JPS5923252Y2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic recording and reproducing device that performs recording and reproducing by pulling out a magnetic tape from a tape cassette and bringing it into contact with a magnetic head. The drive torque of the knoll stand during unloading, which is when the tape is rewound into the tape cassette, is switched to prevent excessive tape tension from being applied to the tape.

One embodiment will be described below with reference to the drawings.

In the drawing, 1 has a supply reel 2 and a take-up knoll 3 inside.
4.5 is a tape cassette containing a supply reel stand and a take-up reel stand, respectively.

Reference numerals 6 and 6' designate tape pull-out pins implanted on the movable tables 7 and 7', respectively, which are moved in the direction of the arrow to the position shown by the dotted line in FIG. As shown, it is wound around the head cylinder 9 at a predetermined angle.

Note that 10.11 is an erasing head and an audio signal head.

At the time of tape loading, the drawn tape is stored in the tape cassette 1 by moving the moving tables 7, 7' in the direction opposite to the arrows and rotating the reel table 4 in the tape winding direction. be.

Further, when fast forwarding or rewinding a tape, the tape is generally stored in a tape cassette.

In the above configuration, the reel stand 4 is rotated in the tape winding direction during tape unloading and tape rewinding.
The following problem arises when the

That is, at the time of unloading, the other knoll stand 5 is naturally braked, but on the contrary, it is rotated in the tape winding direction, so that the tape slack due to the return operation of the tape pull-out pin 6, 6' is exceeded. When the reel stand 4 is rotated, excessive tension is applied to the tape, causing permanent distortion of the tape.

The present invention provides a means to solve this problem, and is configured to reduce the winding torque 7 during unloading using a simple structure.

In FIG. 1, reference numeral 12 denotes an intermediate idler which is a feature of the present invention and has a configuration as described below, and is provided on an arm (not shown) as is conventionally known, and is used on a reel stand during rewinding and unloading. 4 and provides driving force.

13 is a brake arm that has a brake shoe 14 at one end and is connected to a solenoid 15 at the other end and rotates around a shaft 16. The brake shoe 14 is connected to a brake friction roller 30 of the intermediate idler 12, which will be described later. It is configured to be detachable.

Next, the configuration of the intermediate idler 12 will be explained.

FIG. 2 shows a cross section thereof, and 20 is a pulley rotatably loosely fitted to a shaft 21, and is rotationally driven by a belt or the like from a drive motor (not shown).

A driven pulley 22 is fixed to the shaft 21, and is pressed against the pulley 20 through a friction material layer 23 such as felt, so that its rotational force is transmitted.

24 is a boss fixed to the shaft 21; 25 is a body rotatably provided on the boss 24; the spring 25 is interposed between the body 25 and the pulley 20; The pulley 20 is always pressed against the driven pulley 22 via the friction material layer 23.

Reference numeral 27 denotes a boss provided at the end of the shaft 21, and an idler 29 is fixed to the boss 27, which has a rubber ring 28 on its outer periphery that presses against the reel stand 4.

30 is a brake friction roller rotatably provided on the boss 27, and includes a friction material layer 31 such as felt.
The idler 29 is pressed into contact with the idler 29 via.

32 is a stopper fixed to the boss 27, a spring 33 is inserted between this stopper 32 and the friction roller 30, and the annular washer 3 of this spring 33
4 and the friction material layer 35, the friction roller 30 is pressed against the idler 29.

Note that 36 is a rubber ring provided on the outer periphery of the friction roller 30.

Next, this operation will be explained.

During rewinding, the rotational force of the boot 20 is transmitted to the driven pulley 22 via the friction material layer 23, and the shaft 2L idler 29
is transmitted to the reel stand 4 via.

At this time, the brake shoe 14 and the friction roller 30
Since the friction roller 30 is not in pressure contact with the idler 29, the friction roller 30 rotates together with the idler 29, and the shaft 21 (driven pulley 22
) does not result in a particularly large rotational load.

During unloading, the solenoid 15 is driven and the brake shoe 14 is brought into pressure contact with the friction roller 30.

Therefore, since the rotation of the friction roller 30 is stopped, a predetermined braking force is applied to the rotation of the idler 29 by the friction material layer 31.

That is, the load on the driven pulley 22 increases.

When a load of more than a predetermined value is applied to the driven pulley 22, the friction material layer 23 causes a slip and the rotational force of the pulley 20 is not transmitted to the driven pulley 22.
Adding a load to the second side reduces the maximum load that can be applied to the tape.

As described above, according to the present invention, with a simple configuration, it is possible to switch the rotation l/rook of the reel stand during unloading and rewinding, and to apply braking indirectly during unloading, the tape No excessive force is applied to the
It is possible to solve the problem of tape damage due to excessive tape tension.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an embodiment of the present invention, and FIG. 2 is a sectional view of the main parts thereof. 1...Tape cassette, 4...Reel stand, 6゜6'...Tape pull-out pin, 8...
...Magnetic tape, 12...Intermediate idler, 14
...Flake shoe, 20...Pulley, 21... Rotating shaft, 22... Driven pulley, 23.31°35... Friction material layer, 29.
...Idler, 30...Friction roller.

Claims (1)

[Scope of utility model registration request] A tape loading mechanism for pulling out a magnetic tape from a tape cassette using a tape pull-out pin and mounting it on a rotating cylinder; and an intermediate idler for transmitting driving force to a reel stand when rewinding the tape and storing the tape in the tape cassette. a friction roller that is pressed by the intermediate idler and rotates together with the intermediate idler due to friction; and a brake shoe that contacts the friction roller when storing the tape and applies a predetermined braking force to the friction roller. A magnetic recording and reproducing device.