the beginning of the horizontal movement of the slider 6 when the loading motor starts to be driven. Even if the cassette m is deviated from the regular set position, the cassette m can be correctly set to the regular set position on the slider 6 by pushing the cassette m by the right and left rollers 28a and 28b. As a result, the slider 6
By vertically moving the cassette m, the cassette m can be reliably loaded into the regular loading position where the reference holes 25a and 25b of the cassette m fit into the positioning pins 23a and 23b.

Therefore, the spring force of the pressing springs 11a and 11b for pressing the cassette m against the slider 6 may be set low, and the insertion resistance of the cassette m into the slider 6 becomes small, so that the insertion operation can be easily performed with a small force.

Then, during the ejecting operation of the cassette m by the reverse rotation of the loading motor, the left roller 28 is reversed in the state of riding on the cam members 29a and 29b, contrary to the loading operation described above.
Since a is rotated in the clockwise direction and the right roller 28b is rotated in the counterclockwise direction, the cassette m on which the rollers 28a, 28b are in pressure contact is pushed on the slider 6 in the direction away from the stoppers 7a, 7b. As a result, when the ejection is completed, the cassette m is further out of the position shown in FIGS. 1 and 2, and it becomes easier to grasp the cassette m by hand when the cassette m is taken out.

Second Embodiment Next, a second embodiment will be described with reference to FIG.

In the case of the above-described first embodiment, when the cassette m is set to the regular set position of the slider 6 from the beginning, and when the cassette m is corrected to the regular set position by the pushing operation of the rollers 28a and 28b, the cassette m Since the position of m is regulated by the stoppers 7a and 7b of the slider 6, the rollers 28a and 28b do not rotate and slip on the cam members 29a and 29b, which causes frictional resistance to the movement of the slider 6. The second embodiment is designed to eliminate this frictional resistance.

The free ends of the roller arms 27a, 27b are swingably supported in the roller mounting holes 26a, 26b of the holders 8a, 8b via a support shaft and are urged outward in the left-right direction by a spiral spring. Both are small rubber rollers 30a, 30b
And large diameter rollers 31a, 31b are rotatably supported, and torque limiters 32a, 32b are interposed between the small diameter rollers 30a, 30b and the large diameter rollers 31a, 31b. The small-diameter rollers 30a, 30b contact only the cam members 29a, 29b, and the large-diameter rollers 31a, 31b contact only the side surfaces of the cassette m.

Since other configurations are similar to those of the first embodiment, the same reference numerals are given to corresponding portions, and the description thereof will be omitted.

According to the second embodiment, when the cassette m is displaced on the slider 6, the small diameter rollers 30a and 30b roll on the cam members 29a and 29b, so that the torque limiters 32a and 32b are moved. Large-diameter rollers 31a, 31b rotate through
The rotational torque is applied to the left and right side surfaces of the cassette m, and the cassette m is pushed inward on the slider 6 until it abuts the stoppers 7a and 7b.

After this, the large diameter roller 31a, which is in contact with the cassette m,
Although 31b does not rotate, these large diameter rollers 31a and 31b are cam members.
Since it is not in contact with 29a, 29b, it does not provide frictional resistance against the movement of the slider 6. Further, since the small diameter rollers 30a, 30b are coupled to the large diameter rollers 31a, 31b via the torque limiters 32a, 32b, even if the large diameter rollers 31a, 31b are in a rotation stopped state, the small diameter rollers 30a, 30b will not Since it rolls on the cam members 29a and 29b, frictional resistance against the movement of the slider 6 does not occur, and the slider 6 can be moved smoothly.

<Effects of the Invention> According to the present invention, the following effects are exhibited.

Rollers mounted on the left and right sides of the slider ride on the cam members to displace the rollers inward in the left-right direction to press the left and right side surfaces of the cassette into pressure, and the cam members apply rotational torque to the rollers, which causes the cassette to rotate the cassette. Since the cassette is pushed all the way in on the slider, the cassette is inserted at an angle to the slider, or the cassette deviates from the slider due to the acceleration when the slider starts moving. Even if the cassette is pushed by the roller, the cassette can be set to the regular setting position on the slider, and the slider can be moved to reliably load the cassette to the regular loading position.

Since the displacement of the cassette due to the acceleration when the slider starts to move is corrected as described above, it is not necessary to set the spring force of the pressing spring that presses the cassette against the slider with high precision, and this spring force should be set small. Thereby, the insertion resistance of the cassette with respect to the slider can be reduced and the operability of insertion can be improved.

Moreover, the roller arm supporting the roller is urged to a predetermined position by the spring, and the roller is located away from the side surface of the cassette until the roller rides on the cam member. It does not hinder the insertion of the insert and does not hinder the operability of the insert.

When ejecting, the cassette is pushed on the slider in the ejection direction by reversing the rollers, so that the cassette can be easily grasped by hand, and the operability of taking out the cassette can be improved.

[Brief description of drawings]

1 to 7 relate to a first embodiment of the present invention.
The figure is a plan view of the cassette loading mechanism, FIG. 2 (a) is a cross-sectional view of the slider at an intermediate position, FIG. 2 (b) is a side view, and FIG.
FIG. 4 is a plan view of the slider, which is partially broken, FIG. 4 is a side view thereof, FIG. 5 is a plan view, which is partially broken and partially omitted, for explaining the operation, and FIG. 6 is a part corresponding to FIG. FIG. 7 is a side view showing a cassette loading completed state, with a cross-sectional view with a fracture and a part omitted. FIG. 8 is a partially cutaway front view of the main part of the cassette loading mechanism according to the second embodiment. m: cassette, 6: slider, 11a, 11b ... pressing spring, 28a, 28b ... roller, 29a, 29b ... cam member, 30a, 30b ... small diameter roller, 31a, 31b ... large diameter roller,
32a, 32b ... Torque limiter

Claims (1)

[Scope of utility model registration request] 1. A cassette loading mechanism comprising sliders for mounting an inserted cassette and moving the cassette to a loading position, and holding springs provided at both left and right ends of the slider for pressing the cassette against the slider. At the left and right ends of the roller arm, roller bases rotatably supported at positions near the pressing springs, rollers rotatably supported by free ends of the roller arms, and the roller arms at predetermined positions. A spring for urging the roller is provided, and by moving the rollers on the moving path of the slider, the rollers are displaced inwardly against the urging force of the spring to be pressed against the left and right side surfaces of the cassette. A cassette loading mechanism in a magnetic recording / reproducing apparatus, characterized in that a cam member is provided.