JPH0110747Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a rotating head cylinder device for a VTR.
In particular, it relates to means for adjusting the amount of protrusion of the head.

FIG. 1 is a sectional view showing the structure of a conventional rotating head cylinder device. The amount of protrusion d of the head 3 with respect to the circumference of the upper cylinder 1 is set to about several tens of micrometers, but since this amount of protrusion slightly changes the degree of contact with the magnetic tape, it also has a large effect on the image. Therefore, it is necessary to finely adjust the amount of protrusion, and since the adjustment is several tens of micrometers, it has been desired to be able to make fine adjustments reliably.
The conventional adjustment method is explained in Fig. 1 by inserting a screwdriver etc. into a hole 1' drilled in the upper cylinder 1.
The end face 4' of the head base 4 was forced to protrude. However, it is difficult to make fine adjustments by prying with a screwdriver, and it is easy to over-protrude.
It took time to work. In the figure, 2 is a lower cylinder, and 5 is a head height adjustment screw that is installed in a screw hole that passes through the upper cylinder 1 in the axial direction.
The height can be adjusted. Further, 6 indicates a mounting screw. Further, in recent years, the diameter of cylinders has become smaller, and with the conventional method, there is no room for the upper cylinder itself, and it is becoming impossible to make the hole 1' in the upper cylinder 1.

Therefore, an object of the present invention is to provide a head protrusion adjustment means that allows easy fine adjustment of the head protrusion amount without requiring a special hole for adjusting the head protrusion amount. An object of the present invention is to provide a rotary head cylinder device.

In order to achieve the above object, the rotating head/cylinder device according to the present invention includes a head height adjustment screw installed in a screw hole penetrating in the axial direction of the rotation cylinder, and a head fixed to the head height adjustment screw at the tip of the head height adjustment screw. a head base attached to the rotary cylinder so as to be able to come into contact with the rotary cylinder; characterized in that a groove is provided on the head base opposite to the screw hole and a hole is formed that passes through the screw in the axial direction.

The present invention will be explained in more detail below using examples with reference to the drawings, but these are merely illustrative, and it goes without saying that various modifications and improvements may be made without going beyond the scope of the present invention. It is.

FIG. 2 is a sectional view of a rotary head cylinder device according to one embodiment of the present invention, and FIG. 3 is a perspective view of a head base used in the device shown in FIG. The head base 4 is provided with a groove 4'' as shown in FIG. 3. The head 3 is fixed to the head base 4. As shown in FIG. A hole 4 is passed through the upper drum 1 and temporarily fixed with a screw 6. This groove 4'' is set to be located near a hole 5' provided in the head height adjustment screw 5. Next, insert an eccentric driver 8 as shown in Fig. 4 into the hole 5' and drop the protrusion 8' into the groove 4''.Then, by rotating the eccentric driver, the head will protrude due to the principle of a screw. Furthermore, since it is a rotary driver, fine adjustment can be made even easier by increasing the diameter of the grip 8''.

FIG. 5 is a sectional view of a rotary head cylinder device according to another embodiment of the present invention, in which a donut-shaped seat plate 7 is inserted under the head height adjustment screw 5. There is. By inserting this, the displacement of the head base when the screw 5 is rotated can be reduced.

If the projection is made before installing the height adjustment screw 5, there is no need to make a hole 5' in the screw 5, but after adjusting the height, the projection cannot be adjusted again. It is also possible to do this in a conventional manner without using a jig as shown in FIG. 4, but in this case, a simple hole may be used instead of a 4" groove.

As explained above, according to the present invention, the amount of protrusion of the head can be easily adjusted by simply machining the height adjustment screw and the head base without requiring any special holes for adjusting the amount of protrusion of the head. The advantage is that fine adjustment is possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of a conventional rotary head cylinder device, FIG. 2 is a cross-sectional view of a rotary head cylinder device according to an embodiment of the present invention, and FIG.
The figures are a perspective view of a head base used in the device shown in FIG. 2, FIG. 4 is a perspective view of an eccentric driver used in the device of the invention, and FIG. 5 is a perspective view of another implementation of the invention. 1 is a cross-sectional view of a rotating head cylinder device according to an embodiment; FIG. 1... Upper cylinder, 1'... Hole drilled in the upper cylinder, 2... Lower cylinder, 3... Head, 4
...Head base, 4'...End face of head base, 4"...Groove, 4...Hole for mounting screw, 5...Head height adjustment screw, 5'...Head height adjustment screw Hole provided in 6...Mounting screw, 7...Seat plate, 8...Eccentric driver, 8'...
Protrusion, 8″...Grip.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A head height adjustment screw installed in a screw hole penetrating in the axial direction of a rotating cylinder, and a head that is fixed so that it can come into contact with the tip of the head height adjustment screw. a head base attached to the rotary cylinder; a rotary head cylinder comprising: a groove on the head base facing the screw hole; and a hole penetrating the head height adjusting screw in the axial direction. Device. (2) The rotating head cylinder device according to claim 1, which is characterized by having a ring-shaped seat plate between the head height adjusting screw and the head base.