JPH03100954A - Reel desk controller - Google Patents

Abstract

PURPOSE:To make torque control satisfactory by locking one end of a torsion coil spring to a stopper, locking the other end to a tape detection arm part, operating the spring in a winding fastening direction when the tension of a tape is weak, and operating it in a winding unfastening direction when the tension is strong. CONSTITUTION:A torsion coil spring 2 is provided on the outer peripheral surface of a resin reel desk 1, one end 2a of the coil spring 2 is hung to a stopper 4 and another end arm 2b of the coil spring 2 is hung to a tape tension detection post 6. When the tension of the tape is smaller than a prescribed value, a tape tension detection arm 5 is operated in a direction, where the winding of the coil spring 2 is fastened, with a fixed part 5a as a fulcrum. Then, frictional force with the disk 1 is enlarged and the tape tension is enlarged. When the tape tension is large, the coil spring 2 is set in the winding unfastening direction and accordingly, the tape tension is made small. Thus, since the necessity of a band brake is eliminated for sticking felt, etc., the number of parts are reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to 1, for example, a digital audio recorder (
The present invention relates to a reel stand control device that controls a reel stand on the tape supply side of a tape supply device such as a DAT (DAT) or a video tape recorder (VTR).

[Prior Art] Fig. 3 is a perspective view schematically showing a conventional reel stand control device. 3 is a reel disk, 3 is a spindle, 5b is a tape tension detection arm, 6 is a tape tension detection post, 7 and 8 are tape guide posts, 9 is a band brake, and 10 is a balance spring.

Conventionally, the reel stand control device has controlled the side surface of the reel disk l using a hand brake 9, as shown in FIG. This band brake 9 is made by pasting felt 9a etc. on metal foil, and one end of the hand brake 9 is rotatably attached to the mounting bracket 9C and the other end to the tape tension detection arm 5b. The band brake 9 was configured to be tightened by the balance spring lO of the tape tension detection arm 5b.

[Problems to be solved by the invention] However, in the conventional example described above, the friction characteristics change depending on the environment due to the water absorption of the felt attached to the band brake, and the rotational speed changes due to the change in the tape winding diameter of the reel disk. This has the drawback that the slip characteristics change. In addition, the band brake is thin and lacks rigidity, requires a guide to prevent it from coming off in the width direction of the band, requires careful handling, has a large number of parts, and is expensive.

The present invention has been made to solve such problems, and is a reel stand control device that can always perform stable reel stand control without being affected by changes in the environment or changes in the winding diameter of the reel disk. = [Means for Solving the Problem] In order to achieve the above object, the reel stand control device of the present invention arranges a torsion coil spring on the outer peripheral surface of the reel disk, and One end is locked to the stopper, and the other end is locked to the mounting part of the tape tension detection post or the tape tension detection arm part, and when the tape tension is weak, the torsion coil spring tightens the reel disc, and when the tape tension is strong, the torsion coil spring tightens the reel disc. The structure is such that it moves in the direction of loosening.

[Effect]

According to the present invention, the coil inner diameter part of the torsion coil spring is arranged so as to be in contact with the outer peripheral surface of the resin reel disk, and the spring arm of the torsion coil spring is hung on the tape tension detection part, and when the tape tension is weaker than a predetermined tape tension, the coil part is I tried to tighten the reel disc, and loosen it when it was strong.

[Embodiment] FIG. 1 is a perspective view schematically showing a reel stand control device according to an embodiment of the present invention, and the same reference numerals as in FIG. 3 indicate the same or corresponding parts.

In FIG. 1, numeral 1 is a reel disk, on the outer peripheral surface of which one end 2a of a torsion coil spring 2 is hooked on a stopper 4, and the other end arm 2b of the coil spring 2 is hooked on a tape tension detection post 6. When the tape tension becomes smaller than a predetermined value, the tape tension detection arm 5 acts in the direction of tightening the torsion coil spring 2 using the fixed part 5a as a fulcrum, increasing the frictional force with the reel disk l and increasing the tape tension. . Further, when the tape tension is high, the torsion coil spring 2 is in the loosening direction, so the tape tension becomes small.

Moreover, FIGS. 2(a), 2(b), and 2(C) are cross-sectional views showing the cross-sectional shapes of the wires of the torsion coil spring 2, respectively.

Figure 2 (a) shows a general wire rod, but in order to increase the contact area, we use a square wire rod as shown in Figure 2 (b) or a rectangular wire rod as shown in Figure 2 (c) to improve the friction properties. The aim is to improve

Although FIG. 1 describes an example in which the tape tension detection post is arranged on the outer surface of the tape winding, it is of course possible to arrange the tape tension detection post on the inner surface of the tape winding.

[Effects of the Invention] As explained above, the sliding clutch of the reel stand using the torsion coil spring of the present invention has constant friction characteristics against environmental changes, and the torsion coil spring itself also serves as a balance for the tape tension detection arm. Therefore, there is no need for a band brake attached with felt, etc., so the number of parts is small, and the torque control of the reel stand can be performed with good characteristics without increasing manufacturing costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing a reel stand control device according to an embodiment of the present invention, and FIGS. 2(a) and (b). (C) is a cross-sectional view showing the cross-sectional shape of the wire of the torsion coil spring 2, and FIG. 3 is a perspective view schematically showing a conventional reel stand control device. In the figure.

Claims (1)

[Claims] In a reel stand control device that controls a reel stand on the supply side of a tape-shaped medium, a torsion coil spring is arranged on the outer circumferential surface of the reel disk, one end of this torsion coil spring is used as a stopper, and the other end is used as the attachment part of the tape tension detection post or the tape. A reel stand control characterized by a configuration in which a torsion coil spring is locked to a tension detection arm and operates in a direction to tighten the reel disk when the tape tension is weak, and in a direction to loosen the reel disk when the tape tension is strong. Device.