JPH0743790Y2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a magnetic recording / reproducing apparatus such as a microminiature VTR in which a magnetic tape is spliced and run on a drum having a rotating magnetic head. The guide rails for a pair of loading members to be wound around the drum are directly attached to the drum so that the space between the drum and the chassis is effectively used.

[Prior Art] In this type of VTR, conventionally, a guide rail is arranged outside the drum, and the legs of the guide rail are fixed to the chassis by screws.

In the structure of fixing the guide rail on the chassis, a loading mechanism such as a loading ring for driving the loading member cannot be arranged below the drum and cannot be connected to the pole base of the loading member. , It should be placed outside the drum or below the chassis.

[Problems to be solved by the invention] However, disposing the loading ring on the outside of the drum requires a large space in the circumferential direction on the outside of the drum, and the inner circumference of the loading ring has a large diameter. There is also the problem that it is difficult to obtain the strength of the ring.

Also, disposing the loading ring below the chassis requires a large space below the chassis because the loading mechanism protrudes below the chassis, and it is necessary to form a guide hole in the chassis to connect the loading ring and the pole base. Therefore, there is a problem that the strength of the chassis becomes weak.

Therefore, in a model such as a VTR with a built-in camera, which is required to be further downsized, improvement in space is particularly desirable.

Therefore, an object of the present invention is to move a pair of loading members for winding a tape drawn out from a cassette around a drum along a guide rail, and to install a loading mechanism such as a loading ring by directly attaching the guide rail to the drum. It is an object of the present invention to provide a magnetic recording / reproducing apparatus which can be arranged in the space between the drum and the chassis, and therefore can be made compact and at the same time have sufficient strength of the loading ring and the chassis.

[Means for Solving the Problems] In order to solve the above problems, the present invention draws out a magnetic tape from a cassette by a pair of loading members that respectively move along guide rails, and the tape is mounted on a drum having a rotating magnetic head. In a magnetic recording / reproducing apparatus in which a lower fixed drum is mounted on a chassis via a drum base, and the drum base is separated to form the guide rail. Is directly attached to the lower fixed drum.

[Operation] Since the guide rail formed by the separated drum base is directly attached to the lower fixed drum,
It is possible to arrange a loading mechanism such as a loading ring by utilizing a space between the chassis below the drum.

[Example] An example will be described below with reference to the accompanying drawings.

First, showing the relationship between the drum and the guide rail according to the present invention
In FIG. 2 and FIG. 2, 1 is a chassis, 2 is a drum, and 10
Is a drum bass.

As shown in FIG. 2, the drum 2 has an upper rotary drum 4 fixed to a rotary shaft 3 and a rotary shaft 3 supported by a lower fixed drum 6. A magnetic (video) head 5 and a flying erase head (not shown) are incorporated in the lower end of the upper rotary drum 4, and a tape guide lead 7 is formed on the outer peripheral surface of the lower fixed drum 6. Further, a spacer 8 is provided between the lower fixed drum 6 near the center of the lower surface and the chassis 1 and fixed by a screw 9.

As shown in FIG. 2, the drum base 10 includes a pair of left and right resin guide rails 21, 3 made of a light alloy drum base body 11.
It is composed of a separate structure with 1.

That is, the drum base body 11 is formed with a pair of left and right guide grooves 12, 13 and respective stopper portions 14, 15 provided near the respective end portions thereof, and as shown in FIG. 17
Are fixed to the chassis 1 with screws. This drum base main body 11 has inner left and right mounting parts 18, 18 and respective screws 19, 19
It is connected to the lower surface of the lower fixed drum 6 (see FIG. 2).

The guide rail 21 on the left side of the drawing is formed with a guide portion 22 connected to the inside of the guide groove 12 on the outer circumference, and as shown in FIG. 1, two mounting pieces 23, 23 at the inner circumference are provided with respective screws. 2
4, 24 (see FIG. 2) are connected to the lower surface of the lower fixed drum 6.

Further, the guide rail 31 on the right side in the figure has a thick guide portion 32 formed along the inner side of the guide groove 13 formed on the outer periphery thereof, and as shown in FIG. The screws are connected to the lower surface of the lower fixed drum 6 by screws 34, 34 (see FIG. 2).

Therefore, the above two guide rails 21 and 31 are fixed guide rails on the drum side.

As shown in FIG. 1, an outer guide rail 25, which is also made of resin, is arranged outside the guide rail 21.
This outer guide rail 25 is formed with a guide portion 26 on the inner periphery that faces the guide portion 22 and is connected along the outside of the guide groove 12, and is provided on three mounting pieces 27, 28, 29 on the outer periphery. Are fixed to the chassis 1 with screws.

Thus, only the outer guide rail 26 is the chassis side fixed guide rail.

Next, the loading member that is moved by the above guide rail structure will be described.

The loading member 41 shown in FIG. 3 comprises a guide roller 43 and an inclined pole 44 which are provided on a pole base 42, and two guide pins 45, 45 are vertically provided under the pole base 42. The guide portions 22 and 26 and the guide groove 12 are engaged with the guide pins 45 and 45. In the figure, the inclined pole 44 is inclined toward the guide roller 43 side.
A connecting plate 49 is rotatably provided below the head of the guide pin 45 on the 44 side via a connecting pin 48.

The loading member 51 shown in FIG. 4 also has a guide roller 53 and an inclined pole 54 provided upright on a pole base 52, and one guide pin 55 is vertically provided below the pole base 52 on the guide roller 53 side. ing. And in the figure, a guide roller
The tilted pole 54 is tilted on the side opposite to 53, and the pole base
A connecting plate 59 is rotatably provided on the lower inclined pole 54 side via a connecting pin 58. Further pole base 52
Upper and lower rail fitting portions 56, 57 protruding to the side surface of the rail fitting portion are provided, and the rail fitting portions 56, 57 engage with the thick guide portion 32. A guide pin 55 and a connecting pin 58 are engaged with the guide groove 13. The lower rail fitting portion 56 is formed integrally with the pole base 52, and the upper rail fitting portion 57 is screwed to the upper surface of the pole base 52.

Next, FIG. 5 showing the loading mechanism 60 of the pole bases 42, 52 will be described.

In FIG. 5, 61 is a loading ring, 66 is a middle gear, 71 is a tape feeding side slide plate, 76 is the same link gear, and 81 is a tape winding side slide plate,
Both slide plates 71, 81 are arranged on the loading ring 61.

That is, the tape feeding side slide plate 71 is assembled by engaging the three guide pins 72 in the circumferential direction with the guide holes 62 (see FIG. 6) of the loading ring 61, and the tape winding side slide plate 81 is set in the circumferential direction. The guide pins 63 of the loading ring 61 are engaged with the two guide holes 83 to be assembled. Tension springs 75, 85 are stretched between the loading ring 61 and the slide plates 71, 81, respectively, and 64, 74, 84 are arcuate holes for spring storage. Further, teeth 65 are provided on the outer periphery of the loading ring 61.
Is formed, and a gear for power transmission rotated by the driving of a loading motor (not shown) is meshed with the tooth portion 65.

A tooth portion 73 is formed on the inner circumference of the tape supply side slide plate 71. The middle gear 66 meshes with the tooth portion 73, and a link gear 76 meshing with the middle gear 66 also forms a plate 71.
It is located facing upwards. A connecting pin 78 is provided at the tip of the lever portion 77 protruding from the link gear 76, and the connecting plate 49 provided on the pole base 42 is rotatably connected to the connecting pin 78.

A connecting pin 88 is also provided at the tip of the lever portion 87 that is bent from the tape winding side slide plate 81, and the connecting plate 59 provided on the pole base 52 is rotatably connected to the connecting pin 88. Has been done.

Incidentally, as shown in FIG. 6, the loading ring 61 has its inner periphery supported by the outer peripheral grooves of the three guide rollers 67 including the lower portion of the middle gear 66. Then, the driving force is transmitted to the loading ring 61 and the middle gear 66 through a power transmission gear that is rotated by the driving of a loading motor (not shown), and the loading members 41 and 51 are moved.

The above-mentioned loading mechanism 60 is arranged on the chassis 1 below the drum 2 as shown in FIG. A drive ring (not shown) is arranged below the loading ring 61, and another power transmission gear, a loading motor, and the like are arranged outside the drive ring.

FIG. 9 shows a tape path in a recording / playback state in a VTR as an example. 91 is an audio / control head arranged on the tape winding side, 92 is the same middle pole, 93 is the same tilt pole, and 94 is the same. The guide pole, 95 is the pinch roller, 96 is the capstan, 97 is an impedance roller arranged on the tape supply side, 98 is the inclined pole,
99 is the same tension pole, 100 is a tape cassette, 101 is a magnetic tape, 102 is a supply reel, and 103 is a take-up reel.

Incidentally, the magnetic tape 101 from the tape cassette 100 as shown.
When pulling out, the middle 92, the pinch roller 95, and the tension pole 99 are also moved.

Next, the movement of the loading members 41, 51 on the tape inlet / outlet side with respect to the drum 2 will be described with reference to FIGS. 6 to 8.

FIG. 6 shows the non-loading state, that is, the stop state. In this state, as shown in the drawing, the pole base 42 on the tape supply side is engaged with the guide portions 22 and 26 and positioned on the starting end side, and the pole base 42 on the tape winding side is also attached to the thick guide portion 32. They are engaged with each other and are located on the starting end side.

When the loading ring 61 rotates counterclockwise in the figure from this state, the tape winding side slide plate 81 and the tape supply side slide plate 71 also rotate counterclockwise in the figure. Then, the link gear 76 rotates together with the middle gear 66 meshing with the tape supply side slide plate 71. That is, the tape supply side slide plate 71 rotates counterclockwise in the figure and the link gear 76 rotates clockwise in the figure.

Therefore, as shown in FIG. 7, the tape supply side pole base 42 pivotally connected to the lever portion 77 of the link gear 76 via the connecting link 49 is guided along the guide portions 22 and 26 to the guide groove 1 on the end portion side.
The pole base 52 on the tape take-up side, which moves toward 2 and is pivotally connected to the lever portion 87 of the slide plate 81 on the tape take-up side via the connecting link 59, is used as the guide portion 32.
And moves toward the guide groove 13 on the terminal end side.

Thus, as shown in FIG. 8, the pole base 42 on the tape supply side
Is located on the end side of the guide groove 12 from the guide portions 22 and 26,
The guide roller 43 moves until it engages with the stopper portion 14, and the pole base 52 on the tape winding side is guided by the guide portion.
32 from the end of the guide groove 13 to the guide roller 53
Moves until it engages with the stopper portion 15.

This state is the time when the loading is completed, that is, the cassette 100 is set by the both guide rollers 43, 53 and the inclined poles 44, 54.
The magnetic tape 101 drawn from the right and left sides of the drum is wound around the outer peripheral surface of the drum 2 over a predetermined angle range as shown in FIG.

When the stop operation and the cassette eject operation are performed, the operation returns to the state shown in FIG. 6 by the operation opposite to the above.

As described above, the guide rail structure of the present invention has the drum base 10 and the left and right guide grooves 1 as shown in FIGS.
Drum base body 11 having 2, 13 and each guide portion 22, 32
It has a separate structure with both left and right guide rails 21 and 31, and these drum base body 11 and both guide rails
Since 21,31 are directly attached to the lower fixed drum 6, a space between the chassis 1 and the lower side of the drum 2 can be secured, and a loading ring 61, both slide plates 71, 81, and a link gear 76 are included in this space. Mechanism 60
By arranging, the pole bases 42 and 52 of both loading members 41 and 51 and the loading mechanism 60 can be connected.

Therefore, a camera-integrated VTR or the like can be made more compact.

Further, it becomes unnecessary to increase the diameter of the inner circumference of the loading ring due to the fact that it cannot be arranged below the drum and to form the guide hole of the chassis by disposing the loading ring below the chassis as in the conventional case.

Therefore, the diameter of the inner circumference is reduced so that the strength of the loading ring 61 can be sufficiently secured and the strength of the chassis 1 can be sufficiently secured.

Although the outer guide rail 25 on the tape supply side is provided in the embodiment, like the guide rail 31 on the tape winding side,
The outer guide rail 25 can be eliminated by thickening the guide portion 22 of the guide rail 21 on the tape supply side and fitting the pole base 42 therein.

As described above, according to the present invention, in the magnetic recording / reproducing apparatus in which the pair of loading members for winding the tape pulled out from the cassette around the drum are moved along the guide rails, the drum base is separated. Since the guide rails formed by the conversion are directly attached to the lower fixed drum, it is possible to arrange the loading mechanism such as the loading ring by utilizing the space between the chassis below the drum and thus downsizing. This can be achieved, and the strength of the chassis can be sufficiently obtained because the loading ring and the guide hole are not required due to the reduction of the inner diameter.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part showing the connection between a drum and a guide rail according to the present invention, FIG. 2 is an exploded perspective view of the drum and the guide rail, and FIGS. 3 and 4 are respective loading members and guide rails. Fig. 5 is a perspective view of a main part showing the loading mechanism, Fig. 6 is a plan view of the main mechanism part showing the unloaded state of the tape, and Fig. 7 is the unloaded position and loading completion. 6 is a plan view similar to FIG. 6 showing an operating state between the position and position, FIG. 8 is a plan view similarly showing a loading completed state, and FIG. 9 is a schematic plan view of a recording / playback state showing a tape path as an example. is there. 1 ... Chassis, 2 ... Drum, 4 ... Upper drum, 5
...... Rotary magnetic (video) head, 6 ...... Lower fixed drum, 10 ...... Drum base, 11 ...... Drum base body, 1
2,13 …… Guide groove, 21,31 …… Drum side fixed guide rail, 22,32 …… Guide part, 41,51 …… Loading member,
42,52 …… Pole base, 43,53 …… Guide rollers, 44,5
4 …… Inclined pole, 49,59 …… Coupling plate, 60 …… Loading mechanism, 61 …… Loading ring, 66 …… Middle gear, 71 …… Tape supply side slide plate, 76 ……
The same link gear, 81 …… Slide plate on the tape winding side, 100 …… Tape cassette, 101 …… Magnetic tape.

Claims (1)

[Scope of utility model registration request] 1. A magnetic tape is pulled out from a cassette by a pair of loading members that move along guide rails, respectively, and the tape is wound around a drum having a rotary magnetic head over a predetermined angle range. The drum is a lower fixed drum. In a magnetic recording / reproducing apparatus mounted on a chassis via a drum base, the drum base is separated to form the guide rail, and the guide rail is directly mounted on the lower fixed drum. Magnetic recording / reproducing device.