JPS6063752A - Magnetic recorder and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a reel braking mechanism and to reduce the cost, by detecting that the reel has almost stopped by utilizing the reel braking mechanism in a cassette, then operating the braking mechanism in the cassette from the outside to lock the reel. CONSTITUTION:When an operation button for stopping mode is depressed, braking force for stopping the rotation is applied to driving mechanisms 23 and 24 by, for example, a driving circuit 50. When the rotation of a winding reel table 23 and feeding reel table 22 almost stops, rotation detected information is transmitted from a means which detects the rotation to a rotation detecting circuit 51 and a signal for operating a brake driving circuit 52 is sent from the circuit 51 to the circuit 52 with a little time lag, a driving means such as electromagnetic solenoid, etc., are operated. When the driving means operate, a driving lever 27 is moved in the direction shown by the arrow (b) and a converting lever 28 makes clockwise rotation around a shaft 29. When the lever 28 makes the rotation, a releasing pin 21 is lowered to make the pin 21 non-contact state with a lever 18, and a feeding reel 11 and winding reel 12 are locked.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording/reproducing device.

Conventional structure and problems There is a brake on the reel stand of a conventional magnetic recording and reproducing device. 1st
In the figure, a supply reel stand 1 and a take-up reel stand 21/C pair 1. Brake levers 3 and 4 are provided for applying the brakes. These brake levers 3 and 4 each have shafts 5
and 6, and is biased by springs 7 and 8 in the direction of contacting the supply reel stand 1 and the take-up reel stand 2. Reference numeral 9 denotes a lever that slides using the guide post 1o as a guide, and the two protrusions 9a and 9b at the tip of this lever 9 are capable of contacting and separating from the ends 3a and 4a of the brake levers 3 and 4, respectively. 9 slides and the protrusions 9a, 9b push the brake levers 3.4 (D-43a, 4a) to release the brakes on the supply reel stand 1 and the take-up reel stand 2 by the brake levers 3, 4, Furthermore, when the protrusions 9a and 9b move away from the ends 3a and aa of the brake levers 3 and 4, the brake levers 3 and 4 come into contact with the supply reel stand 1 and the take-up reel stand 2 by the springs 7 and 8, thereby applying the brakes. More recently, cassettes have been developed in which the brakes on the reel can be released. It is not necessary to provide a brake mechanism for both reels, making the configuration complicated.Also, the brake mechanism installed on the cassette side is designed to release the brake at the same time as the cassette is installed, so it is difficult to drive the tape after installation. (For example, during PLAY, FF, REW, etc.) the tape is slack, and damage to the tape may occur at the start of the operation.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object thereof is to provide a magnetic recording and reproducing apparatus that has a small number of parts, is inexpensive, and does not cause damage to the tape.

Components of the Invention The magnetic recording/reproducing device of the present invention uses a cassette which includes a supply reel and a take-up reel and has a brake mechanism to prevent rotation of both reels, and a brake of the cassette mounted at a predetermined position. a brake release means provided to release the mechanism, a reel rotation means for rotating the supply reel or the take-up reel of the cassette, and a rotation detection means for detecting the rotation state of the reel;
and control means for controlling the brake release means based on the output of the rotation detection means.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings (Figs. 2 to 7).
The explanation will be based on Figure).

Figures 2 to 4 show the reel brake section inside a cassette for a video tape recorder. The uneven portions 11a, 12a, etc. shown in FIG. , 12a and further rotates around the shaft 17 to lock the lock levers 15, 12a.
Lever 18 that contacts the other ends 15b and 16b of 16 at the same time
is provided. As shown in FIGS. 3 and 4, by pressing the operation button with the cassette 19 installed in a predetermined position, the release bin 21 (described later) on the chassis 20 enters the cassette 19, and the lever 18 Press,
Therefore, the lever 18 rotates around the shaft 17.

As a result, the lock levers 15 and 16 are pushed and rotated in the direction of the arrow in FIG. 2, thereby releasing the reel lock.

5 to 7 show the drive section of the brake, in which the supply reel stand 22 and the take-up reel stand 23 provided on the shear 720 are connected to the driving transverse seat 24 attached to the shear 20, respectively. 25. Each reel stand 22.23 and drive mechanism 24.25
It is arranged coaxially with. A guide 26 on the chassis 2o guides the release pin 21. 28 is axis 2
9, one end is in contact with the release pin 211C, and the other end is connected to the drive lever 27 with a shaft 3o.
is pivotally connected to. When the release pin 21 is moved to the predetermined position 1 by the conversion lever 28, a lever 18 in the cassette 19 is operated, and the reel lock by the lock levers 15 and 16 is released by operating the lever 18. It has become.

In FIG. 6, 50 is a drive circuit for driving the drive mechanisms 24 and 25. The drive mechanism 24 , 25 is provided with means (not shown) for detecting the rotation of the take-up reel stand 23 and the supply reel stand 22 , and the rotation detection information is transmitted to the rotation detection circuit 61 .

The drive lever 27 is connected to a drive means (not shown) such as an electromagnetic solenoid.

The brake drive circuit 62 is connected to the aforementioned drive means (not shown) such as an electromagnetic solenoid, and also receives information from the rotation detection circuit 51.

Next, the operation of the present invention will be explained. When a predetermined operation button (for example, PLAY, REW, FF, etc. button) is pressed, the means for driving the drive lever 2a is activated, and the drive lever 27 moves in the direction of arrow A in FIG. 7, thereby causing the conversion lever to move. 28 rotates counterclockwise around a shaft 29 to raise the release bottle 21 along the guide 26. As the release bin 21 rises, the lever 18 in the cassette 19 is actuated to release the reel lock by the lock levers 15 and 16. In this state, the drive mechanism 24°26
The zero circuit operates and the reel stand is driven in accordance with a predetermined operation. For example, at the time of FF, the drive mechanism 26 of the take-up reel stand 23 rotates at full power, and the drive mechanism 2 of the supply reel stand 22 rotates at full power.
4 is busy with free work.

Next, when the operation button for the stop mode is pressed, a braking force is applied to the drive mechanisms 23 and 24 to stop their rotation, for example, by the drive circuit 5o. When the rotation of the take-up reel stand 23 and the supply reel stand 22 has almost stopped, the rotation detection information is transmitted from rotation detecting means (not shown) to the rotation detection circuit 61, and the rotation detection circuit 61 then outputs the brake. After a slight time lag, a signal is sent to the drive circuit 52 to activate the brake drive circuit 52, thereby activating a drive means (not shown) such as an electromagnetic solenoid.

As a result, in FIG. 7, the drive lever 27 moves in the direction of the arrow, and the conversion lever 28 rotates clockwise about the shaft 29. As a result, the release bin 21 descends and becomes out of contact with the lever 18, and the supply reel 119 winds up.
12 is locked.

Effects of the Invention As described above, according to the present invention, the reel brake mechanism inside the cassette is used to detect when the reel has almost stopped, and then the brake mechanism inside the cassette is operated from outside the cassette to lock the reel. Therefore, the reel brake mechanism as a mechanism of a conventional magnetic recording/reproducing device can be greatly simplified, and costs can be reduced.

For example, in conventional devices where the reel brake is released at the same time as the cassette is installed, the tape may become slack before and after the cassette is installed, which can cause tape damage. However, according to the present invention, such tape damage does not occur at all.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional example, Figs. 2 to 7 show an embodiment of the present invention, Fig. 2 is a plan view of the brake section inside the cassette, and Fig. 3 is a plan view when the cassette is installed. Figure 4 is a schematic front view of the cassette, and Figure 4 is a schematic side sectional view of the cassette when it is installed.
FIG. 6 is a schematic plan view of the brake driving section, FIG. 6 is a schematic front view thereof, and FIG. 7 is an enlarged view thereof. 11... Supply reel, 11a... Uneven part, 1
2... Take-up reel, 12a... Uneven part, 13
．． 14...axis, 15, 16---0tsu l/A
-, 1sa. 4 chitu・0. ...-Brouse 1gb, 16b...Other end-17,...10 Beige...M, 18-...Lever, 19...Cassette, 20-Shaun, 21...・Release bottle, 22
-... Supply reel stand, 23... Take-up reel stand, 24
．． 26... Drive mechanism, 26... Guide, 27
-... Drive lever, 28... Conversion lever, 29
．． 30...Axis, 50...Drive circuit, 51...
... Rotation detection circuit, 52 ... Brake drive circuit.

Claims (1)

[Claims] A cassette having a supply reel and a take-up reel therein and a brake mechanism for preventing rotation of these reels is used, and a brake release means is provided to release the brake mechanism of the cassette mounted at a predetermined position. , a reel rotation means for rotating a supply reel or a take-up reel of the cassette, a rotation detection means for detecting the rotation state of the reel, and a control means for controlling the brake release means depending on the output of the rotation detection means. A magnetic recording and reproducing device comprising: