KR19980013985U - Bushing for V-Head Head Base - Google Patents

Abstract

The present invention relates to a bushing for fastening the head base of V-Cal. More specifically, the head base which rotates with the upper drum which rotates at high speed and supports the video head for recording a video signal or reading a signal from the tape is recorded. A bush provided in a fastening bolt fixed on an upper drum. The bush main body 10 and the bushing for fastening a head base 5 fastened to a bottom surface of an upper drum 3 by a screw 5a. It is arranged to be inclined to one side on the inner circumference of the bush body 10, characterized in that the head base fastening bush of V-Cal having a plurality of pressing projections 12 each retaining elasticity.

Description

Bushing for V-Head Head Base

The present invention relates to a bushing for fastening the head base of V-Cal. More specifically, the head base which rotates with the upper drum which rotates at high speed and supports the video head for recording a video signal or reading a signal from the tape is recorded. It relates to a bush provided in the fastening bolt for fixing on the upper drum.

In general, V-Cal records signals on a main base, a traveling system installed on the main base to take out a tape from a cassette and moves along a predetermined path, and records a signal on a moving tape disposed at an appropriate place of the traveling system. It is equipped with a head drum assembly for reproducing a signal from.

Looking at the configuration of a conventional head drum assembly with reference to Figure 1 for clarity, the head drum assembly is a lower drum (1) which is fixed to the main base not shown in the drawings, and through the lower drum (1) A main shaft (2) to be assembled, an upper drum (3) fixed to an upper end of the main shaft (2) and rotating with respect to the lower drum (1) together with the main shaft (2), and the main shaft (2) and an upper drum ( It consists of an electric motor (4) for generating a rotational power supplied to 3). Then, a head base 5 is attached to the bottom of the upper drum 3 so that the height can be adjusted by a screw 5a or the like, and each head base 5 magnetically records an image signal at a radially outer end thereof. Or a video head 6 for playback. In addition, since the rotary transformer 7 is installed between the upper drum 3 and the lower drum 1 so as to transmit a signal in a non-contact manner, an image signal supplied to or output from the video head is generated. You can give and receive without. On the other hand, the electric motor 4 is composed of a stator 4a attached to the lower drum 1 and a rotor 4b fixed to the main shaft 2 and rotating in rotation with respect to the stator 4a. 4b rotates at high speed with the main shaft 2 and the upper drum 3 as the current is supplied to the stator 4a, thereby causing the video head 6 to scan the signal tracks of the tape in turn.

The head drum assembly is provided with a head base 5 for supporting a video head 6 for scanning an image signal from a tape on the upper drum 3 as described above. 3) has been developed a head drum assembly having a conventional two head to four head or six heads for the optimization of image quality. Therefore, each video head 3 requires a head base 5, the head base 5 is fixed to the upper drum 3 by screws 5a as described above, and the set screw 5b. The height adjustment is possible by the installation. The screw (5a) is fastened via the bush (5c).

The conventional head rum assembly as described above has a problem that the tightening state of the head base is relaxed or the head terminal changes due to external impact or the like, which causes a significant adverse effect on image quality.

That is, in the related art, when the head base 5 is fastened with the screw 5a, the fastening is performed by using the flat bush 5c, so that the screw 5a may be damaged due to an external shock during handling or an impact applied during transportation. The tightening state of the becomes poor, the position of the head base 5 is changed. Therefore, since the position of the video head fixed to the head base 5 and scanning the video signal from the actual tape is changed, the image quality is deteriorated.

In particular, the problem as described above may be caused by the micro-vibration generated in the head drum assembly when used in the real home, etc., it is required to improve the tightening state of the screw.

Accordingly, the present invention has been made to solve the above problems, the purpose is to improve the fixed state of the head base head of the V-Cal so that the position of the head base is not changed by external vibration and impact, etc. It is to provide a bush for the base fastening.

Figure 1 is a longitudinal cross-sectional view showing the configuration of a typical head drum assembly

Figure 2 is an enlarged cross-sectional view showing the main head fastening structure of the related art

Figure 3 is a perspective view showing the configuration of the head base fastening bush according to the present invention

Figure 4 is a plan view showing the configuration of the head base fastening bush according to the present invention

Explanation of symbols on the main parts of the drawings

1: lower drum 2: spindle

3: upper drum 5: head base

5a: screw 6: video head

10: bush body 12: pressure projection

An object of the present invention is to configure a bushing for fixing the head base to be screwed to the bottom of the upper drum, the bush body and the inner periphery of the bush body is arranged to be inclined to one side, each with a plurality of pressing projections each retaining elasticity It can be achieved by the bushing for the head base fastening of the V-Cal made.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the head base fastening bush of V-Cal according to the present invention will be described in detail as follows. Explain.)

3 is a perspective view showing only the head base fastening bush according to the present invention. According to the present invention, a plurality of pressing protrusions 12 are formed on the inner circumferential surface of the circular bush body 10.

Each of the pressing protrusions 12 has a uniformly arranged arrangement to one side, each of the pressing protrusions 12 is to have a predetermined elasticity.

In addition, as shown in FIG. 4, the diameter of the front end of each of the pressing protrusions 12 is larger than the outer diameter of the screw 5a for fastening the head base 5, and at the same time, the diameter of the valley is formed by the screw ( It should be larger than the outer diameter of 5a).

According to the present invention, each of the pressing protrusions 12 is elastically expanded by the insertion of the screw 5a and allows the entry of the screw and presses the peripheral edge of the entry-completed screw to restrain the screw 5a from rotating by magnetic force. Done.

Head base according to the present invention having such a configuration is that when the fastening bush to fasten the head base 5 on the upper drum (3) via the bushing body 10, each of the pressing projections 12 are elastic It will expand and allow the entry of the screw. At this time, each of the pressing protrusions 12 are elastically deformed to be inclined more toward the photographic direction as shown in FIG. Will press the leading edge.

Therefore, when the entry is completed, each of the pressing projections 12 are in contact with the periphery of the screw and each presses inward in the radial direction, so that the rotation of the screw 5a is limited by its own force, as well as being released by vibrations and shocks applied from the outside. Will not. That is, the screw (5a) when the respective pressing projections 12 are elastically deformed in the inclined direction when fastening, so that when the separation is to be rotated in the opposite direction of the inclined direction, each pressing projection 12 Since it has elastic restoring force to rotate together in the opposite direction of the inclined direction, when the screw 5a is rotated in the unwinding direction, the elastic restoring force is tightened and the peripheral edge of the screw is more strongly tightened, thereby preventing loosening of the screw.

As described above, the head-base fastening bush of V-Cal according to the present invention forms several pressing protrusions which are inclined in one direction on the inner circumference of the bushing body so that the pressing protrusions elastically deform and allow the screw to enter, It is possible to prevent screw loosening by limiting rotation of screw in reverse direction, that is, loosening direction after completion of entry, and to prevent the change of the position of head base by vibration or shock applied from the outside. It has an effect.

Claims (2)

In constructing a bush for fixing the head base 5 fastened to the bottom surface of the upper drum 3, Bushing for fastening the head base of the V-Cal having a bush body 10 and a plurality of pressing protrusions 12 each arranged to be inclined to one side at an inner circumference of the bush body 10 and retaining elasticity. According to claim 1, wherein the diameter of the circle formed by the tip of each of the pressing projections 12 is smaller than the outer diameter of the screw, the diameter of the circle formed by the valleys of each of the pressing projections 12 is configured to be smaller than the outer diameter of the screw Bushing for fastening the head base of the V-Cal.