JPS5877050A - Tape recorder - Google Patents

Abstract

PURPOSE:To simplify the operation of a tape recorder, by reversing the direction of a tape on the basis of the center position of an operating element and then starting the tape recorder when the operating element of a driving device which increases the tape travelling speed in response to the degree of operation from the center position exceeds the center position. CONSTITUTION:The voltage +B is applied to the middle point of a variable resistance VR1, and both ends of the VR1 are grounded. An operating element is connected to the base of a TR via a resistance R1. Thus the emitter current is controlled and fed 3a to a driving controller 3. A variable resistor VR2 coupling to the VR1 is connected between the voltage +B and an earth, and the middle point of the VR2 is fed to the plus terminal of a comparator 4 in the form of the reference voltage. Then the operating element is connected to a terminal of the comparator 4, and a signal 1 or 0 is delivered in accordance with the position of the operating element to control 3b the driving. At the same time, the change of the signal 1 or 0 is differentiated 5 to perform the driving control 3c. As a result, the pulses are fed 3c when the operating element exceeds the center position, and the turning direction is decided by the signal 3b. The signal 3a controls the speed. Thus a desired recording position of audio signals can be obtained with just a single operation. This operation is suited to the editing work.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape recorder, in which a tape is run in a desired direction and at a desired speed by simple operation of a position search operator for searching for a desired audio signal recording position. To provide a tape recorder which can prevent sudden strong tension from being applied to the tape.

Conventionally, in order to perform editing such as searching for a desired audio signal recording position on a tape and continuously recording p different audio signals from that position, the tape is played back while playing back the audio signal f′ recorded on the tape. There is a tape recorder that has a position search function that searches for a desired audio signal recording weight position by changing the tape running speed in the forward and reverse directions. However, in this conventional tape recorder, a switch for starting the position search operation and a control lever for instructing the running direction and speed of the tape are provided separately. Depending on the position of the lever, the tape may start to run in the opposite direction to the intended direction, or if the tape is suddenly run at high speed, a strong tension is suddenly applied to the tape.

The present invention eliminates the above-mentioned drawbacks, and one embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a circuit diagram of an embodiment of a tape recorder according to the present invention. In the figure, 1 is a power supply terminal to which a power supply voltage of 10B is supplied, the center tap of the center-tapped variable resistor ■, and the terminal VR of the center-tapped variable resistor VR2.
Variable resistors VR1 and VB2 with one center tuff, which are connected to the collectors of transistors Tr and 2a, are interlocked with each other, and when the operating lever 2 on the front panel is in position O as shown in FIG. # The VB2 slider has a recess at each center tap position, and the operation lever 2
is the position.

As the slider moves further toward position F, the slider slides toward the terminals VR1a# and VR2a of variable resistors vR1# and VB2, respectively, and the operating lever 2 moves from position 11o to position R.
As the slider moves in the direction, the slider moves toward the terminal VR1b.

It slides and moves toward the vR2b side. variable resistance V
The terminals VR1a*vRll of R1 are both grounded, and the slider of the variable resistor VR1 is connected to the pace of the transistor Tr via the resistor R1. The emitter of the transistor Tr is grounded via a resistor R2 and connected to a terminal 3a of the drive control device 3 via a resistor R3.

Therefore, when the operating lever 2 is at the position oVc, a voltage (10 B) is applied to the transistor Tr, and the flow of the ivy 112 becomes maximum, and this is converted into voltage by the resistor R5 to the terminal of the drive control device 3. The voltage of 3a becomes maximum. When the operation lever (-2) moves from position 0 toward position F or position tR, the voltage applied to the pace of transistor Tr decreases as it moves, and therefore the voltage at terminal 3a and the position of operation lever 2 decrease. The relationship with the position is as shown in FIG.

Also, the terminal VR2bfi of the variable resistor VR2 is grounded 1, whose terminal VR2a is connected to the power supply terminal 1, and its slider is connected to the inverting input terminal of the resistor, and the operational amplifier 4 is connected via the center tap resistor R5.
Connected to the non-inverting and inverting input terminals. The output terminal of the operational amplifier 4 is connected to the non-inverting input terminal via a resistor R6.
As a result, the reference voltage (+B/2) is supplied to the non-inverting input terminal of the operational amplifier 4, which in turn is supplied to the inverting input terminal! It constitutes a comparator that compares pressure. Therefore, the output signal of the operational amplifier 4 is at the operating lever 2 position. to position F, and when a voltage higher than the reference voltage (B/2) is applied to the inverting input terminal of operational amplifier 4, the level is low; when the operating lever 2 is between position 0 and position R, it is low level. The output signal of the operational amplifier 4 is supplied to the terminal 3b of the drive control device 3 and is also supplied to the differentiating circuit 5, where the differential
When the output signal changes from a high level to a low level (or from a low level to a high level), it is converted into a positive polarity (or negative polarity) pulse and is supplied to the terminal 30 of the drive control device 3.

The drive control device 3 is supplied with a pulse of positive polarity (or negative polarity) to the terminal 3c, and then the output signal of the operational amplifier 4 is supplied to the terminal 3b! determines whether it is a low level or a high-repection, and if it is low level, a suitable drive voltage is supplied to the take-up-reel motor 6 to run the tape, and the supply side reel motor T is connected to the terminal 3I! A drive voltage proportional to the voltage supplied to L is supplied to apply pack tension to the tape, and as the operating lever 2 moves from position 0 to position F, the tape running speed gradually increases from approximately zero to high speed. is run in the forward direction (the direction in which the take-up reel winds the tape). Also, a pulse is supplied to the terminal 3c and the terminal 3b
is at a high level, the drive control device supplies a constant drive voltage to the supply reel motor T to run the tape, and supplies a drive voltage proportional to the voltage supplied to the terminal 3a to the take-up reel motor 6. The tape is supplied to apply back tension to the tape, and as described above, the tape is run in the opposite direction so that as the operating lever 2 approaches the position, the tape running speed gradually increases from approximately zero.

In addition, when running the tape above, the tape is attached to the capstan,
It is not pressed between pinch rollers (not shown).

This operation allows the tape to move to the center of the -2 gas interval (section from position F to position R1) and after a pulse is output from the differentiator circuit 5. made to do,
Since the running speed gradually increases from approximately zero, the tape can be run in a desired direction from the beginning with a simple operation, and strong tension is not applied to the tape suddenly. 'The drive control device 3 may determine the tape running direction depending on whether the pulse from the differentiating circuit 5 has positive or negative polarity, and may also apply a constant drive voltage to the side noreel motor that applies back tension. A drive voltage corresponding to the voltage at the terminal 3a is supplied to the reel motor on the side that winds the tape so that the drive voltage is minimum when the voltage at the terminal 3a is maximum and maximum when the voltage at the terminal 3a is minimum. However, the present invention is not limited to the above embodiments.

Note that instead of a comparator consisting of a variable resistor VR2 and an operational amplifier 4, it is opened when the operating lever 2 is between position 0 and position A, and is at a low level, and is biased by the operating lever 2 when it is between position 0 and position A. A switch may be provided at position O that closes at t and outputs a high-level signal, and instead of the differentiating circuit 50, when the operating lever 2 passes through position 0, it is energized by the operating lever 2 and becomes conductive. The present invention is not limited to the above-mentioned embodiment; a switch that generates a pulse may be provided at position 0, and a signal from this switch may be supplied to the terminal 3c.

゛As described above, the tape recorder of the present invention includes a pair of reel motors that drive the take-up reel and a supply reel to rotate the tape, and a pair of reel motors that run the tape by rotating the take-up reel and the supply reel, and a pair of reel motors that rotate the tape when the operator is operated from the center position to the pair. in the forward direction and in the other direction.
a drive device that drives a pair of linear motors to run the tape in the opposite direction when the operator is operated beyond the center position, and to increase the tape running speed according to the amount of operation from the center position of the operator; Since it consists of a switch device that turns the drive device into an operating state when the desired audio signal recording position is reached, the desired direction can be set without waste from the beginning with extremely simple operation by operating the position search operator to search for the desired audio signal recording position. The tape can be run slowly, and the running speed of the tape gradually increases according to the amount of operation of the operator.It has the advantage that strong tension is not suddenly applied to the tape.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the tape recorder according to the present invention, FIG. 2 is a diagram showing an embodiment of the operation lever on the front panel of the tape recorder according to the present invention, and FIG. FIG. 3 is a diagram showing the relationship between the voltage at the terminal 3a and the position of the operating lever. DESCRIPTION OF SYMBOLS 1...Power terminal, 2...Operation lever, 3...Drive control circuit, 4...Operation amplifier, 5...Differential circuit, 6
．． 7...Motor, R1-R6...Resistance, VRl#
VB2...variable resistance.

Claims (1)

[Claims] (11) A pair of reel motors that rotate a take-up reel and a supply reel to run the tape, and when an operator is operated in one direction from the center position, the tape is moved in the forward direction. fart,
a drive device that drives each of the pair of linear motors so as to cause the tape to travel in the opposite direction when the operator is operated in the other direction, and to increase the tape running speed in accordance with the amount of operation of the operator from the center position; A tape recorder comprising a switch device that puts the drive device into operation when the operator is operated beyond the center position. (2) The switch device includes a variable resistor whose slider slides in conjunction with the operator and a constant voltage is applied to both ends; a comparator circuit that compares the voltage drawn from the slider when the slider is in the position with a reference voltage equal to the voltage, and a circuit that generates a signal that sets the drive device to an operating state when the output voltage of the comparator circuit changes. A tape recorder according to claim 1, characterized in that the tape recorder comprises: (3) The switch device is disposed corresponding to the center position, and when the operator is operated beyond the center position, the switch device is energized to activate the drive device. 2. The tape recorder according to claim 1, wherein the tape recorder generates a signal for activating the tape recorder.