JPS60237669A - Front loading mechanism of cassette type magnetic recording/reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a home video tape recorder (hereinafter referred to as V
Adopted as a cassette tape attachment/detachment mechanism for cassette tapes such as
There are 11 front-loading structures (the cassette tape is ejected from the front of the VFR body), and in particular, the front-loading system allows the cassette tape to be ejected from the VTR body with a stable and smooth ejecting operation. *Kai ni i! ! It is something to do.

``Prior Art'' In general, the configurations described below are known as the configurations conventionally employed in home VIR 20-introduction mechanisms. FIG. 1 is a front view showing a schematic configuration of the fronting mechanism, FIG. 2 is an exploded perspective view showing the main parts thereof, and FIG. 3 is a side view showing the main parts. In FIG. 1, 1 is a cassette tape;
It is shown mounted in the inner box 2, either about to be mounted into the VTR main body or just taken out. The inner box 2 is configured to be movable along a guide groove 4 formed in the side plate 3, and the side plate 3 and the guide groove 4 allow the cassette tape 1 attached to the inner box 2 to be moved inside the VFR main body. V to guide you to the recording/playback operation position.
It is formed into an rLJ shape by a portion extending substantially horizontally from the front side of the TR main body toward the rear, and a portion extending substantially vertically downward from the rear end of that portion. Further, the engagement between the inner box 2 and the guide 114 is performed by inserting the first pin 5 protruding from the side wall of the inner box 2 into the guide groove 4.

Further, the driving means for moving the inner box 2 along the guide groove 4 includes an arm 6, a first gear 7, a second gear 8, a third gear 9, a worm wheel 11, It mainly consists of a worm 14, a drive motor 15, etc.

Ah! , 6 is formed with an elongated hole 22 in the longitudinal direction, and the first pin 5 is slidably engaged with this elongated hole 22.The arm 6 is connected to the first gear 7 and its It is constructed integrally with the same center of rotation, and swings to move the above-mentioned inner box 2 along the guide groove 4.

The first gear 7 has a second gear. Rotation is transmitted via the third gearwheel 8.9.

As shown in FIGS. 2 and 3, the third tooth 1!9 has
A second bin 10 is erected at a position radially away from the axis between the ends. Further, a worm wheel 11 is provided coaxially with the third tooth *9, and the worm wheel 11 is formed with a window 12 through which the second bottle 10 described above is inserted. This window portion 12 has a length along the circumferential direction so as to allow rotation of the worm wheel 11 by a certain rotation angle relative to the third gear 9 even when the second bottle 10 is inserted. An iron spring 13 is fitted into the common shaft 23 of the third gear 9 and the worm wheel 11, one end of which is connected to the second pin 10, and the other end is connected to the second pin 10. The locking end portions of the worm wheel 11 are respectively locked to hook portions 24 protruding between one ends of the worm wheel 11.

A worm 14 meshes with the worm wheel 11, and the worm 14 is attached to the output shaft of a drive motor 15.

On the other hand, a cam 16 is attached to the first gear 7,
It is configured to rotate integrally with the first gear 7 to open and close a switch 17 that operates the drive motor 15.

Therefore, in the front loading mechanism configured as described above, when loading the cassette tape 1 into the VTR main body, the cassette 1 is inserted into the inner box 2 and pushed into the VTR main body. In response to this movement, the inner box 2 moves along the guide groove 4, and the first bin 5 rotates the arm 6. As the arm 6 rotates, the first gear 7 and the cam 16 rotate.

The open/close position of the switch 17 is set depending on the rotation angle of the cam 16 at this time. Further, the rotation of the first gear 7 is the same as the rotation of the first gear 7. transmitted to the third tooth I'8.9, the third gear 9
The rotation is absorbed by the elastic strain of the iron spring 13 via the second bottle 10. The cassettes 1 to 1 and the inner box 2 are
When pushed into the R body by a predetermined amount, the switch 17 is closed, the drive motor 15 is activated, and its rotation is transmitted to the arm 6 via the gear train, and the rotation is transmitted to the arm 6 via the first pin 5. The inner box 2 and the cassette container are moved along the guide groove 4. The cassette 1 is moved to a predetermined position and set to a recording/playback state.

On the other hand, when taking out the cassette tape 1 from the VTR main body, the drive motor 15 rotates in the opposite direction to that when it was installed, and the arm 6 also rotates in the opposite direction via the gear train (as shown in Fig. 1). (direction rotation). The cullet 1 moves along the guide groove 4 and is ejected from the V -r R main body.

By the way, i when loading and unloading the cassette 1
Focusing on the driving force transmission state between gear 9 and worm wheel 11 of J3, when installed, worm wheel 1
1 rotates once in the counterclockwise direction in FIG. Therefore, one of the windows 12 &ill! Second bin 10 by face
The driving force is rigidly transmitted to the third gear 9. On the other hand, when taking out the worm wheel 1]
rotates clockwise in FIG. Therefore, the second
The bottle 10 is biased by the elastic force of the iron spring 13, and the driving force is transmitted to the third gear 9 elastically.

For this reason, if a fluctuation in frictional resistance occurs between the first bottle 5 traveling in the guide groove 4 and the inner circumferential wall of the guide groove 4, the moving speed of the cassette 1 will be uneven, and the cassette can be taken out stably. could not be done. Particularly, there is a problem in that the resistance increases at the bent portion of the guide groove 4, and the above-mentioned tendency becomes noticeable.

[Summary of the Invention] The present invention has been devised in view of the above-mentioned problems and to effectively solve them.

This invention has a driving force transmission system that is entirely constructed of a rigid transmission mechanism in the operation of taking out a cassette tape from the main body of a magnetic recording/reproducing device such as a VTR, and this enables the front end to take out the cassette tape with stable and smooth movement. The purpose is to provide a loading mechanism.

[Embodiments of the Invention] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 4 is a front view showing a schematic configuration of the front loading mechanism according to the present invention, Fig. 5 is an exploded perspective view showing the main parts thereof, and Fig. 6 is a 71-principal part cutaway side rkJ view showing the main parts. , FIG. 7 is a front view showing the main parts.

Each of Figures 4 and 6 corresponds to Figures 1, 2, and 3 showing the conventional example, and therefore similar configurations are designated by the same numbers. C. Duplicate explanations will be omitted.

As shown in each figure, the worm wheel 11 has a boss portion 25 projecting from the axial center of the end surface opposite to the third gear 9, and the boss portion 25 has a fil! III in the radial direction of the worm wheel 11! II flexible slider 18
is installed. Furthermore, a protrusion 26 is provided at one end of the slider 18. Rails 19 are provided on both sides of the slider 18 to guide its sliding, and as the slider 1B slides along the rails 19, the protrusion 25 is opened in the window 12 of the worm wheel 11. It is configured to appear in parts. Further, a bin 21 is erected on the end face of the slider 18, and a disc 20 equipped with a spiral cam 'a27 into which the bin 21 fits is mounted on the same axis of the worm wheel 11 facing the slider 1B. It is set in. Note that this disc 20 is fixedly installed on the fixed side regardless of the rotation of the worm wheel] and the third gear 9.

Next, the operation of this practical example will be explained.

When attaching cassette tape 1 to the VTR body,
When the cassette 1 is in a state not shown in FIG. 4, that is, when it is about to be pushed into the VTR main body, the slider 1B has its protruding portion 26 at the farthest position from the window portion 12, and the slider 1B is directly connected to the drive motor 15. The rotation of C#! is transferred from the worm wheel 11 to the third gear 9 through the engagement of the window portion 12 and the second pin 10, as in the conventional IT case. l Transmitted sexually. At this time, the slider 18 also rotates as the worm wheel 11 rotates. Therefore, the pin 21 of the slider 18 moves along the cam groove 27 of the disc 20, and the protrusion 26 moves toward the window 12. Projection 26
The first bottle 5 protrudes into the window 12 before reaching the bent part of the guide groove 4 and comes into contact with the second bottle 10, and in this state, the worm wheel 11 is further driven and the movement of the cassette 1 continues. and reaches the installation completion state. This state becomes the initial state at the time of extraction.

When taking out the cassette chip 71 from the VTR main body, the drive [-ta] 15 rotates in the opposite direction, and its rotation is
-C is transmitted to the worm wheel 11 via. A
- The slider 18 also rotates together with the bin wheel 11, and in this state the protrusion 26 comes into contact with the second bin 10.
Driving force is rigidly transmitted between these. Therefore, a rigid driving force transmission system can be maintained during the time when the protrusion 26 and the second pin 10 are in contact, even if the iron spring 13 biases the second pin 10. . Furthermore, as the slider 18 rotates the worm wheel 110, the protrusion 26 moves in the direction away from the window 12, but the contact between the protrusion 26 and the second bottle 10 is caused by the first pin 5 guiding the slider 18. It passes through the bent part of the groove 4 and is maintained until it reaches the horizontal part of the guide groove 4. As the rotation of the drive motor 15 continues, when the first pin 5 passes through the bent part of the guide @ 4, the contact between the protruding part 26 and the second bin 10 is released, and from now on, the second bin 10 is released. 10 is driven by the resilient force of the iron spring 13, and the ejecting operation is completed.

[Effects of the Invention] As is clear from the above description, the present invention provides the following excellent effects.

In other words, in the operation of ejecting a cassette tape from the main body of a magnetic recording/reproducing device such as a VTR, the entire driving force transmission system is constructed using a rigid transmission mechanism, so that the cassette tape is not ejected due to stable and smooth operation. can.

[Brief explanation of the drawing]

Figure '81 is a front view showing the schematic structure of a conventional front loading mechanism, Figure 2 is an exploded perspective view showing the main parts, Figure 3 is a side view showing the main parts, and Figure 4 is a diagram showing the main parts of the mechanism. FIG. 5 is an exploded perspective view showing the main parts, FIG. 6 is a cutaway side view showing the main parts, and FIG. FIG. In addition, in the figure, 1 is the cassette tape, 2 is the inner box, 3 is the side plate,
4 is a guide groove, 5 is a first pin, 6 is an arm, 7 is a first gear as a driven side gear of the gear train, 9 is a third gear as a driving side gear of the gear train, 10 is a second gear bottle, 11 is a worm wheel, 13 is an iron spring as a spring member, 1
4 is a worm, 15 is a drive motor, 18 is a slider, 2
0 is a disk as a cam member, 26 is a protrusion, and 27 is a cam groove. Agent Masuo Oiwa! 81 Figure ≧Jj2! ! A Figure 3 Figure 4 @5 Figure 6

Claims (1)

[Scope of Claims] An inner box for holding a cassette containing a magnetic tape; a first pin protruding from a side wall of the inner box; a side plate that clamps the inner box and is provided with a guide groove that guides and restricts the movement of the box; an arm that engages with the first bin and swings to drive the inner box; and a driven side gear that is attached to the arm. a gear train that engages with the gear train to transmit rotational driving force; a worm wheel that is rotatably attached to a rotating shaft of a driving gear of the gear train; and a worm wheel that is rotatably attached to one end surface of the driving gear The worm wheel is provided in a protruding manner and engages with the worm wheel to transmit the rotation of the worm wheel to the drive side gear, and allows the worm wheel to rotate around the rotation axis within a predetermined rotation angle range. a second bin, one end of which is locked to the worm wheel, the other end of which is locked to the second pin, and the drive side pitcher wheel is attached to move the inner box in the cassette removal direction; In the front loading mechanism of a cassette-type magnetic recording/reproducing device, the front-loading mechanism of a cassette-type magnetic recording/reproducing device is equipped with a spring member that rotates with the worm wheel, and a slider that is mounted coaxially to rotate with the worm wheel and reciprocates in the radial direction along the end surface of the worm wheel. , a protrusion formed at one end of the slider that engages and disengages from the second pin as the slider reciprocates, and a protrusion that is fixed against rotation of the A-arm wheel and engages the slider. 1. A front loading mechanism for a cassette-type magnetic recording and reproducing apparatus, comprising: a cam member that guides the reciprocating motion of the slider as the slider rotates around the worm wheels.