JPS6022409B2 - Cylinder alignment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder alignment device for aligning an upper cylinder and a lower cylinder of a video tape recorder.

In Fig. 1 showing the conventional one, 1 is the upper cylinder;
The connector 2 is fixed to the lower cylinder 3 in the same manner.

4 is a rotating disk, on which a rotating magnetic head 5 is fixed.

6 is a disc with a ball bearing 7 in the lower cylinder 3
is fixed to a rotating shaft 7 rotatably supported via A,
It rotates together with the rotating shaft 7.

The rotating disk 4 is screwed to the rotating disk 6, and when replacing the rotating magnetic head 5, these screws are removed and the rotating disk 4 is replaced.In the cylinder of the conventional device described above, the upper The concentricity between the cylinder 1 and the lower cylinder 3 is determined by the processing accuracy and installation accuracy of the connector 2.

However, the connector 2 has a cylindrical shape cut along a plane parallel to the center ball, and it is difficult to improve the machining accuracy. Further, since the contact area of the connector 2 with the cylinder cannot be increased in order to wrap the magnetic tape, the concentricity may change if the connector 2 is reattached.
For this reason, in the conventional example, a spacer is interposed between the connector 2 and the upper cylinder 1 or the lower cylinder 3 for alignment. In this case, the same 0 degrees will vary slightly depending on the location of the base and the mounting method, resulting in a very large amount of adjustment man-hours and poor mounting reproducibility. SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder alignment device that allows alignment of an upper cylinder and a lower cylinder to be performed easily and accurately. In the present invention, the rotating disk that is attached to the rotating shaft supported by the lower cylinder and fixing the rotating disk on which the rotating magnetic head is attached is iron-coupled with the inner flange portion, and the outer light portion is iron-coupled with the inner diameter of the upper cylinder. They are aligned using an alignment jig, and then fixed by a screw threaded in the direction of the cylinder via a lower connector fixed to the lower cylinder and an upper connector fixed to the upper cylinder.

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

The same parts as the subordinates are indicated by the same symbols. In Fig. 2, 8 is an alignment sensor, and the inner diameter and outer diameter are precisely manufactured to have the same 0 degrees.The inner diameter is iron-fitted to the outer periphery of the disk 6, and the outer diameter is the upper cylinder 1. It is iron-plated on the inner diameter of.
The upper cylinder 1 has a substantially cylindrical shape, and it is relatively easy to make the inner flange and outer diameter the same 0 degrees. In addition, a rotating plate 4 is iron-plated on the outer periphery of the disk 6, and since it is necessary to detect forgeries between the two rotating magnetic heads 5,
The concentricity of the outer periphery of the disk 6 with respect to the lower cylinder 3 is extremely good. Therefore, by using the alignment jig 8, the lower cylinder 3 and the upper cylinder 1 can be aligned with high accuracy. A lower connector 9 is fixed to the lower cylinder 3, and the upper surface of the lower connector 9 is perpendicular to the rotation axis.

An upper connector IQ having a smooth lower surface is fixed to the upper cylinder 1', and the upper cylinder main surface is machined perpendicularly to the cylinder center axis. In Fig. 2, the direction in which the lower connector 9 and the upper connector 0 are screwed together is approximately parallel to the cylinder axis, and the alignment jig 81 disturbs the alignment between the lower cylinder 3 and the lower cylinder. As is clear from the above, the processing accuracy required for the upper connector is only the flatness of the lower surface. It is sufficient to fix it to the lower cylinder 3 in a state perpendicular to the axis, for example, by gluing, thereby eliminating the need for severe processing precision.

Also, as is clear from FIG. 2, when replacing the head, remove the screw 11 and replace the rotating disk 4, then insert the alignment jig 8 and fasten the upper cylinder with the screw 11. All operations can be performed from the top of the set, and the operability (serviceability) is extremely good.In addition, if the upper surface of the lower connector 9 is not perpendicular to the rotation axis 7,
Alternatively, if the upper surface of the upper cylinder is not perpendicular to the center axis, as shown in Figure 2, without fixing the upper connector 0 and the upper cylinder, insert the aligner 8 and tighten the screw 1, then harden. The upper connector turtle 0 and the upper cylinder 1 may be bonded together using an adhesive that does not change in volume over time. In this case, if you use the alignment jig 8, you can remove the screw 11 and
After disassembly, even if the paper is put up again, the original state is reproduced, so the accuracy of the upper cylinder 1 and the lower cylinder 3 is maintained. Third
The figures show other embodiments.

The difference from the above embodiment is that the alignment jig 8 is fitted to a portion of the disk 6 that has a smaller diameter than the portion of the disk 6 that fits with the rotating disk 4. It is easy to machine this small and light part in the same manner as the iron fitting part between the rotating disk 4 and the disk 6. Therefore, as in the above embodiment, the upper cylinder 1 and the lower cylinder 3 can be aligned using the alignment pick 8. In order to accurately index the position of the rotating magnetic head 5 fixed to the rotating disk 4 without any adjustment when replacing the head, it is necessary to minimize the gap between the iron fitting between the rotating disk turtle and the disk 6. It won't happen. This makes it difficult to squeeze the rotating disk 4 and disk 6 together. However, as in this embodiment, by making the diameter of the joint portion of the alignment control 8 with respect to the disk 6 small, it becomes easy to attach and remove the joint between the rotary disk turtle and the disk 6. Furthermore, when removing the rotary disk 4, if the alignment fitting 8 and the rotating disk 4 are screwed together in an appropriate manner and the tube alignment fitting 8 is removed, the rotating disk 4 can be attached to the rotating shaft 7. It can be pulled out in parallel. As shown above, it is extremely easy to align the upper and lower cylinders, and when the upper and lower cylinders are fixed together via a connector, a force that disturbs the alignment is applied. It can be fixed accurately without any problems.

In addition, machining is easy and the number of machining parts that require high precision is reduced. As described above, the cylinder alignment device of the present invention has the effect that alignment work can be easily performed with high accuracy.

[Brief explanation of the drawing]

FIG. 2 is a sectional view of a conventional cylinder alignment device, and FIG. 2 is a sectional view of an embodiment of the cylinder alignment device of the present invention.
FIG. 3 is a sectional view of another embodiment of the cylinder alignment device of the present invention. Turtle...Upper cylinder ~ 3...Lower cylinder, 4...Rotating disk, 5...Rotating magnetic head, 6...Disk, 7...Rotating shaft, 8... 9...Lower connector, 10...Upper connector.
O Prisoner O 2 Mother is 3 Wind

Claims (1)

[Claims] 1. In the helical scan method in which the upper and lower cylinders are aligned and fixed via a connector, and in the alignment device for the cylinder part of a video tape recorder, a rotating circle attached to a rotating shaft supported by the lower cylinder and to which a magnetic head is attached. A rotary disk to which the plates are fitted and fixed, has a diameter equal to or smaller than the diameter on which the rotary disk is fitted, is longer than the thickness of the rotary disk, and extends concentrically with the rotation axis. A cylindrical alignment jig is provided in which the extension part and the inner diameter part of the rotary disk fit together, and the inner diameter and outer diameter part provided concentrically with the outer periphery of the upper cylinder fit together. A cylinder alignment device characterized by aligning and fixing upper and lower cylinders.