JPH0210556A - Tape guide positioning mechanism for recording and reproducing device - Google Patents

Abstract

PURPOSE:To highly accurately position a tape guide by providing a fixed member, which has a prescribed gap for the tape guide and approximates to it, when the tape guide in a loading condition is positioned at the prescribed point. CONSTITUTION:When the tape guide is positioned at the prescribed point in the vicinity of a root part 19b of the tape guide, a fixed member 27a to have the prescribed gap for the tape guide or for a guide base 27 to mount it and to approximate to the base 27 is set. Consequently, the fixed member 27a abuts on the tape guide or the guide base to mount it when the root of the tape guide is bent for a portion corresponding to the prescribed gap. Thus, the root 19b of the tape guide can be prevented from further bening, and the extreme deterioration of the accuracy of the tape guide can be avoided.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides information on winding a tape at a predetermined angle (hereinafter referred to as loading) around a tape guide drum, such as in a video tape recorder (hereinafter abbreviated as VTR). The present invention relates to a tape guide positioning mechanism suitable for recording or reproducing devices, and particularly to improving the performance thereof.

[Conventional technology]

Tape guide in traditional loading mechanism. ati
t*bms. -F10.411ff860-18848
1! It has the structure described in ', and is also applied to the company's product GR-C7.

[Problem to be solved by the invention]

The above-mentioned positioning mechanism is advantageous for positioning the guide base because it can generate a large eccentric force with a small pressure force in the loading state, but on the other hand, if the pressure force varies in the direction of increasing If the biasing force is excessive, the amount of deflection at the base of the tape guide increases, causing a problem in that the precision of the tape guide tends to deteriorate.

An object of the present invention is to solve this problem and provide a mechanism that can position a tape guide with high precision.

[Means to solve the problem]

The above purpose is to provide % near the base of the tape guide when the tape guide is positioned at a desired position.
This is achieved by installing a fixing member close to the tape guide or the guide base on which it is placed with a predetermined gap therebetween.

[Effect]

When the base of the tape guide is bent by an amount corresponding to the predetermined gap, the fixing member comes into contact with the tape guide or the guide base on which it is placed. Therefore, the base of the tape guide is prevented from bending any further, and the accuracy of the tape guide is prevented from being extremely degraded.

[Example] An example of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 2 shows a plan view of a magnetic recording and reproducing apparatus using a tape loading mechanism according to the present invention, in which 1 is a chassis, 2 is a tape guide drum on which a magnetic head is mounted, and the tape is wound on a 5μ supply reel 4 and a take-up reel 5. 7 is a capstan to which a motor 9 is directly connected to the lower end, 8 is a pinch roller, and 10 is a full-width erasing head that is fixedly supported on a catcher 28 and erases the entire width of the tape 6. , 11 are audio heads and control heads for recording and reproducing audio signals and control signals on the upper and lower ends of the tape 6. When the cassette 3 is installed in the apparatus, the lid 12 on the front side of the cassette 3 is opened. Further, inside the opening 13, there are a tension bin 16 and a guide roller 17.
and the tilted bin 18 are inserted, the guide roller 19 and the tilted bin 20 are inserted into the opening 14, and the tilted bin 21 and the capster/7 are inserted into the opening 15 at the positions indicated by broken lines and solid lines, respectively. .

At this time, the pinch roller 8 is also in the position shown by the broken line. When the loading operation is performed, each guide moves while pulling out the tape 6. The guide roller 17 and the inclined bin 1B move horizontally as a pair and are positioned near the tape guide drum 2. Guide roller 19 and tilt bin 20
form a pair, move horizontally up to the vicinity of the audio head and control head 11, and thereafter move diagonally downward to be positioned near the tape guide drum 2. Approximately 2,700 tapes 6 are wound on the tape guide drum 2. do. The tilt bin 21 moves horizontally from behind the tilt bin 20 and is fixed upstream of the audio head and control head 11, corrects the attitude of the tape 6, and guides it to the winding wheel 5.

As a result, the tape 6 comes out from the cassette 5, passes through the tension bin 16, the impedance roller 22, the full-width erasing head 10, the guide roller 17, and the inclined bin 18, and is wound spirally around the tape guide drum 2 at a predetermined angle. Roller 19, inclined bin 20, inclined bin 21, fixed guide 23
, the audio head and the control head 11 , the height regulation guide 24 , and the fixed guide 25 , and are driven in pressure contact with the capstan 7 and the pinch roller 8 to reach the take-up reel 5 .

FIG. 5 is a side view when loading is completed.

In this embodiment, the present invention is applied to the positioning of the guide roller 19 and the inclined bin 20 on the cylinder exit side.This positioning method will be described in detail below.

FIG. 1 is an enlarged view showing the positioning state of the guide roller 19, the inclined bin 20, and the catcher 28 when loading is completed, and (a) is a plan view thereof, and (1) is a side view thereof. In addition, 27 is a guide base on which the guide roller 19 and the inclined bin 20 are set up, and is moved to the gero-loading position by a drive/crimping mechanism (not shown) via the connecting plate 29, and is crimped onto the catcher 28. Positioned. When loading is completed in FIG. 1, the upper end 19a of the guide roller 19 contacts the V-shaped portion 2B& of the catcher, the upper tip 271) of the guide base 27 contacts the receiving surface 281) of the catcher, and , the rear lower surface 27c of the guide base contacts the catcher receiving surface 28d,
Further, the convex portion 27a integrally formed on the lower surface of the guide pace is positioned in a state in which it is in contact with the lower side portion 28d of the U-groove portion of the catcher 28 in FIG.

As for the order of positioning operations, when the pressing force is transmitted to the guide base 27 via the connecting plate 29, first, the upper end portion 19a of the guide roller is moved to the V-shaped portion 28 of the catch.
a, and around this abutting part, the guide base 2
7 and an arrow 30 indicating the tape guide in FIG. 1(b).
An eccentric force is generated that rotates the guide base 2 in the direction of
7 and the catcher 28 are in a state where the above-mentioned 27b and 281) and 27c and 28d are in contact with each other.0 When the tape kites 19 and 20 are in the desired position, the convex portion 27a is in contact with the catcher 28. It is separated from the end portion 28c of the U groove, which is a stopper, with a gap of approximately α1 mm. However, if the pressing force becomes excessive (due to fluctuations in the pressing spring, etc.), the biasing force also increases. Then, while the guide base 27 and the catcher 28 are still in contact with the contact portions 27b and 28b1 and 27c and 28d, the root portion 19b of the guide roller 19 is bent, and the guide base 27 is in contact with the catcher 28. It penetrates excessively deep inside.

As the amount of the tape guide increases, the positional accuracy of the tape guide deteriorates, and when the tape guide enters too far into the desired tape running path, the convex portion 27a on the lower surface of the guide base 27 comes into contact with the U-groove end 28c of the catcher 28. The structure is such that it cannot be penetrated any further. The state at this time is shown in FIG. Further, the structure of the catcher is shown in FIG. 5 in a perspective view.

With the structure described above, the positioning error of the tape guide in this embodiment is approximately α1 mm even when excessive pressure is applied, and the folding angle of the guide roller 19 at this time is also approximately 20 mm. Therefore, the performance deterioration is minimal and can be suppressed to a level that does not pose a problem in practice.

Further, according to this embodiment, it is possible to provide a stopper for the guide base 27 integrally with the catcher 28.
Furthermore, the U-groove portion of the catcher has a shape that was necessary before the application of this embodiment), and the effects of the present invention can be obtained only by adjusting the position of the end portion 28c. There is no cost increase associated with the application of this embodiment, and it can be said that this embodiment is extremely efficient.

〔Effect of the invention〕

According to this embodiment, since the deflection of the tape guide base can be suppressed to a predetermined amount or less, there is an effect of improving the positioning accuracy of the tape guide.

[Brief explanation of the drawing]

1 and 4 are a plan view and a side view showing a tape guide positioning mechanism according to an embodiment of the present invention, FIG. 2 is a plan view showing the entire device, and FIG. 6 is a side view of FIG. FIG. 5 is a perspective view showing the catcher structure. 1...Chassis, 2...Tape guide drum, 3...
Cassette, 6... tape, 19... guide roller,
20... Inclined pin, 27... Guide base, 28.
°・Catcher.

Claims (1)

[Claims] 1. A tape guide drum equipped with a rotating head for recording information on tape or reproducing information from tape;
a tape guide group for pulling out a tape from a cassette and wrapping it around the side surface of the tape guide drum so that information can be recorded or reproduced, and for forming a predetermined tape running path; In the recording/reproducing apparatus, the recording/reproducing apparatus is provided with a guide base that reciprocates between a loading position and an unloading position, and a positioning means for positioning the guide base at the loading position. A record characterized in that when the tape guide is positioned at a desired position, a fixing member is installed adjacent to the tape guide or the guide base on which it is placed with a predetermined gap. Tape guide positioning mechanism for playback equipment.