JPS587491Y2 - Reel shaft rotation control mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reel shaft rotation control mechanism that is simple and compact.

Conventionally, a braking means and a constant tension applying means are disposed on the reel shaft of a magnetic recording/reproducing device, each with a different operating mechanism, which not only complicates the mechanism but also hinders miniaturization.

Therefore, the present invention provides a reel shaft rotation control mechanism that stabilizes tape running by displacing a rotation control member that integrates a braking means and a constant tension applying means into at least two positions depending on the tape running mode. This is what we would like to propose.

First, the basic operations shown in FIGS. 1 to 3 will be explained in detail.

Note that FIG. 1 is an explanatory diagram of a driving state, FIG. 2 is an explanatory diagram of a driven state, and FIG. 3 is an explanatory diagram of a stopped state.

The main components in the figure are a rotation control member A, a reel drive unit B, and a positioning member 6. It is composed of a rotating plate 1 that controls the rotation, and an adjustment plate 3 that is adjustable and supported on the rotating plate 1 and controls the constant tension applying means,
Furthermore, the rotating plate 1 is connected to an upper reel stand 5 of a rotating stand 5, which will be described later.
A A rubber brake shoe 1a is provided at a position in contact with the outer periphery, and is urged clockwise around the column 2 by the first spring 4, and the adjustment plate 3 has a lower reel stand 5b of the rotary table 5 at its tip. It has a tension lever 3b with a tension shoe 3a that comes into contact with the outer periphery of the rotating plate 1, and the rotating plate 1 is connected to the rotating plate 1 by an adjustment screw 3b screwed into a notch 3e around a pivot 3c planted in the rotating plate 1. By adjusting the fixed position relative to the adjusting plate 3, the amount of tension of the constant tension applying means can be adjusted.

Note that the reel drive section B that drives the reel has a shaft section that engages with the reel, but this is omitted because it is not directly related to the present invention, and only the rotary table 5 with which the idler and the like come into contact is shown. Only a portion of the positioning member 6, which is pivotally supported by the second support column 7 and abuts against the rotation plate 1 to restrict its rotation position, is shown in the drawings.

In the above configuration, a. When the reel drive section is directly driven (as shown in Figure 1)
As described later, the positioning member 6 rotates largely clockwise around the second support 7, so the rotating plate 1 rotates counterclockwise and rotates around the outer periphery of the lower reel base 5b of the rotary base 5. On the other hand, the tension shoe 3a is connected to the upper reel stand 5a.
The brake shoes 1a are kept in contact with each other on the outer periphery,
The tape can be wound without any problems.

b When the reel drive section B is in the driven state (as shown in FIG. 2), the positioning member 6 rotates the rotating plate 1, and only the tension shoe 3a is placed on the outer periphery of the lower reel stand 5b of the rotating table 5. are kept in contact with each other, and a constant tension is applied to the tape being fed out.

Note that the mounting state of the adjustment plate 3 must be adjusted in advance according to the desired amount of tension.

C: When the reel drive unit B is in a stopped state (as shown in FIG. 3), the positioning member 6 rotates counterclockwise and breaks contact with the rotating plate 1, so that the first spring 4 is not attached. Due to the force, the brake shoe 1a together with the tension shoe 3a comes into pressure contact with the outer circumferences of the lower reel stand 5b and the upper reel stand 5a of the rotary table 5, respectively, to stop the rotation of the reel and drive section B and interrupt the transfer of the tape.

In this embodiment, the tension shoe 3a and the brake shoe 1a are brought into pressure contact with the rotary table 5 in the above-mentioned stopped state, but in this mode, substantially only the brake shoe 1a is brought into contact with the rotation table 5. Therefore, there is no particular need for the tension shoe 3a to be brought into pressure contact, and a separate releasing means may be provided to release the pressure contact of the tension shoe 3a.

In order to further explain the present invention in detail, a specific embodiment shown in FIG. 4 will be described below.

In this embodiment, the present invention is applied to a reel drive section on the take-up side of a video tape recorder.

Therefore, it is necessary to put it into the driving state during recording and playback and fast forwarding, and to put it into the driven state when rewinding.

Therefore, in this embodiment, in order to selectively switch the positioning member 6 to three positions so that it can assume three types of states including the stopped state, first, the positioning member 6 is moved counterclockwise by the second spring 8. direction, and the long side portion 6 of the positioning member 6
Three protrusions of different heights are provided at a, and facing each protrusion, a playback lever PLAY, fast forward lever F/FWD, and rewind lever REW are provided, and each lever is moved from position a to position b in the figure. It is configured such that the lever at position b can be unlocked by the stop lever 5TOP.

The convex portion provided on the long side 6a of the positioning member changes the locking position of the positioning member 6 to the stopped state when the regeneration lever PLAY is in the released state, and the regeneration lever PLAY to the stopped position.
When Y or fast forward lever F @FWD is in position b,
It is necessary to set the height so that the locking position of the positioning member 6 is in the driving state and the locking position of the positioning member 6 is in the driven state when the rewind lever REW is in the b position.

Therefore, if the present invention, which can be made compact, is adopted, the drive idler, the fast-feed idler, and various pressure contact mechanisms thereof can be installed near the rotary table on the take-up reel side without any restriction. I can do it.

Further, by adjusting the relative fixing position of the rotary plate 1 and the adjusting plate 3 using an adjusting screw, the amount of tension of the constant tension applying means can be easily adjusted.

[Brief explanation of drawings]

Fig. 1 is a plan view of the driving state showing the violent operation of the present invention, Fig. 2 is a plan view of the driven state, Fig. 3 is a plan view of the stopped state, and Fig. 4 is a plan view of an embodiment of the invention. The respective plan views shown are revealed. Explanation of main drawing numbers, A...Rotation control member, B...IJ
- wheel drive member, 6... positioning member, 3a... tension shoe, 1a... brake shoe.

Claims (2)

[Scope of utility model registration request] (1) A braking means, a constant tension applying means provided integrally with the braking means, a control member that integrally drives these and displaces them into at least two states, and the braking means and the tension applying means in the first state of the control member, only the constant tension applying means is brought into pressure contact with the outer periphery of the rotary table, and in the second state, the rotation A reel shaft rotation control mechanism comprising the braking means pressed against the outer periphery of the stand. (2) displacing the control member in three states; in the first state, only the constant tension applying means is brought into contact with the outer periphery of the rotating table; in the second state, the braking is applied to the outer periphery of the rotating table; The reel shaft rotation control mechanism according to claim 1, wherein the means are brought into contact with each other, and the constant tension applying means and the braking means are separated from the outer periphery of the rotary table in the third state.