JPS6350969A - Cassette loader - Google Patents

Abstract

PURPOSE:To improve the operation sensibility at a cassette pushing-in time by connecting the engageable rack of two sheets composition to the output gear provided on a magnetic recording and reproducing device main body by a high initial tension tensile spring each other and driving it with its engagement to a driving arm directly. CONSTITUTION:A 1st rack 34 has a horizontally movable guide groove by engaging with two guide pieces 35, 35' provided on side face plates 29, 29' and also has the several teeth 37 engaging with the gear 36 integral to a driving arm 31 at its one end, yet has the bending projection fitted to the actuator 39 of the sliding switch 38 which is fixed to plates 29, 29' at the other end. A 2nd rack 40 has a horizontally movable guide groove by engaging with the guide pieces 35, 35' provided on the plates 29, 29' same as the rack 34 and the racks 40 and 34 are linked each other by a high initial tension tensile spring 41. One end of the rack 40 has several teeth 42 of less tooth number and there is the tooth 43 in the same length as that of the tooth of the rack 34 at the position not engaging with the gear 36 integral to the driving arm 31 on the other end.

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 devices such as video tape recorders (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. 8 shows the configuration of a conventional cassette loading device.

In Fig. 8, 1 is a cassette holder for storing cassettes, 2 and 2' are side plates arranged on both sides of the cassette holder 1, and 3 and 3' are side plates) 2 and 2' are L-shaped side plates. These are usually two or three guide grooves. Reference numerals 4 and 4' denote side wall members integrally formed on both sides of the cassette holder 1, each of which has a guide pin 5.5' that engages with the guide groove 3, 3' provided in the aforementioned side plate 2.2'. They are provided in correspondence with the number of guide grooves. 6.6' is connected by shaft 7, side play) 2.2'
The transmission gears 8 and 8' are rotatably supported by the transmission gears 6 and 6', respectively, and the transmission gears 8 and 8' constitute gears that mesh with the transmission gears 6 and 6', respectively. The main guide pins 6.5' on the side wall members 4, 4' of the above-mentioned cassette holder 1 are respectively engaged in guide grooves 9, 9' provided at the ends of the arms.

1o is a drive motor fixed to the side plate 2, 11
is a shaft formed integrally with the worm 12, connected to the output shaft of the drive motor 1o through a joint 13, and rotatably supported by the side plate 2. 14 is warm 1
The worm wheel 14 meshes with the screw coil spring 16 at the clutch disc 16.
5, which is rotatably connected to the side plate 2, and is rotatably supported by a shaft integrally formed with the side plate 2.
There are pages. The worm wheel 14 is rotatably fitted into the cylindrical portion of the clutch disc 16, and the small gear 17 is press-fitted into the cylindrical portion of the clutch disc 15 so as to be integrated with the worm wheel 14. 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'.

19.20 is a switch element attached to the side plate 2 via the mounting bracket 21, which detects the start and end of the rotation stroke of the drive arm 8, but normally requires position adjustment. It's normal. , Figures 9 and 10
The figure is a detailed diagram of the configuration related to the clutch disc 15.

That is, the clutch disc 15 is provided with a half-moon-shaped elongated hole 23° 23' formed at a certain angle in a position parallel to and opposite to the shaft hole 22, and the worm wheel 14 is inserted into this hole.
are engaged with projections 24 and 24' integrally formed at positions opposite to the center thereof. Normally, one end of the spring 16 is connected to the worm wheel 14 and the other end is connected to the clutch disc 1 so that the elongated hole 23, 23' and the protrusion 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 angle d of the protrusion 24 or 24', that is, α - α7, is the difference between the worm wheel 14
and clutch disc 15 can rotate against each other against spring 16. The configuration shown in the detailed diagram of Fig. 2 is as follows:
This is to improve the operability and feeling of operation for the user. 11 to 13 are explanatory diagrams of the operation of the above conventional example.

In FIG. 11, when the cassette 25 is inserted and the switch is activated and the motor 1o starts rotating, or when the cassette 26 is inserted with the power turned off (OFF), the worm wheel 14 in the locked state , so that only the transmission gear 6 meshing with the drive arm 8 engaged with the cassette holder 1 and the clutch disc 15 meshing with the transmission gear 6 rotate within the range α-l. There is.

Therefore, when the power is turned on, when the cassette holder 1 containing the cassette 25 is slightly pushed in against the spring 16, the switch circuit is activated, and the drive motor 7 and the drive motor 10 begin to rotate. Since the worm wheel 14 rotates, the protrusion 24 of the worm wheel 14 or the protrusion 24 touches 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 15
Drive arms 8 and 8 via a transmission gear 6 meshing with 7.
' rotates, and the cassette holder 1, which is integrated with the guide pins 5, 5' engaged in the guide grooves 9 and 9' formed in the drive arms 8 and 8', moves into the L-shaped guide groove 3 of the side plate. ,3'
The cassette mounting operation is completed by moving from a horizontal movement to a vertical movement along the .

Further, when the power is off, the cassette holder 1 containing the cassette 25 can be pushed against the spring 16 only by an area corresponding to the rotation angle α-α'. Beyond that, the worm wheel is locked and will experience strong resistance as a reaction force. Furthermore, when the user releases his/her hand, the force of the spring 16 returns the cassette holder 1 to its original state.

Next, in FIG. 12, after the cassette is installed, the drive motor 10 rotates in the opposite direction when in ejection mode, but the relationship between the clutch disc 15 and the worm wheel 14 is determined by the spring 1.
6, the Shiraohm wheel 14 is connected to the clutch disc 15
This will cause the tension to rise. Therefore, normally the cassette 26
When the cassette holder 1 containing the cassette holder 1 is pulled up in the vertical direction, a load torque M1 is applied to the clutch disc 16, so the set torque M2 of the spring 16 needs to be set to be larger than M1. However, if M2 is increased, the reaction force generated when the user pushes in the cassette and the switch operates to cause the drive motor 10 to start rotating will increase, resulting in a poor operating feel, so appropriate spring settings are required. be.

Further, the movement range of the cassette holder 1 corresponding to the rotation angle α-α' of the driving arms 8 and 8' is set within a horizontal movement range. Also, 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' will be in a locked state, and the worm wheel will move against the spring 16. 14
Only if the torque generated by the spring 16 matches the load torque or the above α-α
Clutch discs 15 and below finally begin to rotate after rotating for only 7 minutes. 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 the conventional example, as shown in FIG.
A partially toothed gear 17' having the same diameter as 7 is provided and meshes with the transmission gear 6 only during vertical operation, and during horizontal operation over a range corresponding to the rotation angle of α-α'. It is structured in such a way that there is no In addition, in the case of such a configuration, the spring 16
Cent torque M2 does not necessarily need to be larger than the load torque M1 applied to the clutch disc, but it is important to ensure that the cassette holder returns to its normal position when ejection is complete, and that the cassette is completely stored in the cassette holder. It is necessary that the cassette holder does not move easily when the 10-page cassette is stored, and that the cassette holder containing the 10-page cassette must be securely in place when the magnetic recording/reproducing device is tilted and operated on the assembly line or during repair service. Since it is necessary to discharge the water, there is a limit to weakening the set torque of the spring 16.

Problems to be Solved by the Invention As mentioned in the above conventional examples, conventional cassette loading devices are generally equipped with a dedicated and expensive drive motor, and are further equipped with a reduction gear to maintain the appropriate rotation speed of the drive arm. It is common to be equipped with equipment, etc., which has the problem of high cost. In addition, in order to improve operability and operational feel, it is equipped with a type of clutch mechanism using a threaded coil spring, but it affects the operational feeling when pushing the cassette, and the spring force that acts as a reaction force is limited to a certain limit. I couldn't do less. In addition, since the start/end detection switch for a series of cassette loading and ejecting operations is operated by the rotational operation of an actuator integrated in the drive arm, there are generally two
However, this requires delicate positional adjustment on the assembly line, which poses a problem in that it leads to modification and storage.

Page 11 In view of the above-mentioned problems, the present invention is based on the premise that the capstan drive motor of the main body of the magnetic recording/reproducing device is generally used, and eliminates the need for a dedicated drive motor and reduction gear device. A two-piece rack that can mesh with the output gear provided on the device body is connected to each other by a high initial tension tension spring, and is driven by directly meshing with the drive arm. This device is equipped with a switch element of 1, which is extremely simple and inexpensive, and eliminates the work of adjusting the position of the switch, and by using a high initial tension tension spring, the spring constant can be reduced. Therefore, it is an object of the present invention to provide a cassette loading device that can improve the operational feeling when pushing in a cassette.

Means for Solving the Problems In order to solve the above-mentioned problems, the cassette mounting device of the present invention includes a cassette mounting device that includes a cassette holder that stores a cassette, and a side plate disposed on both sides of the cassette holder. The drive arm is directly rotated by a two-piece rack equipped with a rack.The first rack meshes with a gear formed on the drive arm, and the second rack rotates the drive arm only in the vertical movement section of the cassette loading operation. It has several teeth that mesh with the gear of the arm, and also has teeth in positions that do not mesh with the gear of the drive arm, and can mesh with the output gear of the drive system provided in the main body of the magnetic recording and reproducing device. The first rack and the second rack are slidably connected to each other by a high initial tension tension spring that can set a high initial tension, and are engaged with the first rack. The actuator, which automatically determines its position, slides in conjunction with the horizontal movement of the rack, and consists of a single slide switch configured to have contacts at both ends of the rack stroke.

Function: The present invention provides an excellent means for significantly reducing assembly man-hours and costs through the extremely simple configuration described above, and improving the user's operational feeling.

Embodiment 13 From the following pages, embodiments 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 Fig. 1, 26 is a cassette holder, 27.27
' is a side wall integrally constructed on both sides of the cassette holder 26, 28.28' is an indoor 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' is a lateral play)29
．． L-shaped guide grooves provided at 29', each consisting of two or three guide grooves, are engaged with guide pins 28 and 28', respectively. Note that the number of guide pins 28, 28' corresponds to the number of guide grooves 30, 30'. 31.3
1' is connected by the shaft 32, side play) 29.29
The drive arm is rotatably supported by the cassette holder 26 in the guide groove 33.
main guide pin 28.2 on side wall member 27.27' of
8' are respectively engaged. Drive arm 31 or 3
A gear is integrally formed on one side of the shaft 32 and coaxial with the shaft 32, and has 14 heges. Reference numeral 34 denotes a first rack, which has a guide groove formed to be able to move horizontally 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. A slide switch 3 has several teeth 37 meshing with a gear 36 integral with the slide switch 31 and is fixed to the side plate 29 or 29' at the other end.
It constitutes a bent-shaped protrusion that engages with the actuator 39 of No. 8.

40 is a second rack, which, like the first rack 34, has a guide groove so that it can be horizontally moved by fitting into a guide piece 35° 35' provided on the side plate 29 or 29'. The rack 4o and the first rack 34 are connected to each other by a high initial tension tension spring 41 that engages with a spring hook provided respectively. Also, one end of the second rack 40 is in phase with the teeth provided on the first rack 34, but it has several teeth 42 with a small number of teeth and is bent into an L-shape. The other end has 15 teeth 43 extending over the same length as the area of teeth formed on the first rack 34 at a position that does not mesh with the gear 36 integral with the drive arm 31. Reference numeral 44 denotes 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 the main body, the output gear is meshed with the teeth 43 of the second rack 40 with the phases aligned in advance. It is something. Furthermore, the second
A square elongated hole 45 is formed in the rack 4o, into which a bending member 46 formed in the first rack 34 is fitted, and the two are normally brought into contact with each other by a tension spring 41. At this position, the phases of the guide grooves that fit into the guide pieces 35 and 35' formed on the side plate 29 or 29' match, and the square hole 45 of the second rack 4o and the bent member of the first rack 34 are aligned. 46, the first rack 34 and the second rack 4o are configured to be able to slide relative to each other.

Magnetic recording and reproducing devices generally require various drive sources such as a capsun drive, tape loader/mechanical drive, and reel stand drive, but due to the required performance, cost, etc.
Various configurations have been put into practical use, such as using a single motor to perform 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, 47 is a direct drive capstan motor, 48 is a first reduction system, 49 is a second reduction system, 5o is a reel stand, 51 is a first clutch, and 52 has a kind of clutch function. a third speed reduction system; 53 is a fourth speed reduction system; 54 is an output system that performs a tape loading operation;
65 is a second clutch, 56 is a fifth reduction system, 57 is an output system of a system that controls the operation mode of each mechanism, 58 is a sixth reduction system, and 44 is connected to the cassette mounting device of the present invention. This is the output gear. The first clutch 61 is a 17-page clutch that switches between operations such as cassette mounting and tape loading and tape running operations, and there is a block diagram between the first and second reduction systems. Although not shown, there is a mechanism that connects or cuts off the rotation of the capstan motor in conjunction with the mechanical operation mode control system, and is connected 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 6 are explanatory diagrams of the operation of the cassette loading device configured as described above.

FIG. 3 shows the state before the cassette is inserted. Here, the slide switch 38 engaged with the first rack 34 automatically determines the position of the actuator 39 and does not require adjustment.

FIG. 4 shows the state up to page 18, where 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.

That is, the second rack 40 meshing with the output gear 44 is in its original state, but the first rack 34 meshing with the gear 36 integral with the drive arm 31 is horizontal against the tension spring 41. Moving. Therefore, the reaction force of the tension spring 41 acts on the user, but since the high initial tension tension spring of this embodiment can have a small spring constant, it is relatively strong compared to the threaded coil spring type seen in the conventional example. You can get a soft feeling of operation.

Furthermore, if the cassette holder 26 containing a cassette is pushed in with the power off, the space corresponding to the square hole 46 of the second rack 40 and the bending member 46 of the first rack 34 corresponds to the space area of the cassette holder. Although it is possible to push in a certain distance below the horizontal motion range, the reaction force by the spring 41 can also be set smaller in this case than in the conventional example.

FIG. 5 shows a state in which the cassette in switch is activated to perform the cassette mounting operation. The output gear 44 rotates, and the second rack 4o that meshes with the output gear moves horizontally in the direction of arrow mark a on page 19, but the wall of the square hole 45 pushes the bending member 46 of the first rack 34. Therefore, the drive arm 31 that is engaged with the second rack 40 is rotated in the direction of the arrow, and the drive arm 31 and the guide pin 28
The cassette holder 26 engaged in the side play) 2
Horizontal and vertical movement is performed along the L-shaped guide groove 30.30' configured at 9.29'.

FIG. 6 shows a state in which the cassette has been completely installed in a predetermined position. At this point, the teeth 4 configured at one end of the second rack 40 are in phase with the teeth 37 provided on the first rack 34.
2 meshes with a gear 36 integral with the drive arm 31.

In the ejection operation of the cassette, each of the above-mentioned components moves in the opposite direction to the loading operation, but in the vertical movement section, the teeth 42 on the second rack 40 move in the same direction as the teeth on the first rack 34. Similarly, it is set to mesh with the gear 36 of the drive arm 31. However, in the horizontal movement area of the cassette holder 26 corresponding to the space area between the square hole 45 of the second rack 40 and the bent portion 46 of the first rack 34, the teeth 42 on the second rack 4o are not driven. It is necessary to set it so that it does not mesh with the gear 36 of the arm 31. 7th
The figure is an explanatory diagram of a high initial tension tension spring. Point A indicates the set spring force.

Of course, the configurations required for a series of operations, such as the mechanism for unlocking and opening the guard lid of the cassette and the mechanism for pressing the cassette when the cassette installation is completed, are the same as those of the prior art, so their explanation will be omitted.

As described above, according to this embodiment, there is provided a second rack which is provided in a magnetic recording/reproducing device and is capable of horizontal movement by meshing with an output gear that transmits the output of a drive motor for the device, and a tension spring attached to the second rack. By configuring a drive arm equipped with a gear that meshes with teeth provided on a first rack that is interconnected with each other, a series of operations for loading and ejecting a cassette can be performed without a dedicated motor. In addition to providing a simple and inexpensive cassette mounting device, the clutch mechanism uses a tension spring with high initial tension to improve the user's operating feeling. By using a slide switch equipped with a slide switch, there is no need to adjust the position of the actuator as in the conventional case.

Effects of the Invention As described above, the present invention has an extremely simple and inexpensive configuration that does not require a dedicated motor or speed reduction system, making it possible to significantly reduce costs, and to reduce the number of man-hours and man-hours required for adjusting the position of the switch. No process is required, and an extremely excellent effect can be obtained in which the user's operational feeling can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a cassette mounting device according to an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a drive system of a magnetic recording/reproducing device according to the present embodiment, and FIGS. 3 to 6 are the same. A schematic side view for explaining the operation of this embodiment, FIG. 7 is a characteristic diagram of a high initial tension tension spring, FIG. 8 is a perspective view of a conventional cassette mounting device, and FIGS. 9 and 10 are conventional examples. FIGS. 11 to 13 are schematic side views of essential parts for explaining the operation of a conventional 22-page set loading device. 26...Cassette holder, 28, 28' river...
・Guide pin, 29.29'...Side plate, 3
1゜31'...Drive arm, 34...First rack, 38...Slide switch, 4o
...Second rack, 41...High initial tension tension spring, 44...Output gear. Name of agent: Patent attorney Toshio Nakao and 1 other person 44
゛-Output needle wheel 2 Figure 49-2 11-year-olds 5O---Sole St-11-in 1. Kura, 7+ 52-year-old 3 Tsukasa Yu (1 53-11 year-old 4^ Gi 54--゛chi 7° Rodein Gebo sword type S5--+2
6---'15;a A, screwdriver Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure □ Duff Figure 9 Special release! 'IHG3-50969(9) δ(8) Procedural Amendment July 21, 1988

Claims (4)

[Claims] (1) A cassette holding member for storing cassette tapes having a plurality of protrusions formed on side walls provided on both sides, and a plurality of L-shaped guides disposed on both sides of the cassette holding member and engaging with the protrusions. a side plate having a groove; a shaft rotatably supported by the side plate, and having arms fixed on both sides thereof each engaging one of the protrusions and having a slidable guide groove; A gear is integrally formed on one side of the arm concentrically with the shaft, teeth are formed in a region that engages with the gear and rotates the arm at least by a certain angle, and a part is bent. a first rack that is horizontally movable along a guide member provided on one side of the side plate; and a rectangular elongated hole that is engaged with the bent portion provided in the first rack. , and is connected to the first rack by a tension spring so as to be movable along the guide member so as to be able to slide relative to each other, and configured in the first rack at a position that does not mesh with the gear integral with the arm. A cassette loading device comprising a second rack having teeth extending over approximately the same length as the area of the teeth. (2) A patent claim characterized in that one end of the second rack is provided with several teeth that are in phase with the teeth formed on the first rack and have a smaller number of teeth than the teeth formed on the first rack. The cassette mounting device according to scope 1. (3) The cassette installation according to claim 1 or 2, characterized in that the tension spring that engages and connects the first rack and the second rack is constituted by a high initial tension tension spring. Device. (4) A slide switch that has an actuator that engages with and interlocks with a protrusion provided on the first rack, and that has a built-in contact that can detect the start and end positions of the operating stroke of the first rack. The cassette mounting device according to claim 1 or 2, characterized in that the cassette mounting device is provided on a side plate.