JPH0677364B2 - Cassette mounting device - Google Patents

Description

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

2. Description of the Related Art Recently, in a cassette loading device for a front loading type video tape recorder, a clutch mechanism including a slide member that linearly reciprocates by a drive motor and an auxiliary slide member for giving a click feeling at the time of insertion is provided. The equipment provided is devised. Hereinafter, regarding a configuration example that was considered before embodying the present invention,
Description will be given with reference to the drawings.

FIG. 4 shows the outline of the configuration of a conventional cassette mounting device which is not known.

In FIG. 4, 1 is a cassette holder for housing a cassette, 2 and 3 are side wall members integrally formed on both sides of the cassette holder, and 4 and 5 are guide pins provided on the side wall members 2 and 3,
6, 7 are side plates arranged on both sides of the cassette holder 1, 8 and 9 are L-shaped guide grooves provided in the side plates 6, 7, each of which is composed of two or three guide pins 4 and 5, respectively. Engaged. The guide pins are, of course, provided corresponding to the number of guide grooves to be engaged, but here,
The description is omitted.

Drive arms 10 and 11 are connected by a shaft 12 and are rotatably supported by the side plates 6 and 7. The drive arms 10 and 11 are mounted on the side wall members 2 and 3 of the cassette holder 1 in the guide grooves 13 and 14 provided at the tips. The main guide pins 4 and 5 are engaged with each other. The drive arm 11 is integrally formed with a gear 15 concentric with the shaft 12.

16 is a second rack which constitutes a slide member,
Reference numeral 17 denotes a first rack integrally connected to the second rack 16 by an elastic member 18 as a first elastic member. 19,2
Reference numerals 0 and 21, 22 denote elongated guide holes provided in the second rack 16 and the first rack 17, respectively, and engage with guide members 23, 24 as guide members provided in the side plate 7, respectively. However, the slide member can be linearly reciprocated. Reference numeral 27 is a first gear portion provided on the second rack 16 and is connected to a drive output gear 28 that controls the drive of the cassette mounting apparatus. In addition, 29 is the first rack
It is a second gear part provided at 17, and is connected to a gear 15 provided integrally with the drive arm 11 to enable movement of the cassette.

As described above, the first rack 17 and the second rack 16 are usually configured as slide members that serve to move the cassette by transmitting the power from the drive motor. However, in the usual cassette mounting device, when the cassette is inserted and ejected, the user may exert an abnormal force or insertion stroke, and a clutch mechanism is provided to protect the drive unit from these. In a similar conventional device which is not known, the locking projection 26 provided on the first rack 17 is
The elastic member 18 pulls so as to lock at one end of a locking hole 25 formed in the rack 16.

Next, the auxiliary slide member provided on the slide member will be described. The reference numeral 37 designates a first elongated hole 40 and a second elongated hole 41 whose horizontal movement is restricted by guide bins 38 and 39 fitted in the first rack 17 and the second rack 16, respectively.
And an auxiliary slide member including the first rack 17 and the second elastic member 42 fixedly acting on one end of the first rack 17. A load means is constituted by 37 auxiliary slide members or 42 second elastic members.

The operation of the clutch mechanism composed of the slide member including the auxiliary slide member will be described below with respect to the conventional cassette mounting device which is not publicly known and is configured as described above.
In FIG. 5, when the cassette is pushed in, the cassette holder 1 holding the cassette moves, and when the drive arm 11 rotates clockwise through the pin 5 on the side wall of the cassette holder 1, the drive arm 11 and the connecting gear 29 move. The engaged first rack 17 moves in the A direction. At this time, since the drive gear 28 is stopped until the slide switch 31 is turned on, the second rack 16 connected to this drive gear 28 remains stationary, so that the first elastic member 18 moves to the first elastic member 18. As shown in FIG. 6, it extends between the stationary second rack 16 and the moving first rack 17. Further, since the second elastic member 42 engaged between the first rack 17 and the auxiliary slide member 37 is applied with a tension larger than that of the first elastic member 18, the second elastic member 42 is engaged with the first elastic member 18. Even if the rack 17 moves, the second elastic member
42 does not extend, so the auxiliary slide member 37 is
It will move the same stroke amount as rack 17 of
As shown in FIG. 6, the first elongated hole 40 of the auxiliary slide member 37
Moves to a position where it touches the guide pin 38 and stops.

Therefore, in the state shown in FIG. 6, the first rack 17, the second rack 16, the auxiliary slide member 37, the first elastic member 18, and the clutch mechanism including the second elastic member 42 have the first rack mechanism. Only the elastic tension of the elastic member 18 is acting. That is, the load force of the load means does not act on the second rack. Next, as shown in FIG. 7, when the cassette is further pushed, basically the first rack 17 is further moved, the slide switch 31 engaged with this is turned on, and the drive gear 28 is rotated clockwise. The second rack 16 rotates and moves in the same direction as the moving direction of the first rack 17.

However, if the cassette is pushed in at a high speed and with a large force, the first rack 17 moves from the position shown in FIG. It is considered that the second rack 16 is actually in the same state as being stopped by the drive loss or the like until the stroke of moving to the position shown in FIG. At this time, as shown in Fig. 7, the first rack
17 extends further than that shown in FIG. 6, and the auxiliary slide member 37 has a guide pin 38 in which the left end of the first elongated hole 40 is inserted into the second rack 16 in the same manner as shown in FIG. Since it is in contact with and is stationary, the inside of the second long hole 41 passes through the first rack 17
The second elastic member 42, whose one end is fixed to the first rack 17, slides for the first time at this point. That is, the load force acts on the second rack by the load means. Therefore, in the state of FIG. 7, the first rack
Since the elastic members 18 and 42 engaged with 17 act against the stopped second rack 16, a tension load much larger than the elastic member tension shown in FIG. 6 is applied to the first rack 17. Further, since it is added instantaneously at an arbitrary slide stroke position, when the user pushes in the cassette, the reaction force of the user immediately feels an increase in the insertion force. This means that in the locking projection 26 and the locking hole 25 that limit the sliding stroke between the first rack 17 and the second rack 16, it is as if the right wall 43 of the locking hole is halfway. It is considered that this is due to the fact that it actually exists, and acts so as to limit the amount of slide stroke.

If the right wall 43 is actually present in the position shown in FIG. 7, and the user continues to push in the cassette, the strokes after FIG. Since the rack 17 moves as a unit, the drive gear 28 receives a tangential force of an overload against an abnormal insertion force, and when it exceeds a certain load, it is impossible to follow it, and it is considered that the rack is damaged.

Further, as described above, the elastic load increases due to the load means during the slide, but this is given to the user as a click feeling, and it is possible to make the user think that it is not necessary to insert it any more. The unnecessary insertion stroke is reduced, and it is possible to protect the drive unit which is relatively weak in strength.

The elastic tension of the second elastic member 42 can be freely determined according to the degree of click feeling, and the gap 44 of the first elongated hole 40 of the auxiliary slide member 37 can be arbitrarily determined to click. There is an advantage that an insertion stroke amount and an insertion load that give a feeling can be arbitrarily obtained. As described above, the gap 44 is a space having a very important meaning, and has the role of reducing the insertion force to a certain extent for the user and protecting the drive unit.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, the clutch mechanism including the first rack, the second rack, and the auxiliary slide member of the cassette mounting apparatus as described above is different in the cassette insertion direction and the cassette ejection direction. , Has the structural drawback that its behavior is not always the same. In addition, the cassette mounting device has a usage environment in which it is handled by human hands as its characteristic, and also has the characteristic that it is used by an unspecified number of people, so a safety mechanism that assumes all usage is assumed. It is necessary to set it.

In the conventional cassette mounting device, the user pushes the elastic load up to the end of the substantially horizontal portion of the L-shaped guide groove of the side plate even though the elastic load increases due to the load means during the slide and the user feels a click feeling. In this case, if the user stops the cassette by hand when ejecting the cassette and repeats an abnormal operation of pushing the cassette shockly against the ejecting operation, the clutch mechanism section and its connection However, there is a problem in that a part of the drive system is damaged due to an overload applied to the drive system transmission section.

In view of the above problems, the present invention expands the clutch effective stroke range formed by the locking holes provided between the first rack and the second rack forming the clutch mechanism, (EN) Provided is a cassette mounting device equipped with a clutch mechanism capable of absorbing or reducing an overload due to an abnormal operation at the time of inserting and ejecting a cassette and protecting the drive unit from damage.

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 and a first position at which the cassette holder is detachable. A side plate having a plurality of L-shaped guide grooves for guiding the cassette so that the cassette can be reciprocally moved to and from a second position where recording and reproduction can be performed, and the cassette holder is provided between the first position and the second position. Direction, and a cassette holder driving means for driving so as to bring it in the opposite direction, and the cassette holder driving means, when required, receives a power of a motor and reciprocates substantially linearly. A power transmission mechanism for converting a substantially linear movement of the slide member into a rotational movement and transmitting the movement to the cassette holder as a moving force. The ride member includes a first rack and a first rack that can move substantially horizontally along a guide member provided on at least one of the side plates.
Has a locking hole that is slidable and engages with a locking projection provided on the rack, and is mounted so as to slide with respect to each other by being connected to the first rack and the first elastic member. A cassette mounting device having a clutch mechanism having a second rack formed therein, and a distance at which the locking hole has a stroke equal to or greater than a substantially horizontal portion of the L-shaped guide groove of the side plate. Only, the locking projection provided on the first rack is set to have a movable length.

Effect of the Invention With the above-described configuration, the present invention satisfies the function as the clutch mechanism and prevents the device from being damaged when any impact force of the user acts in the entire area of the cassette horizontal movement when the cassette is inserted and ejected. The present invention provides an excellent cassette mounting device that prevents the above.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of a cassette mounting device according to an embodiment of the present invention. In the figure, the same numbers are given to the same names as the above-mentioned conventional example, and the description thereof is omitted here. Also, the description of the operation is omitted.

Hereinafter, the operation of the clutch mechanism when the cassette is ejected will be mainly described.

FIG. 2 is a schematic side view showing a state when the cassette is inserted and when the cassette is ejected, and particularly shows a state immediately before the completion of the ejection operation. In this state, as shown in FIG. 2, assuming that the user should grab the cassette by hand, first, the cassette holder 1 holding the cassette and the guide pin 5 provided on the side wall member 7 are engaged. The combined drive arm 11 stops. Further, the operation of the first rack 17 meshed with the second gear portion 29 meshed with the gear 15 provided on the drive arm 11 is stopped. That is, it may be considered that the operation of the cassette and the first rack 17 perform a series of operations.

In this state, if the electrical discharging operation continues, the drive output gear 28 moves the second rack 16 against the first elastic member 18 in the discharging direction. Since the horizontal force of the discharging operation is sufficiently larger than the elastic force of the first elastic member 18, only the second rack 16 operates. That is, the auxiliary slide member 37 and the second elastic member 42 are also stopped. As a result, as shown in FIG. 3, the length 1 of the gap 44 formed by the first elongated hole 40 formed in the auxiliary slide member 37 and the pin 38 mounted on the second rack 16 is eliminated. Drive output gear 28
Therefore, the maximum moving distance of the second rack 16 in the discharging direction is set to be substantially equal to the length l of the gap 44, though it varies somewhat due to variations in various parts such as the gear backflush. Even if it is attempted to move it further in the discharging direction, it cannot move because it is mechanically locked by a part of the power transmission means. At this time, the first rack 17
The gap formed by the locking projection 26 and the locking hole 25 provided in the second rack 16 is also reduced as shown in FIG. This amount of decrease corresponds to the length 1 of the gap 44 described above.

Considering a case where the user forcibly pushes the cassette in the insertion direction in this state, the user is
An insertion force is required to overcome both 18 and the second elastic member 42. In other words, this reaction force is usually large and difficult to push in easily, but theoretically,
In such a state, the locking projection of the first rack 17
The end surface of 26 comes into contact with the right wall of the locking hole 25 provided in the second rack 16, and when the user further pushes in the cassette, the first rack 17 and the second rack 16 are integrated. Then, it tries to move in the direction opposite to the discharging direction. In the conventional configuration, since the drive output gear 28 acts in the discharge direction, forces in opposite directions act on the drive gear 27, and eventually either one of the gears is damaged or meshing occurs. It had the drawback of slipping. Therefore, in this embodiment, in order to protect this, by stopping the cassette by hand at the time of ejection, the distance that the second rack 16 mechanically moves in the ejection direction by the drive output gear 28, that is, the gap 44 is set. The region corresponding to the length is formed by adding to the right wall of the locking hole 25 of the second rack 16. By this, the third
Even if the user pushes in the cassette from the state shown in the figure, all the load applied by the user will be absorbed in the substantially horizontal movement region. That is, as shown in FIG. 3, the region of length L is
This is because it is equal to the length L'corresponding to the horizontal movement stroke of the cassette. As described above, when the cassette is pushed against the driving force when the cassette is ejected, the clutch mechanism is effective from anywhere during the horizontal stroke.

The abnormal insertion operation of the cassette at the time of ejecting the cassette has been described above. Next, the abnormal insertion operation when the cassette holder 1 is at the detachable first position of the cassette will be described. That is, the abnormal insertion operation from the state of FIG. 2 will be described.

As already apparent, the length of the locking hole 25 provided in the second rack 16 is equal to the length L'corresponding to the horizontal stroke of the cassette or cassette holder 1 and the drive output gear 28. Thus, the length of the second rack 16 is the sum of the distances 1 in which the second rack 16 mechanically moves in the maximum direction. Therefore, even if an abnormal operation is performed in which the cassette is pushed in from this state, the locking hole provided in the second rack 16 is provided.
The right rack 25 and the end surface of the locking projection 26 of the first rack 17 have a drive output from the position where the second rack 16 has the cassette holder 1 at the first position where the cassette can be attached and detached. gear
By 28, the maximum mechanical distance l in the discharge direction is
Since it has a stroke, an overload is applied to the clutch mechanism section and the drive system transmission section connected to it,
No part of the drive system is damaged.

Further, in the above-mentioned embodiment, the load means is constituted by the auxiliary slide member 37 or the second elastic member 42, but this load means is capable of applying the insertion force required for pushing the cassette tape. After the cassette insertion start detection switch 31 is actuated, it is momentarily increased at any stroke to give a click feeling when the cassette is inserted, so that there is no pseudo restriction on the stroke for pushing the cassette tape by hand. It is provided for the purpose of preventing a part of the drive system from being damaged so that the overload does not act on the drive system transmission portion by preventing the push-in due to the above overload. According to the present invention, even if the cassette is inserted with an excessive load more than necessary, the drive system transmission portion is not overloaded, and therefore the drive system cannot be partially damaged. That is, the function of the clutch mechanism can be remarkably increased regardless of the presence of the load means, and the drive unit can be protected against abnormal use in any case.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to obtain an excellent effect that the function of the clutch mechanism is significantly increased and the drive unit is protected against abnormal use in any case with an extremely simple structure. it can.

[Brief description of drawings]

FIG. 1 is a perspective view of a cassette mounting apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are side views for explaining the operation of the embodiment of the present invention, and FIG. FIG. 5, FIG. 6, FIG. 6 and FIG. 7 are side views showing the operation of the clutch mechanism portion in the conventional cassette mounting device. 25 …… Locking hole, 37 …… Auxiliary slide member, 38, 39 ……
Guide pin, 40 …… first oblong hole, 41 …… second oblong hole, 42
…… Second elastic member, 43 …… Right wall, 44 …… Gap, 45,46
…… Insertion guide.

Claims (3)

[Claims] 1. A cassette holder for holding a cassette detachably, and a cassette holder for reciprocating 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 and reproduced. To each L
A side plate having a V-shaped guide groove; and a cassette holder driving means for driving the cassette holder so as to bring it from the first position to the second position and in the opposite direction, and The cassette holder drive means receives a power of a motor when required, and a slide member that reciprocates substantially linearly, and a power transmission that converts the substantially linear motion of the slide member into rotational motion and transmits the rotational motion to the cassette holder. A first rack that is movable substantially horizontally along a guide member that is provided on at least one of the side plates, and a locking protrusion that is provided on the first rack. The engaging projection has a locking hole that allows the engaging projection to slide within a certain range, and is connected to the first rack by the first elastic member and slides on each other. In a cassette mounting device having a clutch mechanism having a second rack mounted so as to be mounted, the locking hole is stroke-wise equivalent to the substantially horizontal part of the L-shaped guide groove of the side plate. A cassette mounting apparatus, characterized in that the length is set such that the locking projections provided on the first rack can be moved by the above distance. 2. The locking hole is a position where the second rack can further move the cassette holder in the first position direction of the cassette holder by a power transmission mechanism from the first position where the cassette can be attached and detached. Distance to the side plate L
It is characterized in that the locking projection provided on the first rack is set to a length that allows movement by a distance obtained by adding a substantially horizontal portion of the character-shaped guide groove and a distance equal to or greater than the stroke. The cassette mounting device according to claim 1. 3. The load means of the clutch mechanism has at least one elongated hole which can be moved substantially horizontally by being guided by a plurality of guide portions provided on each of the first rack and the second rack, and which is of a cassette type. A gap is formed between the end portion of the elongated hole and the guide portion at the detachable first position, and the second elastic member having a tension larger than the tension of the first elastic member elastically causes the gap. The first rack and an auxiliary slide member engaged with the second rack are provided, and the locking holes formed in the second rack are slidable in an area where the first rack corresponds to a substantially horizontal movement distance of the cassette. A length that allows sliding and a length that allows sliding for a distance obtained by adding the length of the gap formed between the elongated hole and one of the guide portions are set. Mounting the cassette according to claim 1 or 2. Location.