JPH06150473A - Rotary drum fitting method - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to make a system light in weight and low in cost by using an integrally molded elastic body instead of the conventional compression coil spring when a rotary drum is fixed to a drum base. CONSTITUTION:When the rotary drum 1 is fitted, a drum screw 4 is passed through a leaf spring 3 and the drum base 2, and is screwed into a screw hole 1a of the rotary drum 1. At this time, appropriate elastic force is generated in a part of a protrusion part 3b of the leaf spring 3. By this method, the drum 1 can be abutted on the drum base 2, thus obtaining an equal effect with the conventional plural compression coil springs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting method for fixing a rotary drum used in a VTR or the like to a drum base.

[0002]

2. Description of the Related Art In a VTR or the like, when a rotary drum is fixed to its drum base with screws, the flatness tolerance of the joining surface of the rotary drum causes distortion in the rotary drum, which deteriorates the accuracy of recording tracks. . Therefore, conventionally, by increasing the thickness of the rotary drum, the strength thereof is increased, or a compression coil spring is attached to each mounting screw,
The rotary drum is configured to come into pressure contact with the screws.

[0003]

However, in such a conventional rotary drum mounting method, when the thickness of the rotary drum is increased first, the weight of the apparatus is increased and the request for weight reduction can be effectively met. could not. When a compression coil spring is used, each screw is fixed via the spring, which not only increases the number of parts but also deteriorates the assemblability, resulting in cost increase. .

In view of the above situation, it is an object of the present invention to provide a rotary drum mounting method which can reduce the number of parts, effectively reduce the weight and reduce the cost.

[0005]

The rotary drum mounting method of the present invention is such that when the rotary drum is fixed to the drum base by a plurality of screws, the rotary drum is mounted via an integrally molded elastic body.

[0006]

According to the method of the present invention, by using an integrally molded elastic body instead of a plurality of compression coil springs,
It is possible to mount the rotary drum while suppressing an increase in the weight and parts of the rotary drum.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a rotary drum mounting method according to the present invention will be described below with reference to FIG. In FIG. 1, 1
Is a rotary drum, 2 is a drum stand, 3 is a leaf spring, 4 is a drum screw that penetrates through the leaf spring 3 and the drum stand 2, and is screwed into a screw hole 1a of the rotary drum 1 to be fixed, and 5 is a chassis,
Reference numeral 6 denotes a fixing screw that is screwed into the screw hole 5a of the chassis 5 to fix the drum base 2 to the chassis 5. The leaf spring 3
Is formed in a ring shape in the illustrated example, and the hole 3a through which each drum screw 4 penetrates is provided in the protrusion 3b.

According to the method of the present invention, when the rotary drum 1 is mounted, the drum screw 4 is passed through the leaf spring 3 and the drum base 2 and screwed into the screw hole 1a of the rotary drum 1.
Appropriate elasticity is generated at the protruding portion 3b of the leaf spring 3. As a result, the rotary drum 1 can be pressed against the drum base 2, and an effect equivalent to that of a plurality of compression coil springs used conventionally can be obtained. Moreover, in this case, one leaf spring 3 can be substituted for a plurality of compression coil springs, the assemblability is improved, and the cost can be effectively reduced.

FIG. 2 shows a second embodiment of the rotary drum mounting method according to the present invention. In the figure, 7 is a rotary drum, 8 is a drum stand having holes 8a, and 9 is a chassis. The chassis 9 has a plurality of elastic projections 9a.
Are integrally molded. Further, 10 is a drum stop screw, and this drum stop screw 10 penetrates the hole 9b of the projecting piece 9a and the hole 8a of the drum base 8 and is screwed into the screw hole 7a of the rotary drum 7. . In the drum base 8, the hole 8a is provided in the recess 8b.

According to the second embodiment of the method of the present invention, the drum stop screw 10 is passed through the projecting piece 9a and the drum base 8,
By being screwed into the screw hole 7a of the rotary drum 7, appropriate elasticity is generated in the protruding piece 9a portion, whereby the rotary drum 7 can be pressed against the drum base 8. In this case, since the projecting piece 9a is integrally formed on the chassis 9 itself, the number of parts is further reduced, and the assemblability is improved and the cost is further promoted.

In the first embodiment, instead of the leaf spring 3, for example, an annular rubber body having a hole for penetrating the drum screw 4 may be used. Can be obtained.

[0012]

As described above, in a VTR or the like, when a rotary drum is fixed to a drum base, an integrally molded elastic body is used in place of a plurality of compression coil springs that have been conventionally used. It has the advantages that the assemblability can be improved and the cost can be effectively reduced while reducing the number of parts and reducing the weight.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts according to a first embodiment of a rotating drum mounting method of the present invention.

FIG. 2 is an exploded perspective view of essential parts according to a second embodiment of the rotating drum mounting method of the present invention.

[Explanation of symbols]

 1,7 Rotating drum 2,8 Drum base 3 Leaf spring 3b Projection 4 Drum screw 5,9 Chassis 6 Stop screw 9a Projection piece 10 Drum stop screw

Claims (3)

[Claims] 1. A method for mounting a rotary drum, characterized in that, when the rotary drum is fixed to a drum base with a plurality of screws, the rotary drum is mounted via an integrally molded elastic body. 2. The rotating drum mounting method according to claim 1, wherein the elastic body is a ring-shaped leaf spring having a protrusion formed on a corresponding portion of the screw. 3. The method for mounting a rotary drum according to claim 1, wherein the elastic body is a protrusion integrally formed with a chassis that supports the rotary drum.