JP3136977B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a VTR, and more particularly to a magnetic recording / reproducing apparatus characterized by a pinch crimping mechanism.

[0002]

2. Description of the Related Art There are various types of pinch crimping mechanisms used in a magnetic recording / reproducing apparatus. The simplest one is a pinch roller pressing apparatus disclosed in Japanese Patent Application Laid-Open No. 63-136346 using FIG. explain. In FIG. 7, a torsion coil spring 12 is provided between the capstan housing 6 and the pinch roller arm 9 so as to urge the capstan 8 and the pinch roller 11 so as to always be in a pressure contact state. The torsion coil spring 12 includes a coil portion 12a around which a spring material is wound, and end portions 12b, 1 on both sides of the coil portion 12a.
2c. The coil portion 12a is a pin 10
And rotatably supported by the chassis 1. The ends 12b and 12c on both sides are the coil portions 12a.
Of the capstan housing 6 at one end, and the other end of the pinch roller 1 at the other end.
Reference numeral 1 denotes a pinch roller arm 9 which is pivotally supported by the pin and is locked to the edge of the take-up reel base 3. Also, cam 14,
The pinch roller arm 9 is swung toward the take-up reel base 3 by the cam lever 13 to separate the pinch roller 11 from the capstan 8.

The operation of the conventional example configured as described above will be described below. First, a recording / reproducing mode in which the pinch roller 11 and the capstan 8 are pressed against each other is described. Since the cam 14 and the cam lever 13 are at the positions shown by the dashed lines in FIG. 7, the urging force of the torsion coil spring 12 is transmitted to the pinch roller arm 9 and the pinch roller 11 via the end 12c, and cooperates with the capstan 8. Thus, the tape 16 can be driven at a predetermined speed.

Next, the high-speed fast-forward / rewind mode will be described. In general, in the high-speed fast-forward / rewind mode, the tape is run at a high speed. Therefore, the tape is not pressed between the capstan 8 and the pinch roller 11 but directly on the take-up reel table 3 or the supply reel table 4. Drive. At this time, the cam 14 and the cam lever 13 are as shown by a two-dot chain line in FIG. That is, the pinch roller 11 is separated from the capstan 8 against the urging force of the torsion coil spring 12, and the tape 16 is directly driven by the take-up reel table 3 or the supply reel table 4.

[0005]

Here, generally, VT
In a magnetic recording / reproducing device such as R, if the force for pressing the pinch roller to the capstan is small, the tape running becomes unstable, affecting wow and flutter, etc., the pressing force of the pinch roller to the capstan is large. It has been set. For this reason, the load current of the motor that drives the mechanism of the device is the largest when the pinch roller is pressed, and it is important that the maximum load can be handled when selecting the motor.

However, in the above-described conventional configuration, in the high-speed fast-forward / rewind mode, when the pinch roller 11 is separated from the capstan 8, the cam 14 and the cam lever 13 are opposed to the urging force of the strong torsion coil spring.
, A considerably large force is applied to the cam 14 and the cam lever 13. For this reason, the cam 14 and the cam lever 13 must be made of a special material having high rigidity and good wear characteristics, which causes an increase in cost. Also, since a larger load is applied than when pinch rollers are pressed, a motor that can withstand the larger load must be used.
It is very disadvantageous in terms of size and cost.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems. When an excessive load is not applied to a driving member (cam, cam lever, etc.), and a pinch roller is separated from a capstan, a pinch roller is used. The present invention provides a pinch crimping apparatus and a driving member for the pinch crimping apparatus to which a load greater than the pressure applied during crimping is applied, thereby realizing an inexpensive magnetic recording / reproducing apparatus.

[0008]

Means for Solving the Problems In order to achieve this object, a magnetic recording and reproducing apparatus of the present invention, a reversible cap
The stand and the pinch roller are rotatably supported, and the
A first position where the pusher and the pinch roller do not contact each other;
A second contact between the capstan and the pinch roller;
A roller support member movable to a position
A first end portion locked to the member and the roller support member;
Is stopped and folded substantially perpendicular to the surface on which the roller support member moves.
A second end provided with a bent portion;
An end and the second end are urged by the roller support member.
A torsion core substantially integrated with the support member
A magnetic recording and reproducing apparatus having
And the groove cam is provided with the torsion coil.
By engaging the bent portion of the spring, the roller support portion
Controls the position of the material and in the fast forward / rewind mode
The cam gear holds the roller support member in the first position.
The cam gear rotates in the recording / reproducing mode.
By moving the roller support member from the first position to the second
After moving to the position, the cam gear rotates further.
A second end of the torsion coil spring and the roller support;
Release the engagement of the holding member, and
The configuration is such that a crimping force is generated between the stans.

With this configuration, it is possible to provide a pinch crimping apparatus that requires a small number of parts and does not require a large force when separating the pinch roller and the capstan.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a capstan capable of rotating forward and backward and a pinch roller are rotated.
Freely supporting the capstan and the pinch roller
The capstan and the pinch are not in contact with each other.
Roller support movable to a second position where the roller abuts
A member, a first end locked to the roller support member,
The roller support member is locked to the roller support member,
A bent portion that is bent substantially at right angles to the moving surface
The first end and the second end have the two ends.
Roller support member and substantially integrated with the support member
Magnetic recording reproducing device having a torsion coil spring configured in a general manner
A raw device, comprising a cam gear provided with a grooved cam,
The groove cam engages the bent portion of the torsion coil spring
By controlling the position of the roller support member,
-In the rewind mode, the cam gear supports the roller.
Holding the member in the first position, and in the recording / reproducing mode,
The roller support member is moved forward by the rotation of the cam gear.
After moving from the first position to the second position, further forward
The rotation of the cam gear rotates the torsion coil spring.
The engagement between the second end and the roller support member is released, and the pin
Force between the roller and the capstan.
A magnetic recording / reproducing apparatus characterized in that it is a pinch crimping apparatus having a small number of parts and can separate the pinch roller and the capstan with a small force.

(Embodiment 1) FIG. 1 is a plan view of a main part of a magnetic recording and reproducing apparatus according to the present invention.
0 passes through the FE head 32, the rotary cylinder 33, and the AC head 34 from the supply reel 31, and the capstan 3
5. Driven at a predetermined speed by the pinch roller 36 and wound on the take-up reel 37. FIG. 2 is a plan view of a pinch crimping portion of the magnetic recording / reproducing apparatus of the present invention, FIG. 2, 3, and 4, the pinch roller 36 is rotatable about a support shaft 38, and the roller support member 39 is
8 is mounted and bent in a U-shape, and a through hole 39a is provided substantially at the center thereof. The roller support member 3
A predetermined locking portion 9 is provided with a first locking portion 39b, a second locking portion 39c, and a regulating portion 39d for regulating a coil portion 40a of the torsion coil spring 40 described later. The torsion coil spring 40 is a coil portion 40 around which a spring material is wound.
a, a first end 40b, and a second end 40c. The outer shape of the coil portion 40a is regulated by the regulating portion 39d of the roller supporting member 39 and the upper and lower connecting surfaces 39e such that the center thereof substantially coincides with the center of the through hole 39a provided in the roller supporting member 39 (FIG. 4). ). With this configuration, when the bent portion 40d rotates by receiving a force from the cam groove 43b, the bending portion 40d can rotate around the rotation center of the roller support member 39, and the urging force transmitted from the torsion coil spring 40 to the pinch roller 36, and thus the pinch roller The crimping force for crimping 36 to the capstan 35 can be accurately set to a predetermined value.
The first end portion 40b is connected to the first locking portion 39 of the roller support member 39.
b, the second end portion 40c is not only locked by the second locking portion 39c of the roller support member 39, but also has its tip bent at a substantially right angle, and will be described later. The cam member 43 has a bent portion 40d inclined at a predetermined angle in the direction of the support shaft 41. FIG. 5 is a plan view of a main part showing the direction of the bent part, and FIG. 6A is a cross-sectional view of the main part seen from the direction of arrow A in FIG. Since the torsion coil spring 40 is incorporated in the roller support member 39 in a state where the urging force is charged, the roller support member 39 and the torsion coil spring 40 are configured to be rotatable with respect to the support shaft 42 integrally. I have. The cam member 43 is rotatable about a support shaft 41, and has a torsion coil spring 4 on its upper end surface 43a.
There is provided a groove cam 43b into which the bent portion 40d of the second end portion 40c is fitted. The groove width of the groove cam 43b is
The inclined bent portion 40d can be easily inserted, and the second position (FIG. 2B) where the pinch roller 36 and the capstan 35 come into contact from the first position (FIG. 2A) where the capstan 35 does not abut. Not only does the roller support member 39 and the torsion coil spring 40 rotate integrally until the pinch roller 36 and the capstan 35 come into contact with each other until the second end 4
0c and the second locking portion 39c of the roller supporting member 39 are released, and the pinch roller 36 is further moved by the capstan 35.
The second end 40 of the torsion coil spring 40 in the direction of crimping
c is moved (FIG. 2C).

The operation of the magnetic recording / reproducing apparatus configured as described above will be described. First, a recording / reproducing mode in which the pinch roller 36 and the capstan 35 are pressed against each other will be described. The cam member 43 is at the position shown in FIG.
The second end 40c of the torsion coil spring 40 is separated from the second locking portion 39c of the roller support member 39. Therefore, the biasing force of the torsion coil spring 40 is transmitted from the first end 40b to the first locking portion 39b of the roller support member 39, and presses the pinch roller 36 to the capstan 35 with a predetermined force. At this time, since the bent portion 40d of the second end portion 40c receives a force as a reaction from the groove cam 43b, the bent portion 40d is twisted around its axis, and as shown in FIG.
d and the groove cam surface 43c are in line contact. Since the capstan 35 is driven at a predetermined rotation speed by another driving means (not shown), the tape 30 can run at a predetermined speed, and recording and reproduction can be performed.

Next, the high-speed fast-forward / rewind mode will be described. When shifting from the recording / reproduction mode to the high-speed fast-forward / rewind mode, the cam member 43 rotates counterclockwise in FIG. Then, the second of the torsion coil spring 40
The bent portion 40d of the end 40c moves according to the groove cam 43b. The second end portion 40c and the second
After the engaging portion 39c abuts, the roller supporting member 39 and the torsion coil spring 40 move integrally, and the pinch roller 3
The transition to the high-speed fast-forward / rewind mode is completed at the second position 6 away from the capstan 35.

In this state, the take-up reel 37 or the supply reel 31 is driven by another driving means (not shown), and the tape 30 can run at high speed.

The external force applied to the cam member 43 is maximized in the recording / reproducing mode (when the pinch roller 36 is pressed against the capstan 35) because all the urging force of the torsion coil spring 40 is applied. The biasing force of the torsion coil spring 40 is applied to the first locking portion 3 of the roller support member 39.
9b, it is hardly added because it is regulated by the second locking portion 39c. Also, the second end 40c of the torsion coil spring 40
Since the bent portion 40d is twisted by a predetermined angle in advance, the bent portion 4d is not used in the recording / reproducing mode.
The contact area between Od and the groove cam surface 43c of the cam member 43 is increased, and the stress applied to the groove cam 43b is also reduced. For this reason, a general resin material is used as the material of the cam member 43.

As described above, according to the present embodiment, in order to achieve this object, the magnetic recording / reproducing apparatus of the present invention comprises:
A first end that is rotatable integrally with the roller support member and is locked by the roller support member and a second end portion that is locked by the roller support member and has a bent portion that is bent at substantially a right angle. The pinch roller and the torsion coil spring are selectively moved to a first position and a second position, and when the pinch roller is at the second position, the torsion coil spring is engaged. By providing a cam member provided with a grooved cam for further rotating the second end of the coil spring in the direction in which the pinch roller and the capstan press against each other, a pinch crimping device can be configured with a small number of parts. Since a large force is not required when separating the roller and the capstan, the cam member and the motor for driving the cam member can use general ones, which is extremely cost-effective. It is possible to provide a gas-recording and reproducing apparatus.

[0017]

As described above, the present invention has a torsion coil spring rotatable integrally with a roller supporting member, a cam member which engages a bent portion of the torsion coil spring, and a pinch roller and a pinch roller are provided by the cam member. When the torsion coil spring is controlled, and the pinch roller is at the position of crimping to the capstan, the torsion coil spring is further rotated in the direction of crimping, so that a pinch crimping device can be configured with a small number of parts, In addition, it is possible to provide a magnetic recording / reproducing apparatus which does not require a large force when separating the pinch roller and the capstan, and which can use inexpensive general-purpose products for the cam member and its driving motor, and which is extremely excellent in cost. it can.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a plan view of a main part of the pinch portion.

FIG. 3 is a sectional view of a main part of the same.

FIG. 4 is a partial explanatory view of the same.

FIG. 5 is an enlarged view of the main part.

FIG. 6 is a sectional view of the main part.

FIG. 7 is a plan view of a main part of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 30 tape 31 supply reel 32 FE head 33 rotary cylinder 34 AC head 35 capstan 36 pinch roller 37 take-up reel 39 roller support member 39a through hole 39b first locking portion 39c second locking portion 39d regulating portion 39e connecting surface 40 Torsion coil spring 40a Coil portion 40b First end portion 40c Second end portion 40d Bending portion 43 Cam member 43a Upper end surface 43b Groove cam 43c Groove cam surface

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-26145 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 15/29

Claims (3)

(57) [Claims] 1. A capstan capable of rotating forward and backward, and a pinch roller rotatably supported.
A first position where the pinch roller does not come into contact with the first position;
Move to the second position where the stun and the pinch roller abut.
A movable roller supporting member, a first end locked to the roller supporting member,
The roller support member is moved by being locked by the roller support member.
The second end provided with a bent portion bent substantially perpendicular to the surface
Wherein the first end and the second end are supported by the roller.
Constructed substantially integrally with the support member while being urged by the member
Magnetic recording / reproducing device with a torsion coil spring
And a cam gear provided with a groove cam , wherein the groove cam is engaged with a bent portion of the torsion coil spring.
By controlling the position of the roller support member, the cam gear is in the high-speed fast-forward / rewind mode.
By holding the roller support member at the first position, the cam gear rotates during the recording / reproduction mode.
Moving the roller support member from the first position to the second position;
By further rotating the cam gear after moving in,
A second end of the torsion coil spring and the roller support member
Of the pinch roller and the capstan
A magnetic recording medium characterized in that a pressure force is generated between them.
Raw equipment. 2. The bending portion of the torsion coil spring is tilted at a predetermined angle with respect to the groove cam surface so that the groove cam surface and the bending portion are substantially in line contact during the pressing operation. 2. The magnetic recording and reproducing apparatus according to 1. 3. A restricting portion for rotating the roller support member between a first position and a second position, and restricting an outer diameter of the torsion coil spring so that a winding center and a rotation center of the torsion coil spring become substantially the same. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising: