JPS62143252A - Loading device for magnetic tape - Google Patents

Abstract

PURPOSE:To adjust each angle position between a tape shifter and a pinch roller singly by separately providing the tape shifter to the pinch roller. CONSTITUTION:In energizing a motor 18 at the initial state when tape shifters 43, 63 and pinch rollers 83, 93 are placed in the inner aperture 12 of a magnetic tape 11, a shifter cam gear 20 is driven counter clockwise and a shifter cam gear 30 is driven clockwise. A shifter holder 40 is guided in a shifter guide slot 13a and other shifter holder 60 is moved while being guided by a shifter guide slot 13b. Thus, a magnetic tape 11 is pulled out externally by the tape shifters 43, 63. A pinch roller arm 80 is driven clockwise and a pinch roller arm 90 is driven counter clockwise. The position of the tape shifter 43 is regulated accurately by V slots 58, 59 and the position of the tape shifter 63 is similarly regulated by V slots 78, 79.

Description

Detailed Description of the Invention (a) Technical Field The present invention relates to a magnetic tape loading device, and more particularly, the present invention relates to a magnetic tape loading device, and more particularly, to a magnetic tape loading device that loads a magnetic tape stored in a cassette using a tape shifter to load a magnetic tape into a magnetic tape with a magnetic head placed outside the cassette. This invention relates to a magnetic tape loading device that can be pulled out to the capstan position.

(b) Prior Art This type of magnetic tape loading device uses a tape shifter to pull out the magnetic tape to the outside of the cassette, and also uses the tape shifter to move the pinch roller, which is located in the opening of the cassette in the initial state. The magnetic tape is moved out of the cassette in conjunction with the withdrawal operation of the magnetic tape, so that the magnetic tape is pressed into contact with the capstan.

Regarding such a loading device in a magnetic recording/reproducing device, the present applicant previously proposed Japanese Patent Application Laid-Open No. 55-1504.
In the invention according to No. 07 (Japanese Patent No. 57-74860), the tape shifter and the pinch roller are supported by the same member. However, since the tape shifter and pinch roller tend to be attached to the same member in this way, if the tape shifter and pinch roller axes are tilted with respect to the capstan and each head, it is necessary to adjust each separately to make them parallel. In addition, it is actually extremely difficult to reduce the variation in parallelism due to the processing accuracy and assembly accuracy of each component. If there is even a slight inclination in the tape shifter or pinch roller axis, the tape will run unstable and the height of the tape in relation to the track position of the magnetic head will not be constant, making it impossible to record and play properly and make it unusable. This inconvenience arises.

(c) Purpose The present invention has been made in view of the above circumstances, and its purpose is to be able to adjust the pinch roller and tape shifter individually, and to adjust the position of the tape shifter relative to the capstan. An object of the present invention is to provide a magnetic tape loading device that can greatly increase parallelism and prevent the tape from changing its position while it is running.

(d) Structure The magnetic tape loading device according to the present invention uses a cassette containing a wound magnetic tape and having an opening in a part thereof, and uses a tape shifter to move the magnetic tape in the force cellar 1- into the opening. When pulled out, the initial position where the pinch roller is in the opening of the cassette, the ready position where the pinch roller is close to the capstan provided outside the cassette, and the same ready position where the pinch roller is close to the capstan provided outside the cassette. In a magnetic tape loading device that moves the magnetic tape so that the pinch roller can be moved from the initial position to the operating position, the magnetic tape is moved by the pinch roller arm that is rotated to move the pinch roller from the initial position to the operating position, and the tape shifter. The tape shifter is configured to include a shifter holder that is rotated to be pulled out and is formed separately from the pinch roller arm, and a shifter stopper that regulates the angular position of the shaft of the tape shifter in the preparation position. This is a characteristic feature.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a cassette 10 stores a wound i-low tape 11, and the front surface of the cassette 10 has an opening 12 for drawing out the tape. Such a cassette 10 can be attached to a magnetic recording and reproducing device, and the base 13 of this magnetic recording and reproducing device includes:
A multi-channel magnetic head 14, 15 is fixed. Further, the base 13 of the magnetic recording/reproducing apparatus includes capstans 1G on the downstream side of the magnetic head 14 and on the upstream side of the magnetic head 15, respectively.

17 are arranged. Furthermore, a motor 18 for driving tape loading is provided at the bottom of the base 13 of the magnetic recording/reproducing apparatus, and the driving force of this motor 18 is transmitted to the shifter via a driving force transmission system 19, as shown in detail in FIG. The signal is transmitted to the cam gear 20. That is,
The rotational force of the motor 18 is generated as follows: motor output shaft 19a → bevel gear 19b → bevel gear 19c → transmission shaft 19d → spur gear 1
The signal is transmitted to the shifter cam gear 20 through a transmission path from 9e to the shifter cam gear 20.

Further, a support shaft 21.31 is installed below the mounting position of the cassette 10 on the base 13 of the magnetic recording/reproducing device, and a shifter cam gear 20 is rotatably attached to this support shaft 21. . This shifter cam gear 20 has a fan-shaped tooth surface 22, and this tooth surface 22 is formed in the driving force transmission system 1.
It is meshed with a spur gear 19e which is the output part of No.9.

A fixing pin 23 is fixed on the shifter cam gear 20, and one end of a tension spring 24 is attached to the fixing pin 23. Further, a support shaft 25 is installed on the outer side of the shifter cam gear 20, and this support 1lill12
A shifter II fj3 arm 26 is rotatably attached to the shifter holder 40, which will be described later.
A drive roller 25a for driving is rotatably attached. The other end of the above-described tension spring 24 is attached to one arm of the shifter drive arm 26, giving the shifter drive arm 26 a clockwise rotational habit.

On the other hand, the shifter cam gear 30 rotatably supported by a support shaft 31 installed at a position symmetrical to the support shaft 21 has a shape symmetrical to the shifter cam gear 20, and its tooth surface 32 is similar to the tooth surface 22. It meshes with the Furthermore, the above-mentioned fixing pin 23. Tension spring 24. Support shaft 25, drive roller 25a,
At positions symmetrical to the shifter drive arm 26.

A fixing pin 33, a tension spring 34, a support shaft 35, a drive roller 35a, and a shifter drive arm 36 are provided, and the shifter drive arm 36 is given a counterclockwise rotational habit.

Further, as shown in FIG. 4, the shifter cam gear 20 has a guide 1-elongated hole 20a bored along the tooth surface 22, and the guide elongated hole 20a has a hole 20a on one end of the shifter holder 40. A driven pin 44 implanted in the shifter holder 40 is slidably fitted therein, and a shaft support 41 having a shaft hole is formed at the other end of the shifter holder 40 .

A shaft 42 is implanted and fixed in the shaft hole of the shaft support 41, and the lower portion of the shaft 42 is guided into the arc-shaped shifter guide groove 13a.

Further, a tape shifter 43 is rotatably attached to the upper middle part of the shaft 42 via a ball bearing (not shown in the figure), and further near the upper end (in FIG. 3) and the lower end of the shaft 42. In the final region of the magnetic tape 11 being pulled out, the intermediate portion is formed by a V-groove 59 of the adjusting plate 52, which will be described later.
and V! formed in the stopper body 51. il 58
The position is regulated by making contact with the

A shifter holder 60 symmetrical to the shifter holder 40 is also arranged on the shifter cam gear 30 side, and includes a shaft support 61, a shaft 62, and a shaft 62 formed symmetrically with each of the above-mentioned members.
A tape shifter 63 and a driven pin 64 are respectively provided, and a guide elongated hole 30a is provided in the shifter cam gear 30.
(not shown) is formed.

As shown in detail in FIG. 3, the shifter stopper 50 described above has a stopper body 51 fixed to the base 13 of the magnetic recording/reproducing apparatus, and the lower end of the shaft 42 is attached to the lower tip of the stopper body 51. A V groove 58 is formed for locking and regulating the position, and a VN 59 formed at the tip of the adjustment plate 52 is provided at the top end for locking the upper end of the shaft 42 and regulating the position. . The adjustment plate 52 is formed of an inverted leaf spring material, and the tip (lower end) of the falling part is fixed to the stopper main body 51 with a fixing screw 53, and the intermediate part is fixed to the stopper body 51. An adjustment screw 54 is attached for finely adjusting the V groove 59 of the adjustment plate 52 in the left-right direction in the figure against the biasing force of the adjustment plate 52 itself in the counterclockwise direction around the fixing screw 53 of the adjustment plate 52. It is being Further, a long hole 57 is bored in the flat part of the adjustment plate 52,
The adjustment plate 52 is fixed in the long hole 57 in the direction perpendicular to the plane of the paper in FIG. 3, and in the left-right direction in FIG.
An eccentric screw 56 is engaged for fine adjustment in the twisting direction using 3 as a fulcrum. Further, a fixing screw 55 for fixing the adjustment plate 52 after fine adjustment is provided at the intermediate portion between the elongated hole 57 and the V-groove 59.

A shifter stopper 70 similar to the shifter stopper 5o is provided at a symmetrical position on the left side of the base 13 of the magnetic recording/reproducing device, and this shifter stopper 70 also has a stopper body 71, an adjustment plate 72, a fixing screw 73, and an adjustment screw as described above. 74, fixing screw 75, eccentric screw 76, long hole 77, groove 7
8.79.

On the other hand, the magnetic head 14 of the base 13 of the magnetic recording/reproducing device.
A support shaft 81 is fixed to the front of 15, and this support shaft 81 has a
A middle portion of the pinch roller arm 80 is rotatably supported, and a support shaft 82 is fixed to the tip end of the pinch roller arm 80, and a pinch roller 83 is rotatably supported on the support shaft 82. ing. In addition, a support fi1f191 is fixed at a position symmetrical to the support 11ill181, and this support 1Ii111
91 supports a pinch roller arm 90 symmetrical to that described above, and this pinch roller arm 90 also has a support shaft 92 symmetrical to that described above;
A pinch roller 93 is attached. A tension spring 100 is hooked between the pinch roller arms 80 and 90, and the tension spring 100 brings the two pinch rollers 83 and 93 into a state where they are almost facing each other in the initial position shown in FIG. It is designed to be held at

The reference numeral 101 is a microswitch that is pressed via the operating member 103 when the shifter cam gear 20 is returned to the initial position before the magnetic tape 11 is pulled out, and the reference numeral 102 is a microswitch that is pressed when the shifter cam gear 20 is returned to the initial position before pulling out the magnetic tape 11. That is, it is a microswitch that is pressed when the magnetic tape 11 is driven to the draw-out completion position (preparation position).

In the magnetic tape loading device according to the present embodiment configured as described above, in the initial position shown in FIG. It is in the initial state where 83 and 93 are located. When the motor 18 is energized in this state, the rotation of the motor 18 is transmitted to the spur gear 19e via the bevel gears 19b, 19c and the transmission shaft 19d forming a driving force transmission system, and the shifter cam gear 20 is activated by the spur gear 19e. Rotates counterclockwise around support $11121. Accordingly, the shifter cam gear 30 also rotates clockwise about the support shaft 31.

Then, the driven pin 44 implanted at one end of one shifter holder 40 is pressed by the tip of the shifter drive WjJ arm 26, and the shifter holder 40 has a shaft 42 attached to the other end that is connected to the arc-shaped shifter guide. Since it is guided by the groove 13a, it moves outward and downward.

At the same time, one end of the other shifter holder 60 is driven by the shifter driving arm 36, and the other end is guided by the shifter guide groove 13b and moves. For this purpose, the magnetic tape 11 is pulled out by the tape shifter 43.63.

As the magnetic tape 11 is drawn out in this manner, the side portion of the pinch roller arm 80 is suppressed by the driving roller 25a against the tensile force of the tension spring 100, and the pinch roller arm 80 is rotated around the support shaft 81. Rotate in a clockwise direction.

At the same time, the pinch roller arm 90 also moves to the driving roller 35a.
rotates counterclockwise around the support shaft 91.

As the rotation of the shifter cam gear 20 further progresses, the lower and upper ends of the shaft 42 abut against the V grooves 58 and 59, respectively, and the micro switch 102 is accordingly pushed by the end of the shifter cam gear 20. Be manipulated. At this time, the driven pin 44 is inserted into the guide elongated hole 20a.
There is a slight gap in the longitudinal direction of the shifter cam gear 20, and since it is moved only by the shifter drive arm 2G, the shifter cam gear 20 has a slight gap due to the delay in operation until the micro switch 102 controls the motor 18 to stop. Even if there is an error, it is absorbed by the guide slot 20a, and the accurate positioning of the tape shifter 43 is controlled by the V-groove 58.
．． 59. Moreover, tape shifter 43
Even if there is some play in the shaft 42, the upper and lower ends of the shaft 42 will be V.
Since the grooves 58 and 59 are pressed by the tensile force of the tension spring 24, backlash is absorbed. As described above, the position of the tape shifter 63 is also regulated by the V grooves 78 and 79, so that the tape shifter 63 can be positioned accurately.

In this situation, the pinch roller arm 80.90
Each of the driving rollers 25a is a driving roller 25a.

35a, the pinch rollers 83, 93 are further rotated from the above-mentioned state and are in a ready state in which they approach the capstans 17 and 16. (See Figure 2) After that, the capstan motor, reel drive motor, etc. are rotationally driven by the tape constant speed drive control means (not shown), and at the same time, the pinch roller arm is rotated at 80°9 by the solenoid.
The ends of the magnetic tape 11 are rotated clockwise and counterclockwise, respectively, so that the magnetic tape 11 is pinched between each of the pinch rollers 83 and 93 and each of the capstans 17 and 16 with appropriate pressure. Magnetic head 15.14
The magnetic tape 11 runs at a constant speed while in proper contact with the magnetic tape 11, allowing desired magnetic recording and reproduction to be performed.

Here, in order to finely adjust the setting angle of each of the tape shifters 43 and 63, taking the tape shifter 43 as an example, adjust the protrusion length of the This can be done by loosening the defining screw 55 and moving the adjusting screw 54 forward and backward;
Fine adjustment of the twist angle of the V-groove 59 with respect to the reference V-groove 58 can be performed by rotating the eccentric screw 56 with the fixing screw 55 loosened. When the fine adjustment performed in this manner is completed, the fixing screw 55 is tightened and fixed, thereby fixing the position and angle of the V-groove 59 with respect to the V-groove 58 serving as a reference. This fine adjustment work can be comprehensively performed while the magnetic tape 11 is actually running.

Also, what about tape shifter 63? 1. Adjustment can also be made by rotating each of the adjusting screw 74 and the eccentric screw 76 in the same manner as described above.

On the other hand, when drawing the magnetic tape 11 in the normal recording/reproduction state into the cassette 10, the motor 18 is energized with the opposite polarity to that during the loading operation described above, and the shifter cam gears 20 and 30 are accordingly Rotate it in the opposite direction. When the shifter cam gear 20 rotates clockwise around the support shaft 21, the other shifter cam gear 30 meshing therewith also rotates counterclockwise around the support shaft 31. Then, both the pinch roller arms 80 and 90 are driven by the drive roller 25a.

Since the pressing operation by 35a is gradually released, the pinch rollers 83 and 93 are retracted toward the opening 12 by the restoring force of the tension spring 100.

At the same time as this operation, the shifter holders 40 and 60 move the driven pins 44 and 6 implanted at one end of the shifter holders 40 and 60.
The tape shifters 43 and 63 attached to the other end are pulled upward in FIG. and 7
8. Retract from 79 and shifter guide grooves L3a and 13
b, and is moved into the opening 12 of the cassette 10, and is restored to the initial state as shown in FIG. While this operation is in progress, the magnetic tape 11 that has been pulled out of the opening 12 of the cassette 10 is wound into the cassette 10 by controlling the reel drive motor by a slack tape winding control means (not shown). I can do it. and,
When the microswitch 101 is pushed by the end of the shifter cam gear 20 via the operating member 103, a control means (not shown) is actuated to stop the motor 18, completing a series of operations.

It goes without saying that the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the spirit thereof.

(e) Effect As described above, according to the present invention, since the tape shifter is provided separately from the pinch roller, the respective angular positions of the tape shifter and the pinch roller can be adjusted independently. Since the tape shifter is accurately regulated in position by the shifter stopper, dimensional deviations of various component parts can be absorbed. In this way, the angular position of the tape shifter and pinch roller can be controlled parallel to the capstan and the magnetic head, so extremely stable tape running performance can be obtained.

Moreover, such advantages can be achieved without significantly increasing the number of component parts or improving dimensional accuracy separately, so that no increase in cost occurs.

[Brief explanation of drawings]

FIG. 1 is a plan view of a main part of a magnetic tape loading device in a magnetic recording/reproducing apparatus showing an embodiment of the present invention, and FIG. 2 is an explanation of the operation of the magnetic tape loading device shown in FIG. 1. FIG. 3 is a partially enlarged side view of FIG. 1, and FIG. 4 is a partially enlarged plan view of FIG. 10...Cassette, 11...Magnetic tape, 12...Opening. 13...Base 13a13b of the magnetic recording and reproducing device.
...Shifter guide groove, 14.15...Magnetic head, 16.17...Capstan. 18...Motor, 20.30...Shifter cam gear, 26.36
・・・・・・Shifter drive arm, 40.60・・・・・・
Shifter holder, 43.63... Tape shifter. 58.59, 78.79...V groove. 50.70...Shifter stopper. 80.90...Pinch roller arm. 83.93...Pinch roller, 101.102...Micro switch.

Claims (1)

[Claims] (1) Using a cassette that contains a wound magnetic tape and has an opening in a part, the magnetic tape in the cassette is pulled out of the opening by a tape shifter, and the pinch roller is inside the opening of the cassette. The magnetic tape is moved so that it can take an initial position, a preparation position in which the pinch roller approaches a capstan provided outside the cassette, and an operating position in which the pinch roller presses against a capstan provided outside the cassette. In the loading device,
a pinch roller arm that is rotated to move the pinch roller from an initial position to an operating position; and a pinch roller arm that is rotated to pull out a magnetic tape by the tape shifter and is formed separately from the pinch roller arm. A magnetic tape loading device comprising: a shifter holder; and a shifter stopper that regulates the angular position of the shaft of the tape shifter in the preparation position.