JPH0564909U - Automatic tape running height adjustment device for tape recorders - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Automatic tape running height adjustment device for tape recorders to automatically detect and adjust the running height of the tape to keep it at an optimum height. I will provide a. [Structure] Detecting a displacement of a traveling tape height to obtain a displacement voltage, comparing the displacement voltage with a reference voltage and outputting a differential voltage, and a driving unit driven by a voltage applied from the sensing unit. And an inclined pole for adjusting the inclination by the actuator to move the tape slightly up and down.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an automatic tape traveling height adjusting device for a tape recorder, which can automatically adjust the height of a tape traveling guided by a drum to a preset tape traveling height.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, as shown in FIG. 1, a device for guiding a tape to a drum when the tape is running has pole bases 3 on both sides of a drum 2 which is installed on a main plate 1 at a predetermined angle. A guide roller 5 for guiding the tape 4 to the drum 2 side and an inclined pole 6 are provided on the pole base 3. The inclined pole 6 is provided at the same inclination angle as the drum 2, and guides the tape 4 to the entrance / exit side at the same inclination angle as the drum 2.

In such a conventional tape guide device, the tape running height is held by the flange 7 formed on the lower surface of the guide roller 5, and the lower end of the running tape 4 is supported by the flange 7. There is. However, when the tape is running, the running state of the tape is apt to be unstable due to an error in the operation of the mechanism and an error in the function control. Since it is pushed by the flange 7 of the drag roller 5, the film-shaped tape 4 may be damaged during running.

In order to solve such a problem, recently, a method of adjusting the running height of the tape by manually changing the height of the flange 7 of the guide roller 5 has been proposed. According to this, when adjusting the tape running height, it is necessary to separate the tape recorder cover and use another tool for adjustment. In addition, the manual adjustment work is difficult for an untrained person, and it takes a lot of time and labor.

An object of the present invention is to preset a normal running height of the tape, continuously detect a change in the actual running height, and automatically detect when the running height deviates from the normal running height. It is an object of the present invention to provide an automatic tape traveling height adjusting device for automatically adjusting the traveling height.

[0006]

[Means for Solving the Problems]

 The tape traveling height automatic adjusting device of the tape recorder of the present invention detects the upward and downward movement displacement of the tape from the preset tape traveling height, and outputs a detection signal according to the displacement. And an inclined pole that is provided on the pole base so as to guide the tape from the inlet / outlet side on the drum side and that can rotate at a predetermined angle, and the inclined pole that is driven by the detection signal output from the sensing means. It is characterized in that it is composed of an actuator for rotating at a predetermined angle.

[0007]

[Action]

 In such a tape traveling height adjusting device of the present invention, the sensing means continuously detects the displacement of the tape traveling height while the tape is traveling, and outputs a voltage corresponding to the displacement, which is the output voltage. To adjust the tilt of the tilt pole. Therefore, since the tension applied to the upper and lower edges of the tape guided by the inclined pole changes and the tape can move slightly upward or downward, the tape running height is automatically adjusted.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 shows a pole base 10 which employs the automatic tape height adjusting device of the present invention. As shown in the drawing, a pole base 10 is provided on the inlet side and the outlet side for guiding the tape 11 to the drum 12 side, and the pole base 10 is provided with a guide roller 13 and an inclined pole 14. .. The inclined pole 14 is arranged in the vicinity of the drum 12 at the same inclination angle as the drum 12, and guides the tape 11 at the same inclination angle as the drum 12.

An automatic tape running height adjusting device is provided on the pole bases 10 on both sides. As shown in FIGS. 3 and 6, the automatic tape traveling height adjusting device detects the displacement of the traveling tape 11 when the traveling tape 11 slightly moves up and down, and outputs a voltage corresponding to the displacement. The base 10 includes a tilt pole 14 rotatably provided at a predetermined angle, and actuators 15a and 15b for adjusting the tilt of the tilt pole 14 by receiving a voltage from the sensing means.

The sensing means includes a light emitting sensor and a light receiving sensor for detecting the upward and downward movement displacement of the running tape. The first and second luminescence sensors 16 and 17 are located outside the tape 11 guided toward the guide roller 13 and the inclined pole 14 and are provided in the holder 18 on the main base 21. The tapes are arranged at the positions corresponding to the set upper and lower limits of the tape running height. The first and second light receiving sensors 19 and 20 are provided on the holder 22 so as to face the light emitting sensor with the tape 11 interposed therebetween, and the first and second light receiving sensors 19 and 20 are provided. The light beams from 16 and 17 will be received. The amount of vertical displacement of the tape detected by these sensors is output as a displacement voltage by the light receiving sensor.

The sensing means also includes first and second differential amplifiers 23, 24 electrically connected to the first and second light receiving sensors 19, 20. The first and second differential amplifiers 23 and 24 compare the displacement voltage applied from the first and second light receiving sensors 19 and 20 with a preset reference input voltage and output a difference voltage.

As shown in FIGS. 7 and 8, the tilt pole 14 is provided on the pole base 10 so as to be rotatable at a predetermined angle. A shaft 26 of the pedal 25 is horizontally provided on the pole base 10, and a bearing 27 is arranged between the pole base 10 and the shaft 26 to enable the pedal 25 to rotate. The pedal 25 is provided with the inclined pole 14 in a vertical direction with a predetermined inclination, and the lower end of the inclined pole 14 is provided so as to penetrate the pedal 25 and is rotatable about a shaft 26 of the pedal 25. It is in a state.

The actuators 15 a and 15 b receive the difference voltage from the first and second differential amplifiers 23 and 24 of the sensing means and adjust the inclination of the inclined pole 14, and the lower ends of the inclined pole 14 are controlled by the actuators 15 a and 15 b. It is provided. That is, the first and second terminal pieces 28 and 29 electrically connected to the first and second differential amplifiers 23 and 24 are fixed to the pole base 10, and the tips thereof are located on both sides of the lower end of the inclined pole 14. It is provided. Between the inclined poles 14, first and second actuators 15a and 15b driven by a drive current applied to the first and second terminal pieces 28 and 29 are provided. As the first and second actuators 15a and 15b, it is desirable to use elements such as piezoelectric elements that can contract or expand rapidly by an applied voltage.

Next, the operation of the device of the present invention will be described in detail.

As shown in FIG. 3, when the tape 11 runs at a preset running height, only a part of the light beams projected from the first and second light emitting sensors 16 and 17 is received by the light receiving sensor 19. , 20 and the rest is blocked by tape. Therefore, the first and second light receiving sensors 19 and 20 apply the displacement voltage corresponding to the amount of received light to the first and second differential amplifiers 23 and 24, and the first and second differential amplifiers 23 , 24 compares the applied voltage with a reference input voltage and supplies the difference voltage to the first and second actuators 15a, 15b. If there is no voltage difference, it means that the tape 11 is running at the normal height, and it is not necessary to adjust the height of the tape. Therefore, when the tape 11 travels at a normal height, the displacement voltage applied to the first and second differential amplifiers 23 and 24 and the reference input voltage should be matched to each other. Since the differential amplifiers 23 and 24 of FIG. 6 do not output a differential voltage to the first and second actuators 15a and 15b during normal running of the tape, the tilted pole 14 has a tilt (θ) as shown in FIG. It will be kept as it is.

Next, as shown in FIG. 4, when the tape 11 moves downward during traveling and deviates from the preset traveling height, the amount of light received by the first light receiving sensor 17 increases, so that the first The displacement voltage applied to the differential amplifier 23 becomes high. Further, since the amount of light received by the second light receiving sensor 20 is cut off by the tape 11 and reduced, the displacement voltage applied to the second differential amplifier 24 becomes low. Therefore, the first differential amplifier 23 compares the increased displacement voltage with the reference input voltage, and supplies the positive (+) voltage corresponding to the increased difference voltage to the first actuator 15a. The differential amplifier 24 compares the lowered displacement voltage with the reference input voltage and supplies a negative (-) voltage corresponding to the reduced difference voltage to the second actuator 15b. When the positive voltage and the negative voltage are applied to the first and second actuators 15a and 15b in this way, the first and second actuators 15a and 15b move in a certain direction based on the applied positive voltage and the negative voltage. Bending. At this time, when the bending direction is set to the direction in which the tilt pole 14 rotates clockwise around the shaft 26 of the pedal 25, the tilt (θ) of the tilt pole 14 becomes small as indicated by a virtual line a in FIG. Become. Therefore, the tape 11 guided to the inclined pole 14 has a larger tension applied to its lower end than its upper end, and therefore the tape 11 slightly moves to the upper side where the tension is small.

As shown in FIG. 5, when the tape 11 moves upward during traveling and deviates from the predetermined traveling height, the amount of light received by the first light receiving sensor 19 is blocked by the tape 11 and decreases. Therefore, the displacement voltage applied to the first differential amplifier 23 becomes low. Further, the amount of light received by the second light receiving sensor 20 increases, and thus the displacement voltage applied to the second differential amplifier 24 increases.

Therefore, the first differential amplifier 23 compares the lowered displacement voltage with the reference voltage, amplifies the negative (−) voltage corresponding to the reduced difference voltage, and applies the negative voltage to the first actuator 15a. Therefore, the second differential amplifier 24 compares the increased displacement voltage with the reference voltage, amplifies the positive (+) voltage corresponding to the increased differential voltage, and applies the amplified positive voltage to the second actuator 15b. Will be done. Thus, when the positive voltage and the negative voltage are applied to the first and second actuators 15a and 15b, the first and second actuators 15a and 15b are bent in the direction opposite to the above direction. Therefore, the tilted pole 14 rotates counterclockwise around the shaft 26 of the pedal 25, and the tilt (θ) of the tilted pole 14 increases as indicated by a virtual line b in FIG. 9.

For this reason, since tension is greater at the upper end than at the lower end of the tape 11 guided by the inclined pole 14, the tape 11 is slightly moved to the side where the tension is small and the tape running height is adjusted downward. It is a thing.

Since the running height adjusting operation as described above is continuously performed, the tape running height can be adjusted to the preset running height so that the tape runs normally. Become.

[0022]

[Effect of the device]

 As described above, according to the tape traveling height automatic adjusting device of the present invention, the traveling height of the tape is automatically adjusted to the preset normal traveling height while the tape is traveling, so that it does not depend on any manual operation. In addition, the running height of the tape can be kept constant and damage to the tape due to changes in the running height can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing a state where a tape is guided to a drum by a conventional tape guide device.

FIG. 2 is a plan view of a main part of a deck showing a pole base provided with an automatic tape traveling height adjusting device of the present invention.

FIG. 3 is an explanatory diagram showing a state in which a sensing unit detects a movement displacement when the tape runs at a normal height.

FIG. 4 is an explanatory diagram showing a state in which the sensing means detects a displacement when the tape slightly moves downward.

FIG. 5 is an explanatory diagram showing a state in which the sensing means detects a displacement when the tape slightly moves upward.

FIG. 6 is a block diagram showing the operation of the tape traveling height automatic adjusting device of the present invention.

FIG. 7 is a front view of the pole base showing the installation structure of the inclined pole in the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is an explanatory view showing a state in which the tape slightly moves up and down by the inclined pole in the present invention.

[Explanation of symbols]

 10 Pole Base 11 Tape 14 Inclined Pole 15a, 15b Actuator 16, 17 Light Emitting Sensor 19, 20 Light Receiving Sensor 23, 24 Differential Amplifier

Claims (2)

[Scope of utility model registration request] 1. A sensing means for detecting an upward / downward movement displacement of the tape from a preset tape traveling height and outputting a detection signal according to the displacement, and guiding the tape from an inlet / outlet side of the drum side. As described above, the tilt base is provided on the pole base and can rotate at a predetermined angle, and the actuator that is driven according to the detection signal output from the sensing means to rotate the tilt pole at a predetermined angle. Automatic tape running height adjustment device for the featured tape recorder. 2. The first sensing means is provided on a horizontal line which coincides with upper and lower ends of a preset tape running height.
The first and second light emitting sensors are provided at positions opposite to each other with the tape sandwiched between the first and second light emitting sensors and output a displacement voltage according to the upward and downward movement displacement of the tape. 2. The light receiving sensor according to claim 2, further comprising: a differential amplifier that compares the displacement voltage applied from the first and second light receiving sensors with a reference input voltage and amplifies and outputs the difference voltage. Automatic tape height adjustment device for tape recorders.