JPH0215453A - Cassette loading device - Google Patents

Abstract

PURPOSE:To prevent the damage of a driving system due to an overload at the time of cassette insertion by applying click sense against an inserting action at the time of the cassette tape insertion. CONSTITUTION:When a cassette is inserted, a cassette holder 1 moves, a driving arm 11 clockwise turns, and a sliding member 38 to engage with the arm 11 moves. At such a time, a sliding member 40 does not operates, and an elastic member 18 extends at the section of the sliding member 38 moving with respect to the member 40 at such a time. Even when the member 38 moves, an elastic member 37 does not extend, and in such a condition, only the elastic tensile force of the member 18 operates a clutching mechanism consisting of the members 38, 40 and 18 and the elastic member 37. When the motion speed to insert the cassette is fast and the inserting force is large, the elastic member 37 extends. Consequently, when a user inserts the cassette, the increase of the inserting force can be immediately sensed through the arm 11 and the holder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a front-loading cassette loading device that can be used in magnetic recording and reproducing devices such as cassette video tape recorders.

2. Description of the Related Art Recently, in a cassette loading device for a front-loading video tape recorder, a device has been devised in which a cassette holder is moved to a predetermined position using a sliding member that is linearly reciprocated by a motor.

Hereinafter, referring to FIG. 6, an explanation will be given of an unknown conventional example that was conceived before implementing the present invention.

FIG. 6 shows an outline of the configuration of a conventional cassette loading device that is not publicly known.

In FIG. 6, 1 is a cassette holder that stores a cassette, 2 and 3 are side walls integrally formed on both sides of the cassette holder 1, 4 and 6 are guide pins provided on the side walls 2 and 3, and 6 and 7 are The side plates 8.9 arranged on both sides of the cassette holder 1 are L-shaped guide grooves provided in the side plate 6.7, each consisting of two or three guide grooves.
The guide pins 4 and 5 are engaged with each other. In addition,
Of course, the guide pins 4 and 6 are provided in correspondence with the number of guide grooves 8 and 9. Reference numerals 1Q and 11 denote a drive arm connected by a shaft 12 and rotatably supported by a side plate 6.7, and the drive arm is connected to a guide groove 13.14 provided at the tip of the drive arm on the side wall members 2 and 3 of the above-mentioned cassette holder 1. Main guide pin 4,
5 are respectively engaged. One side 1 of the drive arm
1 has a gear 15 integrated with the shaft 12.

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. 19 and 20 are first and second guide slots provided in the second slide member, and 21 and 22 are third and fourth guide slots, respectively, provided in the first slide member. 23 and 24 are provided on the side plate 7, and the first and third
A guide member that is inserted into the guide elongated hole 19.21 and the second and third guide elongated holes 20.22 to guide the linear reciprocating movement of the first and second slide members 17.16. be. 26 is a locking hole provided in the second slide member 16, and 26 is a locking hole provided in the first slide member 17, which is inserted so as to be able to lock with a part of the locking hole 25. It is a protrusion. 27 is the second slide member 1
A first gear section provided at 6 is connected to and driven by a drive gear 28 which is a drive source of the present cassette mounting device. Reference numeral 29 denotes a second gear portion provided on the first slide member, and is connected to the gear 15 provided integrally with the drive arm 11. A projection 30 is provided on the first slide member 17 and engages with an actuator -32 of a slide switch 31 fixed to the side plate 7. A configuration in which the first and second slide members connected by an elastic member as shown in FIG. 6 are used as a power transmission device improves operability for the user and prevents the motor from locking. It functions as a clutch mechanism to prevent

The conventional, unknown cassette mounting device constructed as described above will be described below with particular reference to the operation of its power transmission unit with reference to FIGS. 6 to 10.

7 to 10 show details of the operation of the first and second slide members. FIG. 7 is a diagram when the cassette holder 1 is in the insertion position after increasing the number of cassettes.
At this time, in FIG. 6, the side wall 2 of the cassette holder 1
, 3, the guide pins 6.6 provided on the side plates 6.
End surfaces 33, 34 of L-shaped guide grooves 8, 9 provided in 7
It is located in contact with When the guide pins 6.6 are in contact with the other end surfaces 35, 36 of the cursor-shaped guide grooves 8, 9, the cassette is at the playback and recording position.

When the cassette is inserted into the cassette holder 1 at the cassette removal and insertion position shown in FIG. move along. At this time, the movement is caused by the guide pin 6.6 provided in the side wall hole 3 of the cassette holder 1, the guide groove 13.14 provided in the drive arm 10.11, and the drive arm 10.1.
1 is transmitted to the first sliding member 17 via a gear 15 which is integrally formed with the first sliding member 17 . At this time, the second slide member 16
is locked by drive gear 28. When the power is turned on, when the first slide member 17 moves in the inward direction to the position shown in FIG. 8, the slide switch 31 is activated and the drive gear 28 starts rotating, and the second slide member 16 is driven in the inward direction. Ru.

A locking protrusion 2 is provided on the first slide member 17 at the left end of a locking hole 26 provided on the second slide member 16.
6 to the position shown in FIG.
6 is moved, the first slide member 17 is driven in the inward direction by the engagement between the locking hole 25 and the locking protrusion 26, and the driving force is applied via the drive arm 10.11. The signal is transmitted to the cassette holder 1, and the cassette holder 1 increases the number of cassettes and is driven from the insertion position to the cassette playback and recording position. If the user does not insert the cassette to the position shown in FIG. 8, the first slide member 17 is returned to the position shown in FIG. 7 by the elastic member 18.
The cassette holder 1 returns to the cassette removal and insertion position. When the power is turned off, when the cassette holder 1 is inserted into the cassette holder 1 and pushed in further, the first slide member 17 moves through the position shown in FIG. 8 and then to the position shown in FIG. First slide member 1 on the right end
However, since the second slide member 16 is locked by the drive gear 28, the first slide member 17 cannot move any further and cannot be used. The person will receive resistance as a reaction force. Of course, when the hand is released, the cassette holder 1 returns to the cassette removal and insertion position shown in FIG. 6 by the force of the elastic member 18.

As described above, in most conventional cassette loading devices, one elastic member is used, and as a result, as the user inserts the cassette, the elastic member resists. The insertion force for pushing increases linearly, and the user may insert the locking protrusion up to a stroke where the locking protrusion touches the right end of the locking hole 26.

Problems to be Solved by the Invention However, since the clutch mechanism of the cassette loading device as described above is configured to have no limit on the pushing stroke of the cassette tape, the slide switch for detecting the start of cassette insertion is activated and the motor drive After automatically starting the retracting operation, continue to unload the cassette tape more than necessary.
If you push it in with force, the clutch mechanism and the
There was a problem in that an overload was applied to the slide portion connected to the drive system, and a part of the drive system was damaged.

In view of the above-mentioned problems, the present invention provides a click feeling when inserting a cassette by instantaneously increasing the insertion force required to push in the cassette playback at any stroke after the cassette insertion start detection switch is activated. To provide a cassette mounting device which does not impose a pseudo limit on the stroke of manually pushing a cassette tape, and prevents pushing with an unnecessary overload.

Means for Solving the Problems In order to solve the above problems, the cassette mounting device of the present invention includes a cassette holder that removably holds a cassette;
side plates for guiding the cassette holder so that it can be moved back and forth between a first position where the cassette can be attached and removed and a second position where the cassette can be recorded or played; and a side plate that guides the cassette holder from the first position The cassette holder driving means is provided with a cassette holder driving means that drives the cassette holder in the direction of the second position and in the opposite direction, and the cassette holder driving means is a slide that linearly reciprocates by receiving power from a motor when necessary. and a power transmission mechanism that converts linear motion of the slide member into rotational motion and transmits it to the cassette holder as a moving force, and the slide member is horizontally moved along a guide member provided on one of the side plates. A movable first slide member, a long hole that is engaged with a protrusion provided on the first slide member, and the first slide member, the first elastic member, and the second elastic member. a clutch mechanism having second slide members connected to each other so as to slide relative to each other, and when the cassette holder is in a first position where the cassette can be attached and removed, the clutch The mechanism is characterized in that the elastic force of either the first elastic member or the second elastic member does not act between the first slide member and the second slide member.

Effects of the present invention With the above-described configuration, it is possible to give a click feeling to the resisting insertion operation when inserting a cassette tape, and it is possible to reduce damage to the drive system due to overload when inserting a cassette. be.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows a configuration diagram of a cassette loading device according to an embodiment of the present invention. In the figure, the same numbers as those in the conventional example described above are given the same numbers, and the explanations here will be omitted.

37 is a second elastic member (high initial tension tension spring) provided between the first hook portion 39 provided on the first slide member 38 and the second hook portion 41 provided on the second slide member 4o. It is. Further, the first elastic member 18 is similar to that used in the conventional example, and is mounted between the first slide member 38 and the second slide member 40.

FIG. 1 is a schematic side view showing the cassette ejecting and inserting positions, but the structure and constituent members of the pond in this embodiment are different from those of the conventional, unknown cassette loading device explained in FIGS. 6 to 10 above. Since it is exactly the same as , the explanation will be omitted here.

In Fig. 2, when the cassette is pushed in, the cassette holder 1 that holds the cassette moves, and the cassette holder 1
When the drive arm 11 is rotated clockwise through the pin 5 on the side wall of the drive arm 11, the first slide member 3, which is engaged with the drive arm 11 through the connecting gear 29, moves. At this time, since the drive gear 28 is stopped until the slide switch is turned on, the second slide member 40 connected to the drive gear 28 is not in operation, and therefore, at this time, the first elastic member 18 extends between the first slide member 38, which is moving relative to the fixed second slide member 4q, as shown in the figure.

The hook distance of the second elastic member 37 is 11, which means that the first hook portion 39 of the first slide member 38 and the second slide member 4
Since the distance #12 between the second hook portions is set to be larger than the distance #12 between the second hook portions of o, even if the first slide member 38 moves, the second elastic member 37 does not extend and makes the same stroke amount as the first slide member 38. In case of movement, the second elastic member 37 will not expand to 11=1!2 as shown in FIG.

Therefore, in the state shown in FIG.
This means that only 0 elastic tension is acting.

Up to this point, the operation is similar to that of a conventional mechanism that is not publicly known. Next, as shown in FIG. 4, when the cassette is further pushed in, the first slide member 38 basically moves further, and The slide switch 31 engaged with is turned ON, the drive gear 28 is rotated clockwise, and the second slide member 40 is moved to the first position.
It moves in the same direction as the moving direction of the slide member 17.

However, if the cassette is pushed in at a high speed and with a large force compared to the actual operating time by this motor drive, the first slide member 3
Due to drive loss etc. during the time it takes for 8 to reach the stroke to move from the position shown in Figure 3 to the position shown in Figure 4,
It is considered that the second sliding member 4o is actually in the same state as if it were at rest. Therefore, at this time, as shown in FIG. 4, the first slide member 38 is further extended than shown in FIG. 3, and the distance l between the hooks of the second elastic member 37 is
When the distance between the seventeenth hook 39 and the second hook 41 is 12, the second elastic member 37 expands for the first time.

Therefore, in the state shown in FIG. 4, a much larger tension load is applied to the first slide member 38 than in the state shown in FIG. Moreover, since it is applied instantaneously at any slide stroke position, when the user pushes in the cassette due to the reaction force, the insertion force is increased through the drive arm 11 and the cassette holder 1 as shown in Fig. 6. You will immediately feel it as shown.

This is because the first slide member 38 and the second slide member 4o
protrusion 26 that limits the sliding stroke between
In the elongated hole 26, it is considered that the right wall 42 of the elongated hole actually exists and acts as if it were limiting the sliding stroke amount.

This sliding limit amount is such that if the right wall 42 exists in the position shown in FIG. Since the drive gear 28 moves together with the drive gear 28, the drive gear 28 receives an overload tangential force in response to an abnormal insertion force, and if the load exceeds a certain level, the drive gear 28 becomes unable to follow the load and is damaged. Therefore, it is ideal that the right wall is located at a position where the elongated hole is as long as possible, and it is considered desirable from the standpoint of fulfilling the original role of the clutch mechanism.

As mentioned above, the increase in elastic load during the slide gives the user a clicking sensation, making it possible for the user to think that there is no need to insert it any further.
As a result, it is believed that the unnecessary insertion stroke is reduced, and the driving section, which is relatively weak in strength, can be protected.

The elastic tension of the second elastic member 37 can be freely determined depending on the degree of click feeling, and
The length when no tension is generated in the elastic member 37 of 11. By arbitrarily setting the distance 12 between the hook portions 40 and 41 of the slide member, it is possible to arbitrarily obtain the insertion stroke amount and insertion load that provide a click feeling.

To further explain the relationship between the cassette pushing stroke and the cassette pushing force shown in FIG. 6, the cassette pushing force when the second elastic member starts to obey Hooke's law is F2. When the cassette pushing force by the first elastic member at that time is Fl, the ratio of the cassette pushing force before and after the click feeling is obtained is F1 + F2 / F1, and experimentally the best ratio is about 2 times the cassette pushing force. However, if it is less than this value, the presence or absence of a click will be unclear, and if it is too large, there will be a click, but the drive system will be overloaded, and there is a risk of damaging it, and the feeling will be lost. It's not good, and from an ergonomic point of view, F1+F27F1 was around 2. Further, in the present invention, the first and second elastic members are
By using a high initial tension tension shibane, the pushing force when pushing the cassette to the END of the horizontal stroke can be extremely reduced. If the drive system has a margin against overload, it is of course not necessary to use a high initial tension tensile steel panel.

Effects of the Invention As described above, according to the present invention, it is possible to provide a click feeling when inserting a cassette tape with an extremely simple structure, and prevent damage to the drive unit due to overload caused by abnormal operation during insertion. It is possible to obtain an excellent effect of prevention.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cassette loading device according to an embodiment of the present invention, and FIGS. 2, 3, and 4 are side views of a clutch mechanism section for explaining the operation of an embodiment of the present invention. , FIG. 6 is a relationship between the cassette pushing stroke and the cassette pushing force according to the present invention, FIG. 6 is a perspective view of a conventional cassette mounting device, and FIG. 7 is a diagram showing the relationship between the cassette pushing stroke and the cassette pushing force according to the present invention. FIGS. 8, 9, and 10 are side views showing the operation of a conventional clutch mechanism. 18...First elastic member, 26...Protrusion, 26...Elongated hole, 37...Second elastic member, 38... ...First slide member, 39...
...First hook portion, 4o...Second slide member, 41...Second hook portion. Name of agent: Patent attorney Shigetaka Awano and 1 other person18
---"Saij0shohonshu @pp 27--TEA Tsuba 1

Claims (3)

[Claims] (1) A cassette holder that removably holds a cassette, and a guide that allows the cassette holder to be moved back and forth between a first position where the cassette can be installed and removed and a second position where the cassette can be recorded or played back. and cassette holder driving means for driving the cassette holder to bring it from the first position to the second position and in the opposite direction, and the cassette holder driving means is configured to move as required. The slide member includes a slide member that linearly reciprocates when receiving power from a motor, and a power transmission mechanism that converts the linear motion of the slide member into rotational motion and transmits it to the cassette holder as a moving force. , a first slide member that is horizontally movable along a guide member provided on one of the side plates, and a long hole that engages with a protrusion provided on the first slide member; The cassette holder includes a clutch mechanism including a second slide member connected by a first elastic member and a second elastic member and mounted so as to slide relative to each other, and the cassette holder includes: When the cassette is in the first position where the cassette can be attached and detached, the elastic force of either the first elastic member or the second elastic member of the clutch mechanism is applied to the first slide member and the second slide member. A cassette mounting device characterized in that there is no intervening action. (2) The cassette holder is the first removable cassette holder.
When in position, the distance l_1 between the hooks of the elastic member on which no elastic force acts between the first slide member and the second slide member, and the distance l_1 between the hooks of the first slide member and the second hook portion of the first slide member and the second slide member. 2. The cassette mounting device according to claim 1, wherein the relationship between the distance l_2 of the slide member and the first hook part is l_1>l_2. (3) The cassette pushing force when the elastic forces of both the first elastic member and the second elastic member are acting is F_1+F_
2, and the cassette pushing force immediately before both elastic forces act is F_1, then the tension of the first elastic member and the second elastic member is set so that F_1+F_2/F_1 is at least about 2 or more. The cassette mounting device according to claim 1 or 2, characterized in that: