JPH04318355A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To smoothly remount a magnetic tape on a guide post, etc., without flawing the magnetic tape at the time of remounting them with the magnetic tape slackened by dwindling its tape tension in a rotary head type magnetic recording and reproducing device. CONSTITUTION:An elastic material 100 in a plate shape having slanting surfaces between an arm 74 and a lower side projecting part 23' of the guide post 23 is provided, and when the magnetic tape slips out, the magnetic tape is remounted on the guide post along the slant surfaces of the elastic material.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention automatically pulls out a magnetic tape from a tape cassette containing a supply reel and a take-up reel, winds it at a predetermined angle around a cylindrical rotating head cylinder containing a rotating head, and uses the rotating head to This relates to a rotating head type magnetic recording and reproducing device (hereinafter simply referred to as a VTR) that records and reproduces signals, and in particular, the mounting height of various guide posts etc. that are effectively placed when loading magnetic tapes. It's about coordination.

0002

[Prior Art] In recent years, VTRs have been made smaller, lighter, and thinner. In particular, the configuration of the loading mechanism of a VTR is extremely complex and has a large number of parts, which greatly affects the overall size of the VTR. Therefore, the development of loading mechanisms has become a very important theme.

A conventional VTR will be explained below with reference to the drawings. 3 and 4 are a schematic plan view and a perspective view showing the main parts of the tape path in a conventional VTR, respectively. In the figures, 1 is a chassis, and 2 is a tape cassette attached to the chassis 1. A supply reel 3 and a take-up reel 4 are disposed within the tape cassette 2. When the tape cassette 2 is attached to the chassis 1, a loading roller post 8 is inserted into the notches 5, 6, and 7 formed on the front surface of the tape cassette 2 on the supply side.
and tension post 9, first and second winding side loading roller posts 10, 11, and pinch roller 12.
are respectively inserted inside the magnetic tape 13. 14,
Reference numeral 15 denotes a supply side boat and a take-up side boat on which a supply side loading roller post 8 and first and second take-up side loading roller posts 10 and 11 are mounted. In addition, an inclined post 16 is provided, and the notch is provided along with the supply side loading post 8 by loading guides (not shown) on the supply side and the winding side arranged along the circumference of the rotating head cylinder 19. 5 is inserted.

Further, the rotating head cylinder 19 is disposed substantially perpendicularly to the chassis 1, and the supply side loading roller post 8 is configured to rotate the supply side reel 3 when the supply side board 14 moves along the supply side loading guide. The magnetic tape 13 pulled out from the rotating head cylinder 1
9, the winding side is wound diagonally upward to the left as shown in FIG. Magnetic tape 1 pulled out from 4
3 around the rotating head cylinder 19 to the right and diagonally downward. At this time, as shown in FIG. 4, the magnetic tape 13 supplied to the rotary head cylinder 19 by the supply side loading roller post 8 is guided diagonally downward from the top of the rotary head cylinder 19, and is guided diagonally downward from the outlet of the rotary head cylinder 19. On the side, the first loading roller post 10 on the winding side reverses and pulls out the tape in a gentle tape path pointing diagonally upward from the bottom, and the second loading roller post 11 on the winding side maintains a slightly forward tilted posture. while being guided diagonally upward by a gentle diagonal path.

A capstan 20 is provided on the chassis 1 outside the mounting position of the tape cassette 2, and its upper and lower ends are supported by bearings 21, and the inclination of the winding-side loading posts 10 and 11 at the loading completion position corresponds to the capstan 20. They are attached to the chassis 1 at an angle so that the angles are almost the same. Then, this inclined capstan 20 fully contacts the forward-inclined magnetic tape 13 that has been led obliquely upward from the winding side loading roller post 11, and when the loading operation is completed, the tape cassette 2
The magnetic tape 13 is pressed against the pinch roller 12 moving from the position of the notch 7, and is driven while holding the magnetic tape 13 between the pinch roller 12 and the pinch roller 12. At this time, the pinch roller 12 is configured to have the same slope as the capstan 20 so as to be in pressure contact with the capstan 20 over its entire surface. 22 is an audio control head provided near the capstan 20 between the second winding side loading roller post 11 at the loading completion position and the capstan 20; The magnetic tape 13 is provided on the chassis 1 so as to have the same inclination as the capstan 20 in order to make good contact with the magnetic tape 13 in a forward tilted position which is guided diagonally upward by the capstan 20 in an oblique path. Reference numeral 23 denotes an auxiliary guide post that moves in conjunction with the pinch roller 12. It is inserted into the notch 7 of the tape cassette 2 before loading starts, and when loading is completed, it moves together with the pinch roller 12 and connects the capstan 20 and the pinch roller. 12 guides the magnetic tape 13 being run towards the fixed inclined post 24. The magnetic tape 13 fed from the second winding side loading roller post 11 through the capstan 20 and the auxiliary roller post 23 in the same forward tilted position is transferred to the tape cassette 2.
A fixed tilt post 24 tilted and fixed to the chassis 1 in front of the tape corrects twisting of the tape when changing from an oblique path to a horizontal running path, and the tape is wound onto the take-up reel 4 of the tape cassette 2. 25 is a capstan motor that drives the capstan 20, and is installed at an angle on the chassis 1. This configuration is because the capstan 20 is provided outside the mounting position of the tape cassette 2.
This can be easily realized without increasing the thickness of the chassis 1.

Further, the loading operation will be explained in detail with reference to the drawings. 6 and 7 show the cam portion 37 of the cam gear 34
In the figure, the cam portion 37 of the cam gear 34 has a cam groove 37a in the circumferential direction, and the pinch roller 12 is pressed against the capstan 20 after loading is completed. It is composed of a bent cam groove 37b bent toward the center for performing a side pressing operation. 60 is cam gear 3
This is a pinch rod that operates in conjunction with the cam portion 37 of No. 4, and has a long hole 61 formed in the length direction at one end and a cam follower 62 that engages with cam grooves 37a and 37b formed in the cam portion 37. , the elongated hole 61 fits into the shaft 63 of the cam gear 34. The other end of the pinch rod 60 is connected via a pin 66 to one end of a first pinch charge arm 65 that is pivotally supported on a shaft 64 mounted on the chassis 1. is provided with a second pinch charge arm 68 whose intermediate portion is pivotally supported via a pin 67, and a spring 69 is interposed between one end of the first pinch charge arm 65 and one end of the second pinch charge arm 68. has been done. A pin 70 provided at the other end of the second pinch charge arm 68 is fitted into a long hole 73 at one end of a pinch arm 72 rotatably provided on the chassis 1 via a pin 71, and the pinch roller 12 The pinch arm 72 is provided at the other end with the same slope as the capstan 20.

As shown in the figure, the arm 74 is attached to the chassis 1.
One end is pivotally supported by a shaft 75 planted in the shaft 75, and an auxiliary guide post 23 installed at the other end with the same inclination as the capstan 20. Also, the arm 74 is connected to the link 7
6 to the pinch arm 72.

Next, the operation of pressing the pinch roller 12 onto the capstan 20 by further rotating the cam gear 34 clockwise after the loading operation is completed will be described. As shown in the figure, the cam follower 62 provided on the pinch rod 60 enters the bent cam groove 37b of the cam portion 37, pulls the pinch rod 60 in the direction of arrow (d), and moves the first pinch charge arm 65 to the shaft 64. The second pinch charge arm 68 is pushed out in the direction of arrow (G) by rotating clockwise around
The pinch arm 72 is rotated counterclockwise around the pin 71 to press the pinch roller 12 against the capstan 20.

At the same time, push the link 76 to rotate the arm 74 clockwise about the shaft 75, and move the auxiliary guide post 23 provided at one end of the arm 74 to the capstan 20.
and the fixed inclined post 24. This allows the capstan 2 to be moved from the winding side loading roller post 11 to the capstan 2.
The gradual diagonal path of the magnetic tape 13 that reaches zero is maintained.

0010

[Problem to be Solved by the Invention] A VTR with such a configuration handles an amount of information several hundred times that of an audio signal, so compared to an audio recorder, mounting precision on the order of microns is required for each guide post, pinch roller, capstan, etc. Even if they are automatically assembled on a factory line according to the design, the current situation is that the installation condition of each guide post, pinch roller, etc. must be adjusted (height adjustment) manually. In particular, guide posts placed at the end of the travel system (placed on the take-up side via the cylinder 19) are different from guide posts placed at the beginning (supply side), such as This results in large errors including installation errors of the tension post 9, loading roller post 8, etc.).

For example, FIG. 5 is a side sectional view of the auxiliary guide post 23 shown in FIG. 3, and since it is installed on the arm 74, which is a moving member, particularly high precision mounting is required. Conventionally, the mounting adjustment (height adjustment) has been achieved by restraining the post 23 at an appropriate position with a nut 51 using the elasticity of a spring 50 inserted inside, as shown in the figure. (The tip of the shaft of the post 23 is threaded).

However, depending on the degree of installation error of the post 23 (or installation error of the entire loading mechanism including the error of the supply side post), in order to adjust the error, the post 23 may be adjusted as shown in the figure. arm 74
There may be cases where the height has to be adjusted so that the magnetic tape 13 is held at a position considerably higher than the
When trying to apply tape tension again to this tape and attach it to the post 23, the magnetic tape 13 cannot be attached to the post 23 properly because the post is located far above the arm, and the magnetic tape 13 cannot be attached to the post 23 properly. Before reaching the tape, the tape comes into contact with the protrusion 23' at the bottom of the post (provided above and below the post to guide the magnetic tape during running), causing damage to the tape such as peeling off of the magnetic material.

In order to prevent such a situation, the shape of the protrusion of the post should be wider and oriented outward (towards the arm) in order to guide the tape from the arm so that the magnetic tape can be wound properly even when it is loose. It is conceivable to form the tape so that the inner angle of the protrusion is made larger, but with this configuration, the holding property (guiding property) during tape running becomes poor. It is also possible to leave the slope of the protrusion unchanged and make the protrusion itself larger and thicker towards the arm side, but in that case the distance between the arm and the post would be almost gone, making it almost impossible to adjust the height. .

The present invention is intended to solve this problem, and proposes a structure suitable from the point of view of tape protection when adjusting the heights of various guide posts, pinch rollers, capstans, etc.

[0015]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a plate-shaped elastic member having a slope between the arm post and the arm post.

[0016]

[Function] With the above configuration, when the magnetic tape loosens for some reason and comes off the post, when the tape is re-tensioned and attached to the post, the magnetic tape is guided by the slope of the elastic material, and the magnetic tape is guided to the bottom of the post. It can be attached to the post smoothly without getting caught on the protrusions.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing the structure of the auxiliary guide post 23 in one embodiment of the present invention, FIG. 2 is a side sectional view showing the positional relationship with the magnetic tape 13 (hereinafter abbreviated as tape), and FIG. FIG. 3 is a plan view of main parts showing the configuration near the auxiliary guide post 23. FIG.

In the figure, reference numeral 23 has the same shape as the auxiliary guide post 23 (hereinafter referred to as post) already shown in FIG. 3, and as shown in FIG. The tip is threaded and loosely fitted to the shaft 1' together with a U-shaped leaf spring 100 (an elastic member on a plate having an inclined surface), and is adjustable and fixed with a nut 51. Note that the leaf spring 100 has one end connected to the arm 7.
4 is removably attached.

Here, the reason why the spring 50 is inserted inside the post 23 is that the spring 50 is inserted into the post 23.
This is because the height of the VTR body can be reduced by the height of the spring 50 compared to configuring it to be located outside of the frame 3, which is advantageous in products that require a smaller size and thinner profile, such as a camera-integrated video. be.

In this configuration, the height of the post 23 is adjusted by the nut 51 using the elastic force of the spring 50, as in the conventional case.

According to this embodiment, when the tape 13 becomes loose for some reason and comes off the post 23, tape tension is applied again to wrap the tape 13 around the post 23, as shown in FIG. It is reattached to the post 23 by sliding on the slope of the square plate spring 100.

The key point here is the contact state of the U-shaped leaf spring 100 with the protrusion 23' of the post. That is, as shown in FIG. 2(A), the leaf spring 1 is shaped like a
Does it touch the protrusion 23' of the post in the middle of the slope of 00?
Alternatively, as shown in FIG. 2(B), the leaf spring 10 is
The point is whether the apex of 0 touches the protrusion 23' of the post. In this embodiment, as shown in FIG. 2(A), the plate spring 100 is configured to come into contact with the protrusion 23' of the post halfway along the slope. According to this configuration, the tape 13
slides on the slope of the leaf spring 100, and the protrusion 23' of the post
When it is attached to the post body via the arrow, it will sink once it passes the top of the leaf spring 100 as shown by the arrow, and then it will be attached while drawing a trajectory along the protrusion of the post 23. On the other hand, if the top of the leaf spring 100 is in contact with the protrusion 23' of the post as shown in FIG. ′ and the slope of the leaf spring 100, and there is a risk that the tape 13 may be damaged. Therefore, the bent-shaped leaf spring 10
It is desirable that the contact state between the spring 100 and the protrusion 23' of the post is such that the slope of the leaf spring 100 and the protrusion 23' of the post are in contact with each other, as shown in FIG. 2(A).

[0023] In this embodiment, the leaf spring 100 is shaped like a square. That's fine.

Further, in this embodiment, the spring 50 is provided inside the post 23 along with the leaf spring 100, but if the leaf spring 100 has sufficient elastic force, the spring 50 is not necessary. First, weight reduction can be achieved.

Further, in this embodiment, the fixed inclined post 23 on the take-up side as shown in FIG. 3 is used as an example of the post 23. It can be applied to everything that requires height adjustment, such as various posts on the supply side, pinch rollers, and capstans.

[0026]

Effects of the Invention The present invention provides an elastic member having a slope between a post and an arm to which the post is attached, so that when the tape loosens for some reason and comes off the post, the tape tension is applied again. When attaching the tape to the post, the tape slides on the slope of the elastic material without getting caught on the protrusion of the post and can be reattached smoothly to the post, making it extremely effective and easy to protect the tape. can be achieved.

[Brief explanation of the drawing]

[Fig. 1] An exploded perspective view showing one embodiment of the present invention.

[Figure 2] Side sectional view of the same embodiment

[Fig. 3] A schematic plan view for explaining the tape path in a conventional VTR.

[Figure 4] A perspective view showing the main parts of the tape path.

[Fig. 5] Side sectional view of the fixed inclined post in the conventional example

[Fig. 6] A plan view for explaining the pressing operation of the pinch roller in a conventional VTR.

[Fig. 7] A plan view for explaining the crimping operation of the pinch roller of the conventional example.

[Fig. 8] Plan view of main parts showing the configuration near the auxiliary guide post of this embodiment

[Explanation of symbols]

23 Post (auxiliary guide) 51 Nut 74 Arm 100 Leaf spring

Claims (1)

[Claims] 1. A guide post provided on a drive member for loading a magnetic tape into a rotary head cylinder and having a protrusion for guiding the magnetic tape, the protrusion of the guide post and the drive member. A magnetic recording/reproducing device in which a plate-shaped elastic member having an inclined surface is provided between the members and the inclined surface of the elastic member is always urged against the protrusion of the guide post by the elastic force of the plate-shaped elastic member.