JPH04103335U - Tape cassette loading/unloading device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to reduce manufacturing costs by configuring a cam plate drive mechanism that does not require intermittent gears regarding a tape cassette loading/unloading device including a tape loading mechanism. . [Structure] A cam plate 20 for tape loading is provided. The guide groove 21 for driving the cam plate 20 in the A ₁ -A ₂ direction is
7's revolution direction (D ₁ - D ₂ direction) (C _1
-C2 direction), and a floating portion 21b that is continuous with the displaced portion 21a and includes the orbit of the drive pin 27. Drive pin 2
7 is in the floating portion 21b, the drive pin 27 can revolve without engaging the cam plate 20, so the cam plate 20 can be operated intermittently.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a tape cassette loading/unloading device, and particularly to a tape cassette loading/unloading device. At the same time, tape cassette loading/unloading is performed for tape loading and unloading. Regarding equipment.

0002

[Conventional technology]

Video tape recorder (VTR) or digital audio tape recorder (D A magnetic recording/reproducing device such as AT) is equipped with a tape cassette containing magnetic tape. Then, the magnetic tape is placed on the circumference of the rotating drum from this installed tape cassette. A tape loading mechanism is provided. Also, the recording and playback process is finished, The magnetic tape is returned to the tape cassette by the above tape loading mechanism. After (tape unloading), the tape cassette is automatically In recent years, mechanisms have also become common.

FIG. 5 is a plan view of an example of this type of magnetic recording/reproducing device. The tape cassette loading/unloading device 1 shown in FIG. 5 includes an entire mechanism for not only loading/unloading a tape cassette but also loading and unloading the tape. This tape cassette loading/unloading device 1 is provided with a tape loading mechanism 10 around a rotating drum 3, the main part of which is a single cam plate 2 that moves in the _A1 - _A2 direction. A hook 4 is provided as an eject mechanism for locking a cassette holder (not shown), which is urged to the loading/unloading position by an elastic member, at the above-mentioned tape loading position.

0004 The cam plate 2 is provided with a plurality of guide grooves 2a, 2b, 2c and guide pins 2d. Each tape is loaded onto the guide grooves 2a, 2b, 2c and the guide pin 2d. The seed mechanism parts are engaged (part of the engaged part is not shown in the figure). cam plate 2 moves, each part is displaced along the shape of the respective guide grooves 2a, 2b, 2c. , in which a predetermined tape loading operation is performed.

FIG. 6 is a plan view of a cam plate in a conventional tape cassette loading/unloading device and a cam plate drive mechanism for moving the cam plate in the A ₁ -A ₂ direction. A guide groove 2e is provided at the end of the cam plate 2 (not shown in FIG. 5), and a driving pin 7 provided at a radially protruding portion of the gear 6 is inserted into the guide groove _2e . C It is engaged so that it can move freely in _two directions.

[0006] When gear 8 is rotated clockwise, gear 6 is also rotated clockwise via gears 9 and 11. and the cam plate 2 rotates to A₁-A₂Movement is restricted only in the direction Therefore, the drive pin 7 moves inside the guide groove 2e C.₂While moving the cam plate 2 in the direction A ₁ move in the direction. Cam plate 2 is A₁Move the tape in the direction mentioned above. padding operation is performed. Conversely, when gear 8 rotates counterclockwise, the cam plate 2 is A₂direction, and a tape unloading operation is performed.

On the other hand, the hook 4 is provided so as to move in the direction B _{1 -B 2} in FIG. An ejecting operation is performed to automatically move to the mounting/unloading position.

As described above, in order to perform this ejecting operation continuously with the tape unloading operation, the hook 4 is driven in the _B1 direction using the same rotation of the gear 8 as the cam plate 2 as the driving source. .

That is, when the gear 8 rotates counterclockwise from the completed state of the tape loading operation in which the cam plate 2 has moved to the maximum in the _A1 direction, the cam plate 2 moves in the _A2 direction, and accordingly, the tape loading operation is completed. Various parts operate to take the magnetic tape from the rotating drum 3 into the tape cassette. When the gear 8 continues to rotate counterclockwise from the state in which the magnetic tape is completely taken in (the same state as the tape loading start state), the hook 4 is then moved to perform an ejecting operation.

0010 In this way, the conventional tape cassette loading/unloading device 1 is capable of loading and unloading tapes. There is a play mode for unloading and an eject mode for moving the hook 4. It has a mechanism that continuously operates the 1 and 2 by rotating the gear 8 in one direction.

[0011]

[Problem that the idea aims to solve]

In the eject mode in which the hook 4 is moved, there is no need to move the parts related to the play mode, that is, the mechanical parts for loading the magnetic tape. However, in the tape cassette loading/unloading device 1 configured as described above, since the rotation of the gear 8 and the movement of the cam plate 2 are completely linked, the cam plate 2 continues to move in the _A2 direction even when the hook 4 moves. , the mechanical parts associated with the play mode that are engaged with the cam plate 2 are unnecessarily moved in the direction opposite to that in the play mode. As a result, the above-mentioned mechanical parts that keep moving will interfere with other parts in the magnetic recording/reproducing device, so a space must be provided during the design to avoid this, and tape cassette loading/unloading is necessary. A situation occurs that goes against the trend of device miniaturization.

0012 Therefore, in order to avoid such a situation, in the past, each gear 6, 8, 9, An intermittent gear was used in the 11 part. According to this, there is no intermittent gearing in eject mode. The gear disconnects the gear 8 from the cam plate 2 and moves the cam plate 2. Instead, only the hook 4 could be moved by the continuous rotation of the gear 8.

[0013] However, in this case, it takes time and effort to design, manufacture, and assemble the intermittent gear, and the tape This resulted in a significant increase in the cost of the cassette loading/unloading device.

[0014] Therefore, this invention was devised in view of the above issues, and eliminates the need for intermittent gears, reducing costs. As well as preventing unnecessary operation of the tape loading mechanism as before. An object of the present invention is to provide a tape cassette loading/unloading device which is miniaturized.

[0015]

[Means to solve the problem]

In order to achieve the above purpose, this invention The revolving drive pin is inserted into the guide groove provided in the cam plate, which is capable of reciprocating motion. The cam plate is moved by engaging with the cam plate and driving the drive pin to revolve. In the tape cassette loading/unloading device that loads the tape, The guide groove, a displacement portion having a shape extending in a direction different from the direction of revolution of the drive pin; a floating part that is continuous with the displacement part and has a shape that includes the orbital trajectory of the drive pin; It consists of more.

[0016]

[Effect]

The displacement part of the guide groove has a shape that extends in a direction different from the direction of revolution of the drive pin. , in the revolution range where the drive pin is inside the displacement part, the drive pin moves inside the displacement part. While pressing the end that forms the displacement part, the cam plate, which is supported so that it can reciprocate, Make it move. Then, tape loading is performed.

[0017] The floating part has a shape that includes the revolution locus of the drive pin, so the drive pin does not move freely. The drive pin does not engage the cam plate at all within the floating part during the revolution range within the part. It revolves without Therefore, in the revolution range where the drive pin is in the floating part, for example, drive other parts not related to tape loading, such as the eject mechanism. can be done.

[0018]

【Example】

Figure 1 shows the cam plate used in the tape cassette loading/unloading device of this invention. , and a plan view and a side view of the cam plate drive mechanism, in particular, FIG. 1(A) is similar to FIG. 6. A diagram corresponding to the conventional example shown is shown.

[0019] The feature of the present invention is that the cam plate shown in Fig. 1 can be seen by comparing Figs. 1 and 6. It has the shape of a guide groove 21 provided at the end of the plate 20. Therefore, the cam plate The portion of 20 excluding the guide groove 21 is the same as the conventional cam plate 2 and its structure described above. The purpose is exactly the same. Therefore, the cam play of the part illustrated in FIG. The plate 20 is the same as the cam plate 2, and FIG. 5 shows the tape cassette installation and removal of this embodiment. A device 30 is also shown. The tape cassette loading/unloading device 30 of this embodiment is a tape Not only cassette loading and unloading operations, but also tape loading and unloading. This is a device that includes the entire mechanism that performs this.

The cam plate 20 is provided in the tape cassette loading/unloading device 30 so as to be guided so as to be reciprocally movable in the A ₁ -A ₂ direction as in the prior art, and is driven by a cam plate drive mechanism 22 .

[0021] The cam plate drive mechanism 22 includes a rotationally driven gear 23 and a gear that meshes with the gear 23. 24, a gear 25 provided concentrically with the gear 24, and a gear 2 meshing with the gear 25. 6 and a drive pin 27 provided at a radially protruding portion of the gear 26. It has the same configuration as the conventional cam drive mechanism 5.

[0022] The guide groove 21 provided in the cam plate 20 has a displacement portion 21a as shown in FIG. and a floating part 21b. The width dimension of the displacement part 21 is the same as that of the drive pin 2. The guide groove is slightly larger than the diameter of the cam plate 20 in the direction of movement of the cam plate 20 (A ₁ -A₂direction)₁-C₂located along the direction. C of the displacement part 21a₂The side end portion has a shape that does not communicate with the side portion 20a of the cam plate 20. It is said that

[0023]The C ₁ side end portion of the displacement portion 21a is continuous with the floating portion 21b. This floating part 21b has an end part 21b- ₁ formed along the C1 _{- C2} direction continuously from the _A1 side end part 21a _-1 of the displacement part 21a, and a cam plate 20 located at a predetermined position (Fig. (indicated by P ₁₀ in FIG. 1), an arcuate end portion 21b _-2 is formed along a trajectory drawn by the outermost portion of the revolving drive pin 27. Furthermore, the floating portion 21b is open on the side opposite to the displacement portion 21a toward the side portion 20b of the cam plate 20.

[0024] The drive pin 27 is inserted into the guide groove 21 as shown in FIGS. 1(A) and 1(B). , are movable within the guide groove 21.

[0025] Next, the operations of the cam plate 20 and the cam plate drive mechanism 22 will be explained. do.

FIG. 2 shows a completed tape loading operation in which the cam plate 20 has moved to the maximum in the _A1 direction as described above. In this state, the gear 26 rotates clockwise, and the drive pin 27 passes the position closest to the side part 20a and is on the _A1 side by an angle θ, and is also connected to the upward displacement part 21a in the _C1 - _C2 direction. It is located at the boundary of the floating part 21b. The position of the cam plate 20 in this state in the _A1 - _A2 direction is defined as _P20 .

When the drive motor (not shown) is driven from this state and the gear 23 is rotated counterclockwise, the gear 26 is rotated counterclockwise via the meshing gears 24 and 25, and the drive pin is rotated counterclockwise. 27 revolves counterclockwise. Along with this revolution, the drive pin 27 moves in the _C2 direction and enters the displacement part 21a, and presses the _A2 side end 21a _-2 of the displacement part 21a to move the cam plate 20 in the _A2 direction. urge

The reason why the most clockwise rotated position of the drive pin 27 is set as the boundary position between the displacement part 21a and the floating part 21b as described above is as follows. If the drive pin 27 further revolves clockwise and is in a position closer to the floating part 21b than the boundary position, if the drive pin 27 is revolved counterclockwise from this position as described above, the drive pin 27 does not enter into the displacement part 21a and comes into direct contact with the arc-shaped end 21b _-2 of the floating part 21b, causing a problem that the movement of the cam plate 20 in the _A2 direction does not progress properly. It's for a reason.

As the drive pin 27 continues to revolve in the counterclockwise direction, and from the point in time when θ passes 0 degrees in FIG. 2, the drive pin 27 moves in the _C1 direction while moving the cam plate 20 in the _A2 direction. Make it move. This operation continues until the drive pin 27 moves in the _C1 direction and reaches a drive pin position 27A (shown by a dotted line in FIG. 1) where the drive pin 27 completely exits the displacement portion 21a.

When the drive pin 27 further revolves from the above-mentioned position 27A, the drive pin 27 moves in the _D1 direction as shown in FIG. 1 along the arcuate end 21b _-2 of the floating portion 21b. In this case, since the end portion 21b _-2 is formed along the orbit of the outermost portion of the drive pin 27 as described above, the drive pin 27 is not engaged with the cam plate 20 at all.

Therefore, the movement of the cam plate 20 in the _A2 direction is stopped when the drive pin 27 is at the position 27A. Here, if this stop position is _P30 , the position _P10 of the cam plate 20 when forming the above-mentioned arc-shaped end portion 21b _-2 is defined by the above-mentioned position _P30 . That is, at the position (P ₃₀ ) where the cam plate 20 is moved most in the A ₂ direction necessary for the tape loading operation, the end 21b _-2 of the floating portion 21b is formed along the trajectory when the drive pin 27 is revolved. be done.

In this way, when the drive pin 27 is within the revolution range from the position shown in FIG. 2 to the position 27A shown in FIG. 1, the rotation of the gear 23 and the movement of the cam plate 20 are coupled, The cam plate 20 is moved from P ₂₀ to P ₃₀ by the rotation of the gear 23, and the tape is unloaded (play mode).

[0033] In addition, when the drive pin 27 moves within the floating part 21b, there is contact with the cam plate 20. The connection is broken, but due to the rotation of the gear 23 after the connection is broken, the If the hook 4 shown in 5 is configured to be driven, the ejection movement of the tape cassette is During operation, the mechanical parts that perform tape loading engaged with the cam plate 20 move. (eject mode).

[0034] In this way, according to the tape cassette mounting/detaching device 30 of this embodiment, the cam plate The cam plate 2 can be easily modified by simply changing the shape of the guide groove 21 provided in the cam plate 20. 0 can be operated intermittently, reducing tape cover compared to conventional systems that use intermittent gears. The set mounting/detaching device 30 can be manufactured at low cost. Also, the drive timing of hook 4 Even if the drive stroke changes due to design, only the shape of the guide groove 21 will change. This also used intermittent gears, which could easily accommodate changes by letting It is advantageous in terms of manufacturing cost compared to the conventional method.

Furthermore, when the tape cassette is attached to the tape holder and the tape is loaded, an operation opposite to the above operation is performed. That is, in the revolution range (eject mode) in which the drive pin 27 rotates clockwise (in the _D2 direction) until it reaches the position 27A shown in FIG. 1, the hook 4 is moved in the _B2 direction and the tape holder is brought to the tape loading position. The tape holder is in a locked state (the tape holder is manually moved to the tape loading position). When the drive pin 27 further revolves clockwise from the position 27A, the drive pin 27 moves in the displacement part 21a in the _C2 direction, and presses the _A1 side end 21a _-1 of the displacement part 21a to move the cam plate 20 in the _A1 direction. Make it move. This movement in the _A1 direction moves various mechanical parts for tape loading, and finally the cam plate 20 is moved to the tape loading completed state shown in FIG. 2.

[0036] Here, if a disturbance (such as vibration) is applied when the tape cassette is installed in the cassette holder, a force in the _A1 direction is applied to the cam plate 20, and the backlash of the gears 26, 25, 24, and 23 is The cam plate 20 will be displaced. In this case, in the conventional system shown in FIG. 6, the force F1 that the cam plate 2 applies to the drive pin 7 in the _A1 direction is equal to the force _F1a in the radial direction of the gear 6 and the force _F1a in the circumferential direction, as shown in FIG. The gear 6 is rotated by _{this divided force F 1b .} For this reason, in the past, the cam plate 2 was displaced when the tape cassette was attached, causing various problems.

[0037] However, in the cam plate 20 of this embodiment, as shown in FIG. When the plate 20 is attached to the drive pin 27₁Force applied in direction F₂is the arc-shaped end 21 b_-2The reaction force F due to the slope of_2aThe resultant force is F_2bIt acts on the drive pin 27 as a. Since this inclined portion has a circular arc shape centered on the rotating shaft 26a of the gear 26, the force F _2b acts in the radial direction of gear 26, and gear 26 does not rotate. In this way, this example In the tape cassette loading/unloading device 30, the drive pin 27 is connected to the end portion 21b._-2state above In the state, the gear 26 is connected to the A of the cam plate 20.₁It acts to restrict movement in the direction, Conventional problems when installing tape cassettes can be solved.

[0038]

[Effect of the idea]

As described above, according to the present invention, the shape of the guide groove provided on the cam plate is changed. The cam plate can be operated intermittently with just a simple configuration. The intermittent gear used for this purpose is no longer necessary. This reduces manufacturing costs. In addition, it has been made smaller by preventing unnecessary operations of the tape loading mechanism as before. Accordingly, it is possible to realize a tape cassette loading/unloading device. In addition, the intermittent operation Even if you change the timing or stroke, just change the shape of the guide groove. This can be done with simple work, which also reduces the manufacturing cost of the tape cassette loading/unloading device. This greatly contributes to the reduction of

[Brief explanation of drawings]

FIG. 1 is a plan view and a side view of a cam plate and a cam plate drive mechanism used in a tape cassette mounting/detaching device according to the present invention.

FIG. 2 is a diagram illustrating the operation of the tape cassette loading/unloading device shown in FIG. 1;

FIG. 3 is a diagram illustrating the effects of this embodiment.

FIG. 4 is a diagram illustrating the effects of this embodiment.

FIG. 5 is a plan view of an example of a magnetic recording/reproducing device having a cam plate.

FIG. 6 is a plan view of a cam plate and a cam plate drive mechanism used in a conventional tape cassette loading/unloading device.

[Explanation of symbols]

20 Cam plate 21 Guide groove 21a Displacement part 21b Floating part 22 Cam plate drive mechanism 23, 24, 25, 26 gear 27 Drive pin 27A position (drive pin) 30 Tape cassette loading/unloading device

Claims (1)

[Scope of utility model registration request] 1. A rotating drive pin is engaged with a guide groove provided in a reciprocating cam plate, and tape loading is performed by moving the cam plate by driving the drive pin to revolve. In the tape cassette attachment/detachment device, the guide groove includes a displacement portion having a shape extending in a direction different from the revolution direction of the drive pin, and a displacement portion continuous with the displacement portion and having a revolution locus of the drive pin. A tape cassette attachment/detachment device consisting of a floating part with a shape including: