Clutch device for magnetic recording/reproducing apparatus

Abstract

A clutch device for a magnetic recording / reproducing apparatus for transmitting power for a tape conveying regardless of the quantity of tape wound around a reel, including a rotating central shaft installed on a main chassis, a drive pulley connected to the rotating central shaft, and having a cylindrical pulley holder portion, said drive pulley being rotated by receiving power from a driving source, an up / down gear having a cylindrical gear holder unit with the outer diameter thereof being smaller than the inner diameter of the pulley holder portion and ascendable / descendable along the rotatable central shaft, and a clutch spring placed between the inner surface of the pulley holder portion and the outer surface of the gear holder unit for selectively transmitting power with a certain torque from the driving pulley to the up / down gear in accordance with the rotational direction of the driving pulley.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a magnetic recording / reproducing apparatus, and in particular to a clutch device for a magnetic recording / reproducing apparatus which is capable of transmitting power for regularly conveying a tape, regardless of the quantity of the tape, wound around a reel.[0003]2. Description of the Prior Art[0004]FIG. 1 illustrates a tape path conveying structure of a general magnetic recording / reproducing apparatus.[0005]As shown in FIG. 1, a supplying reel driving body 1 and a winding reel driving body 21 are installed to drive a supplying reel (not shown) and a winding reel (not shown) of a tape cassette (not shown) at one side of a main chassis (C).[0006]A plurality of posts and guide rollers are provided on the main chassis (C) to guide the path of a tape (T) released from a tape cassette.[0007]A tension post 3 for controlling the tensile force of the travelling tape (T) is installed on a tensio...

AI Technical Summary

Benefits of technology

The present invention provides a clutch device for a magnetic recording / reproducing apparatus that can reduce production cost and improve assembly operation efficiency by minimizing the number of components. The clutch device includes a driving pulley, an up / down gear, and a clutch spring. The clutch spring is placed between the inner surface of the pulley holder and the outer surface of the gear holder unit, and can selectively transmit power with a certain torque from the driving pulley to the up / down gear in accordance with the rotational direction of the driving pulley. The clutch device also includes a gear holder unit with an inner cylindrical portion and an outer cylindrical portion, and an engaging rib for rotating together with the up / down gear. The clutch spring has a coil spring structure, with the end of the clutch spring contacting the inner surface of the pulley holder and the other end of the clutch spring contacting the outer surface of the gear holder unit. The gear holder unit includes an inner cylindrical portion and an outer cylindrical portion, and the clutch spring contacts the inner cylindrical portion. The clutch device can reduce production cost and improve assembly operation efficiency by minimizing the number of components.

Problems solved by technology

However, the above-mentioned conventional magnetic recording / reproducing apparatus has the following problems.

In this use of clutch springs 18, 18′, production costs are increased due to the large amount of construction parts.

In addition, the operation efficiency of the assembly process is reduced.

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