JPS6126151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a tape loading device that is most suitable for application to, for example, a VTR. The present invention relates to a tape loading device having a structure in which the tape is loaded.

As is well known, there are two mainstream tape loading systems for conventional VTRs: a U-type loading system and an M-type loading system. The M-type loading system uses two sets of tape pull-out guides and moves them to both sides of the rotating head drum to load the tape on the rotating head drum in an almost M-shape. This method uses a loading ring on which a pull-out guide is mounted, and as the ring rotates, the tape pull-out guide is moved along the outer circumference of the rotating head drum, thereby loading the tape on the rotating head drum in a roughly U-shape. .

By the way, in the M type loading system, fixed guides cannot be used to guide the tape entrance and exit to the rotating head drum.
The mold loading method has the advantage that fixed guides can be used as tape inlet and outlet guides, making it easier to run the tape stably with high precision. However, on the other hand, in the conventional U-type loading system, there is a fixed guide inside the loading ring.
A fixed head (CTL head, full-width erase head), capstan, etc. were arranged, and the outer diameter of the loading ring was extremely large due to the tape path. As the outer diameter of the loading ring increases, the planar area of the entire tape loading device increases in proportion. Furthermore, since the loading ring is inclined, an increase in its outer diameter also increases the height of the entire tape loading device. Furthermore, the chassis is also tilted as the loading is tilted. Conventionally, the capstan was placed at the lowest position of the tilted chassis, so the flywheel attached to the lower end of the capstan was placed at the lowest position of the chassis. It is placed further below the
As expected, the tape loading device had some defects, such as the height of the entire tape loading device being made too high.

The present invention was invented in view of the above-mentioned circumstances, and provides a tape loading device that makes use of the features of the U-shaped loading system while reducing the overall planar area and thickness of the device. This is what I am trying to do.

An embodiment in which the present invention is applied to a tape loading device for a VTR will be described below with reference to the drawings.

First, the entire tape loading device will be explained with reference to FIGS. 1 to 3.

Reference numeral 1 designates a cassette in which a supply reel 2 and a take-up reel 3 are housed in parallel, and a magnetic tape (hereinafter referred to as tape) 4 is wound between them.
This cassette 1 is positioned and placed horizontally on a horizontal mechanical board 5 of the VTR main body by a positioning mechanism (not shown), and a supply reel stand is placed in parallel on the mechanical board 5. The supply reel 2 and the take-up reel 3 are engaged with the take-up reel 6 and the take-up reel stand 7.

Reference numeral 9 denotes a rotating head drum (rotating magnetic head drum), which is mounted on the mechanical board 5 via a drum base 10 at a predetermined inclination angle. In this case, a rotating head drum 9 has a rotating drum 13 arranged between a pair of upper and lower fixed drums 11 and 12.
A plurality of rotating heads (rotating magnetic heads) 14 are attached to the outer periphery of a rotating drum 13.

A loading ring 16 is rotatably arranged around the outer periphery of the rotary head drum 9. This loading ring 16 is attached at a predetermined inclination angle to a slant chassis 17 fixed on the mechanical board 5, but its outer diameter is greatly reduced compared to the conventional one, and this loading ring Only a very small annular space 23 is left between the inner circumference of the ring 16 and the outer circumference of the rotary head drum 9. The loading ring 16 also has a pair of V grooves 1 formed between it and a ring base 18 fixed on the slant chassis 17.
It is supported by a bearing 22 having a structure in which a plurality of bearing balls 21 are incorporated between 9 and 20. The loading ring 16 is engaged with an outer gear 24 formed on its outer periphery, and is configured to be rotationally driven by a drive gear 25 driven by a loading motor (not shown). There is. The rotating drum 13 of the rotating head drum 9 is configured to be rotationally driven by a rotating head motor 26 directly connected to the lower part of the lower fixed drum 12.

A tape pull-out guide 28 is placed on the loading ring 16. This tape pull-out guide 28 is composed of a pair of rotating guides 29 and 30, which are connected to the loading ring 16.
It is rotatably supported on both ends of a rotating lever 32 which is rotatably attached to the top via a fulcrum shaft 31. 33 is a pinch roller, one end of which is rotatably supported on the other end of a second lever 35 which is connected to the rotating lever 32 via a pin 34.

37 is an entrance guide, 38 is an exit guide,
These are disposed within the space 23 at the tape inlet and outlet portions to the rotary head drum 9, and are fixedly mounted on the mechanical board 5. 39 is a capstan, and the loading ring 16 is mounted on the slant chassis 17 at a position outside the loading ring 16.
The shaft is rotatably supported almost at right angles to the shaft. This capstan 39 is placed at a sufficiently high position on the slope of the slant chassis 17 (for example, approximately midway between the top and bottom of the slope shown in the figure), and the flywheel 40 fixed to the lower end of the capstan 39 is It is housed in a substantially triangular space 41 below the slant chassis 17 on the mechanical board 5. The capstan 39 is configured to be rotationally driven by a capstan motor (not shown) via a flywheel 40. 42 is a CTL head for audio, and 43 is a full width erase head. These fixed heads are arranged outside the loading ring 16 as shown in the figure and are fixedly mounted on the mechanical board 5 or the like.
A tension regulator pin 44 is installed on the tip of a tension regulator arm 46 rotatably attached to the mechanical board 5 via a fulcrum shaft 45. Reference numeral 47 denotes a tension arm pin, which is installed on the tip of a tension arm 49 rotatably attached to the mechanical board 5 via a fulcrum shaft 48. The tension regulator arm 46 is biased to rotate clockwise in FIG. 1 by a tension spring 50, and the tension arm 49 is biased to rotate counterclockwise in FIG. 1 by a tension spring 51. ing. Further, the tension regulator arm 46 is interlocked via a spring 54 with a release arm 53 rotatably attached to the mechanical board 5 via a fulcrum shaft 52.

By the way, when the unloading of the tape 4 is completed, the loading ring 16 has returned to the state shown in FIG. They are placed one on top of the other. When the cassette 1 is mounted on both reel stands 6 and 7 in this state, a part of the loading ring 16 is located below the cassette 1 and is arranged on both sides of the front end opening within the cassette 1. The rotation guide 29 and the tension regulator pin 44 are inserted from below relatively to the inside of the tape 4 that is linearly passed between the pair of tape guides 55 and 56.

In this state, the loading motor starts rotating the loading ring 16 counterclockwise in FIG. 1, thereby starting the loading of the tape 4.

At this time, at the moment when the loading ring 16 starts rotating in the counterclockwise direction, the release arm 53
A roller 57 pivotally attached to the tip of the loading ring 16 is pushed up from a recess 58 provided on the outer periphery of the loading ring 16 to the outer periphery of the loading ring 16 as shown in FIG. Then, the release arm 53 is rotated counterclockwise in FIG. 1, and the tension regulator arm 46 is further rotated counterclockwise in FIG. 1 via the spring 54. As a result, the tension regulator pin 44 is pulled out from the position shown in FIG. 1 to the position shown in FIG. 2, and a portion of the tape 4 is pulled out of the cassette 1 by this pin 44 as shown in FIG. At this time, since no tension is applied to the tape 4, the tension regulator arm 46 comes into contact with a stopper pin 59 set on the mechanical board 5 as shown in FIG. 2 and stops.

On the other hand, as the loading ring 16 rotates counterclockwise in FIG. Further, as the loading ring 16 rotates in the counterclockwise direction,
A plurality of tape guides 66 and 67 installed on the rotating guide 30, the pinch roller 33, and the loading ring 16 pass under the tape 4 and enter the inside of the tape 4 one after another. They are hooked one after another. As the loading ring 16 rotates in the counterclockwise direction, the tape 4 pulled out of the cassette 1 is gradually wound around the circumferential surface of the rotary head drum 9.

Note that this winding is performed on the rotating lever 32 and the second
This is done while the lever 35 is disposed in a substantially arc shape within the rotation locus of the loading ring 16.

Loading of the tape 4 is completed by rotating the loading ring 16 to the position shown in FIG. The ring 16 falls into a recess 61 provided on the outer periphery of the ring 16 as shown in FIG. 2, and the tension arm 49 is rotated counterclockwise by the tension spring 51 as shown in FIG. Then, the switch lever 62 attached to the tension arm 49
operates the loading completion detection switch 63 mounted on the mechanical board 5. As a result, the loading motor is stopped, and at the same time, the protrusion 64 fixed to the loading ring 16 comes into contact with the stopper block 65 fixed to the mechanical board 5, and the rotation of the loading ring 16 is stopped. will be stopped. It should be noted that a reverse rotation prevention structure using a worm and a worm wheel (none of which are shown) incorporated in the drive path of the drive gear 25 by the loading motor, etc.
The loading ring 16 is locked in the above-mentioned stop position. Further, the tension arm pin 47 is pressed against the tape 4 due to the rotation of the tension arm 49 . The tension arm 49 is rotated to a position where its roller 60 enters the deepest part of the recess 61.

On the other hand, just before the loading of the tape 4 is completed, the rotating lever 32 is moved on the loading ring 16 by a guide mechanism to be described later.
The rotating guide 2 is rotated counterclockwise around the fulcrum shaft 31 so as to leave the rotational trajectory of the rotating guide 2.
9 and 30 are moved to the positions indicated by solid lines in FIG. Further, the pinch roller 33 is brought close to the capstan 39 by the rotation of the rotation lever 32.

When the loading of the tape 4 is completed as described above, the tape 4 is helically wound around the circumferential surface of the rotary head drum 9 at a predetermined angle of 180 degrees or more. At the tape inlet and outlet portions of the rotary head drum 9, the tape 4 is mounted on fixed inlet guides 37 and fixed outlet guides 38. Further, the tape 4 includes a tension regulator pin 44 and a tape guide 6 fixed on the mechanical board 5.
The full-width erasing head 43 is disposed outside the loading ring 16 between the full-width erasing head 43 and the loading ring 16.

Next, when the loading of tape 4 is completed,
When the FWD button is pressed, the pivot lever 32 is rotated to the position shown by the imaginary line in FIG. 2 and locked by a plunger mechanism, which will be described later. As a result, both rotating guides 29 and 30 are moved to both sides of the CTL head 42, and these rotating guides 29 and 30 move the CTL head 42.
The tape 4 is mounted on the CTL head 42 between them. Further, the second lever 35 is pulled by the rotation of the rotation lever 32, and the pinch roller 33 is brought into rolling contact with the capstan 39. And at the above moment tape 4
is run to perform desired recording or playback. Since tape tension is applied to the tape 4 during recording or reproduction, the tension regulator pin 44 operates at a position slightly displaced clockwise from the position shown in FIG.

The tape 4 can be unloaded by releasing the plunger mechanism (to be described later) using the rotary lever 32.
The process starts with the line being returned to the position indicated by the solid line in FIG. In this state, the loading ring 16 is rotated clockwise in FIG. 2 by the loading motor and returned to the position shown in FIG. is unloaded. In addition, just before the unloading is completed, the roller 57 of the release arm 53
falls into the recess 58 as shown in FIG. 1, and at this time, the unloading completion detection switch 69 mounted on the mechanical board 5 is operated by the clockwise rotation of the release arm 53 in FIG. As a result, the loading motor is stopped, and at the same time, the protrusion 64 comes into contact with the stopper block 70 fixed on the mechanical board 5, and the rotation of the loading ring 16 is stopped.

By the way, as shown in FIGS. 4A and 5, the fulcrum shaft 31 is press-fitted onto the loading 16, and a pair of bearings 73 are press-fitted above and below the fulcrum shaft 31. A lever 32 is rotatably attached. Furthermore, a pair of support shafts 74 and 75 are press-fitted onto both ends of the rotating lever 32, and a pair of bearings 7 are press-fitted into the upper and lower ends of the rotating lever 32, respectively.
6 and 77, the pair of rotation guides 29 and 30 are rotatably attached. Note that a roller 78 is rotatably pivotally attached to the upper end of the support shaft 74. Further, the pinch roller 33 is connected to the second lever 35.
It is rotatably attached to a support shaft 79 that is press-fitted thereon by a self-aligning structure. Also, the loading ring 1 is located at the bottom of the pinch roller 33.
A guide 81 having a guide groove 80 is fixed on the top of the support shaft 79, and the lower end of the support shaft 79 is connected to the guide groove 80.
inserted inside. Also loading ring 16
A return spring 84 is inserted between the pin 82 planted above and the pin 83 fixed on one end of the second lever 35.
has been erected. The return spring 84 biases the second lever 35 to the right in FIG. 4A, and rotates the rotary lever 32 clockwise in FIG. 4A. At this time, the lower end of the support shaft 79 comes into contact with the end of the guide groove 80, thereby regulating the positions of both levers 32, 35. Therefore, both levers 32 and 35 are arranged in a substantially arc shape within the rotation locus of the loading ring 16.

Next, the guide mechanism and plunger mechanism for rotating the rotary lever 32 will be explained with reference to FIGS. 4A to 6.

First, the guide mechanism includes a guide 86 for rotating the rotating lever 32 counterclockwise in FIG. 4A by contact with the roller 78, and one side 8 of the rotating lever 32.
7 and a guide 88 for returning the rotary lever 32 clockwise as shown in FIG. 4A. One guide 86 is fixed, for example, to a support base 89 of the CTL head 42 fixed on the mechanical board 5, and the other guide 88 is fixed on the mechanical board 5. Note that 90 is a stopper block fixedly fixed on the mechanical board 5, and the rotating lever 32 comes into contact with a regulating surface 91 formed on the stopper block, so that the rotation in the counterclockwise direction is regulated as shown in FIG. 4A. It is configured as follows.

Next, the plunger mechanism includes a plunger solenoid (hereinafter referred to as plunger) 93 mounted on the mechanical board 5, and a disc-shaped clamper rotatably supported on the mechanical board 5 via a fulcrum shaft 94. It consists of 95. One end of the movable iron core 96 of the plunger 93 is connected to one end of a slider 97 mounted on the mechanical board 5 via a pin 98, and a link 100 is connected to an eccentric position of the clamper 95 via a pin 99. The other end and the other end of the slider 97 are connected via a pin 101. Note that the clamper 95 is urged to rotate counterclockwise in FIG. 4A by a return spring 102 installed on the pin 101 and the like. A notch 104 for inserting a roller 103 pivotally attached to the lower end of the support shaft 75 is provided on the circumferential surface of the clamper 95.

A pressure roller 106 is provided inside the loading ring 16 and near the capstan 39.
is located. The pressure roller 106 is rotatably connected to one end of a link 108 rotatably supported on the mechanical board 5 via a fulcrum shaft 107, and the link 108 is attached to a pressure spring 109 that is stronger than the return spring 84. Therefore, it is rotated clockwise in FIG. 4A. Further, a slope 110 is provided on the inner surface of the second lever 35.

By the way, when the loading ring 16, which has been rotated counterclockwise in FIG. 1 during loading of the tape 4 described above, is rotated to the position shown in FIG. 4A, the rollers 78 come into contact with the guides 86. As the loading ring 16 continues to rotate counterclockwise, the roller 78 guided by the guide 86 is moved inside the loading ring 16. Due to this guiding action, the rotating lever 32 is moved onto the fulcrum shaft 31 on the loading ring 16.
Return the spring 8 counterclockwise in Fig. 4A with
rotated against 4.

When the loading ring 16 reaches the loading completion position shown in FIG. 2 and is stopped, the rotating lever 32 is rotated to the position shown in FIG.
It is inserted shallowly inside. Further, as the rotary lever 32 rotates, the pin 34 rotates the second lever 35.
is also pulled out to the position shown in Figure 4B, and the pinch roller 3
3 is brought close to the capstan 39.

Next, when the loading of tape 4 is completed,
When the FWD button is pressed, the plunger 93 is energized and its movable iron core 96 is pulled. Then, the clamper 95 is rotated counterclockwise via the slider 97 and the link 100 against the return spring 102 as shown in FIG. 4C. At this time, the roller 103 is hooked by the notch 104 of the clamper 95, and the rotating lever 32 is further returned counterclockwise around the fulcrum shaft 31 and rotated against the spring 84, as shown in FIG. 4C. become a state. At this time, the rotation lever 32
One end thereof is brought into contact with a stopper block 90 by means of a regulating surface 91, and the other end thereof is clamped by a clamper 95 to be locked in the state shown in FIG. 4C. By the rotation of the rotary lever 32, the two rotary guides 29, 30 are locked in a position where they just sandwich the CTL head 42, and the tape 4 is mounted on the CTL head 42 between them. At this time, the tape 4 is mounted on a tape guide 111 fixed on the mechanical board 5 between the CTL head 42 and the rotation guide 30.

Also, due to the rotation of the rotary lever 32, the pin 34
The second lever 35 is then pulled further.
At this time, the pressure roller 106 is attached to the slope 110.
is compressed by the spring force of the compression spring 109.
As a result, the second lever 35 is slightly rotated counterclockwise about the pin 34 as shown in FIG. 4C, and the pinch roller 33 is brought into rolling contact with the capstan 39.
Then, desired recording or playback is performed.

Note that when the STOP button is pressed during recording or playback operation, the power to the plunger 93 is cut off, and the clamper 95 is returned to the state shown in FIG. 4B by the return spring 102. As a result, the rotation lever 32 is also unlocked, and the rotation lever 32 and the second lever 35 are moved to the fourth position by the return spring 84.
The pinch roller 33 is moved back to the state shown in Figure B, and the pinch roller 33 is separated from the capstan 39.

Then, unloading of the tape 4 is started in the above state. At this time, loading ring 1
Immediately after the roller 6 starts to move back clockwise from the state shown in FIG. 4B, the roller 78 is released from the guide 86, while the guide 88 pushes up the side surface 87 of the rotating lever 32. As a result, the rotary lever 32, which has already been biased clockwise in FIG. 4B by the return spring 84, is smoothly rotated clockwise, and this rotary lever 32 and the second lever 35 are As shown in the figure, the ring is moved backward in a state where it is stacked in an arc shape on the loading ring 16.

By the way, according to the embodiment described above, fixed heads such as the capstan 39, CTL head 42, and full-width erase head 43 are arranged outside the loading ring 16, so that the outer diameter of the loading ring 16 is made larger than that of the conventional one. Shrunk to width. Therefore, the planar area of the entire device can be significantly reduced compared to the conventional device. Furthermore, since the outer diameter of the loading ring 16 is small, the height of the entire device, which is determined in relation to its inclination, can be significantly reduced (thinner) than in the past. Further, arranging the caster stand 39 at a sufficiently high position relative to the mechanical board 5 so that its flywheel 46 can be arranged on the mechanical board 5, etc., is also very helpful in making the entire device thinner.

However, regarding the tape path, the tape 4 is inserted into the entrance guide 37 at the tape entrance and exit portions.
Since the table 4 is mounted on fixed guides with the exit guide 38 and the exit guide 38, the table 4 can be run stably with extremely high accuracy on the circumferential surface of the rotating head drum 9. In particular, the positioning of the rotation guide 29 at the tape exit portion is related to tracking, and its rotation accuracy directly affects wow and flutter, but the loading ring 16 is supported by the bearing 22 without any wobbling in the vertical and horizontal directions. In addition, the rotating lever 32 is attached to the fulcrum shaft 31 press-fitted into the loading ring 16 via the bearing 73 without any wobbling, and the rotating guide 29 is attached to the supporting shaft 74 press-fitted into the rotating lever 32. The rotary guide 29 can be positioned with high precision because it is mounted via the bearing 76 in a state where there is no play and the rotating lever 32 is reliably locked in the state without play by the plunger mechanism. done. Further, the rotation guide 29 is rotated with high precision by the bearing 76. Also
The positioning of the tape 4 with respect to the CTL head 42 is also achieved with high precision by the rotating guide 29 and the fixed tape guide 111.

Further, a second lever 35 is connected to the rotary lever 32, and the second lever 35 is connected to the rotary lever 32 so that the second lever 35
Since the pinch roller 37 provided on the lever 35 is brought into rolling contact with the capstan 39, one plunger mechanism can rotate the rotary lever 32 to a predetermined position and rotate the pinch roller 33 to the capstan 39. The structure is very simple.

FIG. 7 shows a modified example, in which the rotary head motor is housed in the lower fixed drum 12, and the loading ring 16 is mounted on the drum base 114. The drum base 114 is rotatably supported via a pair of upper and lower bearings 115, and the drum base 114 is mounted on the slant chassis 1.
It was designed to be attached to 7. According to this structure, it is possible to further reduce the thickness of the entire device.

As described above, when the rotation of loading is completed, the rotary lever on the loading ring is rotated to position the pair of rotary guides on the rotary lever sandwiching the fixed head outside the loading ring. Since the second lever is linked to the rotation of the rotary lever and the pinch roller on the second lever is brought into contact with the capstan, the fixed head, capstan, etc. can be placed outside the loading ring. The outer diameter of the loading ring can be greatly reduced. Furthermore, since the outer diameter of the loading ring is small, the height determined in relation to the inclination of the loading ring can also be greatly reduced.

Moreover, when the loading ring rotates, the rotary lever and the second lever are placed within the rotation locus of the loading ring, and the rotary lever is moved within the rotation locus of the loading ring only when the loading ring finishes rotating. Therefore, it is necessary to provide a large space outside the loading ring in order to escape the rotary lever and the second lever that are moved as the loading ring rotates. Not at all.
Also, since the rotation lever and the second lever are placed within the rotation trajectory of the loading ring when the loading ring starts rotating, it is possible to position a part of the loading ring below the cassette. Therefore, the cassette can be mounted very close to the rotating head drum.

Furthermore, a second lever is connected to the rotary lever, and the second lever is linked to the rotation of the rotary lever so that the pinch roller on the second lever is brought into contact with the capstan. This makes it possible to place the capstan at a sufficiently high position relative to the chassis, etc., which is tilted as the loading ring inclines, and by placing the flywheel of the capstan above the chassis, etc. The height can be reduced.

Based on the above, while taking advantage of the features of the conventional U-shaped loading system (ability to move the tee stably with high precision), we aim to make the entire device smaller and thinner by reducing the flat area and height. This results in a very compact product.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a tape loading device for a VTR.
The figure is a plan view of the entire tape in a state where unloading of the tape is completed, FIG. 2 is a plan view of the entire tape in a state where loading is completed, FIG. An enlarged plan view of the main parts explaining the rotational driving situation of the moving lever,
FIG. 6 is a perspective view of the same as above, and FIG. 7 is a sectional view similar to FIG. 3 showing a modified example. Further, in the symbols used in the drawings, 4...Magnetic tape, 9...Rotating head drum, 16...Loading ring, 18...Ring base, 19,
20... V groove, 21... Bearing ball, 22...
Bearing, 28...Tape drawer guide, 29,
30...Rotation guide, 32...Rotation lever, 33
... Pinch roller, 35 ... Second lever, 37
...Entrance guide, 38...Exit guide, 39...
Capstan, 42...CTL head, 114...
...Drum base, 115...Bearing.

Claims (1)

[Scope of Claims] 1. A tape loading device in which a tape is pulled out from a cassette and loaded on a rotating head drum by a tape pull-out guide placed on a loading ring, wherein the tape pull-out guide is rotated by at least one pair of rotating wheels. A second rotary guide constituted by a guide and provided on a rotary lever supported on the loading ring, one end of which is connected to the rotary lever and a pinch roller provided on the other end. a lever is provided on the loading ring, and when the rotation of the loading starts, the rotary lever and the second lever are arranged in a substantially medium arc shape within the rotation locus of the loading ring, and the loading A portion of the ring and at least one of the pair of rotation guides are positioned below the cassette, and the rotation lever and the second lever are arranged in a substantially arc shape within the rotation locus of the loading ring. The loading ring is rotated while the loading ring is rotated, and only when the rotation of the loading ring is completed, the rotary lever is rotated so as to leave the rotation locus of the loading ring, and the pair of rotary guides are rotated in the loading position. The pinch roller is configured to be positioned so as to sandwich a fixed head disposed on the outside of the ring, and to interlock the second lever with the rotation of the rotary lever to bring the pinch roller into contact with the capstan. Tape loading device. 2. The loading ring that supports the rotary lever and the second lever is supported on a base via a bearing, and inside the loading ring there is a rotary head drum and a tape inlet/outlet for the rotary head drum. The tape loading device according to claim 1, characterized in that only a pair of fixed guides are arranged.