JP2658588B2 - Magnetic recording / reproducing 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 helical scan type magnetic recording / reproducing apparatus (hereinafter referred to as "VTR"), and more particularly to a tape guide apparatus which is advantageous for downsizing a VTR.

[0002]

2. Description of the Related Art FIG. 7 is a schematic view showing an example of a tape running system of a conventional VTR, showing only a tape and members for guiding the tape. In the figure, a tape 2 pulled out from a supply side reel 1 is wound around rollers 4 and 5 in a cassette 3, tension is controlled by a tension pole 6, guided by a slant pole 7 and an inclined impedance roller 8, and the tape is pulled out. Guide post 9 for member 9
a, 9b, and is guided by guide posts 11a, 11b of a tape pull-out member 11 and a thrust pole 12, so that the movable guide post 1
Wrap around 3. The height of the tape changes from the slant pole 7 to the thrust pole 12 across the drum 10. The tape 2 that has exited the movable guide post 13 is wound around an A / C head 14 and is wound around a pinch roller 15 at an angle θ. The tape 2 that has exited the pinch roller 15 is wound around rollers 16 and 17 in the cassette 3, and the take-up reel 1
8 In the figure, reference numeral 19 denotes a capstan.

Next, the operation will be described. A constant back tension is applied to the tape 2 supplied from the supply reel 1 of the cassette 3 by the tension pole 6. Then, the tape 2 is wound around various guide posts on which the tape 2 runs, thereby increasing the tension of the tape 2. At the entrance of the capstan 19, the tension is several times or more than the tension emitted from the supply reel 1. The tape 2 is pressed by the capstan 19 and the pinch roller 15, and the tape 2 is driven by the frictional force.

[0004]

Since the conventional VTR is constructed as described above, the tape 2 is largely wound around the pinch roller 15 at the entrance of the capstan 19 as shown in FIG. As described above, when the tape 2 is wound around the pinch roller 15 generally made of rubber, the speed of the tape 2 is likely to be delayed with respect to the rotation of the capstan 19. A crimping force is required. If the tape is wrapped around the pinch roller 15 first, the tape speed tends to be uneven due to elastic deformation of the rubber or the like, which may cause wow and flutter.
In order to solve these problems, it is possible to arrange a member for guiding the tape 2 in a common tangential direction between the capstan 19 and the pinch roller 15, but on the operation path of the movable tape guides 9, 11, 13 it is possible. Therefore, it is necessary to expand the respective arrangements, and there is a problem that it is difficult to reduce the size of the apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can be designed to be compact as a whole, and it is possible to almost eliminate the winding of the tape around the pinch roller at the entrance side of the capstan. The purpose is to obtain a VTR that can reduce the running load of the tape, eliminate the delay due to the slip of the tape, and further reduce the pressure force of the pinch roller and reduce the load on the capstan motor. And

[0006]

A VTR according to the present invention
The tape guide member at the capstan entrance is made movable, and after the member for loading the tape has passed, it rotates and abuts on the tape to guide the tape,
The movement of the tape guide member is kicked out by an arm for driving a pinch roller.

[0007]

According to the VTR of the present invention, the distance between the A / C head and the capstan can be reduced by providing a movable tape guide member between the A / C head and the capstan, and the entire deck can be made compact. Can be summarized. Also becomes directly less susceptible structure deformation of the arm due to crimping operation timing to accurate and pinch roller capstan for movement in conjunction with the arm for driving the pinch rollers, stable tape running is obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic diagram showing a state after loading is completed, FIG. 2 is a schematic diagram showing a state before loading, and FIG.
2 is an enlarged view of a main part of FIG. 2, FIG. 4 is the same view as FIG. 3 showing a state in the middle of loading, FIG. 5 is an enlarged view of a main part of FIG. 1, and FIG. 6 is a view of FIG. The same or corresponding parts as those described above are denoted by the same reference numerals and description thereof is omitted.

In FIG. 1, reference numeral 20 denotes a movable tape guide post disposed between the A / C head 14 and the capstan 19; and 21, a guide post drive which supports the movable guide post 13 and is rotatably mounted on a shaft 22. arm,
23 guide post driving arm 21 partially provided with a cam 21a into contact with the pinch roller driving ah <br/> arm to be moved in, 24 a shaft for rotatably supporting the pinch roller driving arm 23, 25 is a pinch The pinch roller 15 is attached by a shaft attached to the roller drive arm 23. 26 is a shaft 2 attached to a holder 27
The sleeve is rotatably mounted on 8, and the pinch is 29
The roller guide arm 23 is a member that moves in contact with a member 23a attached thereto.
And press fit. Numeral 30 denotes a torsion coil spring disposed between the holder 27 and the tape guide post 20 so that the member 29 comes into contact with the member 23a, and 31 denotes the A / C head 1
4 base.

Next, the loading operation will be described. 2 and 3, the guide post driving arm 21 on which the movable guide post 13 is mounted is rotated while the tape 2 is rotated.
The tape 2 is guided by the tape guide post 20 and the sleeve 26 from the middle as shown in FIG. When the loading further proceeds, the cam 21a of the guide post driving arm 21 pushes the pin 23b to pinch the arm.
As the roller drive arm 23 rotates, the tape guide post 20 is ejected by the member 23a, and is rotated to the loading completed position as shown in FIGS.

[0011] FIG. 1, the variable from the loading position shown in FIG. 5
Guide post drive arm 2 with moving guide post 13
When 1 rotates in the opposite direction, the torsion coil spring 3
0 moth pinch roller drive arm 23 due restoring force of
4 together with the id post drive arm 21 from FIG.
Returning to FIG. 3, finally returns to the state before loading shown in FIGS. The driving configuration of the movable guide post 13 is the same as that of the conventional device, and the description thereof is omitted.

[0012]

As described above, according to the present invention, the entire structure can be made compact by making the tape guide member movable, and a space can be secured, and a roller having a small tape running load can be used. And the load on the capstan motor can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which loading is completed in a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a state before loading.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is the same view as FIG. 3 showing a state during loading.

FIG. 5 is an enlarged view of a main part of FIG. 1;

FIG. 6 is a view of FIG. 3 as viewed from above.

FIG. 7 is a schematic diagram of a tape running system of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 2 tape 3 cassette 9,11 tape pull-out member 10 drum 13 movable guide post 14 A / C head 15 pinch roller 19 capstan 20 tape guide member 21,23 arm

Claims (1)

(57) [Claims] 1. A magnetic recording reproducing apparatus for drum recording and mounted on the helical tape to which a magnetic head, the lead to the movable guide post from the tape cassette
Guide post drive arm that holds and drives, this guide
Pinch roller driven in conjunction with post drive arm
Pinch roller drive arm for holding the slewing arm and holder
To the pinch roller drive arm.
A member which is urged and turned in a direction to be engaged with the arm, and
The member is rotatably mounted on the free end side of the member, and A /
Tape guide located between C head and capstan
A magnetic recording / reproducing device comprising a post .