JPS59113547A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To stabilize the damping force given to a reel base and facilitate the check and the adjustment, by attaching a reel motor unit to a chassis unit to transmit the motion of an operating member to a brake means. CONSTITUTION:A magnetic tape 11 wound around a guide drum 24 by a loading motor 18 is transported by a driving mechanism consisting of a capstan and an pinch roller and is wound around either of reel bases 10a and 10b incorporating driving motors. Brakes 14a and 14b which damp the rotation are brought into contact with these reel bases 10a and 10b, and brakes 14a and 14b are separated from reel bases 10a and 10b by the motion of a rod 22 in the direction of an arrow A. The rod 22 is driven by a cam 20 and a cam follower 26, and the cam 20 is rotated by the loading motor 18. The loading motor 18 loads the magnetic tape 11 and switches various modes in this manner.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing device that can be used in tape recorders and video tape recorders.

Conventional configuration and its problems To explain a video tape recorder configured as shown in FIG. 3 using FIGS. 1 and 2 as an example, a reel for winding a magnetic tape 11 is driven. A reel stand 10a with a built-in dead motor.

10b is rotatably attached to the reel board 12.

On the other hand, brakes 14a, 14t) for braking the rotation of the reel stands 101L, 10b are rotatably attached to the chassis board 16.
This is done by moving the rod 22 in the direction of the arrow with a cam 20 driven by a loading motor 18 that controls the magnetic tape pull-out operation and various operating modes.

When the reel board 12 shown in FIG. 2 is attached to the chassis board 16 shown in FIG. 1, the reel stands 1o2L, 1ob are braked by the brakes 14a, 14b, as shown in FIG. 3.

However, this structure is different from the reel stand 10a.

1ob and the brakes 14a and 14b are arranged on different boards, so the reel stand 10a.

The positional accuracy between 1ob and the brakes 14a, 14b is extremely poor. For this reason, the reel stand 101L.

Even if the brake torque applied to the reel stand 10b is unstable or the brakes 14a, 14b are released, the brakes 14a, 14b may not be able to maintain the reel stand 10a, 1o.
When I solved b, the same problem occurred.

OBJECTS OF THE INVENTION The purpose of the present invention is to improve the above-mentioned conventional drawbacks, to make the braking force applied to the reel stand extremely stable, and to provide a magnetic recording and reproducing device that is easy to inspect and adjust. be.

Structure of the Invention The magnetic recording and reproducing apparatus of the present invention comprises a pair of reel stands that engage with a pair of reels capable of winding a magnetic tape and rotate together with each reel, and a motor that drives the pair of reel stands. and a reel motor unit including a brake means for mechanically braking the rotational force of the motor or reel stand, a magnetic head for recording or reproducing signals on the magnetic tape, and transporting the magnetic tape at a constant speed. a loading means for attaching the magnetic tape to the magnetic head; a mode switching means for switching the transfer mode of the magnetic tape; and a reel motor unit according to the mode of the mode switching means. a chassis unit including an operating member for mechanically operating the brake means, and by attaching the reel motor unit to the chassis unit, the operating member and the brake means are engaged, and the reel motor unit is attached to the chassis unit. It is constructed so that the movement of the operating member is transmitted to the brake means, and this improves the accuracy of the positional relationship between the reel motor unit and the brake means. can be easily performed.

DESCRIPTION OF THE EMBODIMENTS The present invention will be described below with reference to the drawings by way of an example implemented in a video tape recorder.

FIG. 4 shows a plan view of essential parts of an embodiment of the present invention. In the figure, the magnetic tape 11 wound around the guide drum 24 by the loading motor 18 is driven by a drive mechanism (not shown) consisting of a capstan and a pinch roller.
The reel stand 10a is transported by the reel stand 10a and has a built-in driving motor.

10b.

The reel stands 101L, 10b are in contact with dowel brakes 14&, '14b for braking the rotation, and the reel stands IQ& of the brakes 14a, 14t).

The contact with 1ob is released by movement of the rod 22 in the direction of the arrow. Rod 22 connects cam 2o and cam follower 2
6, and the cam 20 is rotated by a loading motor 18.

The loading motor 18 is connected to the magnetic tape 11 as described above.
loading and transitioning to various modes.

Said rod 22. Cam 20. Cam follower 26. Loading motor 18. The guide drum 24 is placed on the chassis board 16 as shown in FIG.
a, 1ob, brakes 14a, 14b are placed on the reel board 12 as shown in FIG.
When the reel board 12 is attached to the reel, the brakes 141L, 14b and the rod 22 are arranged in a normal positional relationship as shown in FIG.

Effects of the Invention As described above, in the present invention, since the reel stand and the brake means are arranged in the same unit, the positional relationship between the reel stand and the brake means is maintained with extremely high accuracy, and the reel stand and the brake means can be reeled with high accuracy. The braking force applied to the single unit is extremely stable.

Further, since the brake means and the reel stand can be assembled as a unit, they can be inspected and adjusted individually before being attached to the chassis board, and productivity can be improved.

[Brief explanation of drawings]

Fig. 1 is a plan view of a chassis board unit of a conventional magnetic recording/reproducing device, Fig. 2 is a plan view of a reel board unit of the same device, Fig. 3 is a plan view of the same device after assembly, and Fig. 4 is a plan view of a main body of the same device. FIG. 6 is a plan view of a magnetic recording/reproducing device according to an embodiment of the invention, FIG. 6 is a plan view of a chassis board unit of the same device, and FIG. 6 is a plan view of a reel board unit of the same device. 101L, 10b---Reel stand, 12---
... Reel board, 14a, 14b... Brake, 16... Chassis board, 18... Loading motor, 20... Cam, 22...
...Roso)", 26...Cam Follower. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 2 W direct l? 101) 13 Fig. 4 Fig. 4 24 Fig. 5 4 Fig. 6/^ tgu sad 14 no
/l)l. −2=

Claims (1)

[Claims] A pair of reel stands that engage with a pair of reels capable of winding magnetic tape and rotate together with the respective reels, a motor that drives the pair of reel stands, and a mechanical system that mechanically generates the rotational force of the motor or the reel stand. A reel motor unit including a brake means for braking,
A magnetic head for recording and reproducing signals on a magnetic tape, a transport means for transporting the magnetic tape at a constant speed, a loading means for attaching the magnetic tape to the magnetic head, and a transport mode for the magnetic tape. a chassis unit including a mode switching means for switching the mode switching means and an operating member for mechanically operating the braking means of the reel motor unit according to the mode of the mode switching means, and the reel motor unit A magnetic recording/reproducing device characterized in that the operating member and the brake means are engaged with each other by being attached to the chassis unit, so that the movement of the operating member is transmitted to the brake means.