JPH0414605A - Drum unit - Google Patents

Abstract

PURPOSE:To simplify a process and to reduce on assembly time by mounting a magnetic head chip and a rotary transformer of a rotor onto a board with a step fitted integrally with a rotary shaft and mounting a rotary drum on the board. CONSTITUTION:A stepped flange 23 is fitted to a shaft with a bearing 27 fitted integrally with a lower drum 13 turnably. Then plural magnetic head chips 2 and an upper drum 1 are fitted to a magnetic head chip mount face 24b, an upper drum fit part 28b and an upper drum mount face 29b respectively finished on shaft basis of the bearing 27 of the flange plate 23. Then a screw 30 provided to the upper drum 1 adjusts a height of the head of the plural magnetic head chips 2. Since the plural magnetic head chips 2 are adhered integrally to the flange plate 23, the upper drum 1 is fitted in on-touch.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a drum unit of a rotary head type magnetic recording/reproducing device, and in particular to mounting of a magnetic head rad mount and a rotating side rotary transformer.

[Prior Art] FIG. 9 is a partial cross-sectional view of the magnetic head mounting portion of a conventional drum unit disclosed in, for example, Japanese Utility Model Application Publication No. 62-35406. Hereafter, it will be referred to as the upper drum.

(2) is a magnetic head chip that sends and receives signals, (3) is an adhesive that attaches the magnetic head chip (2) to the head base (4), and (5) is a magnetic head chip that attaches the head base (4) to the upper tram (1).
), (6) is the magnetic head chip (2)
(7) is the magnetic tape that records or reproduces signals from the magnetic head chip (2), (8) is the direction of rotation of the upper drum (1), (9) is the running direction of the magnetic tape (7) direction, (10) is the magnetic head gap, (11)
(12) indicates the direction of protrusion of the magnetic head, and (12) indicates the direction of rotation of the magnetic head.

Next, see Utility Model Application No. 64-801 or Utility Model Application No. 64-801.
The conventional drum structure shown in Japanese Patent No. 24508 will be explained. Fig. 10 is a diagram showing the appearance of a normal drum unit. In the figure, (13) is a fixed cylinder which is a fixed part, and (14) is a fixed cylinder which is a fixed part, and (14) is a cylinder along which the end surface of a magnetic tape (not shown) is placed. (15) is a drive motor that rotates the upper tram (1); (16) is a mounting portion that fixes the chassis (not shown) and the drum unit.

Furthermore, FIG. 11 is a sectional view showing the general structure of the drum unit, and in the figure (I7) is the upper drum (1).
(18) is a flange that is integrated with the shaft (20) which is the mating member when attaching the upper drum (1), (19) is a flange that supports the rotation of the upper drum (1).
8), (21) is the rotating side rotary transformer, (22) is the notched groove for ejecting the magnetic head.
shows.

Next, the operation will be explained. Magnetic helad tip (2)
is pasted on the head base (4) with adhesive (3). Thereafter, after winding the coil (6), the head height etc. are measured and the heads are classified into ranks. When mounting the magnetic head tip (2) on the upper drum (1), it is fixed with a screw (5) via this head base (4). At this time,
The magnetic head chip (2) is arranged in an ejecting direction (11) so that it is ejected a certain distance from the outer peripheral surface of the upper drum (1).
The gap at the tip of the magnetic head (1
The head base (4) to which the magnetic head chip (2) is attached is swung in the -rotational direction (12) so that the magnetic head chip (2) is at the top, and the attitude of the magnetic head chip (2) is adjusted. Each of the above adjustments requires precision on the order of microns.

Furthermore, as shown in Fig. 11, since the magnetic herad tip (2) and the rotary side rotary transformer (21) are attached to separate members, the signal line (not shown) is usually connected to the upper drum (
1) is configured to be relayed on the top surface.

[Problem to be Solved by the Invention 1] In the conventional drum unit, the magnetic head mounting portion is configured as described above, so the magnetic head is attached to the upper drum (1).
), it is necessary to fine-tune the protrusion amount, mounting posture, and if there are multiple magnetic heads, the mutual magnetic head mounting angle (indexing amount), and also the magnetic head and rotating side rotary transformer (21). The signal wires had to be routed after the drum was assembled, which caused problems such as the process was complicated and special jigs were required for each adjustment.

This invention was made to solve the above-mentioned problems, and since the magnetic head is integrally attached to the stepped plate on the rotating shaft side, the upper drum can be attached with one touch, and the magnetic head and The purpose of the present invention is to obtain a drum unit whose process is simplified, such as by being able to easily route signal lines to and from a rotary transformer on the rotating side.

Means for Solving the Problem] The drum unit according to the present invention has a magnetic heald tip and a rotary transformer on the rotating side attached to a single stepped plate that is integrally attached to the rotating shaft, and an upper plate on the plate surface. It is designed to have a drum attached to it.

[Effect]

In the drum unit of the present invention, the magnetic helad tip, the rotary transformer on the rotating side, and the upper tram are attached to a stepped plate that is attached integrally to the rotating shaft.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Fig. 1 is a sectional view of the drum unit, Fig. 2 is a sectional view of the rotating side rotary transformer attached to the stepped flange plate, and Fig. 3 is a sectional view of the lower drum with the shaft bearing fitted.
Figure 4 is an assembled cross-sectional view of the parts shown in Figures 2 and 3 fitted together, Figure 5 is a cross-sectional view of the magnetic helad chip mounted, and Figure 6 is a cross-sectional diagram illustrating the installation of the upper drum. figure,
FIG. 7 is an enlarged view of the head gap plane for explaining the height difference adjustment of the magnetic head chip, and the same or corresponding parts as those of the conventional device are given the same reference numerals and the explanation thereof will be omitted. In the figure, (23) is the stepped flange plate, (24b) is the magnetic helad tip mounting surface of the stepped flange plate (23), and (25) is the stepped flange plate.
is an adhesive for pasting the magnetic head chip (2), (26
) is a hole (32) provided in the stepped flange plate (23) to connect the magnetic helad tip (2) and the rotating side rotary transformer (21).
) and connected with a relay wire (33), (27) is a stepped flange plate (2) equipped with a magnetic herad chip (2).
3) is rotatably supported, (28b) is the fitting part with the upper tram (1) provided on the stepped flange plate (23), (29, b) is the stepped flange plate (23) The mounting surface of the upper drum (1) provided on the upper drum (1), (30) is the mounting surface of the magnetic head chip (2
), (31) is the screw for fastening the lower drum (13) to the chassis mounting part (16), (34) is the fitting hole for the shaft bearing (27), (35
) is the screw hole for fixing the upper drum (1), (36) is the adhesive surface between the rotating side rotary transformer (21) and the stepped flange plate (23), (37) is the ball of the shaft bearing (27), ( 38
) is a sleeve that constitutes the outer peripheral surface of the shaft bearing (27), (
39) is the fitting part (40) between the sleeve (38) and the lower drum (13) is the fixed side low retrans attached to the lower drum (13), and (41) is the chassis mounting part (16).
Shows the screw holes for fastening. In the figure, surfaces A, B, and C are surfaces that are finished based on the shaft reference of the shaft bearing (27).
(24a), (28a), (29a) before processing, respectively.
The results after processing are shown as (24b), (28b), and (28b), respectively.
29b).

Next, the operation will be explained. Figure 1 shows an overall view of the drum after assembly is completed. In the figure, the stepped flange plate (23) is attached to the rotatable shaft of the bearing (27) that is fitted integrally with the lower drum (13). Fitted, shaft bearing (2
A plurality of magnetic helad tips (2) are installed on the magnetic helad tip mounting surface (24b), upper drum fitting part (28b), and upper drum mounting surface (29b), which are finished according to the axis reference of 7).
, an upper drum (1) is attached, and a plurality of magnetic head chips (2) are attached by screws (30) provided on the upper drum (1).
Adjust the head height (step).

The individual assembly steps will be explained with reference to FIGS. 2 to 7.

First, FIG. 2 shows the location where the rotating side rotary transformer (21) is attached to the stepped flange plate (23). In FIG. 2, the rotating side rotary transformer (21) is attached to the adhesive surface (36) with reference to the fitting hole (34) of the upper drum (1). The relay wire (33), which is a signal line from the rotating side rotary transformer (2I), is passed through the hole (32) of the stepped flange plate (23), and the relay board (26) is pasted on the stepped flange plate (23). ). FIG. 3 shows the lower drum (13) and the shaft bearing (27) fitted together. In the figure, the sleeve (38) provided on the outer peripheral surface of the shaft bearing (27) and the lower tram (13) are fitted. It is fixed by shrink fitting, press fitting, or gluing. The fixed side low retrans (40) is further adhesively fixed to the lower tram (13). FIG. 4 shows the part shown in FIG. 2 and the part shown in FIG. 3 fitted together. In the figure, the stepped flange plate (23) is fitted onto the shaft of the bearing (27) so that the setting button aIL1 has a distance between the rotating side rotary transformer (21) and the stationary side rotary transformer (40). The fitting method is performed by shrink fitting, press fitting, or fixing with adhesive. Next, take the axis reference of the shaft bearing (27) to the A side (magnetic head chip mounting surface).
24a)), B side (upper tram fitting part (28a)), and C side (upper tram mounting surface (29a)) are finished. Finishing machining brings surfaces A, B, and C to the specified accuracy based on the rotation axis. In Fig. 5, a plurality of magnetic helad chips (2) are mounted on the magnetic head chip mounting surface (24b) of the stepped flange plate (23) with a predetermined accuracy (protrusion amount, mounting posture, magnetic head mounting angle (indexing amount)). Attach with adhesive (25) while adjusting with a jig so that the After that, a winding process is performed. The signal transmitted from the rotary transformer (21) on the rotating side via the relay wire (33) is transferred to the stepped flange plate (
23) Connected to the magnetic helad chip (2) via the relay board (26) pasted on top. Figure 6 shows the upper tram (
1) Shows where to attach. Upper drum (1) in the figure
The fitting part (42) and the upper drum fitting part (28b) of the stepped flange plate (23) fit together and are fixed by a plurality of screws (19). Next, install the step adjustment screw (3
0) to push and pull the stepped flange plate (23) to adjust the head height (step) of the plurality of Rad chips (2). This will be explained with reference to FIG. Push and pull adjustment in the head movement direction (45) using the step adjustment screw (30), and adjust the deviation L2 at the lower end of the head gap (44), which is called a head height deviation or head step, to be within a predetermined range. In the above embodiment, a jig (not shown) was used to position the stepped flange plate (23) and the rotary transformer (21) on the rotating side. In the above embodiment, the height of the magnetic head chip (2) is adjusted using the screw (30) in the drum unit. It can be omitted if high-precision assembly is performed. Further, in the above embodiment, a shaft bearing with a sleeve (27) is shown as the bearing of the drum unit, but a normal shaft bearing without a sleeve or a ball bearing may be used. Furthermore, in the above embodiment, the fitting part (28b) provided on the stepped flange plate (23) was used to position the upper drum (1) and the stepped flange plate (23) in the radial direction. It may also be used as a bearing shaft.

Furthermore, in the above embodiment, the shaft bearing (27) is fitted to the lower drum (13) first (Fig. 3), but as shown in Fig. 8, the stepped flange plate (23) is fitted to the shaft. With bearing (27
The same effect can be achieved by fitting and fixing the lower drum (13) onto the shaft of the lower drum (13). In addition,
In the above embodiment, the stepped flange plate (23) is used as the stepped plate.
However, a stepped rectangular shape may also be used, and the so-called upper drum (1
) can be attached, and if the shape is such that it can be fitted and fixed to the drum shaft, the same effects as in the above embodiments can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, after finishing a single stepped plate on which the rotary transformer on the rotating side is attached and attached to the lower drum of the shaft bearing, the magnetic herad chip is attached. Therefore, the complicated head mounting process,
This has the effect of reducing work time due to the simplification of processes such as routing of signal lines.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a drum unit showing an embodiment of the present invention, Fig. 2 is a sectional view of a rotating side rotary transformer attached to a stepped flange plate, and Fig. 3 is a sectional view of a shaft bearing fitted to the lower drum. Figure 4 is an assembled cross-sectional view of the parts shown in Figures 2 and 3 fitted together, Figure 5 is a cross-sectional view of the magnetic helad tip mounted, and Figure 6 is the installation of the upper drum. 7 is an enlarged view of the head gap surface illustrating the step adjustment of the magnetic helad tip. FIG. 8 is a sectional view showing the assembly process according to another embodiment of the present invention. FIG. 9 is a conventional one. Fig. 10 is a perspective view showing the entire normal drum unit, Fig. 11 is a plan view showing the magnetic rad mount of
FIG. 2 is a sectional view of the drum unit shown in FIG. In the figure, (1) is the upper drum, (2) is the magnetic helad tip, (13) is the lower drum, (21) is the rotating side rotary transformer, (23) is the stepped flange plate, (26) is the relay board, (27) is a shaft bearing (30) is a step adjustment screw, (
33) indicates a trunk line. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) It is equipped with a magnetic head and consists of a rotating rotary drum and a fixed fixed 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. In the drum unit configured to form a drum unit, the magnetic head and the rotating side rotary transformer are attached to a stepped plate that is integrally attached to the rotating shaft, and the rotating drum is attached to the plate surface. Characteristic drum unit.