KR100214870B1 - Pinch roller driving device for magnetic recording and reproducing device - Google Patents

Abstract

The present invention relates to an apparatus for closely contacting a pinch roller to a capstan shaft side in order to apply a running force of a tape in a magnetic recording and reproducing apparatus.

An apparatus according to the present invention includes a capstan shaft for applying driving force in contact with a tape, a pinch roller closely attached to the capstan shaft with a tape therebetween, and an integrated post and a pinch roller for rotatably supporting the pinch roller And a pinch roller driving means for driving the pinch roller supporting means to the capstan shaft side by engaging with an elastic member of the pinch roller supporting means. The elastic member of the pinch roller supporting means comprises an elastic arm having one end inserted into the fixing hole of the supporting means and a leaf spring having a projection projecting downward from the other end of the elastic arm, So that the pinch rollers can be firmly supported on the capstan shaft side by the elasticity of the leaf springs while being moved toward the capstan shaft.

Description

A pinch roller driving device of a magnetic recording and reproducing device

FIG. 1 is an exploded cross-sectional view of a conventional pinch roller driving device. FIG.

Fig. 2 shows a state before the conventional pinch roller is squeezed. Fig. 2 (a) is a front view, and Fig. 2 (b) is a plan view.

Fig. 3 shows a state where a conventional pinch roller is squeezed, wherein a is a front view, and b is a top view.

FIG. 4 is an exploded cross-sectional view of a pinch-pole driving apparatus according to the present invention; FIG.

FIG. 5 shows a state before the pinch roller according to the present invention is squeezed, and FIG. 5 is a plan view, and FIG. 5 b is a front view.

FIG. 6 shows a state in which the pinch roller according to the present invention is squeezed, wherein FIG. 6 (a) is a plan view, and FIG. 6 (b) is a front view.

FIG. 7 is a partial perspective view showing a fixed state of the spring according to the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

100: Base 110: Shaft

120: pinch gear 122: gear portion

123: rotation part 124: inclined guide groove

130: holder 132: boss

134: post 136: spring

140: pinch roller 150: cam gear

152: cam home

The present invention relates to a pinch roller of a magnetic recording and reproducing apparatus, and more particularly, to a pinch roller driving apparatus which is configured such that a pinch roller integrally assembled with a holder is elastically supported on a capstan side by a spring mounted on the holder .

In a magnetic recording and reproducing apparatus such as V-crow, the running of the tape between the take-up reel and the supply reel is carried out by a gap stern shaft rotated by a gap stern motor and a pinch roller closely attached to the capstan shaft with the tape therebetween . A conventional pinch roller driving apparatus will be described with reference to FIGS. 1 to 3.

A shaft 2 is press-fitted into a base 1 of a magnetic recording and reproducing apparatus and a pinch gear 3 is rotatably inserted into the shaft 2. A gear portion to which a driving force is transmitted is formed in a lower end portion of the pinch gear 3, and an inclined guide groove sloped along the outer circumferential surface is formed in the upper portion.

A holder for up and down movement is coupled to the upper portion of the pinch gear by rotation of the pinch gear. The holder inserted in the upper portion of the pinch gear includes a first boss which is inserted into the inclined guide groove of the pinch gear and guides the up and down movement of the holder with respect to the rotational movement of the pinch gear, And a second boss slidably fitted in the cam groove of the cam gear.

A bushing is rotatably supported at an upper end of the holder, and the upper end of the bushing is fixed to the arm. At the other end of the arm, a post for rotatably housing the pinch roller is caulked, and the post is supported by the cap in a state in which the pinch roller is rotatably fitted. As shown in FIG. 2, the arm and the holder are connected by a tension spring. The cam gear meshed with the gear portion of the pinch gear is formed with a cam groove of a predetermined shape in the center portion thereof and is rotatably supported on the base in a state of being meshed with the gear portion.

The operation of the mechanism constructed as described above will be described.

When the reproducing or recording mode is selected while the video cassette is loaded, the tape loading device is operated so that the tape in the video cassette is brought into close contact with the drum (not shown) and the capstan shaft. At this time, the capstan motor rotates to rotate the gap stern shaft, while the loading motor (not shown) is driven to rotate the pinch gear installed on the base in one direction.

As the pinch gear rotates, the formed inclined guide groove is rotated on the upper peripheral surface, and the holder is lowered by the first boss of the holder fitted in the inclined guide groove. As the holder is lowered, the pinch roller connected through the arm is also lowered.

When the holder is lowered to the bottom, the second boss is fitted in the cam groove of the cam gear, and the second boss inserted into the cam groove due to the rotation of the cam gear rotating with being engaged with the pinch gear rotates while making contact with the cam groove The arm is brought into close contact with the capstan shaft side. At this time, the arm and the holder are connected by the spring, and the pinch roller mounted on the end of the arm is closely contacted to the capstan shaft.

In this state, the tape is pulled by the rotational force of the capstan shaft between the rotating capstan shaft and the pinch roller closely attached thereto.

However, according to the conventional pinch roller as described above, the following disadvantages are pointed out. First, the configuration of a mechanism for driving a pinch roller closely attached to a capstan shaft is complicated. And the pinch rollers connected by the arms and the posts are complicated, the manufacturing and assembly processes of the respective components are complicated, which is disadvantageous in terms of productivity.

Also, due to the complicated components, it is difficult to precisely maintain the perpendicularity dimension that affects the stable travel path of the tape when the pinch roller is brought into close contact with the capstan shaft with the tape interposed therebetween, And the problem of causing noise on the screen can be pointed out.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive device for a pinch roller which is constructed in a simpler manner.

In order to achieve the above object, a pinch roller driving apparatus according to the present invention includes: a capstan shaft for applying driving force in contact with a tape; a pinch roller closely attached to the capstan shaft with a tape therebetween; A pinch roller supporting means having an elastic member for resiliently urging the pinch roller against the capstan shaft, and an elastic member for supporting the pinch roller supporting means to the capstan shaft side by engaging with the elastic member of the pinch roller supporting means And a pinch roller driving means for driving the pinch roller.

The elastic member mounted on the pinch roller supporting means is constituted by an elastic arm having one end inserted into the fixing hole of the supporting means and a leaf spring having a projection projecting downward from the other end of the elastic arm, To the capstan shaft side and to elastically support the pinch roller toward the capstan shaft side in a moving state.

Wherein the pinch roller driving means comprises vertical moving means for vertically moving the pinch roller to the running plane of the tape and horizontal moving means for bringing the pinch roller into close contact with the capstan shaft, And a cam gear having a cam groove in which protrusions are movably housed. The elastic member rotates the pinch roller of the holder toward the capstan shaft by rotation of the cam gear.

According to the pinch roller driving apparatus of the present invention, the elastic member mounted on the holder simultaneously performs the horizontal movement of the pinch roller and the pinch roller closely cooperates with the capstan shaft in the moved state. The present invention will be described in more detail based on the illustrated embodiments.

As shown in FIG. 4, the pinch roller driving apparatus according to the present invention includes a pinch gear rotated by a driving source, and a holder vertically moved by the pinch gear and having a pinch roller mounted on one side.

When the pinch gear is inserted into a shaft fixed to the base and is rotatably supported, the rotational force of a loading motor (not shown) is transmitted through a gear train to be rotatable. The pinch gear includes a gear portion through which rotational force of a loading motor is transmitted through a gear train, and a rotating portion formed with an inclined guide groove formed in a spiral shape on a cylindrical body on the gear portion.

On the upper portion of the pinch gear, a holder which moves up and down according to the rotation of the pinch gear and rotates to the capstan motor side by the cam gear is engaged. The holder has a lower end boss which is slidably inserted in the inclined guide groove and a downwardly extending post for rotatably coupling the pinch roller. The post and the boss are molded integrally with the holder. When the pinch gear is rotated, the boss is slidably inserted in the tilted guide groove of the pinch gear. The pinch gear is slid along the tilted guide groove along the tilted guide groove, So that it can move up and down. In the post extending downward from the upper end of the holder, the pinch roller is supported so as not to be separated by the cap in a state in which the pinch roller is rotatably inserted.

As shown in FIGS. 4 and 7, the holder is caulked with a spring formed of a leaf spring having a downward projection on one side. The spring is composed of an elastic arm which is press-fitted into a fixture formed at the lower end of the opposite side of the boss and has a certain elasticity, and a protrusion inserted into a cam groove of a cam gear described later to elastically support the pinch roller toward the capstan shaft. That is, when the protrusion is inserted into the cam groove of the cam gear, the pinch roller will be brought into close contact with the cam stern shaft of the capstan motor while rotating along the cam groove by the rotation of the cam gear.

As described above, the holder according to the present invention is formed integrally with the post which rotatably supports the pinch roller while moving up and down in accordance with the rotation of the pinch gear, and the spring, which is press- To rotate toward the capstan motor side.

A cam groove into which the lower end projection of the above-described spring is inserted is formed in the cam gear supported on the base in a state of engaging with the lower gear portion of the pinch gear. When the cam groove is rotated by the pinch gear, the protrusion is moved in accordance with the shape of the cam groove to rotate the holder toward the capstan motor so that the pinch roller is brought into close contact with the capstan shaft Shaped.

Next, the operation of the pinch roller driving apparatus according to the present invention constructed as described above will be described. FIG. 5 shows a state before the pinch roller is compressed to the capstan shaft side, and FIG. 6 shows a compressed state.

When the driving force of the loading motor is transmitted to the pinch gear through the gear train when the video cassette is loaded, the pinch gear rotates in one direction. When the pinch gear is rotated, the holder is lowered by the boss of the holder slidably inserted into the spiral inclined guide groove formed at the outer periphery of the upper rotating portion of the pinch gear. At this time, the pinch roller and the spring will also be lowered together with the holder.

As shown in FIG. 6, when the holder is completely lowered, the protrusion of the spring, which is press-fitted into the lower end of the holder, is inserted into the cam groove of the cam gear. At this time, since the cam gear rotates in engagement with the pinch gear, one side wall of the cam groove moves while pushing the projection of the spring, and operates to rotate the spring toward the capstan motor. Since the spring is press-fitted into the holder, the pinch roller mounted on the holder is brought into close contact with the capstan shaft.

A state in which the pinch roller is in close contact with the capstan shaft is shown in Fig. As shown in the figure, in a state in which the projections are supported on one side wall of the cam groove, the elastic arms of the spring are bent to one side by supporting the holder on the capstan motor side. The elastic arm, which substantially acts as a leaf spring, elastically supports the pinch roller toward the capstan shaft due to its elastic restoring force in the bent state.

Therefore, the tape interposed between the rotating capstan shaft and the pinch roller closely attached to the capstan shaft is pulled by the rotational force of the capstan shaft and travels

According to the pinch roller driving apparatus of the present invention as described above, the following effects can be obtained. First, the pinch roller driving apparatus according to the present invention has a simple structure in which posts and the like for inserting pinch rollers are integrated, and compared with the conventional configuration in which the bushing, the arm, and the post are separately molded and assembled, And the efficiency of the assembling process is increased, which is advantageous in improving the productivity. In addition to improving manufacturing productivity, the simplification of these parts improves the reliability of long-term use of the product, and provides a relatively convenient advantage in management and maintenance.

Further, by integrating the respective components, it is possible to precisely maintain the dimensional accuracy of the tape that affects the stable running path of the tape of the pinch roller for pulling the tape, thereby preventing damage to the running tape and preventing noise on the screen There is an effect that can be done.

Claims (4)

A capstan shaft for applying driving force in contact with the tape; A pinch roller which is in close contact with the capstan shaft with a tape therebetween; an integrated post for rotatably supporting the pinch roller; and an elastic member for elastically urging the pinch roller against the capstan shaft. And pinch roller driving means for engaging with the elastic member of the pinch roller supporting means and driving the pinch roller supporting means to the capstan shaft side. 2. The image forming apparatus according to claim 1, wherein the elastic member comprises an elastic arm having one end inserted into the fixing hole of the supporting means and a leaf spring having a projection projecting downward from the other end of the elastic arm, And the pinch rollers are brought into close contact with the capstan shaft by elasticity of the leaf springs while being moved toward the capstan shaft side. The pinch roller driving device according to claim 1 or 2, wherein the pinch roller driving means comprises a vertically moving means for vertically moving the pinch roller to the running plane of the tape, and a horizontal shifting means for bringing the pinch roller into close contact with the capstan shaft . 4. The cam follower according to claim 3, wherein the horizontal moving means comprises a cam gear having projections of an elastic member and cam grooves in which the projections are movably housed, and the elastic member rotates the pinch rollers of the holder by the rotation of the cam gear, And rotates the pinch roller toward the shaft.