JPS58203663A - Loading device - Google Patents

Abstract

PURPOSE:To improve easily the wow and flutter characteristics of a magnetic head, the accuracy of a revolution control signal for a rotary drum and the jitter characteristics of a reproduced picture, by selecting a contact point at a position where the vibration of a traveling tape does not affect so much a magnetic head or the rotary drum. CONSTITUTION:A mobile pin 22 is oscillated up to a prescribed position as soon as a disk 17 is turned, and a magnetic tape 10 is pressed to a guide pin 18 of the entrance side and an erasion head 21. A pinch roll 8 is finally revolved to press the tape 10 to a capstan 7. Then the tape 10 is pressed to a magnetic head 6, and the tape 10 starts its traveling. A contact point P2 of the head 6 is set between a pair of slanting pins 20 and 20, and furthermore the traveling route of the tape 10 is comparatively short between a contact point P3 and the exit end P1 of the tape winding route of a rotary rum 2. Therefore the extension and vibration of the traveling tape 10 are small and can be neglected at the point P2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loading device employed in a magnetic recording/reproducing device such as a video tape recorder, and more specifically, to a rotating drum having a built-in rotating magnetic head, which pulls out a magnetic tape from a tape cassette. This invention relates to a loading device for spreading a magnetic tape over a running path.

FIG. 1 shows an overview of a loading device in a general magnetic recording/reproducing device.

In FIG. 1, a rotating drum (2) with rotating magnetic heads (11, (11) installed at equal angular intervals on its outer circumference is
It is arranged on a board (3) at an angle of a predetermined angle, and on this board (3), there is a separate pair of inlet and outlet tape guides (4), f5), and audio signals and tape guides. A magnetic head (6) for recording and reproducing rotation control signals, a capstan (7) for running a magnetic tape, and its pinch roller (8) are arranged. Still, a set of supply and take-up reels 01) for winding the magnetic tape αe, and a tape cassette (9) with an opening held inside, have notches U3, 14), (to) formed in the round edge thereof. Inlet side tape guide (4) and outlet side tape guide (5) respectively.
, insert the capstan (7) into the board (3).
), and the magnetic tape side passes through the internal guide bin (16) and the head, and then connects to each of these notches (
1↓.

It now passes through En and Yuzuru.

During magnetic recording and reproduction, the pair of inlet and outlet tape guides (41, 5) have cutout portions (13),
+14), the magnetic tape in the non-set position is moved along the path indicated by the dotted arrow, and this magnetic tape [phase] is wound around the outer peripheral surface of the rotating drum (2) over an angle exceeding 18C1 degree. At the same time, the magnetic head (6) is pressed against the surface of the magnetic head (6), and the magnetic tape is held between the capstan (7) by a pinch roller (8). From this set position, it is returned to the non-set position again.

Here, in the conventional loading device as described above, the magnetic head (6) is located near the end of its traveling path, that is, between the exit side tape guide (5) and the capstan (7).
Since it is configured to contact the magnetic head between the magnetic head and the pinch roller (8), the magnetic head ( 6) The dimension up to the contact point P1 between the magnetic tape and the magnetic tape is relatively long9.
, this has a negative impact on the characteristics of the magnetic head (6) during recording and playback.◎Specifically, the single rotation drum (
2) The winding path of the magnetic tape (to) for K is the substrate (3)
The contact point P1t is tilted from the outlet end PI to the contact point P1t, which is corrected by the outlet side guide bin (5) so as to be parallel to the substrate (3). As the dimensions of the magnetic tape Uυ increase, the elongation and amplitude of the magnetic tape Uυ during running increases, which reduces the wow and flutter characteristics of the magnetic head (6), and also reduces the accuracy of the rotation control signal of the rotary drum (2). The jitter characteristics of the reproduced image deteriorate.

In addition, in the magnetic tape engraving system, the pair of inlet and outlet tape guides (4), t5) play an extremely costly role in loading the magnetic tape U onto the rotating drum (2). , O1 extension is still required for positioning the magnetic tape on the rotating drum (2). This is a rotating drum (
This is because the inlet and outlet tape guides +4) and +51 that regulate the running of the magnetic tape m in 2) are T movements, so if the positioning accuracy is poor, magnetic tape compatibility cannot be achieved. . Furthermore, it is necessary to interlock these tape guides with each other, and there are many difficulties in satisfying these conditions1.This invention aims to improve the deficiencies of the above-mentioned conventional loading device. It has been done.

That is, the present invention provides a magnetic head on a head arm provided near a rotating drum in order to bring the magnetic head into contact with the magnetic tape at the end of winding the magnetic tape on the rotating drum (end of loading). The head arm is vibrated so as to approach the rotating drum in time with the final stage of loading, and the winding path of the magnetic tape on the rotating drum is vibrated from the exit end of the winding path of the magnetic tape to the point of contact of the magnetic head with the magnetic tape. By setting the dimensions to be relatively short, it is possible to select the upper ml contact point at a position where the vibration of the magnetic tape during running does not have much effect on the magnetic head or rotating drum. be. Therefore, according to the present invention, the wow and flutter characteristics in the magnetic head, the accuracy of the rotation control signal for the rotating a-no drum, and the re! It is possible to easily improve the jitter characteristics and the like.

In addition, the present invention improves the degree of relative positioning of these by supporting a disk that is driven to reciprocate over a predetermined angle on a substrate, and providing a rotating drum and guide bins on the inlet and outlet sides on this disk. This is what I did.

Furthermore, the present invention provides a rotating drum at an eccentric position of the disk, and as the disk moves back and forth, the rotating drum is displaced in a direction opposite to the direction in which the magnetic tape is pulled out. This allows the tape to be loaded more reliably.

Next, one embodiment of the present invention will be described.

Figure 2 is a plan view showing the state before the tape cassette is loaded and the magnetic tape is pulled out, and Figure 8 is #4 of the main part of the loading mechanism seen from Figure 2.
1lAiI side view showing the formation, Figure 4 is Figure 2! V-IVp
FIG. 5 is a cross-sectional view of the tape cassette seen from the direction S, and a plan view showing a state in which the magnetic tape is pulled out.

In FIGS. 2 to 5, a disc-shaped disk 0η is supported on a substrate (3) and is driven to rotate over approximately 180 degrees around its rotation center 0.

This disk u7) has a rotating drum (2
) and a rotary head built therein are provided with a rotary drive device 1t (not shown), and a rotary drum (
2), an entrance side guide bin surround, an exit side guide bin/αl, and a pair of inclined bins JJ are installed.

Of these, the artificial side guide bottle l is set perpendicularly to the disk (17), and the outlet side guide bottle (to) is set at the same angle as the pair of wax oblique bottle threads. "Guide Bin" and Kenpei Bi/Yamayama are each magnetic tape α
It is formed in the shape shown in FIG. 8 so as to restrict the vertical position of O. (8) is an erase head used to erase the 1M number recorded on the magnetic tape.

(2) is a movable bottle that is installed on the arm example, and one end of the arm example is pivotally connected to the rotating tif function by the fixed shaft, so the movable bottle (support) can be rotated around the fixed axis. i1 ability. (25) The tape guide V is used to make the magnetic tape run parallel to the board (3), which runs at an angle to the board (3) in the Subunto bin. The pinch roller (8) is installed at one end of the frame of the pinch roller arm, and one end of the pinch roller arm □□□ is pivotally attached to the fixed pin (support) so that it can rotate.
The pinch row 2 (8) is rotatable around a fixed pin (support). The tape cassette (9) shown in FIG. 2 is shown with its top cover removed for convenience of explanation. The tape cassette (9) is equipped with a magnetic tape (1a), a supply reel, a take-up reel (opening) and a guide pin, and is configured to be removable from the base plate (3).

The tape cassette (9) is provided with a notch formed on the edge of the tape cassette (9). and a movable pin prisoner are located within this notch.

Here, the magnetic head (6) is a helad arm (support).
The head arm example is supported horizontally on the substrate (3) by means of a support pin (3). Further, this head arm (support) is provided near the rotating drum (2), and when the magnetic tape U is wound around the rotating drum (2) and loaded, as shown in FIG. The magnetic head (6) is arranged in such a way that it is compatible with the sound of the magnetic tape running between each other, and the magnetic head (6) has a pair of inclined bins. ni4i! It is designed to be touched. A stopper bin (9) is provided protrudingly on the base plate (3) corresponding to the swinging end of the head arm 4, and the head arm (support) is always held by this stopper bin C11) by the spring (support). In other words, the magnetic head (6) is biased in the direction in which it comes into contact with the loaded magnetic head (6). On the other hand, a cam surface (88 m ) is formed on the outer periphery of the disk (17), and this cam surface (
A cam roller (aab), which is made to follow 88a), is provided on the rad arm 4 mentioned above. This lifting platform, cam surface (88a)
A concave part (88c) is formed at the end of the disc 1, and when the disk αη rotates forward, the cam roller (88b) moves into this concave part (88b) by the bias of the spring (2) as shown in FIG. The head arm (support)
The swinging end portion of the swinging end comes into contact with the stopper bin (2) to restrict the swinging limit. On the other hand, when the disk arr is in forward or backward rotation, the spring ■
The cam roller (88b) is pushed out by the cam surface (88m) in a direction away from the rotation center 0 of the disk aη against the bias of 2) and the tilted bottle transfer to a position where it does not interfere with it. The above-mentioned support pin (to), spring (support), cam surface (88a
) and the cam roller (83b) constitute a swinging mechanism 9 for swinging the head arm (support), and the spring (2) is an example of an elastic member.

Next, when loading a magnetic tape during magnetic recording and reproduction, the disk αη first rotates in the direction of the arrow, the movable pin (support) swings in the direction of the arrow B almost simultaneously, and then the pinch roller (8) rotates. □, by swinging in the direction of arrow C. FIG. 6 shows a state in which the loading of the magnetic tape is completed in this manner. That is, the disk αη rotates approximately 180 degrees while pulling out the exit side guide pin, and the rotating drum (2) also moves from the position shown in Figure 2 to the position shown in Figure 5 and enters the notch in the tape cassette. Accordingly, magnetic tape is wrapped around the surface.

At the same time as this disk (19) moves back and forth, the movable bin (support) swings to a predetermined position, a magnetic tape decoy is pressed against the entrance side guide bin (Contact and Erase Head Co., Ltd.), and finally the pinch roller (8 ) rotates and the magnetic tape is pressed against the capstan (7), the magnetic tape is pressed against the magnetic head (6), and the magnetic head starts running.

In the magnetic tape running system configured in this way, as is clear from FIG. The dimension overflowing the magnetic tape running path between the contact point P1 and the exit end P1 of the magnetic tube winding path of the rotary drum (2) is relatively short.

Therefore, the above contact point P! The elongation and vibration of the magnetic tape 00 during running are so small that they can be ignored.As a result, 1. The precision of the rotation control signal for the rotating drum (2) by the magnetic head (6) is increased, and the wow and flutter characteristics and jitter characteristics during image reproduction are improved. Furthermore, the position of the magnetic head (6) is regulated by the head arm (support) urged by the spring (2) K coming into contact with the stopper pin 6υ, so its positioning must always be performed reliably at the same position. This facilitates the above effect and has an advantageous effect on the compatibility of the tape cassette (9).

Furthermore, the guides, bins (to) α9 and inclined bins (support) arranged around the rotating drum (2) regulate the traveling position of the magnetic tape wound around the rotating drum (2). In order to ensure compatibility between
Since both the disks Uη are fixed to the inclined pins and the rotating drum (2), it is easy to obtain the necessary mutual positional accuracy.

Note that the other movable parts, ie, the pinch roller (8) and the movable pin, are spaced apart from the rotating drum (2), so high precision is not required.

Note that the operating force for rotating the pinch roller (8) and the movable pin (support) can be extracted from the rotational driving force of the disk surface by the link, so that if the magnetic tape is not pulled out, the disk Oη is simply Since it is only necessary to provide a drive mechanism for rotating approximately 180 degrees, the mechanism can be simple.

As described above, according to the present invention, between the head arm provided with the magnetic head for recording and reproducing audio and rotation control signals and the disk provided with the rotating drum,
Although the structure is simple, consisting of a swinging mechanism for the head arm consisting of an elastic member such as a spring, a cam surface, and a cam roller, the vibration of the magnetic tape has the greatest effect on the magnetic head and rotating drum. It becomes possible to select the contact point of the magnetic head with respect to the magnetic tape so that its wow-7 rattling characteristics can be made good, and at the same time, the magnetic tape winding path on the rotating drum can be Since the length of the magnetic tape running path between the outlet end and the above contact point is shorter than that of conventional tapes, the elongation and vibration of the magnetic tape during running are reduced, and the rotation of the rotating drum by the magnetic head is reduced. The accuracy of the rotation control No. 18 for this purpose and the jitter characteristics during image reproduction are improved.

In addition, since the guide bins and rotating drums on the entrance and exit sides, which require a high degree of relative positioning accuracy, are all installed on a common magnetic head, the accuracy can be easily increased. When loading the magnetic tape, as the disk rotates back and forth, the rotating drum is displaced in the opposite direction to the direction in which the magnetic tape is pulled out, so that the rotation becomes more reliable.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an outline of a magnetic tape loading/loading mechanism of a conventional magnetic recording/reproducing apparatus, and FIGS. 2 to 5 are views showing one embodiment of a magnetic tape pulling mechanism according to the present invention. The figure is a plan view showing a state in which a tape cassette is attached and the magnetic tape is not pulled out. Figure 8 is a side view showing the configuration of the main parts of the tape pull-out mechanism as seen from line 1 in Figure 2, Figure 4 is a sectional view of the tape cassette seen from line ■-■ in Figure 2, and Figure 6 is a magnetic It is a plan view showing a state in which the tape is pulled out. (1)... Rotating magnetic head, (2)... Rotating drum, (3)... Substrate, (6)
...magnetic head, (7) ...pinch roller, (8)
... Capstan, (9) ... Tape cassette, Scream ... Magnetic tape, l1 ... Reel, (17) ...
Disc, (181... Entrance side guide bin, (11...
・・Exit side guide bin, kiln・head 3 arm,■・
・・Support biy, tsu・・sutotsuno (bin, (support)・
...Spring, (88a)...Cam surface, (aab)...Cam roller, (88C)...Concave portion In the drawings, the same reference numerals indicate the same or equivalent parts, respectively.

Claims (2)

[Claims] (1) A magnetic tape is pulled out from a nine-tape cassette that is attached to a board and accommodates two reels lined up at the same height, and the magnetic tape is held approximately 180 degrees on the surface of a rotating drum containing a rotating magnetic head. In the loading device, a disk is placed at an eccentric position on a substrate so that it can be driven to rotate reciprocatingly, and as the disk rotates forward and backward. The rotating drum is disposed so as to be displaced between a position close to the tape cassette and a position away from the tape cassette, and on the disk,
An exit side guide bin is provided to pull out the magnetic tape toward the exit end of the magnetic tape winding path on the rotary drum as the magnetic tape moves back and forth, and is also displaced toward a cut near the entrance end of the winding path as the drum moves back and forth. An entrance side guide bin is provided to guide the running of the magnetic tape, and a magnetic head for recording and regenerating prayers and rotation control signals for the rotating drum is provided on a head arm provided near the rotating drum. A loading device is provided with a swinging mechanism between the arm and the disk for swinging the arm so as to bring the magnetic head into contact with the magnetic tape at the end of the forward and backward movement of the disk. . (2) The swinging mechanism includes a support pin that supports the head arm so that it can swing forward and backward on the substrate, an elastic member that constantly urges the head arm so that the magnetic head approaches the center of rotation of the disk, and A loading device according to claim 1, comprising a cam surface formed on the outer periphery and a cam roller provided on the head arm and configured to follow the cam surface.