JPH0652596B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for pulling out a tape from a magnetic tape cassette and recording / reproducing it.

<Prior Art> Most of the recording / reproducing apparatuses of this type, for example, DAT, use a rotary head. In this case, however, the number of heads that can be installed on the rotary drum is at most two, and therefore the number of channels can be increased. The number is also 2 channels.

By the way, in recent years, there is a demand in the market for those capable of simultaneous multi-channel recording / reproduction. Therefore, a DAT having a multi-channel structure has been developed by using a fixed magnetic head such as a magnetic thin film head. It was

In such a fixed magnetic head type DAT, a so-called dual capstan system in which a capstan for moving the magnetic tape at a constant speed and a pinch roller are provided on the magnetic tape supply side and the winding side, respectively. There is a DA of such a dual capstan system
At T, the timing at which the pinch roller presses the magnetic tape against the capstan may be different between the magnetic tape supply side and the winding side due to variations in parts.

In particular, when the timing on the supply side is faster than the timing on the winding side, the loop of the magnetic tape between both capstans becomes loose. In such a case, the magnetic tape winds around the capstan, or , The magnetic head may not be able to run under constant pressure,
It had a great adverse effect on the recording / reproducing performance.

<Object of the Invention> An object of the present invention is to solve the above-mentioned problems in a magnetic recording / reproducing apparatus for recording / reproducing by pulling out a tape from a magnetic tape cassette.

<Structure of the Invention> A characteristic structure of the present invention for achieving the above object is to provide a magnetic recording / reproducing apparatus which pulls out a magnetic tape from a magnetic tape cassette set at a predetermined position and causes the magnetic tape to travel alongside the capstan. The pinch roller is provided with two sets on the left and right corresponding to the supply side and the winding side of the magnetic tape, respectively, and two sets of left and right crimping mechanisms for respectively crimping the capstans of each set to the pinch roller are provided. The crimping mechanism comprises a pinch roller crimping lever having a pressing portion for pushing the pinch roller toward the capstan side at one end, and a pinch roller crimping drive lever for driving the pinch roller crimping lever in the pinch roller pressing direction, Both levers are mounted so as to be swingable around the same fulcrum axis, and are connected in the rotational direction by springs. At least one of the two crimping mechanisms has a timing adjustment for adjusting the timing of crimping the pinch roller to the capstan by adjusting the angle formed by the levers around the fulcrum axis in the initial state of the spring. There is a means provided.

<Example> Hereinafter, an example of the present invention is described in detail based on a drawing.

1 to 4 show each operation mode of a cassette loading portion in a magnetic head fixed system DAT as a magnetic recording / reproducing apparatus according to the present invention, and FIG. 6 is a VI-VI arrow in FIG. FIG. 8 is a schematic external perspective view of the whole state in the state of FIG.

The schematic structure of this loading site is the main chassis 8
A supply reel base 63 and a take-up reel base 64 are arranged side by side on the front part (lower part in the figure) of the magnetic tape cassette, and the left and right reel hubs in the cassette body 2 of the loaded magnetic tape cassette are drivably connected. The read-ahead head 55 and the recording head 5 are provided inside the main chassis 8 (upper part in the figure).
6, a head block 66 including a reproducing head 57 and guides 58, 59, 60, and a pair of left and right capstans 40, 41 are installed, and a pair of tape pull-out link mechanisms is provided on the left and right of the main chassis 8. ing.

Next, the structure of the tape pull-out link mechanism and its drive structure will be described.

On the supply side (left side) of the main chassis 8, a pinch shift arm 9 is attached rotatably around a fulcrum shaft 9a, and a pinch arm 10 equipped with a pinch roller 4 is attached to the fulcrum as a fulcrum. The pinch arm 10 is rotatably supported about 10a, and the pinch arm 10 is
It is always urged to rotate clockwise by a spring (not shown). A primary guide 6 is provided upright on the tip of the pinch shift arm 9.

Also on the winding side (right side) of the main chassis 8, a pinch shift arm 11 is provided on the main chassis 8 as a fulcrum shaft 11a.
Is rotatably attached to the pinch shift arm 11, and a pinch arm 12 having a pinch roller 5 is rotatably supported on a fulcrum 12a.
Moreover, the pinch arm 12 is constantly biased to rotate counterclockwise by a spring (not shown). A primary guide 7 is erected on the tip of the pinch shift arm 11.

On the right side of the main chassis 8, a loading rotary cam 1 for synchronously driving the left and right tape pullout link mechanisms is provided. Three cam grooves (not shown) are formed in the rotary cam 1, and the rotation of the rotary cam 1 causes three parts to be synchronously displaced and driven as will be described later.

In other words, when the rotary cam 1 rotates clockwise, the cam follower 13b provided on the pullout cam lever 13 is pushed outward in the radial direction along the cam groove, and as a result,
The pullout cam lever 13 rotates counterclockwise about a fulcrum 13d on the main chassis 8. In addition, along with this, the drawer exchange arm 16 and the tape drawer arm 20 on the winding side operate.

The drawer conversion arm 16 is rotatable in a balance-like manner around a fulcrum 16a on the main chassis 8, and a pin 16b provided at one end is interlocked with an elongated hole 13c formed in the drawer cam lever 13. The right end of the drawer actuating lever 17 is pivotally connected to the other end of the drawer conversion arm 16. The pull-out actuating lever 17 is extended to the supply side, and the linear elongated hole 17b formed on the extended end side is engaged with the guide 17a fixed on the chassis,
It can move left and right in a predetermined posture.

A drawer operating lever piece 18 is attached to the left end side of the drawer operating lever 17. The drawer actuating lever piece 18 is connected to the guide pin 17a via a linear oblong hole 18c while being connected to the drawer pin 18a fixed thereto and a long hole 17c on the drawer actuating lever 17 side so as to be movable relative to the left and right. Also, the posture is maintained by being engaged and guided. Further, a tension spring 19 is stretched over the drawer actuating lever 17 and the drawer actuating lever piece 18, and the drawer actuating lever piece 18 is pulled and biased with respect to the drawer actuating lever 17 to the rightward movement limit. The tension spring 19 is used for absorbing the stroke, which allows only the pullout actuating lever 17 to move rightward after the pullout actuating lever piece 18 moves rightward integrally with the pullout operating lever 17.

The tape pull-out arm 20 that is interlocked with the operation of the pull-out cam lever 13 is rotatable around a fulcrum 20a on the chassis, and is provided with a pull-out guide roller 20b having a tape guide flange at the top and bottom thereof. .

On the other hand, the tape pull-out arm 21 is also provided on the supply side. The tape pull-out arm 21 is rotatable around a fulcrum 21a on the chassis and has a similar pull-out guide roller 21b at its tip. The tape pull-out arm 21 is interlocked with the pin 18b provided on the pull-out actuating lever piece 18.

The second component driven by the rotating cam 1 is the sector gear 1.
It is 4. The fan-shaped gear 14 is mounted on the chassis and the support shaft 14
When the rotary cam 1 is rotated clockwise, the cam follower 14b is guided and moved in the cam rotation center direction by the cam groove, and the sector gear 14 is rotated counterclockwise.

A pair of left and right loading gears 22 and 23 meshing with each other are rotatably arranged in the middle of the left and right tape pull-out mechanisms via support shafts 22a and 23a, respectively, and the left (supply side) loading gear 22 has Fan-shaped gear 1
4 are in mesh. On the loading gears 22 and 23, there is a rotating member 2 which is rotatable relative to each other.
4,25 are pivotally supported and each loading gear 2
As shown in FIG. 5, a spiral winding for rotating the rotating members 24 and 25 integrally with the loading gears 22 and 23 is provided between the rotating members 24 and 25 and the rotating members 24 and 25. The springs 26 and 27 are interposed. The spiral springs 26 and 27 are for absorbing the overstroke of the loading gears 22 and 23 with respect to the rotation of the rotating members 24 and 25. The members 24 and 25 are in contact with each other at a predetermined relative rotation phase to be in an integrated state.

Loading arms 28 and 29 are rotatably attached to the support shafts 22a and 23a of the loading gears 22 and 23, respectively. Each loading arm 28,2
The operating shafts 28a and 29a fixed to the bottom surface of the chassis 9 are
Is extended downward through the arc-shaped elongated holes 28c and 29c and is engaged and connected to the free end grooves 24a and 25a of the rotating members 24 and 25, respectively, so that the rotating members 24 and 25 are rotated. It is adapted to be transmitted to the loading arms 28 and 29 on the upper part 8.

The free ends of the loading arms 28, 29 and the pinch shift arms 9, 11 are pivotally connected to each other via an elastically expandable / contractible relay link 30. The relay link 30 has one end pivotally connected to the loading arm 28 (29) via a pin 28b (29b) so as to be rotatable only, and the other end pivotally connected to the pinch shift arm 9 (11).
Of the link plate 30a connected to the pin 9b (11b) of the slot and the link plate 30b connected between the two pins in the opposite relationship to each other.
A tension spring 31 is stretched over 30b, and an overstroke of the loading arms 28, 29 with respect to the pinch shift arms 9, 11 is absorbed by the extension operation of the tension spring 31.

The third component driven by the rotary cam 1 is the pinch roller crimping link 15 (see FIGS. 3 and 4). The pinch roller crimping link 15 is rotatable about a fulcrum shaft 15d on the main chassis 8, and the cam follower 15a is guided and moved radially outward by a cam groove as the rotary cam 1 rotates clockwise. The pinch roller crimping link 15 is rotated counterclockwise. A connecting lever 32 is pivotally connected to one end of the pinch roller crimping link 15. A pinch roller crimping drive lever 33 is pivotally connected to the extension end of the connection lever 32 on the supply side.

In this embodiment, in order to prevent the loop of the magnetic tape 3 from being loosened due to variations in parts as in the conventional example, the timing at which the pinch roller 4 on the supply side presses the magnetic tape 3 against the capstan 40 can be adjusted. Is configured as follows.

That is, in a predetermined operation mode such as recording / playback, the capstan 4,5 of each set on the supply side and the winding side is
There are two sets of left and right crimping mechanisms for crimping to the pinch rollers 40 and 41 respectively. The crimping mechanism on the supply side of these two crimping mechanisms has a timing of crimping the pinch roller 4 to the capstan 40. An adjusting screw 39, which will be described later, is provided as a timing adjusting means for adjusting.

The two sets of crimping mechanisms basically consist of pinch roller crimping drive levers 33 and 35 and pinch roller crimping levers 34 and 36.
And a spring 37 that connects the two.

First, the crimping mechanism on the supply side will be described.

The supply side pinch roller pressing drive lever 33 is rotatable about a fulcrum shaft 33a on the chassis, and is urged to rotate clockwise by a spring (not shown). A pinch roller crimping lever 34 is rotatably attached to a fulcrum shaft 33a of the pinch roller crimping driving lever 33, and a spring 37 stretched between the pinch roller crimping driving lever 33 and the pinch roller crimping lever 34 is provided.
The pinch roller crimping lever 34 is urged to rotate counterclockwise until it hits the pinch roller crimping drive lever 3
Adjusting screw 39 as a timing adjusting means attached to No. 3
And is elastically integrated with the pinch roller pressing drive lever 33. In this case, after the pinch roller 4 is pressed against the capstan 40 and deformed to some extent, when the pinch roller crimping drive lever 33 further rotates, the spring 37 deforms and the tip of the adjusting screw 39 and the pinch roller crimping lever 34 are separated. A gap is generated between them, and the load (biasing force) of the spring 37 acts as a pinch pressure (pressing force) against the capstan 40. By moving the adjusting screw 39 forward and backward, both levers 33 around the fulcrum shaft 33a in the initial state are moved. It is possible to adjust the angle formed by the caps 40 of the pinch roller 4.
It is possible to adjust the pinch pressure to and the timing of crimping.

On the other hand, in the crimping mechanism on the winding side, the common fulcrum shaft 3
A pinch roller crimping drive lever 35 and a pinch roller crimping lever 36 are provided so as to be rotatable around 5a as a center, and both are integrally biased by a tension spring 37 so as to be relatively rotated. In addition, the pinch roller crimping drive lever 35 is constantly urged to rotate counterclockwise by the spiral spring 62, and the pinch roller crimping link 1
It is supported by abutting on an operating shaft provided at 5. Therefore,
The pinch roller crimping drive lever 35 and the pinch roller crimping lever 36 are integrally rotated clockwise in conjunction with the rotation of the pinch roller crimping link 15 in the counterclockwise direction. The function of the spring 37 provided between the levers 35 and 36 is the same as that on the supply side.

As described above, the pressure adjusting mechanism on the supply side is provided with the timing adjusting means capable of adjusting the timing of pressing the pinch roller 4 onto the capstan 40. Therefore, the timing adjusting means can adjust the timing on the supply side even if there are variations in parts. It is possible to effectively prevent the loop of the magnetic tape 3 from slackening by adjusting the timing of pressure bonding so as to be the same as or later than the winding side.

In this device, tape tension detecting means is provided on the supply side in order to stabilize the tape running.

That is, the guide plate 42 is fixed to the left side of the main chassis 8, and the fixed guide roller 43 with the upper and lower flanges is erected on the guide plate 42. In addition, the guide plate 42
Is provided with a sensor release arm 46 which is rotatable about a fulcrum 46a and is biased counterclockwise by a spiral spring 47. A pin 9c provided on the pinch shift arm 9 is biased and rotated. It is a stopper. Further, on the guide plate 42, the sensor spring 4 composed of a leaf spring is provided.
4 is cantilevered. The sensor spring 44 is normally elastically deformed by being pushed leftward in the drawing by the tip of the sensor releasing arm 46. Sensor spring 44
A detection piece 44a is provided on the rear surface on the free end side of the photocoupler, and a photocoupler 45 is installed on the guide plate 42 so as to sandwich the detection piece 44a with a predetermined gap.

Further, the drive unit of the rotary cam 1 is provided with position detection means for controlling the rotational position of the rotary cam 1.

As shown in FIG. 7, the gear portion 1 is provided on the outer periphery of the rotary cam 1.
a is formed, and a sensor gear 49 is meshed with and interlocked with the gear portion 1a via an intermediate two-stage gear 48. The upper surface of the sensor gear 49 is surface-treated with black, and silver fine wires 67 for position detection are radially formed on the upper surface with a predetermined angular phase. And the sensor gear 49
Photocouplers 65 are installed at a distance of 1 mm from the upper surface of the above, and the rotational position of the rotary cam 1 is detected by detecting the thin wire 67.

Since the fine wire 67 is required to have a particularly high precision, the black portion is made of a material that cannot be plated, and the fine wire 67 is
After the portion is made of a plateable material, the thin wire 67 portion is plated. According to such a configuration, there is no problem such as sticking error, sticking or peeling after sticking, which is seen in the means for sticking the label on which the predetermined pattern with the fine line is printed on the gear, and moreover, compared with the sticking process. Plating has the advantage that it can be done in a short time.

Next, a description will be given of the operation from the loading of the cassette body 2 to the pulling out of the magnetic tape 3 to the recording / playback mode (play mode).

(1) First state [Eject mode] (see FIG. 1) This first state is a state in which the cassette body 2 is loaded at a predetermined position of the apparatus, and when loading, a front lid opening / closing mechanism (not shown). ), The front lid is opened and the magnetic tape 3 can be pulled out. In this case, the pinch roller 4,
5, the primary guides 6 and 7, and the pull-out guide rollers 20b and 21b are located in a loop of the magnetic tape 3 which is substantially linear and is not pulled out.

When the rotary cam 1 rotates clockwise from this state, the drawer cam lever 13 rotates counterclockwise, the drawer exchange arm 16 rotates, the drawer operating lever 17 moves to the right, and the spring 19 moves. The pull-out actuating lever piece 18 also moves to the right through this, and the pull-out arm 21 rotates to move the pull-out guide 21b to the position shown in FIG. The drawer arm 20 rotates clockwise by the counterclockwise rotation of the drawer cam lever 13 accompanying the clockwise rotation of the rotary cam 1 and the drawer guide roller 20b.
Also moves to the position shown in FIG.

The clockwise rotation of the rotary cam 1 causes the fan gear 14 to rotate counterclockwise, the loading arm 28 to rotate clockwise, and the loading arm 29 to rotate counterclockwise. The movements of the loading arms 28 and 29 are transmitted to the pinch shift arms 9 and 11 via the relay links 30, respectively, and the left and right primary guides 6 and 7 are transmitted.
And the pinch rollers 4 and 5 move to the positions shown in FIG.

As described above, the pinch rollers 4 and 5, the primary guides 6 and 7, and the pull-out guide rollers 21b and 20b move outward from the cassette body 2 to pull out the magnetic tape 3. In this case, it is the pull-out guide rollers 21b and 20b that actually pull out the magnetic tape 3 out of the six points for locking the tape, and the other ones follow this.

(2) Second state [stop, fast forward, rewind mode]
(Refer to FIG. 2) When the magnetic tape 3 is pulled out to the position shown in FIG. 2, it is detected that the predetermined silver thin wire 67 of the sensor gear 49 has reached the corresponding position of the photocoupler 65 and has reached the stop mode. However, fast-forwarding and rewinding are also possible in this state.

In this state, the magnetic tape 3 pulled out of the cassette
Is only in contact with the pull-out guide rollers 21b and 20b and the pair of fixed guides 43.
Even if the car is driven at high speed, no unnecessary load or friction is applied. The fixed guide 43 and the pull-out guide roller 21b
Since the tape guides of 20b and 20b are rotating rollers, the load is extremely small.

Further, in this second state, the sensor release arm 46 pushes the sensor spring 44 leftward by the spring 47 to bend the sensor spring 44, so that the sensor pin 44b provided at the free end of the sensor spring 44 is separated from the magnetic tape 3. The load on the magnetic tape 3 that is fast forwarded or rewound is regulated.

When the rotary cam 1 further rotates in the clockwise direction from the second state, the drawer operating lever 17 further moves to the right, and the third
As shown in the figure, the pull-out arm 21 on the supply side rotates counterclockwise until it hits the stopper 50 on the main chassis 8. At this time, in order to properly secure the position of the pullout guide roller 21b on the pullout arm 21, an overstroke is given to the operating lever 17 after the pullout arm 21 hits the stopper 50, and this is elastically absorbed by the spring 19. To do.

Further, as the rotary cam 1 rotates, the pull-out arm 20 on the winding side also rotates and the pull-out guide roller 20b moves to the third position.
Move to the position shown in the figure. Further, the loading gears 28 and 29 swing out the pinch shift arms 9 and 11 forward by the counterclockwise rotation of the fan gear 14 accompanying the rotation of the rotary cam 1 to rotate the pinch shift arms 9 and 11, and the pinch rollers 4,5 and the primary guides. 6 and 7 move to the positions shown in FIG. At this time, the rotation of the pinch shift arms 9 and 11 is restricted by the stoppers 52 and 53 on the chassis, and the overstroke of the loading arms 28 and 29 is elastically absorbed by the relay link 30. When the pinch shift arm 9 rotates counterclockwise, the pin 9c on the arm 9 pushes and rotates the sensor release arm 46 clockwise, and the sensor spring 44 elastically restores to move the sensor pin 44b to the magnetic tape 3. From the outside.

(3) Third state [pause mode] (see FIG. 3) The magnetic tape 3 further pulled out in this way is fixed from the supply reel base 63 to the fixed guide 43, the sensor pin 44b, the pull-out guide roller 21b, the primary guide 6 and After being wound around the pre-reading head 55, the guide 59, the recording head 56, and the reproducing head 57 at a predetermined angle via the guide 58, the guide 60, the primary guide 7,
It leads to the take-up reel stand 64 via the pull-out guide roller 20 b and the fixed guide 43. Thus, in this third state, the magnetic tape 3 is loaded with the capstans 40, 4
Since it is separated from 1 and the pinch rollers 4 and 5,
It is possible to search by running the magnetic tape 3 at high speed.

Of course, the position detection in the third state is also based on the thin line detection of the sensor gear 49.

When the rotary cam 1 is further rotated clockwise from the third state, the cam follower 15 of the pinch roller crimping link 15 is rotated.
Only a moves from the center of the cam in the outer peripheral direction (the link 15 does not move between the first state and the third state). By rotating the pinch roller crimping link 15 in the counterclockwise direction, the pinch roller crimping lever 32 moves to the right, and the pinch roller crimping drive lever 33 rotates counterclockwise together with the pinch roller crimping lever 34. The roller 4 is pressed against the capstan 40, and the magnetic tape 3 is sent out at a constant speed.

Also on the winding side, the pinch roller crimp link 1
With the rotation of the pinch roller 5 in the counterclockwise direction, the pinch roller crimping drive lever 35 rotates clockwise with the pinch roller crimping lever 36, and the pinch roller 5 is moved through the pinch arm 12.
Is pressed against the capstan 41 and the magnetic tape 3 is sent out.

(4) Fourth state [play mode] (see FIG. 4) As described above, the magnetic tape 3 is pulled out and wound around all the heads, and the capstans 40 and 41 are
The pinch rollers 4 and 5 sandwich the pinch rollers to obtain a state in which the vehicle can run at a constant speed, and this state is detected by the photocoupler 65.

In this case, the tape running speed is stabilized by keeping the back tension of the magnetic tape 3 constant, and the means for this is as follows. When the back tension of the magnetic tape 3 changes, the force for bending the sensor spring 44 via the sensor pin 44b changes. The back tension can be made constant by detecting the bending amount of the sensor spring 44 by the photocoupler 45 and controlling the supply resistance of the supply reel base 63 so as to keep the bending amount of the sensor spring 44 constant. it can.

In the above-mentioned embodiment, the magnetic head fixed type DAT has been described, but the present invention is not limited to the DAT and can be similarly applied to other magnetic recording / reproducing devices.

<Effects of the Invention> As described in detail above, the present invention is a magnetic recording / reproducing apparatus provided with two sets of capstans and pinch rollers on the left and right sides corresponding to the magnetic tape supply side and the winding side, respectively. Thus, at least one of the left and right two crimping mechanisms for crimping the capstans of the respective sets to the pinch rollers is provided with the timing adjusting means for adjusting the timing of the crimping of the pinch rollers to the capstan. Even when the timing when the pinch roller presses the magnetic tape against the capstan moves back and forth between the supply side and the winding side of the magnetic tape due to variations in parts, etc., the timing adjustment means adjusts the timing of pressure-bonding on the supply side. It can be adjusted at the same time as or slower than the take side, which helps to loosen the magnetic tape loops. As a result, the recording / reproducing performance can be improved as compared with the conventional example.

[Brief description of drawings]

1 to 4 are plan views showing a main part of a digital audio tape recorder according to the present invention. FIG. 1 shows an eject mode (first state), and FIG. 2 shows a stop mode (second state). FIG. 3 shows a pause mode (third state), and FIG. 4 shows a play mode (fourth state). FIG. 5 is a longitudinal sectional view of the loading arm drive unit, FIG. 6 is a view taken along the line VI-VI in FIG. 4, FIG. 7 is a perspective view showing the position detecting unit of the rotary cam, and FIG. 8 is in the stop mode. It is the whole and schematic external perspective view. 3 ... magnetic tape, 4,5 ... pinch rollers, 40, 41
...... Capstan, 33a, 35a …… Support shaft, 33,3
5 …… Pinch roller crimping drive lever, 34,36 …… Pinch roller crimping lever, 37 …… Spring, 39 ……
Adjustment screw.

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for pulling out a magnetic tape from a magnetic tape cassette set at a predetermined position and adjoining a magnetic head for traveling, wherein a capstan and a pinch roller are provided on a magnetic tape supply side and a winding side. 2 sets of left and right corresponding to each of the above, and two sets of left and right crimping mechanisms for crimping each set of capstans to the pinch roller respectively, and each crimping mechanism presses the pinch roller at one end to the capstan side. And a pinch roller crimping drive lever for driving the pinch roller crimping lever in the pinch roller pressing direction.The both levers are swingable around the same fulcrum shaft. Mounted and rotationally coupled by a spring, at least one of the two sets of crimping A magnetic recording / reproducing apparatus provided with timing adjusting means for adjusting a timing of pressing the pinch roller to the capstan by adjusting an angle formed by the both levers around the fulcrum axis in an initial state of the spring. .