JP3334204B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus suitable for use in a camera-integrated VTR, and more particularly to a structure for supporting a rotary head drum and a guide block of a tape pull-out guide member.

[0002]

2. Description of the Related Art Conventionally, a rotary head drum and a guide block of a tape pull-out guide member for winding a tape around the rotary head drum are supported by dedicated bases for holding the tape in a predetermined inclined state. ing.

[0003] When these bases are formed by, for example, die-casting, positional accuracy is adjusted by cutting a necessary portion of the base.

[0004] In addition to the die casting, there is an injection molding of each of the above-mentioned bases with a high precision resin.

[0005]

However, die cast molding requires a short life of the molding die of the base and requires a large number of molding steps of the base. In addition, special equipment for cutting for adjusting the positional accuracy is required. Due to this, there is a problem that the die casting of the base increases the manufacturing cost.

On the other hand, injection molding using a high precision resin is difficult to produce a molding die, and the higher the precision resin, the more expensive the molding die and the shorter the life of the die. In comparison, the production cost is more expensive.
In addition, in the case of a high-precision resin, there is also a problem that the accuracy of a molded product is hardly obtained due to variations in molding conditions.

Further, in any of the above-mentioned cases, the conventional method of fixing the rotary head drum to the base is such that the periphery of the fixed-side drum bottom of the rotary head drum is fastened and fixed at three points with screws. , 3 points flatness is correct
If not, the leads of the rotary head drum are deformed by tightening the three points, resulting in a problem that the linearity of the tape video track wound on the rotary head drum is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the guide block of the rotary head drum and the tape pull-out guide member can be formed with high precision at a low cost without using die casting or high precision resin. It is an object of the present invention to provide a recording / reproducing apparatus which can be manufactured and does not cause deformation of a lead of a rotary head drum.

[0009]

[SUMMARY OF] To achieve the above object, a recording and reproducing apparatus according to the present invention, the rotary head drum
The bottom peripheral surface of the fixed drum is one
It is held in an inclined manner by a plurality of first support pieces erected on the body.
And the center of the bottom of the fixed drum is
Via a coil spring from the support base to the raised support base
Fixed with screw shaft, position guide block from support base
A plurality of second support pieces for fixing and holding are integrally erected, and
A plurality of the second support pieces are integrally formed on a guide block.
Welding and fixing the above guide block via welding fixing pieces
It is like that .

[0010]

According to the recording / reproducing apparatus of the present invention having the above-described structure, the first support for holding the rotary head drum in an inclined shape is provided.
The second support for positioning and holding the holding piece and the guide block
Sheets can be integrally processed from a single support base.
The use of expensive molding dies
Can be manufactured. In particular, a guide block to the second support piece
Is fixed to the guide block by welding.
And fix it to the second support by welding.
Therefore, highly accurate positioning can be performed.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of a support base of a rotary head drum in a camera-integrated VTR, in which a guide block of a tape pull-out guide member is fixed, and FIG. 2 is a plan view of only the support base.

In both figures, a support base 1 is designated by the reference numeral 1 as a whole.
The support base 1 is manufactured by, for example, sheet metal processing of an aluminum material, and is fixed to a chassis (not shown) by a plurality of fixing pieces 2. On the support base 1, support pieces 4a, 4b, and 4c on which a rotary head drum 3 indicated by phantom lines is supported at substantially equal three points are integrally bent and erected.

The rotary head drum 3 has a bottom peripheral surface mounted on the distal end portions of the support pieces 4a, 4b, 4c with a uniform mounting load, and is provided with a predetermined inclination angle in which the tape entrance side is inclined low. (See FIG. 3). Specifically, it is ideal that the rotary head drum 3 is supported by the support pieces 4a, 4b, and 4c in a state close to point contact. For example, the tip of the support pieces 4a, 4b, and 4c is formed by using the support piece 4a as an example. To explain, a polygonal surface 5 close to an arc shape as shown in FIG.
And the width in the thickness direction is formed thin.

At substantially the center of the support base 1 surrounded by the support pieces 4a, 4b, and 4c, a holding portion 6 for holding the rotary head drum 3 at one place is provided. The holding portion 6 is located at the center axis position of the rotary head drum 3 (see FIG. 1).
(Point a in FIG. 3). In other words, it is avoided from the lead wire for wiring drawn from the center of the fixed head 7 which is coaxial with the center axis of the rotary head drum 3.

The structure for holding the rotary head drum 3 is as shown in FIG. That is, the holding portion 6 is formed of a support base integrally formed with the support base 1 by a protruding process, and has a shaft hole 6a formed at the center thereof.

The procedure for holding the rotating head drum 3 is as follows.
While placing the bottom surface of the fixed-side drum 7 of the rotary head drum 3 on the support bases 4a, 4b, and 4c described above, the support base 1
In a state where the shaft 10 is positioned on the shaft 1 a and the dowel 1 b (see FIG. 1) protruding from the shaft, the shaft 10 into which the coil spring 8 and the washer 9 are inserted is inserted into the shaft hole of the holder 6 from the back side of the support base 1. 6a, the shaft 10 is inserted.
The flange portion 10a of the shaft portion 10 abuts against the bottom surface of the fixed-side drum 7 against the screw hole 12 formed at a position avoiding the screw portion 11 formed at the tip of the fixed drum 7 from the lead wire drawn out from the bottom surface of the fixed-side drum 7. Screw it in.

As a result, the coil spring 8 has the washer 9 in contact with the back surface of the holding portion 6 and the head 10 of the shaft portion 10.
b, and the compression spring acting force of the coil spring 8 becomes a holding force for holding the rotary head drum 3 on the support pieces 4a, 4b, 4c.

On the other hand, a pair of left and right guide blocks 13 and 14 are fixed to the support base 1 above the rotating head drum 3 (upper side in FIG. 1) with a predetermined inclination angle. The guide blocks 13 and 14 are for positioning a tape pull-out guide member for winding the tape around the rotary head drum 3.
The guide blocks 1 and 3 are manufactured by sheet metal processing of an aluminum material similarly to the support base 1.
In the case of 3, 14 the surface is molybdenum dioxide (MoS
₂ ) Surface treatment.

As shown in FIG. 1, each of the guide blocks 13 and 14 is provided with three support pieces 15a, 15b, 15c and 16a, which are bent and raised from the support base 1 and stand upright.
6b, 16c.

Here, the configuration of the guide block and the details of fixing to the support base 1 will be described with reference to FIGS. 5 and 6 by taking one of the guide blocks 13 as an example. Welding fixing pieces 13a, 13b (13c not shown) are provided at positions corresponding to the supporting pieces 15a, 15b, (15c not shown) of the support base 1.
Are integrally molded, and these welding fixtures are flattened using a jig.
After correcting the flatness , the welding fixing pieces 13a and 13b are placed on the corresponding supporting pieces 15a and 15b, and the joints are welded by laser light, for example, and the guide block 13 is fixed at a predetermined inclination angle. I have.

In the above-described guide block 13, a tape pull-out guide member 17 indicated by a virtual line is engaged with a rotating head drum (not shown) when the tape is wound (tape loading state), and provided on the guide block 13. The position is fixed by being pressed against the lock screw 18. 1
Reference numerals 9 and 20 denote guide poles and inclined guides which move integrally with the tape pull-out guide member 17. The tape pull-out guide member 17 is movable along a guide groove 21 formed in a chassis (not shown) as shown by a virtual line in FIG.

In the recording / reproducing apparatus according to the present invention having the above-described configuration, the support base 1 for holding the rotary head drum 3 and the guide blocks 13 and 14 are manufactured by sheet metal processing of an aluminum material. In addition, the processing of the guide blocks 13 and 14 can be performed without using an expensive molding die, the production tact is shortened, the life of the molding die is long, and the unit price of the molded product is extremely low.

The holding of the rotary head drum 3 with respect to the support base 1 is carried out by fixing the bottom peripheral surface of the fixed head 7 to the support base 1.
The support pieces 4a to 4c which are erected from the rotary head drum 3 are received at three places, and the bottom of the eccentric fixed side head 7 near the center axis of the rotary head drum 3 is tightened and fixed by one shaft section 10. The effect that the lead of the rotary head drum 3 is deformed can be eliminated.

Further, the guide block 1 which has been subjected to sheet metal processing.
Since the members 3 and 14 are fixed to the support base 1 similarly processed by sheet metal and then fixed by welding after adjusting the position and angle accuracy by a jig, the position can be set with high precision as in the conventional die-cast guide block. .

Further, since the surfaces of the guide blocks 13 and 14 are plated with molybdenum disulfide, the lubricity of the guide block surface is high, and therefore, there is no unnecessary friction between the guide blocks 13 and 14 and the tape pull-out guide member 16. It is possible to slide smoothly.

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

[0027]

As described above, the recording / reproducing apparatus according to the present invention can be applied to the peripheral portion of the bottom of the fixed drum of the rotary head drum.
The surface of a plurality of
1 and is fixed in an inclined manner by the support piece.
Almost the center of the bottom of the side drum was raised from the support base
It is fixed with one screw shaft with a coil spring interposed on the support base.
The guide block is positioned and held from the support base.
A plurality of second support pieces are integrally erected, and the second support pieces are
Via a plurality of welding fixing pieces integrally formed on the guide block
To fix the guide block by welding.
Manufacture of holding base without using expensive molding dies
it can. Moreover, the guide block is mounted on the second support piece.
Attach the welding fixed piece integrally molded to the guide block.
The guide block was fixed by welding to the support piece of No. 2.
Positioning can be performed with high accuracy. At this time,
For example, use a jig to adjust the flatness of the lock welding fixture.
If you fix it to the second support piece by welding,
High-precision position similar to die-cast guide blocks
Can be delivered. Also supports the bottom peripheral surface of the fixed drum.
Received by a plurality of support pieces standing upright from the holding base, fixed drum
The coil is placed on the support base where the center of the
It is fixed with one screw via a spring.
The lead of the transfer head drum is not deformed.

[Brief description of the drawings]

FIG. 1 is a plan view showing a mounted state of a support base and a guide block according to the present embodiment.

FIG. 2 is a plan view of only a support base.

FIG. 3 is a partial sectional view of a holding structure of a rotary head drum.

FIG. 4 is a perspective view of a support piece of the rotary head drum.

FIG. 5 is a side view of a fixing structure of the guide block.

FIG. 6 is a perspective view of a part of a guide block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support base 3 Rotating head drum 4a, 4b, 4c Support piece 5 Polygon surface 6 Support stand 7 Fixed drum 8 Coil spring 10 Shaft part 11 Screw part 13, 14 Guide block 15a, 15b, 15c Support piece 16a, 16b, 16c Supporting pieces 13a, 13b, 13c Welding fixing pieces 17 Tape pull-out guide member 18 Lock screw

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/61 G11B 33/12

Claims (3)

(57) [Claims] 1. A pair of tape drawers on a rotary head drum
The tape is helically wound by the guide member,
When the tape has been wound, the tape
In the recording / reproducing apparatus which is positioned and held by the guide block, the bottom peripheral surface of the fixed-side drum of the rotary head drum is formed of sheet metal.
A plurality of first supports integrally standing from the processed support base
And the fixed side drum
The center of the bottom of the support is raised from the above support base
The guide block is fixed to the base with a single screw shaft with a coil spring interposed between the support base and the guide block.
A plurality of second support pieces are integrally erected, and the second support
A plurality of welded solids formed integrally with the guide block
A recording / reproducing apparatus characterized by being fixed by welding through a fixed piece . 2. The fixed-side drum of the rotary head drum
The recording / reproducing apparatus according to claim 1, wherein a bottom portion is point-contacted with and held by the first support piece . 3. The surface of the guide block is formed of
2. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing apparatus is plated with butene .