JPS59104754A - Positioning device of tape leader - Google Patents

Abstract

PURPOSE:To improve the positioning accuracy with no increase of cost by fixing a catcher to the holding base of a rotary head cylinder, and positioning a guide roller block mainly by the size of the upper surface of a V-shaped projection of the guide roller block as well as the projected part. CONSTITUTION:Guide roller blocks 17 and 18 are hooked and held to catchers 21 and 22 fixed on a base 20 holding a rotary head cylinder 19. The positioning of the block 17 within an XZ plane is decided by a press contact between a V- shaped support part 21a of the catcher 21 and a holder shaft 17b of the block 17. The up-down movement of the block 17 is decided by the upper surface 21f of the catcher 21 and the upper surface 17c of a V-projection at the tip of a guide roller base 17d. The up-down rotations of the block 17 is decided by a projected part 17g of the base 17d, a projected part of an arm 21b of the catcher 21 and the interlocking with 21c. Furthermore the positioning of the block 17 within an XY plane is decided by a contact between a U-shaped groove 21e of the catcher 21 and the shaft 17d as well as a contact between a projected part 17e of the shaft 17d and an inner surface 21d of the arm 21b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape drawer and straightening device for a cassette type VTR.

An example of a conventional device of this type will be explained with reference to FIGS. 1 and 2. These figures show the tape drawer block housed in a holder for holding and positioning the block; FIG. 1 is a plan view thereof, and FIG. 2 is a partially sectional side view thereof.

A guide roller block consisting of a guide roller 6 screwed into a boulder shaft 2 installed in the guide roller base 1, an inclined guide block 4 attached to the guide roller pace 1 with screws, etc. is installed below the guide roller pace 1. The protrusion 1c is placed so as to be able to slide in a guide groove 6a provided in the chassis 6. A pin 5a of the drive link 5 is attached to this protrusion 1c. Therefore, the guide roller block is connected to the pin 5 of the drive link 5.
a receives force through the protrusion 1c, and the chassis 6
It moves in the direction of arrow A while being guided by a guide groove 6aK provided in the guide groove 6aK. At this time, the tape is pulled out from the cassette.

On the other hand, a base 7 holding a rotating head reader/reader (not shown) is placed on the chassis 6. Further, a catcher 8 is placed on the base 7 to hold the moved guide roller block at a required position.

Here, the positioning of the guide roller block on the X2 plane is achieved by fitting the V-shaped groove 8a provided in the catcher 8 with the V-shaped protrusion 1a tilted at the tip of the guide roller pace 1, and The protrusion 7b is provided to protrude upward and the protrusion 7b is provided below the inclined guide block 4.
This is determined by the engagement of the protrusion 4a that is provided so as to come into contact with. Alternatively, it is determined by the above-mentioned former and the contact between the upper surface of the chassis 6 and the sliding portion 1b provided below the guide roller pace 1.

In addition, positioning on the X2 plane is determined by the engagement of the U-shaped groove 8b provided above the catcher 8 with the guide roller shaft 3a, and the engagement of the U-shaped groove 8c provided below with the boulder shaft 2.

Furthermore, positioning on the X7 plane is performed using the U-shaped groove 8c and the holder shaft 2. This is determined by the fit between the protrusion 1c provided below the guide roller pace 1 and the guide groove 6a.

However, the conventional positioning methods as mentioned above have
There is a drawback that the positioning on the X7 plane and the X2 plane tends to vary widely. This is because, in the case where the positioning of the Become a thing. When the chassis 6 is made by press working, its dimensions in the thickness direction are generally not constant due to warpage and bending. Furthermore, a material with high rigidity cannot be used for the chassis 6. therefore.

The surface of the chassis 60 at the contact portion with the sliding portion 1b varies, and the position of the sliding portion 1b varies. Also, X2
Even when the position on the plane is determined by the protrusion 4a and the protrusion 7b, the position is determined via the protrusion 4a. In this case, since the position of the protrusion 4a is determined via the guide roller pace 1 and the inclined guide block 4, the dimensional tolerance of each of these parts increases by 1 minute, and in addition to the surface variation of the chassis 60, This causes variations in rotation in the vertical direction on the surface.

If variations occur in the xy, xz planes for the reasons described above, these variations will eventually lead to positional variations in the guide roller 6. For this reason, there is a drawback that the precision of the tape guide deteriorates, making it difficult to obtain good tape running.

In addition, when the tape drawer block is positioned using multiple parts as described above, in order to suppress variations in the position of the guide roller 6, it is necessary to improve the dimensional accuracy and assembly accuracy of each single part. This has the disadvantage that it also leads to increased costs due to secondary processing and the like.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape drawer and body straightening device that eliminates the above-mentioned drawbacks and improves positioning accuracy.

The present invention is characterized by first and second catchers disposed on both sides of a rotary cylinder containing a rotary head mounted on a substrate, and when recording and reproducing a tape, the first and second catchers are The first value held in each
and a tape drawer straightening device comprising a second guide roller block, wherein the guide roller block includes a guide roller base having a V protrusion facing the catcher and a protrusion provided below; a holder shaft installed substantially perpendicularly to the guide roller base; an upper surface of a V-groove portion that abuts and engages with the upper surface of the protrusion to restrict vertical movement of the guide roller block; an arm that abuts and engages with the protrusion and restricts rotation in a plane parallel to the substrate; a protrusion formed on the arm that abuts and engages with the protrusion and restricts vertical rotation;
and a U-shaped groove that abuts and engages with the lower part of the holder shaft to restrict rotation in a plane perpendicular to the moving direction of the guide roller block.

The present invention will be explained below by way of practical examples. FIG. 3 is a plan view schematically showing a VTR mechanism section using the present invention, and shows a stopped state in which a tape is stored in a cassette. Figure 4 shows
FIG. 5 is a plan view of a normal playback state in which the tape drawer pulls out the tape from inside the cassette to a required running path and causes the tape to run.

The tape 12 stored in the cassette 11 is inserted into the first guide groove 14 and the second guide '#15 of the main chassis 13.
and is pulled out by the first and second guide roller blocks 17, 18 which move without being guided by the sub-plate 16. First and second catchers 21 and 22 are fixed on a base 20 that holds a rotating head cylinder 19 fixed to the main chassis 1.
By engaging and holding the first and second guide roller blocks 17 and 18, the tape 12 is mounted on the required travel path.

Here, the first catcher 21 according to an embodiment of the present invention
The structure of the second guide roller block 18 will be explained with reference to FIGS. 5 and 6, respectively.

Figures M5 and M6 show perspective views of the first catcher 21 and the second guide roller block 18, respectively.

As shown in FIG. 5, the first catcher 21 has a V
The letter-shaped support portion 21 m, the protrusion provided below the guide roller base of the guide roller block, and its inner surface 2
1d has an arm 21b that is engaged with the arm 21b. Ah J-
A protrusion 21c is formed on the upper surface of the arm 21b, and a U-shaped groove 21e is formed on the side surface of the base of the arm 21b.

On the other hand, as is clear from FIG. 6, the second guide roller block 18 includes a guide roller 18a, a holder shaft 18b, a protrusion 18c, a guide 0-5 base 18d,
It has a protrusion 18e and an inclined guide block 18f screwed to the kite roller base j8d.

The first and second guide roller blocks 17 and 18 are
The rotating head cylinder 19 is positioned by the first and second catchers 21 and 22, respectively, but since they are functionally substantially symmetrical, the rotary head cylinder 19 will be described below to simplify the explanation.
Only the first guide roller block 17 on the left side will be described.

7 and 8, the first guide roller block 17 is located on the left side of the rotary head cylinder 19, and the first
A plan view and a partially sectional side view of the catcher 21 in a state engaged with the catcher 21 are shown. Moreover, FIG. 9 shows a bottom view in the same state as FIG. 7.8.

The positioning of the first guide roller block 17 is the same as in the conventional example in the YZ plane, so a description thereof will be omitted. The difference from the conventional example is positioning within the XY and X2 planes.

The positioning of the first guide roller block 17 within the X2 plane is determined by the fact that the V-shaped support portion 21a of the first catcher 21 and the holder shaft 17b of the first guide block 17 are pressed together. This pressing force is always applied to the first guide block 17 by the drive link 23. On the other hand, the vertical movement of the guide roller pace 17d is determined by the vf# portion upper surface 21f of the first catcher 21 and the V-projection upper surface 17c at the tip of the guide roller pace 17d. Also, a protrusion 17g provided below the guide roller pace 17d allows vertical rotation in the X2 plane.
It is determined by the engagement with the protrusion 21e of the arm 21b, which is provided to protrude from the lower part of the first catcher 21 in the moving direction of the first guide roller block 17.

Also, the first guide roller block 1 in the XY plane
7 is positioned by the contact between the U-shape *21e provided below the first catcher 21 and the holder shaft 17b, and the contact between the protrusion 17e provided below the guide roller pace 17d and the inner surface 21d of the arm 21b. Determined by contact. Note that the protruding portion 17elC of the first guide roller block 17 is biased by the driving link 23 so as to always come into contact with the inner surface 21d, as described above.

Further, the first catcher 21 is mounted so that when the first guide roller block 17 is held on the first catcher 21, it rises above the upper surface of the main chassis 16, leaving a gap.

As is clear from the above description, the positioning of the first guide roller block 17 according to the present embodiment is mainly performed between the upper surface 17e of the V protrusion of the guide roller block 17 and the protrusion 17g.
Determined by the dimensions of However, both the V-projection upper surface 17e and the projection 17g are surfaces that are conventionally machined for accuracy reasons. Therefore, even if the dimensional accuracy of these parts is improved, the cost will hardly increase compared to the conventional one. Further, in this embodiment, unlike the conventional device, the main chassis 13 and the inclined guide block 17f are
Since it is not used for positioning, the flatness of the main chassis 13, which is a processed workpiece, and the inclined guide block 1
It is not affected by the accumulation of dimensional tolerances etc. due to the passage of 7f. Therefore, the accuracy is better than that of the conventional example.

As described above, according to the present invention, it is possible to obtain a tape drawer and straightening device that is more accurate than the conventional tape drawer and position straightener without increasing costs, and the tape running accuracy can be improved. Also, in automatic assembly, etc., the elements of the tape drawer position straightening section are configured as one part, which has the effect of preventing positioning variations during assembly.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the conventional example, FIG. 2 is a side view of the conventional example, and FIGS. 3 and 4 are VTR 11! of an embodiment of the present invention. A schematic view of the structure; FIG. 5 is a side view of a catcher, which is a component of an embodiment of the present invention; and FIG. 6 is a side view of a guide roller block, which is another component of an embodiment of the present invention. , FIG. 7 is a plan view of one embodiment of the present invention, FIG. 8 is a side view of the seventh embodiment, and FIG. 9 is a bottom view thereof. 11...cassette, 12...tape, 1
3... Main chassis, 14.15... Guide groove,
16...Sub plate, 17.18...First, second
19... Rotating head cylinder, 21.22... First and second catchers,
17a...Guide roller, 17b...Holder shaft, 17C...■Protrusion, 17d...Guide roller pace, 17e...Protrusion, 17f
...Incline guide block, 17g...Protrusion, 2
1a... V-shaped support part, 21b... Arm, 2
1c... protrusion, 21d... inner surface, 21e
... U-shaped groove, 21t・Vt1l 1st Department Top Representative Patent Attorney Michi Hiraki Hito Iil? b Nosa 21EI b Ko b Noshio 3J Shiohama 4j! ! j7 I5. Wandering 1 1d! 611111 8e 71811 7 gszi

Claims (1)

[Claims] (i) First and second catchers placed on both sides of a rotating cylinder containing a rotating head placed on a substrate, and a shell that is attached to each of the first and second catchers during tape recording and playback. First and second retained
In the tape drawer straightening device comprising a guide roller block, the guide roller block has a V protrusion facing the catcher and a protrusion provided below. A V-shaped support part 1 that biases a holder shaft that is set up substantially perpendicularly to the roller pace, and that the catcher abuts and engages with the upper part of the holder shaft to restrict the movement position at the contact point; An arm that abuts and engages with the upper surface of the V protrusion and restricts the vertical movement of the guide roller block. ■An arm that abuts and engages with the upper surface of the groove, and that also abuts and engages with the protrusion and restricts rotation in a plane parallel to the substrate. , a protrusion formed on the arm that abuts and engages with the protrusion and restricts rotation in the vertical direction; and a protrusion that abuts and engages with the lower part of the holder shaft, with respect to the moving direction of the guide roller block. A tape drawer and body straightening device characterized by having a U-shaped groove that restricts rotation in a vertical plane.