JPS59223925A - Rotating body assembly of rotary device - Google Patents

Abstract

PURPOSE:To attain high-precision rotation without requiring a high working precision by fixing an upper rotary cylinder to a revolving shaft and attaching a bearing housing freely rotatably to the outside circumference of the revolving shaft through a bearing and fixing a lower fixed cylinder to this bearing housing so that the attaching position can be adjusted. CONSTITUTION:An upper rotary cylinder 1 is connected to a revolving shaft 2 by press-fitting or the like, and a head 4 is attached to the cylinder 1, and a rotating-side rotary transformer 7 is connected to it by adhesion or the like. Upper and lower ball bearings 9 and 10 are attached to a bearing housing 15, and a fixed-side rotary transformer 8 is connected to the bearing housing 15 by adhesion or the like. The revolving shaft 2 is inserted to the housing 15 in this state, and a preparatory pressure is applied to a bearing stopper 11 by a spring 12 positioned by an end ring 13. This subassembly is inserted to a lower fixed cylinder 6 and is fixed by a screw 17. An adjusting screw 16 is turned to adjust finely axial eccentricity, axial fall, and head height. A space is provided between fittingj parts of the cylinder 6 and the housing 15 to adjust freely the eccentric quantity between them.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to V
The present invention relates to a rotating body assembly for rotating equipment such as a video tape recorder (TR).

Generally, there are various types of rotary body assemblies for this type of rotary equipment, and the following explanation will be given by taking a VTR rotary head assembly as an example.

A challenge required of the mechanical parts of a VTR, particularly the rotating head cylinder part, is how to correctly maintain and reproduce the relative speed and position of the head and tape. Among these factors, there are many possible causes of positional deviation, but the main ones are as follows.

■ Eccentricity of the upper rotating cylinder with respect to the lower fixed cylinder ■ Inclination of the upper rotating cylinder with respect to the lower fixed cylinder ■ Misalignment of the absolute height from the lead groove of the lower fixed cylinder to the head The rotating head assembly of a conventional VTR is shown in Figure 1. The structure is as follows (however, the drive motor is not shown). In FIG. 1, 1 is an upper rotating cylinder, 2 is a rotating shaft, and 3 is a flange for directly connecting the rotating cylinder 1 and the rotating shaft 2, and is fixed to the rotating shaft 2 by press fitting or shrink fitting.

Reference numeral 4 denotes a head for recording and reproducing information on a video tape, which is attached to the rotary cylinder 1. 5 is a head adjustment screw for adjusting the relative height between the heads 4. Reference numeral 6 denotes a lower fixed cylinder, and upper and lower ball bearings 9 and 10 are housed in the cylinder 6, and a lead groove 18 for guiding the running of the tape is formed on the outer peripheral surface of the cylinder.
is formed.

Further, 7 and 8 are a rotary side rotary transformer and a stationary side rotary transformer for transmitting, receiving, and amplifying signals from the head 4, respectively, and 12 is a spring for applying preload to the hair ring presser foot 11, which is the end ring. 13 to apply preload. 14 is a screw for fixing the end ring.

In such a cylinder structure, the factors causing the above-mentioned positional deviation have been addressed by improving both processing accuracy and assembly accuracy. However, this method has always had the problem of high required accuracy (and poor yield).

This invention was developed in view of the above-mentioned conventional problems, and while the upper rotating cylinder (first rotating body) is fixed to the end of the rotating shaft, a bearing housing is attached to the outer periphery of the rotating shaft via a bearing. By attaching the lower fixed cylinder (second rotating body) to the bearing housing so that it can be rotated freely, the lower fixed cylinder (second rotating body) is fixed to the bearing housing so that the mounting position can be adjusted. The purpose is to provide a rotating body assembly.

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

FIGS. 2 to 4 show a rotating body assembly of a χ1 rotating device according to an embodiment of the present invention, which is an example applied to a rotating head assembly of a VTR.

In the figure, 1 is an upper rotating cylinder (first rotating body), 2
4 is a rotating shaft, 4 is a head, and 5 is a head adjustment screw. The upper cylinder 1 is connected to the rotating shaft 2 by press-fitting or shrink-fitting, and furthermore, a heel 4 is attached to the upper cylinder 1, and a rotary transformer 7 on the rotating side is connected by a method such as gluing.

Reference numeral 15 denotes a bearing housing. Upper and lower ball bearings 9 and 10 are attached to the housing 15, and the fixed rotary transformer 8 is connected by adhesive or the like. The rotating shaft 2 is inserted into the bearing housing 15 in this state,
A preload is applied to the bearing retainer 11 by a spring 12 positioned by an end ring 13. Third
The figure shows such a subassembly. This is inserted into the lower fixed cylinder (second rotating body) 6 and fixed with a mounting screw 17. Furthermore, 16 is a plurality of screws for finely adjusting shaft eccentricity, shaft inclination, and head height, and 18 is a lead groove formed on the outer peripheral surface of the lower fixed cylinder 6.

Next, the effects will be explained.

In this device, by rotating a plurality of adjustment screws 16, it is possible to finely adjust the amount of inclination of the rotary cylinder 1 with respect to the lower cylinder 6 and the absolute height from the end of the lead 18 of the lower cylinder 6 to the head 4. It is. Also, the lower cylinder 6
A gap is provided between the fitting part of the bearing housing 15 and the bearing housing 15,
It is possible to freely adjust the amount of eccentricity between the lower cylinder 6 and the rotating cylinder 1.

Therefore, with this apparatus, there is no need to maintain high processing accuracy as in the conventional method, and the yield can be significantly improved. Further, as a result of being able to make fine adjustments, assembly accuracy can be further improved compared to conventional devices, and rotation with higher precision is possible.

Further, with this device, the following secondary effects can be obtained in the sub-assembly state shown in FIG. 3.4.

That is, (1) the lead wire 19 can be directly and easily connected between the head 4 and the rotary transformer 7 as shown in FIG.

■ Adjustment of the dimension e of the gap 20 between the rotary transformer 7 on the rotating side and the rotary transformer 8 on the stationary side shown in FIG.
Conventionally, this was impossible to do visually, but this is now possible, and operations such as adjustment and confirmation become easier.

In the above embodiment, the rotary head assembly of a VTR has been described, but the present invention is directed to the first embodiment. The present invention can be similarly applied to rotary body assemblies of rotary equipment in which the second rotary bodies must be rotated independently and with high precision, other than rotary head assemblies of VTRs.

As described above, according to the rotating body assembly for a rotating device according to the present invention, the first rotating body is fixed to the end of the rotating shaft, and the bearing housing is rotatably attached to the outer periphery of the rotating shaft via the bearing. Since the second rotating body is fixed to the bearing housing so that its mounting position can be adjusted, there is no need to maintain high machining accuracy, and the yield can be greatly improved.In addition, assembly accuracy can be improved, making it even more efficient. High-precision rotation becomes possible, and a secondary effect is that work efficiency is improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a typical structure of a rotary head assembly of a conventional VTR, and FIG. 2 is a cross-sectional view of a VTR according to an embodiment of the present invention.
FIG. 3 is a sectional view of a sub-assembly stage of the above assembly, and FIG. 4 is a diagram for explaining the effect of the above assembly. 1... Upper rotating cylinder (first rotating body), 2... Rotating shaft, 4... Head, 6... Lower fixed cylinder (second rotating body) 9. jO...Ball bearing, 15...Bearing housing, 16...Adjustment screw. In the drawings, the same reference numerals indicate the same or equivalent parts. Agent Masuo Odai Higashi I, '1 Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A first rotating body fixed to the end of a rotating shaft in a rotating device, a bearing housing rotatably attached to the outer periphery of the rotating shaft via a bearing, and a mounting position on the outer periphery of the bearing housing. a second rotating body that is adjustable and fixed and rotates integrally with the bearing housing; A rotating body assembly for a rotating device, characterized in that both second rotating bodies are independently rotatable with high precision. (2) The rotating device is a magnetic recording and reproducing device, and the first rotating body is a two-part rotating cylinder that supports the recording and reproducing head, and the second rotating body is a lead groove that guides the running of the video tape. A rotating body assembly for a rotating device according to claim 1, characterized in that it is a lower fixed cylinder having on its outer peripheral surface. +31 The amount of inclination and eccentricity of the upper rotating cylinder with respect to the lower fixed cylinder of the lower fixed cylinder,
3. The rotating body assembly for a rotating device according to claim 2, further comprising a plurality of screws for finely adjusting the absolute height from the end of the lead groove to the head.