JPH0462428B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a front loading type cassette mounting device used in a cassette type magnetic recording/reproducing device.

BACKGROUND OF THE INVENTION In recent years, cassette loading devices for cassette tape recording and reproducing devices such as video tape recorders (VTRs) have mainly been of the front loading type, in which the cassette is loaded from the front.

Hereinafter, an example of the above-mentioned cassette mounting device will be explained with reference to the drawings.

FIG. 8 shows the structure of a conventional cassette mounting device.

In Fig. 8, 1 is a cassette holder for storing cassettes, 2 and 2' are side plates arranged on both sides of the cassette holder 1, and 3 and 3' are L-shaped guides provided on the side plates 2 and 2'. In the ditch
Usually each consists of two or three pieces. 4,
Reference numeral 4' denotes a side wall member integrally constructed on both sides of the cassette holder 1, and guide pins 5, 5' that engage with the guide grooves 3, 3' provided in the side plates 2, 2', respectively, are connected to the guide grooves. are provided in accordance with the number of 6, 6' are connected by a shaft 7, and side plates 2,
The transmission gears 8 and 8' are rotatably supported on the side plates 2 and 2', and the transmission gears 8 and 8' constitute gears meshing with the transmission gears 6 and 6', respectively. The main guide pins 5, 5' on the side wall members 4, 4' of the above-mentioned cassette holder 1 are engaged in guide grooves 9, 9' provided at the tip of the drive arm, respectively. 10 is a drive motor fixed to the side plate 2, and 11 is a shaft formed integrally with the worm 12, which is connected to the output shaft of the drive motor 10 through a joint 13 and is rotatably supported by the side plate 2. ing. 14 is a worm wheel that meshes with the worm 12, and 15 is a clutch disk that is connected to the worm wheel 14 so as to be rotatable with respect to each other by a torsion coil spring 16, and is rotatable about a shaft integrally formed on the side plate 2. is supported by A worm wheel 14 is attached to the shaft cylinder portion of this clutch disc 15.
are rotatably fitted, and a small gear 17 is press-fitted and fixed to the shaft cylinder portion of the clutch disk 15 so as to sandwich the worm wheel 14 therebetween. Also, this small gear 17 is the transmission gear 6
It meshes with. Reference numeral 18 denotes a top plate that connects the side plates 2 and 2'. Reference numerals 19 and 20 indicate switch elements attached to the side plate 2 via the mounting bracket 21, which detect the start and end of the rotation stroke of the drive arm 8, but normally require position adjustment. It's normal.

9 and 10 are detailed diagrams of the structure related to the clutch disk 15. That is, the clutch disk 15 has a half-moon-shaped elongated hole 2 provided at a constant angle around the shaft hole 22, concentrically and facing the shaft hole 22.
3, 23' are provided, and the worm wheel 14 is attached to this.
The projections 24 and 24' integrally formed at opposite positions with respect to the center thereof are respectively engaged.
Also, normally the spring 16 is placed so that the elongated holes 23, 23' and the protrusions 24, 24' have a positional relationship as shown by the solid line.
One end is locked to the worm wheel 14, and the other end is locked to the clutch disk 15. Therefore, the opening angle α of the elongated hole 23 or 23' and the protrusion 24
Or the difference from the angle α' of the protrusion 24', that is, α-
The worm wheel 14 and the clutch disk 15 can be rotated relative to each other against the spring 16 by α'. The configuration shown in the detailed diagram of Fig. 2 is as follows:
This is to improve the operability and feeling of operation for the user. 11 to 13 are explanatory diagrams of the operation of the above conventional example. In Figure 11, cassette 25
until the switch is activated and the motor 10 starts rotating, or when the cassette 25 is inserted with the power turned off (OFF), the worm wheel 14 in the locked state engages the cassette holder 1. Only the transmission gear 6 meshing with the drive arm 8 and the clutch disk 15 meshing with the transmission gear 6 are configured to rotate within the range α-α'. Therefore, the power is on, ON)
In this case, when the cassette holder 1 containing the cassette 25 is pushed in slightly against the spring 16, the switch circuit is activated, the drive motor 10 starts rotating, and the worm wheel 14 then rotates via the worm 12. , the protrusion 24 of the worm wheel 14 or the protrusion 24 is connected to the clutch disk 15.
The end face of the upper elongated hole 23 or 23' will be pushed. Therefore, the drive arms 8 and 8' are rotated via the transmission gear 6 that meshes with the small gear 17 integrated with the clutch disk 15, and are engaged with the guide grooves 9 and 9' formed in the drive arms 8 and 8'. The cassette holder 1, which is integrated with the matched guide pins 5, 5', moves from a horizontal movement to a vertical movement along the L-shaped guide grooves 3, 3' of the side plate, thereby completing the cassette mounting operation.

When the power is off, the cassette holder 1 containing the cassette 25 can be pushed in against the spring 16 by a distance corresponding to the rotation angle α-α'. Beyond that, the worm wheel is in a locked state and will experience strong resistance as a reaction force. Furthermore, when the hand is released, the force of the spring 16 returns the cassette holder 1 to its original state.

Next, in FIG. 12, after the cassette is installed, the drive motor 10 rotates in the opposite direction in the ejection mode, but the relationship between the clutch disk 15 and the worm wheel 14 is such that the worm wheel 14 pulls up the clutch disk 15 due to the spring 16. It turns out. Therefore, normally, when the cassette holder 1 containing the cassette 25 is pulled up vertically, the load torque _M1 is applied to the clutch disc 15, so the set torque _M2 of the spring 16 needs to be set to be larger than _M1 . There is. However,
If _M2 is increased, the reaction force generated when the user pushes in the cassette and the switch operates to cause the drive motor 10 to start rotating will increase, resulting in a poor operating feel, so appropriate spring settings are required. be. Also, the rotation angle α- of the drive arms 8 and 8'
The movement area of the cassette holder 1 corresponding to α' is made to be within the horizontal movement section. Also, if an overload is applied when lifting the cassette holder 1 vertically during the ejecting operation, the cassette holder 1 below the drive arms 8, 8' will become locked, and only the worm wheel 14 will move against the spring 16. However, the clutch disk 15 and its parts begin to rotate only after the torque generated by the spring 16 balances the load torque or after the clutch disk 15 and the clutch disk 15 have rotated by the distance α-α'. It is assumed that the motor torque is greater than the load torque, but in any case, smooth operation cannot be expected in such a situation. Therefore, in the conventional example, as shown in FIG. 13, a partially toothed gear 17' having the same diameter as the small gear 17 integrated with the clutch disk 15 is provided integrally with the worm wheel 14, and the transmission gear is used only during vertical operation. meshes with 6,
The structure is such that meshing does not occur during horizontal movement over an area corresponding to the rotation angle of α-α'. Incidentally, in the case of such a configuration, the set torque _M2 of the spring 16 does not necessarily have to be larger than the load torque _M1 applied to the clutch disc, but
It is necessary to ensure that the cassette holder returns to its normal position upon completion of ejection, and that the holder does not move easily when the cassette is stored in the cassette holder even though it is not completely stored. There is a limit to weakening the setting torque of the spring 16 because it is necessary to ensure that the cassette holder containing the cassette is ejected when the magnetic recording/reproducing apparatus is tilted and operated during maintenance or repair service.

Problems to be Solved by the Invention As described in the above conventional examples, conventional cassette mounting devices are generally equipped with a dedicated and expensive drive motor, and are further equipped with a reduction gear to maintain the appropriate rotation speed of the drive arm. It is common to be equipped with equipment, etc.
This has the problem of high cost. or,
In order to improve operability and operational feel, a type of clutch mechanism using a torsion coil spring is provided, but it is necessary to keep the spring force, which affects the operational feel when pushing the cassette and acts as a reaction force, below a certain limit. I couldn't. In addition, since the start/end detection switch for a series of cassette loading and unloading operations is operated by the rotation of an actuator integrated into the drive arm, two switch elements are generally arranged, but delicate position adjustments are required on the assembly line. There was a problem in that this required additional processing, which led to an increase in processing costs.

In view of the above-mentioned problems, the present invention is based on the premise that the capstan drive motor etc. of the magnetic recording/reproducing device itself is generally used, and the dedicated drive motor and reduction gear device are eliminated, and the present invention is implemented in the magnetic recording/reproducing device itself. A two-piece rack that can mesh with a provided output gear is connected to each other by a high initial tension tension spring, and is driven by directly meshing with the drive arm, as well as one switch element that is interlocked with the rack. It has an extremely simple configuration and is inexpensive, and also eliminates the work of adjusting the switch position and uses a high initial tension tension spring to reduce the spring constant. To provide a cassette mounting device that can improve the operational feeling when loading a cassette.

Means for Solving the Problems In order to solve the above problems, the cassette mounting device of the present invention includes a cassette holding member capable of removably holding a cassette, and a cassette holding member provided protruding from both side walls of the cassette holding member. The protrusion is inserted movably,
and a side plate having an L-shaped guide groove for guiding the cassette holding member so that it can be reciprocated between a first position where the cassette can be attached and removed and a second position where the cassette can be recorded or played back. and a cassette holder driving means having a rotatable drive arm that drives the protrusion so as to bring the cassette holding member from the first position to the second position and in the opposite direction;
a first slide member that is movable substantially horizontally along a guide member provided on the side plate, has a convex portion formed in a portion thereof, and is capable of rotating the cassette holder driving means by a certain angle; The protrusion provided on the first ride member has an engaging portion that engages with the convex portion, and is movable along the guide member so as to be connected to the first slide member by an elastic member so as to be able to slide relative to each other. and a second slide member.

Effects The present invention provides an excellent means for significantly reducing assembly man-hours and costs through the extremely simple configuration described above, and improving the user's operational feeling.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the structure of a cassette loading device according to an embodiment of the present invention.

In FIG. 1, 26 is a cassette holder;
7, 27' are side walls integrally formed on both sides of the cassette holder 26, and 28, 28' are side walls 27, 2.
7' is a guide pin, 29, 29' are side plates arranged on both sides of the cassette holder 26,
Reference numerals 30 and 30' designate L-shaped guide grooves provided in the side plates 29 and 29', each consisting of two or three guide grooves, with which guide pins 28 and 28' are engaged, respectively. Note that the guide pins 28, 28' are provided in correspondence to the number of guide grooves 30, 30'.
Reference numerals 31 and 31' denote drive arms connected by a shaft 32 and rotatably supported by the side plates 29 and 29', and the side wall members 27 of the cassette holder 26 described above are inserted into the guide grooves 33 and 33' provided at the tips. The main guide pins 28, 28' on 27' are engaged, respectively. A gear is integrally formed on one side of the drive arm 31 or 31' coaxially with the shaft 32, and is a cassette drive means including the shaft 32. 34 is a first slide member (hereinafter referred to as a first rack), and two guide pieces 35 provided on the side plate 29 or 29'.
35' and has a guide groove formed so as to be horizontally movable, and has several teeth 37 at one end that mesh with a gear 36 integral with the drive arm 31.
and a side plate 29 or 2 at the other end.
It constitutes a bent protrusion that engages with the actuator 39 of the slide switch 38 fixed to the slide switch 9'. Reference numeral 40 denotes a second slide member (hereinafter referred to as a second rack), which, like the first rack 34, has guide pieces 35 and 3 provided on the side plate 29 or 29'.
The second rack 40 and the first rack 34 have an elastic member that engages with a hook portion (hereinafter referred to as a spring hook portion) provided on each of the second rack 40 and the first rack 34. (hereinafter referred to as tension spring) 41
are interconnected by. Also, one end of the second rack 40 is in phase with the teeth provided on the first rack 34, but it has several teeth 42 with a small number of teeth and is bent into an L-shape. At the other end, a first
The rack 34 has teeth 43 extending over the same length as the area of the teeth formed on the rack 34. Reference numeral 44 denotes an output gear provided on the main body of the magnetic recording/reproducing apparatus, and when the cassette mounting apparatus according to the present invention is attached to the main body, the gear is meshed with the teeth 43 of the second rack 40 with the phases aligned in advance. It is something. still,
The second rack 40 has an engaging portion (hereinafter referred to as a rectangular elongated hole) 45 formed therein, and a convex portion (hereinafter referred to as a bending member) 46 formed in the first rack 34 .
in the position in which the side plates 29 or 2 are engaged and abutted against each other, usually by means of tension springs 41.
When the phases of the guide grooves fitted to the guide pieces 35, 35' formed on the second rack 9' match, the second rack 40
square hole 45 and the bending member 46 of the first rack 34
The first rack 34 and the second rack 40 are configured to be able to slide relative to each other by a spatial area of .

Magnetic recording and reproducing devices generally require various drive sources such as a capstan drive, tape loading mechanism drive, and reel stand drive, but due to required performance, cost, etc., dedicated motors are used for each, or a single motor is used. Various configurations have been put into practical use, such as motors that serve multiple functions. Generally, when multiple functions are used, it is necessary to use various clutch mechanisms that use mechanical or electric solenoids to switch the magnitude and direction of the drive motor's output for each function.

FIG. 2 is a block diagram showing an example of the drive system of the magnetic recording/reproducing apparatus in this embodiment. In this embodiment, all operations except the cylinder are performed only by the capstan motor. In Fig. 2, 47 is a direct drive capstan motor, 48 is a first reduction system,
49 is a second reduction system, 50 is a reel stand, 51 is a first clutch, 52 is a third reduction system having a kind of clutch function, 53 is a fourth reduction system, and 54 performs a tape loading operation. Output system, 55 is the second
56 is the fifth reduction system, 57 is the output system of the system that controls the operation mode of each mechanism, 58
numeral 44 represents a sixth reduction system, and numeral 44 represents an output gear connected to the cassette mounting device according to the present invention. The first clutch 51 is used to switch between operations such as cassette mounting and tape loading, and tape running operations. Although not shown, there is a mechanism that connects or cuts off the rotation of the capstan motor in conjunction with the mechanical operation mode control system, and is connected when the tape is running.

Although various other configurations of the drive system described above can be considered, in the case of the present invention, the main purpose is to eliminate the drive motor dedicated to the cassette loading device and utilize the drive source of the magnetic recording and reproducing device. Since the drive system itself is not the objective, details regarding the drive system will be omitted.

3 to 6 are explanatory diagrams of the operation of the cassette loading device constructed as described above.

FIG. 3 shows the state before the cassette is inserted. Here, the slide switch 3 engaged with the first rack 34
8, the position of the actuator 39 is automatically determined and no adjustment is required.

FIG. 4 shows the state in which the cassette is loaded into the cassette holder, the cassette holder is further pushed in, the cassette in switch is activated, and the drive motor starts rotating.

That is, the second rack 40 meshing with the output gear 44 is in its original state, but the first rack 34 meshing with the gear 36 integral with the drive arm 31 is horizontal against the tension spring 41. Moving. Therefore, the reaction force of the tension spring 41 acts on the user, but since the high initial tension tension spring of this embodiment can have a small spring constant, it has a relatively low spring constant compared to the conventional torsion coil spring system. You can get a soft operating feeling.

Furthermore, if the cassette holder 26 containing a cassette is pushed in with the power off, the space corresponding to the square hole 45 of the second rack 40 and the bending member 46 of the first rack 34 corresponds to the space area of the cassette holder. Although it is possible to push in a certain distance below the horizontal motion range, the reaction force by the spring 41 can also be set smaller in this case than in the conventional example.

FIG. 5 shows a state in which the cassette in switch is activated to perform the cassette loading operation. As the output gear 44 rotates, the second rack 40 meshing with the output gear moves horizontally in the direction of arrow a, but the wall of the square hole 45 pushes the bending member 46 of the first rack 34. The drive arm 31 engaged with the first rack 34 will be rotated in the direction of arrow b, and the cassette holder 26 engaged with the drive arm 31 through the guide pin 28 will be moved to the side plates 29, 29'. Horizontal and vertical movement is performed along L-shaped guide grooves 30, 30'.

In the embodiment, the teeth provided on a part of the rack and the gear provided on the drive arm are directly engaged with each other, but it is also possible to engage them through a gear train of at least one gear. You can get the effect. For example, when the rack is used by moving horizontally in a direction opposite to the rotating direction of a gear provided on the drive arm, it is sufficient to engage the rack with one gear. Furthermore, if the gear provided on the drive arm and the shaft cannot be constructed concentrically, two or more gears may be meshed with each other.

FIG. 6 shows a state in which the cassette has been completely installed in a predetermined position. At this point the second lucky 40
Teeth 42 formed at one end of the drive arm 34 and in phase with the teeth 37 on the first rack 34 mesh with a gear 36 integral with the drive arm 31 .

During the ejecting operation of the cassette, each of the above-mentioned components moves in the opposite direction to that during the loading operation, but in the vertical movement section, the teeth 42 on the second rack 40 move in the same direction as the teeth on the first rack 34. Similarly, it is set to mesh with the gear 36 of the drive arm 31. However, in the horizontal movement area of the cassette holder 26 corresponding to the spatial area between the square hole 45 of the second rack 40 and the bent portion 46 of the first rack 34, the teeth 42 on the second rack 40 are not driven. Arm 31
It is necessary to set it so that it does not mesh with the gear 36 of. FIG. 7 is an explanatory diagram of a high initial tension tension spring. Point A indicates the set spring force.

Of course, the structures necessary for the series of operations, such as the mechanism for unlocking and opening the guard lid of the cassette and the mechanism for pressing the cassette when the cassette is completely installed, are the same as those of the prior art, and therefore their explanations will be omitted.

As described above, according to this embodiment, the second gear provided in the magnetic recording/reproducing device is capable of horizontal operation by meshing with the output gear that transmits the output of the drive motor for the device.
By configuring a drive arm equipped with two racks and a gear that meshes with the teeth provided on the first rack, which are interconnected by a tension spring, the cassette device and the ejector can be operated without a dedicated motor. In addition to providing a simple and inexpensive cassette mounting device that can perform a series of operations, the clutch mechanism uses a tension spring with high initial tension, which improves the user's operating feeling and is linked to the linear motion rack. By using a slide switch equipped with an actuator, there is no need to adjust the position of the actuator as in the past.

Effects of the Invention As described above, according to the present invention, with an extremely simple and inexpensive configuration that does not require a dedicated motor or speed reduction system, it is possible to significantly reduce costs, and to reduce the number of man-hours and processes required for adjusting the switch position. This is not necessary, and it is possible to obtain an extremely excellent effect of improving the user's operational feeling.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cassette loading device according to an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a drive system for a magnetic recording and reproducing apparatus according to the present embodiment, and FIGS. 3 to 6 are the same. A schematic side view for explaining the operation of this embodiment, FIG. 7 is a characteristic diagram of a high initial tension tension spring, FIG. 8 is a perspective view of a conventional cassette mounting device, and FIGS. 9 and 10 are conventional examples. FIGS. 11 to 13 are schematic side views of essential parts for explaining the operation of a conventional cassette mounting device. 26...Cassette holder, 28, 28'...
Guide pin, 29, 29'...Side plate, 31,
31'... Drive arm, 34... First rack,
38...Slide switch, 40...Second rack, 41...High initial tension tension spring, 44...Output gear.

Claims (1)

[Scope of Claims] 1. A cassette holding member 26 capable of removably holding a cassette, and protrusions 28, 28' provided on both side walls 27, 27' of the cassette holding member 26 are movably inserted. , and the cassette holding member 26 is in a first position where the cassette can be attached and detached;
Side plates 29, 2 having L-shaped guide grooves 30, 30' for guiding the cassette to reciprocate between the second positions where recording or reproduction is possible.
9', and a rotatable drive arm 31 for driving the projections 28, 28' to bring the cassette holding member 26 from the first position to the second position and in the opposite direction. 31′ and
It moves substantially horizontally along guide members 35, 35' provided on the side plates 29, 29', and meshes with a gear 36 provided integrally with the drive arms 31, 31' to move the drive arms at a certain angle. The first slide member 34 has a first slide member 34 that rotates, and a window 45 that engages with a convex portion 46 provided on the first slide member 34. a second sliding member 40 that moves along the guide members 35, 35' so as to be connected and slidable relative to each other; and a tooth 43 provided at one end of the second sliding member 40.
A cassette mounting device comprising an output gear 44 that meshes with the cassette and transmits the driving force from the drive source. 2 The first slide member 34 is the drive arm 3
The second slide member 40 has teeth 37 in a region that meshes with a gear 36 provided integrally with the drive arms 31 and 31' to rotate the drive arms 31 and 31' by a certain angle. ,3
A tooth 42 having a length corresponding to a rotation angle of 1' is attached to the gear 36.
The cassette mounting device according to claim 1, characterized in that the cassette mounting device is configured in a position that does not mesh with the cassette mounting device. 3 The teeth 43 provided at one end of the second slide member 40 are configured with several teeth that are in phase with the teeth 37 formed on the first slide member 34 and have a smaller number of teeth. A cassette mounting device according to claim 1, characterized in that: 4. The cassette mounting device according to claim 1, wherein the elastic member connecting the first slide member 34 and the second slide member 40 is constituted by a high initial tension spring. 5 has an actuator 39 that engages with and interlocks with a protrusion provided on the first slide member 34;
In addition, the side plate 29 is provided with a switch 38 having a built-in contact capable of detecting the position of the end and end of the operating stroke of the first slide member 34. Cassette loading device. 6 Convex portion 4 provided on first slide member 34
2. The cassette mounting device according to claim 1, wherein reference numeral 6 is formed integrally with the first slide member 34 by bending a part of the first slide member 34.