JPH05217257A - Tape loading mechanism of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate that a tape is run out of a cassette and sagged over the part longer than a specified length, by separately providing driving force transmitting routes of a 1st guide base member and a 2nd guide base member. CONSTITUTION:The driving force transmitting routes of the 1st guide base member 51 and the 2nd guide base member 52 are separately provided. So, the points where each positionally control member is controlled to position in place can be independently and easily set, then phenomena such that the tape is run out of the cassette and sagged over the part longer than the specified length subjecting to the effect of an inertia of reel table, etc., since so fat the 1st and 2nd guide bases are controlled to position in the place of each positionally controlled member almost at the same time after a loading is completed, are evaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism of a magnetic recording / reproducing apparatus such as a VTR, and more particularly, in the process of pulling a tape from a cassette to a predetermined position, it prevents slack in the tape and damage to the tape, and ensures stable operation. The present invention relates to a tape loading mechanism of a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art As described in, for example, Japanese Patent Laid-Open No. 2-21455, first and second guide base members for mounting a part of a tape guide member for pulling out a tape from a cassette at the time of tape loading, and Each driving member group that drives the two guide base members is mounted on a moving chassis that moves together with the cassette, and the driving motor that drives each driving member group is mounted on a fixed chassis that mounts a cylinder. ing. At this time, the transmission paths of the driving force for driving the first and second guide base members are substantially the same, and the first and second guide base members have substantially the same structure and method by the respective driving member groups. It is configured to be driven.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
This is very advantageous for simplifying the mechanism, but since the first and second guide base members are driven by the same method by the same driving force transmission path, the first and second guide base members are loaded. At the time of completion, the position of each position regulating member is regulated to a predetermined position at about the same time or at a slight deviation. Therefore, after loading is complete,
A phenomenon in which the tape is pulled out from the cassette to a length longer than a predetermined length due to inertia of the reel stand or the like is likely to occur, and a winding operation or the like for removing the slack of the tape may be required. Further, since it is substantially difficult to shift the time when the position of the first and second guide base members is regulated to the predetermined positions of the respective position regulating members, it is possible to shift the time when the position is regulated in this way. It is impossible to prevent the damage of the tape due to the deviation in the tape width direction at the time of loading. Furthermore, since the pressure-bonding operations of the first and second guide base members are started almost at the same time, the load at the time of loading sharply increases. Therefore, there is a problem that it is very difficult to secure the stability of the operation and the reliability against the tape slack and the damage to the tape.

In Japanese Patent Laid-Open No. 62-46458, although the driving paths of the first and second guide base members are the same, the catching timing is made different by utilizing the difference in the catching position. However, since the driving paths of the first and second guide base members are the same, a configuration for shifting the catching timing and the crimping timing of the first and second guide base members is disclosed. Is relatively troublesome, and it is difficult to set each catching time and crimping time independently.

The present invention has been made in view of the above points,
The purpose thereof is that the catching time and the crimping time of the first and second guide base members can be easily set independently of each other, so that the stability of the loading operation can be ensured and the slack of the tape An object of the present invention is to provide a tape loading mechanism of a magnetic recording / reproducing apparatus with high reliability against scratches on the tape.

[0006]

In order to achieve the above object, a tape loading mechanism of a magnetic recording / reproducing apparatus according to the present invention has a first guide base member and a first guide base member for driving the first guide base member. A drive member group that forms a drive path and a second guide base member and a drive member group that forms a second drive path that drives the second guide base member are separately provided to serve as a single drive source. The transmission paths of the driving force from the drive motor are separated.

[0007]

With the above-described structure, the time points at which the first and second guide base members are position-regulated at the predetermined positions of the respective position-regulating members can be easily set separately. The stability of operation and the reliability against slack of the tape and damage to the tape are significantly improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 6 by taking as an example a tape loading mechanism of a VTR in which a cylinder is overlapped with a cassette during tape loading to miniaturize the apparatus. To do. 1 is a plan view showing the tape loading mechanism before the start of the tape loading operation (unloading state), FIG. 2 is a plan view showing the tape loading mechanism at the end of the tape loading operation (loading completed state), and FIG. 3 is shown in FIG. FIG. 4 is a perspective plan view of an essential portion of the tape loading mechanism in the unloading state, FIG. 4 is a perspective plan view of an essential portion of the tape loading mechanism in the loading completed state shown in FIG. 2, and FIG. FIG. 6 is a perspective view as seen, and FIG. 6 is a perspective view of a main part of the tape loading mechanism as seen from below.

In FIGS. 1 and 2, 1 is a fixed first chassis (fixed chassis), and 2 is a second chassis (movable chassis) which is movable in parallel to the first chassis 1. .. A cylinder 6 having a magnetic head (not shown), a first position restricting member 92, a second position restricting member 76, and a capstan motor 9 are mounted on the first chassis 1.
Etc. are installed. A supply reel stand 4, a take-up reel stand 5, a drive motor 8 and the like are mounted on the second chassis 2, and a cassette 3 (shown by a chain double-dashed line in FIG. 1) can be mounted. .. The magnetic tape 7 sent out from the supply reel 4 in the cassette 3 has tape guide members 10, 11, 12, 13, 14, 15, 16, 17,
It is stably wound around the cylinder 6 by 18, 19, 21, 22 and is nipped between the pinch roller 20 and the capstan 9a to be driven and driven, and is taken up by the take-up reel 5 in the cassette 3.

As shown in FIGS. 3 and 4, the driving force of the drive motor 8 mounted on the second chassis 2 and serving as a power source for mode operation is transmitted through transmission gears 23, 24, 25 and 26, Gear and groove cam 27a mounted on the second chassis 2
Is transmitted to a cam member 27 having a gear and groove cams 28a and 28b. The transmission gears 23, 24, 25, 26 and the cam member 2 described above.
7, 28 are mounted on the second chassis 2. Here, the arrows in FIGS. 3 and 4 indicate the rotation and movement directions of the respective transmission mechanisms when the unloading state shifts to the loading completion state (during the loading operation).

The groove cam 28a of the cam member 28 has an intermediate portion 34 of an operation member 34 mounted on the second chassis 2 which functions as a drive arm for the second chassis 2.
c is engaged. One end 34b of the operating member 34
Is engaged with the long groove of the first chassis 1 by a pin-slot, and the other end 34a of the operating member 34 is rotatably supported on the second chassis 2. And in FIG.
The operation member 34 rotates about the other end portion 34a as shown by an arrow L in FIG. 3 according to the movement of each transmission mechanism indicated by an arrow in FIG. 4 during the loading operation. , Guided by the guide member on the first chassis 1 inserted in the long grooves 2a, 2b, 2c of the second chassis 2,
It moves in parallel to the first chassis 1 to change its relative position.

Next, the details of the tape loading mechanism will be described with reference to FIGS. As shown in FIGS. 3 to 6, a rack gear portion 104 is integrally formed on the second chassis 2 along the moving direction of the second chassis 2 during the loading operation. On the other hand, the drive gears 101, 102 and the crimp drive gear 103 are mounted on the first chassis 1, and the rack gear portion 104 and the drive gear 10 are mounted.
1 and 1 mesh with each other, thereby forming a driving force transmitting portion 130 (FIG. 5) from the second chassis 2 side to the first chassis 1 side. The crimping drive gear 103 has a spring member (not shown) for crimping built therein.

Further, on the first chassis 1, the first drive member 61 on the output side is provided with the rotation guide members 55, 56, 57, 58.
The gear portion of the first drive member 61 on the output side is gear-coupled to the pressure-bonding drive gear 103. On the delivery-side first drive member 61, a delivery-side second drive member 62 is rotatably supported around a rotation support shaft 68, and at the slit of the delivery-side second drive member 62. The amount of rotation is regulated by the engaging shaft 65 that is engaged. 63 is the third drive member on the output side,
Reference numeral 64 designates a fourth drive member on the output side, and the third drive member 6 on the output side.
3 and the output side fourth drive member 64 are rotatably supported by a support shaft 66 on the output side second drive member 62. The tape guide members 16 and 17 are mounted on the first guide base member 51, and the engagement shaft 51a on the first guide base member 51 is rotatable with respect to the third drive member 63 on the output side. The first guide base member 51 is rotatably supported on the output side third drive member 63. The tape guide member 18 is mounted on the third guide base member 53, and the engagement shaft 53a on the third guide base member 53 has the above-mentioned fourth drive member 6 on the output side.
4 is rotatably engaged with the third guide base member 53.
Is rotatably supported on the output side fourth drive member 64.

On the above-mentioned second chassis 2, the first entrance-side driving member 71, the entrance-side crimp spring member 75, the second entrance-side driving member 72, the third entrance-side driving member 73, and the entrance-side. The fourth drive member 74 and the entrance side guide member 70 are mounted. The first entrance-side driving member 71 is attached to the second chassis 2 so as to be movable back and forth, and its driven portion is engaged with the groove cam 28b of the cam member 28. The entrance-side second drive member 7 is movable back and forth with respect to the entrance-side first drive member 71.
2 are provided and the entrance side first and second drive members 71,
Numerals 72 are connected to each other by an inlet side pressure spring member 75.
Then, the rotational force of the cam member 28 is transmitted as a translational force to the first entrance-side drive member 71, and is further transmitted to the second entrance-side drive member 72 via the entrance-side compression spring member 75. The entry side third drive member 73 is rotatably supported by a turning support shaft 73a on the second chassis 2, and the entry side fourth drive member 74 is an entry side third drive member 73. It is rotatably supported by the upper rotation support shaft 73b. The tape guide members 14 and 15 are mounted on the second guide base member 52, and the engagement shaft 52a on the second guide base member 52 is rotatable on the entry side fourth drive member 74. Is supported by. In addition, before starting the tape loading operation, the second guide base member 52 is
Is mounted at a predetermined position on the entrance-side guide member 70.

Next, the operation of the tape loading mechanism of this embodiment will be described. As described above, during the tape loading operation, the drive motor 8 mounted on the second chassis 2
The driving force of the second chassis 2 causes the second chassis 2 to move in parallel with the first chassis 1 along the long grooves 2a, 2b, 2c of the second chassis 2. Along with this, as shown by the arrow in FIG. 5, the driving force of the second chassis 2 due to the parallel movement is transmitted via the transmission portion 130 to the driving gears 101, 102,
When transmitted to 103, each drive gear group rotates in the direction shown by the arrow in FIG. That is, the driving force from the second chassis 2 to the first chassis 1 is transmitted by the transmission portion 130, and the driving force is further transmitted to the output side first drive member 61, whereby the output side first drive is performed. The member 61 is shown in FIGS.
Inside it rotates as shown by the arrow.

The first guide base member 51 and the third guide base member 53, on which the tape guide members 16, 17, 18 are mounted, are attached to the cassette in accordance with the rotation operation of the first output side driving member 61. While pulling out the magnetic tape 7 from the supply reel 48 inside 3, the cylinder 6 is moved around the cylinder 6 along the first guide path 81 (shown by a broken line), and the first guide base member is started during the tape loading operation. 51 moves along the second guide path 82, and the third guide base member 53 moves along the third guide path 83. Then, the first guide base member 51
Is in contact with the first position restricting member 92, and the third guide base member 53 is in contact with the third position restricting member 69. The magnetic tape 7 is attached to the cylinder 6 by the position regulation of the member.
And the first and third guide base members 51,
Immediately before the completion of the movement operation of the second chassis 2, the compression 53 starts to be crimped by the compression drive gear 103 having a built-in compression spring (not shown), and the compression is completed at the same time when the movement operation of the second chassis 2 is completed. Further, each member mounted on the second chassis 2 moves in a direction approaching the cylinder 6 as the second chassis 2 moves, and accordingly, the tape mounted on the second chassis 2 The guide members 10 and 21 perform predetermined rotational movements and parallel movements, and are positionally regulated at predetermined positions.

Further, since the second guide base member 52 is mounted on the second chassis 2 as described above,
The second chassis 2 moves in a direction approaching the cylinder 6 as the second chassis 2 moves, and the groove cam 28b of the cam member 28 causes the first entrance side drive member 71 and the second entrance side drive member 7 to move.
2 moves in parallel, and the third driving member 73 on the entrance side and the fourth driving member 74 on the entrance side rotate, whereby the second guide base member 52 is guided by the guide member 70 formed on the entrance side. Groove 7
Moved under the guidance of 0a. The entry side guide member 70 receives the entry side position restricting member 76 after the movement operation of the second chassis 2 is completed.
Engage with. Then, the second guide base member 52 and the tape guide member 1 on the second guide base member 52.
After the movement operation of the second chassis 2 is completed, the reference numerals 4 and 15 are guided by a guide groove 76a formed in the entrance-side position regulating member (second position regulating member) 76 to perform a predetermined rotational movement and parallel movement. After the operation, the position is regulated by the entry side position regulating member 76, and then the pressure is applied by the entry side pressing spring member 75 to complete the crimping, whereby the tape loading operation is completed.

[0018]

As described above, according to the present invention, since the driving force transmission path of the first guide base member and the driving force transmission path of the second guide base member are provided separately, each position is different. It is possible to easily independently set the time when the position of the regulating member is regulated to the prescribed position, and the first and second guide bases are regulated to the prescribed positions of the respective position regulating members almost at the same time after the conventional loading is completed. Therefore, it is possible to avoid the phenomenon that the tape is apt to be affected by the inertia of the reel stand or the like and the tape jumps out from the cassette for a predetermined length or more and sags.

Further, the first and third guide base members 5
The driving member group that drives the first and the third guide base members 52 and the driving member group that drives the second guide base member 52 are independent of each other, and the movement and the position regulation of the guide base members 51 and 52 and the guide base member 53 are performed. Since it is possible to easily set the timing individually, it is possible to minimize the damage to the tape due to the twisting, the rising, and the falling of the tape during the tape loading.

Further, since the pressure-bonding periods of the respective guide base members can be set to be different from each other, it is possible to avoid a sudden mechanical load increase during the tape loading operation due to the simultaneous pressure-bonding of the guide base members, and it is highly reliable and stable. A tape loading operation is obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing a tape loading mechanism in an unloading state according to an embodiment of the present invention.

FIG. 2 is a plan view showing a tape loading mechanism in a loading completed state according to an embodiment of the present invention.

FIG. 3 is a perspective plan view of an essential part of the tape loading mechanism in the unloading state shown in FIG.

FIG. 4 is a perspective plan view of an essential part of the tape loading mechanism in the loading completion state shown in FIG.

FIG. 5 is a perspective view of an essential part of the tape loading mechanism according to the embodiment of the present invention as viewed from above.

FIG. 6 is a perspective view of the main part of the tape loading mechanism according to the embodiment of the present invention as seen from below.

[Explanation of symbols]

 1 1st chassis 2 2nd chassis 3 Cassette 6 Cylinder 7 Magnetic tape 8 Drive motor 51 1st guide base member 52 2nd guide base member 53 3rd guide base member 61 Exit side 1st drive member 62 Output side second drive member 63 Output side third drive member 64 Output side fourth drive member 70 Input side guide member 71 Input side first drive member 72 Input side second drive member 73 Input side third Drive member 74 Entry side fourth drive member 76 Second position regulating member 81 First guide route 82 Second guide route 83 Third guide route 92 First position regulating member 101 Drive gear 102 Drive gear 103 Crimping Drive gear 104 Rack gear part 130 Transmission part

Front page continued (72) Inventor Kenji Fuse, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside the Hitachi Media Visual Media Research Institute (72) Inventor, Seiichiro Nagai 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Inside Hitachi Media Media Research Laboratories

Claims (2)

[Claims] 1. A cylinder equipped with a rotary magnetic head, a tape guide member group for drawing a magnetic tape from a cassette and winding the magnetic tape around the cylinder to form a predetermined tape running path, and a tape guide member group. A first guide base member for mounting one or a plurality of tape guide members, and a first guide base member for the cylinder of the tape guide member group other than the tape guide member mounted on the first guide base member. A second guide base member that mounts one or a plurality of tape guide members on the opposite side of the one guide base member; and a drive member group that constitutes a first drive path that drives the first guide base member. , A drive member group forming a second drive path different from the first drive path for driving the second guide base member, and loading completion A position regulating member for regulating the position of the first guide base member at times, and a position regulating member for regulating the position of the second guide base member at the completion of loading, and the first guide base member at the completion of loading It is possible to independently set the time when the position regulating member is accommodated in the predetermined position and the position is regulated, and the time when the second guide base member is accommodated in the predetermined position of the position regulating member when the loading is completed. The tape loading mechanism of the magnetic recording / reproducing apparatus characterized in that 2. The period according to claim 1, wherein the first guide base member is in a predetermined position of the position regulating member and is crimped by a crimp spring or the like, and the second guide base member is the position regulating member. The tape loading mechanism of the magnetic recording / reproducing apparatus is characterized in that it is possible to independently set a period of being set at a predetermined position and being crimped by a crimping spring or the like.