JPH03113710A - Rotary head device - Google Patents

Abstract

PURPOSE:To obtain a uniform rate of air blowing over the entire circumference by forming a rotary drum which has a member to constitute the surface facing to a stationary drum and mounting a head on the side opposite from the surface to face the stationary drum. CONSTITUTION:The rotary drum 11 has the member 11a to constitute the surface facing to the stationary drum (not shown). The stepped upper part 11b and stepped lower part 11c thereof are constituted across a part of the member 11a. The base part of a head base 14 is mounted by using a head mounting screw 12 to the stepped upper part 11b. A through-hole is provided between the front end part and root part of the base 14 and a head height adjusting screw 15 is inserted into this hole. The front end of this screw is screwed to the stepped lower part 11c of the member 11a. The base 14 deflects in a direction (b) and the height thereof can be adjusted when the screw 15 is pushed in an arrow (a) direction. Since the surface of the rotary drum 11 facing the stationary drum is plane, the formation of the spiral grooves 17 over the entire circumference of the rear surface is possible. Since the grooves 17 are formed over the entire circumference of the rear surface in this way, the air blowing uniform over the entire circumference is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head device suitable for use in, for example, a video tape recorder (VTR).

[Summary of the invention]

The present invention includes a first drum having spiral grooves, a second drum having a flat surface facing the first drum, and rotating one of the first and second drums. In a rotating head device having a drum, the other being a fixed drum, and a head disposed on the rotating drum, the rotating drum has a member forming a surface facing the fixed drum, and the head faces the fixed drum at the member. The head is mounted on the opposite side to the surface, and the head is attached to the tip of the base member, and the head is mounted to the above member via the base member, and the head is attached between the tip and base of the base member. By arranging an adjusting means for adjusting the height of the head, the spiral groove of the first drum can be provided over the entire circumference, and the height of the head can be adjusted in the drum assembly state as in the conventional method. This can be done with high precision by pushing the screw in from above.

[Conventional technology]

Conventionally, in a VTR using a rotating head drum, opposing surfaces with a slight clearance are provided between the fixed drum and the rotating drum, and a pump-out spiral groove is formed on one surface to reduce the gap between the two drums. There is a method of floating the tape by blowing air from the
(See No. 3).

In this case, the conventional helad mount was performed as shown in FIG. That is, the rotating drum (1), which is the upper drum, is turned upside down and attached to a mounting machine (not shown).
Attach the head tip (3) to the tip of the head mounting screw (2).
) to fix the attached head base (4). After that, attach the rotating drum (1) to the flange, etc. (not shown) of the lower drum assembly, and push in the head height adjustment screw (push screw) (5) with the so-called drum assembly state, and then attach the head base (4). is pressed from above to elastically deform the head base (4) (displace it downward) and perform height adjustment (bearing adjustment). In addition, with this head mount method, the head chip (3)
The head window formed nearby is generally called a normal window (6).

[Problem to be solved by the invention]

By the way, in the case of the conventional head mount system as described above, the head must be attached to the lower surface of the rotating drum (1), so the spiral groove ( It is necessary to cut out a part of 7). Therefore, the spiral groove (7) in this part becomes discontinuous, and as a result, the amount of air blown out becomes discontinuous and non-uniform, resulting in problems such as the inability to freely control the air blown out.

As a method for controlling the amount of air blown around the head, Japanese Patent Laid-Open No. 60-50736 and Japanese Patent Laid-open No. 6
There is a method as described in Japanese Patent No. 0-50737, but since there is basically only a notch in the spiral groove, it is inevitable that the amount of air blown out will be non-uniform.

As a method to solve this problem, a so-called mounting method may be considered in which the head is attached from the top surface of the rotating drum (1). In this case, a spiral groove (7) can be freely formed on the entire circumference of the lower surface of the rotating drum (1).

However, when using the above-mentioned top mount method, there is a problem in that the head height cannot be adjusted in the conventional manner.

This invention was made to solve this problem, and allows spiral grooves to be formed freely over the entire circumference of the bottom surface of the drum without cutting out them. It is an object of the present invention to provide a rotary head device that can adjust the head height with higher accuracy.

[Means to solve the problem]

A rotary head device according to the present invention includes: a first drum having a spiral groove; a second drum having a flat surface facing the first drum; One of the drums is a rotating drum (11) and the other is a fixed drum, and a head (11) is installed on the rotating drum.
3, 14), wherein the rotating drum has a member (lla) that constitutes a surface facing the fixed drum, and the head has a member (lla) that constitutes a surface opposite the fixed drum in the member. It is designed to be mounted on the side.

Further, the head (13) is attached to the tip of the base member (14).
) is attached and mounted on the member (lla) via the base member, and adjusting means (15, 18) for adjusting the height of the head between the tip and base of the base member. ).

[Effect]

The heads (13, 14) are mounted on the opposite side of the member (lla) of the rotating drum (11), which constitutes the surface facing the fixed drum. As a result, a spiral groove can be provided over the entire circumference of the surface of the rotating drum that faces the fixed drum, and a uniform amount of air can be blown out over the entire circumference. In addition, in the above-mentioned method of mounting the head (top mounting method), an adjustment means (15° 1 day) for adjusting the height of the head is provided between the tip and the base of the base member (14) to which the head is attached. establish. As a result, even in the top mount system, the head height can be adjusted with high precision by pushing in screws from above while the drum assembly is in place, as in the past.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1 to 6.

1 to 4 show a first embodiment of this invention,
FIG. 1 is a configuration diagram thereof, FIG. 2 is a plan view thereof, FIG. 3 is a diagram showing a bent state of the helad base, and FIG. 4 is a diagram showing a state of the lower surface of the rotating drum.

In each figure, (11) is a rotating drum, and this rotating drum (11) has a member (lla) constituting a surface facing a fixed drum (not shown). This member (ll
Cut one part of a) to create the upper part (llb) and lower part (llc).
). Attach the head mounting screw (1
2) to attach the base of the head base (14). At the tip of the head base (14) is a helad tip (1
3) is installed. A through hole is provided between the tip and base of the head base (14), and a head height adjustment screw (15) with a head is passed through the hole, so that the tip of the head height adjusting screw (15) is inserted into the member (lla).
) to be screwed together with the lower part (llc) of the step.

By pushing this screw (15) in the direction of arrow a as shown in Figure 3, the head base (14) is deflected, or elastically deformed, as if moving in the direction of arrow A, and the head chip (13) is moved downward. Its height can be adjusted by displacement. (16) is an isolated window as a head window formed near the Herad tip (13), and the formation of this isolated window (16) makes it possible to obtain good head contact.

In this embodiment, the entire surface of the rotating drum (11) facing the fixed drum is flat, so the lower surface has spiral grooves (17
) can be formed. In this way, in this example, the rotating drum (
11) Spiral groove (17) all around the bottom surface
This allows uniform air to be blown out over the entire circumference. Further, the degree of freedom in setting the grooves is increased, for example, the amount of air blown around the head can be easily varied, and an optimal tent-shaped air film can be formed. Furthermore, despite the top mounting method, the head height can be adjusted with high precision by pushing in screws from above while the drum assembly is in place, as in the past.

5 and 6 show a second embodiment of the present invention, FIG. 5 is a configuration diagram thereof, and FIG. 6 is a diagram showing a bent state of the helad base. In addition, in FIGS. 5 and 6, parts corresponding to those in FIGS. 1 to 4 are designated by the same reference numerals.
A detailed explanation thereof will be omitted.

In this embodiment, a set screw (18) is used as the head height adjustment screw as in the conventional case. A tap is cut between the tip and base of the head base (14) into which this push screw (1 day) is screwed, and the tip of the push screw (18) is connected to the rotating drum (1 day).
It is in contact with the counterbore surface, that is, the step lower part (llc) which escapes the head chip (13) of 1). In this state, when the set screw (18) is pushed in the direction of arrow C as shown in Fig. 6, the tip of the head base (14) is elastically deformed upward as shown by arrow d, and the height of the head chip (13) is increased. Its height can be adjusted by moving it upwards.

In this case as well, since the surface of the rotating drum (11) facing the fixed drum is flat over the entire area, a spiral groove (17) can be formed on the lower surface over the entire circumference as shown in FIG.

In this way, substantially the same effects as in the first embodiment can be obtained in this embodiment as well.

In addition, although the above-mentioned example is a case in which a spiral groove is provided on the rotating drum serving as the upper drum, it is also possible to provide a spiral groove in a fixed drum serving as the lower drum.
This invention is similarly applicable.

〔Effect of the invention〕

As explained above, this invention has a simple structure in which the head is mounted on the opposite side of the member that constitutes the surface of the rotating drum that faces the fixed drum. It is possible to provide a groove in the shape of a shape, and a uniform amount of air can be blown out over the entire circumference. Furthermore, despite the top mount system, the head height can be adjusted with high precision by pushing in screws from above while the drum is assembled, as in the past.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an explanatory diagram of the main parts thereof, and FIG. 4 is a diagram showing the shape of the lower surface of the rotating drum according to the present invention. FIG. 5 is a configuration diagram showing a second embodiment of the invention, FIG. 6 is an explanatory diagram thereof,
FIG. 7 is a configuration diagram showing a conventional example, and FIG. 8 is a diagram showing the lower surface shape of a rotating drum according to the conventional example. (11) is a rotating drum, (lla) is a member, (12)
is the head mounting screw, (13) is the head chip, (14)
is the head base, and (15) and (18) are head height adjustment screws. Agent Hidemori Matsukuma

Claims (1)

[Scope of Claims] 1. A first drum having a spiral groove, a second drum having a flat surface facing the first drum, and a second drum having a flat surface facing the first drum; In a rotating head device having one of the drums as a rotating drum and the other as a fixed drum and a head disposed on the rotating drum, the rotating drum has a member that constitutes a surface facing the fixed drum, A rotary head device characterized in that the head is mounted on a side of the member opposite to a surface facing the fixed drum. 2. The head is attached to the tip of the base member and is mounted on the member via the base member, and the height of the head is adjusted between the tip and the base of the base member. The rotary head device according to claim 1, further comprising adjustment means.