JPS59113502A - Tape guide drum device - Google Patents

Abstract

PURPOSE:To receive the pressure and the impact applied from above by a disc and to prevent them from having the influence upon a rotating side transformer element even if they are applied from above when a rotary drum is placed on the disc, by constituting the device so that the second connecting means which has an electric conduction relation to the winding of the rotating side transformer element is held by the disc. CONSTITUTION:A disc 28 holding the second connecting means 25 which fixes and holds a rotating side transformer element 26 is supported freely rotatably on a fixed drum 31 through a main shaft 27 and a bearing 30. In this case, the rotating side transformer element 26 and a fixed side transformer element 29 are allowed to face with each other with a preliminarily set space between them. When a rotary drum 24 is placed on the disc 28, a connector means 23a of the first connecting means 23 and a conductive pin 25a of the second connecting means 25 are fitted to each other, and a winding on a rotary video head 21 and a winding on the rotating side transformer element 26 are connected electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tape guide drum device used in a video tape recorder.

Conventional Structure and Problems High dimensional accuracy has been required of each member of a tape guide drum device. Furthermore, high accuracy is required for the set value of the gap between each member.

In particular, regarding the set value of the air gap between the rotating transformer element and the fixed transformer element, special precision has been required since signals from a one-rotation video head are exchanged.

Hereinafter, a conventional tape guide drum device will be described with reference to the drawings.

FIG. 1 is a partial side sectional view of a conventional tape guide drum device. In the figure, 1 is a rotating video head, and 2 is an electrical connection between the winding of the rotating video head 1 and a first connecting means 3, which will be described later. This is a lead wire that establishes a conductive relationship. Reference numeral 3 designates a first connection means constituted by a substrate made of an electrically insulating material and a connector means 3a made of a conductive material fixed to the substrate.

Reference numeral 4 denotes a rotating drum that holds the rotating video head 1 and the first connecting means 3. Reference numeral 5 designates a second connecting means comprised of a conductive pin 5a that is electrically connected to a winding formed on a rotating transformer element 6, which will be described later, and a holding member 6b thereof.

Reference numeral 6 denotes a planarly opposed rotating side transformer element which firmly holds the second connecting means 5.

7 is a main shaft, and 8 is a disk that fits and supports the main shaft 7 and firmly holds the rotating transformer element 6 on the same axis.

Reference numeral 9 denotes a fixed transformer element of a plane-opposed type, 1o a bearing that rotatably supports the main shaft 7, and 11 a fixed transformer element 9.
A fixed drum holding the bearing 1o coaxially and holding the bearing 1o,
A preload boss 12 is held on the main shaft T, contacts the inner ring of the bearing 10, and applies preload.

The operation of the conventional tape guide drum device configured as described above will be described below.

A disk 8 that firmly holds the rotating transformer element 6 is rotatably supported by a fixed drum 11 via a main shaft 7. At this time, the rotating side transformer element 6 and the stationary side transformer element 9 are opposed to each other with a preset gap.

Next, when the rotating drum 4 is placed on the disk 8, the connector means 3a of the first connecting means 3 and the conductive pins 5a of the second connecting means 5 fit together, and the conductive pins 5a of the second connecting means 5 are connected to the rotating video head 1. The windings provided on the rotating transformer element 6 are electrically connected to each other.

However, in the above configuration.

When placing the rotating drum on the disk, if the connector means 3a of the first connecting means 3 and the conductive pin 5a of the second connecting means 6 are not fitted well, the conductive pin 5a
Pressure and shock are applied from above.

That is, pressure is applied directly to the rotating side transformer element 6 from above,
There will be a shock. As a result, there is a problem that the gap between the rotating side transformer element 6 and the stationary side transformer element 9 becomes narrower than the setting, or in the worst case, the row 7 Lee transformer unit is destroyed.

OBJECT OF THE INVENTION The object of the present invention is to provide a method for mounting a rotating drum on a disk.
Windings applied to the rotating video head without any effect on the rotating transformer element.

It is an object of the present invention to provide a tape guide drum device having a connection means for electrically conducting windings provided on a rotating side transformer element.

Structure of the Invention The tape guide drum device of the present invention comprises: a rotating drum holding a rotating video head; a fixed drum located coaxially with the rotating drum; and a disk on which the rotating drum is removably mounted coaxially. A pair of rotary transformer units comprising a fixed-side transformer element and a rotating-side transformer element that transmit and receive signals from the rotating video head, and a first connecting member that is electrically connected to a winding provided on the rotating video head. and a second connecting member that is electrically conductive with the winding provided on the rotating transformer element,
By holding the first connecting member on the rotating drum, holding the second connecting member on the disk, and placing the rotating drum on the disk, the first connecting member and the It is configured to be electrically conductive with the second connecting member, so that when the rotating drum is placed on the disk, the rotating video head can be connected to the rotating video head without affecting the rotating transformer element in any way. It is possible to electrically conduct the windings applied to the transformer element and the windings applied to the rotating transformer element.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a partial side sectional view of a tape guide drum device according to an embodiment of the present invention. In Figure 2,
21 is a rotating video head, 22 is a lead wire thereof, 23 is a first connection means, 24 is a rotating drum, 26 is a rotating transformer element, 27 is a main shaft, 28 is a disk, 29 is a stationary transformer element 3o is a bearing, 31 is a fixed drum, and 32 is a preload boss, which are essentially the same as those shown in FIG.

A second connecting means 26 is held by the disk 28 so as to firmly hold the rotating transformer element 26 and to position the disk 28 and the rotating transformer element 26 coaxially.

The operation of the tape guide drum device according to the embodiment of the present invention constructed as described above will be described below.

The disk 28 holding the second connecting means 26 which fixedly holds the rotating side transformer element 26 is connected to the main shaft 27 and the bearing 3.
It is rotatably supported by the fixed drum 31 via o.

In this case, the rotating side transformer element 26 and the stationary side transformer element 29 are opposed to each other with a preset gap.

Next, when the rotating drum 24 is placed on the disk 28, the connector means 23a of the first connecting means 23 and the conductive pins 25& of the second connecting means 26 fit together, and the conductive pins 25& are applied to the rotating video end 21. The windings provided on the rotating transformer element 26 are electrically connected to each other.

As described above, according to this embodiment, the second connecting means 25 is not held by the rotating transformer element 26, and the disk 28
By holding the rotating drum 2 on the disk 28,
4 without any influence on the rotating side transformer element 26.

This provides a connection means for electrically connecting the windings applied to the rotating video head 21 and the windings applied to the rotating transformer element 26.

In the above-described embodiment, the pair of rotary transformers A may be rotary transformers that face each other in a plane, and the rotary transformer unit may be a cylindrical, circumferentially opposed rotary transformer unit. Further, in the above-described embodiment, a connector is used as the first connection means, but a printed circuit board may be used as the first connection means and the conductive pins of the second connection means may be soldered. Needless to say.

Effects of the Invention As is clear from the above description, the present invention is configured such that the second connecting means that is electrically connected to the windings provided on the rotating side transformer element is held by the disk. , when placing the rotating drum on the disk, even if the first
Even if the connecting means and the second connecting means do not fit together well and pressure or impact is applied from above to the second connecting means, the disk will receive the force, so it will have no effect on the rotating transformer element. This provides an excellent effect in that the set value of the air gap between the rotating transformer element and the stationary transformer element does not change at all.

[Brief explanation of drawings]

FIG. 1 is a partial side sectional view of a conventional tape guide drum device, and FIG. 2 is a partial side sectional view of a tape guide drum device according to an embodiment of the present invention. 21...Rotating video head, 22...
Lead. 23...First connection means, 23a...
Connector means, 24...Rotating drum, 25.
...Second connection means, 25a...Conductive pin, 26...Rotating side transformer element, 27...
...Main shaft, 28...Disk, 29...
... Fixed side - lance element, 30 ... Bearing, 31
...Fixed drum. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A rotating drum that holds a rotating video head, a fixed drum located coaxially with the rotating drum, a disk on which the rotating drum is coaxially and removably mounted, and a fixed transformer that sends and receives signals from the rotating video head. a pair of rotary transformer units comprising a rotary transformer element and a rotary transformer element, a first connecting member that is electrically connected to a winding formed on the rotary video head, and a winding formed on the rotary transformer element. a second connecting member in electrical continuity with the wire, the first connecting member being held by the rotating drum, the second connecting member being held by the disk, and the rotating drum being held by the rotating drum. A tape guide drum device, characterized in that the first connecting member and the second connecting member are configured to be electrically connected when placed on a disk.