JPS6117251A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To realize mode switching without passing through a mode in which pressure welding of a pinch roller is released, by controlling the position of a driving force transfer means for transferring a driving force of a motor to a mode switching rotary cam, when the pinch roller is in a state welded by pressure to a capstan. CONSTITUTION:Within a range of a rotational angle theta of cams 501, 502 between a reproducing mode (PLAY) and a reverse feed reproducing mode (REV), a pinch roller 804 is in a state welded by pressure to a capstan 805. In this state, a lever 901 is turned clockwise, and a post 307 is fitted into a groove part 2a. Accordingly, turning of a lever 305 is controlled, and even if a motor 200 is rotated in the same direction as the time of loading or the time of unloading, a gear 304 is not separated from a gear 503, and the cams 501, 508 can be rotated in reverse to the usual state. In this way, the mode can be switched to the usual reproducing mode (PLAY) from the reverse feed reproducing mode (REV) without passing through an unloading mode [UNLO ( I ), (II)] in which pressure welding of the pinch roller 804 is released, a fast forward mode (FF), etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic recording and reproducing apparatus such as a video tail recorder (hereinafter referred to as a VTR).

[Technical background of the invention]

In recent years, in VTRs, systems have been developed in which a single motor drives a tape loading mechanism and a mode switching mechanism.

Under these circumstances, the present applicant has been developing various types of the one-motor drive systems mentioned above and filing applications. As an example, the present applicant
The system shown in Figure 2 of Japanese Patent Application No. 59-1652 filed on March 9, 1982, and the system shown in Figure 2 of Japanese Patent Application No. 59-63616 filed on March 31, 1988, etc. be.

In the system shown in these figures, the driving force transmission mechanism that transmits the driving force of the motor to the tape loading mechanism and the mode switching mechanism has a function of detecting the rotational direction of the motor, and the internal mechanism is adjusted according to the detection result. It is designed so that it can be driven selectively. For such a configuration,
The direction of rotation of the motor is switched only when switching between driving the tape loading mechanism section and driving the mode switching mechanism section. Therefore, the tape loading mechanism has a switching mechanism that switches and transmits the rotational direction of the motor, thereby achieving a loading mode and an unloading mode. Furthermore, the mode switching mechanism has a rotating cam, and even though the motor rotates in one direction, multiple modes can be set by rotating the rotating cam in one direction. .

[Problems with background technology]

As described above, in the case of a configuration in which a rotating cam is provided and multiple modes are switched by rotating the rotating cam in one direction, the configuration is simple because there is no need for a switching mechanism that switches the rotational direction of the motor and transmits the information to the rotating cam. However, it has the following problems. This will be explained below.

Now, if we consider the normal playback mode and the reverse playback mode, in both of these modes, the pinch roller is crimped to the capstan, so if we consider only the crimping of the pinch roller, The rotation angle of the rotary cam for setting the two playback modes may be the same. However, the states of the tape tension lever, reel brake, etc. differ between the two playback modes. Therefore, in reality, the rotation angle of the rotary cam is different between the two playback modes. In this case, by setting the two playback modes adjacent to each other, switching between the two playback modes can be performed while maintaining the crimped state of the pinch roller, and the pinch row 2 can be driven efficiently.

However, in reality, the rotation direction of the rotary cam is limited to one direction, so the above effect is only achieved when the rotation angle of the rotary cam changes from a small mode to a large mode; In the case of switching, a mode in which the pinch roller is released from pressure, such as a fast forward mode, must be passed through. Here, when the pinch roller is released from pressure, there is a high possibility that the relative position of the magnetic tape and the capstan will shift, and the tracking position of the video head will shift from the appropriate tracking position. If this happens, when the playback mode has been switched and a new playback mode is entered, it will take some time for the video head to be able to track, and during this period the playback image will disappear9, and a noise image will be obtained. Put it away.

An operation for switching between different playback modes is continuous shooting. This continuous shooting repeats three modes: recording mode -> reverse playback mode (however, the reproduced images are met) -> normal playback mode -> recording mode... In this case, the rotation angle of the rotary cam in the recording mode and the normal playback mode is generally the same.

In such continuous shooting, if the rotation angle of the rotary cam for normal playback mode is smaller than the rotation angle of the rotary cam for reverse playback mode, when switching from reverse playback mode to normal playback mode, the above-mentioned A problem like this arises.

In the opposite case, the above problem occurs when switching from recording mode to reverse playback mode.

[Purpose of the invention]

This invention was made in order to deal with the above-mentioned circumstances, and the pinch roller crimps while taking advantage of the characteristics of this system without changing the unidirectional drive system that drives the rotating cam for mode switching in one direction. To provide a magnetic recording/reproducing device configured so as to be able to realize mode switching between two operating modes in the current state without passing through a mode in which the pinch row 2 is released from pressure.

[Summary of the invention]

This invention provides a regulating means interlocked with a pinch roller driving means for pressing the pinch roller and releasing the pressing, and when the pinch roller is in a state of pressing against the cag stan, the regulating means controls the motor. The driving force transmitting means for transmitting the driving force to the rotary cam for mode switching is configured to restrict the position.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the following explanation, this invention will be described as a cassette using a cassette having approximately the same dimensions as an audio cassette.
The case where this is applied to a VTR will be explained as a representative example.

1 to 5 are plan views showing the structure of an embodiment of the present invention. In addition, in FIGS. 1 to 5, since emphasis is placed on the two-dimensional positional relationship of each part, illustrations showing the three-dimensional positional relationship are intentionally omitted.

FIG. 1 shows the relationship between the driving force transmission mechanism, tape loading mechanism, and mode switching mechanism. This FIG. 1 is shown in the earlier patent application No.
Since this is the same as that shown in No. 63616, the explanation of the same parts will be limited to a general explanation.

In FIG. 1, 100 is a chassis.

200 is a motor, SOO is a driving force transmission mechanism, 400 is a tape loading mechanism, and 500 is a mode switching mechanism.

The driving force of the motor 200 is transmitted to the pulley 3 via a belt 301.
02, and this goo jJ 302 is rotationally driven. The rotation of this pulley 302 is transmitted to a gear 304 via a gear 303 coaxially integrated with this pulley 302.

Gear 304 is frictionally engaged with lever 305. Accordingly, the lever 305 is attached to a post 306 that forms the rotation axis of the pulley 302 or the gear 303 depending on the direction of rotation of the gear 304.
Rotate in the opposite direction using the fulcrum as a fulcrum.

For example, when the motor 200 is rotated counterclockwise, the lever 305 rotates counterclockwise due to frictional engagement with the gear 304. This causes gear 304 to be associated with tape loading mechanism 400 for loading and unloading operations. Similarly, motor 2
00 gold When rotated clockwise, ? -305 rotates clockwise. This causes the gear 304 to be associated with the mode switching mechanism section 500, and mode switching is removed.

Switching between the loading mode and the loading mode is performed using a lever 40 that rotates around the post 401.
This is accomplished by 2. That is, FIG. 1 shows the loading state, but in this case, ? -402
is rotating counterclockwise. Therefore, gear 304
is directly meshed with the gear 40B of the tape loading mechanism section 400. On the other hand, during unloading, the lever 402 rotates clockwise, and the gear 404 attached to the lever 402 is interposed between the gear 304 and the gear 403. As a result, the rotation of the gear 304 is not transmitted to the upper gear 403 via the gear 404.
is rotated in the opposite direction to that during loading.

The rotation of the lever 402 is controlled by a first rotary cam 501 for mode switching of the mode switching mechanism section 500. That is, as the cam 501 rotates, it causes the slider 601 to slide in the direction of the illustrated arrow (X14-+z, ). Due to this sliding, the tape loading mechanism section 40
The lever 405 of No. 0 is driven clockwise and counterclockwise, and the lever 402 connected to this lever 4os is driven counterclockwise and clockwise.

In addition, in the tape loading mechanism section 400, 40
Reference numeral 6 denotes a loading ring.Only one is shown in the drawing, but in reality, two are placed one on top of the other. 407～
413 transfers the driving force of the motor 200 applied to the gear 403 via the gear 304 to the two loading rings 4 mentioned above.
These are gears given to 06.

The first cam 501 for mode switching is formed on one surface of the gear 502. This gear 502 is the gear 50
The driving force of the motor 2oo is received from the gear 304 via gears 3 to 507, and is transmitted to the cam 501. A second rotary cam 50B for mode switching is formed on the other surface of the gear 502. A slider 702 is associated with this cam 508 via a pin 701. This slider 702 is slidably driven in the direction of the illustrated arrow (X3→xa) as the cam 508 rotates.

The slider 7θ2 detects the rotation angle of the cam 508, similar to how the slider 60 detects the rotation angle of the cam 501, and drives the pinch roller drive mechanism and the like. FIG. 2 shows the relationship between the slider 702 and the pinch roller drive mechanism SOO.

The illustrated pinch roller locking mechanism 800 is patented under Patent No. 11559 filed on March 31, 1980 by the applicant of this patent.
-63761. Therefore, a detailed explanation of this pinch roller lock mechanism will be omitted here, but the point is that the sliding movement of the slider 702 in the direction of the arrow (x, →xa) accompanying the rotation of the cam 50g is controlled by the lever. The information is transmitted to the pinch roller 804 through a toggle mechanism consisting of 801 to 803, etc., and the pinch roller 8
This is to release the pressure bonded to the 04ft capstan 805. In the illustrated state, the pinch roller 80
4 is crimped to the capstan 805. In this state, the slider 702 is moved in the direction shown by the arrow (X).
, ) is sliding in the direction. To release the pressure on the ginch roller 804, move the slider 702 as shown by the arrow (x4).
slide in the direction.

Note that the lever 801 connected to the slider 702 is rotatably supported by a lever 806 with a post 807 as a fulcrum, and the pressing force of the pinch roller 804 is obtained by a spring 808 connected to this lever 806. ing.

Here, the features of this invention will be explained.

In FIGS. 1 and 2, the mode switching mechanism section 5
Forms the rotation axis of gear 503 and 504 of 00? Strike 509
A lever 901 is rotatably supported on the shaft. An L-shaped groove 902 is formed at one end of this lever 901. In this groove 902, the driving force transmission mechanism section SOO
A post 307 forming a rotation axis of a gear 304 is fitted therein.

In the groove 902, a portion corresponding to one side of the L shape (
The groove portion 1a (hereinafter referred to as the groove portion 1a) extends in the direction of movement of the post 307 as the lever 305 rotates. On the other hand, a portion corresponding to the other side of the L-shape (hereinafter referred to as the groove portion 2a) is substantially orthogonal to the moving direction of the post 302.

A long hole 90B is formed at the other end of the lever 901. A bottle 703 provided on the slider 702 is fitted into the elongated hole 903 .

In such a configuration, the lever 305 rotates clockwise, ? When the stop 307 is at the boundary point between the grooves 1a and 2a, in other words, when the cams 501 and 508 are driven by the motor 200, the slider 702 moves in the direction indicated by the arrow (x3) as shown in FIG. When the pinch roller 804 is pressed against the capstan 805, the lever 90 is rotated clockwise and the post 307 is positioned in the groove 2a. This restricts the rotation of the lever 305, and even if the motor 200 is rotated in the opposite direction to the normal rotation direction (clockwise) of the motor 200 when rotating the cams 501 and 508, the gear 304 never leaves the gear 503. Therefore, when the pinch roller 804 is pressed against the capstan 805, the cam 501.
508 can be rotationally driven in both clockwise and counterclockwise directions. As a result, when the rotation angle of the rotary cam for the normal playback mode is smaller than the rotation angle of the rotary cam for the reverse playback mode, as in the previous example, switching from the reverse playback mode to the normal playback mode is possible. If done, this can be done without going through a mode in which the pinch roller 804 is released. Moreover,
Since this is achieved by reversing the motor 200, it is possible to shorten the transition time and reduce the power consumption of the motor.

Note that when the pinch roller 804 is released from pressure, the slider 702 slides in the direction of the arrow (x4) shown in the figure, and the lever 90 is in a state of being rotated counterclockwise. Therefore, in this state, the post 307
is located at the boundary point between groove 1a and groove 2a. This releases the restriction on the rotation of the lever 305, and by rotating the motor 200 counterclockwise, the lever 305 rotates counterclockwise. Can be set.

Now, with reference to FIGS. 3 to 7, the characteristic operation of the present invention will be explained in the overall flow of the mode switching operation. Figures 3 to 5 show the driving force transmission mechanism 3.
00 is a plan view showing a portion of a mode switching mechanism section 500 and a tape loading mechanism section 400. FIG. 6 is a state transition diagram showing the relationship between the rotation angle θ of the cam 501, the stroke amount S1 of the slider 60'1, and the mode. Figure 7 shows the rotation angle θ of the cam 5080 and the slider 70.
2 is a state transition diagram showing the relationship between the stroke amount S2 and the mode of No. 2. FIG.

- Before loading the cassette (not shown) into the VTR, each mechanism is in the same state as when unloading, as shown in FIG. Below, this state will be changed to stop mode (5T
OP).

(2) When the cassette is attached to the VTR and the playback operation key is operated, the motor 200 rotates clockwise and the gear 304 meshes with the gear 503. Come on, cam 6
01.508 is rotationally driven, and the slider 601 is the sixth
As shown in the figure, it slides in the direction of the arrow (xl) shown in the figure from the intermediate position Sl&. As a result, lever 402 rotates counterclockwise, and gear 404 separates from gear 40B as shown in FIG.

(2) When the stroke is1 of the slider 601 reaches 31b, the motor 2θ0 rotates counterclockwise. As a result, gear 304 meshes with gear 403, as shown in FIG. As a result, the loading ring 406 rotates, and the magnetic tee 7'' (not shown) is wound around the sill ring (not shown) provided inside the ring 406, and loading is completed. -■ When loading is completed , the motor 200 rotates clockwise again, resulting in the state shown in FIG.

As a result, the cams 501 and 508 are rotationally driven, and the sixth
As shown in the figure, slider 601 is now moved to arrow C
x*) direction. Further, the slider 702 slides in the direction of the arrow (X,) shown in the figure from the base point sea.

(2) As the slider 601 slides in the direction of the arrow (X,) shown in the figure, the lever 402 rotates clockwise. As a result, the gear 404 meshes with the gear 403 as shown in FIG. 5, and the unloading standby state is established.

When the slider 702 reaches Szb by sliding in the direction of the arrow (X,) shown in the figure, the pinch roller 804 is pressed against the capstan 805 as shown in FIG. 2, and the playback mode is set. Note that the playback mode in this case is normal playback mode (PLAY) and fast forward playback mode (CU
E). Further, recording mode (RFC) is also performed in this state.

It should be noted that the gear 404 meshes with the gear 403 due to the sliding of the slider 601 only when the stroke amount S□ of the slider 601 is 5IIL.
), the slider 601 further slides and reaches StC. This is because the slider 601 is involved not only in driving the tape loading mechanism section 400 but also in driving other mechanisms (not shown).

■ In addition to this playback mode (PLAY), the cam 50
1. Rotate 508 to enter reverse playback mode (REV
). At this time, the slider 601 returns to the 5IIL position, but the slider 702 does not move at all. Therefore, the pressed state of the pinch roller 804 is maintained.

■ In addition to this reverse playback mode (Rα), the cam 50
When 1.50g is rotated, the position of the slider 600 does not change, but the slider 702 (d) is moved to the arrow (x4) shown in the figure, and the pinch roller 804 is separated from the capstan 805. This causes the first unloading mode (UN
LO(1) ) is set.

■ After this, by further rotating the cam 501, 5#8, you can enter the fast forward mode (Fr) and rewind mode (RE).
V), the second unloading monid (UNLO(
H)) are set sequentially, and the cams 501 and 508 rotate once and return to the stop mode (5TOP).

There are two unloading modes, 1st and 2nd (U
NLO(1), (If)) is 8 simple VT
This is because the R cassette does not have a tape guide post. That is, in an 8 m VTR, since the cassette does not have a tape guide post, fast forwarding and rewinding are performed in a so-called half-loading state in which the magnetic tape is removed from the cylinder but not completely stored in the cassette.

Therefore, when you operate the eject key to eject the cassette after fast forwarding or rewinding, the cam 50 is pressed until the first unloading mode (UNI, 0 (1))
A configuration in which unloading cannot be performed unless the 1° 502 is rotated takes time. Therefore, rewind mode (REV)
) immediately after the second unloading mode (UNL
This means that Oω)) is set.

By the way, as is clear from FIG. 7, in the range of the rotation angle θ of the cams 501 and 502 between the normal playback mode (PLAY) and the reverse playback mode (REV), the pinch roller 804 is in contact with the capstan 805. It is in a crimped state. In this state, the lever 90 rotates clockwise as shown in FIG. 2, and the post 307 is fitted into the groove 2a. Therefore, the rotation of the lever 3050 is restricted, and even if the motor 200 is rotated in the same direction as when loading or unloading, the gear 304 is
cams 501, 508 can be rotated in the opposite direction. This allows the unloading mode (UNLO(I), ω) in which the pressure of the pinch roller 804 is released and the fast forwarding mode (FF
) etc., the reverse playback mode (REV
) to the normal playback mode (PLAY).

When moving from the reverse reproduction mode (REV) to, for example, the fast forward mode (FF), the pressure of the pinch roller 804 is released, and the lever 901 is rotated counterclockwise as shown in FIG. Therefore, since the post 307 comes off from the groove 2a, an unloading operation can be performed.

As detailed above, according to this embodiment, the lever 901
With a simple configuration that only requires the provision of a reproducing mode, mode switching between different playback modes can be performed without releasing the pinch roller 804.

Since the configuration forcibly restricts the rotation of the lever 305, there is no need to change the characteristic of the unidirectional drive method, which does not require a complicated switching mechanism to switch the rotation of the gear 304 and transmit it to the gear 503. do not have.

From the above, it can be said that according to this embodiment, the mode switching efficiency of the unidirectional drive system is improved to the extent that the mode switching efficiency between different playback modes is improved.

〔Effect of the invention〕

As described above, according to the present invention, the two operations in which the pinch roller is in the crimping state can be performed without changing the unidirectional drive method that drives the rotary cam for mode switching in one direction, while taking advantage of the features of this method. It is possible to provide a magnetic recording/reproducing device configured so that mode switching between modes can be realized without passing through a mode in which the pressure of the pinch roller is released.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a part of the configuration of an embodiment of the present invention, FIG. 2 is a plan view showing other parts, and FIGS. 3 to 5 are shown in FIGS. 1 and 2. A partially extracted plan view of the device, and FIGS. 6 and 7 are state transition diagrams showing the relationship between the stroke amounts of the rotary cam and slider for mode switching, and various operation modes. 2 o o 8. , motor, 300... driving force transmission mechanism section, 400... tape loading mechanism section, 500
...Mode switching mechanism section, 800...Pinch roller drive mechanism, 501.508...Rotating cam, 702...
・S5Il'-%, 901... Renogu-. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 5

Claims (1)

[Claims] A rotating cam for switching between a plurality of operation modes; and a pinch roller drive that is linked to the rotating cam and presses the pinch roller against the capstan when the rotation angle of the rotating cam is within a predetermined range. and a driving force transmitting means that can move in first and second directions opposite to each other depending on the rotational direction of the motor, and can transmit the driving force of the motor to the rotating cam while moving in the first direction. and a regulating means that is interlocked with the pinch roller driving means and regulates movement of the driving force transmitting means in the second direction when the pinch roller is in a state of being pressed against the capstan, A magnetic recording/reproducing device characterized in that, when the pinch roller is pressed against the capstan, the rotary cam can be driven to rotate in both forward and reverse directions by the motor.