JPH0315274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a tape guide device that constitutes a running path for a magnetic tape in a magnetic recording/reproducing device such as a video tape recorder.

[Background of the invention]

Home video tape recorders and the like are equipped with a tape guide device that extracts a magnetic tape from a cassette tape, wraps the magnetic tape at a predetermined angle around a cylindrical tape guide having a rotating head, and forms a predetermined tape running path. There is. When the tape is pulled out from the cassette, it is initially located at the bottom of the cassette, and as the tape is pulled out, it is moved to a position near the cylindrical tape guide with a rotating head. During operation, the magnetic tape is fixed so that its running is stable in a predetermined position.

Conventional examples of such a tape guide body for pulling out and guiding the tape and a holder for holding the tape guide body are shown in FIGS. 1 and 2. FIG. 1 is a plan view, and FIG. 2 is a partially sectional side view.

In the figure, 8 is a guide roller block constituting a tape guide, and 12 is a catch block constituting a holder. The guide roller block 8 includes a guide roller base 1 , a guide roller 3 screwed into a holder shaft 2 implanted therein, an inclined holder 4 attached to the guide roller base 1 with screws, and a guide roller 3 screwed into the holder shaft 2 mounted on the guide roller base 1 , an inclined holder 4 attached to the guide roller base 1 with screws, and a guide roller 3 screwed into a holder shaft 2 implanted therein. An inclined pin 5 installed diagonally and a spring screwed to the guide roller base 1 in such a way as to sandwich the guide plate 6 so that the guide roller base 1 can slide along the guide groove 6a portion of the guide plate 6. The limit plate 7 is made up of a body. This guide roller block 8 has a compression spring 9
It is rotatably connected to a shaft 10a provided on a drive link 10 having a shaft.

The catcher block 12 has a catcher 11 having U-shaped grooves on the upper and lower sides fixedly placed on the guide plate 6, and has the guide roller block 8 moved by suitable drive links (not shown). It is arranged so as to be held in contact with the catcher 11. The pressing force of the guide roller block 8 on the catch block 12 is obtained by a compression spring 9 engaging the link 10. The guide roller block 8 includes a guide groove 6a portion that holds the guide roller base 1, a lower end of the holder shaft 2,
When the tip of the guide roller 3 comes into contact with the catcher 11, positioning in the XY directions shown in FIG. 1 is determined. Furthermore, the tip 8a of the guide roller block 8 and the recess 11a at the lower part of the catcher 11 come into contact with each other, and the lower surface of the inclined holder 4 screwed to the guide roller base 1 and the protrusion 12a of the catcher block 12 contact each other. XZ shown in Figure 2
The directional positioning has been determined.

Here, one of the manual adjustments necessary to form the optimum tape running path is the relative position adjustment between the inclined pin 5 and the guide roller 3. Conventionally, the inclined holder 4 screwed to the guide roller base 1 is slightly rotated around the holder shaft 2.
It was fixed with screws. Guide roller block 8
Since it is necessary for the guide roller block 8 to enter the lower part of the cassette (not shown) in order to pull out the tape from the cassette when the apparatus is stopped, it is not possible to make the guide roller block 8 have a double structure as shown in the figure. This is disadvantageous in making the set smaller, especially in making it thinner.
Furthermore, since the number of parts increases, there is a problem that variations in the dimensions of each component cause variations in performance.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape guide positioning device that is effective in reducing the thickness of the entire set, reduces the number of component parts, and reduces factors that cause dimensional variations.

[Summary of the invention]

In order to achieve the above object, the present invention has an integral structure of the guide roller base and the inclined holder, and allows the guide roller base to slightly rotate about the guide roller as the rotation axis when it comes into contact with the catch block. A feature is that a guide member is provided. By doing this, the element of dimensional variation is eliminated, there is no need for set screws, and moreover,
Since no adjustment mechanism is provided on the guide roller base side, the guide roller block can be made significantly thinner.

[Embodiments of the invention]

The present invention will be explained below using examples. 3 and 4 show a tape guide according to an embodiment of the present invention, and correspond to FIGS. 1 and 2, respectively. 5 and 6 are schematic plan views showing an example of a video tape recorder to which this tape guide and positioning device are applied. FIG. 5 is a stopped state, and FIG. 6 is a tape loading state. Indicates the running state that has ended.

The tape 14 stored in the cassette 13 is drawn out by guide roller bases 16a and 16b that move along guide grooves 15a and 15b, and is wound around a rotating head cylinder 17. The guide roller bases 16a and 16b are connected to the catchers 18a and 16b, which are fixed to the catcher block 19.
It is received and held and fixed by 18b, thereby forming a predetermined tape running path. Guide roller base 1
The movement of 6a, 16b can be driven by a suitable link mechanism (not shown) engaged with an elastic body, and the pressing force on the catchers 18a, 18b can be obtained by the elastic body. A pair of guide roller bases 16a, 16b and catchers 18a, 18
3 and 4 show the guide roller base 16b and catcher 18b on the right side.

The guide roller block 24 includes a guide roller 22 screwed into a holder shaft 21 installed on the guide roller base 16b, an inclined pin 20 installed diagonally on the guide roller base 16b, and a guide roller base 16b connected to the guide plate 15. The limit plate 23 is made of a spring body screwed so as to be slidable along the guide groove 15b of the guide groove 15b. Guide roller block 24
The drive link 2 is provided with a pressing force by an appropriate elastic body (not shown) that is engaged with a guide pin 24a installed on the lower surface of the guide roller base 16b.
It is rotatably connected to 5.

The catchers 18a and 18b mounted on the catcher block 19 have V grooves and U grooves on the upper and lower sides, and hold the guide roller block 24 moved by the drive link 25 in contact with the catchers 18a and 18b. The positioning of the guide roller block 24 on the XZ plane shown in FIG. This is achieved by the contact between the lower surface of the laterally extending portion 16d and the convex portion 19a of the catch block 19.
The positioning of the guide roller block 24 in the X and Y directions is performed using a guide arm 28 that is adjustable so that the guide roller block 24 can rotate slightly around the holder shaft 21 which is held between the V groove and the U groove of the catcher 18b. I'll turn around and go. The guide arm 28 is rotatably supported on the base plate 26 about a shaft 27, and the guide portion 28a at the bent tip thereof is provided so as to be located on the same plane as the guide plate 15. It is arranged so as to come into contact with a guide pin 24a implanted in the guide roller base 16b. FIGS. 7 and 8 show external views of this guide arm. Guide roller block 24
is driven by the drive link 25 to the catcher 18b.
The drive link mechanism is configured to be elastically pressed by both the guide portion 28a of the guide arm 28 and the guide portion 28a of the guide arm 28. Therefore, the guide arm 28
When the guide roller block 24 is rotated about the shaft 27, the guide pin 24a embedded in the guide roller base 16b is pushed by the guide portion 28a and comes into contact with the V groove and U groove of the catcher 18b. The tilt pin 20 rotates around the holder shaft 21, and the relative position of the tilt pin 20 with respect to the guide roller 22 can be adjusted. Although this guide arm 28 is not shown, it goes without saying that it is also provided symmetrically on the side of the catcher 18a.

In this way, the guide roller base and the inclined holder are integrated, and the position of the guide roller block can be adjusted by the guide arm when the guide roller block comes into contact with the cassette, so that the guide roller base fits into the bottom of the cassette. Parts can be made thinner. Therefore, it is not only possible to make the entire device thinner than conventional devices, but also the integration of component parts reduces dimensional variations and improves performance.

〔Effect of the invention〕

As described above, according to the present invention, a tape guide positioning device with improved accuracy and suitable for a small and thin magnetic tape recording/reproducing device can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional tape guide and positioning device, Fig. 2 is a side view showing a part of it in cross section, Fig. 3 is a plan view showing an embodiment of the present invention, and Fig. 4 is a plan view of a conventional tape guide and positioning device. Side view of Figure 3, partially shown in cross section, Figure 5
6 and 6 are schematic plan views showing the entire magnetic recording and reproducing apparatus equipped with the tape guide positioning device of the present invention, and FIGS. 7 and 8 are external appearances of main parts used in one embodiment of the present invention. FIG. 1, 16a, 16b...Guide roller base,
2, 21... Holder shaft, 3, 22... Guide roller, 4... Inclined holder, 5, 20... Inclined pin, 6, 15... Guide plate, 6a, 15a, 1
5b... Guide groove, 7, 23... Limit plate, 8, 24... Guide roller block, 10,
25... Drive link, 11, 18a, 18b...
Catcher, 12, 19... Catcher block, 13... Cassette, 17... Rotating head cylinder, 26... Board, 28... Guide arm.

Claims (1)

[Claims] 1. In a magnetic tape recording and reproducing device that pulls out a tape from a cassette to a predetermined running path and performs recording and playback, there is a tape guide base that moves from the bottom of the cassette to the bottom of the tape running path, a cylindrical guide installed in the base, and a cylindrical guide installed on the cassette plane. A tape guide body consisting of a cylindrical body inclined with respect to the tape guide body, the tip of the tape guide base that moves to form a tape running path during recording and playback, and the upper and lower parts of the cylindrical guide implanted therein. When the catch block to be held and the tape guide body are rotatably supported on a base plate and are in contact with the catch block, the tape guide body abuts and engages with the base of the tape guide body, and the cylindrical shape is rotated. A guide arm for rotationally displacing the tape guide base around the guide, and a drive means for moving and driving the tape guide to press into engagement with the catch block and guide arm via an elastic body, A tape guide positioning device characterized in that the amount of rotational displacement of the tape guide base about the cylindrical guide is regulated by the rotation of the guide arm, and the relative position of the inclined cylindrical body can be adjusted.