JPS61192060A - Tape loading device - Google Patents

Abstract

PURPOSE:To enable the positioning of a mobile desk with respect to a reference plane in high precision by separating a positioning means from an energizing means and obtaining the energizing power in the direction of the circumference of the mobile desk and the energizing power in the direction of the reference plane by two independent energizing means. CONSTITUTION:When a mobile desk approaches an edge 13, a side of a connecting bar 11 contacts a pressing part 42 of a coil spring 41 and rotates the coil spring 41 clockwise. Consequently the other pressing part 42 pushes up the mobile desk, pressing it to a reference plane 14, and the mobile desk is stopped where a contacted part 46 has contacted an edge of a grooves 31. When a loading ring 2 further rotates, a spring 5 stretches, a projection 6 separates from an edge of a long hole 15, the mobile desk 8 is given the force in the direction of the circumference of a rotary drum with strong power by a spring 5 and also given the force in the direction of the spindle of the rotary drum. Consequently a roller 4 and a guide pin 10 are stopped at the prescribed position with reference to the rotary drum and a magnetic tape is wheeled precisely with reference to the rotary drum.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape loading device in a magnetic recording/reproducing device having a rotating magnetic head, such as a video tape recorder.

[Conventional technology]

2. Description of the Related Art A magnetic recording/reproducing device having a rotating magnetic head, such as a video tape recorder, requires a tape loading device for winding a magnetic tape around the rotating head. FIG. 2 shows the configuration of a conventional tape loading device.

In the figure, 1 is a base such as a chassis, and 2 is a loading ring.

The loading ring 2 has a gear formed on its outer periphery, and is rotated on the base 1 by another gear to which it is connected (none of these are shown).The loading ring 2 can be slightly slidable with respect to the loading ring 2. It is a moving platform base installed in the loading ring 2, and is biased in the direction of the projection 4 (to the left in the figure) by a spring 5 stretched between it and the projection 4 protruding from the loading ring 2. The protrusion 6 of the movable table base 3 protruding into the elongated hole 15 is connected to the elongated hole 1.
5 so as to come into contact with the end 7 of 5. 8 is a moving table from which a magnetic tape (not shown) is pulled out.

A guiding roller 9 and a guide pin 10 are provided. Reference numeral 11 denotes a link-shaped connecting rod that connects the movable table base 3 and the movable table 8, and the connecting portions at both ends thereof are rotatable. Reference numeral 12 denotes a guide provided on the outer periphery of a rotating drum (not shown), and guides the movable table 8 obliquely from below to above the rotating drum. Guide 1
A reference surface 14 is provided near the terminal end portion 13 of 2.

Reference numeral 21 denotes a stopper, which comes into contact with the tapered portion 22 of the movable table 8.

In such a configuration, the movable table 8 is biased by the spring 5.
When the tapered portion 22 moves to the left (approximately in the same direction as the rotating drum), the tapered portion 22 comes into contact with the stopper 21, and when it is further urged, the tapered portion 22 is moved by the stopper 21, and therefore the moving table 8
is pushed up in the direction of the reference plane 14 (substantially in the direction of the rotation axis of the rotating drum), and the movable table 8 is positioned at a predetermined position.

[Problem that the invention seeks to solve]

However, in such a conventional configuration, the stopper 2
1 and the tapered portion 22 to position the movable table 8 and to obtain a biasing force in the horizontal and vertical directions (approximately in the same direction and approximately in the direction of the rotational axis of the rotating drum) toward the reference surface 14, which improves positioning accuracy. This has the disadvantage that a stable biasing force cannot be ensured, and as a result, the running of the magnetic tape tends to become unstable.

[Means for solving problems]

FIG. 1 shows the configuration of a tape loading device according to the present invention, and parts corresponding to those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the figure, 31 is a groove formed approximately in the center of the guide 12, and 32 is an end thereof. 41 has suppression parts 42 at both ends thereof.
．． 43 is a coil spring formed, and is attached to the base 1 via a shaft 44. 45 is a stopper that regulates the position of the coil spring 41. Reference numeral 46 denotes a contact portion of the movable table 8, which can come into contact with the end portion 32 of the groove 31. The contact portion 46 and the end portion 32 constitute a positioning means. The other configurations are the same as in FIG. 2.

[Effect]

The effect will now be explained. When the gear is rotated by a motor (not shown) or the like, the loading ring 2 rotates and moves to the left in the figure. At this time, the spring 5 urges the protrusion 6 until it comes into contact with the end 7, so
The movable base 3 rotates together with the loading ring 2. Therefore, the moving table 8 is moved on the guide 12 by being pressed by the connecting rod 11. As a result, rollers 9 and guide pins 10 pull out the magnetic tape from a cassette (not shown) and guide it. The moving table 8 gradually moves diagonally upward along the guide 12 from a portion parallel to the base 1 around the outer circumference of the rotating drum.

The guide 12 is made of synthetic resin, but the vicinity of its terminal end 13 is made of metal such as stainless steel in order to improve the accuracy of positioning the movable table 8. When the moving table 8 comes close to the terminal end 13, the side of the connecting rod 11 comes into contact with one of the pressing parts 42 of the coil spring 41, causing the coil spring 41 to rotate clockwise in the figure. As a result, the other pressing part 43 pushes up the movable table 8, and the reference surface 1
Press 4. In the movable table 8, the contact portion 46 is located at the end 3 of the groove 31.
It is parked at the position where it touches 2. loading ring 2
When it rotates further, the movable base 3 can no longer move, so the spring 5 stretches and the protrusion 6 separates from the end 7 of the elongated hole 15. Therefore, the movable table 8 is urged by the spring 5 with a strong force in substantially the same direction as the rotating drum, and by the coil spring 41 in the approximate direction of the rotational axis of the rotating drum (to be precise, different from the rotational axis direction). Ru. As a result, the rollers 9 and guide pins 10 fixed to the movable table 8 are parked at a predetermined position and angle with respect to the rotating drum, and the magnetic tape is accurately wound around the rotating drum.

When unloading, load ring 2
is rotated in the opposite direction, the reel of the cassette is driven in a direction to wind up the magnetic tape, and the magnetic tape is accommodated in the cassette.

〔effect〕

As described above, the present invention includes a movable base that pulls out a magnetic tape, a guide that guides the movable base around the outer periphery of the rotating drum, and parks the movable base at the end portion having a reference surface, and moves the movable base along the guide. Let me.

In a tape loading device for a magnetic recording and reproducing device that winds a magnetic tape around a rotating drum, the first biasing means biases the movable base in substantially the same direction as the rotary drum, and the positioning device positions the movable base at a parking position. and a second urging means for urging the movable table positioned by the first positioning means in the direction of approximately the reference plane, so that the first positioning means and the urging means are separate, and Since the biasing force in the direction of the same station and the biasing force approximately in the direction of the reference plane are obtained by two independent biasing means, it is possible to apply an appropriate biasing force to the movable base, and the movable base can be moved toward the reference plane. can be positioned with high precision. Therefore, stable running of the magnetic tape can be ensured.

[Brief explanation of drawings]

FIG. 1(a) is a partial plan view of the tape loading device of the present invention, FIGS. 1(b) and (c) are side views thereof, and FIGS. 2(a) and (b) are of a conventional tape loading device. FIG. 1... Base 2... Loading ring 3...
Moving base 5... Spring 8... Moving base
9... Roller 11... Connecting rod 12... Guide 14... Reference surface 31... Groove 32... End portion 41... Coil spring 46.
・Patent above the contact part Roganjin Pioneer Co., Ltd.

Claims (1)

[Claims] (1) A moving table that pulls out the magnetic tape, and a guide that guides the moving table around the outer periphery of a rotating drum and parks it on a reference surface, and moves the moving table along the guide to remove the magnetic tape. A tape loading device for a magnetic recording and reproducing device that winds a magnetic tape around the rotating drum, the tape loading device comprising: a first urging means for urging the movable base in a substantially circumferential direction of the rotary drum; and a first biasing means for biasing the movable base to a parking position. a second urging means for urging the movable table positioned by the positioning means substantially in the direction of the reference plane; the first biasing means and the second biasing means;
A tape loading device characterized in that the movable stage is biased in a substantially circumferential direction of the rotary drum and substantially in a direction of a reference plane by a biasing means.