JPH0731846B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus that transports a magnetic tape by pressing the magnetic tape with a pinch roller against a capstan that rotates at a constant speed.

2. Description of the Related Art In recent years, in a magnetic recording / reproducing device such as a video tape recorder with a built-in camera, reduction in size and weight has become a major issue.

An example of a conventional magnetic recording / reproducing apparatus will be described below with reference to FIGS.
Description will be made with reference to FIG.

FIG. 4 is a plan view of a conventional magnetic recording / reproducing apparatus. Fourth
In the figure, a cassette 1 contains a reel around which a magnetic tape is wound. The rotating cylinder 2 has magnetic heads 3a to 3d.
Is divided into 90 ° on the circumference of the circle. The tape guide posts 4a and 4b are arranged inside the cassette opening (shown by a chain double-dashed line) when the cassette is mounted, and when the cassette mounting is detected by the cassette detection switch (not shown), the tape loading is performed in the path indicated by the arrow. And fix it in place. Inclined post 5a is tape guide post 4a
It is fixed to the same base as. The inclined post 5b is fixed on the substrate 6. The magnetic tape 7 is sandwiched between a capstan 8 that rotates at a predetermined speed and a pinch roller 9 that presses against the capstan 8, and the rotational force of the capstan 8 is transmitted, so that the magnetic tape 7 runs at a predetermined speed. Is configured to let. A cam gear 10, which is rotated by a motor (not shown), is connected to a main rod 12 via a cam gear arm 11, and is configured to slide the main rod 12 left and right. The main rod 12 is guided by the guide pins 13a and 13b.

Next, a pinch roller crimping mechanism for crimping the pinch roller 9 to the capstan 8 will be described with reference to FIGS.
A description will be given based on the figure. The pinch roller 9 is rotatably attached to the tip of a pinch arm 16 which is rotatable around a pinch arm shaft 14 installed on the substrate 6. A pin 17 is provided at the rear end of the pinch arm 16, a groove 18a of a pinch return arm 18 is fitted into this pin 17, and a pinch return spring 19 causes a pinch return arm 18.
18 is biased in the direction in which the pinch roller 9 returns to the inside of the cassette opening. On the other hand, the pinch arm 16 is connected to the third toggle arm 22 via a toggle mechanism composed of a first toggle arm 20 and a second toggle arm 21. The third toggle arm 22 is pivotally supported at a central portion by a shaft 23 provided on the base plate 6, and the second toggle arm 21 is pivotally supported at one end of the third toggle arm 22. Further, the third toggle arm 22 is urged clockwise by a pinch pressure spring 24 connected to the other end side. Further, a cut-and-raised portion of the main rod 12 is provided at a connecting portion between the first toggle arm 20 and the second toggle arm 21.
A toggle kick pin 25 capable of contacting 15 is provided, and a kick pin 26 is provided at the tip of the main rod 12.

Next, the operation of the pinch roller pressure bonding mechanism will be described.

As described above, when loading of the cassette is detected by the cassette detection switch, the tape loading operation is performed by the motor (not shown). In conjunction with this, the main rod 12 moves to the right as shown by arrow A in FIG. The kick pin 26 provided on the main rod 12 abuts the pinch return arm 18, and the pinch return arm 18 moves to the sixth pinch return arm 18 as shown in FIG.
It rotates in the direction of arrow B in the figure. This allows the pinch arm 16
6 makes a large turn in the direction of arrow C in FIG. 6 and approaches a position close to the capstan 8. After that, the first and second toggle arms 20 and 21 are connected by the cut-and-raised portion 15 formed on the main rod 12. The toggle kick pin 25 is pressed, and the crimping force acts between the pinch roller 9 and the capstan 8.

However, if the pinch roller 9 is pulled out from the inside of the cassette opening and the crimping force between the capstan 8 and the pinch roller 9 is to be increased as described above, the pinch arm 16 is rotated greatly. There is a problem that a moving mechanism and a mechanism for generating a strong crimping force are required, and the number of parts is large and the space occupied by the mechanism is large. Therefore, it is desired to simplify the crimping mechanism of the pinch roller 9 that is crimped to the capstan 8.

The present invention solves such a problem, and an object of the present invention is to simplify the pinch crimping mechanism, reduce the size thereof, and further reduce the cost.

Means for Solving the Problem In order to solve the problem, the present invention provides a capstan that rotates at a predetermined speed, a pinch roller that presses the capstan to transfer a magnetic tape, and a pinch roller that rotates at one end. A pinch roller crimping arm that has a bearing portion that is freely held and is rotatably held by a rotation support shaft that is erected on the substrate; a first intermittent gear formed on the outer periphery of the bearing portion; and the pinch. A pressure roller that is rotatably provided at the other end of the roller pressure arm, a holding arm that is rotatably attached to a rotation shaft that is planted on the substrate, and one end of this holding arm that is supported via a rotation shaft. As well as
A pinch roller crimping gear lever having a second intermittent gear that meshes with a first intermittent gear when the pinch roller is pulled out, and a crimping portion that is provided on the pinch roller crimping gear lever and that abuts the crimping roller when the pinch roller is crimped, A stopper pin that regulates the holding arm and regulates the amount of movement of the pinch roller crimping gear lever via a rotating shaft, a crimping spring that urges the stopper arm to rotate in the direction in which the holding arm abuts, and the pinch roller crimping A cam for rotating a pinch roller crimping gear with a cam groove via a pinch crimping cam pin provided at the other end of the gear lever, and when the pinch roller and the capstan are separated from each other, the first intermittent gear Is engaged with the second intermittent gear, and the pinch roller pulls When ejected, the pinch roller crimping gear lever is rotated by the cam and the pinch roller reaches a predetermined position close to the capstan, and then the first intermittent gear and the second intermittent gear are disengaged from each other and the crimping roller is crimped. And the pinch roller crimping gear lever is pushed through the crimping portion by this abutment, the holding arm is rotated and separated from the stopper pin, and the spring force of the crimping spring from the holding arm to the pinch roller. The pinch roller is configured to generate a pressing force of the pinch roller to the capstan, which is transmitted to the pinch roller via the crimp gear lever, the crimp portion, the crimp roller, and the pinch roller crimp arm.

Operation According to this structure, the cam, the pinch roller crimping gear lever rotated by the cam, and the pinch roller crimping arm rotated by the pinch roller crimping gear lever via the first and second intermittent gears cause movement. A large pinch roller pull-out function can be provided, and a holding lever and a pressure spring can also be used to provide a pressure-bonding operation function that applies pressing force to the pinch roller via the above-mentioned members. A mechanism for pulling out the arm larger than the inside of the cassette opening portion and a mechanism for obtaining a strong crimping force with a light driving force can be realized at the same time, whereby the size and weight can be reduced and the cost can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, a rotary cylinder 33 around which a magnetic tape 32 pulled out from a cassette 31 is wound in an M shape on the outer peripheral surface is provided. The rotary cylinder 33 is composed of an upper cylinder which is rotationally driven by a drive motor and a lower cylinder on the fixed side, and a magnetic head 34a which records or reproduces data on or from the magnetic tape 32 by slightly protruding the tip of the upper cylinder. ~ 34d is attached. Around the rotary cylinder 33, the tape guide post 35a and the inclined post 3 are arranged so that the magnetic tape 32 pulled out from the cassette 31 is wound around the outer peripheral surface of the rotary cylinder 33.
Located is a first post base 37 with 6a and a second post base 38 with tape guide posts 35b.
Further, the magnetic tape 32 is sandwiched between a capstan 39 that rotates at a predetermined speed and a pinch roller 40 that is pressed against the capstan 39, and the rotational force of the capstan 39 is transmitted to the magnetic tape 32 so that the magnetic tape 32 runs at a constant speed. Is configured. further,
The tension regulator post 41 functions to detect the tension of the running magnetic tape 32 and thereby control the tension to a constant value.

Next, the tape loading mechanism will be described. The loading motor 42 has a worm gear 43, and is configured to transmit power from the worm gear 43 to the cam gear 45 via the relay gear 44. The cam gear 45 has cam grooves formed on the front side and the back side, a cam groove (cam) 45a for driving the pinch roller crimping mechanism is formed on the front side, and a cam groove 45b for driving the tape loading mechanism on the back side. Are formed. The sector gear 46 has a cam pin 47 that follows the cam groove 45b that drives the tape loading mechanism, and is rotatable about a rotation support shaft 46a. The sector gear 46 also holds the tape guide posts 35a and 35b for pulling out the magnetic tape 32 from the cassette 31, respectively.
Meshes with a gear portion formed on the first loading arm gear 48 that moves the vehicle along predetermined paths D and E. The first loading arm gear 48 is connected to the first post base 37 via the first loading rod 49.
Are linked to. The gear portion of the second loading arm gear 50 meshes with the gear portion of the first loading arm gear 48, and is connected to the second post base 38 through the second loading rod 51.

Next, the pinch roller pressure bonding mechanism will be described.

As shown in FIG. 2 and FIG. 3, the pinch roller crimping mechanism includes a pinch roller crimping gear lever 52 that is rotated by the cam groove 45a of the cam gear 45, and a pinch roller crimping gear lever 52 that is rotated by one end. Pinch roller crimping arm 55 and pinch roller crimping gear lever that press the pinch roller 40 of the above part against the capstan 39 side.
A holding arm 61 and a pressure spring 63 that rotatably support the 52 and apply a pressure contact force to the pinch roller 40 are provided.

That is, the holding arm 61 is rotatably supported via the rotating shaft 62 provided on the substrate 53, and has the rotating shaft 52a at one end.
The pinch roller crimping gear lever 52 is rotatably supported via the pinch roller, and the other end of the pinch roller crimping gear lever 52 is connected to the crimping spring 63 for adjusting the pressure contact force so that the holding arm 61 is urged to rotate in the clockwise direction. Reference numeral 64 is a stopper pin that serves as a rotation limit of the holding arm 61.

The pinch roller crimping gear lever 52 has a second gear (second intermittent gear) 57 formed at one end edge thereof, and a roller-shaped crimping portion 59 provided between the second gear 57 and the rotary shaft 52a. ing. At the other end of the pinch roller crimping gear lever 52, a pinch crimping cam pin 60 that is fitted and follows the cam groove 45a of the cam gear 45 is provided.

The pinch roller crimping arm 55 is formed in a substantially L shape, and its corners are rotatably supported on the substrate 53 via a rotation support shaft 54, and a bearing portion of the rotation support shaft 54 includes: First pinch roller crimping gear lever 52 that can be meshed with the second gear 57 of the first
Gear 56 (first intermittent gear) is fixed. The pinch roller crimping arm 55 is provided with a crimping roller 58 on one end of which the pinch roller 40 is rotatably supported and on the other end of which the crimping portion 59 of the pinch roller crimping gear lever 52 abuts. There is.

In the above structure, before the cassette 31 shown in FIG. 3 is mounted, the first gear 56 and the second gear 57 mesh with each other, the pinch roller 40 is retracted, and the cam gear 45 is rotated, so that the cam gear 45 rotates. Groove 45a and pinch crimp cam pin 60
The pinch roller pressure bonding gear lever 52 is rotated in the counterclockwise direction via, and the pinch roller pressure bonding arm 55 is rotated in the direction of arrow F via the first gear 56 and the second gear 57. After the first gear 56 is disengaged from the second gear 57, the cam gear 45 is further rotated, whereby the pinch roller crimping gear lever 52 is rotated and the crimping portion 59 is moved to the crimping roller.
When the pinch roller crimping arm 55 is further rotated in the direction of arrow F, the pinch roller 40 brings the magnetic tape 32 into contact with the capstan 39, and the crimping roller 58 crimps it by a reaction force. The pinch roller crimping gear lever 52 is pushed down via the portion 59, and the holding arm 61 is rotated counterclockwise against the crimping spring 63. Therefore, the spring force of the crimp spring 63 is equal to the holding arm 61.
Is transmitted from the pinch roller pressure bonding gear lever 52, the pressure bonding portion 59, the pressure bonding roller 58, and the pinch roller pressure bonding arm 55 to the pinch roller 40, and acts as the pressing force of the pinch roller 40.

Here, in order to transmit the pressing force of the pinch roller 40 from the pressure bonding portion 59 to the pressure bonding roller 58, as shown in FIG. 2, the contact point between the center of the pressure bonding roller 58 and the pressure bonding roller 48 and the pressure bonding portion. The first line segment L1 that connects to and the rotation center of the contact point and the pinch roller pressure bonding gear lever 52 (rotation shaft 52a)
It is also clear from the drawings that the angle α formed by the second line segment L2 that connects to and is in the range of 90 ° to 180 °.

The operation of the magnetic recording / reproducing apparatus configured as above will be described.

First, in FIG. 1, the cassette 31 is attached to the apparatus,
When the recording or reproduction mode is switched, the loading motor 42 rotates and the cam gear 45 starts rotating counterclockwise. The rotation of the cam gear 45 causes the sector groove 46 to rotate counterclockwise by the cam groove 45b that drives the tape loading mechanism formed on the back surface of the cam gear 45, and engages with the first loading arm gear 48 and the second loading arm gear 48. By rotating the arm gear 50, the first post base 37 and the second post base 38 pull out the magnetic tape 32 from the opening in the cassette 31,
A predetermined amount is wound around the rotating cylinder 33. In addition, tension regulator post 41 and tape guide post 35c
Also, by a mechanism (not shown), it is moved from the inside of the opening of the cassette 31 to the outside of the cassette 31 in synchronization with the rotation of the sector gear 36.

Next, the pinch roller pressure bonding operation will be described with reference to FIGS. 2 and 3.

FIG. 3 shows the state of the pinch roller crimping mechanism when the cassette 31 is mounted on the apparatus and the cam gear 45 starts rotating counterclockwise. The pinch roller 40 is housed in the opening of the cassette 31, and at this time, the second gear 57 (having two teeth) formed on the pinch roller pressure bonding gear lever 52 and the first gear formed on the pinch roller pressure bonding arm 55. The gear 56 (having three teeth) is in mesh with each other.
From this state, the cam gear 45 continues to rotate, and the pinch roller crimping gear lever 52 rotates about its rotating shaft 52a by the cam groove 45a formed on the surface of the cam gear 45 and driving the pinch roller crimping mechanism. Correspondingly, the pinch roller crimping arm 55 pivots largely in the direction of arrow F by the action of the first gear 56 and the second gear 57, and the pinch roller 40 moves close to the capstan 39. After that, the first gear 56 and the second gear 57 are disengaged from each other. After that, the cam gear 45 continues to rotate, and as shown in FIG. 2, the magnetic tape 32 is pinched by the crimp portion 59 formed on the pinch roller crimp gear lever 52 and the crimp roller 58 provided on the pinch roller crimp arm 55. Crimp between 40 and capstan 39. At this time, the pinch roller crimping gear lever 52 is slightly returned to the left, and as a result, the holding arm 61 holding the pinch roller crimping gear lever 52 pivots slightly counterclockwise about the pivot shaft 62. As a result, the crimp spring 63 is stretched,
This will generate a crimping force.

In FIG. 2, a toggle mechanism is formed by the crimping portion 59, the crimping roller 58, and the pivot shaft 52a of the pinch roller crimping gear lever 52, and the necessary rotation torque of the cam gear 45 or the loading motor 42 at the time of crimping the pinch roller is formed. Is configured so that it can be set less.

As described above, according to this embodiment, the pinch roller 40 is rotatably attached to form the first gear 56, and the pinch roller crimping arm 55 and the second gear 57 that intermittently meshes with the first gear 56. Having the first gear 56 and the second gear 57
By disposing the pinch roller crimping gear lever 52 having the crimping portion 57 that acts on the pinch roller crimping arm 55 and gives a crimping force after the disengagement of the pinch roller crimping arm 55, the pinch crimping mechanism can be greatly simplified.

EFFECTS OF THE INVENTION As described above, according to the present invention, a cam, a pinch roller pressure bonding gear lever rotated by the cam, and a pinch roller rotating by the pinch roller pressure bonding gear lever via the first and second intermittent gears. With the crimping arm, the pinch roller with a large movement can be pulled out, and with the holding lever and the crimping spring, the pinch roller can be pressed with the pressing force via the above-mentioned members. It is possible to simultaneously realize a mechanism that pulls out the roller crimping arm larger than the inside of the cassette opening and a mechanism that tries to obtain a strong crimping force with a light driving force, which greatly simplifies the magnetic tape crimping mechanism and makes it compact and lightweight. And cost reduction can be realized.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
The figure is a plan view of the magnetic recording / reproducing apparatus, FIG. 2 is an enlarged plan view of an essential part showing the state of the pinch roller crimping mechanism at the time of crimping the pinch roller, and FIG. 3 is the pinch roller of the pinch roller crimping mechanism housed in a cassette. FIG. 4 to FIG. 6 show a conventional example, FIG. 4 shows a plan view of a magnetic recording / reproducing apparatus, and FIG. 5 shows a pinch roller of a pinch roller crimping mechanism housed in a cassette. FIG. 6 is an enlarged plan view of an essential part showing a state in which the pinch roller pressure bonding mechanism is pressed, and FIG. 31 …… Cassette, 32 …… Magnetic tape, 39 …… Capstan, 40 …… Pinch roller, 45 …… Cam gear, 45a ……
Cam groove (cam), 52 …… Pinch roller crimping gear lever, 52a …… Rotating shaft, 53 …… Board, 54 …… Rotating spindle, 55
...... Pinch roller crimping arm, 56 …… First gear (first intermittent gear), 57 …… Second gear (first intermittent gear), 58 …… Crimping roller, 59 …… Crimping section, 60 ...... Pinch crimp cam pin, 61 …… Holding arm, 62 …… Rotary axis, 63
...... Crimping spring.

Claims (1)

[Claims] 1. A capstan that rotates at a predetermined speed, a pinch roller that presses the capstan and transports a magnetic tape, and a rotation that holds the pinch roller at one end rotatably and stands on a substrate. A pinch roller crimping arm having a bearing portion rotatably held on a support shaft, a first intermittent gear formed on the outer periphery of the bearing portion, and a rotatably provided at the other end of the pinch roller crimping arm. A pressure roller, a holding arm rotatably attached to a rotating shaft set up on the substrate, a holding arm supported at one end of the holding arm via a rotating shaft, and a first arm when the pinch roller is pulled out. A pinch roller crimping gear lever having a second intermittent gear that meshes with the intermittent gear; and a pinch roller crimping gear lever provided on the pinch roller crimping gear lever A crimping portion that comes into contact with the crimping roller, a stopper pin that regulates the holding arm and regulates the amount of movement of the pinch roller crimping gear lever via the rotation shaft, and a biasing force that rotates in a direction in which the holding arm comes into contact with the stopper pin. And a cam for rotating the pinch roller crimping gear by a cam groove through a pinch crimping cam pin provided at the other end of the pinch roller crimping gear lever, and the pinch roller and the capstan are separated from each other. When the first intermittent gear and the second intermittent gear are in mesh with each other, the pinch roller pressure gear lever is rotated by the cam when the pinch roller is pulled out, and the pinch roller approaches the capstan at a predetermined position. And then the first intermittent gear and the second intermittent gear disengage from each other and And the crimping portion come into contact with each other, and the pinch roller crimping gear lever is pushed through the crimping portion by this contacting, whereby the holding arm is rotated and separated from the stopper pin, and the spring force of the crimping spring causes the holding arm to move. From the pinch roller crimping gear lever, the crimping section, the crimping roller, and the pinch roller crimping arm to the pinch roller to generate a pressing force of the pinch roller to the capstan. .