JPH03189953A - Cam mechanism for magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cam mechanism for a magnetic recording/reproducing device that has a double chassis structure and uses a so-called slide chassis system in which the upper chassis moves during loading and unloading.

[Conventional technology]

Conventionally, in order to reduce the size of the device, magnetic recording and reproducing devices such as 8mm VTRs have a double chassis structure, and when loading is complete, the tape runs with the cassette opening and cylinder folded flat. There is a so-called sliding chassis type device, but since the members and protrusions on the moving chassis occupy the space within the moving range, it was necessary to configure the device so that there would be no interference between the members. Note that this type of device is, for example, disclosed in Japanese Patent Application Laid-Open No. 1-1586.
There is a publication No. 59.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, in order to secure the space occupied by the moving members and protrusions on the moving chassis, it is necessary to avoid interference between the members, which imposes many design restrictions and hinders further miniaturization of the device. It became.

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned prior art, and to
The object of the present invention is to realize a cam mechanism compatible with a thin magnetic recording/reproducing device.

[Failure to solve the problem]

In order to achieve the above object, the present invention provides a magnetic recording and reproducing device using a slide chassis system, in which, in an unloading state, a driving member provided on a first chassis,
Interference with members or protrusions provided on the moving second chassis (overlap in both plane and height directions)
A spring member is provided at the part where the driving member interferes, and the spring member bends and escapes in the interference state.

When the second chassis moves forward due to the loading operation, the spring member returns to the predetermined position by its own elasticity.
The structure is configured to guide the rotation of the driven member.

Further, the driving member is configured to engage with a cam portion of a cam gear and to be operated by rotation of the cam gear.

[Effect]

In the unloading state, the member or protrusion provided on the second chassis that was interfering with (contacting) the spring member of the drive member moves forward together with the second chassis due to the loading operation, and the spring member of the drive member moves forward together with the second chassis. The retracted/displaced state of the member is released. In accordance with this, the spring member is restored and displaced by its own elasticity to a desired position where it can engage and guide the driven member, and the driving member is also brought into a state in which it can operate. By doing this, even if there is a portion that overlaps (interferes with) the driving member in the space occupied by the moving members and protrusions on the moving second chassis, there will be no problem in the operation of the device. This makes it possible to achieve smaller size and thinner profile.

Furthermore, the state of engagement between the guide surface of the spring member and the driven member is changed in stages by a cam of a cam gear that rotates due to loading, and the slip angle when the guide surface of the spring member and the driven member come into contact with each other is adjusted. Since it is made smaller and has better sliding, it ensures reliable operation and increases the degree of freedom in the arrangement and shape of the spring member on the drive member in the unloading state. A degree of freedom is obtained in the arrangement of the members or protrusions provided above, and further miniaturization and thinning of the device can be achieved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the main mechanism of the first chassis 1 in an unloading dust state. As shown in the figure, a capstan motor 2 is mounted on the first chassis 1, and a guide base 11 is mounted on the upper part of the capstan motor 2. 12 is a gear, and 7 is a cam gear, which are each rotatably mounted on the first chassis 1.

The driving force of a loading motor (not shown) is transmitted to the gear 12 via a reduction mechanism, and further transmitted to the cam gear 7.

The operating arm 5, which is rotatably mounted on the first chassis 1 about the rotation center 5a, is provided with an operating arm pin 5b that engages with the cam groove 7a of the cam gear 7. The operation arm 5 is rotated and displaced by the movement. A leaf spring 9 is attached to the operating arm 5 and is configured to operate integrally with the operating arm 5. Leaf spring 9
is equipped with an arm portion 9a that functions as a guide surface for rotation of the pinch roller arm, which will be described later. This arm portion 9a has a spring property, and in the unloading dust tube state, the arm portion 9a comes into contact with the exit side guide bearing 4b provided on the second chassis 4 that can move forward and backward, and the arm portion 9a It is bent and escaped (arm part 9
(a is in the retracted position, which is not the original guiding position). In addition,
Reference numeral 10 denotes a drawer guide, which is attached to the first chassis 1''2 and is used for loading the outlet guide 6 (Fig. 3),
It functions to guide the unloading operation.

FIG. 2 is a side view of the main part in the unloading stop state. In this unloading dust block state, the above-mentioned outlet guide bearing 4b and the arm part 9a are in contact with each other, and as mentioned above, the arm part 9a is It is in a state of bending and running away. As shown in the figure, the exit guide arm 6a is
Its shaft portion is pivotally supported by the exit guide bearing 4b, rotatably attached to the second chassis 4F with a washer 13, and biased in the direction of arrow C in FIG. 3 by a biasing torsion spring 14. There is. Further, the pinch roller arm 8C rotatably mounted on the second chassis 4 is provided with an operating pin 8a, and the operating pin 8a is configured to come into contact with the arm portion 9a during loading. There is.

FIG. 3 is a plan view showing the main mechanism of the second chassis 4 in an unloading state.

As shown in the figure, the second chassis 4 is attached to the first chassis 1 so as to be slidable back and forth (in the direction of arrow C in FIG. 3) along a guide hole 4a. The pinch roller 8 is rotatably mounted on the pinch roller arm 8C, and the pinch roller arm 8c has a rotation center 8b.
It is mounted on the second chassis 1 so as to be rotatable about the center, and receives a biasing force from a biasing spring 15 in the direction of arrow C in FIG. Similarly, the exit guide 6 is mounted on the exit guide arm 6a, and the exit guide arm 6a is rotatably mounted on the second chassis 4 as described above.

FIG. 4 shows a plan view of the main parts in the loading stop state. In the state shown in the fourth figure, the second chassis 4 (not shown in this figure) has completed its movement (advancement) along with the loading operation. Now, when the second chassis 4 starts to move forward during the loading operation, the exit side guide bearing 4b moves with the movement, and the arm portion 9
a is released, the arm portion 9a restores and is displaced to the original guide position by its own elasticity, and its free end comes into contact with the bent portion 5C of the operating arm 5. Further, as the second chassis 4 moves forward, the pinch roller arm 8C also moves forward, and as a result, the operating pin 8a of the pinch roller arm 8c comes into contact with and is guided by the arm portion 9a, and as the pinch roller arm 8C moves forward, the pinch roller arm 8C moves forward. Rotate in the direction of the arrow in Figure 4 and pull out the pinch roller 8.

At this time, the arm portion 9a receives force due to the contact of the operating pin 8a, but since the bent portion 5c of the operating arm 5 and the free end of the arm portion 9a are in contact with each other, the bent portion 5c receives the force. The arm portion 9a will not be deformed. Furthermore, at the final displacement completion position of the pinch roller arms 1, 8c corresponding to the forward movement completion position of the second chassis 4, that is, during the pinch roller crimping operation, the operation pin 8a is directly moved at the bending part 5C via the arm part 9a. It is configured to press.

In addition, as the second chassis 4 moves forward, the guide pin provided on the outlet guide arm 6a comes into contact with the drawer guide 10 and the guide base and is guided to rotate the outlet guide arm 1.6a to a predetermined position.・Displaced.

Further, the cam gear 7 is also rotating during the loading operation, and accordingly, the operating arm 5 is also operated by the operating arm pin 5b engaged with the cam groove 7a, thereby changing the inclination of the arm portion 9a and guiding the abutment. It is controlled so that the time slippage is in good condition.

FIG. 5 shows a plan view of the main parts during loading, showing an arm portion (guide surface portion) 9a of the leaf spring 9 that operates integrally with the operating arm 5, and an operating pin 8a provided on the pinch roller arm 8C. The figure shows how the pinch roller arm 8c is guided by the arm portion 9a, moves forward and rotates, and the pinch roller 8 is pulled out.

At this time, the smaller the slip angle θ shown in the figure, the smoother the operation. For this reason, in this embodiment, the amount of rotation of the operating arm 5 by the cam gear 7, that is, the inclination of the arm portion 9a serving as the guide surface, is controlled in stages so that the slip angle θ is always below a predetermined value. There is.

FIG. 6 is a side view of the main part of the conventional example, in which the exit guide bearing 4b provided on the second chassis 4 and the operating arm 5' overlap each other in the height direction. The arrangement is such that there is no interference. Therefore, the distance l' between the first chassis 1 and the second chassis 4 becomes larger.

As can be seen by comparing FIG. 2 (embodiment of the present invention) and FIG. 5 (conventional example), in this embodiment, the outlet guide pin 4b and the leaf spring 9 of the operating arm 5 are in the unloading state. In this case, since overlapping (interference) can be allowed both in the plane and in the height direction, the distance between the first chassis 1 and the second chassis 4 can be made small. On the other hand, in order to avoid the interference of the part H, in the conventional example, β' becomes large, making it difficult to make the device thin. 5, it is possible to further reduce the thickness of the device. Furthermore, when the operating pin 8a is brought into contact with and guided by the arm portion 9a, reliable operation can be achieved by controlling the contact guide angle (sliding angle 1 θ).

〔Effect of the invention〕

As described above, according to the present invention, by providing the spring member on the driving member on the first chassis side, the member provided on the moving second chassis or the protrusion of the second chassis and the spring member (a part of the drive member) can be arranged in such a way that they can interfere with the operation of the mechanism without any problem, which has a great effect on making the device smaller and thinner.

Furthermore, by controlling the cam gear, the angle at which the guide surface portion of the spring member is brought into contact and guided can be changed, so that more stable movement can be achieved in terms of operation.

[Brief explanation of drawings]

1 to 5 relate to one embodiment of the present invention, FIG. 1 is a plan view showing the main mechanism on the first chassis side in the unloading dust block state, and FIG. 2 is in the unloading stop state. 3 is a plan view showing the main mechanism on the second chassis side in the unloading/dust stop state; FIG. 4 is a plan view without showing the main mechanism in the loading stop state. , FIG. 5 is a plan view of the main part in the middle of loading, and FIG. 6 is a sectional side view of the main part in the unloading stopped state in the conventional example. 1......First chassis, 4......
...Second chassis, 4b... Exit guide bearing, 5... Operation arm, 5c...
・・・・・・Bending part, 6・・・・・・Exit guide, 6a・・・・・・・・・Exit guide arm, 7
......Cam gear, 8...Pinch roller, 8a...Kawaffl production hint, 8C...
...Pinch roller arm, 9...old...
Leaf spring, 9a...Arm part.

Claims (1)

[Claims] 1. A cam gear is rotationally driven by a loading motor via a reduction mechanism, and a mechanism engaged with the cam gear loads and unloads the tape, and at that time, the second chassis A magnetic recording/reproducing device in which a drive member is provided on the first chassis and is cam-engaged with the cam gear, and a drive member is provided on the second chassis and moves backward and forward relative to a first chassis. a driven member that is guided and regulated by a guide surface of the member and rotates when the second chassis advances or retreats; and an elastic member that is a part of the driving member and has the guide surface that guides and controls the rotation of the driven member. and a displaceable spring member, and in the unloading state, the member provided on the second chassis or the protrusion of the second chassis flexes the guide surface portion of the spring member, and the guide surface portion is placed in the retracted position, and the spring member is released from contact and lock by the member provided on the second chassis or the protrusion of the second chassis by moving the second chassis forward through a loading operation. The guide surface portion of the spring member is displaced to a predetermined guide position, and the driven member, which moves forward as the second chassis moves forward, moves the guide surface portion of the spring member that has been displaced to the predetermined guide position. A cam mechanism for a magnetic recording/reproducing device, characterized in that the cam mechanism is guided and regulated by a portion and rotates by a predetermined amount. 2. In claim 1, in order to improve the slippage when the driven member and the guide surface of the spring member are in contact with each other and the driven member is rotated and guided, the driving member is moved by the cam gear. A cam mechanism for a magnetic recording and reproducing device, characterized in that the angle of the guide surface is changed by rotational displacement, and the driven member is guided while keeping a sliding angle below a predetermined value. 3. In claim 1, the free end of the cam surface portion of the spring member that is brought into contact with and unlocked by the member provided on the second chassis or the protrusion of the second chassis is connected to the drive member. At the displacement position of the driven member, which is locked to the protrusion of the member and corresponds to the final position when the second chassis moves forward, the protrusion of the drive member moves through the cam surface portion of the spring member to the driven member. A cam mechanism for a magnetic recording/reproducing device, characterized in that the cam mechanism is brought into contact with the cam mechanism.