JPH0215452A - Cassette loading device - Google Patents

Abstract

PURPOSE:To make sure and smooth a series of the actions of cassette loading and extraction by providing an auxiliary force applying means to assist the turning force of a driving arm. CONSTITUTION:An output gear 47 rotates, a driving arm 31 rightward turns, and a cassette holder 26 horizontally then vertically moves along an L-shaped guide groove 30. When a guide pin 28 further moves in a guide groove part 30b direction, the driving arm 31 starts abutting on a control lever 44. Since turn energizing force (c) reverse to the turning direction of the arm 31 is applied to the lever 44 by an elastic member 45 to constitute an auxiliary force applying means, the moving speed of the holder 26 is decelerated. Consequently, sharp fall is not generated. Next, at the time of the extraction of the cassette, the arm 31 vertically and horizontally moves along the groove 30 in the direction reverse to that at the time of the former cassette loading, and it is extracted. The turn energizing force generated by the member 45 operates the arm 31 in an arrow (c) direction. Next, at the time of the horizontal direction movement of the holder 26, since the elastic member 41 serves as a clutch mechanism, the force more than necessity is not transmitted to the holder 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 apparatuses such as video tape recorders (hereinafter referred to as 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 described with reference to the drawings.

FIG. 9 shows the configuration of a conventional cassette loading device which is not known and which is prior to the improvement of the present invention.

In Fig. 9, 1 is a cassette holder that stores a cassette, 2.2' is a side plate placed on both sides of the cassette holder 1, and 3.3' is an L-shaped guide provided on the side plate 2.2'. A groove, usually consisting of two or three grooves each. Reference numerals 4 and 4' designate side wall members formed on both sides of the cassette holder 1, each having guide pins 5 and 5 that engage with the guide grooves 3 and 3' provided in the side plates 2 and 2', respectively. ' are provided corresponding to the number of guide grooves. 6, 6' are connected by a shaft 7, and the side plates 2, 2
The transmission gears 8 and 8' are rotatably supported by the transmission gears 6 and 6', respectively, and constitute gears that mesh with the transmission gears 6 and 6', respectively. In the drive arm, the main guide pins 5, 5' on the side wall members 4, 4 of the cassette holder 1 described above are engaged in guide grooves 9, 91 provided at the tips thereof, respectively. 1° is the drive motor fixed to the side plate 2, 11 is the worm 1
2, is connected to the output shaft of the drive motor 10 through a joint 13, and is rotatably supported by the side plate 2. 14 is a worm wheel that meshes with the worm 12, and 16 is a clutch disc, which 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/I/14 is rotatably fitted into the cylindrical portion of the clutch disc 15, and a small gear 17 is integrated into the cylindrical portion of the clutch disc 16 by sandwiching the worm wheel 14 therebetween. It is press-fitted and fixed. Further, this small gear 17 meshes with the transmission gear 6. Reference numeral 18 denotes a top plate that connects the side plates 2 and 2'. 19,2
0 is a switch element attached to the side plate 2 via the mounting bracket 21, and is used to detect the start and end of the rotation of the drive arm 8, but normally requires position adjustment. be.

10 and 11 are detailed diagrams of the configuration related to the clutch disk 15. FIG. That is, the clutch disc 16 is provided with half-moon-shaped elongated holes 23 and 23' that are arranged at a constant angle around the shaft hole 22 and at opposite positions, and the worm wheel/L/14 is provided with half-moon-shaped long holes 23 and 23'. Engaged in each are integrally formed protrusions 24, 24' at opposite positions relative to the center.

Normally, one end of the spring 16 is connected to the worm wheel/L'14, and the other end is connected to the clutch disc 1, so that the elongated holes 23, 23' and the protrusions 24, 24' are in a positional relationship as shown by the solid line.
6, respectively. Therefore, the difference between the opening angle α of the elongated hole 23 or 23' and the width α' of the protrusion 24 or 24', that is, α-47, is the difference between the worm wheel/L'14
and clutch disc 15 can rotate against each other against spring 16. 17' is a partially toothed gear integrally formed with the worm wheel (v14). The configuration shown in FIG. 10 is intended to improve operability and operational feeling for the user.

FIGS. 12 to 14 are explanatory diagrams of the operation of the above conventional example. In FIG. 12, when the cassette 25 is inserted and the switch is activated and the motor 1o starts rotating, or when the cassette 25 is inserted with the power turned off (OFF), the worm wheel 14 in the locked state is , so that only the transmission gear 6 meshing with the drive arm 8 engaged with the cassette holder 1 and the clutch disc 16 meshing with the transmission gear 6 rotate within the above-mentioned α-α' range. It is configured. Therefore, when the power is turned on,
The cassette holder 1 containing the cassette 26 is held by the spring 16.
When the switch circuit is activated and the drive motor 1o starts rotating, the worm wheel/V14 rotates via the worm 12, so that the protrusion 24 or 24' of the worm wheel 14 engages the clutch disc 1.
The end face of the elongated hole 23 or 23' on the hole 5 is pushed. Therefore, the small gear 1 integrated with the clutch disc 16
Drive arms 8 and 8' via a transmission gear meshing with 7.
is rotated, and the guide l+ configured in the drive arms 8 and 8'
The cassette holder 1 integrated with the guide pin 6.5' engaged with '/19+9' moves from horizontal movement to vertical movement along the L-shaped guide grooves 3, 3' of the side plates 2, 2'. and complete the cassette loading 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/L'14 is in a locked state and will receive strong resistance as a reaction force. Therefore, if you release your hand, the cassette holder 1
is returned to its original state.

Next, in FIG. 13, after the cassette is installed, the drive motor 10 rotates in the opposite direction when in ejection mode, but the correlation between the clutch decoupling 15 and the worm wheel (v14) is that the worm wheel (v14) is the clutch disc due to the spring 16. 16 will be pulled up. Therefore, normally, the load torque Ml when pulling up the cassette holder 1 containing the cassette 26 in the vertical direction is
Therefore, the set torque M2 of the spring 16 needs to be set to be larger than Ml. However, M2
If the value is increased, the reaction force generated when the user pushes in the cassette and the switch operates to cause the drive motor 1o to start rotating will increase, resulting in a poor operating feel, so an appropriate spring setting is required. Also, drive arms 8 and 8'
The movement area of the cassette holder 1 corresponding to the rotation angle α-α' is made to be within the horizontal movement section. In addition, if an overload is applied when lifting the cassette holder 1 vertically during the ejection operation, the cassette holder 1 below the drive arms 8, 8' becomes locked, and only the worm wheel 14 resists the spring 16 and the worm wheel 14 resists the torque generated by the spring 16. Clutch disc 15 and below begin to rotate only after the torque is balanced with the load torque or the clutch disc 15 and below have rotated by the above-mentioned α-47 range.

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 this conventional example, as shown in FIG. 14, the worm wheel 14 is integrally provided with a partially toothed gear 11 having the same diameter as the small gear 17 that is integrated with the clutch disc 16. meshes with the above α
The structure is such that meshing does not occur during horizontal movement over an area corresponding to a rotation angle of -α'. In addition, in 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 disk, but it is possible to ensure that the cassette holder returns to its home position upon completion of ejection, and that the cassette is When storing the cassette in the cassette holder, it is necessary that the holder does not move easily even if the cassette is not completely stored, and also when operating the magnetic recording/reproducing device at an angle on the assembly line or during repair service. Since the cassette holder containing the cassette needs to be reliably ejected, there is a limit to how much the setting torque of the spring 160 can be weakened.

Problems to be Solved by the Invention As described above, conventional cassette mounting devices are generally equipped with a dedicated expensive motor, and are also usually equipped with a full reduction gear device in order to maintain an appropriate rotational speed of the drive arm. This has the problem of high cost. Also, when inserting a cassette, if you continue to push the cassette by hand even after the cassette in switch is activated and the drive motor starts rotating, the worm wheel and clutch disc will rotate out of phase with each other compared to the state before the cassette was inserted. Unfortunately, the teeth on the worm wheel with missing teeth mesh with the gear on the drive arm while being out of phase with the gear on the clutch disc. Normally, the loading operation will not be completed in this state, or even if it is completed, the spring that engages the clutch decoupling and the worm wheel is stretched, so the problem is that the cassette will forcefully pop out due to the reaction force of the spring when it is ejected. was there.

In view of the above-mentioned problems, the present invention is based on the premise that the cab stan drive motor of the main body of the magnetic recording/reproducing apparatus is generally used, and the above-mentioned magnetic recording/reproducing apparatus eliminates the dedicated drive motor and reduction gear device. One end of the two-piece rank connected to each other by a first elastic member such as a tension spring can be engaged with the output gear provided on the main body, but the other end is not directly engaged with the drive arm. In addition, the other rack is configured to engage directly with the drive arm and rotate, so that even if the cassette H is continued to be pressed by hand even after the cassette-in operation has started, the teeth of one rack will not move when inserting the cassette. Since it is connected by the first elastic member without meshing with the drive arm, the first elastic member expands, so there is no phase shift between the racks, and the cassette holder is moved by the auxiliary force applying means during ejection. The purpose of the present invention is to provide a cassette mounting device that enables a smooth series of cassette mounting operations because a force that assists in the action of the cassette mounting device is applied, and at the same time, it has an extremely simple configuration and is inexpensive because it does not require a motor or a speed reduction system.

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 detachably holding a cassette tape, and a cassette holding member protruding from both side walls of the cassette holding member. The protrusion is movably inserted through the cassette holding member, and the cassette holding member is movable back and forth between a first position where the cassette tape can be attached and removed and a second position where the cassette tape can be recorded or played back. a first guide groove for guiding the cassette holding member to the first position; cassette holding member driving means having a rotatable driving arm for driving the protrusion from the second position to the second position and in the opposite direction; , a first member having teeth in a region for rotating the drive arm at a certain angle, a part having a convex portion such as a bend, and movable along a guide member provided on the side plate; The rack has an engaging part that engages with the convex part provided on the first rack, and moves along the guide member so that the first rack and the first elastic member can slide against each other. The protrusion protruding from the cassette holding member is attached to at least one of the side plate and the $2 rack having teeth at a position that is capable of meshing with the gear and does not mesh with the gear. 1. Applying an auxiliary force to the rotational force of the drive arm before the cassette holding member reaches the first position by applying a rotational biasing force in the rotational direction of the drive arm when moving to the first guide groove portion. It has a configuration that includes means.

Function The present invention enables a significant reduction in assembly man-hours and costs due to the extremely simple configuration described above, and also prevents problems caused by phase shift in the engagement between the drive arm and the rack when inserting the cassette, thereby ensuring reliable and smooth loading and unloading of the cassette. This provides an excellent cassette loading device that completes a series of operations.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings.

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

In Figure 1, 2θ is the cassette holder, 27°27
' is a side wall integrally formed on both sides of the cassette holder 26, 28, 28' is a guide pin provided on the side wall 27, 27', 29, 29' is a side plate arranged on both sides of the cassette holder 26, 30 , 30' are L-shaped guide grooves provided on the side plates 29 and 29', each consisting of two or three guide pins 28 and 28'.
are engaged with each other. Note that the number of guide pins 28, 28' corresponds to the number of guide grooves 30, 30'. 3
1.31' is connected by the shaft 32 and the side plate 29.2
The main guide pins 28 and 28' on the side wall member 27 and 28 of the cassette holder 26 are respectively engaged with the guide grooves 33 and 33' provided at the tip of the drive arm rotatably supported by the drive arm 9'. are combined. A shaft 32 and a gear are integrally formed on one side of the drive arm 31 or 31'. 3
Reference numeral 4 designates a first rack, which has a guide groove 34A formed to be horizontally movable by fitting into two guide pieces 35 and 35' provided on the side plate 29 or 29', and has a drive arm at one end thereof. 31 has several teeth 37 that mesh with an integral gear 36, and the other end has a side plate 29 or 29.
It constitutes a bent protrusion that engages with an actuator 39 of a slide switch 38 fixed to '. 40
is a second rack, which, like the first rack 34, has a guide groove 40A so that it can be horizontally moved by fitting into a guide piece 35, 36' provided on the side plate 29 or 29'. The rack 40 and the first rack 34 are connected to each other by a first elastic member 41 such as a tension spring engaged with a spring hook provided on each rack. Incidentally, the second rack 4o is formed with an engaging portion 42 having a rectangular elongated hole.
A convex portion 4 such as a bent portion formed on the first rack 34
3 are fitted and are normally brought into contact with each other by the tension spring 41, the phases of the guide grooves 34A and 40A fitted to the guide piece 36 formed on the side plate 29 or 29' match, and the Square engaging portion 4 of rack 40 of No. 2
2 and the convex portion 43 of the first rack 34, the first rack 34 and the second rack 4° are configured to be able to slide relative to each other.

Control levers 44 and 44' are rotatably provided on the side plate 29 or 29', and second elastic members 45 and 46' such as springs are coaxially provided.

46 and 46' are lever stoppers of the control levers 44 and 44', which are protruded from the side plates 29 and 29'.

One end of the second elastic member 45, 45' is connected to the side plate 29.
．． It is hung on a stopper 61° 61' protruding from 29', and the other end is hung on a control lever 44, 44'.

The control lever 44, 44' is connected to the second elastic member 45, 45
A rotation urging force is always applied in the direction of the lever stopper 46.46', and this control lever 44.44
' and the second elastic member 46°45' constitute an auxiliary force applying means.

Reference numeral 47 (see Fig. 3) is an output gear provided in the main body of the magnetic recording/reproducing device, and when the cassette mounting device according to the present invention is attached to this main body, the gears are adjusted in phase in advance.
It meshes with teeth 48 formed at one end of the L-shaped bend of the second rack 40. The teeth 48 of the second rack 40 are arranged over the same length as the area of the teeth formed on the first rack 34 at a position where they do not mesh with the gear 36 integral with the drive arm 31.

Magnetic recording and reproducing devices generally require various drive sources, such as a capstan drive, a tape loading mechanism drive, and a reel stand drive, but due to required performance, cost, etc., a dedicated motor may be used for each, or a single motor may be 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 latch mechanisms using mechanical or electric solenoids to switch the magnitude and direction of the output of the drive motor 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 the case of this example,
This shows a case where all operations except the cylinder are performed only by the capstan motor.

In FIG. 2, 49 is a direct drive capstan motor, 50 is a first reduction system, 61 is a second reduction system, 62 is a reel stand, 53 is a first clutch, and 54 has a kind of clutch function. a third deceleration system; 65 a fourth deceleration system; 66 an output system that performs a tape loading operation;
57 is a second clutch, 68 is a fifth reduction system, 59 is an output system of a system that controls the operation mode of each mechanism, 60 is a sixth reduction system, and 47 is connected to the cassette mounting device according to the present invention. It is an output gear. The first clutch 63 is used to switch between operations such as cassette mounting and tape loading and tape running operation, and is connected to the first reduction system 5.
Although not shown in the block diagram of FIG. 2, there is a mechanism between the capstan motor 0 and the second reduction system 51 that fully connects or disconnects the rotation of the capstan motor in conjunction with the mechanical operation mode control system. It is designed to connect when the tape is running.

Although various other configurations of the drive system described above are conceivable, in the case of the present invention, the main idea 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 7 are side views of essential parts for explaining the operation of the cassette loading device configured as described above.

Figure 3 shows the state before the cassette is inserted, and Figure 4 shows the state after the cassette is stored in the cassette holder, the cassette holder is further pushed in, the cassette in switch is activated, and the drive motor starts rotating. It is something.

That is, the second rack 4o that is meshed with the output gear 47 is in its original state, but the first rack 34 that is meshed with the gear 36 integrated with the drive arm 31 through its teeth 3 is in the first elastic member. horizontal movement against 41.

FIG. 6 shows a state in which the cassette in switch is activated to perform the cassette mounting operation. The output gear 47 rotates, and the output gear 4
The second rack 4o that engages with the second rack 4o moves horizontally in the direction of the arrow a, but since the engaging portion 42 pushes the convex portion 43 of the first rack 34, the drive that engages with the second rack 4o moves horizontally in the direction of the arrow a. 7-The arm 31 is rotated in the direction indicated by the arrow, and the cassette holder 26, which is engaged with the drive arm 31 through the guide pin 28, has an L-shaped guide groove formed in the side plate 29.29. 30. Perform horizontal and vertical movement along 30.

FIG. 6 shows that the guide pin 28 protruding from the side wall 27 of the cassette holder 26 is connected to the first guide groove portion 3 of the side plate 29.
It shows a state where the state is about to change from 0a to the second guide groove portion 3ob. At this time, the drive arm 31 and the control lever 44 are about to come into contact with each other. The guide bin 28 is connected to the second guide groove portion 30b.
When the drive arm 31 and the control lever 4
4 begin to come into contact with each other, and the second cassette in the device state of FIG.
It remains in that position. Here, since the control lever 44 is given a rotation urging force in the direction C opposite to the rotation direction of the drive arm 31 by the second elastic member 46, the control lever 44 reaches the second position of the cassette holder 26. Previous movement speed is reduced.

Here, normally, the guide pin 28 of the cassette holder 26,
28' is the first guide groove part 30a to the second guide groove part 30b
When moving to , the weight of the cassette holder 26 including the cassette that did not act while moving in the first guide groove portion 30a is
The drive arm 31 .is applied toward the second position of the cassette.
31' etc., the cassette holder 26 suddenly moved toward the second position of the cassette (it fell rather than moved), which caused a loud noise. According to the example:
The control lever 44, 44' is connected to the second elastic member 45, 46'.
As a result, a rotation urging force in the direction of arrow C) opposite to the rotation direction of the drive arm 31, 31' is applied, so that the moving speed of the cassette holder 26 before reaching the second position is reduced. Sudden falls do not occur and loud noises are significantly reduced.

Next, a description will be given of the time when the cassette is ejected.

When the drive motor starts rotating from the state shown in Figure 7,
The output gear 47 rotates, and the second rack 4o that meshes with the output gear 47 horizontally moves in the direction opposite to the arrow a. Second
The movement of the rack 40 is transmitted to the first rack 34 via the tension spring 41, and horizontally moves in the same direction as the second rack 4o.

The drive arm 31 that is engaged with the first rack 34 is rotated in the opposite direction as shown by the arrow, and the drive arm 31
The cassette holder 26, which is engaged with the guide pin 28, moves vertically and horizontally along the L-shaped guide grooves 3o and 3σ formed on the side plates 29 and 29', and is ejected to the state shown in FIG. Ru.

The force acting to move the cassette holder 26 in the first position direction is caused by the second elastic member 45 constituting the auxiliary force applying means, as is already clear from the description of the auxiliary force applying means for the operation at the time of inserting the cassette. The rotation biasing force generated by
1, acting as a force that causes the drive arm 31 to rotate in the opposite direction. Tsumashi, cassette holder 26
The force that acts to move the
This is done by the resultant force of the elastic forces of the elastic member 46 and the first elastic member 41.

The drive motor"-'11'6" capstan motor 49 is
It has enough force to reciprocate the cassette holder 26 containing the cassette between a first position where the tape cassette can be attached and removed and a second position where the cassette tape can be recorded or played back. When moving from the second position to the first position, the first elastic member 41 serves as a clutch mechanism, so that no more force than necessary is transmitted to the cassette holder 26. Therefore, when ejecting the cassette holder 26 using only the elastic force of the first elastic member 41, the elastic force exerts a considerable arm ratio on the gear portion 36 of the drive arm 31 and the guide pin 2 of the cassette holder 26. This results in a very large value, and when installing a cassette, the cassette holder 26 must be inserted horizontally with a large force against the first elastic member 41, making it impractical. Not. The smaller the elastic force of the first elastic member 41, the easier it is to use and the more practical it is.

However, if it is too small, the first elastic member 41 will not be able to generate a force to move the cassette holder 26, and it will only stretch. That is, the first rack 3
4 does not move, and only the second rack 40 moves in the opposite direction to the arrow a, and the cassette holder 26
cannot be moved.

In this embodiment, the elastic force of the first elastic member 41 is weakened to such an extent that it does not pose a problem when inserting the cassette and cut holder 26.
The cassette holder 26 can be moved by supplementing the elastic force of the first elastic member 41 with the elastic force of the second elastic member 46. In other words, as is clear from the relationship between the cassette holder movement distance and the force in FIG. The cassette holder 26 is held by the elastic member 41 of 1.
FB is the force acting as the cassette holder moving force on the cassette, and k is the load (force required to move the cassette holder 26) generated when moving the cassette holder 26 from the second position to the first position. FA during holder movement.

The elastic forces are set so that the force relationship between FB and FC is Fc × FA + FB. Therefore, cassette holder 2
6 can be moved to any position.

In this embodiment, the force HFA generated by the second elastic member
Although the section in which it acts is set near the middle between the first guide groove part and the second guide groove part, it is not limited to this and may be set in any section. For example, the first position action may continue to be applied over the entire range.

Furthermore, even if the cassette in switch is activated and the cassette loading operation starts when the cassette is inserted, the cassette cannot be inserted by hand.
- Figures 6 and 7 show the state in which pushing is continued.

In FIG. 6, a first rack 34 and a second rack 40
The second rack 4o moves with a relative deviation, but the second rack 4o is not provided with teeth that mesh with the gear 36 provided on the drive arm 31.

Therefore, there can be no phase shift between the second rack 40 and the gear 36, and as shown in FIG. 7, when the horizontal movement shifts to the vertical movement and the cassette mounting operation is completed, Since the first rack 34 and the second rack 4o are connected to each other by the first elastic member 41, they are returned to the phase matching state as before the cassette insertion.

Effects of the Invention As described above, according to the present invention, due to the extremely simple and inexpensive configuration, even when the cassette is inserted, even if the cassette tf is continued to be pressed by hand even after the cassette insertion operation has started, no phase shift occurs between the racks, and the auxiliary By using the force applying means, it is possible to smoothly and quietly insert and mount the cassette, and the ejecting operation can also be smoothly performed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration 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 device according to the embodiment, and FIGS. 3 and 4 , FIG. 6, FIG. 6, and FIG. 7 are side views of essential parts for explaining the operation of an embodiment of the present invention, FIG. 8 is a diagram showing the relationship between the cassette holder movement distance and each force, and FIG. FIGS. 10 and 11 are perspective views showing details of a conventional clutch disc structure,
FIGS. 12, 13, and 14 are side views of essential parts for explaining the operation of a conventional cassette loading device. 26...Cassette holder, 28.28'...
...Guide bin, 29.29'...Side plate, 30.30'...L-shaped guide groove, 31,
31'... Drive arm, 34... First
Rack, 40...Second rack, 41...
...First elastic member, 44.44'... Control lever, 45.45'... Second elastic member, 4
7... Output gear. Name of agent: Patent attorney Shigetaka Awano and 1 other person47
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Claims (3)

[Claims] (1) A cassette holder capable of removably holding a cassette tape, into which protrusions protruding from both side walls of the cassette holder are movably inserted, and the cassette holder is capable of attaching and detaching the cassette tape. a first position;
a first guide groove portion that guides the cassette tape so that it can be moved back and forth between a second position where recording or playback is possible;
a double side plate having a second guide groove continuously formed in a direction perpendicular or substantially perpendicular to one end of the first guide groove; a direction for moving the cassette holder from the first position to the second position; a drive means having a rotatable drive arm for driving the protrusion in the opposite direction; and a drive means having a rotatable drive arm for driving the protrusion in the opposite direction; a first rack that includes teeth and has a convex portion formed in a part thereof and is movable along a guide member provided on the side plate; and a lock that engages with the convex portion provided on the first rack. a first rack having a mating portion, movable along the guide member so that the first rack and the first elastic member can slide relative to each other, and having teeth configured at positions that do not mesh with the gear; When the protrusion protruding from the cassette holder moves from the second guide groove to the first guide groove, the protrusion is formed on at least one of the rack No. 2 and the side plate, and rotates in the rotation direction of the drive arm when the protrusion protrudes from the cassette holder. A cassette mounting device comprising: auxiliary force applying means for applying a moving force to assist the rotational force of the drive arm before the cassette holding member reaches the first position. (2) The auxiliary force applying means applies a force F_A that acts on the cassette holder as a cassette holder moving force, and a force that acts as a cassette holder moving force on the cassette holder via the drive arm by the elastic force of the first elastic member. F_B, and when the load generated when moving the cassette holder including the cassette is F_C, at least when moving the cassette holder from the second position to the first position, the first 2. The cassette mounting device according to claim 1, wherein the elastic force of the elastic member and the force applied by the auxiliary applying means are set appropriately. (3) The auxiliary force applying means includes a control lever rotatably provided on at least one side wall member, and a second elastic member that applies a rotational force in one direction to the control lever, and the drive arm before reaching the end of rotation for bringing the cassette holder to the second position, a portion of the drive arm contacts a portion of the control lever, causing the control lever to rotate of the second elastic member. 3. The cassette mounting device according to claim 1, wherein the cassette mounting device is configured to rotate against an urging force.