JPS6341142B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape guide fixing mechanism of a magnetic tape loading section in a magnetic recording/reproducing apparatus.

Conventionally, the method for fixing the tape guide to the rotating cylinder has been to use U grooves or V grooves arranged in the vertical direction of the tape guide moving table.
A conventional example of a tape guide fixing mechanism will be described in detail below with reference to FIGS. 1 to 3.

FIG. 1 is a plan view of the magnetic recording/reproducing device in a stopped state, FIG. 2 is a plan view of the magnetic recording/reproducing device in its recording/reproducing state, and FIG.
The figure is a perspective view of a conventional tape guide (moving stage) fixing means.

In FIG. 1, 1 is a chassis, 2 is a rotating cylinder equipped with a rotating magnetic head, and 3 is a cassette. On the chassis 1, an inlet side rack groove 10 and an outlet side rack groove 1 are provided almost concentrically with the rotating cylinder.
1 is cut, and each groove has an inlet side rack 12.
And the outlet side rack 13 is inserted so as to be able to slide smoothly within the groove. Furthermore, each Rack 1
2 and 13 are connected to an inlet tape guide 8 and an outlet tape guide 9, and the tape guides 8 and 9 are connected to an inlet guide groove 23 and an outlet guide groove 2 provided in the sub-chassis 17.
It has a structure that allows it to slide smoothly along 4.

Loading of the magnetic tape 22 onto the rotary cylinder 2 will be explained with reference to FIG. The loading driving force is transmitted to the racks 12 and 13 by the rotation of the rack drive gear 14 in the direction of arrow A, and the racks 12 and 13 slide and move in the directions of arrows B and C along guide grooves 23 and 24. Then, the entrance tape guide 8 and the exit tape guide 9 move while pulling out the magnetic tape 22 from the cassette 3, and are positioned by the entrance catcher 15 and the exit catcher 16, and the movement of the tape guides 8 and 9 is completed. . Finally, the pinch roller 7 is pressed against the capstan 6, and the loading is completed. The loaded magnetic tape 22 is driven by the capstan 6 and the pinch roller 7 in the direction of arrow A in FIG. That is, from the supply reel 4, the erase head 18, the inlet impedance roller 19, the inlet tape guide 8, the rotating cylinder 2, the outlet tape guide 9, the outlet impedance roller 20, the audio control head 21, and the capstan 6.
After that, it is wound onto take-up reel 5.

Next, the tape guide fixing means will be explained in detail with reference to FIG. FIG. 3 shows the entrance tape guide 8 and the entrance catcher 15. Entrance side tape guide 8
slides on the sub-chassis 17 along the entrance side guide groove 23 in the direction of arrow B in the figure with the tape wound around the guide roller 8a and the inclined pin 8b that are set up on the tape guide 8. A position regulating pin 8f is inserted into the guide groove 23 to regulate the sliding path, and the regulating pin 8f also transmits the driving force of the tape guide 8. Movement direction B
The position is determined by the wedge-shaped slope 8d provided at the tip of the tape guide 8 and the catcher 15.
The positioning in the direction perpendicular to the moving direction B (in the directions of arrows D and E) is performed by the engagement between the position regulating pin 8f and the position regulating U groove 15d. It will be done. Next, the rotation in the plane perpendicular to the moving direction B (in the directions of arrows F and G) is restricted by the engagement of the tilting restriction pin 8c and the tilting restricting U groove 15a, and the vertical movement of the tape guide 8 is restricted. This is achieved by the tip portion consisting of the height regulating surface 8e and the wedge-shaped slope 8d coming into contact between the height reference surface 15c and the stopper 15b. Furthermore, regulation of the tilting direction (in the directions of arrows H and I) with respect to the moving direction B of the tape guide 8 is performed by the abutment between the rear part of the sliding surface 8g and the sub-chassis 17. Such tape guide fixing means has the following disadvantages due to its structure.

As a means for restricting the rotation of the tape guide 8 in a plane perpendicular to the moving direction (in the directions of arrows F and G),
Since the tape guide 8 requires a tilting regulating pin 8c and the catcher 15 requires a tilting regulating U groove 15a, it is difficult to make the entire device thinner and the cassette thinner.

As described above, the amount of sliding friction required for engagement between the tilting regulating pin 8c and the tilting regulating U groove 15a is required as extra driving force.

Since the sub-chassis 17 regulates the tilting direction (arrow H and I directions) with respect to the moving direction of the tape guide 8, errors in component accuracy and assembly accuracy of the catcher 15 and the sub-chassis 17 will cause the tape guide 8 to tilt in the tilting direction. This adversely affects the position regulation accuracy.

An object of the present invention is to provide a tape guide that is thin and lightweight so as to eliminate the above-mentioned disadvantages of the prior art, and to make it possible to reduce the thickness of the cassette and the overall thickness of the device in a magnetic recording and reproducing device. The purpose is to provide a fixing mechanism.

The feature of this invention is that the inclination of the tape guide with respect to the moving sliding surface is not controlled by U grooves or V grooves provided at the upper and lower ends of the tape guide, but the tape guide is The cross-sectional shape is wedge-shaped in the direction of travel,
Among the sliding surfaces and inclined surfaces that constitute the wedge shape, from the point where the sliding surface has pins planted, there is a corresponding slope and a reference surface corresponding to the wedge shape of the tape guide, and the corresponding shape A protrusion is formed on the slope,
A stopper formed of a U-shaped groove opening in the direction in which the tape guide advances is provided on the reference surface, and the stopper regulates the inclination of the tape guide with respect to the moving sliding surface. It's what I did.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a perspective view showing an embodiment of the present invention. In the same figure, the entrance side tape guide 25
slides on the sub-chassis 17 along the guide groove 23 in the direction of arrow C. At this time, the magnetic tape 22 is wound around the roller 25a and the inclined guide 25b which are set up on the guide body 25, and a loading operation is performed. The drive pin 25e protruding downward from the guide sliding surface 25d transmits the loading driving force to the guide 25, and also serves to engage with the guide groove 23, ultimately regulating the width of the entrance side stopper 26. It is engaged with the U groove 26c, and the arrow J of the guide body 25
and positioning in the K direction. The stopper in the moving direction C of the guide body 25 is caused by the contact between the inclined surface 25c and the convex portion 26a. Further, rotation in a plane perpendicular to the moving direction C (arrows L and M) is prevented by contact between the guide sliding surface 25d and the reference surface 26b. Furthermore, the regulation of the tilting direction (arrows N and O) is as follows:
This is achieved by a tilt regulating surface 26d formed integrally with the entrance side stopper 26. Further, the vertical movement of the tape guide 25 is restricted by the guide sliding surface 25d,
This is achieved by the pressure contact surface between the wedge-shaped inclined surface 25c and the convex portion 26a, with reference to the contact surface between the reference surface 26b and the tilt control surface 26d.

I'll add a little bit of explanation. When the tape guide body 25 advances to the stopper 26 in a state in which it rotates around the drive pin 25e and shakes its head from side to side with respect to the direction of travel, first the inclined surface 2
5c and the wedge-shaped inclined surface 26e are not parallel to each other but partially abut.

When the tape guide 25 advances further, the inclined surface 25c is obliquely pressed against the wedge-shaped inclined surface 26e at its abutting portion, and as a result, forces act in directions parallel to each other, and the tape guide 25 By changing the attitude in this way, the inclined surface 25c is oriented substantially in the direction of travel.

As the tape guide 25 further advances, the inclined surface 2
5c comes into contact with the convex portion 26a. In this case as well, it is highly conceivable that the inclined surface 25c and the convex portion 26a come into contact with each other at a slight inclination, as in the above case. However, the slope 25
c and the convex portion 26a are pressed against each other in an inclined manner, and a force is exerted to make the tape guide body 2 parallel to each other.
5 corrects its posture so that it contacts the convex portion 26a in parallel, and as a result, it is fixed in a predetermined correct orientation with respect to the traveling direction.

That is, by receiving the drive pin 25e of the tape guide 25 that has advanced into the width regulating U groove 26c, the tape guide 25 is positioned in the left and right direction perpendicular to the traveling direction, and the sliding surface of the tape guide that has advanced 25d is located on the reference surface 26b and the tilt control surface 26d, and the tape guide body 2
The inclined surface 25c of No. 5 is a wedge-shaped corresponding inclined surface 26.
The tape guide 25 is moved in the traveling direction until only the protrusion 26a on the slope 26e comes into contact with the slope 25c of the tape guide 25. The object is positioned and fixed in the vertical direction perpendicular to , and in the inclination.

In this embodiment, the tilt regulating surface 26d is provided in the same plane as the reference surface 26b to increase its regulating effect.
It goes without saying that the role of can be fulfilled by the reference surface 26b.

As described above, according to the present invention, the following effects can be obtained.

Since all the positioning means for the magnetic tape guide can be concentrated in the catcher, high positioning accuracy can be obtained.

Among the positioning means, the structure is such that the rotation is restricted in a plane perpendicular to the direction of movement of the guide body in a plane parallel to the sliding surface of the movement, so that the catcher and the guide body can be made thinner. It is possible,
Contributes to making the entire device thinner.

For the same reason as above, it is possible to reduce the drag force when the guide body enters the catch, and the driving force of the guide body can be reduced.

[Brief explanation of the drawing]

1 is a plan view of a conventional magnetic recording/reproducing device in a stopped state, FIG. 2 is a plan view of the same device in a recording/reproducing state, FIG. 3 is a perspective view of a conventional tape guide fixing mechanism, and FIG. The figure is a perspective view showing one embodiment of the present invention. Description of symbols 1... Chassis, 2... Rotating cylinder,
3...Cassette, 8...Entrance side tape guide, 9...Outlet side tape guide, 15...Entrance side catcher, 1
6...Exit side catcher, 17...Sub chassis, 2
2...Magnetic tape, 25...Entrance side tape guide, 2
6... Entrance side stopper.

Claims (1)

[Claims] 1. The cross-sectional shape along the traveling direction is wedge-shaped, and the pin 25e is attached to the sliding surface 25d of the sliding surface 25d and the inclined surface 25c that constitute the wedge shape. In a tape guide fixing mechanism for positioning an erected tape guide (a tape guide serving as a moving stage for pulling out a magnetic tape from a cassette) near a rotating cylinder equipped with a magnetic head, a corresponding type corresponding to the wedge shape of the tape guide is provided. It has a slope 26e and reference surfaces 26b, 26d, the corresponding slope 26e is formed with a protrusion 26a, and the reference surfaces 26b, 26d are provided with a U-shaped groove that opens in the direction in which the tape guide advances. 26c, by receiving the pin 25e of the tape guide that has progressed into the U-shaped groove 26c, positioning the tape guide in the left and right direction perpendicular to the direction of movement of the tape guide, and also positioning the tape guide that has moved forward. The sliding surface 25d of the tape guide is located on the reference surfaces 26b and 26d, and the inclined surface 25c of the tape guide continues to advance and finally reaches the corresponding inclined surface 2.
A tape in a magnetic recording and reproducing apparatus characterized in that the tape guide is positioned and fixed in the vertical direction and inclination perpendicular to the traveling direction until the protrusion 26a on the tape guide comes into contact with the inclined surface 25c of the tape guide alone. Guide fixing mechanism.