JPH1064028A - Method for assembling head drum device for digital video cassette recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved assembling method for a head drum device for a digital video cassette recorder by connecting a coil of a rotary transformer to a drum head by soldering without using a connector. SOLUTION: This head drum device assembling method is constituted so as to contain a process forcedly feeding a bearing assembly 110 rotatably attached onto a fixed shaft 113 into an upper part drum 150 having plural heads, the process attaching the rotary transformer 120 to the bottom surface of the flange part 111 of the bearing assembly 110, the process electrically connecting the coil 132 in the rotary transformer 120 to respective heads of the drum by soldering and the process fixing a lower part drum 140 attaching a fixed transformer 130 to its inner bottom surface onto the fixed shaft 113 in the feeding state so that a prescribed gap exists between the rotary transformer 120 and the fixed transformer 130.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head drum device used in a digital video cassette recorder (hereinafter, referred to as "DVCR"). More specifically, the present invention relates to a winding drum of a rotary transformer and a head of an upper drum. The present invention relates to an improved method of assembling a head drum device for a DVCR that can be connected by soldering without using a connector.

[0002]

2. Description of the Related Art FIGS. 1 to 3 show a conventional assembling method of a head drum device for a DVCR.

Referring to FIG. 1, a bearing assembly 10 rotatably mounted on a fixed shaft 13 is located on a jig J1, and a rotary transformer 20 to which a connector 21 is fixed is provided with a suitable adhesive. Bearing assembly 10 using
Is attached to the bottom surface 12 of the flange portion 11.

Referring to FIG. 2, a lower drum 40 in which a fixed transformer 30 is disposed is located on another jig J2.
The fixed shaft 13 is pressed into the central hole of the lower drum 40 so that a predetermined gap exists between the fixed shaft 13 and the fixed shaft 13.

Referring to FIG. 3, after that, the upper drum 50 having a plurality of heads 51 is moved from above to the upper drum 50.
A plurality of screws S fastened into the flange portion 11 of the bearing assembly 10 through the
1 is pressed onto the bearing assembly 10 so as to be electrically connected to the bearing assembly 10. Next, the motor rotor 61 is
The motor stator 62 is fixed on the inner bottom surface of the fixed shaft 13.

However, in such a conventional head drum device assembling method, the fixed shaft 13 of the bearing assembly 10 is not provided.
Is press-fitted into the lower drum 40, and the upper drum 50 is fixed on the bearing assembly 10 by a plurality of screws S fastened from above through the upper drum 50 into the flange portion 11 of the bearing assembly 10. It is difficult to electrically connect the winding coils in each of the heads to each head 51 by soldering, which requires the use of a connector for these connections, thereby increasing the manufacturing cost. there were.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a DVCR head capable of connecting a winding coil of a rotary transformer and a head of the drum by soldering without using a connector. It is to provide an improved method of assembling a drum device.

[0008]

According to the present invention, there is provided a method of assembling a head drum device used in a digital video cassette recorder, comprising the steps of:
Press-fitting a bearing assembly rotatably mounted on a fixed shaft into an upper drum having a plurality of heads, mounting a rotary transformer on a bottom surface of a flange portion of the bearing assembly, and winding in the rotary transformer The process of electrically connecting the coil to each head of the drum by soldering, and the lower drum having a fixed transformer attached to its inner bottom surface, wherein a predetermined gap exists between the rotary transformer and the fixed transformer. And a step of press-fitting the digital video cassette recorder onto the fixed shaft.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of assembling a head drum device for a DVCR according to a preferred embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 4, first, a plurality of heads 1 are provided.
An upper drum 150 having 51 is located on the jig J3, and a bearing assembly 110 rotatably mounted on a fixed shaft 113 is pressed into a central hole of the upper drum 150 to be on a flange portion 111 of the bearing assembly 110. Are fixed by a plurality of screws S fastened in the screw holes of the upper drum 150 via the plurality of screw holes formed in the upper drum 150.

Referring to FIG. 5, the rotating transformer 120 is then mounted on the bearing assembly 110 using, for example, an adhesive.
The winding coil 122 attached to the bottom surface of the flange portion 111 and wound in the annular groove of the rotary transformer 120 is electrically connected to each head 151 of the upper drum 150 by soldering.

Referring to FIG. 6, a lower drum 140 having a fixed transformer 130 mounted on the inner bottom surface thereof is next described.
Are fixed on the fixed shaft 113 in a press-fit state so that a predetermined gap exists between the rotary transformer 120 and the fixed transformer 130.

Referring to FIG. 7, finally, the motor rotor 161 is fixed on the inner bottom surface of the upper drum 150, and the motor stator 162 is connected on the fixed shaft 113. The winding coil 132 in the fixed transformer 130 is further electrically connected to a flexible printed circuit board by soldering.

[0014]

According to the assembling method of the present invention, after the bearing assembly is press-fitted into the upper drum and the rotary transformer is mounted on the flange of the bearing assembly, the lower drum is connected to the fixed shaft. Rotary transformer 1
Since the twenty winding coils 122 can be electrically connected to each head 151 by soldering without using a connector, the manufacturing cost of the DVCR is reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional assembling method of a head drum device for a DVCR.

FIG. 2 is a sectional view showing a conventional method of assembling a head drum device for a DVCR.

FIG. 3 is a sectional view showing a conventional method of assembling a head drum device for a DVCR.

FIG. 4 is a sectional view showing a method of assembling a head drum device for a DVCR according to the present invention.

FIG. 5 is a sectional view showing a method of assembling the head drum device for DVCR according to the present invention.

FIG. 6 is a cross-sectional view showing a method of assembling the head drum device for DVCR according to the present invention.

FIG. 7 is a sectional view showing a method of assembling the head drum device for DVCR according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Bearing assembly 11 Flange part 12 Flange part bottom face 13 Fixed shaft 20 Rotary transformer 21 Connector 30 Fixed transformer 40 Lower drum 50 Upper drum 51 Head 61 Motor rotor 62 Motor stator 110 Bearing assembly 111 Flange part 113 Fixed shaft 120 Rotary transformer 122 Winding coil 140 Lower drum 150 Upper drum 151 Head 161 Motor rotor 162 Motor stator S Screw J1 Jig J2 Jig

Claims (2)

[Claims] 1. A method of assembling a head drum device used in a digital video cassette recorder, comprising: pressing a bearing assembly rotatably mounted on a fixed shaft into an upper drum having a plurality of heads; Attaching a transformer to the bottom surface of the flange portion of the bearing assembly; electrically connecting a winding coil in the rotary transformer to each head of the drum by soldering; and a fixed transformer attached to the inner bottom surface. Fixing the lower drum in a press-fitted state on the fixed shaft such that a predetermined gap exists between the rotary transformer and the fixed transformer. How to assemble the device. 2. The digital video cassette recorder according to claim 1, wherein the bearing assembly is fixed to the upper drum by a plurality of screws fastened through the flange portion and into the bottom of the upper drum. For assembling a head drum device for a vehicle.