JPH09180304A - Magnetic recording / reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording and reproducing device equipped with a pinch roller presssing device which is low in cost and has a constitution of a small number of parts and without receiving an excessive load. SOLUTION: A bent part the tip of which is bent at an approximately right angle and which enters a cam groove 43b of a cam member 43 is provided on a 2nd end part 40c of a torsion coil spring 40. By directly driving the bent part of the torsion coil spring 40 by the cam groove 43b, a roller supporting member 39 is turned integrally with the torsion coil spring 40, so that a pinch roller 36 can be pressed against a capstan 35, thus constituting the device having a simple structure and without receiving an excessive load.

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 pressure bonding mechanism.

[0002]

2. Description of the Related Art There are various pinch crimping mechanisms used in a magnetic recording / reproducing apparatus, but the simplest one is the pinch roller pressure welding apparatus disclosed in Japanese Patent Laid-Open No. 63-136346, which is shown in FIG. explain. In FIG. 7, the capstan housing 6 and the pinch roller arm 9 are provided with a torsion coil spring 12 for urging the capstan 8 and the pinch roller 11 so as to always be in pressure contact with each other. 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 has a pin 10
And is rotatably supported with respect to the chassis 1. The ends 12b and 12c on both sides are coil portions 12a.
Of the pinch roller 1 extends from the upper and lower parts in a cross shape, and one end of the pin 12 engages the end 12b with the outer periphery of the capstan housing 6, while the other end of the pinch roller 1 moves the end 12c.
Reference numeral 1 denotes a pinch roller arm 9 pivotally supported on the edge of the take-up reel base 3. Also, the cam 14,
The cam lever 13 swings the pinch roller arm 9 toward the take-up reel stand 3 side 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, the recording / reproducing mode in which the pinch roller 11 and the capstan 8 are pressed against each other will be described. Since the cam 14 and the cam lever 13 are at the positions shown by the wavy line in FIG. 7, the biasing force of the torsion coil spring 12 is transmitted to the pinch roller arm 9 and the pinch roller 11 via the end 12c thereof, and cooperates with the capstan 8. The tape 16 can be driven to drive at a predetermined speed.

Next, the high speed fast forward / rewind mode will be described. Generally, in the high-speed fast-forward / rewind mode, the tape is run at high speed, so that the tape is not pressure-bonded between the capstan 8 and the pinch roller 11, and the take-up reel stand 3 or the supply reel stand 4 directly To drive. At this time, the cam 14 and the cam lever 13 become like the two-dot chain line shown in FIG. That is, the pinch roller 11 is moved away from the capstan 8 against the biasing force of the torsion coil spring 12, and the tape 16 is directly driven by the take-up reel base 3 or the supply reel base 4.

[0005]

Here, in general, VT
In a magnetic recording / reproducing apparatus such as R, if the force for pressing the pinch roller to the capstan is small, the tape running becomes unstable and wow and flutter are affected. Therefore, the force of pressing the pinch roller to the capstan is large. It is set. For this reason, the load current of the motor that drives the mechanism of the apparatus is the maximum load when the pinch roller is pressed, and it is a major point that this maximum load can be accommodated when selecting the motor.

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

An object of the present invention is to solve the above-mentioned problems of the prior art. To prevent the driving member (cam, cam lever, etc.) from being overloaded, the pinch roller is moved away from the capstan. The present invention provides a pinch crimping device and a driving member for the pinch crimping device that do not apply a load more than during crimping, and thereby an inexpensive magnetic recording / reproducing device can be realized.

[0008]

In order to achieve this object, a magnetic recording / reproducing apparatus of the present invention is capable of rotating integrally with a roller supporting member and has a first end locked to the roller supporting member. And a roller support member, and a torsion coil spring having a second end portion provided with a bent portion bent substantially at a right angle to a surface on which the roller support member moves, and engaging the bent portion of the torsion coil spring to support the roller. When the member and the torsion coil spring are selectively moved between the first position and the second position, and the pinch roller is at the second position, the second end of the torsion coil spring and the roller supporting member are unlocked. , A cam member provided with a groove cam for further rotating the second end of the torsion coil spring in the direction in which the pinch roller is pressed against the capstan.

With this configuration, it is possible to provide a pinch crimping device having a small number of parts and not requiring a large force when the pinch roller and the capstan are separated from each other.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention rotatably supports a forward / reverse capstan and a pinch roller so that the capstan and the pinch roller do not come into contact with each other. A roller support member capable of moving the pinch roller to a position and a second position where the capstan and the pinch roller come into contact with each other, and the roller support member is rotatable integrally with the roller support member. A torsion coil spring having a stopped first end and a second end provided with a bent portion that is engaged with the roller support member and is bent substantially at a right angle to a surface on which the roller support member moves; The roller support member and the torsion coil spring are selectively moved between the first position and the second position by engaging with the bent portion, and the pinch roller is located at the second position. At this time, a groove cam that unlocks the second end of the torsion coil spring and the roller support member and further moves the second end of the torsion coil spring in the direction in which the pinch roller presses the capstan. The magnetic recording / reproducing apparatus is characterized by having a cam member provided, and a pinch crimping device having a small number of parts can be used to separate the pinch roller from the capstan with a weak force.

(Embodiment 1) FIG. 1 is a plan view of an essential part of a magnetic recording / reproducing apparatus of the present invention. In FIG.
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 by the pinch roller 36 at a predetermined speed, and wound on the take-up reel 37. 2 is a plan view of a pinch crimping portion of the magnetic recording / reproducing apparatus of the present invention, FIG. 3 is a sectional view of the same main portion, and FIG. 4 is a partial explanatory view thereof. 2, FIG. 3, and FIG. 4, the pinch roller 36 is rotatable around a support shaft 38, and the roller support member 39 is a support shaft 3.
8 is mounted and bent in a U-shape, and a through hole 39a is provided at substantially the center thereof. In addition, the roller support member 3
9, a first locking portion 39b, a second locking portion 39c, and a restricting portion 39d that restricts a coil portion 40a of a torsion coil spring 40 described later are provided at predetermined positions. The torsion coil spring 40 is a coil portion 40 in which a spring material is wound.
a, a first end portion 40b, and a second end portion 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 so 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 is rotated by the force of the cam groove 43b, it can be rotated around the rotation center of the roller support member 39, and the biasing force transmitted from the torsion coil spring 40 to the pinch roller 36, and thus the pinch roller. The crimping force for crimping 36 onto the capstan 35 can be accurately set to a predetermined value.
The first end portion 40b is the first locking portion 39 of the roller support member 39.
The second end 40c is locked not only by the second locking part 39c of the roller support member 39 but also by bending the tip at a substantially right angle, which will be described later. The cam member 43 has a bent portion 40d inclined by 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 portion, and FIG. 6A is a cross-sectional view of the main part as seen from the direction of arrow A in FIG. Since the torsion coil spring 40 is incorporated in the roller supporting member 39 in a state in which the biasing force is charged, the roller supporting member 39 and the torsion coil spring 40 are integrally rotatable with respect to the support shaft 42. There is. The cam member 43 is rotatable around the support shaft 41, and the torsion coil spring 4 is provided on the upper end surface 43a thereof.
A groove cam 43b into which the bent portion 40d of the second end portion 40c of 0 is fitted is provided. The groove width of the groove cam 43b is
The inclined bent portion 40d is designed to be able to enter smoothly, and the pinch roller 36 and the capstan 35 are in contact with each other from the first position (FIG. 2A) to the second position (FIG. 2B). Not only the roller support member 39 and the torsion coil spring 40 are integrally rotated, but also after the pinch roller 36 and the capstan 35 come into contact with each other, the second end portion 4
0c and the second locking portion 39c of the roller support member 39 are released, and the pinch roller 36 is further moved to the capstan 35
The second end 40 of the coil spring 40, which is twisted in the direction of crimping to
c is moved (FIG. 2 (c)).

The operation of the magnetic recording / reproducing apparatus configured as described above will be described. First, the 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 in 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 supporting member 39. Therefore, the biasing force of the torsion coil spring 40 is transmitted from the first end portion 40b to the first locking portion 39b of the roller support member 39, and the pinch roller 36 is pressed against 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 about its axis and, as shown in FIG.
d and the groove cam surface 43c are in line contact with each other. 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 / reproduction can be performed.

Next, the high speed fast forward / rewind mode will be described. When shifting from the recording / reproducing 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 portion 40c moves according to the groove cam 43b. The second end 40c and the second of the roller support member 39
After the locking portion 39c has abutted, the roller support member 39 and the torsion coil spring 40 move integrally, and the pinch roller 3
At the second position where 6 is away from the capstan 35, the transition to the high speed fast forward / rewind mode is completed.

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 because all the urging force of the torsion coil spring 40 is applied during the recording / reproducing mode (when the pinch roller 36 is pressed against the capstan 35), and at other times. The biasing force of the torsion coil spring 40 causes the first locking portion 3 of the roller support member 39 to move.
Since it is restricted by 9b and the second locking portion 39c, it is hardly added. In addition, the second end 40c of the torsion coil spring 40
Since the bent portion 40d of 4 is twisted by a predetermined angle in advance, the bent portion 4d is in the recording / reproducing mode.
0d and the contact area of the groove cam surface 43c of the cam member 43 are increased, and the stress applied to the groove cam 43b is also reduced. Therefore, 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 portion that is rotatable integrally with the roller support member and that is locked to the roller support member and a second end portion that is locked to the roller support member and that has a bent portion that is bent at a substantially right angle are provided. The torsion coil spring and the bent portion of the torsion coil spring are engaged to selectively move the pinch roller and the torsion coil spring between the first position and the second position, and when the pinch roller is at the second position, the torsion coil spring is twisted. By providing a cam member provided with a groove cam for further rotating the second end of the coil spring in the direction in which the pinch roller and the capstan are crimped, a pinch crimping device can be constructed with a small number of parts, and a pinch crimping device can be constructed. Since a large force is not required when separating the roller and the capstan, a general cam member and a motor for driving the cam member can be used, 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 which is rotatable integrally with a roller supporting member, and is provided with a cam member which engages with a bent portion of the torsion coil spring. By controlling the torsion coil spring and rotating the torsion coil spring further in the crimping direction when the pinch roller is in the crimping position to the capstan, the pinch crimping device can be configured with a small number of parts, Moreover, a large force is not required when the pinch roller and the capstan are separated from each other, an inexpensive general-purpose product can be used for the cam member and its drive motor, and an extremely cost-effective magnetic recording / reproducing device can be provided. it can.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part of a magnetic recording / reproducing apparatus of the present invention.

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

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

FIG. 4 is an explanatory diagram of the same portion.

[FIG. 5] 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]

 30 tape 31 supply reel 32 FE head 33 rotating 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 restricting portion 39e connecting surface 40 Torsion coil spring 40a Coil portion 40b First end portion 40c Second end portion 40d Bent portion 43 Cam member 43a Upper end surface 43b Groove cam 43c Groove cam surface

Claims (3)

[Claims] 1. A forward / reverse capstan and a pinch roller are rotatably supported, and a first position at which the capstan and the pinch roller do not come into contact with each other and a first position at which the capstan and the pinch roller come into contact with each other. A roller support member capable of moving the pinch roller to two positions, a first end portion configured to be substantially integrated with the roller support member and locked to the roller support member, and a roller support member. And a torsion coil spring having a second end portion provided with a bent portion bent substantially at right angles to a surface on which the roller support member moves, and the roller support member and the torsion coil spring engaged with the bent portion of the torsion coil spring. Is selectively moved to the first position and the second position, and when the pinch roller is in the second position, the second end of the torsion coil spring and the front end of the torsion coil spring are moved. And a cam member provided with a groove cam for further unlocking the lock of the roller support member and further moving the second end portion of the torsion coil spring in the direction in which the pinch roller is pressed against the capstan. Magnetic recording / reproducing device. 2. The bending portion of the torsion coil spring is inclined in advance at a predetermined angle with respect to the groove cam surface so that the groove cam surface and the bending portion are in substantially line contact with each other during crimping operation. Item 1. The magnetic recording / reproducing apparatus according to item 1. 3. The roller support member pivotally moves between a first position and a second position, and regulates an outer diameter of the torsion coil spring so that a winding center and a rotation center of the torsion coil spring are substantially the same. The magnetic recording / reproducing apparatus according to claim 1, further comprising: