JPS60195754A - Tape recorder - Google Patents

Abstract

PURPOSE:To shorten the time required for making rewinding and quick traverse operations and, at the same time, to prevent cut-off of a tape, by detecting a previously set rotational frequency ratio by means of number of revolution detectors connected with a feeding shaft and winding shaft. CONSTITUTION:When the ratio between numbers of revolution detected by revolution detectors 5 and 7 connected to a winding reel 1 and feed reel 2 becomes one in the vicinity of a previously set ratio of a tape end, a motor power supply controlling section 8 drops the voltage of a power source 6. Therefore, the rewinding speed and quick traverse speed are reduced when a tape reaches the vicinity of its end. As a result, tape cut-off is prevented and the tape can be wound to a desired position quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Minute Hand Using the Invention] The present invention relates to a rewinding and fast forwarding mechanism for a cassette tape recorder.

[Background of the invention]

Conventionally, cassette tape recorders perform rewinding and fast forwarding at such a speed that the cassette tape does not break even when the end of the tape is reached. Therefore, for example, C-
It usually takes 60 seconds to 120 seconds for a tape of about 60 mm.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape recorder that can solve the problem of long rewind and fast forward times, which is a disadvantage of tape recorders.

[Summary of the invention]

In the present invention, a high voltage is applied to the take-up motor during FF and REW, and the winding is performed at a higher speed than usual.

When approaching the end of the tape, the motor voltage is returned to normal, and the speed is returned to a speed that does not cut the tape even at the end of the tape.

[Embodiments of the invention]

The figure shows a tape recorder in which the tape is fast-forwarded and wound from a feed reel 2 onto a take-up reel 1.

A rotation speed detector 5.7 is connected to the take-up reel 1 and the feed reel 2, and a motor power control section 8 is manually operated. The motor 4 rotates at high speed during normal operation. However, at the tape end, in the case of a cassette, considerable tension acts on the tape, cutting or damaging the tape, so it is necessary to reduce the winding speed.

In the present invention, the rotation speed is detected by the rotation speed detector 5.7, and when the rotation speed ratio reaches a preset ratio near the tape end, the motor voltage control section 8 controls the motor voltage Wjfi6! Reduce pressure. In the case of a compact cassette, the take-up reel is approximately 50φ at the tape end.
Since the feed reel (empty reel) has a diameter of 21φ, the rotation speed ratio on the feed reel side is 50/21 times faster than on the take-up side, so that the end of the tape is detected.

〔Effect of the invention〕

According to the present invention, the tape winding speed can be varied depending on the tape winding position, and the tape can be quickly wound to a desired position without damaging the tape.

[Brief explanation of drawings]

The figure is a block diagram of a tape recorder according to an embodiment of the present invention. 1... Take-up reel, 2... Feed reel, 5...
... Winding gear, 4... Motor, 5... Rotation speed detector, 6... Motor power supply, 8... Motor power supply control section. Representative Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. In a cassette tape recorder equipped with rotation speed detection mechanisms on both the feed shaft and take-up shaft, both rotation speed detection mechanisms detect the tape end by detecting a preset rotation speed ratio. A tape recorder is characterized in that the cassette tape is prevented from being cut by detecting the cassette tape and reducing the rewinding and fast forwarding speeds when the tape reaches the vicinity of the end.