JPH0335740B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape drive device used in a reel-to-reel type, cassette type, or other magnetic recording/reproducing device.

Conventional Structure and Problems Generally, a tape drive device such as a tape recorder is composed of a capstan and a pinch roller made of an elastic material such as rubber that comes into contact with the capstan. Tape driving by the pinch roller in contact with the capstan generates the necessary tape driving force only when the pinch roller's contact force exceeds a certain value, and actual tape driving depends on the size of the load, Due to variations in component dimensions and assembly, everything is not constant, and as a result, the timing between the start of winding of the take-up reel that winds the tape fed by this tape drive device varies, and problems such as tape winding occur. There was a problem that occurred. In addition, when the pinch roller is moved backward from a constant speed tape running state to fast-forward or rewind the tape, if the pinch roller does not move back enough, the tape touches the pinch roller and rotates, causing uneven tape running. There were some inconveniences such as noise and rotation noise.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the prior art, namely, by applying a brake to the pinch roller and releasing the brake immediately before the pinch roller completely contacts the capstan. This makes the starting timing of the tape constant, and the time it takes to reach a constant speed after starting is extremely short, thereby preventing troubles such as tape winding.

Structure of the Invention The present invention provides a brake means for applying a brake to the pinch roller when the pinch roller is not in contact with the capstan, and brakes the pinch roller at any position from the start of contact with the capstan to the completion of contact. A brake release means is provided for releasing the brake of the pinch roller by the means.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 is a fixed substrate; 2 is a capstan that is rotatably supported by the fixed substrate 1 and rotates at a constant speed; 3 is a pinch roller made of an elastic material such as rubber; and 4 is a pinch roller that supports the pinch roller 3 in a rotatable manner. The pinch roller support arm 5 is supported by the fixed base plate 1 by a pivot shaft of the pinch roller support arm 4. Reference numeral 6 denotes a brake whose base is fixed to the pinch roller support arm 4, and is made of a plate-shaped elastic material. The pinch roller 3 is braked by pressing against the side surface of the pinch roller 3. 7 is fixed board 1
It is a brake release member provided on the top, and 8 is a tape.

With the above configuration, when the pinch roller support arm 4 is rotated clockwise to drive the tape, the pinch roller 3 is rotated as shown in FIG.
begins to come into contact with the capstan 2, but in this state the brake 6 is still in pressure contact with the pinch roller 3 to apply the brake, preventing the pinch roller 3 from rotating. Then, in the process of further rotating the pinch roller support arm 4, the tip of the brake 6 comes into contact with the brake release member 7, and the brake 6 separates from the outer periphery of the pinch roller 3, as shown in FIG. When the tape 8 completes contact with the capstan 2, the brake of the pinch roller 3 is released, and the pinch roller 3 becomes freely rotated, driving the tape 8 together with the capstan 2 at a constant speed. In this way, the brake of the pinch roller 3 is automatically released from the time the pinch roller 3 starts contacting the capstan 2 until the contact is completed, and the timing for driving the tape 8 becomes constant. This prevents troubles such as tape winding, and when performing fast forwarding or rewinding with the pinch roller 3 slightly separated from the capstan 2,
Since the brake is applied to the pinch roller 3,
Even if the tape 8 touches this pinch roller 3, it will not be rotated. Figures 4 and 5
The figure shows another embodiment, in which the pinch roller support arm 4 is provided on a movable board that can be moved back and forth, a so-called head board 9 on which a head 12 is attached, and this pinch roller support arm 4 is mounted on a pin 15. It is biased clockwise by a spring 10 applied between the two, and the rotation of the bias is prevented by a restriction pin 14. A brake gear 11 is integrally provided at the bottom of the pinch roller 3, and a brake means 13 that can engage with the brake gear 11 is provided on the head board 9. According to this, when the head board 9 is advanced and the pinch roller 3 starts to come into contact with the capstan 2 as shown in FIG. When the head board 9 is further advanced and the pinch roller 3 is in complete pressure contact with the capstan 2 as shown in FIG. The pinch roller 3 is rotated at a constant timing,
Drive the tape 8.

Note that the above-mentioned gear to be braked is not necessarily required, and the same effect can be achieved by directly applying braking to the pinch roller. Further, in the present invention, a mechanism that can adjust the timing of brake release may be provided.

Effects of the Invention As described above, the present invention can accurately regulate the timing at which the pinch roller starts rotating.
The pinch roller, which is an elastic body, can easily solve problems when starting the tape even if there are variations in the tape load or in the timing at which the tape winding force is applied, and its effects are great. .

[Brief explanation of the drawing]

Figure 1 is a top view showing one embodiment of the present invention, Figure 2 is a top view showing one embodiment of the present invention;
Figures 3 and 3 are top views for explaining the same operation, Figures 4 and 5.
The figure is a top view of another embodiment. 2...capstan, 3...pinch roller, 4
... Pinch roller support arm, 6 ... Brake,
7... Brake release member, 8... Tape, 9...
Head board, 11...braked gear, 13...brake means.

Claims (1)

[Scope of Claims] 1. A tape drive device comprising a capstan that rotates at a constant speed and a pinch roller that contacts the capstan and drives the tape at a constant speed, the tape drive device comprising: a capstan that rotates at a constant speed; The roller is characterized by being provided with a brake means for applying a brake to the roller, and a brake release means for releasing the brake on the pinch roller by the brake means at any position from the start of contact of the pinch roller with the capstan to the completion of contact. Tape drive. 2. The tape drive device according to claim 1, wherein the brake means is provided integrally with the pinch roller support arm supporting the pinch roller, and the brake release means is provided on the fixed substrate. 3. The tape drive device according to claim 1, wherein the brake means is provided on a movable head substrate.