JPS6182359A - Drum fitting structure of recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a drum equipped with a rotating magnetic head for recording and reading information on a magnetic tape! , relates to a drum mounting structure for a recording/reproducing device that can be accurately mounted on a reference surface of a chassis.

[Conventional technology]

As a method for attaching to the reference surface of the drum chassis of a recording/playback device (video tape recorder).

As shown in Figure 5, the IAK drum 2 on the reference surface of the chassis 1 can be directly attached using the mounting screws 3, or as shown in Figure 6, the IAK drum 2 can be attached to the reference surface of the chassis 1 through the biasing force of a coiled spring 4. There is a method of installing IBVC with mounting screw 3.

[Problem to be solved by the invention]

When fixing the drum 2 to the chassis 1 as shown in FIG. There are problems such as 2 being tilted and difficult to install.

When fixing the chassis 1 and the VC drum 2 as shown in Fig. 6, the movement stroke is long as the drum 2 floats above the reference surface due to impact, etc., so when installing other parts on the upper side of the drum 2. It is necessary to secure an appropriate space and install a separate device, or to provide a separate means for regulating the movement stroke of the drum 2.Also, the positional accuracy of the drum 2 after it has moved due to impact etc. is determined by the mounting screw 3. Since the insertion is determined by the accuracy of the hole 1B, there is a problem that the positional accuracy of the drum 2 is not very good.

This invention was made to solve the above-mentioned problems21.
A drum mounting structure for a recording/reproducing device that allows the drum to be mounted on the chassis with a fixed position, without deforming the lead surface of the drum, and with good positioning accuracy on the reference surface, and to prevent movement of dandruff due to impact, etc. This is what we provide.

[Kth method to solve the problem]

Fig. 1 is a side view showing one embodiment of the present invention;
) and (b) are a bottom view of the drum and an enlarged view of the mounting screws.

In these figures, 11 is a chassis, 11 is a screw hole provided in the chassis 11vc, and 12.13 is a plurality of bosses provided in the chassis 111/c.
2 constitutes a reference surface 12A, and each boss 13 is provided with a positioning pin 13.

Reference numeral 14 denotes a drum, which is composed of an upper drum 15, a lower drum 16 containing the motor, and a plastic attachment part 17 attached to the lower drum 16 with screws 1B. and,
The lower drum 16 is provided with a plurality of recesses 16A into which a plurality of positioning pins 13A are inserted, and the mounting portion 1.7VC is provided with a mounting hole 17A.

A mounting screw 19 is inserted into the mounting hole 17AVc, and is composed of a threaded portion 19A that is threaded into the threaded hole 11A, a shaft portion 19C, and a head portion 19D.

20 is a coiled spring inserted into the mounting screw 19;
1 is a washer that abuts the second step portion 19CVc, 22
is a plastic washer which locks the spring 20 and the washer 21 to the mounting screw 19 by the radial contraction force of the mounting screw 19. Note that the length of the positioning pin 13 that fits into the recess 16AK is such that the spring 20 is reduced and the washer 21
is longer than the moving stroke that abuts the second step 19CK.

[Effect]

Next, how to attach the drum 14 will be explained.

Lower drum 16Vc mounting part 17'? : Attach with screws 18, incorporate upper drum 15Y, and assemble drum 14.

At this time, since the mounting portion 1T is made of plastic, the lead surface provided on the outer periphery of the lower drum 16 will not be deformed by tightening the screw 18.

Then, the positioning pin 1 is inserted into the recess 16A of the lower drum 16.
3Ag are inserted and placed on the reference surface 12AVc drum 14, the lower drums 21 and 22 shown in FIG. 2(a) and Vc are assembled as shown in FIG.
When it is partially installed, the threaded portion 19A is screwed into the screw hole 11A, the first stepped portion 19B comes into contact with the chassis 11, a gap is created between the second stepped portion 19C and the washer 21, and the biasing force of the spring 2o is With 14 drums, 12AK can be pressed and fixed.

When the drum 14 is attached to the chassis 11 as described above, the urging force of the spring 20 presses the reference surface 12AK of the drum 14, so that the drum 14 does not tilt
I can do it.

Further, when the drum 14 is moved by compressing the spring 20 due to an impact or the like, the mounting portion 17 comes into contact with the second step portion 19CVc via the washers 21, 22'e and moves! Therefore, the movement stroke of the drum 14 is restricted, and the upper part of the drum 14 can be used effectively.

Furthermore, the positional accuracy due to the impact of the drum 14, etc. is achieved by guiding the movement of the lower drum 16 with the positioning pin 13A, so that the reference surface 12AK of the chassis 11 can be positioned with high positional accuracy.

Note that the first step 19B and the second step 1 of the mounting screw 19
The difference in diameter of 9C is about 70.5 to 1mm, and the head 19D is small! When used, the mounting space for the drum 14 is found to be smaller than the built-in motor.

〔Example〕

FIG. 3 is an enlarged view showing the mounting screw portion of another embodiment of the present invention, and the same reference numerals as in FIG. 1 indicate the same parts l.

In this figure, reference numeral 23 denotes a mounting screw inserted through the mounting hole 17AK, which includes a threaded portion 23A screwed into the threaded hole 11AK, a first stepped portion 23B having a larger diameter than the threaded portion 23A that contacts the chassis 11, and a mounting portion. The first stepped portion 23B that comes into contact with 17
It is composed of a second step portion 23C having a larger diameter than the head portion 23D, and a head portion 23D.

As shown in Fig. 3, use the mounting screw 23Y to press the drum 14 on the chassis 11 reference surface 12A with the biasing force of the spring 20.
When fixed, even if the drum 14 moves due to an impact or the like, the movement of the mounting part 17 can be sufficiently restricted by the second stepped part 23C.
It can be omitted and the same effect can be obtained.

FIG. 4 is a partially cutaway side view showing still another embodiment 2 of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts.

In this figure, 24 is a chassis, 24A is a reference surface of the chassis 24, and a plurality of positioning pins 24B are provided. The drum 14 of this embodiment is composed of only upper and lower drums 15 and 16.

In the embodiment shown in FIG. 4, the mounting portion 17Y in the embodiments shown in FIGS. 1 and 3 can be omitted, and the drum 14'Y can be mounted on the chassis 24 with mounting screws 19 or the like. Then, substantially the same effect as the embodiments shown in FIGS. 1 and 3 can be obtained.

〔Effect of the invention〕

As explained above, the drum mounting structure of the recording/reproducing apparatus of the present invention is such that the drum is mounted on the reference surface of the chassis by being pressed by the biasing force of the biasing means, and the movement stroke Z of the drum due to impact etc. The structure is such that the movement of the drum is regulated by the second step and the positioning pin is used to guide the movement of the drum, so that the drum lead surface can be mounted with high positional accuracy (reference surface roughness) without deforming. Since the movement of the drum is restricted by the second stage of the drum, there are advantages such as the space above the drum can be used effectively.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
), (b) is a bottom view of the drum and an enlarged view of the mounting screw, FIG. 3 is an enlarged view showing the mounting screw portion of another embodiment of the present invention, and FIG. 4 is a still another embodiment of the present invention. FIG. 5 is a partially cutaway side view shown in FIG. FIG. 6 is a partially cutaway side view showing a conventional example. In the figure, 11 is the chassis, 11A is a screw hole, 12° 13 is a boss, 12A is a reference plane, 13A is a positioning pin, 14 is a drum, 16A is a recess, 19 is a mounting screw, 19B is a first
19C is a second step, and 20 is a spring. Figure 1 Figure 2 (a), (b) Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A reference surface and a positioning pin are provided on the chassis, and a drum provided with a recess into which the positioning pin is inserted is pressed against the reference surface using a mounting screw provided with a first step and a second step using a biasing means. The recording/reproducing device is mounted as a recording/reproducing device, and the positioning pin does not come out of the recess during a movement stroke in which the drum is separated from the reference surface and the chassis or the drum comes into contact with the second step. Drum mounting structure.