JPH079725B2 - Tape guide post positioning mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a positioning mechanism for a tape guide post in a magnetic recording / reproducing apparatus such as a VTR.

[Prior art]

Conventionally, in a VTR, as a positioning mechanism at the time of completion of tape loading of a tape guide post unit for pulling out a magnetic tape from a cassette and loading it on a rotary head cylinder, there is, for example, one shown in FIG.

When the tape loading of the tape guide post unit (hereinafter referred to as "guide post unit") 1 tilted in a predetermined direction with a predetermined inclination angle is completed, the guide post unit 1 is positioned on the drum mounting table. 2 slides along with the rotation of the loading ring 3 along the cam 4 formed on the upper part of the upper end 2, and rises to the end portion 4e having a required inclination, and forms the V-shape 4v engraved on the end portion 4e. Unit 1
This was done by pressing the positioning pin 1p of [1] and pressing. The upper surface of the drum mounting table 2 of the catching portion is at a right angle to a predetermined inclination of a tape guide post (hereinafter referred to as "guide post") 5, and the guide post unit 1 in which the guide post 5 is planted at a right angle is , Is carried through a loading spring 6 mounted on the loading ring 3.

Therefore, in such a conventional positioning mechanism, extremely high precision is required for processing the drum mounting table, and the height direction of the guide post is not reliably positioned,
As a result, there are drawbacks such as poor precision of cutting, a large contact area between the guide post unit and the drum mounting table, and a large loading load.

〔Purpose〕

This invention was made by focusing on the above problems,
It is an object of the present invention to provide a tape guide post positioning mechanism capable of performing accurate positioning in the height direction of the guide post without increasing the loading load by an inexpensive means.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

First, the configuration will be described.

Reference numeral 11 denotes a guide post unit, which is vertically slidably and tiltably connected to a column 18 which is erected on a loading ring 13 which surrounds a lower portion of the drum mounting table 12 and rotates. Further, a pair of rollers rotatably fitted in a guide groove 14 formed on the side surface of the drum mounting table 12.
It is provided with 16 and by this, as the loading ring 13 rotates, it slides up and down. Since the guide post unit 11 is inclined toward the drum mounting table 12 side at an angle α (not shown), the large and small size of the guide post unit 11 is planted at both ends of the unit 11 at right angles to the upper surface. The two guide posts 15 are also inclined to the drum mounting table 12 side by the same angle α.

As the height positioning mechanism 17, the line connecting the top surfaces forms a required angle θ with the upper surface of the unit 11 at the center of the guide post unit 11, and the loading ring is mounted on the top surface of the column 18. Two long and short protrusions 20 that are in contact with a leaf spring 19 fixed in a T-shape parallel to the upper surface of 13 are provided so as to sandwich the column 18.

Next, FIG. 2 is a front view of the guide post unit 11 when the tape loading is completed, and FIG. 3 is a plan view showing the cutting mechanism.

In the catching mechanism 21, the guide post unit
A cam plate 22 having a concave portion 22h formed at the center of the outer surface on the lower surface of 11
Is integrally fixed by a pair of connecting pieces 23, and on the other hand, a rotatable chatter plate is provided on the top surface of a cylinder 25 which is erected on a bracket 24 protruding from a required portion on the side surface of the chatter portion of the drum mounting table 12. 26 is mounted, one end of which is hooked on the bracket 24 and is urged toward the drum mounting table 12 side by the other end of the coil spring 28 wound around the column 25,
A stop piece 26a attached to a part of the 12 side surfaces is in contact with the side surface. An engaging roller 27 that fits into the recess 22h of the cam plate 22 is provided at the top end of the upper surface of the catching plate 26.

Reference numeral 30 denotes a tape loading end detection switch fixed to a chassis (not shown), which is operated by contact with an operating portion 18s projecting from the lower end of the column 18. Further, the guide groove 14 is inclined upward with an inclination angle θ in the chattering portion.

Next, the operation will be described.

In the initial position shown in FIG. 1, the guide post unit 11 in which a tape (not shown) is hung on the guide post 15 is rotated while being guided by the guide groove 14 through the roller 16 as the loading ring 13 is rotated. Then, when reaching the catching portion, first, the front slope of the cam plate 22 integral with the guide post unit 11 contacts the locking roller 27, and the roller
The pushing plate 26 is pushed outward to open the catching plate 26 outward against the elastic force of the coil spring 28.However, when the stopping plate 27 reaches the recess 22h as the cam plate 22 advances, the restoring force of the spring 28 is restored. The closing plate 26 tries to close the
27 is fitted in the recess 22h and stops the cam plate 22, that is, the guide post unit 11. As a result, the unit 11 is positioned in the plane direction, that is, in the lateral direction.

At this time, in the guide post unit 11, since the guide groove 14 is inclined upward at the required angle θ in the cutting portion, the guide post unit 11 is slid up along the support column 18 while inclining, and the guide mechanism 21 is moved by the cutting mechanism 21. Since the two long and short protrusions 20 are pressed against the leaf spring 19 at the time of being stopped,
Positioning is performed in the height direction, that is, the vertical direction.

Simultaneously with these positionings, the tape loading end detection switch 30 is operated by the operating portion 18s of the column 18, whereby the loading motor (not shown) is stopped.

[Advantages of the Invention] As described above, according to the present invention, the guide posts are positioned laterally by the cutting mechanism and vertically by the height positioning mechanism. Not only is positioning possible, but the loading load is extremely small.

Particularly, since the height positioning mechanism performs positioning by contacting the contacted portion with the contacted portion when the tape guide post moves to the vicinity of the tape winding operation end position, immediately before positioning, The tape guide post can be positioned smoothly without sudden impact, and the positioning motor is not subjected to excessive load during positioning and is not affected by the torque of the loading motor. There is an effect that accurate and stable positioning can be performed.

[Brief description of drawings]

FIG. 1 is a front view showing a state at the time of initial movement of a tape loading according to an embodiment of the present invention, FIG. 2 is a front view showing a state after completion of the tape loading, and FIG. FIG. 4 is a plan view showing a conventional tape guide post positioning mechanism. 11 …… Tape guide post unit 12 …… Drum mounting table 13 …… Loading ring 14 …… Guide groove 15 …… Tape guide post 17 …… Height positioning mechanism 18 …… Post 19 …… Plate spring 20 …… Protrusion 21 …… Catching mechanism 22 …… Cam plate 26 …… Catching plate

Claims (1)

[Claims] 1. A tape guide post provided at a tape guide unit that moves outside the rotary head cylinder to wind the tape around the rotary head cylinder as the drive member moves, at a tape winding operation ending position. A positioning mechanism, which is a catching mechanism for positioning the tape guide post in a horizontal direction perpendicular to the tape guide post, and a height for positioning the tape guide post in the vertical direction with respect to the tape guide post. A positioning mechanism, wherein the catching mechanism comprises a restraint member near the tape winding operation end position of the tape guide post, and when the tape guide post moves to the tape winding operation end position, The tape guide unit having the tape guide post and the restraint member The positioning is performed in a lateral direction at a right angle to the tape guide post by fitting, and the height positioning mechanism includes a contacted portion provided on the drive member and a contact portion provided on the tape guide unit. When the tape guide post is moved to the vicinity of the tape winding operation end position, the contact part contacts the contacted part, so that the tape guide post moves vertically with respect to the tape guide post. A tape guide post positioning mechanism characterized by directional positioning.