JPH0552583B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a broadcasting VTR in which a magnetic tape is wound around a rotating drum at an angle of 300 degrees or more and is caused to cross-traverse.
The present invention relates to a tape loading device suitable for use in magnetic recording/reproducing devices such as the above.

[Technical background of the invention and its problems]

There is a conventional loading device for a VTR constructed as shown in FIG. 1 (unloading state) and FIG. 2 (loading state). 1 and 2, 1 is a magnetic tape, 2 is a cassette, 3 is a supply reel, 4 is a take-up reel, 5 is a tension post, 6, 7 and 8,
9 are loading posts. During unloading, as shown in Figure 1, tension post 5, posts 6 and 7, post 8,
9 is placed between the magnetic tape 1 and the cassette 2 as shown. Therefore, during unloading, the magnetic tape 1 comes out of the supply reel 3 rotatably attached to the cassette 2, and is taken up as it is on the take-up reel 4 rotatably attached within the same cassette. During loading operation, tension post 5, post 6,
7, 8, and 9 move as shown by the dotted arrows in the figure, and pull out the magnetic tape 1 from the inside of the cassette 2 to the outside, resulting in the state shown in FIG. Thus, during loading, the magnetic tape 1 is transferred from the supply reel 3 to the post 10 to the tension post 5 to the post 11 to the erase head 12 to the impedance roller 13.
Post 6 → Post 7 → Rotating drum 14 → Post 8
→Post 9→Audio oil race head 15→Audio control head 16→Post 17→
It travels along the following path: capstan 18 and pinch roller 19 → take-up reel 4.

According to the apparatus having the above structure, the magnetic tape 1 can be wound around the rotating drum 14 up to about 180+10 degrees as shown in FIG. Therefore, it is fully usable for conventional VHS and β format VTRs. However, for example, in broadcasting VTRs, so-called α winding is performed with a winding angle of 300° or more as shown in Figure 4a and b, so in the above-mentioned loading device, the loading posts or the loading The ding arms etc. will collide with each other. For this reason, the above-mentioned loading device cannot be used with a VTR that performs the above-mentioned α winding, and the magnetic tape 1 is wound around the rotating drum 14 by hand, or a hard and flexible leader tape is inserted into the guide path of the rotating cylinder 14. This required a cumbersome operation in which winding was performed by pushing the wire into the hole. In addition, in Figure 4 a and b, 2
1 and 22 are guide posts for α winding.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape loading device that can automatically load the tape of an α-wound VTR, which could not be automated in the past.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration.

That is, in the present invention, a gear portion provided on the outer peripheral edge of the loading motor 40 and a gear 41 provided on the rotating shaft of the loading motor 40 is gear-coupled, and when the motor 40 rotates forward, the first
An annular loading plate 3 is arranged concentrically with a predetermined gap around the outer periphery of a rotating cylinder 34 in a magnetic recording/reproducing device so as to rotate in the direction of
5, and a gear part provided on the inner peripheral edge of the annular loading plate 35 is gear-coupled to the gear part provided on the outer peripheral edge of the annular loading plate 35 via a two-stage reduction gear 47 having a predetermined reduction ratio. Disposed concentrically with a predetermined gap with respect to the outer periphery of the annular loading plate so as to rotate in a second direction opposite to the rotational direction of the annular loading plate 35 during rotation. a circular arc-shaped loading plate 45A; and a mounting base 4 mounted on the circular loading plate 35 via a spring 75 so as to be elastically slidable along the circumferential direction of the circular loading plate 35.
4, and a pair of posts 4 placed on this mounting base 44.
A first loading leader 4 consisting of 2,43
2, 43, and a circumferential elongated hole 52 drilled in an ear portion 51 provided such that a support shaft 50 provided at one end thereof stands up from a predetermined portion of the peripheral edge of the arcuate loading plate 45A. A first tension spring 53 is installed between the support shaft 50 and the end of the elongated hole 52, so that it can be elastically slidably displaced along the circumferential direction. A second tension spring 54 is installed between a predetermined portion of the arcuate loading plate 45A and the end of the arcuate loading plate 45A.
It is attached to the distal end portion of the arc-shaped loading plate 45A so that it can be displaced in the axial direction while having a holding force to keep its main surface parallel to the main surface of the arcuate loading plate 45A due to the tension of the plate. A second loading leader 55, 56 consisting of a movable member 45B and a pair of posts arranged on the movable member 45B.
and the first and second loading leaders 42, 4.
3, 55, and 56 are controlled so as to pull out the magnetic tape while being separated from each other on one side of the rotary cylinder 34 at the start of loading, and at the end of loading, the magnetic tape is pulled out from the other side of the rotary cylinder 34. means for controlling the drive so as to perform cross winding of the magnetic tape while moving the magnetic tape close to each other on the sides; The arcuate roller is designed to avoid collision between the first and second loading leaders 42, 43, 55, 56 and allow the first and second loading leaders 42, 43, 55, 56 to run past each other. a deflecting means 60 having a tilting table 62 provided on the fixed substrate 61 in order to give a displacement to the deflecting plate 45 such that its rotation locus is inclined in the direction of the axis; After the first and second loading leaders 42, 43, 55, and 56 have passed each other, the rotation of the motor is stopped, and the first and second loading leaders 4
2, 43, 55, 56 and the mounting base 44
and a means 65 for mechanically blocking the movement of the movable member 45B.

[Embodiments of the invention]

FIG. 5 is a plan view showing an unloading state of one embodiment of the present invention, and FIG. 6 is a plan view showing the loading state of the same embodiment. Figures 5 and 6
In the figure, 31 is a magnetic tape, 32 is a supply reel, 33 is a take-up reel, and 34 is a rotating cylinder. An annular loading plate 35 is provided on the outer periphery of the rotating cylinder 34 and guide rollers 36, 3
It is rotatably held by 7 and 38. Each of the guide rollers 36, 37, and 38 has a groove on its circumferential surface, and this groove holds the inner circumferential edge of the annular loading plate 35 without wobbling. Thus, the annular loading plate 35 is rotatably held concentrically with the rotating cylinder 34. A gear is formed on the outer peripheral edge of the annular loading plate 35, and this gear meshes with a gear 41 provided on the shaft of a loading motor 40 via a transmission gear 39. Thus, when the loading motor 40 rotates counterclockwise as shown by the arrow in FIG. 5, the annular loading plate 35 also rotates counterclockwise as shown by the arrow.
On the annular loading plate 35, a first
Posts 42 and 43 as loading leaders
is attached via a mounting base 44. The posts 42 and 43 are located inside the magnetic tape 31 as shown in FIG. 5 during unloading.

Further on the outer periphery of the annular loading plate 35, an arcuate loading plate 45 can be rotated along a guide member 46 with a predetermined gap therebetween. As shown in FIG. 7, the arcuate loading plate 45 consists of a base portion 45A and a movable portion 45B connected to the base portion 45A, and a gear is provided on the inner peripheral edge of the base portion 45A.
The gear meshes with a gear provided on the outer peripheral edge of the annular loading plate 35 via a reduction gear 47. In this way, when the annular loading plate 35 rotates counterclockwise, the arcuate loading plate 45 engages the reduction gear 4.
7, and rotates in the opposite direction to the plate 35, that is, clockwise, as shown by the arrow in FIG. Note that the above-mentioned arc-shaped loading plate 4
5 is a guide gear 4 disposed on the rotation locus.
8 and 49, the inward movement is regulated and rotated.

As shown in FIG. 7, the movable portion 45B of the arcuate loading plate 45 is slidable and rotatable through a support shaft 50 provided at one end thereof into an elongated hole 52 provided in an ear portion 51 of the base portion 45A. It is inserted freely. A spring 53 applies a biasing force to one end of the elongated hole 52 (left end in the figure), and a spring 54 applies a tensile force to keep it parallel to the base portion 45A. Posts 55 and 56 as second loading leaders are installed on the upper surface of the movable part 45B,
A stopping post 57 is installed on the lower surface of the movable portion 45B. The posts 55, 56, etc. are located inside the magnetic tape 31 as shown in FIG. 5 during unloading.

In other words, during unloading, the fifth
As shown in the figure, the posts 42 and 43 as the first loading leader and the posts 55 and 56 as the second loading leader are both located inside the magnetic tape 31, and when loading the magnetic tape 31, is ready for withdrawal.

Thus, during loading, when the loading motor 40 is rotated in the direction of the arrow in FIG.
5 rotates counterclockwise in the figure. At the same time, gear 4
Since the rotational force is transmitted at a reduced speed to the arc-shaped loading plate 45 via the rotor 7, the plate 45 rotates clockwise in the figure. the result,
The magnetic tape 31 has posts 42, 43 and 55,
56 and wrapped around the outer peripheral surface of the rotating drum 34. When the posts 42, 43 and 55, 56 approach each other on the opposite side of the rotating cylinder 34, the movable portion 45B of the arc-shaped loading plate 45 is deflected in the axial direction of the rotating cylinder 34 by the deflecting mechanism 60. Driven.

As shown in FIG. 8, the deflection mechanism 60 includes a tilting table 64 having a convex portion 62 and a concave portion 63 on a substrate 61. Note that a stopper 65 having a V-shaped receiving portion is fixed to the end of the inclined table 64.

Therefore, now the arc-shaped loading plate 4
When the movable portion 45B of No. 5 reaches the inclined table 64 of the deflection mechanism 60, the lower end of the stop post 57 slides on the inclined table 64 along the uneven portion.
At this time, since the movable part 45B is applied with a tensile force downward in FIG. Finally, as shown in FIG. 8, when the stopping post 57 collides with the stopper 65, the forward movement of the movable portion 45B is stopped. At this time,
The loading motor 40 is stopped rotating by means described later, but the arc-shaped loading plate 45
The base portion 45A moves forward a little and then stops. Therefore, the spring 53 is stretched and its tensile force acts to press the stopper post 57 against the stopper 65. Therefore, a stable stopped state is exhibited.

On the other hand, the posts 42 and 43 mounted on the annular loading plate 35 move straight. After advancing to the designated position, the 9th
It is stopped by a stopping mechanism 70 shown in Figures a and b.
That is, the above-mentioned stopping mechanism receives a stopping post 73 protruding downward in the figure from a long hole 72 provided in the annular loading plate 35 by a stopper 71 having a V-shaped receiving portion installed on the board. It has become a thing. Note that a spring 75 is stretched between the stop post 73 and a pin 74 implanted in the annular loading plate 35. Therefore, the stop post 73 becomes the stopper 71.
When the annular loading plate 35 moves forward slightly until the rotation of the loading motor 40 is stopped by a motor stopping means described later, the spring 75 becomes in a stretched state. As a result, the stop post 73 is moved to the stopper 71.
It comes into pressure contact with the motor and stops in a stable state.

The motor stopping means includes reflective plates 81 and 8 provided on the annular loading plate 35 at a predetermined angle apart.
2, and a photo sensor 80 installed to receive the reflected light from these reflectors and send out a stop signal.
It is made up of. That is, during unloading, when the reflecting plate 81 reaches the installation position of the photo sensor 80, the photo sensor 80 detects the reflected light from the reflecting plate 81 and stops the rotation of the loading motor 40. Further, when the reflecting plate 82 reaches the installation position of the photo sensor 80 during loading, the photo sensor 80 detects the reflected light from the reflecting plate 82, and the loading motor 4
Stop the rotation of 0. In the above detection operation, a predetermined threshold is set for the light reception level of the photo sensor 80, and when light exceeding the threshold is received, it is assumed that the light is reflected from the reflectors 81 and 82. Let it be judged.

In this way, the magnetic tape 31 is wound around the rotating cylinder 34 as shown in FIG. 6, and is deflected by the deflection mechanism 60 on the reflective side of the rotating cylinder 34 to be in a cross state, and then stopped, so that so-called α winding loading is automatically performed. It is carried out in a regular manner.

As a result, the magnetic tape 31 travels along the following path. In other words, supply reel 32 → post 9
1 → Back tension post 92 → Post 93 →
Post 94 → Post 56 → Post 55 → Rotating drum 34 → Post 42 → Post 43 → Post 95 →
Audio oil race head 96 → audio control head 97 → post 98 → capstan 99 and pinch roller 100 → post 101 →
Take-up reel 33.

In the embodiment described above, by appropriately selecting the reduction ratio of the gear 47, the loading completion position can be selected at an arbitrary position. As a result, there is an advantage that the device can be made smaller.

Note that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

According to the present invention, the following effects can be expected.

(a) Two concentrically arranged loading plates, namely an annular loading plate and an arcuate loading plate, are configured to interlock via a two-stage reduction gear interposed between the two plates. This greatly simplifies the configuration of the rotational force transmission system. Moreover, by simply changing and setting the gear ratio of the two-stage reduction gear, it is possible to variably set the cross position and cross amount of the magnetic tape during α-wrap tape loading.
Therefore, the configuration can be simplified and a tape loading mechanism of any type can be easily realized.

(b) An arc-shaped loading plate is arranged concentrically around the outer circumference of the annular loading plate, and the empty space on the rotation trajectory of the arc-shaped plate is
Since the deflecting means having the tilt table and the stopper are provided, the installation space for each member is efficient and the device can be made compact.

(c) The mounting base is attached to the annular loading plate and the movable member is attached to the arcuate loading plate so that they can elastically slide, so that when the loading operation is completed, When the first and second loading leaders collide with each stopper, the impact force between each loading leader and each stopper is alleviated, and mechanical damage can be prevented from occurring. In addition, it is possible to absorb variations in the rotation stop position due to motor inertia when the motor rotation is stopped.
The second loading leader can be accurately and stably stopped at a predetermined stop position.

(d) In particular, the movable member is given a force to deflect it toward one end of the elongated hole by a first tension spring, and a tension force is applied to the movable member to keep it in a state parallel to the base part by a second tension spring. is given. Therefore, when the movable member of the arcuate loading plate reaches the ramp of the deflection mechanism, the lower end of the stop post is elastically brought into close contact with the ramp by the tensile force of the second tension spring. It will slide while maintaining its position. The forward movement of the movable part is stopped when the stop post finally collides with the stopper, but at this time, the stop post is elastically pressed against the stopper by the action of the first tension spring.

Therefore, the movable part not only finally exhibits a stable stopped state, but also operates throughout the entire movable range without causing any undesired vibrational displacement. Therefore, there is no risk that the tape will shift due to the undesired vibrations.

[Brief explanation of drawings]

1 and 3 are diagrams showing an example of a conventional tape loading device, in which FIG. 1 is an unloading state diagram, FIG. 2 is a loading state diagram, and FIG. 3 is a diagram of a loading state.
The figure shows the relationship between the rotating drum and the magnetic tape during loading, Figures 4a and b show the state of α winding loading, and Figures 5 to 9 a and b.
5 is a diagram showing an embodiment of the present invention, FIG. 5 is an unloading state diagram, FIG. 6 is a loading state diagram, FIG. 7 is a side view showing the structure of the arcuate loading plate, and FIG. 8 is an unloading state diagram. FIGS. 9a and 9b are diagrams showing the structure of the stop mechanism on the annular loading plate side. 31...magnetic tape, 32...supply reel, 3
3... Take-up reel, 34... Rotating cylinder, 35
... Annular loading plate, 41 ... Loading motor, 42, 43 ... Post (first loading leader), 45 ... Arc-shaped loading plate, 46 ... Guide member, 47 ... Reduction gear , 55, 56... Post (second loading leader), 60... Deflection mechanism, 70... Stop mechanism, 80... Photo sensor, 81, 82... Reflection plate, 91-95, 98, 101... …post.

Claims (1)

[Scope of Claims] 1. A loading motor 40 and a gear portion provided on the outer peripheral edge of the loading motor 40 are coupled to a gear 41 provided on a rotating shaft of the loading motor 40. 1
An annular loading plate 3 is arranged concentrically with a predetermined gap around the outer periphery of a rotating cylinder 34 in a magnetic recording/reproducing device so as to rotate in the direction of
5, and a gear part provided on the inner peripheral edge of the annular loading plate 35 is gear-coupled to the gear part provided on the outer peripheral edge of the annular loading plate 35 via a two-stage reduction gear 47 having a predetermined reduction ratio. Disposed concentrically with a predetermined gap with respect to the outer periphery of the annular loading plate so as to rotate in a second direction opposite to the rotational direction of the annular loading plate 35 during rotation. a circular arc-shaped loading plate 45A; and a mounting base 4 mounted on the circular loading plate 35 via a spring 75 so as to be elastically slidable along the circumferential direction of the circular loading plate 35.
4, and a pair of posts 4 placed on this mounting base 44.
A first loading leader 4 consisting of 2,43
2, 43, and a circumferential elongated hole 52 drilled in an ear portion 51 provided such that a support shaft 50 provided at one end thereof stands up from a predetermined portion of the peripheral edge of the arcuate loading plate 45A. A first tension spring 53 is installed between the support shaft 50 and the end of the elongated hole 52, so that it can be elastically slidably displaced along the circumferential direction. A second tension spring 54 is installed between a predetermined portion of the arcuate loading plate 45A and the end of the arcuate loading plate 45A.
It is attached to the distal end portion of the arc-shaped loading plate 45A so that it can be displaced in the axial direction while having a holding force to keep its main surface parallel to the main surface of the arcuate loading plate 45A due to the tension of the plate. A second loading leader 55, 56 consisting of a movable member 45B and a pair of posts arranged on the movable member 45B.
and the first and second loading leaders 42, 4.
3, 55, and 56 are controlled so as to pull out the magnetic tape while being separated from each other on one side of the rotary cylinder 34 at the start of loading, and at the end of loading, the magnetic tape is pulled out from the other side of the rotary cylinder 34. means for controlling the drive so as to perform cross winding of the magnetic tape while moving the magnetic tape close to each other on the sides; The arcuate roller is designed to avoid collision between the first and second loading leaders 42, 43, 55, 56 and allow the first and second loading leaders 42, 43, 55, 56 to run past each other. a deflecting means 60 having a tilting table 62 provided on the fixed substrate 61 in order to give a displacement to the deflecting plate 45 such that its rotation locus is inclined in the direction of the axis; After the first and second loading leaders 42, 43, 55, and 56 have passed each other, the rotation of the motor is stopped, and the first and second loading leaders 4
2, 43, 55, 56 and the mounting base 44
and a means 65 for mechanically preventing movement of the movable member 45B. A tape loading device for a magnetic recording/reproducing device.