JPH06251465A - Chassis of magnetic recording and reproducing device and method for adjusting bending of chassis - Google Patents

Abstract

PURPOSE:To improve the stability of tape traveling without providing fresh constituting parts, such as adjusting screws, by bending and deforming the level difference parts on both sides of guide groove holes, etc., of the chassis, thereby adjusting the inclination accuracy of tape guides after completion of loading. CONSTITUTION:A pair of guide groove holes 3, 3' are formed around a drum 8 of the chassis 1. The tape 22 is drawn out around the drum 8 of the chassis 1 from a tape cassette 20 via respective sliders 10, 10' along the respective guide holes 3, 3' of the chassis 1 to make the tape guides 11, 12 freely movable back and forth. Respective bend adjusting holes 5, 5' are formed near these guide holes 3, 3'. As a result, the chassis 1 is bent and deformed and the inclination angles of the tape guides 11, 12' are adjusted by inserting adjusting jigs into the guide adjusting holes 5, 5'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chassis of a magnetic recording / reproducing apparatus such as a VTR (video tape recorder) and a method for adjusting the bending of the chassis.

[0002]

2. Description of the Related Art For example, in a VTR, it is necessary to wind a magnetic tape around a rotary head drum of a helical scan system, which is rotatably supported on a chassis, at a predetermined angle and to stably run the tape with an accuracy of micron order. . Also, in order to pull out and rewind (load / unload) the magnetic tape from the tape cassette around the rotary head drum, the tape guide is slid along the guide groove hole formed around the rotary head drum of the chassis. It is reciprocally movable via the.

[0003]

However, in recent years, since the magnetic tape in the tape cassette has become thin with the lapse of time, when the tape running becomes unstable,
There is a growing risk of damaging the magnetic tape.
Therefore, it is necessary to improve the inclination accuracy of the tape guide, and increase the accuracy of each individual item such as the chassis and the slider on which the tape guide is attached and the stopper that receives the slider, and newly provide components such as adjusting screws. However, it takes a lot of time to select parts,
There was a drawback that the whole structure became complicated.

Therefore, according to the present invention, the inclination angle of the tape guide can be easily adjusted without increasing the number of new components such as adjusting screws, and without increasing the precision of the components, and further, the selection of components can be performed. A chassis of a magnetic recording / reproducing apparatus and a method for adjusting the bending of the chassis, which can reduce labor.

[0005]

A tape guide hole is formed around a rotary head drum, and a tape guide is pulled back and forth around the rotary head drum from a tape cassette through a slider along the guide groove hole. A bending adjustment hole is formed in the vicinity of the guide groove hole in the movable chassis of the magnetic recording / reproducing apparatus.

A guide slot is formed around the rotary head drum, and a tape guide for drawing the tape from the tape cassette around the rotary head drum is reciprocally movable along the guide slot through a slider. In the method for adjusting the chassis bending of the magnetic recording / reproducing apparatus, the adjustment jig is inserted into the guide groove hole, or the adjustment jig is inserted into the bending adjustment hole formed in the vicinity of the guide groove to move the chassis. The tape guide is bent and deformed to adjust the inclination angle of the tape guide.

[0007]

The adjusting jig is inserted into the guide groove hole of the chassis or the bending adjusting hole near the guide groove hole to bend and deform the step portion near each hole of the chassis to adjust the inclination angle of the tape guide. As a result, the inclination accuracy of the tape guide after the loading is completed can be easily and quickly secured to the reference value, the component accuracy can be relaxed, and the time and effort required for component selection can be reduced. As a result, there is no need to provide a new component such as an adjusting screw as in the conventional case, the number of components is reduced, and the cost is further reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 is a chassis used for an 8 mm VTR (magnetic recording / reproducing apparatus). The chassis 1 is formed of a metal plate into a substantially square shape. A drum mounting opening 2 is formed substantially above the center of the chassis 1, and a pair of guide groove holes 3, 3 ′ extending around the drum mounting opening 2 to the center of the chassis 1 are formed. Also, a pair of guide groove holes 3, 3'of the chassis 1
A pair of bending adjusting holes 5 and 5'are formed near the stoppers 4 and 4'fixed to the upper end side in FIG.
On the lower side of the chassis 1, there are formed a pair of shaft mounting holes 7 and 7'for mounting respective shafts (not shown) of the supply reel base 6 and the take-up reel base 6 '.

Three mounting holes 2a, 2b, 2c are formed near the drum mounting opening 2 of the chassis 1. A rotary head drum 8 of a helical scan type is attached to each of the attachment holes 2a, 2b, 2c via an attachment base (not shown). This rotary head drum 8 is a fixed lower drum 8
a and a magnetic head (not shown) are attached and fixed to the lower drum 8a.
It is composed of a rotating upper drum 8b that rotates with respect to.

The pair of guide groove holes 3 and 3'are formed in a substantially V-shape, and the sliders 10 and 10 'are respectively inserted into the guide groove holes 3 and 3'through the pins 9 to provide a loading drive mechanism (not shown). It is arranged so that it can slide back and forth.
As shown in FIGS. 1 and 2, an inclined fixed type tape guide 11 and a vertical rotation type tape guide 12 are erected on the sliders 10 and 10 ', respectively. In addition, each slider 1
The upper surface of the tip side protruding portion of 0, 10 'is the tilt receiving portion 10a.
Thus, the lower step portions 4a of the respective stoppers 4 and 4'are brought into contact with and pressed against the lower surfaces. Further, as shown in FIGS. 1 and 3, a pair of azimuth receiving portions 10b and 10c are integrally formed on both lower sides of the bottom surfaces of the sliders 10 and 10 'so as to project therefrom.

The pair of bending adjusting holes 5 and 5'are formed to have substantially the same width as that of the pair of guide groove holes 3 and 3 ', and one bending adjusting hole 5 is located near the guide groove hole 3 in the figure. On the upper left side, the other bending adjusting hole 5'is formed in a short length by being arranged on the upper side in the drawing between the guide groove hole 3'and the drum mounting opening 2. An azimuth adjusting jig rod (adjusting jig) 30 shown in FIG. 4 can be inserted into the bending adjusting holes 5 and 5'and the guide groove holes 3 and 3 '. A pair of notches 31a, 31a facing each other are formed on the tip portion 31 of the azimuth adjusting jig rod 30. The tip portion 31 of the azimuth adjusting jig rod 30 is inserted into each of the guide groove holes 3 and 3'or each of the bending adjusting holes 5 and 5 ', and one notch portion 31a is engaged with the edge portion of each hole of the chassis 1. Azimuth adjustment jig rod 30
Chassis 1 by swinging back and forth, left and right
The step portion near each hole can be bent and deformed.

In FIG. 1, 13 is a capstan, 14 is a pinch roller, 15 and 16 are tape guides, and 17 is a tape guide of a tension regulator. Also, 20
Is a tape cassette, 20a is an opening of the tape cassette,
Reference numeral 21 is a supply reel, 21 'is a take-up reel, and 22 is a magnetic tape. In this VTR, the magnetic tape 22 in the opening 20a of the tape cassette 20 is pulled out by the tape guides 11 and 12 on the pair of sliders 10 and 10 ', and the sliders 10 and 10' are connected to the stoppers 4 and 4, respectively.
When it comes into contact with 4'and stops (this state is called a loading completed state), it is wound around the outer peripheral surface of the rotary head drum 8 at a predetermined angle. The magnetic tape 22 thus loaded is sandwiched between the capstan 13 and the pinch roller 14 and runs in a predetermined direction at a constant speed.

According to the chassis 1 of the VTR of the above embodiment, the tilt of the pair of sliders 10, 10 'sliding along the pair of guide groove holes 3, 3'of the chassis 1 in the azimuth direction (x direction) is prevented. It is determined by the step (concavo-convex) portion of the chassis 1 on the left and right sides of each guide groove 3, 3'of the chassis 1 for receiving the pair of azimuth receiving portions 10b, 10c on the bottom surface of the pair of sliders 10, 10 '. Insert the tip 31 of the azimuth adjusting jig rod 30 into the guide groove holes 3, 3'at the step portions on the left and right sides of the guide groove holes 3, 3'of the chassis 1 near the stoppers 4, 4 '. Adjustment is performed by bending and deforming the step portion near each hole of the chassis 1 while looking at an inclination adjusting jig (not shown). This allows
It is possible to easily and reliably adjust the inclination of each slider 10, 10 'in the azimuth direction (x direction), that is, the inclination angle of each tape guide 11, 12 in the loading completed state.

When adjusting the tilt of the sliders 10 and 10 'in the azimuth direction, the drum mounting surface of the chassis 1 including the mounting holes 2a, 2b and 2c near the drum mounting opening 2 is deformed. If there is a risk of causing the above, the tip end portion 31 of the azimuth adjusting jig rod 30 should be inserted into the bending adjusting holes 5 and 5 ′ formed in parallel with the guide groove holes 3 and 3 ′. Similarly to the above, the step portion near the hole of the chassis 1 is bent and deformed to adjust the tilt of the sliders 10 and 10 'in the azimuth direction. As a result, the inclination angles of the tape guides 11 and 12 in the loading completion state can be easily and reliably adjusted without changing the mounting accuracy of the rotary head drum 8.

In this way, the inclination accuracy of the tape guides 11 and 12 for pulling the magnetic tape 22 out of the tape cassette 20 and loading it around the rotary head drum 8 after the completion of loading is determined by the guide groove holes 3 of the chassis 1. 3'or the azimuth adjusting jig rod 30 is inserted into the bending adjusting holes 5 and 5'in the vicinity of the guide groove holes 3 and 3'to bend and deform the left and right steps of the chassis 1 in the vicinity of the holes. Since it is driven in by adjusting with, it is possible to loosen the precision of the parts of the chassis 1, the stoppers 4 and 4 ', the sliders 10 and 10', the tape guides 11 and 12, and the like.
It is possible to reduce the trouble of selecting parts. As a result, it is no longer necessary to provide a new component such as an adjusting screw as in the conventional case, the number of parts is reduced, and the VT with high accuracy can be manufactured at low cost.
R can be provided.

Further, it is not necessary to secure the required accuracy after assembling by accumulating the accuracy of the individual products, and it is possible to avoid the assembling failure due to lack of skill. Further, the rotary head drum 8 and the sliders 10, 1 are mounted on the chassis 1.
After assembling each component such as 0 ', necessary accuracy such as inclination accuracy of each tape guide 11 and 12 after completion of loading can be easily adjusted to the reference value in a short time. As a result, the stability of the tape running of the magnetic tape 22 loaded around the rotary head drum 8 can be improved, and the tape damage and the like during tape running can be reduced.

Although the 8 mm VTR chassis and the method for adjusting the bending of the chassis have been described in the above embodiment, the magnetic recording / reproducing apparatus is not limited to the 8 mm VTR, and various magnetic devices such as a digital VTR. It can be applied to a chassis used in a recording / reproducing apparatus.

[0019]

As described above, according to the present invention, the guide groove hole is formed around the rotary head drum, and the tape is removed from the tape cassette through the slider along the guide groove hole of the rotary head drum. In the chassis of the magnetic recording / reproducing device in which the tape guide pulled out around is made reciprocally movable, the bending adjustment hole is formed in the vicinity of the guide groove hole, so it can be adjusted by the simple structure of forming the bending adjustment hole in the chassis. It is possible to easily and surely adjust the inclination angle of the tape guide without increasing new components such as screws. Further, the inclination accuracy of the tape guide can be increased at low cost without increasing the accuracy of the parts or selecting the parts.

A guide groove is formed around the rotary head drum, and a tape guide for drawing the tape from the tape cassette around the rotary head drum is reciprocally movable along the guide groove through a slider. In the method for adjusting the chassis bending of the magnetic recording / reproducing apparatus, the adjustment jig is inserted into the guide groove hole, or the adjustment jig is inserted into the bending adjustment hole formed in the vicinity of the guide groove to move the chassis. Since the tape guides are bent and deformed to adjust the inclination angle of the tape guide, the inclination accuracy of the tape guide can be easily maintained at the reference value by the adjustment work in a short time. Also, since the chassis can be bent and deformed to cover even if the precision of the parts is loosened, it is possible to reduce the trouble of selecting parts and eliminate the need to provide new components such as adjustment screws as in the conventional case. It is possible to adjust the inclination angle of the tape guide at low cost without increasing the accuracy of the process and selecting the parts.

[Brief description of drawings]

FIG. 1 is an overall plan view of a VTR chassis showing an embodiment of the present invention.

FIG. 2 is an explanatory plan view showing a relationship between a slider and a stopper used in the chassis.

FIG. 3 is a bottom view of the stopper.

FIG. 4 is an explanatory diagram of an adjustment jig used for adjusting the bending of the chassis.

[Explanation of symbols]

 1 ... Chassis 3, 3 '... Guide groove hole 5, 5' ... Bending adjustment hole 8 ... Rotating head drum 10, 10 '... Slider 11, 12 ... Tape guide 20 ... Tape guide 22 ... Tape 30 ... Adjustment jig

Claims (2)

[Claims] 1. A guide groove hole is formed around a rotary head drum, and a tape guide for drawing a tape from a tape cassette around the rotary head drum is reciprocally movable along the guide groove hole via a slider. In the chassis of the magnetic recording / reproducing apparatus, a bending adjusting hole is formed near the guide groove hole. 2. A guide groove hole is formed around the rotary head drum, and a tape guide for drawing the tape from the tape cassette around the rotary head drum is reciprocally movable along the guide groove hole via a slider. In the method for adjusting the chassis bending of the magnetic recording / reproducing apparatus, the adjustment jig is inserted into the guide groove hole, or the adjustment jig is inserted into the bending adjustment hole formed in the vicinity of the guide groove to move the chassis. A bending adjustment method for a chassis of a magnetic recording / reproducing apparatus, which comprises bending and deforming to adjust an inclination angle of the tape guide.