JPH06101103B2 - Recorder drum device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recorder drum device in a recording and / or reproducing device such as a video tape recorder or a digital audio tape recorder.

[Background of the Invention]

As shown in FIG. 2, bearings 104 and 105 having an inner ring 102 and an outer ring 103 are press-fitted into the recorder drum device in a conventional recording and / or reproducing device (hereinafter simply referred to as recording / reproducing device). As shown in FIG. 3, the upper bearing 2 attached to the shaft 201, such as the one provided,
A structure in which a spring 204 is arranged between 02 and the lower bearing 203 has been proposed.

By the way, in the former recorder drum device shown in FIG. 2, one of the bearings 104 and 105 is pressurized so that the distance between the bearing 104 and the bearing 105 is narrowed. Friction becomes great during rotation, wear of the bearing becomes high, vibration is generated in the shaft and bearing, and rotation of the drum 1 that rotates precisely becomes defective. Furthermore, assembly is also difficult.

Further, in the latter recorder drum device shown in FIG. 3, the spring 204 arranged between the upper bearing 202 and the lower bearing 203 is adapted to maintain a constant pressure between the bearings. Although there is no such problem, since a load such as the shaft 201 is additionally applied to the lower bearing 203 in addition to the load corresponding to the elastic force of the spring 204, a large concentrated load is applied to the lower bearing 203, Due to this concentrated load, the fatigue of the lower bearing 203 is high, the life of the lower bearing 203 is shortened, and the drum 1
It turned out that there is a problem in which the vibration of can not be eliminated in principle.

[Disclosure of Invention]

An object of the present invention is to make the rotation of the head drum in the recording / reproducing apparatus stable and smooth, and to effectively prevent the vibration of the head drum.

The object of the present invention is to provide a drum, a drum shaft that is inserted through a center hole of the drum, an upper bearing and a lower bearing that are arranged between the drum and the drum shaft, and an upper bearing and a lower bearing. The upper bush ring body and the lower bush ring body, the elastic material provided between the upper and lower bush ring bodies, and the lower bush ring body and the lower bearing, And a pressurizing boss connected to the recorder drum device.

That is, when the bearings are arranged above and below the drum, and the pressurizing boss, the upper and lower bush ring bodies, and an elastic material such as a spring are internally arranged between the upper and lower bearings. The problem of the recorder drum device of FIG. 3 has been solved.

〔Example〕

FIG. 1 is a sectional view of one embodiment of a recorder drum device according to the present invention.

In the figure, 1 is a lower drum (an upper drum is not shown) which is a fixed side of a rotary head drum of a recording / reproducing apparatus.

Reference numerals 2 and 3 denote a roller and a stator of a rotary transformer for supplying a current to a rotary head (not shown) and extracting a signal from the rotating magnetic head. The rotor 2 and the stator 3 are disc-shaped. Of the ferrite cores are opposed to each other with a gap l ₉ (for example, 50 to 70 μm). The rotor 2 is attached to the rotating magnetic head side (upper drum side), and the stator 3 is attached to the fixed lower drum 1 side.

Reference numeral 4 denotes a pressurizing boss having a protrusion formed on the inner lower part thereof. The pressurizing boss 4 is fastened and fixed to the lower drum 1 with a screw 5 at a lower portion of a center hole of the lower drum 1.

An angular lower bearing 6, for example, is press-fitted into the center hole of the lower drum 1 below the pressurizing boss 4.

A lower bush ring body 8 is provided in the center hole of the lower drum 1 above the pressurizing boss 4, a spring 10 is provided on the lower bush ring body 8, and an upper bush ring body 9 is provided on the spring 10. It is arranged.

Reference numeral 7 denotes, for example, an angular type upper bearing. The upper bearing 7 is press-fitted from above the upper bush ring body 9 into the center hole of the lower drum 1. The inner ring of the upper bearing 7 has a spring 10 The force acts via the upper bush ring body 9.

A drum shaft 11 penetrating the upper bearing 7 and the lower bearing 6 is inserted and arranged.

In addition, 12 is a bush, and this bush 12 is the lower drum 1.
It is fixed to the drum shaft 11 so as to be disposed at an upper position of the drum shaft 11, and is configured to maintain the squareness of the drum shaft 11 when the drum shaft 11 is press-fitted.

In the recorder drum device according to the present invention configured as described above, the upper bearing 7 is pressurized by the spring 10 of the bush ring bodies 8 and 9 above the pressure boss 4, and the lower bearing 6 is pressurized. Is configured so that only the load of the drum shaft 11 acts and the pressure applied by the spring 10 is applied only to the pressure boss 4 fixed to the lower drum 1 and does not act on the lower bearing 6. Therefore, the concentrated load as described with reference to FIG. 3 does not act on the lower bearing 6, wear of the lower bearing 6 does not easily occur, the life of the lower bearing 6 becomes longer, and the operation of the bearing is smooth.

Further, since the bush ring bodies 8 and 9 and the spring 10 are arranged, they constitute a damper mechanism, and the shock and vibration transmitted to the lower drum 1 and the drum shaft 11 are alleviated.

Further, as compared with the type shown in FIG. 2, since the upper bearing 7 is pressurized by the spring 10, the axial position of the drum can be easily determined.

Further, since the insertion diameter of the drum shaft 11 is about the insertion diameter of the spring 10 and the bush ring bodies 8 and 9, it is possible to reduce the distance between them, and even at this extent, the squareness of the drum shaft 11 is sufficient. Can be obtained.

〔effect〕

A recorder drum device according to the present invention includes a drum, a drum shaft inserted through a center hole of the drum, an upper bearing and a lower bearing arranged between the drum and the drum shaft, and a space between the upper and lower bearings. An upper bush ring body and a lower bush ring body, an elastic material disposed between these upper and lower bush ring bodies, and a lower bush ring body and a lower bearing, Since it is provided with a pressurizing boss connected to the drum, pressurizing is applied to the upper bearing by the upper and lower bush ring members above the pressurizing boss and the elastic material, and to the lower bearing. Since the pressurizing force is applied to the pressurizing boss that is not the bearing, the concentrated load is not applied to the lower bearing, and therefore the lower bearing is not worn. Is less likely to occur, its life is long, its operation is smooth, and the shock and vibration transmitted to the drum and drum shaft are alleviated by the damper mechanism consisting of the bush ring body and elastic material. Also, it has features such as easy determination of the axial position of the drum.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a recorder drum device according to the present invention, and FIGS. 2 and 3 are sectional views of a conventional recorder drum device. DESCRIPTION OF SYMBOLS 1 ... Lower drum, 2 ... Rotor, 3 ... Stator, 4 ... Pressurizing boss, 5 ... Screw, 6 ... Lower bearing, 7 ... Upper bearing, 8 ... Lower bush ring body, 9 ... Upper bush ring body, 10 ... Spring , 11 ... drum shaft, 12 ... bush.

Claims (1)

[Claims] 1. A drum, a drum shaft inserted through a center hole of the drum, an upper bearing and a lower bearing arranged between the drum and the drum shaft, and arranged between the upper and lower bearings. And an upper bush ring body and a lower bush ring body, an elastic material disposed between the upper and lower bush ring bodies, and a lower bush ring body and a lower bearing, which are coupled to the drum. A recorder drum device, comprising: