JPH07109682B2 - Cassette loading device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette loading apparatus of a front loading type which can be used in a magnetic recording / reproducing apparatus such as a cassette type video tape recorder.

2. Description of the Related Art Recently, in a cassette loading device of a front loading type video tape recorder, a device has been devised which moves a cassette holder to a predetermined position by using a slide member which linearly reciprocates by a motor.
Hereinafter, a conventional example which is not known and which is considered before embodying the present invention will be described with reference to FIG.

FIG. 7 shows an outline of the configuration of a conventional cassette mounting device which is not known.

In FIG. 7, 1 is a cassette holder for accommodating a cassette, 2 and 3 are side walls integrally formed on both sides of the cassette holder 1, 4 and 5 are guide pins provided on the side walls 2 and 3, and 6 and 7 are Side plates on both sides of the cassette holder 1, 8,
Reference numeral 9 is an L-shaped guide groove provided on the side plates 6 and 7, each of which is composed of two or three guide grooves.
5 are engaged. The guide pins 4 and 5 are guide grooves.
Of course, it is provided corresponding to the number of 8, 9. 1
Drive arms 0 and 11 are connected by a shaft 12 and are rotatably supported on the side plates 6 and 7. The drive arms are rotatably supported by the side plates 6 and 7 on the side wall members 2 and 3 of the cassette holder 1 described above. The main guide pins 4, 5 are respectively engaged. On one side 11 of the drive arm, a gear 15 is integrally formed concentrically with the shaft 12. Reference numeral 16 is a second slide member, and 17 is a first slide member integrally connected to the second slide member by an elastic member 18.

37 is a first hook portion provided on the first slide member 17.
38, and the second hook portion provided on the second slide member 16
It is a second elastic member (high initial tension tension spring) provided between 39, and the hook of the second elastic member 37 is pulled into the holes of the first hook portion 38 and the second hook portion 39 as shown in the drawing. The structure is multiplied. 18 is an end portion 17a of the first slide member 17,
It is a first elastic member whose both ends are locked to the end 16a of the second slide member 16, respectively. The difference in configuration between the first elastic member 18 and the second elastic member 37 is that both ends of the second elastic member 37 are movably locked in the space between the first hook portion 38 and the second hook portion 39. In contrast, both ends of the first elastic member 18 are fixed.

Reference numerals 19 and 20 are first and second elongated guide holes provided in the second slide member, and reference numerals 21 and 22 are third and fourth elongated guide holes provided in the first slide member. 23 and 24 are provided on the side plate 7,
Linear reciprocating movements of the first and second slide members 17 and 16 inserted into the first and third elongated guide holes 19 and 21 and the second and third elongated guide holes 20 and 22, respectively. Is a guide member for guiding. 25 is the second slide member 16
Numeral 26 is a locking hole provided on the first slide member 17 which is inserted into a part of the locking hole 25 so as to be locked. Reference numeral 27 is a first gear portion provided on the second slide member 16 and is driven by being connected to a drive gear 28 which is a drive source of the cassette mounting apparatus. Reference numeral 29 denotes a second gear portion provided on the first slide member, which is the drive arm 11
Is connected to the gear 15 that is integrally provided in the. Reference numeral 30 is a protrusion provided on the first slide member 17, and is engaged with an actuator 32 of a slide switch 31 fixed to the side plate 7.

The structure in which the first and second slide members connected by the elastic member as shown in FIG. 7 are used as a power transmission device improves the operability of the user and locks the motor. It functions as a clutch mechanism that prevents

The conventional non-known cassette mounting device configured as described above will be described below with reference to FIGS. 7 to 10, particularly the operation of the power transmission device section thereof.

FIG. 7 is a schematic perspective view showing the cassette take-out and insertion positions. 8 to 10 show details of the operation of the first and second slide members. FIG. 8 is a view when the cassette holder 1 is in the cassette taking-out and inserting position. At this time, in FIG. 7, the guide pins 5 and 6 provided on the side walls 2 and 3 of the cassette holder 1 are side plates. It is located at a position in contact with the end faces 33 and 34 of the L-shaped guide grooves 8 and 9 provided in 6 and 7. When the guide pins 5 and 6 are in contact with the other end surfaces 35 and 36 of the L-shaped guide grooves 8 and 9, it is a cassette reproducing and recording position. When the cassette is inserted into the cassette holder 1 at the cassette take-out and insertion position shown in FIG. 8 and the cassette is further pushed in, the cassette holder 1 has L-shaped guide grooves 8 and 9 provided on the side plates 6 and 7.
Move along. At this time, the movement is such that the guide pins 5 and 6 provided on the side walls 2 and 3 of the cassette holder 1 and the guide grooves 13 and 14 and the drive arms 10 and 1 provided on the drive arms 10 and 11, respectively.
The first slide member 17 moves via the gear 15 integrally formed with 1.

At this time, since the drive gear 28 is stopped until the slide switch 31 is turned on, the second slide member 16 connected to this drive gear 28 is not operating. Therefore, at this time, The elastic member 18 is a first slide member 17 moving relative to a fixed second slide member 16 as shown in the figure.
Has been extended between.

Since the hook distance l ₁ of the second elastic member 37 is set larger than the distance l ₂ between the first hook portion 38 of the first slide member 17 and the second hook portion of the second slide member 16, Even if the slide member 17 moves, the second elastic member 37 does not expand and moves by the same stroke amount as the first slide member 17, and as shown in FIG.
It does not extend until l ₁ = l ₂ .

Therefore, in the state of FIG. 9, the first slide member 17 and the second slide member 17
Only the elastic tension of the first elastic member 18 acts on the clutch mechanism including the slide member 16, the first elastic member 18, and the second elastic member.

Next, when the cassette is further pushed in as shown in FIG. 10, the first slide member 17 is basically further moved, the slide switch 31 engaged with the first slide member 17 is turned on, and the drive gear 28 is moved to the timepiece. The second slide member 16 moves in the same direction as the moving direction of the first slide member 17 by rotating in the same direction.

After the second slide member 16 has moved to a position where the locking projection 26 provided on the first slide member 17 is in contact with the left end of the locking hole 25 provided on the second slide member 16, the engagement is performed. The first slide member 17 is driven in the direction A by the engagement of the locking hole 25 and the locking projection 26, and the driving force is the driving arm 1
It is transmitted to the cassette holder 1 via 0 and 11, and the cassette holder 1 is driven from the cassette take-out and insertion position to the cassette reproduction and recording position. If the user is
10 If you do not insert the cassette to the position shown in Fig.
The elastic member 18 returns the first slide member 17 to the position shown in FIG. 8, and the cassette holder 1 returns to the cassette taking-out and inserting position.

However, if the cassette is pushed in at a high speed and with a large force with respect to the time actually operated by the motor drive, the first slide member 17
It is considered that the second slide member 16 is actually in the same state as when it is stopped due to a drive loss or the like during the time required to reach the stroke for moving from the position shown in FIG. 9 to the position shown in FIG. To be Therefore, at this time, as shown in FIG. 10, the first slide member 17 extends further than that shown in FIG. 9, and the inter-hook distance l _{1 of} the second elastic member 37 <first hook
The distance l ₂ between 38 and the second hook 39 is reached, and the second elastic member 37 extends only here.

Therefore, in the state shown in FIG. 10, the tension load applied to the first slide member 17 is much larger than that in the state shown in FIG. Moreover,
Since it is added momentarily at any slide stroke position, when the user pushes in the cassette due to the reaction force, through the drive arm 11 and the cassette holder 1,
You will immediately feel an increase in insertion force. This is the first
Whether the right wall 40 of the long hole actually exists in the projection 26 and the long hole 25 that limit the slide stroke between the slide member 17 and the second slide member 16 and limits the slide stroke amount. It is thought that it is acting like this.

If the right wall 40 is present at the position shown in FIG. 9 and the user continues to push in the cassette, the slide limit amount is mechanically reduced by the slide members 16 and 17 in the strokes subsequent to FIG. Move with each other, so that the drive gear 28 receives an overloaded tangential force against an abnormal insertion force, becomes unable to follow when a certain load is exceeded, and is damaged. Therefore, it is ideal that the right wall is in a position where the long hole is made as long as possible, and it is considered preferable from the viewpoint of fulfilling the original function of the clutch mechanism.

As described above, the elastic load increases during the slide, which gives the user a clicking sensation and makes it possible to make the user feel that there is no need to insert it further.
As a result, it is considered that the unnecessary insertion stroke is reduced, and the drive portion which is relatively weak in strength can be protected.

However, in the clutch mechanism of the cassette mounting apparatus as described above, the hook-shaped end portion 37a of the second elastic member 37 shown in FIG. 11A has a hook formed with a hole. Part 38,39
When it is attached to the, the end portion 37a is inserted into the hook portions 38 and 39 while being rotated in the arrow X direction. FIG. 11B shows a state in which the end portion 37a is inserted into the hook portions 38 and 39. In this state, the end portion 37a is pressed against the end portion 37a in the direction of the arrow Y to fix the end portion 37a to the hook portions 38 and 39 as shown in FIG. 11C. here,
Since the above work is not easy to perform, it cannot be carried out by an automatic machine, and it is carried out manually, resulting in a high cost. Further, after the end portion 37a is fixed to the hook portions 38, 39, that is, after the second elastic member 37 is attached to the hook portions 38, 39, the inter-hook distance l _{2 of} the second elastic member 37 Results in variations due to the pressing force applied to the end portion 37a, the non-pressing portion, and the like. This has a problem in that the amount of slide stroke of the first slide member 17 varies.

In view of the above problems, the present invention makes it possible to mount the second elastic member on an automatic machine by forming the first and second hooks in a protruding shape and providing a fall-off preventing member for the second elastic member. At the same time, there is provided a cassette mounting device in which the variation of the inter-hook distance l ₂ after mounting is eliminated and the sliding stroke amount of the first sliding member can be limited to a substantially constant value.

Means for Solving the Problems In order to solve the above problems, a cassette mounting apparatus according to the present invention includes a cassette holder that detachably holds a cassette, a first position at which the cassette holder is detachable, and recording of the cassette. Alternatively, both side plates for guiding reciprocating movement to and from a reproducible second position, and a cassette for driving the cassette holder so as to bring it from the first position to the second position and in the opposite direction. The cassette holder driving means is provided with a holder driving means, and the cassette holder driving means receives a power of a motor to linearly reciprocate and a linear movement of the sliding member is converted into a rotational movement to move to a cassette holder. And a power transmission mechanism that transmits the force as a force, and the slide member is configured to be horizontally movable along a guide member provided on one of the side plates. And a first elastic member having both ends fixed to the first slide member and both ends movable. A cassette mounting device comprising a clutch mechanism including a second slide member connected by two elastic members of a second elastic member and mounted so as to slide on each other, the clutch mechanism comprising: A hook for the second elastic member, which has a spring hooking member composed of a first, a second, and a third locking member having protrusions that allow the second elastic member to be mounted on the first and second slide members. A first locking member that has a diameter larger than the inner diameter of the second elastic member so as not to move the second elastic member in the mounting direction beyond a certain position, and a spring hooking member for the second elastic member. The hook of the second elastic member can move within a specified range A second locking member that is located on the opposite side of the mounting direction of the second elastic member from the position of the first locking member and abuts a blocking member that prevents the second elastic member from falling off; And a projecting third locking member that engages with the blocking member.

Action The present invention has the above-mentioned configuration, and the elastic member can be automatically mounted, which can realize a significant cost reduction, and the amount of sliding stroke of the sliding member can be limited to a substantially constant amount.

Example Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a cassette mounting device according to an embodiment of the present invention. In the figure, the same numbers are assigned to the same names as in the above-described conventional example, and the description thereof is omitted here, and the operation thereof is also omitted.

In FIG. 1 to FIG. 6, 43 is a spring hook of the hook 37a of the second elastic member 37, and is a first spring hook member provided on the second slide member 16, and 44 is a second spring hook member. It is a second spring hook member provided on the first slide member 17 which serves as a spring hook for the hook 37b of the elastic member 37. Reference numerals 41 and 42 denote second springs mounted on the first spring hooking member 43 and the second spring hooking member 44.
Is a blocking member that blocks the elastic member 37 from falling off, 41 is a first blocking member, and 42 is a second blocking member. 43a, 44a
Is the second elastic member 3 attached to the spring hook members 43 and 44.
First, do not move 7 in the mounting direction beyond a certain position.
Is a locking member of. That is, as shown in FIG.
Since the outer diameter of the first locking members 43a, 44a is larger than the inner diameter of the hooks 37a, 37b of the elastic member 37, the hooks 37a, 37b come into contact with the first locking members 43a, 44a. , First
Also, the movement of the second slide members 17 and 16 in the direction is blocked. 43b and 44b provide a certain amount of play in the second elastic member 37 between the blocking members 41 and 42 that prevent the second elastic member 37 from falling off and the first locking members 43a and 44a.
The second locking member serves as a stopper for the blocking members 41, 42. The blocking members 41 and 42 of the 43c and 44c are the second locking members 43b and 44b.
It is a third locking member that prevents the second elastic member 37 from falling off even if it is not in close contact with. Also, as shown in FIG. 4, EF <G
Therefore, the second elastic member 37 does not fall off the second locking member.

The operation of the cassette mounting device configured as described above will be described below.

First, FIG. 2A is a schematic side view of the clutch mechanism, and FIG. 2B.
FIG. 4 is a cross-sectional view of the same, and is a drawing before the second elastic member 37 is mounted. The second elastic member 37 moves in the direction of arrow B by an automatic machine or the like (not shown) and is attached as shown in FIGS. At this time, the hooks 37a and 37b of the second elastic member 37 are respectively inserted into the first spring hooking member 43 and the second spring hooking member 44, and abut on the first locking members 43a and 44a, and the It is installed in the position. Next, when the blocking members 41 and 42 receive an external force from the directions of the arrows C and D, the blocking members 41 and 42 fall from the vicinity of the roots of the blocking members 41 and 42 in the directions of arrows C and D, respectively. At this time, the 4th
The blocking members 41 and 42 shown in FIGS. A and B try to press the hooks 37a and 37b of the second elastic member 37, but the second locking member 43
It is possible to prevent the pressing of the hook portions 37a and 37b by contacting the b and 44b, to cause a certain amount of play in the second elastic member 37, and to obtain a function as a clutch mechanism. FIG. 1 is a schematic side view showing a cassette mounting device equipped with the above clutch mechanism. FIG. 5 is a side view of essential parts showing the cassette take-out and insertion positions, and FIG. 6 is a side view of essential parts showing a state where the cassette is pushed in to some extent. The operation of this embodiment is exactly the same as that of the conventional unillustrated cassette loading device described in FIGS. 7 to 10, and therefore the description thereof is omitted here.

EFFECTS OF THE INVENTION As described above, according to the present invention, an elastic member can be easily attached by an automatic machine or the like, which leads to a large cost reduction, and the slide stroke amount of the slide member can be made substantially constant to improve operability. An excellent effect such as improvement can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a cassette mounting device according to an embodiment of the present invention, and FIGS. 2, 3, and 4 are clutch mechanism portions according to an embodiment of the present invention, and FIG. Drawing, sectional drawing, each drawing B is the sectional view, FIG.5 and FIG.6 is a side view of the principal part for explaining operation | movement of one Example of this invention, FIG.7 is a perspective view of the conventional cassette mounting apparatus. FIG. 8, FIG. 8 to FIG. 10 are side views of the main parts for explaining the operation of the conventional example, and FIG. 11 is an operation explanatory view for explaining the operation of the conventional example. 37 ... Second elastic member, 37a, 37b ... Hook of second elastic member, 41 ... First blocking member, 42 ... Second blocking member, 43 ... First springing member, 44 ... Second spring-hanging member, 43a, 44a ... First locking member, 43b, 44b ... Second locking member, 43c, 44c ... Third locking member.

Claims (1)

[Claims] 1. A cassette holder for removably holding a cassette, and a reciprocating movement of the cassette holder between a first position where the cassette can be attached and detached and a second position where the cassette can be recorded or reproduced. And a cassette holder driving means for driving the cassette holder so as to bring the cassette holder from the first position to the second position and in the opposite direction, and the cassette holder driving means is A slide member that linearly reciprocates by receiving the power of a motor when required, and a power transmission mechanism that converts the linear movement of the slide member into a rotational movement and transmits it to the cassette holder as a moving force. The member includes a first slide member that is horizontally movable along a guide member provided on one of the side plates, and the first slide portion. A first elastic member having both ends fixed to the first slide member and a second elastic member having both movable ends. A cassette mounting apparatus comprising a clutch mechanism having second slide members connected by members and mounted so as to slide with each other, wherein the clutch mechanism comprises the first and second slides. The member has a spring hooking member composed of a protrusion-shaped first, second, and third locking member capable of mounting the second elastic member, and has a larger inner diameter than the hook of the second elastic member. A first locking member having a diameter that prevents the second elastic member from moving in the mounting direction beyond a certain position, and the second elastic member serves as the spring hooking member. After mounting, the hook of the second elastic member is A second member that is movable from the position of the first locking member and is located on the side opposite to the mounting direction of the second elastic member and that abuts on a blocking member that prevents the second elastic member from falling off. A cassette mounting device comprising: a locking member; and a protruding third locking member that engages with the blocking member.