JP2633985B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a helical scan type magnetic recording / reproducing apparatus, and relates to a small, lightweight, and high-performance mechanism.

[Prior art] One of the means for reducing the size of a running mechanism such as a home movie or a DAT is to form a predetermined tape running path from a first cassette position on a subchassis on which a cassette tape is mounted. In addition, there is a method of achieving a compact mechanism by moving the cassette opening to a second cassette position overlapping with the drum.

As described in JP-A-1-162267 and JP-A-1-300461, the upper surface of the sub-chassis has a reel base engaged with a reel hub housed in a cassette, and a rotational force of a capstan motor. Operating mechanism members such as a swing idler for transmitting the rotation of the reel base, a tension device, a brake for controlling the rotation of the reel base, and the like.

[Problem to be Solved by the Invention] In the above-described conventional component arrangement, a reel base is particularly arranged on the cassette mounting surface of the sub-chassis, and a braking member for locking the rotation of the reel base is provided on the sub-chassis cassette mounting surface. Had been placed. On the other hand, since the operating member is mounted on the main chassis, the braking member on the sub-chassis must be driven through the notch hole of the sub-chassis. In the loading method in which the drum and the cassette opening overlap, the notch hole must be made longer in accordance with the movement length because the sub-chassis moves. Notches and holes provided in the sub-chassis lead to lower rigidity of the chassis. For this reason, the verticality accuracy of the components planted on the chassis tends to deteriorate due to the deformation of the chassis. For this purpose, it is necessary to increase the thickness as a measure.

FIG. 4 is a diagram showing the arrangement of a conventional reel base and cassette on the sub-chassis. The reel base is composed of a reel claw, a driven gear, a torque limiter, etc. The structure and arrangement of the reel base governs the height of the gap between the cassette and the sub-chassis, and the sub-chassis is mounted on the sub-chassis. A dead space 46 in the height direction between the cassette and the cassette is created.

An object of the present invention is to wrap the reel base components in the thickness direction of the sub-chassis in consideration of the above-mentioned problem, thereby achieving the elimination of dead space on the upper surface of the sub-chassis and the reduction in thickness by the highly rigid thin-walled chassis.

[Means for Solving the Problems] An object of the present invention is to provide a magnetic recording / reproducing apparatus comprising a subchassis on which a cassette tape is mounted and slid during loading / unloading and a main chassis opposed to the subchassis. This is achieved by a configuration in which the driven gear and the torque limiter, which are parts, are arranged on the surface of the sub-chassis that is not on the cassette mounting side.

[Operation] By arranging the reel base component using the thickness of the sub-chassis, the sub-chassis is provided with a gear that engages with a driven gear that is a reel base component and a braking member that can mesh with the driven gear. Because it can be placed on the bottom,
The area of the notch and the hole provided in the sub-chassis is reduced, and the deterioration of the rigidity can be suppressed. Therefore, it is possible to suppress the deformation of the chassis due to the high processing accuracy and the external force at the time of mounting the cassette without increasing the thickness of the sheet, and to dispose only the claw for engaging the cassette hub on the upper surface of the sub-chassis, and the lower surface of the cassette and the sub-chassis. The gap between the upper surfaces can be minimized.

Therefore, a small size and high performance can be achieved by reducing the thickness of the chassis and ensuring the accuracy of parts.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

1 and 2 are plan views showing a main part of the magnetic recording / reproducing apparatus of the present invention, and FIG. 3 is a sectional view of a reel base of the present invention.

FIG. 1 shows a state of unloading. FIG. 2 shows a state in which loading is completed. 1 and 2, 1 is a main chassis, 2 is a sub-chassis, 3 is a cassette, 4 is a mode motor fixed on the main chassis, 5 is rotatably supported on the main chassis, and is associated with a gear train 6. When the combined mode cam and mode motor 4 are driven, the mode cam 5 is driven to rotate via the gear train 6 engaged with the mode motor 4. 7 is a sector gear, 8 is a chassis arm,
Reference numeral 9 denotes a main arm. The sector gear 7 which engages with the cam groove 5-a, the chassis arm 8 which engages with the cam groove 5-b, and the main arm 9 which engages with the end face of the mode cam by rotation of the mode cam 5. It rotates about a support shaft provided on the chassis 1.

10 is a loading gear, 11, 12, 13, and 14 are arms, 15 is a guide roller, 16 is a guide base on which the guide roller 15 is mounted, 17 is an inclined pin, 18 is a guide roller, and 19 is an inclined pin.
The two loading gears 10 rotate with the rotation of the fan-shaped gear 7 and the guide base on which the guide roller 17 and the guide roller 18 are mounted. At the same time, the arms 11, 12, 13, and 14 slide on guide grooves (not shown), Then, the tapes 16 and 17 are moved to predetermined positions (FIG. 2), and are pressed against a catcher (not shown) to wind the tape around the rotating drum 20.

Reference numeral 21 denotes a rotation axis of the chassis arm 8, and the chassis arm 8 rotates about the rotation axis 21.
The sub-chassis 23 is slid from the first cassette position to the second cassette position by the pins 22 implanted in the sub-chassis.

23 is a pressure arm, 24 is a pinch roller arm, 25 is a pinch roller, 26 is a capstan, pinch roller 25 is planted on the pinch roller arm 24, and the rotation of the main arm 9 causes the pressure arm 23 to become a pinch roller. The arm 22 is turned, and the pinch roller 25 is turned from the position shown in FIG. 1 to the position shown in FIG.

27 is a slider A, 28 is a brake A, and the slider A is mounted on the sub-chassis 2, moves in the direction A by loading, engages with the main arm pin 9-a, and slides in the direction B by the movement of the main arm 9. And brake A2
8 control.

29 is a brake arm B, 30 is a brake B, 31 is a slider B, 32 is a rotary clutch, and a brake arm 29 is rotatably mounted on a rotary shaft on the main chassis, is driven by the main arm 9, and is driven by the main arm 9. To control the brake B30, the slider B31, and the rotating clutch 32 attached to the controller.

33 is a relay pulley, 34 is a swing idler, 35 is a belt, 36
Is take-up reel stand, 37 is supply reel stand, capstan 26
Is transmitted to the pulley 33 via the belt 35, and the swing idler 34 selectively engages with the driven gears of the take-up reel base 36 and the supply reel base 37.

In FIG. 3, 38 is a reel claw, 39 is a reel holder, 40 is a rotating shaft, 41 is a spring holder, 42 is a gear, 43 is a felt, 44 is a retainer, and 45 is a compression spring. Reel stand 3
6 and 37 are constituted by fixing the reel support 39 to the sub-chassis 2 and holding the rotating shaft 40, the compression spring 45, the spring retainer 41 and the gear 42 between the retaining 44 and the reel claw 38.

Therefore, by arranging the operation and operated members between the main chassis and the sub-chassis as described above to form a reel base, the reel base receiver 39 is provided as a component of the reel base on the cassette mounting surface of the sub-chassis 2. The sub-chassis 2 is located only depending on the height of the reel support 39.
And the gap between the cassettes.

[Effects of the Invention] According to the present embodiment, it is possible to suppress the deterioration of the rigidity of the thin plate chassis, and it is possible to secure the component precision for realizing high precision processing and high performance. Further, since the operated member can be operated without going through the notch of the sub-chassis, reliable driving can be performed. Furthermore, the dead space in the height direction between the cassette mounting surface of the sub-chassis and the cassette can be reduced, which is effective in reducing the thickness of the mechanism.

[Brief description of the drawings]

1 and 2 are diagrams showing an outline of the component arrangement of the present invention. FIG. 1 shows a mechanism configuration in an unloading state, and FIG. 2 shows a mechanism configuration in a loading state. . FIG. 3 is a view showing a structure of a reel base for making the mechanism thinner. FIG. 4 is a view showing a conventional arrangement of a reel stand and a cassette on a sub-chassis, and FIG. 5 is a view showing an arrangement of a reel stand and a cassette according to the present invention. 1 ... main chassis, 2 ... sub-chassis, 4 ... mode cam, 6 ... sector gear, 8 ... main arm, 21 ...
… Swing idler, 35 …… Reel support.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Katsuhiko Izumi, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliances Research Laboratory, Hitachi, Ltd. Hitachi Home Appliances Laboratory

Claims (1)

(57) [Claims] 1. A cassette (4) having a tape wound thereon is moved from a first cassette position to a second cassette position forming a predetermined tape running path, thereby opening an opening of the cassette (4) and a rotating drum. (20) is wrapped, tape loading is performed, and a magnetic recording / reproducing apparatus for recording / reproducing to / from a tape by a rotating drum (20) on which a plurality of magnetic heads are mounted, reciprocates with the cassette (4), Reel stand (36,37) that engages with a reel hub stored in cassette (4)
And a main chassis (1) supporting the sub-chassis (2)
And a holding means (39) fixed to the sub-chassis (2); a driven gear (42) supported by the holding means (39); and a torque limiter. (43,44) and a reel claw (38), wherein the driven gear (42) and the torque limiter (43,44) are arranged on a surface of the sub-chassis (2) that is not on the cassette mounting side. A magnetic recording and reproducing apparatus characterized by the following.