JPS6048816B2 - Tape travel adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape running adjustment mechanism for obtaining the optimum running condition of a magnetic tape in a VTR or the like.

Generally, in a magnetic recording/reproducing apparatus such as a VTR, a magnetic tape is pulled out from a tape storage case such as a cassette and is run along a rotating cylinder having a rotating video head over a predetermined angle.

Furthermore, in order to maintain compatibility of the device, a magnetic tape having a standard track pattern is run, and the running path of the magnetic tape around the rotating cylinder is adjusted so that normal images are reproduced. Conventionally, this tape running path was adjusted by adjusting the height of guide bodies provided on the inlet and outlet sides of a rotary cylinder relative to a reference plane, and guiding the magnetic tape by the flanges of the guide bodies to move the magnetic tape in the vertical direction. is being carried out.
The conventional tape running adjustment mechanism is explained with reference to FIG.
The cylindrical shaft 79 is fitted into the guide mounting base member 80 and the screw 5
A guide mounting base 81 is fixed by 6. 27 is a cylindrical guide body, and a shaft 27b) and a lower flange 27d are fitted onto the upper flange 27a, and the upper flange 27a and the lower flange 27
A guide element 27c is rotatably mounted between the guide elements 27b and 27c between the guide elements 27b and 27c, and is formed so as to be able to move together as a unit.

Furthermore, the cylindrical guide body 27 has a guide mounting base member 80.
It is inserted into a cylindrical shaft 79 fitted to the guide mounting base 81, and is configured to restrict the vertical position of the cylindrical guide body 27 by pressing the set screw 57 against the shaft 27b. For this reason, the position of the cylindrical guide 27 is regulated even when the cylindrical guide 27 is adjusted so that the magnetic tape 42 runs along the rotary head cylinder 12 (FIG. 1) and has an optimal running path. Since the pressing operation of the stopper 57 is horizontal, it is impossible to fix the cylindrical guide body 27 while the magnetic tape 42 is loaded. After releasing the connection and storing the magnetic tape 42 in the cassette 54, the cylindrical guide body 27 must be fixed with a set screw 57. This work is done horizontally, which makes it difficult to work.
There is a possibility that the travel path, which has been adjusted to the optimal position during fixation, may become distorted. Therefore, it is necessary to run the magnetic tape 42 again to check whether the optimum running path is maintained. If any deviation occurs, readjustment is necessary, and the magnetic tape 42 is re-threaded and stored in the cassette 54 before being fixed. This involves duplicative work, which requires a lot of time for adjustment, and has disadvantages such as poor workmanship and unstable quality.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that eliminates the drawbacks of the prior art, reduces adjustment time, facilitates adjustment work, and has stable quality.

A feature of the present invention is that after a magnetic tape is pulled out from a cassette and run along a rotating head cylinder over a predetermined angle, the running path is adjusted to match a magnetic tape having a standard track pattern. To make it possible to adjust the magnetic tape so that it runs on an optimal running path while the magnetic tape is loaded in a head cylinder, and also to regulate the position of a tape guide body while maintaining the optimal position. There is something like that.

Embodiments of the present invention shown in the drawings will be described below.

1 and 6 are a plan view and a side view showing an example of the configuration of an automatic magnetic tape loading mechanism in a magnetic recording/reproducing apparatus suitable for carrying out the present invention. be. In the figure, reference numeral 1 denotes a base on which reel shafts 9a and 10a are set up, and a take-up reel stand 9 and a supply reel stand are rotatably provided, respectively. Reference numeral 11 denotes a guide base which is attached parallel to the base base 1 by a support on the base base 1. On the top are tape guide pins 13, 14 and an erasing head 15,
Rollers 16, 17, audio control head 18
, tape guide pin 19, etc. are mounted.

Further, 21 is a capstan fixed to the flywheel 43, and the pinch roller 22 is a shaft 23a on the base 1.
The pinch roller arm 23 is rotatably supported on a pinch roller arm 23, which is rotatable relative to the pinch roller arm 23. 24 and 24' pull out the magnetic tape 42 from the cassette 54 and wind it around the rotating head sill 12 provided at an angle with respect to the basic base 1.
and correction posts 26, 2 for guiding and regulating the magnetic tape 42.
6' and a guide mounting base member on which cylindrical guide plates 27, 27' are mounted, and the arc-shaped groove 1 formed in the guide base 11
1A and llb, and its position is regulated by locking members 41 and 41' during recording and reproduction. Here, the correction posts 26 and 26' are tilted upright on guide mounting bases 25 and 25' that are rotatable around cylindrical guide members 27 and 27', respectively, and the guide mounting base members 24 and 24 are ' by screws 56, respectively. Reference numeral 78 is an arm having a tape guide pin 74 planted at one end, rotatable on a shaft 78a on the base base 1, and linked to playback/recording operations.A spring 75 is biased between the base bases 1. At the same time, one end of the strip member 76 wound around the supply side reel stand 10 in an approximately semicircular shape is connected to a pin 78.
It is rotatably supported at b.

The other end of the band member 76 is fixed to the base 1 with a screw 77. 2 and 4 are plan views showing a non-operating state of the loading mechanism section with the cassette attachment/detachment and button operation mechanisms removed, and FIG. The loading drive is shown.

FIG. 3 is a side view of FIG. 2. Here, reference numeral 29 denotes a motor for loading operation, which is fixed to the base 1, and a motor pulley 30 is fixed to the motor shaft. motor pulley 3
A pulley 31 driven by a belt 32 has a shaft 31a supported by the base 1, and a worm 33 integrally fixed thereto.

On the other hand, on the base 1, worm gears 34 and 34' that are engaged with the worm 33 and rotatable in the reaction direction are supported by shafts 34b and 34b', respectively. The pins 34a and 34a' are installed.

The ring members 36 to 38, 36' to 38' each have 2
The link members 36, 36' are pivotally connected by two pins 37a, 38a, 37a', 38a'.
The pins 36a, 36a' and the worm gear 34
, 34' are connected to the pins 34a, 34a' by springs 35, 35', and the worm gear 34
, 34' are formed with arc-shaped guide grooves.
, 35' and pins 36a, 36a' are guided and housed. In addition, pins 37a, 38a, 37a', 38a
The protruding portions of the pins 39 and 39' installed on the other ends of the link members 38 and 38' toward the base 1 are approximately on the base 1 as shown in FIGS. 2 and 6. , U-shaped grooves 40a, 40a' of guide members 40, 40' formed along arcuate grooves 11A, llb of guide base 11.
, and its movement trajectory is regulated. Further, the protrusions of the pins 39, 39' toward the guide base 11 are connected to the protrusions 24b, 24b' of the guide mount members 24, 24' on the guide base 11. Next, the configuration of the pinch roller pressure bonding mechanism will be explained.

In FIG. 2, a loading arm 44 is rotatably attached to a shaft 44a on the base 1, and one end is rotatably connected to an arm 45 by a pin 46. As shown in FIG. Furthermore, the arm 45 is connected to the arms 47 and 4 by a connecting pin 49 at the center.
8, and the other end is stretched between the end of a bracket 52 on the base 1 and a spring 53. on the other hand,
Pins 47a and 48a are installed at one ends of the arms 47 and 48, the pin 47a is engaged with a hole provided in the pinch roller arm 23, and the pin 48a is rotatable around a shaft 50a on the base base 1. It engages with a hole provided in one end of an arm 50 attached to the. Further, a spring 51 is stretched between the other end of the arm 50 and the bracket 52 on the base base 1, and the bent portion 50b of the arm 50 is connected to the base base 1.
The position is regulated within a hole 1a provided in the hole 1a. In FIG. 1, the arm 70 is rotatable about a shaft 70a, and a pin 2 on the pinch roller arm 23 is inserted into an elongated hole provided at one end.
3b is engaged. On the other hand, 71 is a take-up roller that drives the take-up reel stand 9 by pressing it with a spring 72, and is supported pivotally on an arm (not shown) provided with pins 71a and 71b. Here, the pin 71b is used to restrict movement of an arm (not shown) along a guide groove provided on the base 1, and the pin 71a is provided at a height that abuts the arm 70.
It stretches all the way. In addition, 2 to 8 are push buttons for each operation, 2 is a pause button, 3 is a stop button, 4 is an FF button, and 5 is a pause button.
is a playback button, 6 is a REW button, 7 is a record button, and 8 is a dubbing button. The slider 59 is linked to the playback button 5 and the record button 7, is attached to be slidable left and right on the base 1, and has the other end engaged with an arm 60 that can rotate around a shaft 60a on the base 1. There is. On the other hand, a pin 60b planted at the other end of the arm 60 is engaged with an arm 61 that is rotatable about a shaft 61a on the base 1. In FIG. 2, the slider 62 is slidably mounted through guide holes 62a, 62b and a guide pin on the base 1, and an elongated hole 62a' engages with a pin 61b set on the arm 61. Further, a spring 58 is stretched between the slig 62 and the base 1. 6
3 is a switch board fixed on the base 1 with a bracket 66, into which switches 64 and 65 are embedded.

Here, the switches 64 and 65 are switches on the circuit connecting the motor 29 and the power source, and when the switch 64 is closed, the motor 29 rotates counterclockwise as shown in FIG. 3, and when the switch 65 is closed, the motor 29 rotates clockwise. It is composed of
FIG. 7 shows an example of the circuit configuration. Figure 8-1
In FIG. 1, the switch levers 67 and 67' are components of the same shape that can be rotated on a shaft 73 on the base 1, and are in a positional relationship that allows them to press the actuators of the switches 64 and 65, respectively. A spring 68 is stretched between 67', and the tapered portions 67a, 67a' are configured to abut against the rising portions 62c, 62e of the slider 62, respectively.

Further, the arm 69 is rotatably attached to the base 1 on a shaft 69a. On the other hand, worm gears 34, 34
' have pins 34c and 34c' installed respectively, and the pin 34c' is connected to the straight part 44b of the loading arm 44.
and the tapered portion 69b of the arm 69, and are in a height relationship that allows them to come into contact with each other. Further, the pin 34c is connected to the bent portion 11C of the guide base 11i as shown in FIGS. 2, 4, and 5.
, lld portions so that they can come into contact with each other. FIG. 13 is a detailed view showing the tape running adjustment mechanism, in which a cylindrical shaft 82 is fitted to the guide mounting base member 24, and the guide mounting base 2
5 is firmly attached by screws 56.

27 is a cylindrical guide body, and a shaft 27b and a lower flange 27d are fitted to the upper flange 27a, and a guide 27c is fitted between the upper flange 27a and the lower flange 27d so as to be rotatable around the shaft 27b. It is shaped so that it can move in unison.

Further, the cylindrical guide body 27 has a cylindrical shaft 82 fitted to the guide mount member 24 and the guide mount 25.
The end 55b of the lock pin 55 inserted into the hole 24a drilled in the side surface of the guide mount member 24 and the cylindrical guide body 2? The other end 55a of the lock pin 55 is in contact with the tapered portion 28a of the set screw 28.

Next, the operation of an example of the apparatus according to the present invention described above will be explained.

In FIG. 1, when the play button 5 or the record button 7 is pressed, the slider 59 moves to the right on the base 1 and the arm 60 moves to the right.
is rotated counterclockwise around the shaft 60a. Along with this, the arm 61 is driven by the pin 60b and rotated clockwise around the shaft 61a, and as shown in FIG. 2, the pin 61b of the arm 61 pushes the slider 62 against the biasing force of the spring 58. At this time, as shown in FIG. 8, the rising portion 62c of the slider 62 pushes the tapered portion 67a' of the switch lever 67', causing the switch lever 67' to rotate clockwise around the shaft 73, and at the same time, the switch lever 67 The biasing force of the spring 68 causes the tapered portion 67a to rotate clockwise around the shaft 73 while contacting the rising portion 62e of the slider 62, so that the switch lever 67 pushes in the actuator 64a of the switch 64- and closes the switch. Lever 6
7' releases the actuator 65a of the switch 65 from being pressed. That is, since the switch 65 is turned off and the switch 64 is turned on, the motor 29 is energized and starts rotating counterclockwise in FIG. 3. At this time, it is assumed that the play button 5 or the record button 7 is kept pressed by an existing button lock mechanism (not shown).

As the motor 29 rotates, the pulley 1J31 is rotated counterclockwise along with the shaft 31a by the belt 32, so the coaxial worm 33 rotates, and the worm gear 3
4 clockwise with respect to the shaft 34b, and the worm gear 3
4' begins to rotate counterclockwise with respect to axis 34b'. 4 Therefore, the link members 36 to 38 and 36' to 38' are
The terminal pins 39, 39' are driven via springs 35, 35', respectively, and are connected to guide members 40 formed on the base 1.
, 40' along the U-shaped grooves 40a, 40a'.

On the other hand, as shown in FIG. 6, the guide mounting base members 24, 24' placed on the guide base 11
b, 24b' and the pins 39, 39' are engaged, so as the pins 39, 39' move, the guide mounting base member 2
The correction posts 26, 26' and the cylindrical guide bodies 27, 27' placed on the cassette 54 are pulled out from the two locations shown in FIG. It starts moving along the grooves 11A, llb formed in 11. In addition, by operating the playback button 5 or the record button 7, the arm 78 is activated to release 7 around the shaft 78a.
5 enables counterclockwise rotation, and further chi i
By movement of the reel mounting base members 24 and 24', the reel base 10 rotates to the position shown in FIG. Gives you the power you need at times.

As the above operation progresses, the state shown in FIG.
Its position is regulated by coming into contact with it.

At this time, the magnetic tape 42 has tape guide pins 13, 74,
14, it contacts the erasing head 15, the roller 16, passes through a cylindrical guide 27, a correction post 26, and is wound around the rotary head cylinder 12 at a predetermined angle, and furthermore, a correction post 26',
It contacts the roller 17 and the audio control head 18 via the cylindrical guide body 27', and reaches the inside of the cassette 54 via the tape guide pin 19 and capstan 21.

Furthermore, as the rotation of the motor 29 progresses, the worm gear 34
, 34' begin to deform, and this force guide mount member 24, 24' locks into the locking member 41, 41.
′ begins to be compressed. At this time, as shown in FIG. 8, the pin 34c' mounted on the worm gear 34' begins to abut against the straight portion 44b of the loading arm 44, pushing the loading arm 44 to rotate clockwise relative to the shaft 44a. Therefore, the arm 45 is pulled against the biasing force of the spring 53, and the angle at which the arms 47 and 48 intersect is approximately 180 degrees.
The pinch roller arm 23 rotates counterclockwise with respect to the shaft 23a so that the angle approaches .degree., and the pinch roller 22 eventually comes into contact with the capstan 21. When the rotation of the worm gear 34' further advances from this state and the movement of the arm 45 advances, the arm 50 rotates clockwise with respect to the shaft 50a and the spring 51
However, the pinch roller 22 is slightly stretched and presses the magnetic tape 42 against the capstan 21, and is driven at a constant speed. 'ru. At the same time, in FIG. 1, the arm 70 is driven by the pin 23b due to the displacement of the pinch roller arm 23 described above, and is rotated clockwise around the shaft 70a, so the pin 71 is rotated clockwise around the shaft 70a.
The take-up roller 71 moves in the direction of the take-up reel stand 9 by the urging force of the spring 72, and eventually drives the take-up reel stand 9 under pressure. At this time, as shown in FIG. 9, the loading arm 44 pushes in the protruding piece 67b of the switch lever 67 with its corner 44c and rotates the switch lever 67 counterclockwise with respect to the shaft 73.
The pressure on the actuator 64a is released, the switch 64 is turned off, and the power supply to the motor 29 is stopped. However, since the drive system from the motor 29 normally has inertia, the worm gears 34, 34' rotate slightly more. If the worm gear moves forward but there is excessive inertia, the pin 34c installed on the worm gear 34 comes into contact with the cut portion 11d of the guide base 11 to limit its rotation amount, as shown in FIG. There is. Further, even if the switch 64 is turned off by the loading arm 44 and the rotation of the motor 29 is stopped, the worm 33 and the worm l, the gear 34,
It is obvious that the recording or reproducing state shown in FIG. 1 (FIG. 5, FIG. 9) can be maintained without the drive system being reversed because of the large reduction ratio provided by 34'. Next, a stop operation for canceling the above-described playback or recording state will be explained.

When the stop button 3 is pressed in FIG. 1, a button head locking mechanism (not shown) is activated, and the play button 5 or the record button 7 is unlocked. Therefore, slider 59, arm 60 and 6S1
is released, and as shown in FIG. 2, the slider 62 is returned by the biasing force of the spring 58, and the arm 61 is displaced counterclockwise and the arm 60 is displaced clockwise. On the other hand, in FIG. 10, the rising portion 62c of the slig 62 moves back, so the switch lever 67' rotates counterclockwise around the shaft 73 with the force of the spring 68, pressing the actuator 65a of the switch 65 and turning on the motor. 29 starts clockwise rotation. At this time, the rising portion 62e of the slider 62 has retreated to a position where it almost contacts the tapered portion 67a of the switch lever 67. The worm gears 34, 34' are driven by the rotation of the motor 29 via the belt 32, pulley 31, and worm 33, and the worm gear 34 and 34' rotate clockwise and clockwise, respectively. Therefore loading arm 4
As the pin 34c' moves, the arm 50 begins to rotate counterclockwise by the force of the spring 53, and the arm 50 rotates counterclockwise by the spring 51, and the bent portion 50b is attached to the base 1. It is locked in the hole 1a. As the loading arm 44 further rotates, the pinch roller 22 is released from the capstan 21, and the arm 4? , 48 progress, the pinch roller 22 separates from the capstan 21, and at the same time, the pressure drive of the take-up roller 71 against the take-up reel stand 9 is released, and eventually the connecting pin 49 moves into the semi-interior 50c of the arm 50.
When it comes into contact with the object, its movement stops. Thus magnetic tape 4
2 is released, the springs 35, 35' in the worm gears 34, 34' return to their original positions, and the pressure of the guide mounting base members 24, 24' against the locking members 41, 41' is released. , further link members 36-38, 36'-3
8', the guide mount members 24, 24' retreat along the grooves 11A, llb of the guide base 11. At this time, the reel stand 9 or 10 is pulled out of the cassette 54 by a winding mechanism (not shown) separate from the winding roller 71 and is driven to wind the magnetic tape 42.
On the other hand, the arm 78 is rotated clockwise by the operation of the stop button 3, and is slightly displaced, but is eventually pushed by the rear part of the guide mounting base member 24, which has retreated, and pinned to the tape guide pin. 74 is displaced until it is located within the cassette 54, and the strip member 76 also releases the brake on the supply side reel stand 10. Guide mounting base member 24, 274'
When the correction posts 26, 26' and the cylindrical guide bodies 27, 27' return to their positions in the cassette 54 as shown in FIG. 4, the pin 3IC of the worm gear 34'
' is a tapered portion 69b of the arm 69 as shown in the first unit L.
Press to rotate the farm 69 counterclockwise about the shaft 69a. At this time, the bent portion 69c of the arm 69 comes into contact with the straight portion 67b' of the switch lever 67' and rotates the switch lever 67' clockwise to release the actuator 65a of the switch 65 and turn off the switch 65. 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 pin 34c set on the worm gear 34 will guide the worm gear 34, as shown in FIG. The amount of rotation is regulated by contacting the bent portion 11c of the base 11. Next, the tape running adjustment mechanism will be explained with reference to FIGS. 5 and 13.

FIG. 5 shows correction posts 26, 26 placed on guide mount members 24, 24' by operating the record or play button.
' and the cylindrical guide members 27, 27' pull out the magnetic tape 42 from the cassette 54, wind it around the rotary head cylinder 12 at a predetermined angle, and run the magnetic tape 42 along with it. 42
The cylindrical guide bodies 27, 27 are used to match the running path of the magnetic tape with the running path of a magnetic tape having a standard track pattern.
The magnetic tape 42 is moved upward or downward by adjusting the height position of '. To explain in detail in FIG. 13, the cylindrical guide body 27 has an upper flange 27a) shaft 27b) guide element 2.
7c) Since it is integrally formed with the lower flange 27d, by rotating the upper flange 27a to the right or left, the shaft 27b fitted on the upper flange 27a is fitted onto the shaft 27b and is threadedly engaged with the cylindrical shaft 82. Under the condition. The flange 27d moves upward or downward.

Therefore, as the upper flange 27a and the lower flange 27d move, the magnetic tape 42 is guided by the flanges of the flanges and moves upward or downward. In order to maintain the optimum running path for the magnetic tape 42 after the optimal running path has been obtained, the end 55a of the lock pin 55 embedded in the guide mount member 24 strongly tightens the set screw 28. Is there a component of force in the horizontal direction that is pressed by the tapered portion 28a? The other end 55b of the receiving lock pin 55
firmly presses the shaft 27b of the cylindrical guide 27, and the shaft 27
In other words, by regulating the position of the cylindrical guide body 27, a stable running path for the magnetic tape 42 can be ensured.

4. As is clear from FIGS. 5 and 13, the above-mentioned adjustment and position regulation work can be carried out in one direction while the magnetic tape 42 is running along the rotary head cylinder 12. .

As described in detail above, according to the present invention, in an apparatus for adjusting the running path of a magnetic tape to a rotary head cylinder, particularly in order to maintain compatibility of the apparatus, the first and second cylindrical guide members are By using the height position adjusting means and the first and second position regulating means, it is possible to work in one direction even when the magnetic tape is loaded in the rotary head cylinder, reducing adjustment time. It has the advantage of simplifying the adjustment work and, therefore, ensuring stable quality.

・Brief explanation of the drawings Figure 1 is a reproduction (recording) diagram showing the general structure of the mechanism according to the present invention.
FIG. 2 is a plan view of the configuration shown in FIG. 1 in a stopped state showing the drive system of the tape loading mechanism;
3 is a side view of FIG. 2, FIG. 4 is a plan view of the tape running system in a stopped state of the configuration shown in FIG. 1, and FIG. 5 is a side view of the configuration shown in FIG. FIG. 6 is a side view showing the drive system of the tape loading mechanism, and FIG. 7 is a circuit diagram showing an embodiment of the drive motor circuit according to the present invention. , FIGS. 8 to 11 are plan views of main parts for explaining the switch operation of the drive motor, FIG. 12 is a sectional view showing a conventional tape travel adjustment mechanism, and FIG. 13 is a tape travel adjustment according to the present invention. FIG. 3 is a cross-sectional view of the mechanism.

1: Base, 5: Play button, 7: Record button, 3: Stop button, 9: Take-up reel stand, 10: Supply reel stand, 11
: Guide base, 12: Rotating head cylinder, 21: Capstan, 22: Pinch roller, 29: Motor, 33:
Worm, 34: Worm gear, 42: Magnetic tape, 4
4: Loading arm, 35: Spring, 24: Guide mounting base member, 2? : Cylindrical guide body, 28: Set screw, 41
: Locking member, 55: Lock pin, 69: Arm, 67:
Switch lever, 68: Spring, 63: Switch board, 6
4, 65: switch, 45, 47, 48, 50: arm.

Claims (1)

[Claims] 1. In a magnetic recording/reproducing device in which a magnetic tape stretched between a supply reel and a take-up reel is pulled out and run along a rotating head cylinder over a predetermined angle, the rotating head of the magnetic tape The first guide means and the second guide means are provided to adjust the traveling path for the cylinder, and the first position regulating means and the second position regulating means are provided to maintain the adjusted traveling route, and the first and second guiding means are provided. The second guide means is configured to be able to finely adjust the tape running height, and after adjustment, is embedded so as to be movable in a direction perpendicular to the adjustment direction of the first and second guide means, and Consisting of a locking member provided so that one end thereof is in contact with the other, and a set screw arranged so as to be able to press the other end of the locking member, and mounted so as to be tightenable from the same direction as the adjustment direction of the guide means. A tape running adjustment mechanism featuring: