JPH048512Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a cassette attachment/detachment mechanism used in magnetic recording/reproducing devices and the like.

[Conventional technology]

Fig. 5 is a schematic perspective view showing a conventional cassette attachment/detaching mechanism, and Fig. 6 is a schematic perspective view of the main parts of the driving force transmission mechanism.
is the top plate of the cassette attachment/detaching device, 3 and 4 are the side plates of the cassette attachment/detachment device, 5 is an inner box that stores the cassette and moves with the cassette to the normal mounting position, 6 is the drive motor of the cassette attachment/detachment mechanism, and 7 is on the deck base 1. 8 is the shaft of the motor 6; 9 is the ukumu gear; 10 is the worm wheel that meshes with the worm gear 9; 11 is the gear that is mounted coaxially with the worm wheel 10 and rotates together; 12 is the gear 11. 13 is a gear that meshes with gear 12, 14 is a torsion spring, 1
5 is installed coaxially with the gear 13 and has a torsion spring 1.
4, an arm having a groove that is driven by gear 13 to move inner box 5; 16 has gear 1 at one end;
2 is the attached shaft, 17 is the shaft 1
Gear fixed to the other end of 6, 18 is gear 17
A gear 19 that meshes with the arm 15 is an arm having a groove portion that is driven by the gear 18 and is similar to the arm 15 . 20 is a guide groove provided in the side plates 3 and 4; 21
stands up from the inner box 5 and has a guide groove 20 and an arm 15,
A pin is inserted into the groove 19, and 22 represents a cassette.

Note that 23 to 26 are gear systems related to the motor 7, which are not relevant to the explanation here.

Next, the operation will be explained. When the cassette 22 is installed from the insertion slot with the above-described configuration, the rotational movement of the motor 6 is transferred from the shaft 8 to the worm gear 9, the worm wheel 10, and the gears 11 and 1.
2 and transmit the driving force while decelerating the arm 15,
19 is rotated, and the pin 21 moves the inner box 5 along the guide groove 20. When it is detected that the cassette has been installed at a predetermined position on the deck base, the motor 6 is stopped and the installation of the cassette is completed.

When taking out a cassette from a predetermined position on the deck base 1, the motor 6 is reversed, and the arms 15 and 19 move the inner box 5 toward the loading/unloading port via a gear train. to complete the cassette removal.

[Problem that the invention attempts to solve]

Since the conventional cassette loading/unloading device is constructed as described above, dedicated motors are used for the driving force of the cassette loading/unloading device and the driving force of other mechanisms on the deck base. The mechanism is not activated, and when the mechanism on the deck base is activated, the cassette attachment/removal mechanism is not activated. Therefore, there is no overlap in timing, and a dedicated motor is used for each, increasing the number of electrical parts, increasing costs and requiring a large space for the motor installation location.

This idea was made to solve the above problems, and it is possible to use the motor that drives other mechanisms on the deck base to drive the mechanism on the deck base, and also to drive the cassette attaching/detaching mechanism. To provide a cassette attachment/detachment mechanism capable of attaching and detaching a cassette without using any large electric parts such as solenoids.

[Means for solving problems]

The cassette attachment/detachment device according to this invention shares a drive source that drives other mechanisms on the deck base, thereby rotating a three-dimensional cam groove, and a cam-off lowerer arranged to fit into the groove. The lever switches the drive force transmission mechanism provided in the cassette attachment/detachment device, and when the switching clutch is in the ON state, the driving force for cassette attachment/detachment is transmitted from the drive source for other mechanisms, and the switching clutch This is a cassette attachment/detachment mechanism that does not transmit driving force when is in the OFF state.

[Function] The cassette attaching/detaching mechanism of this invention shares the driving force for the cassette attaching/detaching mechanism with the driving force of other mechanisms on the deck base. When the cassette is installed, the driving force transmission clutch remains engaged, the driving force is transmitted, and the cassette can be inserted. When the cassette is in the normal mounting position, release the power transmission clutch. At this time, the clutch switching follower slides on one of the cam grooves by the three-dimensional cam, but the clutch does not operate. By disengaging the clutch, the driving force is transmitted to other mechanisms, but not to the cassette attachment/detachment mechanism.

To take out the cassette, the three-dimensional cam is rotated by the reverse driving force, the clutch switching follower slides on the other groove of the cam by the three-dimensional cam groove, the driving force transmission clutch is turned on, and the driving force is transferred to the cassette attachment/detachment mechanism. and remove the cassette.

[Example of idea]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of this invention, and FIG. 2 is a detailed perspective view of its driving force transmission system, in which the same reference numerals as in the conventional example described above indicate equivalent parts.
In the figure, 7 is a motor that also drives other mechanisms;
23 is a reduction gear system for other drive mechanisms, 24 is a two-stage pulley press-fitted into the rotating shaft of the motor 7, 25 is a pulley of the reduction gear system 23, and 26 is a pulley 2
A belt is hung between 4 and 25, 27 is a pulley that is inserted into the shaft 8 so that it can rotate freely and has a tab on the side, and 28 is a pulley 24, 2.
A belt hung between 7 and 29 is a pawl clutch that rotates together with the shaft 8 and is slidable in the axial direction.
30 is a gear with a three-dimensional cam groove 35 (described later) which is driven by the motor 7 via the gear reduction mechanism unit 23; 31 is rotatably mounted on the deck base 1 and slides along the three-dimensional cam groove 35; A cam follower, 32 is a pin set up on the cam follower 31 and fitted into a cam groove 35; 33 is driven by the swinging of the cam follower 31; the other end is fitted into a groove in the clutch 29, slides the clutch 29, and turns the clutch 29 ON. - A clutch switching lever 34 is used to switch OFF, one end of which is the side plate 3 of the cassette attachment/detachment device.
and the other end is the clutch 29 hooked on the lever 33.
The spring that biases the lever 33 in the OFF direction,
35 is a three-dimensional cam groove that changes the sliding path to the cam follower 31 when the gear 30 rotates forward or reverse; 36 is a holding lever that holds the clutch switching lever 33; In addition, Fig. 7a shows a perspective view of the three-dimensional cam part, and by forming a slope on the bottom of the cam groove that has two parallel paths, the sliding path of the cam follower pin can be changed. This indicates the state in which the

Next, Fig. 7b shows the forward and backward paths of the forward and reverse rotation of the cam, where the radius of curvature r ₁
and r ₂ are given to the cam follower, but
On the return trip, it moves only along the groove with the same radius of curvature _r1 .

Furthermore, FIG. 7c shows the structure of a cam follower that moves along the cam groove shape, and in the figure, 3
2 is a follower pin that can be slid vertically,
37 is a cylinder installed in the cam follower 31 and guides the sliding movement of the follower pin 32; 38 is a compression spring that urges the follower pin 32 downward in the figure; 39 is a cap that seals the spring 38 in the cylinder 37; 40 is a cylinder; This is a rotating support for the cam follower 31.

With the above configuration, when the cassette 22 is glued onto the deck base 1 from the insertion opening, the cassette attachment/detachment device and the clutch 29 are in the state shown in FIG. 3a. Figure b shows the cam gear 30 and cam follower 3.
This shows the relationship with 1. That is, the three-dimensional cam groove 35
The pin 32 at the tip of the driven cam follower 31
is located on the inner peripheral side of the three-dimensional cam groove shape, the other end of the cam follower 31 is separated from the clutch switching lever 33, the clutch switching lever 33 is held by the holding lever 36, and the clutch 29 is in the engaged state.

When the motor 7 begins to rotate normally, the shaft 8 rotates via the pulley 24, belt 28, pulley 27, and clutch 29, and the arms 15 and 19 rotate through the worm gear 9 and gear reduction train. The arms 15 and 19 move the pin 21 attached to the inner box 5 along the guide groove 20, and the inner box 5 containing the cassette 22 moves to the cassette mounting position on the deck base 1.

Further, since the cam gear 30 rotates clockwise in FIG. 3b, the cam follower 31 does not operate due to the three-dimensional cam groove 35. When the cassette reaches the mounting position, the arm 15 moves to the holding lever 36.
By pushing the left end of the clutch switching lever 33, the holding of the clutch switching lever 33 is released, and the clutch switching lever 33 slides the clutch 29 in the OFF direction by the biasing force of the spring 34. After the claws of the clutch 29 and the pulley 27 are disengaged and the clutch 29 is turned off, the motor 7 is stopped and the mounting of the cassette 22 is completed, resulting in the state shown in FIG. 4.

When the motor 7 drives another mechanism on the deck shaft 1, the cam gear 30 rotates further clockwise than the state shown in FIG. 4b, and the cam follower 31
Since the cam groove has a shape such that the clutch 29 remains in the OFF state and the motor 7 rotates, the pulley 27 only idles, and the motor 7 stops from the state shown in FIG. Since the rotation is reversed, no driving force is transmitted to the cassette attachment/detachment mechanism.

When removing the cassette 22, use the cam gear 30.
rotates counterclockwise, the pin 32 moves toward the outer circumference of the three-dimensional cam groove 35, and from the state shown in FIG.
Since the motor 7 rotates in the reverse direction, the cam follower 31 swings clockwise and moves the clutch switching lever 33 in the direction of engaging the clutch 29. When the clutch 29 is engaged, the engaged state is maintained by the holding lever 36, and the cam follower 31 is separated from the clutch switching lever 33, but the driving force of the motor 7 is transmitted, and the arms 15 and 19 move the pin 21 between the side plates 3 and 4. The inner box 5 is driven along the guide groove 20 and moves toward the insertion opening. Inner box 5 to removal position
When this point is reached, the motor 7 stops and the removal of the cassette 22 is completed.

Here, the switching of operations by the three-dimensional cam will be explained in more detail.

With the three-dimensional cam configuration as described above, the cam rotates counterclockwise, so that in the outward path, that is, when removing the cassette, the cam follower 31 moves from the radius of curvature r ₁ to the radius of curvature r ₂ . The clutch 29 is turned on (the power transmission path is connected) by tracing the path using the three-dimensional cam and rotating around the rotating column 40. As the cam rotates further, the cam follower 31 has a radius of curvature.
The clutch 29 returns from r ₂ to r ₁ again, but the clutch 29 can be self-maintained in the on state by the holding lever 36. The removal of the cassette is carried out via the self-retaining clutch 29 using the drive motor 6 as a power source until the removal of the cassette is completed.

When inserting a cassette, the start of cassette insertion is detected by a detection means (not shown), and the drive motor 6 is rotated. At this time, the direction of rotation of the drive motor is opposite to that when the cassette is removed. clutch 29
is in a self-holding state, power is transmitted from the drive motor 6, and the cassette moves in the mounting direction. To complete the insertion, the tip of the arm 15 that drives the cassette presses one end of the holding lever 36 to release the locking pin and release the clutch switching lever 33.
is returned by the biasing force of the spring 34, thereby releasing the self-holding state of the clutch 29. As a result, the power transmission path from the drive motor 6 is cut off, and the cassette operation can be completed even if the drive motor 6 and the cam rotate further. When the cassette is inserted, the movement of the cam follower 31 follows a return path when passing through the three-dimensional cam part, and the cam follower 31 follows the same radius of curvature r ₁
Because of the cam groove, the cam follower 31 does not rotate and remains stationary. Therefore, the clutch switching lever 33 operates without interfering with the cam follower 31, and the clutch 29 is turned off only by the operation of the arm 15.

[Effect of idea]

As described above, according to this invention, the cassette loading/unloading device is inexpensive because the two motors are reduced to one, the space is small, and no other electrical parts are used. This has the effect of providing highly accurate positioning.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a schematic configuration of an embodiment of this invention, Fig. 2 is a detailed perspective view of its driving force transmission system, and Fig. 3a shows the main parts of this embodiment before the cassette is installed. FIG. 3B is a side view, and FIG. 3B is a plan view showing the state of the cam at that time. FIG. 4A is a side view and FIG.
Figure b is a plan view showing the state of the cam at that time.
This figure is a perspective view showing a schematic configuration of a conventional cassette attaching/detaching mechanism, FIG. 6 is a schematic perspective view of a main part of a driving force transmission mechanism of this conventional device, and FIG. 7 is a view showing details of a three-dimensional cam. In the figure, 7 is a drive source (motor), 22 is a cassette, 29 is a clutch mechanism, 30 is a three-dimensional cam (cam gear), 31 is a cam follower, 33 is a clutch switching lever, 35 is a three-dimensional cam groove, and 36 is a clutch holding It is a mechanism (lever). In addition, in the figure,
The same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A drive source that is shared with other mechanisms in the magnetic recording and reproducing device, a clutch mechanism that turns on and off (ON-OFF) the transmission of the driving force from this drive source, and the above-mentioned clutch mechanism except when the cassette is in the normal mounting position. a clutch holding mechanism for holding the clutch in an on state; The cassette is mounted by the forward rotation driving force of the drive source transmitted through the clutch mechanism held in the on state, and when the normal mounting position is reached, the clutch mechanism is turned off and the cassette is removed. The clutch mechanism is turned on by the operation of the cam follower that slides on the three-dimensional cam that is driven in reverse by the drive source that sometimes rotates in reverse;
A cassette attachment/detachment mechanism characterized in that the cassette is detached by the reverse driving force of the drive source.