JPS6128256Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning and adjusting jig for a video head.

The video head is required to be mounted with high precision on the rotating disk. Therefore, before the rotating disk for fixing the video head is attached to the rotating shaft in the cylinder, it is necessary to adjust the attachment position of the video head with respect to the rotating disk with high precision. Therefore, a video head positioning adjustment jig has been used in the past. FIG. 1 is a plan view showing a state in which a rotary disk on which a video head is temporarily fixed is attached to such a conventional device, and FIG. 2 is a sectional side view of the center thereof. Such a conventional device has a columnar projection 2 formed on a base 1, and two microscopes each having a video camera installed at a predetermined position facing each other on a straight line passing through the center of the columnar projection 2. A rotary disk 5 that temporarily fixes head support plates 4, 4 on which a pair of video heads 3, 3 are placed and fixed, respectively, is fitted into the columnar protrusion 2. In the fixed state, while watching the TV monitor of the video camera, slightly move the head support stands 4, 4, and monitor the protrusion amount of the video heads 3, 3 by focusing and the angle of the rotation direction. After each adjustment was made by checking with the reference line on the TV, the head support was fixed. However, as is clear from the figure, the fixing of the rotating disk 5 is
The through hole 5a of the rotary disk 5 is fitted into the columnar projection 2, and the fitting condition is that the inner diameter _r1 of the through hole 5a is larger than the outer diameter _r2 of the columnar projection 2. Therefore, a slight wobbling of the rotating disk 5 cannot be avoided. However, even a slight amount of looseness caused an adjustment error when adjusting the mounting position of the head in μ order.

Therefore, in view of the above-mentioned points, the present invention proposes a positioning adjustment jig that fixes a rotating disk with high precision and without play. The present invention will be described below with reference to an illustrative embodiment. FIG. 3 is a plan view of the device of this embodiment, FIG. 4 is a sectional view along AA', and FIG.
The figures each reveal a right side view. As is clear from the figure, in this embodiment, the conventional columnar protrusion is divided into two parts, and one (first) protrusion 2a is attached to the fixed block 1.
a, and the other (second) protrusion 2b is integrated with the sliding block 1b, allowing the sliding block 1b to slide along the guide blocks 1c, 1c, and the fixed block 1a. A pair of coil springs (biasing means) 7, 7 inserted in
a is biased in the direction of separation. The radius of curvature R ₂ of the outer periphery of both protrusions 2a, 2a is the same as that of the rotating disk 5.
The radius of curvature R ₁ of the through hole 5a is selected to be slightly smaller (R ₁ = 14.000 mm, R ₂ = 13.9975 mm), and the opposing portions of the protrusions 2 a and 2 b are cut slightly more than the semicircular cylinder. ing. Therefore, the rotating disk 5
When the sliding block 1b, which is locked to the retaining protrusion 6, is pushed towards the fixed block 1a in order to mount it, the opposing protrusions 2a and 2b will
After smoothly fitting into the through hole 5a and positioning the rotary disk 5 by appropriate means, the sliding block 1b is released, and both the protrusions 2a,
2b is the through hole 5a spaced apart by Δt (=0.2 mm).
It is elastically inscribed in two positions, and the rotating disk 5 is reliably fixed without play. Therefore, like the conventional example,
If the mounting positions of the video heads 3, 3 are adjusted using a microscope equipped with a video camera (not shown) and a monitor television, the accuracy of the adjustment will be much higher than in the past. Incidentally, the outer diameter of the rotating disk 5 of this embodiment is 67 mmφ, the distance connecting the tips of both video heads 3 is 74.6 mm, the length of the sliding block 1b in the sliding direction is 51 mm, and the thickness is is 15 mm, and the distance between the end faces of fixed block 1a and sliding block 1b in front of the rotating disk device is selected to be such that it can be easily held with one hand. Rotating disk 5 with the end faces of 1a and 1b sandwiched
positioning becomes possible. Furthermore, since the contact point between the through hole 5a and the protrusions 2a, 2b is approximately on the line connecting the video heads 3, 3, high mounting accuracy can be expected, especially in adjusting the amount of protrusion of the video head.

Therefore, according to the present invention, the biasing means causes the two protrusions to come into point contact within the through hole of the rotating disk only in the direction in which the video head is disposed, and as a result, the rotating disk does not move in the direction in which the video head is disposed. Since the direction is more strongly defined, accurate and stable positioning of the rotating disk becomes possible.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional device; Fig. 2 is a sectional view of the center of the same; Fig. 3 is a plan view of an embodiment of the device of the present invention;
The figure shows a sectional view along AA' of the same figure, and FIG. 5 shows a right side view of the same. Explanation of main drawing numbers, 3, 3...Video head, 5
... Rotating disk, 5a ... Through hole, 2a ... (first
) protrusion, 1a...fixed block, 2b...(second) protrusion, 1b...sliding block, 7,7...
(Biasing means) Coil spring.

Claims (1)

[Claims for Utility Model Registration] A first protrusion having a cut surface; a fixing block having the first protrusion on its upper surface and having an end surface flush with the cut surface of the first protrusion; , a second protrusion forming a cylindrical body with cut surfaces in contact with the first protrusion; and the second protrusion is arranged on the upper surface and the end face is connected to the second protrusion. a sliding block that is formed flush with a cut surface of the block and whose upper surface is flush with the fixed block; and urging means that urges opposing end surfaces of the fixed block and the sliding block in a direction of separation. a rotating disk having a pair of video heads arranged in a radial direction perpendicular to the cut surfaces of the two protrusions with through holes having a slightly larger diameter than the protrusions fitted in the protrusions; A video head positioning and adjustment jig consisting of each video head.