JPH01279403A - Rotary head drum device - Google Patents

Abstract

PURPOSE:To lower the height of part of a drum device and to increase the degree of freedom of the arrangement by giving a notch of a stator of a 2nd rotary transformer and forming the winding to be nearly a semi-circle. CONSTITUTION:Part of the stator 22A of the 2nd rotary transformer 22 is notched to be formed to be nearly a semi-circle and supported by a support member 30 at its end. Then the winding of the stator 22A is formed to be nearly a semi-circle around a drum shaft 14 and a signal is sent/received with the rotor 22B. Since part of the stator 22A is notched in this way, the height of the part of the drum device is lowered, and even with the 2nd rotary transformer 22 mounted to the upper part. The drum device is applicable to a VTR of structure where part of the rotary drum enters a cassette mouse of a tape cassette after tape loading thereby increasing the degree of freedom of the arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head drum device, and more particularly to a rotary head drum device in which a rotary transformer provided in the rotary head drum device is improved.

[Conventional technology]

Conventionally, Hi-F 1VTR, 9-head VTR, etc. have a large number of heads, and the number of channels of the rotary transformer is also large according to the number of heads. In addition to the rotary transformer, there is a rotating head drum device with another rotary transformer mounted on top of the rotating drum.

On the other hand, in order to reduce the size of the VTR, a movable chassis was provided that could move forward and backward relative to the fixed chassis on which the rotating head drum etc. were installed, and a pair of reel stands for tape winding and supply were provided on this movable chassis. There is a device designed to do so (Japanese Patent Laid-Open No. 61-271648).

In other words, the tape cassette is attached/detached at a position where the movable yarn is retreated from the fixed chassis, and during recording and playback, the movable member located in the cassette mouth of the tape cassette is moved along a predetermined path, and the movable yarn is moved toward the rotating head drum. By moving the tape cassette forward, the tape inside the tape cassette is pulled out and wound onto the rotating head drum. After the tape loading is completed, a part of the rotating head drum is placed into the cassette mouth portion of the tape cassette. ing.

Therefore, the VTR having the above structure can reduce the distance between the rotating head drum and the pair of reel stands (tape cassettes).

[Problem that the invention seeks to solve]

However, the rotating head drum device in which another rotary transformer is mounted on the top of the rotating drum has a high height, so it is not suitable for VTRs etc. that are configured so that a part of the drum enters the cassette mouth. The problem was that I couldn't do it.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary head drum device in which the height of a portion of the rotary head drum device can be reduced.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a concentric winding system which is disposed on the rotating drum side to which the head chip is attached, and which has at least one channel or more centered around the drum shaft. A rotor part of a rotary transformer having a wire, and a stator part of a rotary transformer having a winding that faces the rotor part and is mounted so as not to rotate with respect to the chassis and sends and receives signals to and from the rotor part. The rotary head drum device is characterized in that a part of the stator portion of the rotary transformer is cut out, and the winding thereof is formed into a substantially semicircular shape centered on the drum shaft.

[Effect]

According to the present invention, a portion of the stator portion of the rotary transformer provided in the rotary head drum device is cut out, thereby reducing the height of the portion of the device. -'The winding, which is normally wound around the stator portion in a circular shape, is made into a substantially semicircular shape with the drum shaft at the center.

〔Example〕

Preferred embodiments of the rotary head drum device according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view of a rotary head drum device according to the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1.

As shown in these drawings, this rotating head drum device is mainly composed of a fixed drum 10, a rotating drum 20, and a holding member 30.

The stator portion 12Δ of the first rotary transformer 12 is disposed on the fixed drum 10, and a bearing 16.16 of the drum shaft 14 is disposed thereon. This fixed drum 10 is fixed to the chassis via a drum stand (not shown).

A flange member 18 is fitted onto the drum shaft 14, and the drum shaft 14 extends through the stationary drum 10 and is rotatably supported by bearings 16.16.

A rotary drum 20 is fitted into the flange member 18, and a rotor portion 12B of the first rotary transformer 12 and a rotor portion of the second rotary transformer 22 are located on the lower surface side and the upper surface side of the rotary drum 20, respectively. 22B is arranged.

A head chip 24 is attached to the outer periphery of the rotating drum 20, and this head chip 24 is connected to the rotor portions 12B of the first and second rotary transformers via a relay board 26.
It is electrically connected to the winding of the corresponding channel of 22B. Note that the first and second rotary transformers are
As shown in the figure, each head chip has four channels of windings arranged on concentric circles, and thus a total of eight head chips are disposed.

A stator section of a drum motor (not shown) is disposed on the lower surface of the fixed drum 10, and a rotor section of the drum motor is disposed on the drum shaft 14.
At the same time, the rotary drum 20 rotates one foot.

The holding member 30 is fixed on a chassis (not shown) and is attached to the stator if'B22Δ of the second rotary transformer 22.
are mutually supported in a cantilever manner with the rotor portion 22B.

Here, the stator section 22A of the second rotary transformer
As shown in FIG. 1, a portion thereof is cut out, and the planar shape is approximately semicircular.

Furthermore, the windings of the stator section 22A, which transmit and receive signals between the rotor section 22B and the concentric windings centered on the drum shaft 14 on the loaf section 22B, are also centered on the drum shaft 14. It is wound approximately in a semicircular shape. Note that a portion of the winding wire around the stator portion 221 passes through the upper surface of the stake B22A. Further, the windings of each channel passing through the upper surface of the stator B22A are wound at appropriate intervals to prevent crosstalk between the channels.

According to the rotary head drum device having the above configuration, since a portion of the stator portion 22A of the second rotary transformer 22 is cut out, the height of a portion of the rotary head drum device can be reduced. Therefore, even if the rotary head drum device has a rotary transformer mounted on the upper part of the rotary drum, it is applicable to a VTR configured such that a part of the rotary head drum device enters into the cassette mouth section of the tape cassette after tape loading is completed. be able to. Of course, not only can this be applied to the above-mentioned VTR, but even if interference with other components is a problem due to the layout of the rotary head drum device, such interference can be avoided by applying this rotary head drum device. becomes possible.

FIG. 3 is a plan view showing a second embodiment of the rotary head drum device according to the present invention, and FIG. 4 is a sectional view taken along line BB in FIG. 3. Incidentally, members common to those of the rotary head drum device of the first embodiment shown in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted.

The rotary head drum device of the first embodiment and the rotary head drum device of the second embodiment differ in the way in which the stake portion of the second rotary transformer is supported. In contrast, the second embodiment employs another supporting method.

That is, as shown in FIGS. 3 and 4, the holding member 40 has a stake portion 22A of the second rotary transformer 22.
A bearing 42.42 is also provided, and the holding member 40 is rotatably inserted into the drum shaft 14 via the bearing 42.42. still,
Reference numeral 44 denotes a stopper that prevents the holding member 40 from moving in the axial direction of the drum shaft 14.

Further, the rotation preventing member 50 is formed of, for example, a sheet metal member, and includes two arm portions 50A that sandwich the holding member 40.
, 50A. This rotation prevention member 50
is fixed onto a fixed member such as a chassis or a drum stand by a screw 52, and prevents rotation of the holding member 40 by its arm portions 50A, 50A.

The stator portion 22A and the holding member 40 of the second rotary transformer 22 are formed so that the planar shape thereof is approximately semicircular, and the stator portion 22A and the holding member 40 of the second rotary transformer 22 are formed so as to have a substantially semicircular planar shape. The height of the section can be lowered.

According to the method for supporting the stator section 22A of the second embodiment, since the holding member 40 is inserted through the drum shaft 14, the stator section 22A of the second rotary transformer 22 disposed on the lower surface of the holding member 40 is attached to the rotating drum. 20 can be positioned with high precision with respect to the upper rotor portion 22B.

〔Effect of the invention〕

As explained above, according to the rotary head drum device according to the present invention, the stator portion of the rotary transformer provided in the rotary head drum device is partially cut out. The height of the rotary head drum device can be reduced, which allows the V
The degree of freedom in application to TR, arrangement, etc. is increased.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a rotating head drum device according to the present invention, FIG. 2 is a sectional view taken along line A-Δ in FIG. 1, and FIG. 3 is a plan view showing an embodiment of a rotating head drum device according to the present invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. 10... Fixed drum, 12... First rotary transformer, 12A, 22A... Stator section,
12B, 22B...Rotor i, 14...Drum shaft, 20...Rotating drum, 22...
2nd rotary transformer, 24...Head chip, 30.40...Holding portion, 50...Rotation blocking member.

Claims (1)

[Claims] Disposed on the rotating drum side to which the head chip is attached,
A rotor part of a rotary transformer having concentric windings centered on a drum shaft of at least one channel, and a rotor part that faces the rotor part and is mounted so as not to rotate with respect to the chassis. In a rotary head drum device comprising a stator section of a rotary transformer having a winding for transmitting and receiving signals, a part of the stator section of the rotary transformer is cut out, and the winding is cut out approximately half way around the drum shaft. A rotating head drum device characterized by having a circular shape.