JPS6017072Y2 - Pinch roller crimping mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operation mechanism for a pinch roller that drives a magnetic tape by pressing it against a capstan in a tape recorder or the like.

Conventionally, the majority of pinch roller crimping mechanisms used in tape recorders and the like are linked to button operations, and crimping is performed by pressing the button.However, in this method, the force required to deform the elastic body for crimping is Since it requires a button, it usually has the disadvantage of requiring a lot of force to operate the button.

In addition, in a device that performs pinch roller crimping using an electromagnet,
The buttons can be operated easily, but during crimping, electricity is continuously applied and consumes a large amount of power.

In addition, in order to make the pinch roller move backward over a wide range in a VTR, etc., a considerably large device is required, which increases costs, and usually requires a complicated mechanism such as a button pressing operation. Ta.

An object of the present invention is to eliminate the drawbacks of the prior art described above, and to provide a pinch roller crimping mechanism that is inexpensive, remotely controllable, and consumes little power.

In this invention, in order to enable remote control, we use a motor as the power source, and so that we can use a small, inexpensive motor, we increase the motor output torque with a rotational reduction mechanism, and then operate the pinch roller crimping via a boosting mechanism. In this case, the rotational deceleration mechanism works to stop the return reaction force after the pinch roller crimping operation, so there is no need to supply power to the motor or a locking mechanism. It is characterized by what it did.

Hereinafter, embodiments of the present invention shown in the drawings will be described.

1 to 6 are a plan view and a side view showing the structure of an automatic magnetic tape loading mechanism in a magnetic recording/reproducing apparatus according to the present invention.

In the figure, reference numeral 1 denotes a basic base, on which the reel shaft 9a and lea are set up, and the reel stand 9 on the take-up side and the reel stand 1 on the supply side, respectively.
0 is rotatably provided.

Reference numeral 11 denotes a guide base, which is mounted parallel to the base base 1 by a support on the base base 1, and on the guide base 11 are tape guide pins 13, 14, an erasing head 15, rollers 16, .
17 audio, a control head 18, a tape guide pin 19, etc. are mounted.

Further, 21 is a capstan fixed to a flywheel 43, and the pinch roller 22 is rotatably supported on a pinch roller arm 23 which is rotatable about a shaft 23a on the base 1.

24. 24' pulls out the magnetic tape 42 from the cassette 54, winds it around the rotary head cylinder 12 that is provided at an angle with respect to the base 1;
The guide mounting on which the correction post 26.26' and the cylindrical guide body 27.27' are mounted is a base member, and the guide is guided by the arc-shaped grooves 11a and llb formed in the guide base 11, and the recording, During playback, the locking members 41, 4
1' also regulates its position.

Here, the correction posts 26 and 26' are mounted on a base 25, which is rotatable around a cylindrical guide body 27 and 27', respectively.
．． 25', and the guides are mounted on the base members 24 and 24' with screws 56, respectively.

Reference numeral 78 denotes an arm having a tape guide pin 74 planted at one end, which is rotatable on a shaft 78a on the base base 1 and is linked to playback and recording operations. At the same time, one end of a band member 76 wound approximately semicircularly around the supply reel stand 10 is rotatably supported by a pin 78b.

The band member 76 is fixed to the base 1 with a screw 77 at the other end.

2 and 4 are plan views showing a non-operating state of the loading mechanism with the cassette attachment/detachment and button operation mechanisms removed. The drive section is shown.

FIG. 3 is a side view of the main part 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.

Pulley 3 driven by belt 32 from motor pulley 30
1, a shaft 31a is supported by the base 1, and a worm 33 is fixed integrally therewith.

On the other hand, on the base 1, there are worm gears 34, 34' that are engaged with the worm 33 and are rotatable in opposite directions.
4b and 34b', and a pin 34at34a' is installed in each of the worm gears 34 and 34'.

The link members 36-38, 36'-38' each have 2
Two pins 37at 38at 37a't 38a
The link member 3 is rotatably connected by the link member 3.
Pins 36a, 36a' set on 6.36' and pins 34a, 34a' set on worm gear 34.34'
The spring 35, 35' and the pin 36a are connected by a spring 35, 35', and an arcuate guide groove is formed inside the worm gears 34, 34'.

36a' is guided and stored.

In addition, pin 37at 38at 37a't 3
8a' and the pins 39 and 39' planted on the other ends of the link members 38 and 38', respectively, protrude toward the base 1 side approximately on the base base 1 as shown in FIGS. 2 and 6. 0-shaped grooves 40a of guide members 40 and 40' formed along arcuate grooves 11a and llb of guide base 11, respectively.

40a' and its movement trajectory is regulated.

Furthermore, the protruding portions of the pins 39 and 39' toward the guide base 11 are attached to the guide base members 24 and 24' on the guide base 11.
are connected to the protrusions 24b and 24b'.

Next, the configuration of the pinch roller pressure bonding mechanism will be explained.

In FIG. 2, the loading arm 44 is connected to the shaft 4 on the base 1.
4a, and one end is rotatably connected to the arm 45 by a pin 46.

Further, the arm 45 has a central portion rotatably connected to the arms 47 and 48 by a connecting pin 49, and the other end is connected to the base 1.
It is stretched between the end of the upper bracket 52 and the spring 53.

On the other hand, pins 47a and 48a are provided at one end of the arms 47 and 48.
The pin 47a is engaged with a hole provided in the pinch roller alarm 23, and the pin 48a is provided at one end of an arm 50 rotatably attached to a shaft 50a on the base 1. It engages the hole.

Also, the other end of the arm 50 and the bracket 5 on the base 1 are connected to each other.
A spring 51 is stretched between the arms 50 and 2.
The bent portion 50b is located within the hole 1a provided in the base 1 and its position is regulated.

In FIG. 1, the arm 70 is rotatable about a shaft 70a, and a pin 23b on the pinch roller arm 23 is engaged with a long hole provided at one end.

On the other hand, 71 is a take-up roller that is driven by pressing the take-up reel stand 9 with a spring 72, and is supported pivotally on arms (not shown) provided on 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.
1a extends to a height where it comes into contact with the arm 70.

Also, 2 to 8 are push buttons for each operation, 2 is a pause button, 3 is a stop button, 4 is an FF button, 5 is a play button, and 6 is a RE button.
The W button, 7 is the record button, and 8 is the dubbing button.

The slider 59 is connected to the playback button 5 and the record button 7, and is attached to be slidable left and right on the waist base 1.The other end of the slider 59 engages with an arm 60 that is rotatable around a shaft 60a on the base 1. ing.

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 has guide holes 62a, 62
b and is slidably attached by a guide pin on the base 1, and a long hole 62d engages with a pin 61b set on the arm 61.

Further, a spring 58 is stretched between the slider 62 and the base 1.

A switch board 63 is fixed on the base 1 with a bracket 66, and switches 64 and 65 are installed therein.

Here, the switches 64 and 65 are switches on the circuit connecting the motor 29 and the power source, and when the switch 64 closes, the motor 29 rotates counterclockwise in FIG. 3, and when the switch 65 closes, the motor 29 rotates clockwise. It is configured.

FIG. 7 shows an example of a circuit configuration.

8 to 11 are diagrams for explaining the switch operation of the drive motor, and the switch levers 67 and 67' are components of the same shape that can be rotated on the shaft 73 on the base 1, The actuators of the switches 64 and 65 are positioned in such a way that they can be pushed, and a spring 68 is stretched between the switch levers 67 and 67'.
7a' are rising portions 62c, 6 of the slider 62, respectively.
2 e.

Further, the arm 69 is rotatably attached to the base 1 on a shaft 69a.

On the other hand, the worm gears 34 and 34' have pins 34c and 34.
c' are respectively erected, and the pins 340' are at a height such that they can come into contact with the straight portion 44b of the loading arm 44 and the tapered portion 69b of the arm 69, respectively.

Further, the pin 34c is connected to the bent portions 11c and 1 of the guide base 11.
The height relationship is such that it can come into contact with the 1d portion.

Next, the operation of one embodiment of the above-described apparatus according to the present invention will be described.

In FIG. 1, when the playback button 5 or record button 7 is pressed, the slider 59 moves to the right on the base 1.

The unevenness 0 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 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.
c presses 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 moves the tapered portion 67a to the rising portion of the slider 62 due to the biasing force of the spring 68. 62e
Since the switch lever 67 is rotated clockwise around the shaft 73 while contacting the switch lever 67, the switch lever 67 pushes the actuator 64a of the switch 64, and the switch lever 67' releases the push of the actuator 65a of the switch 65.

In other words, the switch 65 is turned off and the switch 6
4 becomes "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 a general button lock mechanism (not shown).

As the motor 29 rotates, the pulley 31 is rotated counterclockwise along with the shaft 31a by the belt 32, so the coaxial worm 33 rotates, and the worm gear 34 rotates clockwise with respect to the shaft 34b. 34b' begins to rotate counterclockwise.

Therefore, the link members 36-38 and 36'-38' are
The terminal pins 39,39', each driven via a spring 35,35', are connected to a guide member 40 formed on the base 1.
．． 40' along the U-shaped groove 40a+402'.

On the other hand, as shown in FIG.
, 24b' and the pins 39, 39' are engaged, so the guide installation is not possible with the movement of the pins 39, 39'.
4. The magnetic tape 42 in the cassette 54 is pulled out from two places from the position where the correction post 26.26' and the cylindrical guide body 27.27' placed on the guide base 24' are shown in FIG. It starts moving along grooves 11a and llb formed in 11.

Further, the arm 78 can be rotated counterclockwise by the spring 75 about the shaft 78a when the playback button 5 or the record button 7 is operated, and the guide is attached to the base member 24.
24' rotates to the position shown in FIG. 1 to regulate the traveling path of the magnetic tape 42, and the supply reel stand 10 is given the necessary braking force during recording and reproduction by the strip member 76.

As the above operation progresses, the state shown in Figure 5 will be reached,
For guide installation, the base members 24 and 24' are the locking members 41 and 41.
', and its position is regulated.

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

Furthermore, as the rotation of the motor 29 progresses, the worm gear 3
The spring 35.35' in 4.34' begins to deform, and this force causes the guide mounting to occur in the base member 24.24' and the locking member 41.4.
1' begins to be crimped.

At this time, as shown in FIG. 8, the pin 34C' installed on the worm gear 34'
a, and pushes the loading arm 44 to release the shaft 44.
Rotate clockwise relative to a.

Therefore, the arm 45 is pulled against the biasing force of the spring 53, and the pinch roller arm 23 rotates counterclockwise with respect to the shaft 23a so that the angle at which the arms 47 and 48 intersect approaches approximately 180 degrees, and eventually the pinch roller arm 23 rotates counterclockwise with respect to the shaft 23a. Roller 22 contacts capstan 21.

In this state, when the rotation of the worm gear 34' further progresses and the arm 45 moves and advances, the arm 50 rotates clockwise with respect to the shaft 50a, the spring 51 is slightly stretched, and the pinch roller 22 is moved to the capstan 21. The magnetic tape 42 is pressed and 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 arm 23, and the shaft 7
Pin 71a can be rotated clockwise around 0a.
The take-up roller 71 moves away from the spring 73 toward the take-up reel stand 9, and eventually reaches the take-up reel stand 9.
Perform pressure contact drive.

At this time, as shown in FIG. 9, the loading arm 44 pushes in the protruding piece 67b of the switch lever 67 with the corner 44c and rotates the switch lever 67 counterclockwise with respect to the shaft 73, so that the actuator 64a of the switch 64 is rotated. When the pressure on the switch 64 is released, the switch 64 is turned off and the power supply to the motor 29 is stopped.

Normally, however, since there is inertia in the drive system from the motor 29, the worm gears 34 and 34' will rotate a little further, but if there is excessive inertia, the worm gears 34 and 34' will rotate as shown in FIG. The erected pin 34c comes into contact with the cut portion 11a of the guide base 11, thereby limiting the amount of rotation thereof.

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 the reduction ratio is largely maintained by the worm 33 and the worm gears 34 and 34'. It is clear that the recording or reproducing state of FIG. 1 (FIGS. 5 and 9) can be maintained.

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 locking mechanism (not shown) is activated, and the play button 5 or the record button 7 is unlocked.

Therefore, the slider 59, arms 60 and 61 are 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, 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 it "on", and the motor 29 starts rotating clockwise.

Note that 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 counterclockwise and clockwise, respectively.

Therefore, as the pin 34C' moves, the loading arm 44 begins to rotate counterclockwise by the force of the spring 53, and the arm 50 begins to rotate counterclockwise by the spring 51, causing the cutting portion 50 to rotate counterclockwise.
0b is locked in a hole 1a provided in the base 1.

As the loading arm 44 further rotates, the pinch roller 22 is released from the capstan 21 and the arm 4
7.48, as the bending progresses, the pinch roller 22 further 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 is brought into contact with the half of the arm 50. It comes into contact with the circular portion 50c and stops moving.

After the drive of the magnetic tape 42 is released, the spring 35.35' in the worm gear 34.34' returns to its original position, and the guide is attached to the locking member 41 of the base member 24, 24'.
, 41' is released, and the link member 3
6 to 38. The guide mounting for the movement of 36' to 38' is performed using the grooves 11a and 11 of the guide base 11.
Retreat along b.

At this time, the reel stand 9 or 10 is driven to wind up the magnetic tape 42 pulled out of the cassette 54 by a winding mechanism (not shown) separate from the winding roller 71, while the arm 78 is When the stop button 3 is operated, a clockwise rotational force is applied, and the guide mounting, which is slightly displaced but has finally retreated, is pushed to the rear of the base member 24, and the tape id pin 74 is positioned in the cassette 54. The strip member 76 also releases the brake on the supply side reel stand 10.

The guide is attached to the correction post 26, 26' and the cylindrical guide member 27. as shown in FIG.
27' returns to its position in the cassette 54, the pin 34C' of the worm gear 34' pushes the tapered portion 69b of the arm 69 and rotates the arm 69 counterclockwise relative to the shaft 69a, as shown in FIG. make it move.

At this time, the bent portion 69c of the arm 69 is connected to the switch lever 67.
The actuator 65 of the switch 65 contacts the linear portion 67b' of the switch lever 67' and rotates the switch lever 67' clockwise.
a is released and the switch 65 is turned off, but 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, as shown in Figure 4. As such, the pin 34c installed on the worm gear 34 comes into contact with the bent portion 11c of the guide base 11 to regulate its rotation amount.

In the above-mentioned operation, only the main mechanisms related to the pressing and releasing operations of the pinch roller, which is a feature of the present invention, are shown in FIGS. 12 and 13.

FIG. 12 shows a stopped state in which the pinch roller 22 is separated from the capstan 21, and FIG. 13 shows a state in which the pinch roller 22 is pressed against the capstan 21 during reproduction or recording operation.

According to the present invention, even when the pinch roller for driving the tape in a device such as a VTR is moved over a wide range, it can be operated using an inexpensive small motor, and an electromagnet that is used in an energized state can be used. Compared to the conventional method, power consumption is extremely low, so it is also very effective for portable type devices that use batteries, etc.

Furthermore, remote control is also possible, and it is clear that even in push-button devices, the force required to operate the buttons can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the general structure of the mechanism according to the present invention in playback and recording states, and FIG. 2 is a plan view of the structure shown in FIG.
FIG. 3 is a side view showing the main parts of FIG. 2, and FIG. 4 is a stop state showing the tape running system of the configuration shown in FIG. 1. FIG. 5 is a plan view of the configuration shown in FIG. 1, showing the tape running system in the playback and recording state, and FIG. 6 is a plan view of the configuration shown in FIG.
A side view showing the drive system of the tape loading mechanism section, FIG. 7 is a circuit diagram showing one embodiment of the drive motor circuit, and FIGS. 8 to 11.
The figure is a plan view for explaining the switch operation of the drive motor, and FIGS. 12 and 13 are plan views showing the main parts of the embodiment of the present invention in a stopped state and a reproducing (recording) state, respectively. 1: Main base, 5: Play button, 7: Record button, 3 stop button, 9: Take-up side reel stand, 10: Supply side reel stand, 11
: Guide base, 12: Rotating head cylinder, 21: Capstan, 22: Pinch roller, 29: Motor, 33
: Worm, 34: Worm gear, 42: Magnetic tape,
44: loading arm, 35: spring, 24 guide mounting base member, 41: locking member, 69: arm, 67: switch lever, 68: spring, 63: switch board, 64
．． 65: Switch, 45.47.48°50: Arm.

Claims (1)

[Scope of utility model registration request] A rotation deceleration mechanism consisting of a motor, a worm that decelerates the rotation of the motor, and a worm gear, a pinch roller that presses and drives the tape against the capstan, and a pinch roller that supports the pinch roller and is rotatable on the base. a roller arm, a rotary arm which is also rotatably disposed on the base base, at one end of which a pinch roller crimping spring is biased, and which is regulated by a stopper on the base base; and one end of the pinch roller arm; Two other arms each rotatably engaged with one end of the rotary arm and whose other ends are pivotally connected to each other in a dogleg shape, and the driving section and the pivotably connected through the rotational reduction mechanism. The reduction ratio of the rotation reduction mechanism is selected to a value that can suppress the reaction force when the pinch roller is pressed, and the dogleg-shaped peak of the arm is driven by the motor. The capstan and the pinch roller are brought into contact by driving the pivot joint so as to crush the rotary arm, and after the rotating arm is displaced and released from contact with at least the stopper on the base, the motor is rotated. A pinch roller crimping mechanism characterized by being configured to stop rotation.