JPS61175960A - Tape guide device - Google Patents

Abstract

PURPOSE:To constitute a titled device so that an air feed tube, etc. are not dragged, when moving forward and backward a tape guide block, by connecting an air receiving port to an air feed port of an air feed block and feeding air to a tape guide, when the tape guide block has been moved forward to a forward moving position. CONSTITUTION:An inclined surface 26 is formed on the front corner part of a tape guide block 2, and this inclined surface 26 is inclined in the direction (i) against the moving direction (h) of the time when the tape guide block 2 is moved forward to a forward moving position, and provided with an air receiv ing port 27. To the forward moving position of the tape guide block 2, namely, the tip part on a guide rail 11, an air feed block 43 is fixed so that the position can be adjusted by, for instance, a screw 44. On this air feed block 43, a positioning surface 45 is formed, an air feed port 46 of this positioning surface 45 is provided, and its positioning surface 45 is fixed so as to be inclined in the direction (i) in the same way as the inclined surface 26 of the tape guide block 2. Also, an air feed tube 47 from an air feed device is connected to the air feed block 43.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is most suitable for a tape guide device of a video tape recorder, for example, in which a tape is loaded onto a rotating head drum by a tape guide, and then the tape is loaded onto a rotating head drum. The present invention relates to a tape guide device that allows a tape to float and run from the circumferential surface of a tape guide.

[Summary of the invention]

The present invention relates to a tape guide device such as a video tape recorder, in which a tape is loaded onto a rotating head drum using a tape guide, and then the tape is floated from the circumferential surface of the tape guide to run. When the tape guide block is moved forward to the forward position, the air inlet provided in the tape guide block is connected to the air supply port formed in the air supply block provided at the forward position to supply air to the tape guide. By supplying air to the tape guide block, the air supply tube for supplying air to the tape guide is prevented from being dragged when the tape guide block is reciprocated.

[Conventional technology]

First, a conventional tape guide device for a video tape recorder will be explained with reference to FIG.

A pair of tape guide blocks 2 and 3, which are moved forward along both sides of the rotary head drum 1, pull out the tape 5 from within the tape cassette 4 installed at the cassette installation position, so that the tape 5 is pulled out around the circumference of the rotary head drum 1. It loads the surface 1a in a predetermined helical state with a wrapping angle of nearly 360° in an approximately Ω shape, and is constructed as follows.

Three tape guides are mounted on the pair of tape guide blocks 2.3 in a substantially triangular arrangement: a tape guide 7 consisting of an inclined guide and a pair of tape guides 8, 9 consisting of vertical guides. Next, the rotating hent drum l is arranged vertically, and a pair of guide rails 11, 12 for guiding both tape guide blocks 2 and 3, respectively, are arranged on both outer sides thereof. These guide rails 11 and 12 are formed by symmetrically arranging belt-shaped plates curved in an approximately J-shape along the circumferential surface 1a of the rotary head drum 1, and a guide groove 13 is formed along the center of these. each formed. Both tape guide blocks 2.3 are placed on both guide rails 11.12 with a pair of guide pins 14.15 fixedly spaced apart from their lower surfaces inserted into the guide grooves 13. It is placed. Therefore, both tape guide blocks 2 and 3 have both guide grooves 1
3, it slides on both guide rails 11 and 12 and can reciprocate along both outside sides of the rotary head drum 1 between a backward movement position shown by a dashed line and a forward movement position shown by a solid line. It is configured as follows. Note that the reciprocating movement of both tape guide blocks 2 and 3 is performed by a moving mechanism (none of which is shown) consisting of a ring gear, a connecting link, etc.

Next, when the tape cassette 4 is installed at the cassette installation position, both tape guide blocks 2.
3 is inserted relatively inside the tape 5 in the tape cassette 4. Then, following the installation of the tape cassette 4, both tape guide blocks 2,
3- slides on both guide rails 11.12 while being guided by both guide grooves 13, and starts forward movement (sliding movement) in the directions of arrows a and b from the backward movement position. And each tape guide in both tape guide blocks 2゜3? , 8.9 lock the tape 5 and gradually pull out the tape 5 to both outsides of the rotary head drum 1 in front of the tape cassette 4.

When both tape guide blocks 2.3 are moved forward to the forward movement position shown by the solid line, both tape guide blocks 2.3 are attached to a pair of positioning pins 16° 17 fixed on both guide rails 11° 12. A pair of Vs provided at the front end of
Grooves 18 and 19 are engaged so that both tape guide blocks 2
, 3 are stopped at the forward movement position. Note that both guide rails 1
1.12 is tilted upside down along the helical angle of the tape lead (not shown) of the rotary head drum 1, and as a result, both tape guide blocks 2.1.12 are moved forward to the forward movement position.
The tape 5 is loaded onto the circumferential surface 1a of the rotary head drum 1 in a predetermined helical state and at a wrapping angle of nearly 360° in an approximately Ω shape.

By the way, each tape guide attached to both tape guide blocks 2 and 3? , 8.9 are composed of so-called air guides. Namely, each tape guide? , 8
．． A plurality of small holes 21 are provided in the circumferential surfaces 7a, 8a, 9a of 9 in a line in the vertical direction. In the drawing, the tape guide 8 is partially shown in cross section. Both tape guide blocks 2.3 and an air supply device 22 such as an air compressor are connected by an air supply tube 23, and the air supplied from the air supply device 22 is transferred to each tape guide. , 8.9 is configured to eject from small holes 21. Note that the small hole 21 of each tape guide 7.8.9 is located at the center position within the winding angle (contact angle) of the tape 5 with respect to each tape guide 7.8.9, as indicated by the arrow c,
It faces the d and e directions.

After the tape 5 is loaded onto the circumferential surface 1a of the rotary head drum 1, air is blown out from the small holes 21 of each tape guide 7°8.9. Thereby, the circumferential surface 7a, 13a of each tape guide 7.8.9.

An air film is formed between 9a and the tape 5, and the tape 5 is attached to each tape guide. , 8.9 circumferential surface 7 a +8
a, it is levitated from 9a and runs. Therefore, tape 5
Is each tape guide? , 8.9 will be driven with reduced friction. Note that the directions of arrows f and g are the running direction of the tape 5 and the rotation direction of the rotary head drum 1.

[Problem that the invention seeks to solve]

In the conventional tape guide device described above, an air supply tube 2 is provided for supplying air to each tape guide 7.8.9.
3 was connected to both tape guide blocks 2.3 that reciprocate between the backward movement position and the forward movement position, so when the tape guide blocks 2 and 3 were reciprocated, was dragged and moved over a wide range on both sides of the rotary head drum 1, as shown by the solid line and the dashed-dotted line.

However, both outer sides of the rotary head drum 1 are areas where the tape 5 pulled out from the tape cassette 4 is run, and various complicated mechanisms such as a moving mechanism for both tape guide blocks 2 and 3 are arranged. It's also a part of me. Therefore, when the air supply tube 23 is dragged, there is a risk that the air supply tube 23 will get caught and the reciprocating movement of both the tape guide pro-ts 2 and 3 will become impossible, or the air supply tube 23 will be accidentally cut. There were many accidents.

Therefore, the present invention is intended to prevent the air supply tube and the like from being dragged when the tape guide block is reciprocated.

[Means for solving problems]

In the present invention, the tape guide block is provided with an air intake port communicating with the small hole of the tape guide, and the forward movement position of the tape guide block is provided with an air supply block having an air supply port, When the guide block is moved forward to the forward movement position, the air intake port is connected to the air supply port of the air supply block to supply air to the tape guide.

[Effect]

According to the above-mentioned technical means, the air supply tube etc. for supplying air to the tape guide becomes irrelevant to the reciprocating movement of the tape guide block, and remains fixed to the air supply block in the forward movement position of the tape guide block. be.

Therefore, when the tape guide block is reciprocated, the air supply tube and the like are not dragged on the outside of the rotary head drum along with the reciprocating movement of the tape guide block.

〔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 to 4. Note that the same parts as those of the conventional example described in the [Prior Art] section are given the same reference numerals, and the explanation thereof will be omitted. Also, the pair of tape guide blocks 2 and 3
Since they are symmetrical and equivalent, one tape guide block 2 will be explained.

First, a slope 26 is formed at the front corner of the tape guide block 2. Although the slope 26 is vertical, it is inclined in the i direction with respect to the movement direction h (FIG. 1) when the tape guide block 2 is moved forward to the forward movement position. An air inlet 27 is provided on the slope 26, and this air inlet 27 is connected to each tape guide through a connection hole 28 formed in the tape guide block 2. , 8.9 communicates with the small hole 21.

By the way, the tape guides 8 and 9 are constructed as shown in FIG. That is, the tape guides 8 and 9 have a cylindrical shape, and the guide shaft 30 is fixed to the tape guide block 2.
It is vertically movably inserted with upper and lower flanges 31 and 32 for regulating the tape height.

These tape guides 8.9 and upper and lower flanges 31
．． 32 is a nut 3 which is urged upward by a compression coil spring 33 inserted between the tape guide block 2 and the lower flange 32 and is screwed onto the upper end of the guide shaft 30.
4.

A pin 35 is press-fitted into the guide shaft 30, and this pin 35 is fitted into a slit 36 formed in the tape guides 8 and 9. Therefore, by rotating the nut 34, the upper and lower flanges 31 are aligned with respect to the tape guide block 2.
．． 32 and the heights of the tape guides 8 and 9 can be adjusted.

A plurality of small holes 21 are provided in a row in the vertical direction on the circumferential surfaces 8a and 9a of the tape guides 8 and 9, and communicate with a hole 37 formed in the center of the guide shaft 30. 37 communicates with the connecting hole 28.

As shown in FIG. 2, the tape guide 7 (inclined guide) is fixed to the support block 38 on the tape guide block 2, and is almost the same as the tape guides 8 and 9 described above except that the upper and lower flanges 31 and 32 are not present. The same is true.

Further, a U groove 40 is formed at the front end of the tape guide block 2. A stepped tapered surface 41 is provided within this U-groove 40.

On the other hand, an air supply block 43 is fixed to the forward movement position of the tape guide block 2, ie, the tip end on the guide rail 11, with, for example, a screw 44 so that its position can be adjusted. This air supply block 43 has a vertical positioning surface 45.
is formed, and an air supply port 4 is formed on this positioning surface 45.
6 is provided. The air supply block 43 is fixed such that its positioning surface 45 is inclined in the i direction similarly to the slope 26 of the tape guide block 2.

An air supply tube 47 from an air supply device (not shown) such as an air compressor is connected to the air supply block 43. Note that the upper edge of the positioning surface 45 of the air supply block 43 protrudes outward, and a tapered surface 48 is formed at the lower part thereof.

Further, the positioning pin 49 fixed to the tip portion of the guide rail 11 has a flange in which a tapered surface 50 is formed.

According to the tape guide device configured as described above, the air supply tube 47 is completely separated from the tape guide block 2, and the air supply tube 47 is never dragged when the tape guide block 2 moves back and forth. . When the tape guide block 2 slides on the guide rail 11 while being guided by the guide groove 13 and is moved forward to the forward position, the positioning pin 49 on the guide rail 29
The U groove 40 of the tape guide block 2 is engaged with the U groove 40 of the tape guide block 2, and the tape guide block 2 is stopped at the forward movement position. At this time, as shown in FIG. 4, the tapered surface 4 of the U groove 40
1 is pressed against the tapered surface 50 of the positioning pin 49, thereby preventing the tape guide block 2 from floating upward and positioning it in the vertical direction at its forward position. Note that when the tape guide block 2 is moved forward to the forward position, the upper edge of the slope 26 of the tape guide block 2 is aligned with the tapered surface 48 of the upper edge of the positioning surface 45 of the air supply block 43.
Since the tape guide block 2 is pressed in advance from above by the guide rail 11, it is possible to prevent the inconvenience that the U-groove 40 is not engaged with the positioning pin 49 due to the tape guide block 2 being moved forward while floating on the guide rail 11.

Then, when the tape guide block 2 is stopped, the slope 26 of the tape guide block 2 moves toward the air supply block 43.
The air intake port 2 of the slope 26 is in close contact with the positioning surface 45 of the
7 is connected to the air supply port 46 of the positioning surface 45. Here, air from the air supply tube 47 is supplied to the air supply port 46.
The air is supplied to the air intake port 27, and the air is supplied to each tape guide through the connection hole 28 in the tape guide block 2. , 8.9.

By the way, with respect to the moving direction of the tape guide block 2 immediately before the forward movement position, the slope 2 of the tape guide block 2
6 and the positioning surface 45 of the air supply block 43 are inclined in the i direction, so when the tape guide block 2 is stopped, the so-called wedge action of the slope 26 and the positioning surface 45 causes the tape guide block 2 to move in the direction of the arrow j. Pressed in the direction. As a result, the crimping surface P between the slope 26 and the positioning surface 45 is formed.

One crimping point Q1 of the crimping portion between the tapered surface 41 of the U-groove 40 and the tapered surface 50 of the positioning pin 49 Crimp point R1 of the guide pin 15 and the guide groove 13 By crimping these three places, the tape guide block 2 is guided. Horizontal backlash on the rail 11 is removed and positioning is achieved with great accuracy.

By positioning the tape guide block 2 accurately as described above, the tape guide block 2
The close contact between the slope 26 of the air supply block 43 and the positioning surface 45 of the air supply block 43 becomes even more reliable, and air leakage at this portion is almost eliminated. Further, by accurately positioning the tape guide block 2, loading of the tape 5 onto the circumferential surface 1a of the rotary head drum 1 and subsequent tape running can be performed with extremely high precision.

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.

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〕

As described above, according to the present invention, the air supply tube, etc. for supplying air to the tape guide is unrelated to the reciprocating movement of the tape guide block, and the air supply tube, etc. is connected to the reciprocating position of the tape guide block. It can remain fixed to a certain air supply block. Therefore, when the tape guide block moves back and forth, the tape guide block never drags the air supply tube or the like on the outside of the rotary head drum. Therefore, in areas where the tape is running and where complex mechanisms such as tape guide block moving mechanisms are installed, the air supply tubes, etc. may get caught, making it impossible for the tape guide block to move back and forth, or causing the air supply tubes, etc. Accidents such as accidental disconnection can be prevented, and piping such as the air supply tube can be extremely simplified. Therefore, air can be reliably supplied to the tape guide with an extremely simple structure, and safety and reliability are significantly improved.

Further, in the embodiment, since the tape guide block is positioned extremely accurately with vertical and horizontal backlash removed in the forward movement position, there is almost no air leakage at the air supply port and air intake port. Furthermore, the accurate positioning of the tape guide block allows for extremely high precision in loading the tape onto the rotary head drum and in subsequent tape running.

[Brief explanation of drawings]

1 to 4 show an embodiment in which the present invention is applied to a tape guide device of a video tape recorder,
Fig. 1 is a partially cutaway plan view of the tape guide block moved to the forward position, Fig. 2 is an exploded perspective view of the same as above, Fig. 3 is a cross-sectional view taken along line mm in Fig. 1, and Fig. 4 The figure is IV-I in Figure 1.
It is a sectional view taken along the V line. FIG. 5 is a plan view showing a conventional tape guide device for a video tape recorder. In addition, in the symbols used in the drawings, 1-・----
-------------Rotating head drum 1 a--
------
−−−−−・−・−・−・−Tape cassette 5−−−−
---------・----1・-・Tape 7, 8, 9
-----------Tape guides 7a, 8a
, 9a---------・Surrounding surface I L---------・
−・−2−・−Guide rail 21・−−−−−−−−1−−−−～−−・・Small hole 26−・・−−−−1−−・
-...-Slope 27...--
・Air supply block 45-----・・---1----
-----Positioning surface 46・-1------------
-----Air supply port.

Claims (1)

[Claims] A tape guide with small holes for blowing out air on its circumference, a tape guide block to which this tape guide is attached and arranged so as to be able to reciprocate along the outside of a rotating head drum, and this tape guide block restored. a guide rail that guides the tape guide block to move back and forth between a moving position and a forward moving position, and the tape guide block is guided by the guide rail to move forward from the backward moving position along the outside of the rotary head drum. By moving the tape forward to the position, the tape guide pulls out the tape from inside the tape cassette and loads it onto the circumferential surface of the rotary head drum. After loading, air is blown out from the small hole of the tape guide to close the tape guide. In the tape guide device, the tape guide block is provided with an air intake port that communicates with the small hole of the tape guide, and the tape guide block is provided with an air intake port that communicates with the small hole of the tape guide, and the tape guide block is provided with an air intake port that communicates with the small hole of the tape guide. is provided with an air supply block in which an air supply port is formed, and when the tape guide block is moved forward to the forward position, the air intake port is connected to the air supply port of the air supply block to supply air to the tape guide. A tape guide device configured to supply.