JPH02247857A - Drum device for magnetic tape recording and reproducing device - Google Patents

Abstract

PURPOSE:To abridge a working process by sticking a head chip on one ring plate and enabling it as a unit to be fitted to an upper drum by fitting through one touch. CONSTITUTION:The head chip 2 is positioned and stuck with an adhesive 3 in order to obtain a prescribed head projecting amt., head posture, head index amt. and head height based on a fitting surface 22 on the ring plate 20. Then, the ring plate 20 is fitted with the upper drum 1 in such a way that a fitting surface 33 of the upper drum 1 is fitted with the fitting surface 22 of the ring plate 20. In this case, a positioning pin 36 is inserted into a positioning hole 24 of the ring plate 20 and a positioning hole 32 for the upper drum to set their relative position. The head chip 2 is set up as to be positioned at a notched groove 34 for head protrusion. Then, the ring plate 20 and the upper drum 1 are fixed up with a screw 35 by using a loose hole 23 provided on the ring plate 20 and a screw hole 31 provided on the upper drum 1. Thus, the upper drum unit is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drum device for a rotary head type magnetic tape recording/reproducing device.

[Prior Art] Fig. 4 is an enlarged view showing a magnetic head mounting part of a conventional drum device disclosed in, for example, Japanese Utility Model Application Publication No. 62-35406. upper drum,
(2) is the head chip that sends and receives signals, (3) is the adhesive that attaches the head chip (2) to the head base (4), and (5) is the helad base (4) that is attached to the upper drum (1). Attachment screw, (6) is the coil wound around the helad tip (2), (7) is the magnetic tape that records or reproduces the signal from the head chip (2), (8) is the upper drum (1)
The rotating direction of the magnetic tape (7), (9) is the running direction of the magnetic tape (7), (
10) is the spatula gap portion, and (11) is the head protrusion direction 1. (12) indicates the direction of head rotation.

FIG. 5 is a diagram showing the external appearance of a drum device of a normal magnetic tape recording/reproducing device. In the figure, (13) is a fixed lower drum, and (14) is a lower edge of a running magnetic tape (not shown). (15) is a drive motor that rotates the upper drum (1), (16) is a mounting part for fixing this drum device to a chassis (not shown), (34) is a lead part that guides the upper drum (1) along the This is a cutout groove (window) for protruding the magnetic head.

The general internal structure of this drum device is shown in FIG. In this figure, (17) is a bearing that rotatably supports the upper drum (1), (19) is a shaft that is rotatably supported by the bearing (17), and (18) is a shaft (19).
It is an integrated flange.

The upper drum (1) is attached to this flange (19).

The head chip (2) is attached to the head base (4) with adhesive (3).
) can be pasted. After that, the coil (6) is wound, the head height, etc. are measured, and the head is classified into ranks.

When attaching the head chip (2) to the upper drum (1), this head base (4) is fixed with screws (5). At this time, the head chip (2) is finely adjusted in the projecting direction (11) and is projected by a certain set distance from the outer peripheral surface of the upper drum (1). Then, the attitude of the head chip (2) is adjusted by taking the head base (4) in the rotating direction (12) so that the gap part (10) at the tip of the head chip (2) is at the apex. Each of the above adjustments requires precision on the order of microns.

[Problems to be Solved by the Invention] Since the magnetic head mounting portion in the drum unit of the conventional magnetic tape recording/reproducing device is configured as described above, when the magnetic head is mounted on the upper drum, the amount of protrusion and the head Problems include the mounting posture, and if there are multiple heads, the mutual head mounting angle (indexing position) must be finely adjusted, making the process complicated and requiring a dedicated jig for each adjustment. was there.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a drum device for a magnetic tape recording/reproducing apparatus in which a magnetic head can be attached to an upper drum with a single touch.

[Means for Solving the Problems] A drum device according to the present invention is such that a head chip is pasted on two ring plates, and the ring plates are attached to an upper drum by fitting.

[Operation] In the drum device according to the present invention, the ring plate to which the bed chip is attached is attached to the upper drum by fitting.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In Figure 1, (20) is a ring plate, (2
1) is a relay board, (22) is a fitting surface made with high precision, (23) is a hole, and (24) is a positioning hole.

An example of attachment to the upper drum is shown in FIG. In Figure 2, (1) is the upper drum, (31) is the screw hole, (3
2) is a positioning hole, (33) is a precisely made fitting surface, (34) is a notched groove for head protrusion provided on the upper drum (1), and (35) is a ring plate (20). The screw for fixing to the upper drum (1), (36) is the ring plate (2
This is a positioning pin that aligns the positioning holes (24) and (32) for defining the relative position of the upper drum (1) and the upper drum (1).

Now, to explain in detail with reference to Figure 1, the ring plate (
20) Position the head chip (2) so that the predetermined head protrusion amount, head posture, head indexing opening, and head height are obtained based on the upper fitting surface (22), and apply the adhesive (3). Paste it.

In the figure, the ring plate (20) has two heads, but more heads are possible as well. Next, as shown in Figure 2, the ring plate (20) is attached to the upper drum (1) so that the fitting surface (33) of the upper drum (1) and the fitting surface (22) of the ring plate (20) are aligned. Insert into. At this time,
A positioning pin (36) is inserted into the positioning hole (24) of the ring plate (20) and the positioning hole (32) for the upper drum to align the relative positions. The head chip (2) is set so as to be located in the head protruding notch groove (34).

Next, screw holes (23) made in the ring plate (20) with screws (35) and screw holes (31) made in the upper drum (1).
) to fix it. The upper drum unit is thus completed.

In the above embodiment, the inner circumferential surface of the ring plate (20) was used as the fitting surface, but as shown in FIG. 3, the ring plate (20)
The outer peripheral surface of the upper drum (1) may be used as the fitting surface (30), and the inner peripheral surface of the outer ring of the upper drum (1) may be used as the fitting surface (40).

Although the above embodiment has been explained using two heads, the effect of the present invention increases as the number of heads increases.

In the above embodiment, the entire inner circumferential surface of the ring plate is used as a fitting surface, but only a part of the inner circumferential surface may be used, and the same effect as in the above embodiment can be obtained.

Furthermore, although a ring plate is used in the above embodiment, it may be rectangular, and any shape that allows positioning with the so-called upper drum will produce the same effects as in the above embodiment.

[Effects of the Invention] As described above, according to the present invention, the head chip is pasted on one ring plate, and the head chip can be attached as a unit to the upper drum with one touch by fitting. This has the effect of shortening processes, such as reducing time.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a ring plate for attaching a magnetic head to a drum device according to an embodiment of the present invention, and FIG. 2 is an exploded view showing a method of attaching the ring plate having the magnetic head of FIG. 1 to an upper drum. 3 is a developed view showing a ring plate for mounting a magnetic head in another embodiment of the present invention, FIG. 4 is a front view showing a conventional magnetic head mounting, and FIG. 5 is a conventional drum device. FIG. 6 is a perspective view showing the entire structure, and FIG. 6 is a sectional view of the drum device shown in FIG. 5. In the figure, (2) is the head chip, (3) is the adhesive,
(20) is a ring plate, (21) is a relay board, (22) is a fitting surface, (23) is a hole, and (24) is a positioning hole. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) Equipped with a magnetic head, consisting of a rotating upper drum and a fixed lower drum, a tape-shaped magnetic recording medium is wound around a part of the outer circumferential surface of the drum, and signal tracks are formed diagonally on the magnetic recording medium. This is a drum device configured to form a head chip on a single ring plate, and the head chip is assembled into a unit by fitting the inner circumferential surface or outer circumferential surface of the ring plate with the upper drum in one-touch operation. A drum device for a magnetic tape recording and reproducing device, characterized in that the drum device is attached to the upper drum.