JPH02249119A - Fine position adjusting mechanism in magnetic tape device - Google Patents

Abstract

PURPOSE:To realize fine position adjustment corresponding to the making of a track into a narrow track by providing an adjusting screw whose inside is comprised of a female screw and whose outside of a male screw and whose progressive directions are set oppositely to each other and with different lead, an inside member, an outside member, and a means to block relative turning between the inside member and the outside member. CONSTITUTION:The adjusting screw 10 is comprised in such a way that its inside is comprised of the female screw and its outside of the male screw, and the progressive directions are set oppositely to each other, and different lead are set. And the adjusting screw 10 is screwed with the inside screw 11 in advance, and when the adjusting screw 10 is screwed with a rotary cylinder 9, they progress to a position until it reaches an adjusting position. However, by cutting the cone shape tip of the inside screw 11 to shape corresponding to an aperture 7a, turning can be blocked by the fitting of the inside screw in a head base 7 when the screw arrives at the base. Furthermore, by screwing the adjusting screw 10 with the rotary cylinder 9, the inside screw 11 presses the head base 7 by pitch difference between two screws 10 and 11. Thereby, the fine position adjustment can be performed by reducing the pitch difference.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fine position adjustment mechanism in a magnetic tape device.

Conventional technology A conventional position adjustment mechanism will be explained.

FIG. 7 is a sectional view of a position adjustment mechanism of a conventional rotary magnetic head device. In the figure, 1 is a video head, 2 is a helad base, 3 is a fixing screw, 4 is a rotating cylinder, and 5 is an adjusting screw.

The operation of the position adjustment mechanism configured as described above will be explained below.

When the adjusting screw 5 is screwed into the rotary cylinder 4, the adjusting screw 5 presses against the head base 2, causing the head base 2 to bend and the position of the video head 1 to change.

This position adjustment of the rotary magnetic head device is necessary to eliminate track pitch deviation, and is performed with an accuracy of approximately ±1 micrometer.

Problems to be Solved by the Invention However, the conventional configuration described above has a problem in that minute position adjustment is difficult because the rad base is pushed by the amount of movement of the adjustment screw.

For example, with an M2×0.25 screw, the amount of movement of 1 micrometer is 1.44 degrees of rotation of the screw, and adjusting this amount is extremely difficult and time consuming.

The present invention solves the above-mentioned conventional problems, and aims to provide a fine position adjustment mechanism for a magnetic tape device.

Means for Solving the Problems In order to achieve this object, the fine position adjustment mechanism of the magnetic tape device of the present invention is constructed with a female thread on the inside and a male thread on the outside, so that the threads travel in opposite directions. and adjusting screws with different leads, an inner member screwed into the female thread of the adjustment screw, an outer member screwed into the male thread of the adjustment screw, and a relative rotation between the inner member and the outer member. and a blocking means for blocking.

Effect of the present invention With the above-described configuration, when the adjustment screw that has been previously screwed into either the inner member or the outer member is screwed into the other screw, the adjustment screw is screwed in advance until it reaches the adjustment position. The placed member moves in unison with the adjustment screw, but from just before the adjustment position, it is prevented from rotating and moves in a straight line, so it moves based on the pitch difference between the two screws, so reduce this pitch difference. By doing so, fine position adjustment becomes possible.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a fine position adjustment mechanism of a rotary magnetic head device according to a first embodiment of the present invention. In Fig. 1, 6 is a video head, 7 is a helad base,
8 is a fixing screw, 9 is a rotating cylinder, 10 is an adjustment screw,
11 is an internal thread.

The adjusting screw 10 has a female thread on the inside and a male thread on the outside, and the screws advance in opposite directions and have different leads.

The operation of the fine position adjustment mechanism of this embodiment configured as described above will be described below.

The adjustment screw 10 is screwed together with the inner screw 11 in advance. The adjusting screw 10 is screwed into the rotating cylinder 9. The inner screw 11 advances together with the adjustment screw 10 until it reaches the adjustment position. However, by providing an opening lower a in the shape shown in FIG. When the tip reaches the conical shape, it is guided to the opening lower a, and the rotation is prevented by fitting. When the adjusting screw 10 is further screwed into the rotary cylinder 9, the inner screw 1 becomes as shown in FIG.
1 advances at the pitch P1 of the outer thread of the adjusting screw 10 and retreats at the pitch P2 of the inner thread of the adjusting screw 10. As a result, the inner screw 11 pushes the head base 7 with a pitch equal to P1 minus P2.

As described above, according to this embodiment, by providing an inner screw and preventing the inner screw from rotating after reaching the opening of the head base, the head base can be adjusted by adjusting the pitch difference between the two screws. Can be pressed.

FIG. 4 shows a cross-sectional view of a fine position adjustment mechanism for a tape guide post in a second embodiment of the present invention. In the same figure, 12 is an upper flange, 13 is an adjustment screw, and 14 is an upper flange.
15 is a post shaft, 16 is a lower flange, 17 is a spring, and 18 is a base. The adjusting screw 13 has a female thread on the inside and a male thread on the outside, and the screws advance in opposite directions and have different leads.

The operation of the fine position adjustment mechanism configured as described above will be described below.

The adjustment screw 13 is screwed into the upper flange 12 in advance. The adjustment screw 13 is screwed into the post shaft 14.

The upper flange 12 moves together with the adjustment screw 13 until it reaches the adjustment position. However, as shown in FIG. 5, the lower side of the threaded portion 14a of the post shaft 14 is cut into the shape shown in FIG. 6, and the center of the upper flange 12 is also shaped to correspond to 14b. The upper flange 12 has a cut portion 14
When it reaches point b, it is fitted and rotation is prevented. When the adjusting screw 13 is further screwed into the post shaft 14, the upper flange 12
comes to be threadedly engaged with the adjustment screw 13.

Therefore, the upper flange 12 pushes the post 15 by the difference in pitch between the two screws.

As described above, according to this embodiment, the upper flange is provided with a screw and is prevented from rotating after the upper flange reaches the cut portion on the lower side of the threaded portion of the post shaft. can be pushed by the difference in pitch between the two screws.

Effects of the Invention As described above, the present invention has an adjusting screw that is configured with a female thread on the inside and a male thread on the outside, the threads of which travel in opposite directions and have different leads, and an inner screw that is screwed into the female thread of the adjustment screw. By providing a member, an outer member screwed into the male thread of the adjustment screw, and a means for preventing relative rotation between the inner member and the outer member, by turning the adjustment screw, one member can be rotated. It advances in unison with the adjustment screw until it reaches the adjustment position, and from before the adjustment position it advances according to the pitch difference between the two screws. By reducing the pitch difference between the two screws, it is possible to achieve a fine position that corresponds to narrower tracks. Adjustment becomes possible, which is effective in shortening adjustment time and increasing accuracy.

For example, one screw is M2X0.25, the other screw is M2
When I x 0.2, the amount of movement of 1 micrometer is 7.2 degrees of rotation of the screw, which means that adjustment can be performed with an accuracy five times that of the above example.

[Brief explanation of drawings]

2 is a plan view of the helad base of the same embodiment, FIG. 3 is a partial sectional view of FIG. 1, and FIG. 4 is a second embodiment of the present invention. 5 and 6 are front views and A-A sectional views of the post shaft of the same embodiment, and FIG. 7 is a position adjustment mechanism of a conventional rotary magnetic head device. FIG. 3 is a cross-sectional view of the mechanism. 7...Head base, 9...Rotating cylinder, 1
0...adjustment screw, 11...inner screw, 12
...Top flange, 13...Adjustment, 14
...Post axis, 15...Post. Name of agent Patent attorney Shigetaka Awano 1 fool Figure I/') Figure G--14b

Claims (1)

[Claims] An adjusting screw having a female thread on the inside and a male thread on the outside, the screws traveling in opposite directions and having different leads, an inner member screwed into the female thread of the adjustment screw, and an inner member of the adjustment screw. 1. A fine position adjustment mechanism for a magnetic tape device, comprising: an outer member that is screwed into a screw; and a blocking means that prevents relative rotation between the inner member and the outer member.