JPS6113419A - Rough adjusting device for fitting of video head - Google Patents

Abstract

PURPOSE:To display accurately the height position of a head rack on a monitoring scope by fitting a stopper threadbly to an end surface of a jig shaft to inhibit a rotary drum from moving with the energizing force of a spring, and holding the stopper so that the stepped surface of a tandem hole as a reference surface coincides with the end surface of the jig shaft. CONSTITUTION:The rotary drum 15 is fitted to the jig shaft 27 through the tandem hole 20 with a head base 17 up and the stopper is clamped abutting on the end surface 28 of the jig shaft 27. Then, the rotary drum 15 is pressed against the stopper 31 with the energizing force of the spring 30 and the stepped surface 21 of the tandem hole 20 as the reference surface 18 coincides with the end surface 28 of the jig shaft 27 as a fitting reference surface 24. A telecamera 33 is positioned over the fitting reference surface 24 at head track height required for design and also set in a radial direction. Consequently, a video head 16 and annular interference fringes are displayed on the monitoring scope 25, thereby judging whether the video head is fitted in the centered state or not.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a video head mounting coarse adjuster for a rotating drum used in a video tape recorder.

[Conventional technology]

Conventionally, various types of video head attachment coarse adjusters have been implemented. For example, Figures 4 to 6
The one shown in the figure is known. The video head attachment rough adjuster is designed to roughly adjust the track height of the video head 3 attached to the rotary drum base 2 of the rotating drum 1 during the head temporary attachment stage. That is, a short cylindrical boss 5 is formed on the base 4, and a screw hole 6 is formed in the center of the end surface of the boss 5. The height of the boss 5 is equal to the stepped surface 7A of the different diameter hole 7, which is a reference surface, and is bored in the rotating drum 1.
The height is slightly lower than the height from the base 4 to the contact surface of the base 4. A hole 7 of different diameter is fitted into the boss 5, and then a holding jig 8 is screwed into the screw hole 6 and tightened, thereby fixing the rotating drum 1. As shown in FIGS. 5 and 6, the television camera 9 and monitor screen 10 are used to adjust the posture and protrusion of the video head 3 when it is attached.

[Problem to be solved]

However, in such a conventional video head mounting coarse adjuster, although the head base 2 on which the video head 3 is mounted uses the stepped surface 7A of the hole 7 of different diameters as a reference surface, the head Since the end surface 13 on the opposite side of the base 2 is brought into contact with the base 4 and used as a reference, the error thereof is larger than that of the stepped surface 7A of the different diameter hole 7, which is the reference surface, for example, ±
It is said to be 0.05. Therefore, with a scale based on the fixed electronic line 12 of the monitor screen 10, the track height of the video head 3 cannot be accurately grasped, and rough adjustment of the height is impossible.

[Means for solving problems]

The means of the present invention for solving the above problems includes a jig shaft that is installed perpendicularly to a base and whose end face serves as a reference surface for mounting, and a rotating drum that is attached to the jig shaft through holes of different diameters. A spring that biases the drum to move toward the end face along A stopper is provided to hold the stepped surface of the jig in alignment with the end surface of the jig shaft.

〔Example〕

Below 1. An embodiment of the invention will be described in detail with reference to FIGS. 1 to 3.

The drawings show an embodiment in which the present invention is applied to a video head attachment coarse adjuster. In the drawings, reference numeral 15 denotes a rotating drum which, together with the lower drum, rotates the video head 16 at high speed to enable vast information processing capacity. The video head 16 is attached to the helad base 17 of the rotating drum 15, and the track position of the video head 16 is at the reference plane 1.
It is designed to have a predetermined height from 8 to 8, and is required to have a high degree of M. The video head 16 is assembled to the head base 17 with a retaining screw 19 under a constant stress state in order to eliminate displacement of the head track height position.

The head base 17 is machined with high precision using the stepped surface 21 of the different diameter hole 20 of the rotating drum 15 as a reference surface 18. This example has a machining accuracy of ±0.002. Rough adjustment in the head temporary attachment stage is performed by the spacer 22 interposed between the video head 16 and the head base 17, but at this time, the adjustment is within the adjustable range by the push screw 19 in the next step, the main adjustment of the video head. It would be very convenient to be able to check whether the

The video head attachment coarse adjuster 23 makes this confirmation easy. This video head installation coarse adjuster 23
The height of the track position of the video head 16 is accurately displayed on the monitor screen 25 by aligning the stepped surface 21 of the different diameter hole 20, which is the reference surface 18, with the mounting reference surface 24, and whether or not it is within the allowable setting sewing range. This makes it easy to check whether the

That is, a cylindrical jig shaft 27 is vertically attached to the base 26, and an end surface 28 of the jig shaft 27 is perpendicular to the axial direction and forms an attachment reference surface 24 when attaching and fixing the one-rotation drum 15. A coiled spring that urges the rotating drum 15 to move toward the end surface 28 when the rotating drum 15 is attached to the jig shaft 27 with the head base 17 side facing upward through the different diameter hole 20. 30 is wound around the jig shaft 27. Reference numeral 31 denotes a stopper, which is screwed onto the end surface 28 of the jig shaft 27 through a screw hole 32 formed at its center, and prevents the upper rotating drum 15 from moving due to the biasing force of the spring 30, and serves as the reference surface 18. The upper rotary drum 15 can be held horizontally with the stepped surface 21 of the different diameter hole 20 aligned with the end surface 28 of the jig shaft 27, which is the mounting reference surface 24.

Next (two effects (explain with two).

In order to coarsely adjust the head track height position in the head temporary attachment stage using the video head installation rough adjuster 23 having the above configuration, as shown in FIGS. 2 and 3, the jig shaft 27 is The rotary drum 15 is attached through the different diameter hole 20 with the head base 17 side facing upward, and then the stopper 31 is brought into contact with the end surface 28 of the jig shaft 27 and tightened.

Then, the rotating drum 15 is pressed against the stopper 31 by the urging force of the spring 30, and the stepped surface 21 of the different diameter hole 2o, which is the reference surface 18, is pressed against the jig shaft 2, which is the mounting reference surface 24.
It corresponds to the end face 28 of 7. The television camera 33 is positioned at a head-track height required for design from the mounting reference plane 24, and is set so as to be oriented in the radial direction.

As a result, the video head 16 and ring-shaped interference fringes are imaged on the monitor screen 25, as shown in FIG.

From the ring shape of the interference fringes, it can be determined whether the video head 16 is mounted in a centered state in the radial direction.

Further, on the monitor screen 25, the head track height of the video head 16 at the temporary attaching stage can be measured using a scale that uses the set head track height position as the reference line 34.

As shown in FIG. 3, a reference line 34 is displayed on the monitor screen 25.
If a tolerance setting line 35 is provided, and the tolerance range Δ is within both lines 34.35, it is possible to determine whether the head track height position of the video head 16 is within the tolerance range Δ by simply checking the monitor screen 25. can be easily confirmed.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various applications and modifications are possible.

〔effect〕

As is clear from the above description, according to the present invention, there is provided a jig shaft that is provided perpendicularly to a base and whose end face is the mounting reference surface, and a rotating drum that is attached to the jig shaft through holes of different diameters. A spring is attached to the end surface of the jig shaft to prevent the rotating drum from moving due to the biasing force of the spring, and the spring biases the drum to move toward the end surface along the jig shaft. Since it is equipped with a stopper that holds the stepped surface of the barrel different diameter hole in line with the end surface of the jig shaft, the rack position of the video head during the head temporary attachment stage can be accurately displayed on the monitor screen. can do. By displaying the adjustable range with the push screw and the corresponding tolerance range on the monitor screen using the tolerance setting line, you can easily confirm that the track height position is within the adjustable range with the push screw, and reduce the man-hours required for this adjustment. can be significantly reduced.

[Brief explanation of drawings]

FIG. 1(A) is a sectional view showing a video head mounting@adjuster according to one embodiment of the present invention, and FIG.
＞ is an enlarged sectional view showing the push screw, FIG. 2 is an action explanatory diagram showing the rough adjustment method, FIG. 3 is a front view showing the monitor screen,
FIG. 4 is a cross-sectional view showing a conventional video head mounting 1111W adjustment device, FIG. 5 is an operational explanatory view showing a coarse adjustment method, and FIG. 6 is a front view showing a monitor screen. 15...Rotating drum, 18...Reference surface, 20...Saved diameter hole, 24...Mounting reference surface, 26...Base, 27 ....-Jig shirt 1-1 28... End face, 30... Spring, 31... Stopper. Applicant NEC Home Electronics Co., Ltd. Agent Patent Attorney Masu 1) Takeo No. I Figure (A) Figure 2 Figure 1 (B) Figure 3

Claims (1)

[Claims] 1. A jig shaft that is provided perpendicularly to the base and whose end face is the mounting reference surface, and a rotating drum that is installed along the jig shaft when it is attached to the jig shaft through holes of different diameters. A spring that biases the drum to move toward the end surface side is screwed onto the end surface of the jig shaft to prevent the rotating drum from moving due to the biasing force of the spring and to fix the stepped surface of the different diameter hole that serves as the reference surface. A rotating drum coarse adjuster comprising: a stopper that is held in alignment with the end surface of a tool shaft;