JPS58121168A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize a simple constitution and to make its thickness thin for a magnetic recording/reproducing device, by using a timing belt. CONSTITUTION:An idler 22 having a member of rubber, etc. having a high coefficient of friction at its outer circumference is held freely rotatably on a lever 26 which can turn freely centering on a shaft 24 and pressed to a driving wheel 12 by a spring 28. The revolution of the idler 22 is transmitted to a relaying gear 32 which is supported rotatably to a shaft and via a timing belt 30 having a tooth form 22' at its inner circumference and a tooth form 30' of the same shape as the form 22'. The gear 32 has a tooth form 32' of the same shape as the form 30' of the belt 30 at the part where the belt 30 is hooked. Thus the revolution of the idler 22 is transmitted to the gear 32 with no slip.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, the motor that drives the capstan shaft also drives the reel stand. A so-called one-motor drive type magnetic recording/reproducing device (however, the magnetic recording/reproducing device referred to here is
The present invention aims to provide a magnetic recording and reproducing device that has a simple structure and a power transmission structure that can be easily made thinner (including devices that have only either a recording function or a reproducing function). It is.

Hereinafter, the present invention will be explained based on illustrated embodiments.

In FIGS. 1, 2, and 3, a capstan shaft 1o, which is common to the motor shaft, has a driving wheel 12 coaxially thereon, and is rotated by a motor 14. A pinch roller 20 is rotatably held on a rotatable lever 18 with a magnetic tape 16 sandwiched between the capstan shaft 1o.
The magnetic tape 16 is clamped and fed at a constant speed.

Idler 2 having a material with a high friction coefficient such as rubber on the outer periphery
2 is rotatably held on a lever 26 which is rotatable about a shaft 24, and is pressed against the drive wheel 12 by a spring 28.

The idler 22 has a tooth profile 22' on the outer periphery, and the inner periphery VC
The signal is transmitted to a rotatably supported relay gear 32 via a timing belt 30 having a tooth profile 30' having the same shape as the tooth profile 22' on the outer periphery of the idler 22. The relay gear 32 has a portion V on which the timing belt 30 is applied.
A tooth profile 32' having the same shape as the tooth profile 30' of the timing belt 3° is formed, so that the rotation of the idler 22 is transmitted to the relay gear 32 without slipping.

An arm 34 is coaxially supported by the relay gear 32, and the relay gear 32 and arm 34 are connected to the relay gear 3.
a hysteresis material 31 fixed to the inner periphery of the arm 341, which faces the hysteresis material 31 in the circumferential direction;
C-fixed circular contact portion 3 consisting of an annular magnet 33
5, they are magnetically coupled in a non-contact manner. As a result, the arm 34 rotates in the same direction as the rotational direction of the relay gear 32, is rotatably held at the tip of the arm 34, and meshes with the gear portion of the relay gear 32.
The idler gear 36 corresponds to the rotational direction of the relay gear 32 and transmits the rotation to the miter gears 38, 38'9'.

The limiter gears 38 and 38' are coaxially arranged (and have reel idler gears 40 and 40', and the limiter gears 38 and 38' and the reel idler gears 40 and 4Q' are compressed and coupled by a spring 41 via a felt 39. Therefore, even if a certain torque or more is applied to the limiter gears 38, 38', rotational power is not transmitted to the reel idler gears 40, 40'.The reel idler gears 40, 40' The outer peripheral gear portion of the magnetic tape 1 is engaged with a rotatable reel stand 42, 42' having a gear on the outer periphery, and the reel stands 42, 42' are connected to the magnetic tape 1.
A reel (not shown) for winding up 6 is driven to rotate.

In Figure 1, the capstan shaft 1o and the pinch roller
The magnetic tape 16 is transferred in the direction of the arrow by 20V.
In order to wind the magnetic tape 16 without slack on the reel stand 42, the magnetic tape 16 must be connected to the capstan shaft 1o and the pinch roller 20.
It is necessary to rotate the reel stand 42 at a circumferential speed that is always higher than the speed at which the magnetic tape 16 is fed out. A slip is caused between the limiter gear 38 and the reel idler gear 40.

FIGS. 2 and 3 show a state in which the magnetic tape 17 is wound by the reel stand 42 without being transported by the capstan shaft 10 and the pinch roller 2o. According to this V, the timing bell that transmits the rotation of the drive wheel 12)3
A rolling contact idler 44 is rotatably held on the outer periphery of the relay gear 32 to which the belt 30 is attached, in contact with the outer periphery of the belt 30. The rolling idler 44 is connected to a lever 46,
It is rotatably held via a friction member consisting of a felt 45 and a spring 47, and the lever 46 is rotatably held by an arm 48. The arm 48 has a structure that is rotatable around a shaft 60, and the magnetic tape 16 is rotated by a capstan shaft 1o and a pinch roller 20 shown in FIG.
In the mode in which the transfer idler 44
are held in a position that does not contact any of the outer peripheries of the reel idler gear 40, 40' and the belt 3o, but only the IJ/stands 42, 42' shown in FIG. 16, the arm 48 supporting the rotary contact idler 44 is rotated counterclockwise about the shaft 50 by a spring (not shown), and the rotary contact idler 44 is rotated by the timing bell. )30
IJ-luid dragger 40 in a direction corresponding to the moving direction VC of the outer periphery of the timing bell) 30.
, 40' are rotatably crimped by the resistance of the friction member made of the felt 45 and spring 47, and the relay gear 32 is
The rotation is transmitted to the reel idler gears 40, 40', and directly drives the reel stands 42, 42' without going through the limiter composed of the felt 39 and the spring 41. Therefore, the rotation is transmitted from the drive wheel 12. Further, the rotational torque of the idler 220 is transmitted to the reel stand 42 without slipping, and the magnetic tape 16 is transferred to the reel stand 42 with sufficient tension regardless of the winding diameter.
It is wound up with (yo-).

As described above, by using a timing belt, the present invention not only enables synchronized rotational force transmission without slipping, compared to conventional flat belts that rely on transmission only by friction. , unlike a flat belt, the transmission torque does not depend on the initial tension, so the initial tension of the timing belt is hardly required, and the rotation shaft of the idler (corresponding to 22 in the above embodiment) and rotating body (corresponding to 32 in the same example) The lateral pressure applied to the can be made extremely small. This reduces transmission torque loss and increases reliability.

Of course, you can get high-quality equipment.

Since the rolling contact idler is placed in contact with the back surface of the timing belt to transmit rotation, space loss in the height direction is extremely small, and a thin magnetic recording/reproducing device can be easily realized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main parts of a magnetic recording and reproducing apparatus according to an embodiment of the present invention in a tape constant speed running state, and FIG. 2 is a plan view of main parts of the same embodiment of the present invention in a reel-driven tape running state. FIG. 3 is a sectional view of essential parts of an embodiment of the invention. 1o...capstan shaft, 12...driver, 14...@0 motor, 160 middle Q magnetic tape, 22, 0 fist idler, 22' ...l
Tooth profile, 26...0 lever 28...011 spring, 3o...timing held, 30' 66
666m Tooth profile, 32 @1111111111 Relay gear, 32'... Gear, 34... Fist arm, 35e... Relocation part, 36... Idler gear, 38.38 '・・・・・・Limiter gear, 4o
・・・・・・- Reel idler gear, 4200Φ・Reel stand, 44・・＠−・Fist contact idler.

Claims (1)

[Claims] A capstan shaft that transports a magnetic tape at a constant speed, an idler that rotates in conjunction with the capstan shaft and has a tooth profile on its outer periphery, and a tooth profile on its inner periphery to mesh with the tooth profile of the jig idler. a rotating body having a tooth profile on its outer periphery to mesh with the tooth profile of the timing belt, a pair of reel stands for winding up the magnetic tape, and a surface portion having the tooth profile of the timing belt. a selective rotation transmission mechanism that is in contact with the opposite surface and selectively transmits the rotation of the rotating body to one of the pair of reel stands; A magnetic recording/reproducing device characterized in that it is configured to transmit information to a reel stand corresponding to a direction.