JPH02101666A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the wear of a magnetic head, the winding irregularity of a magnetic tape or the like at the time of fast-forwarding or rewinding by executing the fast-forwarding and the rewinding of the magnetic tape in the state that the magnetic tape is not brought into contact with the magnetic head, a pinching roller and a capstan. CONSTITUTION:Under the state that a cassette main body 2 is loaded in a prescribed position, when a rotary cam 1 is rotated clockwise, a tape drawing arm 21 is rotated and a drawing guide 21b is moved to the position of a figure. Simultaneously, a tape drawing arm 20 is rotated clockwise and a guide roller 20b is also moved to the position of the figure. By these operations, the magnetic tape 3 is drawn to the position of the figure. Thus, the magnetic tape 3 only comes into contact with the rollers 21b and 20b and a pair of guides 43. As the result, even when the tape 3 is made to travel at a high speed, dead load or the wear are imposed on a device because the tape 3 does not come into contact with the magnetic heads 55 - 57, the pinching rollers 4 and 5 and the capstan.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an apparatus for pulling out a tape from a magnetic tape cassette and recording and reproducing it.

<Prior Art> Many of this type of recording and reproducing devices, such as DAT, use a rotating head, but in this case, the number of heads that can be installed on the rotating drum is at most two, and therefore the channel There are also two channels.

Incidentally, in recent years, there has been a demand in the market for simultaneous recording and reproduction of multiple channels, and as a result, DATs have been developed that utilize fixed magnetic heads such as magnetic thin-film heads to increase the number of channels. Ta.

However, the conventionally proposed fixed magnetic head type DAT
In this case, the magnetic tape running mechanism is basically the same as that of a general analog audio tape recorder, and in each mode of fast forward (FF') and rewind (REW), the magnetic tape pulled out from the magnetic tape cassette is It was designed to run at high speed while in contact with the magnetic head.

Therefore, during fast forwarding or rewinding, the magnetic head is easily worn out, and the tape runs unsteadily due to contact resistance with the magnetic head, resulting in some winding irregularities. When increasing the number of channels as described above, the head thickness of each channel and the track width of the magnetic tape are extremely small.
Wear of the magnetic head and irregular winding of the tape had a significant negative impact on recording and reproducing performance.

<Objective of the Invention> An object of the present invention is to solve the above-mentioned problems in a magnetic recording and reproducing apparatus that records and reproduces data by pulling out a tape from a magnetic tape cassette.

<Structure of the Invention> The characteristic structure of the present invention for achieving the above object is a magnetic recording system in which a magnetic tape is pulled out from a magnetic tape cassette set at a predetermined position by a tape pull-out link mechanism and runs alongside a magnetic head. In the playback device, the tape pull-out link mechanism includes a tape pull-out arm and a pinch shift arm, and a pinch arm equipped with a pinch roller is provided at a midway portion on the tip side of the pinch shift arm. In the first state in which the magnetic tape is not pulled out from the magnetic tape cassette, the tip guide of the tape pull-out arm and the pinch roller face into the loop of the magnetic tape, and the tip guide of the tape pull-out arm pulls the magnetic tape out of the magnetic tape cassette. By pulling the magnetic tape forward to the left and right, the magnetic tape is held in the second state for high-speed running where it does not come into contact with the magnetic head, pinch roller, or capstan, and the tip guide of the pinch shift arm moves the magnetic tape further than the second state. By pulling it forward, the magnetic tape is held in a third state in which it contacts the magnetic head but does not contact the pinch roller and the capstan;
As the pinch arm swings on the pinch shift arm, the pinch roller presses the magnetic tape against the capstan.
The point is that the magnetic tape is held in a fourth state in contact with the magnetic head, pinch roller and capstan.

<Example> Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 to 4 show each operation mode of the cassette loading section in a magnetic head fixed type DAT as a magnetic recording/reproducing device according to the present invention, and FIG. The perspective view, FIG. 8, is a schematic external perspective view of the entire device in the state shown in FIG. 2.

The general configuration of this loading part is the main chassis 8.
A supply reel stand 63 and a take-up reel stand 64 are arranged side by side at the front part (lower part in the figure) of the magnetic tape cassette to driveably connect the left and right reel hubs in the cassette body 2 of the loaded magnetic tape cassette. , a read-ahead head 55 and a recording head 56 are located deep inside the main chassis 8 (upper part in the figure).
, a head block 66 consisting of a playback head 57 and guides 5g, 59, 60, etc., and a pair of left and right capstans 40, 41 are installed, and a pair of tape pull-out link mechanisms are provided on the left and right sides of the main chassis 8. There is.

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

A pinch shift arm 9 is attached to the supply side (left side) of the main chassis 8 so as to be rotatable about a fulcrum shaft 9a. The pinch arm 10 is rotatably supported around the pinch arm 10a, and is always urged to rotate clockwise by a spring (not shown). Furthermore, a primary guide 6 is provided upright at 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 connected to a fulcrum shaft 11a provided on the main chassis 8.
The pinch arm 12 provided with the pinch roller 5 is pivotally supported on the pinch shift arm II so as to be rotatable around the fulcrum 12a.
Moreover, the pinch arm 12 is always urged to rotate counterclockwise by a spring (not shown). Further, a primary guide 7 is provided upright at the tip of the pinch shift arm 11.

A loading rotary cam 1 is provided on the right side of the main chassis 8 for synchronously driving the left and right tape pull-out link mechanisms. Three cam grooves (not shown) are formed in this rotating cam 1, and the rotation of the rotating cam 1 causes three components to be synchronously displaced as described later.

That is, when the rotary cam 1 rotates clockwise, the cam follower 13b provided on the pull-out cam lever 13 is pushed outward in the radial direction along the cam groove.
The pull-out cam lever 13 rotates counterclockwise about a fulcrum 13d on the main chassis 8. At the same time, the drawer conversion arm 16 and the tape drawer arm 20 on the winding side operate.

The drawer conversion arm 16 is rotatable in a scale-like manner about a fulcrum 16a on the main chassis 8, and a pin 16b provided at one end is engaged and interlocked with a long hole 13c formed in the drawer cam lever 13.

The right end of the drawer operating lever 17 is pivotally connected to the opposite end of the drawer conversion arm 16.

The drawer operating lever 17 is extended toward the supply side, and can be moved left and right in a predetermined posture by engaging a straight elongated hole 17b formed on the extending end side with a guide 17a fixed on the chassis. It has become.

A drawer actuating lever piece 18 is attached to the left end side of the drawer actuating lever 17. The drawer actuation lever piece 18 is connected to the guide 17a via a stepped pin 18a fixed thereto and an elongated hole 17c on the side of the drawer actuator lever 17 so as to be movable from side to side. It is also engaged and guided to maintain its position. Further, a tension spring 19 is stretched across 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. This tension spring 19 is used to absorb a stroke that allows only the drawer actuating lever 17 to move to the right after the drawer actuating lever piece 18 moves to the right together with the drawer actuating lever 17.

The tape pull-out arm 20, which is linked to the operation of the pull-out cam lever 13, is rotatable around a fulcrum 20a on the chassis, and has a pull-out guide roller 20b provided with upper and lower flanges for guiding the tape at its tip. .

On the other hand, a tape pull-out arm 21 is also provided on the supply side. This tape pull-out arm 21 is rotatable about 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 engaged with and interlocked with a pin tab provided on the pull-out operation lever piece 18.

The second part driven by the rotating cam l is the sector gear 1.
It is 4. This fan-shaped gear 14 is connected to a support shaft 14 on the chassis.
When the rotating cam l rotates clockwise, the cam follower 14b is guided by the cam groove toward the center of rotation of the cam, and the sector gear 14 is rotated counterclockwise.

A pair of left and right loading gears 22 and 23 that mesh with each other are rotatably disposed between the left and right tape pull-out mechanisms via support shafts 22a and 23a, respectively. Fan-shaped gear!
4 are engaged.

On each loading gear 22.23, a rotary member 24.25 that can rotate relative to each other is pivotally supported, and each loading gear 22, 23 and each rotary member 2
4.25, a helical spring 26.27 is interposed between the rotating member 24.25 and the loading gear 22.25, as shown in FIG. ing. Note that this helical spring 26.27 is for absorbing the overstroke of the loading gear 22.23 with respect to the rotation of the rotation member 24.25, and under normal conditions, each loading gear 22.23 and each rotation The members 24 and 25 are brought into contact with each other at a predetermined relative rotational phase and are in an integrated state.

A loading arm 28.29 is rotatably attached to each support shaft 22a, 23a of the loading gear 22.23. Each loading arm 28.2
The operating shafts 28a and 29a fixed to the lower surface of the chassis 8
are extended downward through arcuate elongated holes 28c and 29C, and are engaged and connected to the free end grooves 24a and 25a of each rotating member 24 and 25, so that the rotation of the rotating members 24 and 25 is controlled by the chassis. 8 to the loading arm 28, 29 on top.

The free ends of each loading arm 28, 29 and the pinch shift arms 9, 11 are pivotally connected via an elastically expandable relay link 30, respectively. One end of the relay link 30 is pivotally connected to the loading arm 2B (29) via a pin 28b (29b), and the other end is connected to the pinch shift arm 9 (11).
The link plate 30a connected to the pin 9b (llb) with a long hole and the link plate 30b connected between both bins in the opposite relationship are stacked, and both link plates 3Qa,
30b, the tension spring 31 is stretched over the length of the pinch shift arm 9.11, and the overstroke of the loading arm 28.29 against the pinch shift arm 9.
It is absorbed by the stretching action of 1.

The third component driven by the rotary cam l is the pinch roller crimp link 15 (see FIGS. 3 and 4). This pinch roller crimping link 15 is rotatable around a fulcrum shaft 15d on the main chassis 8, and as the rotary cam l rotates clockwise, the cam follower 15a is guided and moved outward in the radial direction by the cam groove. 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 supply side extending end of the connection lever 32 .

The pinch roller crimping drive lever 33 on the supply side 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 the fulcrum shaft 33a of the drive lever 33, and a spring 37 tensioned between the drive lever 33 and the crimping lever 34 causes the crimping lever 34 to move counterclockwise until it hits. Adjustment screw 3 attached to drive lever 33 with rotation bias
It contacts the tip of 9, drives it, and is elastically integrated with t, < -33. In this case, after the pinch roller 4 is pressed against the capstan 40 and is deformed to some extent, when the drive lever 33 further rotates, the spring 37 is deformed and a gap is created between the tip of the adjustment screw 39 and the crimp lever 34. The load of the spring 37 acts as a pinch pressure on the capstan 40, and by moving the adjustment screw 39 back and forth, the pinch pressure and the contact/separation timing of the pinch roller 4 with respect to the capstan 40 can be adjusted.

On the other hand, on the winding side, a pinch roller crimping drive lever 35 and a pinch roller crimping lever 36 are provided rotatably about a common fulcrum shaft 35a, and both are supported by a tension spring 37.
They are relatively rotationally biased and integrated. Also,
The drive lever 35 is always urged to rotate counterclockwise by a helical spring 62 and is supported in contact with an operating shaft provided on the pinch roller crimping link 15 . Therefore, as the pinch roller crimping link 15 rotates counterclockwise, the drive lever 35 and the crimping lever 3
6 are integrally rotated clockwise. The function of the spring 37 installed between both levers 35 and 36 is the same as that on the supply side.

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

That is, a guide plate 42 is fixed to the left side of the main chassis 8, and a fixed guide roller 43 with upper and lower flanges is erected thereon. In addition, the guide plate 42
is provided with a sensor release arm 46 that is rotatable about a fulcrum 46a and biased counterclockwise by a helical spring 47, and the pin 9C provided on the pinch shift arm 9 is biased and rotated. It serves as a stopper. Also, on the guide plate 42 is a sensor spring 4 made of a plate spring.
4 is screwed in a cantilevered manner. This sensor spring 44 is normally pressed leftward in the figure by the tip of the sensor release arm 46 and is elastically deformed. sensor spring 44
A detection piece 44a is protruded from the back surface of the free end side, and a photocoupler 45 is installed on the guide plate 42 so as to sandwich this detection piece 44a with a predetermined gap.

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

As shown in FIG. 7, a gear portion 1 is provided on the outer periphery of the rotating cam 1.
a is formed, and a sensor gear 49 is meshed and interlocked with this gear portion 1a via an intermediate two-stage gear 48. The upper surface of the sensor gear 49 is surface-treated to be black, and thin silver lines 67 for position detection are formed radially at a predetermined angular phase on this upper surface. And sensor gear 49
A photocoupler 65 is installed at a distance of about ILIII11 from the upper surface of the cam l, and the rotational position of the rotary cam l is detected by detecting the thin wire 67.

In addition, since the thin wire 67 requires particularly high precision, it must be made of a material that can plate the black part, and the thin wire 67
After the portion is made of a material that can be plated, the thin wire 67 portion is plated, thereby achieving two-color molding. With such a configuration, the label printed with a predetermined pattern with fine lines may be pasted on the gear, resulting in errors in pasting, problems such as peeling or lifting after pasting, and problems with pasting. The advantage of plating processing is that it takes less time than other methods.

Next, the operation from loading the cassette body 2 to pulling out the magnetic tape 3 and entering the recording/playback mode (play mode) will be described.

(1) First state [eject mode] (see Figure 1) In this first state, the cassette main body 2 is loaded in a predetermined position of the device, and when loading, the front lid opening/closing mechanism (not shown) is used. ), the front cover is opened and the magnetic tape 3 is in a standby state where it can be pulled out.

In this case, pinch roller 4.5, primary guide 6
．． 7. The pull-out guide rollers 20b and 21b are substantially linear and are located within the loop of the magnetic tape 3 that is not pulled out.

When the rotary cam 1 rotates clockwise from this state, the drawer cam lever 13 rotates counterclockwise, the drawer converting arm 16 rotates, and the drawer actuating lever 17 moves to the right. The drawer operating lever piece 18 also moves to the right, the drawer arm 21 rotates, and the drawer guide 21b moves to the position shown in FIG. As the rotating cam l rotates in the clockwise direction, the pull-out cam ray rotates in the counterclockwise direction of /(-13), causing the pull-out arm 20 to rotate clockwise and the pull-out guide roller 2 to rotate.
0b also moves to the position shown in FIG.

Also, a rotating cam! The clockwise rotation causes the sector 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 relay links 30, respectively, and the left and right primary guides 6.7
Then, the pinch roller 4.5 moves to the position shown in FIG.

As described above, the pinch rollers 4 and 5, the primary guide 6.7, and the pull-out guide roller 21b.

20b moves forward and outward from the cassette body 2 to pull out the magnetic tape 3. In this case, these tape locking 6
Among the points, the ones that actually pull out the magnetic tape 3 are the pull-out guide rollers 21b and 20b, and the others follow them.

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

In this state, the magnetic tape 3 pulled out of the cassette
is only in contact with the pull-out guide rollers 21b, 20b and the pair of fixed guides 43, and the magnetic tape 3
Even when running at high speed, there is no unnecessary load or friction. Note that the fixed guide 43 and the pull-out guide roller 21b
, 20b are rotating rollers, so the load is extremely small.

In addition, in this second state, the sensor release arm 46 pushes the sensor spring 44 to the left with the spring 47 and bends it, so the sensor pin 44b provided at the free end of the sensor spring 44 is separated from the magnetic tape 3. This prevents a load from being applied to the magnetic tape 3 during fast forwarding or rewinding.

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

Further, as the rotary cam 1 rotates, the take-up side pull-out arm 20 also rotates, and the pull-out guide roller 20b is moved to the third position.
Move to the position shown in the figure. Further, due to the counterclockwise rotation of the sector gear 14 accompanying the rotation of the rotary cam 1, the loading gears 28 and 29 swing forward and rotate the pinch shift arms 9 and 11, respectively, and the pinch rollers 4 and 5
and the primary guide 6.7 is moved to the position shown in FIG. At this time, the rotation of the pinch shift arms 9, 11 is regulated by stoppers 52, 53 on the chassis, and the overstroke of the loading arms 28, 29 is elastically absorbed by the relay link 30. Further, when the pinch shift arm 9 rotates counterclockwise, the pin 9c on the arm 9 presses and rotates the sensor release arm 46 clockwise, the sensor spring 44 recovers its elasticity, and the sensor pin 44b moves the magnetic tape 3 Press from the outside.

(3) Third state [Bose mode] (see Figure 3) The magnetic tape 3 further drawn out in this way is transferred to the supply reel stand 6.
3, the fixed guide 43, the sensor pin 44b, the pull-out guide roller xtb, the primary guide 6, and the guide 58. 60 , the primary guide 7 , the pull-out guide roller 20 b and the fixed guide 43 communicate with the take-up reel stand 64 . In this way, this third
In this state, since the magnetic tape 3 is separated from the capstan 40.41 and the pinch roller 4.5, it is possible to perform a search while running the magnetic tape 3 at high speed.

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

When the rotary cam 1 is further rotated clockwise from this third state, the cam follower 15 of the pinch roller crimping link 15
Only a moves from the cam center toward the outer circumference (the link 15 does not move between the first state and the third state). This counterclockwise rotation of the pinch roller crimping link I5 causes the pinch roller crimping lever 32 to move to the right, and the pinch roller crimping drive lever 33 rotates counterclockwise together with the pinch roller crimping lever 34, causing the pinch roller crimping lever 32 to move to the right. 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 crimping link 1
5 rotates counterclockwise, the pinch roller crimping drive lever 35 rotates clockwise together with the pinch roller crimping lever 36, and the pinch roller 5 is rotated via the pinch arm 12.
is pressed against the capstan 41, and the magnetic tape 3 is fed out.

(4) Fourth form of deafness [Brain motor (see Figure 4)] As described above, the magnetic tape 3 is pulled out and wrapped around all the heads, and the capstan 40.41 and the pinch roller 4.5 A state in which the vehicle can travel at a constant speed is obtained, 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 achieving this is as follows. When the back tension of the magnetic tape 3 changes, the force changes without bending the sensor spring 44 via the sensor pin 44b. The amount of deflection of the sensor spring 44 is detected by the photocoupler 45, and the back tension can be kept constant by controlling the supply resistance of the supply reel stand 63 so as to maintain the amount of deflection of the sensor spring 44 constant. can.

Although the above-mentioned embodiment describes a DAT with a fixed magnetic head, the present invention is not limited to a DAT, but can be similarly applied to other magnetic recording/reproducing devices.

<Effects of the Invention> As described in detail above, in the present invention, the magnetic tape pulled out from the cassette body is connected to the magnetic head, the pinch roller,
In other words, the second
Set the state, fast forward the magnetic tape in this second state,
Since rewinding is performed, phenomena such as wear of the magnetic head during fast forwarding and rewinding, and irregular winding due to large contact resistance can be eliminated, and as a result, the recording and reproducing function of the magnetic recording and reproducing device is maintained at a high level. Now you can.

[Brief explanation of drawings]

1 to 4 are plan views showing the main parts of the digital audio recorder according to the present invention. FIG. 1 shows the eject mode (first state), and FIG. 2 shows the stop mode (second state). , FIG. 3 shows the Bose mode (third state), and FIG. 4 shows the play mode (fourth state). FIG. 5 is a longitudinal cross-sectional view of the loading arm drive section, FIG. 6 is a view along the Vl-Vl arrow in FIG. 4, FIG. 7 is a perspective view showing the position detection section of the rotating cam, and FIG. FIG. 2 is a schematic external perspective view of the entire device. l... Pinch shift arm, 10.12... Pinch arm, 20.21... Tape pull-out arm, 40
゜41...capstan, 55-57...magnetic head.

Claims (2)

[Claims] (1) A magnetic recording and reproducing device in which a magnetic tape is pulled out from a magnetic tape cassette set at a predetermined position by a tape pull-out link mechanism and runs along a magnetic head, wherein the tape pull-out link mechanism is a tape pull-out link mechanism. and a pinch shift arm, and the pinch arm is provided with a pinch roller at a midway portion on the tip side of the pinch shift arm, and in a first state in which the magnetic tape is not pulled out from the magnetic tape cassette, The guide at the end of the tape pull-out arm and the pinch roller face inside the loop of the magnetic tape. The magnetic tape is held in a second state for high-speed running in which it does not come into contact with the capstan, and the tip guide of the pinch shift arm pulls the magnetic tape forward beyond the second state, so that the magnetic tape does not come into contact with the magnetic head. , the pinch roller and the capstan are held in a third state in which they are not in contact with each other, and as the pinch arm swings on the pinch shift arm, the pinch roller presses the magnetic tape against the capstan.
A magnetic recording/reproducing device characterized in that a magnetic tape is held in a fourth state in which it contacts a magnetic head, a pinch roller, and a capstan. (2) A sensor gear is provided that is geared to the rotary cam of the tape pull-out link mechanism, a two-color pattern is formed by plating on the side surface of the sensor gear, and this pattern is formed using a photocoupler. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus is configured to optically detect the rotational position of the rotary cam that brings about each of the first to fourth states.