JPH02260193A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve assembling ability by integrally forming a rotary head drum and the supporting frame of a capstan motor, etc., and allowing the frame where the rotary head drum and a capstan have been already attached to be freely fixed to a mechanism chassis. CONSTITUTION:The chassis 10 is formed of resin and radial frames 12-14 are provided in the frame 11. Guide rails 15 and 16 are formed on both sides of the frame 12 and bosses 17 and 18 are formed in the center thereof. Bosses 19-24 are formed on the frame 13 at specified intervals, and shafts 25 and 26 are protrusively formed in the center of the frame 14 and a boss 27 is formed on right end thereof. A pin 28 is protrusively formed on the upper part of the frame 11. Then, hook type pawls 17a-24a, 27a and 29a are integrally formed on the upper parts of the bosses 17-24, 27 and 29 and an annular recessed locking part is integrally formed on the upper parts of the shafts 25 and 26. With such constitution, the conventional Al chassis 10 is made light in weight, the degree of freedom for forming is increased. The shaft to the chassis and the calking and the press-fitting of the boss are made needless, so that the imperfection of parts is prevented, the number of parts is reduced and the cost of the device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing apparatus such as a video tape recorder (VTR).

"Summary of the Invention" The present invention provides a magnetic recording/reproducing device in which a rotating head drum, etc. is attached to a mechanical chassis, in which a frame supporting the rotating head drum, a capstan motor, etc. is integrally molded, and the rotating head drum, etc. is mounted on a mechanical chassis. By making it possible to assemble the attached frame to the mechanical chassis, the tape path (tape running) system on the tape entrance/exit side of the rotating head drum can be made into a unit, greatly improving ease of assembly. , it is possible to manage, maintain, and guarantee the quality of the tape pass system at a constant high quality in total.

[Prior Art] For example, the rotary head drum, capstan motor, various tape guides, etc. of a conventional video tape recorder (VTR) are each attached as a single component to an aluminum mechanical chassis.

[Problems to be Solved by the Invention] However, in the conventional configuration described above, the quality of the tape path system at the entrance and exit of the tape around the rotating rad tram cannot be kept constant in total due to variations in precision in assembling each part. It was difficult to maintain and guarantee quality control.

SUMMARY OF THE INVENTION Therefore, the present invention provides a magnetic recording and reproducing device that can significantly improve the ease of assembling a tape path system, and also manage and maintain the overall quality of the tape path system at a constant high quality. It is.

[Means for solving the problem] A frame supporting the rotating head drum, capstan motor, etc. is integrally molded, and the frame to which the rotating head drum, capstan motor, etc. are attached can be freely assembled into a mechanical yarn. It is.

[Function] The frame supporting the rotary head drum, capstan motor, etc. is integrally molded, and the frame to which the rotary head drum, etc. is attached can be freely assembled to the mechanical rack, so that the tape on the entrance/exit side of the rotary head drum can be easily assembled. The pass system is made into a unit, which improves the ease of assembly into mechanical yarns.

As a result, the quality of the tape pass system is managed and guaranteed to be a constant high quality in total.

[Example] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 7, l is an 8 mm video tape recorder as a magnetic recording/reproducing device, and its appearance includes a housing 2, a holder 3 that also serves as a holder for holding a tape cassette 4, and a rope ink drive mechanism 71. Rotating head drum 8
．． The mechanical string 10 to which the capstan motor 9 and the like are assembled is molded from synthetic resin such as ABS resin.

As shown in FIG. 1, the mechanical chassis 10 is integrally molded from ABS resin into a rectangular frame shape, and extends radially within a rectangular outer frame portion I1, a middle frame portion 12, a lower frame portion 12, 13.14.

A pair of kite rail portions 15 and 16 are integrally molded on both left and right sides of the upper frame portion 12, and a first
．． The second boss portions 17 and 18 are integrally formed by extrusion molding. The middle frame part 13 is integrally formed with third to eighth boss parts 19 to 24 in order from the left side to the upper right side in FIG. 1 at a predetermined distance.

Furthermore, a pair of left and right shaft parts 25 and 26 are integrally formed in the center of the lower frame part 14, and a ninth boss part 27 is integrally formed in the right end side in FIG. . Furthermore, a pair of pin parts 2 are provided on the upper side of the outer frame part 11.
8.28 is integrally protruded, and a tenth boss portion 29 is integrally protruded from the center of the lower side thereof. In addition, a plurality of claw parts 17a, . It is. Furthermore, annular concave locking portions 252L and 26a are formed at the upper portions of the pair of shaft portions 25 and 26, respectively.

Then, the loading drive mechanism 7 is assembled to the lower frame portions 12, 13, and 14 of the mechanical shear 10, underground. This loading drive mechanism 7 includes a supply reel stand 3 rotatably supported by the one shaft portion 25.
0, a take-up reel stand 31 rotatably supported by the other shaft portion 26, and a drive gear 32 rotatably supported by the first O boss portion 29,
The gear 30 of the bipedal supply reel stand 30 is pivotally supported by a pin on the upper and lower surface side of an inverted letter-shaped support arm 33 that swings in the left-right direction around the first O boss portion 29 on the drive gear 32.
an oscillating gear 34 that meshes with either the gear 31a of the take-up reel stand 31 and rotates either one of the reel stands 30.3+, and is rotatably supported on the eighth boss portion 24. and an intermediate gear 9 meshing with a gear 97 of a capstan 91 which will be described later of the capstan motor 9.
a first gear 35 that is rotatably supported by the seventh boss portion 23 and that meshes with the large diameter gear portion 35b of the first gear 35;
and a third gear which is rotatably supported by the sixth boss part 22, has three small-diameter planetary gears 37 in a row inside, and whose large-diameter gear part 38a meshes with the second gear 36. 38, a fourth gear 39 which is rotatably supported by the fifth boss part 21 and meshes with the small diameter gear part 38b of the third gear 38, and a fourth gear 39 which is rotatably supported by the first boss part 17. The first loading gear 40 is rotatably supported by the second post 18 and meshes with the first loading gear 40, and the small diameter gear portion 41b meshes with the fourth gear 39. The second loading gear 41 is pivotally supported by a pin at the other end of a two-section link 42 whose one end is pin-engaged with an engagement groove 40a formed in an arc shape in a portion of the first loading gear 40. , a first slide base 43 that slides along the elongated hole 15a of one guide rail portion 15 of the mechanical gear IO, and an engagement groove 41a formed in an arc shape in the upper part of the second loading gear 41. A two-bar link 4 with one end pin-engaged with the
The mechanical yarn 1 is pivotally supported by a pin on the other end of the mechanical yarn 1.
0 and a second slide base 47 that slides along the elongated hole 16a of one of the guide rail portions 16.

A pair of left and right brake gears 50 and 51 are pivotally supported by pins on both sides of the support arm 33, which swings the oscillating gear 34, across the drive gear 32, respectively. As shown in FIG. 9, the pair of brake gears 50.
When the brake gear 50 is engaged with the gear 302L of the supply reel stand 30 and brakes the supply reel stand 30 side, the other brake gear 51 is separated from the gear 31a of the take-up reel stand 31. When the oscillating gear 34 meshes with the gear 30a of the supply reel stand 30, the other brake gear 51 releases the brake on the take-up reel stand 31, as shown in FIG. The one brake gear 50 meshes with the gear 31a of the stand 31 to brake the take-up reel stand 31 side, while the one brake gear 50 separates from the gear 30a of the supply reel stand 30 to release the brake on the supply reel stand 30 side. It has become.

Further, a pulley 32a integrally molded on the lower part of the drive gear 32, a pulley 36a integrally molded on the upper part of the second gear 36, and a base rotatably supported by the ninth boss 27 are provided. Between the belt tension pulleys 53 which are pivotally supported by a pin at the tip of the swing arm 52 which is cylindrical,
A timing belt 55 is stretched so as to substantially surround the take-up reel stand 31. Thereby, the pair of reel stands 3031 and each pair of loading gears 40, 41 are rotated by the capstan motor 9 as one driving source.

Incidentally, as shown in FIG. 5, the first. Second boss part 1
7. The pair of loading gears 40.41 rotatably supported by Ni-Nuki has been stopped. Furthermore, each gear 39.38, 36.35 rotatably supported by the fifth to eighth boss parts 21 to 24 is also
24 claws 21a to 24a similarly allow easy insertion and securely prevent removal. Furthermore, each reel stand 30, 31 rotatably supported by each shaft part 25, 26 also has a respective locking part 25a.

26a reliably prevents removal. In addition, the above-mentioned No. 9. Support arm 33. which is rotatably supported by the tenth boss portion 27.29. The swing arm 52 also has each boss portion 27.
Similarly, it can be easily inserted by the claw portions 27a and 28a of 29, and is securely prevented from being removed.

Also, on the pair of slide bases 4347 are vertical tape guides 44, 4.8 and inclined tape guides 45.
49 were erected.

As shown in FIGS. 1, 3, etc., the rotary head drum 8, capstan motor 9, etc. are unitized by an integrally molded frame 60. Specifically, this frame 60 includes a circular frame-shaped drum support part 61 to which the rotating head drum 8 is attached, and this drum support part 61.
one guide rail section 62 located on the left side in FIG. 1 around the drum support section 62 connected to one guide rail section 15 of the mechanical chassis 10, and on the right side in FIG. 1 around the drum support section 61. Located above Mechanical Sharn 1
The other guide rail part 63 is connected to the other guide rail part 16 of 0, and the motor pedestal part 64 is attached to this guide rail part 63 and to which the capstan motor 9 is attached, and these parts are integrally made of aluminum. It is molded.

A pair of pin portions 2 of the mechanical chassis 10 are provided on the upper side of the drum support portion 61 of the frame 60 in FIG.
A pair of mounting positioning holes 61a for inserting 8.28 to position and assemble the frame 60 to the mechanical chassis IO.

61a, and a mounting hole 61b is formed at the opposite position. Also, around the drum support part 61 there are mounting holes 6 for mounting the rotary head drum 8.
1c is formed at three locations.

A curved long groove 62a in which the first slide base 43 is guided and slides is formed in the center of one guide rail portion 62 of the frame 60. On the entrance side, there is a flange 6 that regulates the tape height of the running magnetic tape T.
A tape guide 65 having a tape guide 5a is installed vertically. Also,
A curved long groove 63a is formed in the center of the other guide rail portion 63 of the frame 60, in which the second slide base 47 is guided and slid.

Further, the motor pedestal portion 64 of the frame 60 has a pair of screw holes 64a, 64 through which the capstan housing 90 of the capstan motor 9 is attached via each screw 66.
It forms a. In the center of the capstan housing 90 of the capstan motor 9, there is a capstan 91.
is rotatably supported via a pair of bearings 92 and 92.

A stator 94 having multiple phase drive coils 93 of the capstan motor 9 is screwed to the upper part 90a of the capstan housing 90.

A rotor 96 made of a rotor magnet 95 or the like is fixed to two ends of the capstan 91 that protrudes upward from the stator 94 at a predetermined clearance from the stator 94. Further, a gear 97 is fixed to the lower end of the capstan 91.

This gear 97 meshes with an intermediate gear 99 rotatably supported via a support shaft 98 protruding from the lower surface of the lower part 90b of the capstan housing 90.

Furthermore, a pinch roller 70 is pressed into contact with the center of the capstan 9I. The pinch roller 70 is rotatably supported by a column 71 erected on two sides of the lower part 90b of the capstan housing 90, and is supported by an arm 73 biased toward the capstan 91 by a torsion coil spring 72. It is rotatably supported via a rotation shaft 74.

According to the 8mm video tape recorder 1 of the above embodiment,
The mechanical chassis 10, including the boss portion 17, shaft portions 25, 26, and pin portions 28, is integrally molded from synthetic resin, so-called full molding, so it is different from the conventional aluminum J.
It is possible to significantly reduce the weight compared to the one made from one piece, increase the degree of freedom in shaping the shape, and improve productivity. Also, crimping shafts, bosses, etc. to mechanical chassis as in the past.

Since press-fitting, etc. is not required, the number of parts and accessories such as washers attached to these parts can be reduced, and costs can be significantly reduced, and the loading drive mechanism 7, etc. Assembling to a mechanical yarn 10 can further facilitate workability.

In addition, since the mechanical cable IO is made of synthetic resin, the vibration absorption coefficient (Q value) can be lowered compared to the conventional one made of aluminum. Value is 140-1
50, the Q value of the mechanical chassis 10 made of ABS resin is 30 to 35).

As a result, the conventional aluminum mechanical
When comparing the vibration characteristics of the chassis and the mechanical chassis IO made of ABS resin of the present invention, as shown in the graph of the experimental results in FIG. It was found that the damping characteristics are better, that is, the absorption characteristics against disturbances are better (the resonant damping effect is greater than that of the tape path system). In addition, the 8th
In the graph shown in the figure, ■ indicates the vibration damping of the conventional aluminum mechanical chassis 10, and ■ indicates the vibration damping of the ABS resin mechanical chassis 10 of the present invention.

In addition, the rotating head drum 8. Capstan motor9. A frame 60 supporting the tape guide 65 is integrally molded from aluminum, and a rotating head drum 8 is attached to this frame 60.
By assembling them in advance based on the same standards, it is possible to unitize the tape path (tape running) system on the entrance/exit side of the rotary head drum 8, and also to
The tape path can be stabilized by integrated management of precision parts such as, and the quality of the tape path system can be managed, maintained, and guaranteed at a constant high quality in total. Further, a rotating head drum 8. Capstan motor9. tape guide 6
5 is mounted on the frame 60, the mounting standard or reference surface is simplified, and the tape path adjustment range is reduced.
Furthermore, it is also possible to eliminate the adjustment mechanism (tllil adjustment work), and the management and assemblability of the tape path system described above can be further improved. This makes it possible to use the tape running unit as an OEM and to add high value. Note that the rotor 96 of the capstan motor 9
Since the side is above the stator 94, when attaching the capstan motor 9 to the frame 60, and when attaching the unitized frame 60 to the mechanical chassis 10,
When assembling the product, it is possible to perform one assembly from one direction (from the top to the bottom), which significantly improves work efficiency and saves installation space.

Furthermore, one drive edge of the capstan motor 9 allows
Swing gear 34. third gear 38 with planetary gear 37
The pair of reel stands 30.degree. 31 and the pair of loading gears 40, 41 can be rotated through the screws, etc., and the loading drive mechanism 7 and the like can be simplified.

Then, when rewinding the magnetic tape T of the tape cassette 4 mounted on the pair of reel stands 30 and 31 onto the supply reel 5, as in the case of reverse (REV), the gear 97 of the capstan 91, etc. Through the timing belt 55
Rotate the oscillating gear 34 in the direction of the arrow in Figure 1O.
When switching to the meshing of the gear 30a of the supply reel stand 30,
In conjunction with this switching, the brake gear 5I, which swings in the opposite direction to the oscillating gear 34, is connected to the gear 3 of the take-up reel stand 31.
1a to apply appropriate braking to the take-up reel stand 31. Thereby, idle rotation of the take-up reel stand 31 can be suppressed when the magnetic tape T is reversed, and more magnetic tape T than necessary is not pulled out from the take-up reel 6 to the supply reel 5 side. At this time, one brake gear 50 is separated from the gear 302L of the supply reel stand 30, and the braking on the supply reel stand 30 side is released.

Further, during recording, reproduction, etc., as shown in FIG.
a to prevent more magnetic tape T than necessary from being drawn out from the supply reel 5 to the take-up reel 6.

FIG. 11 shows another embodiment. The capstan motor 9' assembled to the mechanical shear IO of this embodiment has a rotor 96 provided below the stator 94, and a capstan 91 protruding in one direction (the other configuration is the same as in the above embodiment). Therefore, the same reference numerals are given and the explanation is omitted), and substantially the same operation and effect as the above embodiment is achieved.

Although the above embodiments have been described with respect to an 8 mm video tape recorder, the present invention is not limited to this and can of course be applied to various magnetic recording and reproducing devices such as video tape recorders other than 8 mm and camera-integrated video devices. It is.

[Effect of the invention 1 As described above, according to the present invention, a frame supporting a rotating head drum, a capstan motor, etc. is integrally molded, and the frame to which the rotating head drum, etc. is attached is assembled to a mechanical shear. Since it is made flexible, the tape path system on the tape inlet/outlet side of the rotary head drum can be made into a unit. Therefore, the assemblability of the tape pass system can be greatly improved, and the quality of the tape pass system can be managed, maintained, and guaranteed at a constant high quality in total.

[Brief explanation of drawings]

Fig. 1 is an exploded plan view of the main parts of a VTR showing an embodiment of the present invention, Fig. 2 is a sectional view of the mechanical unit, Fig. 3 is a perspective view of the unitized rotating head drum, etc., and Fig. 4 is A plan view of the mechanical chassis with the loading drive mechanism etc. installed, Fig. 5 is a sectional view of the mechanical chassis, Fig. 6 is a sectional view of the mechanical chassis near the reel stand, and Fig. 7 is the entire VTR. FIG. 8 is a graph comparing vibration characteristics. FIG. 9 is a schematic explanatory diagram of the reel stand drive system during playback. FIG. 10 is a schematic explanatory diagram of the reel stand drive system during reverse. The figure is a sectional view of a main part of another embodiment. ■...8mm VTR (magnetic recording and reproducing device), 8-rotation head drum, 99' capsunmo 10, mechanical chassis, 60 frame days p nibi 1, k

Claims (1)

[Claims] (1) A magnetic device characterized in that a frame supporting a rotating head drum, a capstan motor, etc. is integrally molded, and the frame to which the rotating head drum, capstan motor, etc. are attached can be freely assembled to a mechanical chassis. Recording and playback device.