JPS62157360A - Tape guide device - Google Patents

Abstract

PURPOSE:To prevent a tape from coming into contact with a tape guide periphery by controlling the drive of a pump supplying air to a tape guide in accordance with tape tension at a tape winding side. CONSTITUTION:A tension detection means 26 installed on the tape winding side T detects the tension of the tape 11 at the winding side T. The tension appears as the changing amount of a potentiometer 30 when it increases, and is transmitted to a motor drive circuit 32. It boosts the drive voltage of a power source 33 supplied to a motor 25 to increase the drive of a pump 24, whereby the pressure and flow of the air supplied to tape guides 5 and 6 are increased. Thus an air layer between the tape 11 and the peripheries 5a and 6a of the tape guides 5 and 6 can be maintained, whereby the contact of the tape 11 with the peripheries 5a and 6a can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is most suitable for application to a tape guide device of a video tape recorder, for example. The present invention relates to a tape guide device that allows the tape to run.

[Summary of the invention]

The present invention supplies air to the tape guide using a pump driven by a motor, and blows this air out from the circumferential surface of the tape guide to float the tape wound around the circumferential surface of the tape guide. In a tape guide device such as a video tape recorder configured to run with
The tape tension is increased by detecting the tension of the tape on the tape winding side with respect to the tape guide by a tension detection means, controlling the drive of the pump according to this tension, and controlling the supply of air to the tape guide. In this case, the tape floating from the circumferential surface of the tape guide can be prevented from coming into contact with the circumferential surface of the tape guide against the air.

[Conventional technology]

Traditionally, tape guide devices for video tape recorders and the like have been used to make air blow out from the circumferential surface of the tape guide so that the tape wound around the tape guide floats above the circumferential surface and travels. There is an air guide. With this air guide, the tape does not come into contact with the circumferential surface of the tape guide, so unlike a roller guide, there is less of the disadvantage that tape running is adversely affected by the inclination of the roller axis and the guide axis. There is also no disadvantage of increased friction due to contact with the peripheral surface of the

[Problem that the invention seeks to solve]

However, the above-mentioned air guide uses air ejected from the circumferential surface of the tape guide to form an air layer (air film) between the circumferential surface and the tape, thereby causing the tape to float above the circumferential surface of the tape guide. Therefore, when the tape tension increases, if air is ejected from the circumferential surface of the tape guide at a constant pressure, the tape gradually approaches the circumferential surface of the tape guide due to the tape tension, creating an air layer. becomes thinner.

In the worst case, the tape may come into contact with the circumferential surface of the tape guide, and the friction at this time further increases the tension of the tape.

Therefore, in the present invention, when the tension of the tape increases,
This is to prevent the tape floating from the circumferential surface of the tape guide from coming into contact with the circumferential surface of the tape guide against the air.

[Means for solving problems]

The present invention provides a tension detection means for detecting the tension of the tape on the tape winding side relative to the tape guide, and drives a pump for supplying air to the tape guide in accordance with the tape tension on the tape winding side. The pump is configured to control the drive of the pump by controlling the drive voltage of the motor, thereby controlling the supply of air to the tape guide.

[Effect]

In the present invention, the tension of the tape on the tape winding side with respect to the tape guide is detected by the tension detection means. When the tension of the tape increases, the driving voltage of the motor is increased in accordance with this tension. This increases the drive of the pump, increasing the pressure and flow rate of air supplied to the tape guide. As a result, an air layer is maintained between the tape and the circumferential surface of the tape guide, and the tape can be prevented from coming into contact with the circumferential surface of the tape guide.

〔Example〕

An embodiment in which the present invention is applied to a tape guide device for a video tape recorder will be described below with reference to FIGS. 1 and 2.

First, in FIG. 2, a pair of tape guide blocks 1.
2, each pair of tape guides 3.4 and 5.6 is arranged. Both tape guide blocks 1.2 are guided by a pair of guide rails (not shown) on both sides of the rotary head drum 7, and are configured to be moved from a backward movement position in the tape cassette 8 to a forward movement position as shown. has been done. And a supply reel 9 stored in the tape cassette 8
The tape 11 wound around the winding wheel 10 is pulled out by each tape guide 3.4 and 5.6, and the tape 11 is wound around the circumferential surface 7a of the rotary head drum 7 in a spiral pattern, and the winding of nearly 360° is at an angle. It is wound almost in an Ω shape. In addition, each tape guide 3
．． 4 and 5.6 are inclined at a predetermined angle with respect to the rotary head drum 7, so that the tape 11 is wound along the tape lead 12 of the rotary head drum 7.

While the rotary head drum 7 is rotated at high speed in the direction of the arrow a, the tape 11 is run at a constant speed in the direction of the arrow a, and desired recording or reproduction is performed by the rotation of the rotary head drum 7. In addition, 13 is a plurality of tape guides on the tape supply side S, 14 is a plurality of tape guides on the tape winding side T, 15 is a tape on the tape supply side S, 11 is a well-known tension bin with a tension arm, 16 is a pinch roller, 17 is the capstan.

Next, each tape guide 3.4 and 5.6 on both tape guide blocks 1.2 is constituted by a so-called air guide. That is, the peripheral surfaces 3as4az and 5a of each tape guide 3.4 and 5.6.

6a is provided with a plurality of small holes 18 in a line along its vertical longitudinal direction. And these plural small holes 18
open into air inlets 19 formed in both tape guide blocks 1.2. Note that both tape guide blocks 1.
2 is brought into close contact with a pair of air supply blocks 20.21 when positioned in the forward movement position shown in the figure, whereby air intake ports 19 are formed in both air supply blocks 20.21. connected to. Both air supply blocks 20, 21 are connected to a pump 24 by a connecting pipe 23, such as a tube, and this pump 24 is driven by a motor 25.

A pump 24 is driven by a motor 25, and each tape guide 3.4 and 5.6 is driven by this pump 24.
air is supplied to. This air flows through each tape guide 3.4.
and 5.6 are ejected from the plurality of small holes 18, thereby forming an air layer between the circumferential surfaces 3a, 4a, 5a, 6a and the tape 11, and the tape 11 is ejected from the circumferential surfaces 3a, 4a, 5a, 5a, It floats up from 6a and travels with reduced friction.

Next, in this embodiment, as shown in FIG. 1 and FIG. A tension detection means 26 for detecting the tension of the slave 11 is provided on the downstream side. This tension detecting means 26 has a tension bin 28 installed at the tip of a tension arm 27.
The rotating shaft 29 of 7 is connected to a potentiometer 30. Note that 31 is a return spring for the tension arm 27. As shown in FIG. 1, the potentiometer 30 is connected to a motor drive circuit 32, which in turn is connected to the motor 25. Note that 33 is a power supply that is controlled by the motor drive circuit and supplied to the motor 25. The motor drive circuit 32 also includes a display circuit 34.
is connected.

In the embodiment described above, when the tape 11 is run in the direction indicated by the arrow, the tension of the tape 11 is detected by the tension bin 15 arranged on the tape supply side S, and the tension of the tape 11 on the tape supply side S is constant. is adjusted to However, the tape 11 is connected to multiple tape guides 1.
3 and the rotating head drum 7 are in contact with these parts, so if the coefficient of friction increases due to differences in the type of tape 11 or the frequency of use, even if the tension of the tape 11 on the tape supply side S is constant, the tape At the winding side T, the tension of the tape 11 increases.

Then, the tension detection means 26 provided on the tape winding side T detects the tension of the tape 11 on the tape winding side T. When the tension increases, a change appears on the potentiometer 30 and is transmitted to the motor drive circuit 32. Then, the motor drive circuit 32 connects the power supply 33 to the motor 25.
The drive voltage supplied to the drive voltage is controlled to be increased.

This increases the drive of the pump 24, increasing the pressure and flow rate of air supplied to each tape guide 3.4 and 5.6. As a result, an air layer is maintained between the tape 11 and the circumferential surfaces 3a, 4a and 5a, 6a of each tape guide 3.4 and 5.6, and the tape 11 comes into contact with the circumferential surfaces 3a, 4a and 5a, 6a. This will prevent you from doing so. Furthermore, if there is any abnormality such as a failure in the pump 24, the amount of air supplied by the pump 24 to each tape guide 3.4 and 5.6 will decrease even under normal conditions, and the tape 11 on the tape winding side T will be Tension will increase. In this case as well, the tension detection means 26 detects the tension of the tape 11 in the same manner as described above, and attempts to increase the amount of air supplied from the pump 24, but due to an abnormality in the pump 24, the amount of air supplied does not change. The tension of the tape 11 also remains unchanged.

This makes it clear whether the pump 24 is malfunctioning or the like. In this case, the display circuit 34 operates an alarm, an indicator, etc. to notify of the tension abnormality. That is, by detecting the tension of the tape 11 on the tape winding side T, each tape guide 3.4 and 5.
It is possible to manage the flow rate, pressure, etc. of air supplied to 6.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, a tension pin and a potentiometer are used as the tension detection means, but this may also be done by detecting current consumption of a capstan. Further, in the embodiment, the tape guides at the entrance and exit of the tape to the rotary head drum have been described, but these may be tape guides at each part of the tape running path.

Note that the present invention is not limited to tape guide devices for video tape recorders, but can be widely applied to tape guide devices for various information processing devices.

〔Effect of the invention〕

According to the present invention, when the tension of the tape increases, it is possible to prevent the running tape floating from the circumferential surface of the tape guide from coming into contact with the circumferential surface of the tape guide against the air. This can prevent the tape tension from increasing further. Therefore, the influence of the tape tension in the so-called air guide can be eliminated, and the running of the tape can be made extremely stable.

In addition, if the tension does not become normal even if the pump drive is controlled by tape tension detection, it becomes clear that there is an abnormality such as a failure in the pump, so the flow rate and pressure of air supplied from the pump to the tape guide etc., and can always supply the appropriate amount of air. Therefore, reliability and safety during use are significantly improved.

[Brief explanation of drawings]

The drawings show an embodiment in which the present invention is applied to a tape guide device for a video tape recorder. It is a perspective view showing an outline of a tape running system. In addition, in the symbols used in the drawings, 3.4.5.6----------11---Tape guides 3a, 4a, 5a, 6a----
Peripheral surface 11---
Tape 24−・−・−・−−−m−・・−・−−−−・
Pump 25・−・・・−・−・−・−・・−Motor 26−・−・−1−−−・−−−−−−−−・−Tension detection means 28・−・−− −−−−−−−−−1−−
−−・−・Tension pin 30−・−・−・−・−・−
−−−−・−・−・Potentiometer 32−−−−−−
−−−−−−−−−−−−−−・−Motor drive circuit 5
−−−−−・−・−・−・・−・−・−Tape supply side T
−−−−−−····−··−··−·−This is the tape winding side.

Claims (1)

[Claims] Air is supplied to the tape guide by a pump driven by a motor, and this air is ejected from the circumferential surface of the tape guide, causing the tape wound around the circumferential surface of the tape guide to float above the circumferential surface and travel. In the tape guide device configured as above, a tension detection means for detecting tape tension on the tape winding side with respect to the tape guide is provided, and the driving voltage of the motor is controlled according to the tape tension on the tape winding side. A tape guide device characterized in that the drive of the pump is controlled by controlling the supply of air to the tape guide.