JPS6156573B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording/reproducing device such as a video tape recorder, and more particularly to a control device capable of driving magnetic tape withdrawal and pinch roller compression in a series of operations. It is.

[Background of the invention]

Conventionally, in this type of device, a dedicated motor is installed in the tape pulling means, an electromagnet is used as the pinch roller crimping power source, and after the tape has been pulled out to a predetermined position, a switch is activated to stop the motor rotation. There was one that activated an electromagnet to press the pinch roller against the capstan. However, this method requires many expensive electromagnetic parts such as motors and electromagnets, and since electricity is consumed by energizing the electromagnets when the tape is running, it is not suitable for battery-powered portable types.Furthermore, it is not suitable for battery-powered portable types, and it also causes noise etc. There were drawbacks such as the electromagnet's control circuit malfunctioning, causing the pinch roller to operate before the tape was pulled out to a predetermined position, which could infrequently cause damage to the tape.

[Purpose of the invention]

An object of the present invention is to solve the problems of magnetic recording and reproducing devices as described above, and to provide a control device that is inexpensive, saves power, and has improved reliability.

[Summary of the invention]

The present invention uses forward and reversible motor power that drives a magnetic tape pull-out means to drive the pinch roller crimping, and controls a device that transmits the motor rotation to these drive mechanisms to stop the rotation of the motor. It also has functionality.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic recording and reproducing apparatus of the present invention will be described below based on embodiments shown in the drawings.

FIG. 1 is a plan view of the magnetic recording/reproducing apparatus of the present invention. In FIG. 1, reference numeral 1 denotes a base, and reel stands 9a and 10a are set up on the base base 1, and a take-up reel stand 9 and a supply reel stand 10 are rotatably mounted, respectively. The guide base 11 is mounted parallel to the base base 1 by supports on the base base 1, and tape guide pins 13, 14, erasing head 15, and roller 1 are mounted on the guide base 11.
6, 17, audio control head 18,
A tape guide pin 19 is attached. The capstan 21 is fixed to a flywheel 43 (see FIG. 2), and the pinch roller 22 is rotatably supported on a pinch roller arm 23 rotatably attached to a shaft 23a on the base 1. There is. Flywheel 43 is connected to capstan motor 100 via a belt. 24,
Reference numeral 24' denotes a guide mounting base member (see also FIG. 6), on which correction posts 26, 26' and cylindrical guide bodies 27, 27', which are guides for guiding and regulating the magnetic tape 42, are attached, and the magnetic tape inside the cassette 54 is The tape 42 is wound around the rotary head cylinder 12 provided at an angle with respect to the drawer base 1. still,
In this case, its movement is guided by arcuate grooves 11a and 11b formed in the guide base 11, and its position is regulated by locking members 41 and 41' during recording and reproduction. The correction posts 26, 26' are cylindrical guide bodies 27, 2, respectively.
Guide mounting base 25, 2 that can rotate around 7'
5' (see Figures 2, 4, and 6). 78 is an arm with a tape guide pin 74 planted at one end, and a shaft 7 on the base 1.
It is designed to be rotatable at 8a and interlocked during recording and reproduction, and a tension spring 75 is installed between the bases 1.
One end of a band member 76, which is attached via a pin 78b and wound around the supply reel stand 10 in a substantially semicircular manner, is rotatably supported by a pin 78b. Note that the other end of the band member 76 is fixed to the basic base 1 with a screw 77.

Fig. 2 is a plan view of the magnetic recording/reproducing device shown in Fig. 1 with approximately half of the button mounting side removed and a portion of the guide base cut away, and Fig. 3 is a left side view of the main parts thereof. .

In FIGS. 2 and 3, reference numeral 29 indicates a motor for a tape drawing system (for loading and unloading), which is fixed to the base 1, and a motor pulley 30 is fixed to the motor shaft 29a. A shaft 31a of a pulley 31 driven by a motor pulley 30 via a belt 32 is supported by the base 1, and a worm 33 is further fixed integrally therewith. On the other hand, on the base 1, there is a worm gear 34 that is engaged with the worm 33 and rotates in opposite directions.
34' are supported by shafts 34b and 34'b, respectively, and pins 34a and 34'a are installed in the respective worm gears 34 and 34'. 36,
37, 38 and 36', 37', 38' are link members rotatably connected by two pins 37'a, 38'a (the link members 36, 37, 38 side are not shown), respectively. Also, the link members 36, 3
Pins 36a, 36'a planted on 6' and pins 34a, 3 planted on worm gears 34, 34'
4'a are connected by springs 35, 35', and arc-shaped guide grooves (not shown) are formed inside the worm gears 34, 34'.
5, 35' and pins 36a, 36'a are accommodated and guided. In addition, pin 37'a, 3
Pin and link members 38, 3 on the side opposite to 8'a
The protruding portions of the pins 39, 39' (see FIG. 6), which are installed at the other end of the pins 8', toward the base 1 are almost guided onto the base 1 as shown in FIGS. 2 and 6. U-shaped groove 40 of guide members 40, 40' formed along arcuate grooves 11a, 11b of base 11
a, 40'a, and the locus of movement is regulated. Furthermore, the guide base 1 for pins 39, 39'
The protrusions toward the first side are connected to protrusions 24b, 24'b of guide mount members 24, 24' on the guide base 11.

Next, the drive means for pinch roller pressure bonding will be explained with reference to FIG. The loading arm 44 is rotatably attached to a shaft 44a on the base 1, and one end is rotatably attached to the arm 45 by a pin 46. The arm 45 has a connecting pin 49 in the center.
is rotatably connected to each end of the arms 47 and 48, and the other end is connected to the end of a bracket 52 on the base 1 via a tension spring 53. On the other hand, each other end of the arms 47, 48 has a pin 47a,
48a is planted, the pin 47a is engaged with a hole provided in the pinch roller arm 23, and the pin 48a is provided at one end of an arm 50 rotatably attached to a shaft 50a on the base 1. is engaged with the hole. Further, a tension spring 51 is connected between the other end of the arm 50 and the bracket 52 on the base 1.
is stretched and the bent portion 50b of the arm 50
is located in a hole 1a provided in the base 1, and its position is regulated. The arm 70 shown in FIG.
It is rotatably mounted on a shaft 70a, and a pin 23b on the pinch roller arm 23 is engaged with an elongated hole provided at one end. On the other hand, a take-up roller 71 is driven by being pressed against the take-up reel stand 9 by a spring 72, and is supported pivotally on an arm (not shown) provided with pins 71a and 71b. pin 7
The pin 1b restricts the movement of the arm along a guide groove provided on the base 1, and the pin 71a extends to a height where it comes into contact with the arm 70.

Further, 2 is a pause button, 3 is a stop button, 4 is a fast forward button, 5 is a playback button, 6 is a rewind button, 7 is a record button, and 8 is an after-recording button. Reference numeral 59 denotes a slider, which is attached to be slidable left and right on the base 1 in conjunction with the operation of the playback button 5 and the record button 7, and the other end is an arm rotatably attached to a shaft 60a on the base 1. 60 is engaged. A pin 60b erected at the other end of the arm 60 is engaged with an arm 61 rotatably attached to a shaft 61a fixed on the base 1. In FIG. 2, the slider 62 is connected to the guide holes 62a, 62b and the base 1.
It is slidably attached while being guided by the upper guide pin, and the elongated hole 62d engages with a pin 61b set on the arm 61. Also, slider 6
A tension spring 58 is stretched between the base 1 and the base 1. The switch board 63 is fixed on the base 1 with a bracket 66, and the switches 64, 65
is installed. The switches 64 and 65 are provided on the circuit connecting the motor 29 and the power source.
When the switch 64 is closed, the motor 29 is configured to rotate counterclockwise in FIG. 3, and when the switch 65 is closed, the motor 29 is configured to rotate clockwise.

In FIGS. 8 to 11, the switch levers 67, 67' are rotatably attached to a shaft 73 on the basic base 1, and are formed in the same shape.
actuators 64a, 65 of switches 64, 65, respectively.
The switch levers 67 and 67' have a tension spring 68 stretched between them, and the tapered parts 67a and 67'a are in contact with the rising parts 62c and 62e of the slider 62, respectively. It is composed of Further, the arm 69 is rotatably attached to the base 1 on a shaft 69a. On the other hand, pins 34c and 34'c are installed in the worm gears 34 and 34', respectively.
The pin 34'c is connected to the straight part 4 of the loading arm 44.
4b and the tapered portion 69b of the arm 69, respectively, in a height relationship that allows contact. Further, the pin 34c is at a height such that it can come into contact with the bent portions 11c and 11d of the guide base 11.

Next, the operation of the above device will be explained.

<Stop mode → Playback (record) mode> When the playback button 5 or the record button 7 is pressed in the stopped state shown in FIG. 1, the slider 59 moves to the right on the base 1 in FIG. arm 60
is driven counterclockwise around axis 60a. Along with this, the arm 61 is driven via the pin 60b and rotated clockwise around the pin 61a, and in FIG. . At this time the 8th
As shown in the figure, the rising portion 62c of the slider 62
The switch lever 67' pushes the taper part 67'a of the switch lever 67' and rotates the switch lever 67' clockwise around the shaft 73, and at the same time, the switch lever 67 moves the taper part 67a to the slider 62 by the biasing force of the tension spring 68. The shaft 73 is in contact with the rising portion 62e of the
can be rotated clockwise around the Therefore, the switch lever 67 pushes the actuator 64a of the switch 64, turning on the switch 64, and as shown in FIG. 3, the motor 29 is energized and starts rotating counterclockwise. At this time, play button 5
Alternatively, the record button 7 is kept pressed by a button lock mechanism (not shown).

As the motor 29 rotates, the pulley 31 is rotated by the belt 32 together with the shaft 31a, so the coaxial worm 33 rotates, the worm gear 34 rotates clockwise around the shaft 34b, and the worm gear 34' rotates clockwise around the shaft 34b. Start rotating counterclockwise around ′. Therefore, the link members 36, 37, 38 and 36', 37', 38' are attracted via the springs 35, 35', and the terminal pins 39, 39' are attracted to the guide member 40 formed on the basic base 1. , 40' along the U-shaped grooves 40a, 40'a.

On the other hand, as shown in FIG. 6, guide mounting base members 24, 24' placed on the guide base 11
Since the protrusions 24b, 24b' are engaged with the pins 39, 39', the correction posts 26, 26 placed on the guide mounting base members 24, 24' move as the pins 39, 39' move. ' and cylindrical guide body 2
7, 27' from the position shown in FIG.
The magnetic tape 42 in the guide base 11 is pulled out from two locations and begins to move along the grooves 11a and 11b formed in the guide base 11.

Furthermore, by operating the play button 5 or the record button 7, the arm 78 can be rotated counterclockwise around the shaft 78a by the tension spring 75, and furthermore, the guide mounting base members 24, 24' can be moved. The magnetic tape 4 is rotated to the position shown in FIG.
2 and the supply side reel stand 10.
The belt-shaped member 76 provides the necessary braking force during recording and reproduction. As the above operation progresses, the state shown in FIG. 5 is reached, and the guide mounting base members 24, 24' come into contact with the locking members 41, 41', and their positions are regulated. At this time, link member 3
6, 37, 38 and 36', 37', 38' are wound into an annular shape by worm gears 34, 34'. Further, the magnetic tape 42 is connected to the tape guide pin 1
3, 74, and 14, contacting the erasing head 15 and the roller 16, a cylindrical guide body 27, and a correction post 26.
It is then wound around the rotary head cylinder 12 at a predetermined angle, and further includes a correction post 26' and a cylindrical guide
It contacts the roller 17 and the audio control head 18 via the tape 7', and reaches the inside of the cassette 54 via the tape guide pin 19 and the capstan 21.
With the above steps, the tape unloading operation (loading) is completed.

Further, as the rotation of the motor 29 progresses, the springs 35, 35' in the worm gears 34, 34' begin to deform as the guide mounting base members 24, 24' are stopped by the locking members 41, 41', and this force causes the springs 35, 35' to deform. The guide mount members 24, 24' begin to press against the locking members 41, 41'. At this time, as shown in FIG. 9, the pin 34'c installed on the worm gear 34' begins to contact the straight part 44b of the loading arm 44, and after contacting the loading arm 44, it rotates clockwise around the shaft 44a. make it move. Therefore, the arm 45 is pulled against the biasing force of the tension spring 53, and the arm 45 is pulled against the biasing force of the tension spring 53.
The pin roller arm 23 rotates counterclockwise about the shaft 23a so that the angle at which the pins 7 and 48 intersect approaches approximately 180 degrees, and the pinch roller 22 eventually comes into contact with the capstan 21. That is, magnetic tape 4
2, the pinch roller 22 is pressed against the capstan 21 (see FIG. 13).

When the rotation of the worm gear 34' further progresses from this state and the rotation of the arm 45 progresses, the arm 50 rotates clockwise about the shaft 50a and the tension spring 51
is slightly stretched, the pinch roller 22 presses the magnetic tape 42 against the capstan roller 21, and is driven at a constant speed. At the same time, in FIG. 1, the arm 70 is driven by the pin 23b due to the displacement of the pinch roller 23, and is rotated clockwise around the shaft 70a, so that it is separated from the pin 71a and the winding roller 71 is moved from the spring 72. It moves to the take-up reel stand 9 side by the urging force of , and drives the take-up reel stand 9 in pressure contact. At this time, as shown in FIG. 9, the loading arm 44 is connected to the switch lever 67 at the corner 44c
Push in the protruding piece 67b of the switch lever 67'.
is rotated counterclockwise around the shaft 73, the pressure of the switch 64 against the actuator 64a is released, the switch 64 is turned off, and the motor 2 is turned off.
9 is stopped. However, since there is usually inertia in the drive system from the motor 29, the worm gears 34, 34' will try to rotate a little further, but if there is excessive inertia, the worm gear 34 will rotate as shown in FIG. The amount of rotation of the pin 34c is limited by contacting the bent portion 11d of the guide base 11. Furthermore, even if the switch 64 is turned off by the loading arm 44 and the rotation of the motor 29 is stopped, the drive system will not be reversed because of the large reduction ratio engagement between the worm 33 and the worm gears 34, 34'. , 5, and 9 can be maintained.

As described above, the magnetic tape 42 in the cassette 54
By pulling out the magnetic recording head outside, attaching it to the rotating magnetic head of the rotating head cylinder 12, and pressing the pinch roller 22 to the capstan 21, the operating mode of the magnetic recording/reproducing apparatus can be switched from the stop mode to the playback or recording mode. (See Figure 13).

<Recording/playback mode → stop mode> In addition, when the stop button 3 in FIG. 7 is released. Therefore, slider 5
9. Since the arms 60 and 61 are released, the slider 62 is returned by the biasing force of the tension spring 58 as shown in FIG. 2, and the arm 61 is rotated counterclockwise.
0 is rotationally displaced clockwise. On the other hand, as the rising portion 62c of the slider 62 moves backward in FIG.
3 in the counterclockwise direction and presses the actuator 65a of the switch 65 to turn on the motor 2.
9 starts clockwise rotation. Furthermore, at this time,
The rising portion 62e of the slider 62 has retreated to a position where it substantially contacts the tapered portion 67a of the switch lever 67. The worm gears 34 and 34' are driven by the rotation of the motor 29 via the belt 32, the pulley 31, and the worm 33, and the worm gear 34 is driven counterclockwise, and the worm gear 34 is driven counterclockwise.
4' rotates clockwise. Therefore, as the pin 34'c moves, the loading arm 44 is rotated counterclockwise by the force of the tension spring 53, and the bent portion 50b is locked in the hole 1a formed in the base 1. . As the loading arm 44 further rotates, the pinch roller 22 is released from the capstan 21 and the arms 47 and 48 continue to bend, causing the pinch roller 22 to separate from the capstan 21 and at the same time move the take-up side reel of the take-up roller 71. The pressing drive against the table 9 is also released, and the connecting pin 49 eventually comes into contact with the semicircular portion 50c of the arm 50 and its movement is stopped.

In this way, after the pinch roller 22 is no longer pressed and the magnetic tape 42 is released, the springs 35, 35' of the worm gears 34, 34' return to their original displacements and lock the guide mounting base members 24, 24'. The pressure on the members 41, 41' is released, and the link members 36, 37, 38, 36', 37', 3
8', the guide mounting base members 24, 2
4' retreats along the grooves 11a, 11b of the guide base 11. At this time, the take-up side reel stand 9 and the supply side reel stand 10 take up (unload) the magnetic tape 42 pulled out of the cassette 54 by a take-up mechanism (not shown) separate from the take-up roller 71. ) is becoming possible.

On the other hand, the arm 78 is displaced somewhat due to the rotational force applied in the clockwise direction by the operation of the stop button 3, but it is eventually pushed by the rear part of the guide mounting base member 24 that has retreated and guides the tape. pin 74
The strip member 76 is displaced until it is located inside the cassette 54, and the braking of the strip member 76 to the supply reel stand 10 is also released. When the guide mounting base members 24, 24' return to the position where the correction posts 26, 26' and the cylindrical guide bodies 27, 27' are located within the cassette 54, as shown in FIG. 4, the pin 3 of the worm gear 34'
4'c pushes the tapered part 69b of the arm 69 and rotates the arm 69 around the shaft 69a as shown in FIG.
Rotate counterclockwise. At this time, the bent portion 69c of the arm 69 is connected to the straight portion 6 of the switch lever 67'.
7'b and rotates the switch lever 67' clockwise to release the actuator 65a of the switch 65 and turn off the switch 65. Normally, the worm gears 34 and 34' continue to rotate due to the inertia of the motor 29 and the drive system, but if there is excessive inertia, the worm gears 34 and 34' continue to rotate as shown in FIG.
The pin 34c installed in the guide base 11 contacts the bent portion 11c of the guide base 11 to restrict its rotation.

As described above, by rewinding the magnetic tape 42 pulled out of the cassette 54 to its original position and releasing the pinch roller 22 from the capstan 21, the operating mode of the magnetic recording/reproducing apparatus can be changed from the recording or reproducing mode. It is switched to the stop mode (see FIG. 12).

〔Effect of the invention〕

According to the present invention, the magnetic tape pull-out operation, the pinch roller crimping operation, and the motor control operation are all performed by a rotating member driven by a single motor rotation, so the configuration is simple, inexpensive, power-saving, and reliable. You can get high quality equipment.

Further, according to the present invention, since the pinch roller crimping operation can be shared by the motor for driving the magnetic tape pull-out means, there is no need for a pinch roller crimping solenoid and a circuit for driving it, and furthermore, each drive operation and motor rotation stop switch operation can be performed separately. are operated by the same rotating body driven by a motor,
Malfunctions such as disturbances in the motion sequence or incomplete motions can be treated as non-factors.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the pinch roller drive device of the magnetic recording/reproducing device of the present invention, and FIG. 2 is a plan view showing an embodiment of the pinch roller drive device of the magnetic recording/reproducing device of the present invention. FIG. 3 is a left side view of a portion of FIG. 2, FIG. 4 is a plan view of the tape running system of the apparatus shown in FIG. 1 when it is stopped, and FIG. 6 is a sectional view of a portion of the tape loading mechanism of the device shown in FIG. 1; FIG. 7 is a motor circuit diagram of the device shown in FIG. 1; Figures 8 to 11 are plan views for explaining the motor switch operation, and Figure 8 is an explanatory diagram when the motor switch of the apparatus shown in Figure 1 is closed when a tape is loaded by operating the play/record button. The figure is an explanatory diagram when the switch turned on in Figure 8 is opened after a predetermined time has elapsed from the state in Figure 8, and Figure 10 is an explanatory diagram when the switch of the motor shown in Figure 1 is closed when no loading is performed by operating the stop button. Fig. 11 is an explanatory diagram when the switch turned on in Fig. 10 is opened after a predetermined period of time has elapsed from the state shown in Fig. 10;
13 is a plan view showing the tape loading mechanism in the unloading state, and FIG. 13 is a plan view showing the tape loading mechanism in the loading state. 12... Rotating head cylinder, 21... Capstan, 22... Pinch roller, 26, 26'
...Correction post, 27, 27'...Cylindrical guide body, 29...Motor, 35, 35'...Spring, 4
1,41'...Locking member, 42...Magnetic tape,
54...cassette.

Claims (1)

[Scope of Claims] 1. In a magnetic recording and reproducing apparatus of a type in which a magnetic tape contained in a cassette is pulled out from the cassette and is run along a magnetic head to record or reproduce signals, the magnetic tape in the cassette is a magnetic tape pull-out means that reciprocates between a first position for pulling out the magnetic tape and a second position for pulling the magnetic tape out of the cassette and adhering it to the magnetic head; A motor that can be rotated and reversed, a capstan,
A pinch roller cooperates with the capstan to feed the tape at a constant speed, and the pinch roller is pressed against the capstan by the rotational force (forward rotation) of one of the forward and reverse rotations of the motor, and the other of the motor pinch roller driving means for separating the pinch roller from the capstan by a rotational force (reverse rotation);
The rotation of the motor is transmitted to the magnetic tape pulling means and the pinch roller driving means, and after the pinch roller is pressed against the capstan, the rotation (normal rotation) of the motor is stopped and the magnetic tape is rotation transmission/motor control means for stopping the rotation (reverse rotation) of the motor after the motor is returned to the first position, the rotation transmission/motor control means being operatively coupled to the motor and the pinch roller drive means. It is characterized by comprising a rotating body, and an engaging member provided on the rotating body, which operatively engages the pinch roller driving means and the motor with the rotational force of the rotating body, and drives/controls them. A magnetic recording and reproducing device. 2. Claims characterized in that the rotation transmission/motor control means presses the pinch roller against the capstan after the tape pull-out means moves to the second position and until the motor stops. 2. The magnetic recording and reproducing device according to item 1.