JPH087905B2 - Magnetic tape recording / playback device - Google Patents

Description

The present invention relates to a magnetic tape recording / reproducing apparatus such as a video tape recorder (VTR).

(Prior Art) A VTR changes a running path (tape path) of a magnetic tape loaded between reels according to a mode by various tape running control mechanisms. For example, in a reproducing or recording mode, a VTR between reels is changed. The magnetic tape is pulled out by a loading pole and wound around a drum having a rotating magnetic head over a predetermined angle range, and the tension pole provided on the tension arm is brought into contact with this magnetic tape to adjust the tape tension and the like by various tape running control mechanisms. To do. Therefore, in such a VTR, each tape running control mechanism and the loading pole are driven in synchronization with each other to obtain a tape path according to the mode.

Conventionally, a VTR as described above is connected to a loading pole and each tape running control mechanism by driving a mode control gear driven by a mode control motor according to the mode, and is driven via the mode control gear.
It is known that a tension arm is swingably supported on a main chassis in the vicinity of a movement locus of a loading pole and the tension pole is brought into contact with a magnetic tape by movement of a reel stand chassis.

The above-mentioned VTR is proposed in JP-A-63-225949.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional VTR, the tension arm is swingably supported by the main chassis and the swing fulcrum is fixed to the chassis. In consideration of the change in the load and the movement of the loading pole, the tension arm must be placed at a position that is separated from the change area of the tape path and the movement path of the loading pole by a considerable distance, and the degree of freedom in determining the position of the tension arm is limited. There is a problem that it is small and large.

Further, in the above-mentioned VTR, since the mode control gear is connected not only to the loading pole but also to each tape running control mechanism, the arrangement position of the mode control gear is largely restricted and the arrangement position is limited. There is a problem in that the connecting element for connecting each tape running control mechanism becomes large and complicated on the chassis, which makes the mechanism complicated.

The present invention has been made in view of the above problems, and provides a magnetic tape recording / reproducing apparatus which has a large degree of freedom in determining the arrangement position of a mechanical element without increasing the size and simplifies the mechanism. The purpose is to do.

(Means for Solving the Problem) According to the present invention, the travel route varying mechanism operates according to the mode to change the travel route of the magnetic tape loaded between the reels according to the mode. In a magnetic tape recording / reproducing apparatus which adjusts the tape tension by contacting a tension pole provided with a tension arm with a magnetic tape, the magnetic tape is movable relative to the mounted tape cassette and at the time of tape loading. Moves linearly in the direction of the drum around which the magnetic tape is wound,
Also, the tension arm is swingably supported, and the tension pole moves in accordance with a mode on a trajectory including a tension adjustment position where the tension of the magnetic tape can be adjusted and an unadjustable position where the tension of the magnetic tape cannot be adjusted. It is a gist to provide a supporting member to be operated, and mechanically connect the traveling path varying mechanism to the supporting member to operate according to the position of the supporting member.

More specifically, the impedance roller is movably supported by the avoidance mechanism and the avoidance mechanism is coupled so as to respond to the position of the support member, and the lock mechanism of the cassette housing responds to the position of the support member. And the brake mechanism of the reel drive member is connected so as to respond to the position of the support member.

(Operation) In the magnetic tape recording / reproducing apparatus of the present invention, the tension arm is supported by the supporting member that moves according to the mode, so that the tension arm can be operated to avoid a change in the tape path, and the size thereof can be reduced. Can be achieved. Further, since the tape running control mechanism is connected to the support member whose position changes according to the mode, the tape running control mechanism can be operated according to the mode, and the support member and the tape running control mechanism can be simplified. Can be connected in various configurations.

In the magnetic tape recording / reproducing apparatus in which the avoidance mechanism is movably supported by the avoidance mechanism and the avoidance mechanism is connected to the support member, the support roller retracts the impedance roller from the locus of the loading pole when the loading pole moves. Further, in the magnetic tape recording / reproducing apparatus in which the lock mechanism of the cassette housing is connected to the support member, the lock mechanism can be released by the loading actuator, so that the number of parts can be reduced. Even in the magnetic tape recording / reproducing apparatus in which the brake mechanism of the reel driving member is connected to the supporting member, the brake mechanism can be controlled by the loading actuator, and the number of parts can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 16 show a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention. FIG. 1 is a plan view of a main mechanical system, FIG. 2 is a side view, FIG. 3, FIG. FIGS. 5, 6, and 7 are plan views showing one main part in a different state, and FIGS. 8, 9, and 10 are plan views showing another main part in a different state, FIGS. 11 and 12 are side views showing another main part in a different state, FIG. 13 is a perspective view of one main part, FIG. 14 is a plan view of one component, and FIG. FIG. 16 is a plan view of another component, and FIG. 16 is a schematic plan view showing a tape running system.

In FIG. 16, reference numeral 11 denotes a main chassis, and the chassis 11 has a supply reel base (reel driving member) on the lower side in the drawing.
12 and a take-up reel drive gear (reel drive member) 13a are rotatably juxtaposed with each other, a cassette housing (not shown) is movably supported above the lower part of the take-up reel drive gear 13a. The transmission gear 13b meshes, and this transmission gear 13b
A brake mechanism 71 is provided near b as shown in FIG. The supply reel base 12 and the transmission gear 13b are connected to a capstan motor (not shown) and driven integrally with a capstan described later. As is well known, the tape cassette contains a magnetic tape 16 wound between a supply reel 14 and a take-up reel 15 in a case (not shown). Reference numeral 17 is a guide pole provided on the case of the cassette.

The brake mechanism 71 includes the brake mechanism shown in FIG. 1, FIG. 8, FIG.
As shown in FIG. 10, a substantially fan-shaped brake lever 72, one end of which is swingably supported, is provided near the transmission gear 13b. The brake lever 72 has a frictional contact portion 72a and an engagement portion 72b formed on the other end thereof so as to be separated from each other in the swinging direction, and is urged clockwise by a torsion spring (not shown) in the figure. The engaging portion 72b engages with the brake plate 73 and engages with a slide plate to be described later via the brake plate 73, and the friction contact portion 72a frictionally contacts the transmission gear 13b by the clockwise rotation of the brake lever 72 in the figure. Contact is made to brake the rotation of the transmission gear 13b. The brake plate 73 extends to the left and right in the figure at the lower position of the reel base 12 and the transmission gear 13b in the figure, and has elongated holes 7 at both ends.
3a and 73b are formed, and pins 74a and 74b fixed to the chassis 11 are loosely inserted in the elongated holes 73a and 73b and supported by the chassis 11 slidably in the left and right directions in the figure, and by a spring (not shown) in the figure. It is biased to the left. This brake plate
73 has an engaging portion 72b of the brake lever 72 at the right end in the drawing and a pin 75 at the left end in the drawing so that the pin 75 engages with a slide plate described later. This brake plate 73
Driven by the slide plate, it moves left and right in the figure,
The right movement in the figure pushes the engaging portion 72b to separate the frictional contact portion 72a from the transmission gear 13b. Although not shown in the figure,
The brake lever 72 is also connected to another actuator and driven by this actuator.

The cassette housing has a holder into which a tape cassette can be inserted, and is movably supported by the chassis 11 via a pantograph type lifting mechanism. A lock mechanism (tape running control mechanism) 76 is provided between the cassette housing and the chassis 11, and the cassette housing is fixed to the chassis 11 at the lowered position. The lock mechanism 76 includes a lock plate 77 and a cancel plate (not shown). As shown in FIGS. 1, 11, and 12, the lock plate 77 slides on the back surface of the chassis 11 in the vertical direction in FIG. It is arranged freely. The lock plate 77 has a hook 77a standing upright at one end (right side in FIGS. 11 and 12) so as to be able to engage with the lock pin 78 of the cassette housing, and a locking piece 77b at the center portion to serve as a slide plate described later. It is erected so that it can be engaged. The lock plate 77 is biased to the left in FIGS. 11 and 12 by a spring (not shown), and the locking plate 77b is pressed by the slide plate to move to the right in the drawings. The lock mechanism 76 locks the lock pin 78 to the lock plate 77 at the lowered position of the cassette housing.
The hook 77a is locked and held in the lowered position, and the lock plate 77 is moved by the movement of the slide plate to unlock the lock pin 78 and the hook 77a.

Further, as shown in FIG. 6, the chassis 11 supports a drum 18 on an upper portion in the drawing, and a loading guide pole 19, a loading inclined pole 20, an impedance roller 21, an inclined pole 22 and a later-described portion on the left side of the drum 18 in the drawing. The tension pole 23, which is located on the right side of the drum 18 in the figure, is a loading guide pole 24, a loading tilt pole 25, a tilt pole 26, a middle pole 27, an A / C head 28, and a guide roller 2.
9, a pinch roller 30 and a capstan 31 are arranged. Of the above-mentioned members, the tension pole 23 and the loading inclined pole 2 provided corresponding to the supply reel 14 side
0, the loading guide pole 19, and the loading guide pole 24, the loading tilt pole 25, and the middle pole 27, which are provided corresponding to the take-up reel 15 side, are the tape cassettes not shown in the initial state before the tape loading is started. Waiting in the notch on the bottom of the front of the. Also, the drum 18
Is composed of a lower drum fixed to the chassis 11 and an upper drum provided with a magnetic head, and the upper drum is driven by a drum motor to rotate. The loading guide pole 19 and the loading tilt pole 20 are supported by a pole base 79 (see FIGS. 3 to 7), and similarly,
The loading guide pole 24 and the loading slanting pole 25 are also not shown in the pole base (hereinafter referred to as the number
79), and these pole bases 79 are movably supported on a predetermined locus and driven by a mode control motor (not shown). These loading poles 19, 20, 24, 25 (hereinafter collectively referred to as LP) move upward in the drawing at the time of loading, pull out the magnetic tape 16 from the cassette and wind it around the drum 18 over a predetermined angle range. At the time of unloading, the magnetic tape 16 is stored in the cassette by moving in the direction opposite to that at the time of loading.

Drum 18, inclined poles 22 and 26, middle pole 2
7, the description of the A / C head 28, the guide roller 29, the pinch roller 30, and the capstan 31 is omitted.

As clearly shown in FIGS. 1 and 2, the impedance roller 21 is rotatably provided at the lower end of the roller arm 80 extending substantially vertically in the drawings. The roller arm 80 is swingably supported by a base member 81 whose upper end is fixed to the upper surface of the chassis 11 in the figure, and is formed by a torsion spring (not shown) interposed between the roller arm 80 and the base member 81.
It is biased counterclockwise in the figure. A pin 80a is vertically provided on the lower surface of the intermediate portion of the roller arm 80, and the pin 80a is in contact with the cancel lever 82 by the elastic force of the torsion spring. The cancel lever 82 is vertically extended below the limit plate, which will be described later,
The lower end in the figure is swingably supported by a pin 83 planted in the chassis 11, and the upper end in the figure engages with the pin 80a.
This cancel lever 82 has a concave cam surface on the right side edge in the figure.
82a is formed, and a cam pin 84 fixed to the limit plate is slidably contacted with the right side edge. The cancel lever 82 rotates clockwise in the figure by the elastic force of the torsion spring when the limit plate moves upward, and the roller arm 80 moves.
Is rotated counterclockwise by the rotation of the cancel lever 82, and the impedance roller 21 moves right in the figure. The roller arm 80, the cancel lever 82, and the limit plate described above constitute an avoidance mechanism (tape traveling control mechanism) 85.

As shown in FIGS. 1 to 10, the slide plate 33 is provided so as to be movable relative to the mounted tape cassette, and the slide plate 33 is mounted on the chassis 11 (see FIG. 16) during tape loading. ) It is designed to move on the drum in a substantially straight line. On the slide plate 33, a tension arm 32 having a tension pole 23 provided upright at the tip is swingably supported. At this time, on the slide plate 33, in the vicinity of the left side of the supply reel base 12, a support pin 35 serving as a swing fulcrum of the tension arm 32 is provided. Therefore, the tension pole 23
Is swingable about the support pin 35 via the tension arm 32, and can move substantially linearly as the slide plate 33 moves in the drum direction. In other words, the movement path of the tension pole. Is formed by combining two operations of linear movement and swing. Further, as shown in FIG. 13, a limit plate 34 is slidably provided on the slide plate 33. This limit plate 34 also corresponds to a support member. As shown in detail in FIG. 15, the slide plate 33 has elongated holes 33a, 33b for guiding vertically extending in the lower part and the central part in the drawing, respectively. Locking hole near 33b
33c has an elongated hole 33d extending vertically in the upper part of the figure, a spring locking part 33e, a concave cam surface 33f and a stepped engaging part 33g in the lower part of the figure, and an elongated hole 33a. A support pin 35 is erected near the upper edge of the tension arm 32, and the tension arm 32 is supported by the pin 35. Slide plate 33 has a long hole
Guide pins 36a, 3 that are erected on the upper surface of the chassis 11 on 33a, 33b
6b is slidably inserted, a drive pin 37a provided on a drive lever 37 described later is loosely inserted in the locking hole 33c, and the lower end in the figure is locked in the slot 33d at the lower edge of the slot 33d in the figure. Spring 3
8 are arranged. Then, the above-mentioned pin 75 of the brake plate 73 slidably abuts on the cam surface 33f, and the engaging portion
33g engages with the locking piece 77b of the lock plate 77 described above. The slide plate 33 is driven by the swing of the drive lever 37, and the guide pins 36a and 36b are guided in the long holes 33a and 33b.
Slides and moves vertically in the figure.

As shown in FIG. 14, the limit plate 34 has a long hole 34a for spring placement and a long hole 34b for guide in the upper part of the figure, and a long hole 34c for guide in the lower part of the figure. Locking holes 34d that extend to the left and right in the drawing in the vicinity of the upper edge, elongated guide holes 34f that extend vertically in the drawing are formed on the left side of the drawing, and there are also elongated holes 34f and 34a. The cam pin 84 described above is vertically provided on the back surface between them, and the cam portion 34e capable of contacting with a guide pin of the tension arm 32, which will be described later, is provided at the lower right portion of the drawing.
Have. In the limit plate 34, the spring 38 described above is arranged in the long hole 34a, the guide pins 39a, 39b planted in the slide plate 33 are slidably inserted into the long holes 34b, 34c, respectively, and the locking hole 34d is formed. The drive pin 37a of the drive lever 37 is slidably inserted through the locking hole 33c of the slide plate 33, and the pin 83 described above is slidably inserted in the long hole 34f. The spring 38 has one end locked to the lower edge of the elongated hole 33d of the slide plate 33 in the figure and the other end to the upper edge of the elongated hole 34a of the limit plate 34 in the figure to guide the slide plate 33 and the limit plate 34. The pins 39a, 39b are urged in the direction of coming into contact with the upper edges of the elongated holes 34b, 34c. The cam portion 34e has a parallel cam surface 99a parallel to the relative displacement direction of the limit plate 34 and the slide plate 33 and an inclined cam surface 99b inclined by a predetermined angle. As will be described later, in the cam member 34e, the guide pin contacts the parallel cam surface 99a in the PAUSE mode, and the guide pin slides in contact with the inclined cam surface 99b during the transition from the PLAY mode to the PAUSE mode. This limit plate 34 includes a slide plate 33 and an elongated hole 34b,
It is coupled by a spring 38 to enable relative displacement corresponding to the length of 34c, and is driven by a drive pin 37a of a drive lever 37 by sliding pins 39a, 39b, 83 in the elongated holes 34b, 34c, 34f.

The tension arm 32 is formed by coupling a base portion 32a and an arm portion 32b integrally extending from the base portion 32a so that the relative position in the rotational direction can be adjusted, and the base portion 32a is supported by a support pin 35 so as to be rotatable relative to each other. Tension pole 2 at the tip of arm 32b
Supports three. The base portion 32a is vertically separated from each other on the left side of the drawing, and both ends of a brake band (not shown) are fixed to the base portion 32a, and a locking portion 40c is formed on the left side of the drawing to engage the end portion of the tension spring 42. It has stopped. The brake band is wound around the supply reel base 12, and the tension arm 32 rotates counterclockwise in the figure to fasten the supply reel base 12 to brake the rotation of the supply reel base 12. Spring 42 is the base
The tension arm 32 is stretched between the locking portion 40c of the 32a and the locking portion 33e of the slide plate 33 to urge the tension arm 32 counterclockwise in the drawing. The above-mentioned tension pole 23 is provided upright at the tip of the arm portion 32b, and a guide pin 43 is vertically provided in the middle. The guide pin 43 is slidably inserted in a guide groove 11b formed in the chassis 11. The guide groove 11b is formed by smoothly connecting a portion 49a extending substantially vertically in the drawing and a portion 49b extending substantially leftward in the drawing, and this portion 49b is further connected to a guide groove 11a described later. .
The guide groove 11b is a portion where the portion 49a prevents the tension arm 32 from swinging when the slide plate 33 to be described later is moved to maintain a predetermined posture, and the portion 49b allows the swinging of the tension arm 32. Stipulated.

The drive lever 37 is provided on the back surface of the chassis 11,
The middle portion is rotatably supported by the chassis 11. In the drive lever 37, the drive pin 37a provided at one end penetrates the guide groove 11a of the chassis 11 and is inserted into the locking hole 33c of the slide plate 33 and the locking hole 34d of the limit plate 34 as described above. Further, a pin 37b is planted at the other end, and the pin 37b is inserted into the spiral cam hole 44a of the cam gear 44. The cam gear 44 has a disc shape and is rotatably supported by the chassis 11, and a gear 44b is formed on the outer periphery of the spiral cam hole 44a. The cam gear 44 is connected to a mode control motor via a gear train that meshes with the gear 44b, and is driven by the mode control motor in conjunction with the pole base described above.

Although not shown in the figure, the mode control motor is connected to a pole base that supports the loading pole LP through various mechanisms.

In the magnetic tape recording / reproducing apparatus of this embodiment, a slide plate 33 driven by a mode control motor oscillatably supports a tension arm 32 having a tension pole 23 at its tip, and a tape cassette is ejected (EJEC
T), fast forward or rewind of tape 16 (FF / REW), temporary stop (RECLOCK), play (PLAY) and stop (STOP). The slide plate 33 is moved together with the tension arm 32 to a position according to the mode in synchronization with the driving. Therefore, even if the tape path changes depending on the mode as described later, the tension arm 32
Can be easily prevented from interfering with the loading pole LP or the tape 16, etc., which gives a great degree of freedom in deciding the placement positions of various poles and other component parts, and the component parts can be centrally arranged near the tape path. Can be miniaturized.

 Each mode will be described below.

For example, when installing the cassette, the cam gear 44
Is in the FF / REW mode position shown in FIG. 3, the pin 37b of the drive lever 37 is located slightly inward from the other end of the cam hole 44a, and the slide plate 33 is also located near the lower part in the figure, and the tension arm 32 The fulcrum, that is, the support pin 35 is also located near the lower side in the figure. The tension arm 32 has the guide pin 43 positioned below the portion 49a of the guide groove 11b so that the left and right movements of the tension arm 32 are restricted, and thus the movement of the tension pole 23 is also restricted. At this time, although not shown, the tension pole 23 is in a position corresponding to the notch in the bottom of the front surface of the cassette, and each loading pole LP is also in a position corresponding to the notch in the cassette. And the 12th
As shown in the figure, the lock plate 77 is at the left position in the figure where the hook 77a can be locked with the lock pin 78, and when the cassette housing descends as the cassette is loaded, the pole plate
23 and LP are loosely inserted in the notches at the bottom of the cassette, and the lock pin 78 is locked to the hook 77a, so that the cassette housing is held in the lowered position.

In this FF / REW mode, as shown in FIG.
The brake plate 73 holds the brake arm 72 in the position rotated counterclockwise in the figure with the pin 75 riding on the cam surface 33f of the slide plate 33, so that the friction contact portion 72a transmits the brake arm 72. The braking of the transmission gear 13b is released by separating from the gear 13b.

Here, when the cassette is installed, the REC LOCK shown in FIG.
As shown in the mode, the pole base 79 is moved by being driven by the mode control motor, and the loading pole LP winds the tape 16 around the drum 18.
In synchronism with the movement of 79, the cam gear 44 is also driven by a mode control motor (not shown) to rotate counterclockwise by a predetermined angle from the state of FIG. 3, and the slide plate 33 moves upward by a predetermined distance in the figure. Therefore, the support pin 35 also moves upward in the figure, and the tension arm 32 also slides in the guide pin 43 of the guide pin 43 in the portion 49a of the guide groove 11b.
To move to the whole. At this time, the restraint portion 34e of the limit plate 34 is engaged with the guide groove 11b.
It is located at the connection part with 11a, and guide pin is attached to this restraint part 34e.
The guide pin 43 is biased by the spring 42 to come into contact with the guide pin 43, so that the guide pin 43 is prevented from moving toward the left side in the drawing and the movement of the tension arm 32 is restricted. Then, the tension servo mechanism is held in an inoperative state. In addition, tension pole
The numeral 32 is located at an inner side position where the tape tension is weakened, and the tension of the tape 16 which has been tape-passed and stopped running is slackened so that the tape is not damaged.

Further, at the time of shifting to the REC LOCK mode, the cam pin 84 of the limit plate 34 slides on the side edge of the cancel lever 82 until the pole base 79 passes the side of the impedance roller 21, so that the impedance roller 21 is held. When the pole base 79 is positioned outside the locus of the pole base 79 (see FIGS. 4 and 5), and then the pole base 79 passes the side of the impedance roller 21, the cam pin 84 sinks into the cam surface 83a of the cancel lever 82, The elastic force of the torsion spring causes the cancel lever 82 to rotate and the cancel lever to rotate.
The roller arm 80 rotates by the rotation of 82, and the impedance roller 21 moves toward the tape 16 and contacts the tape 16. Therefore, it is possible to prevent the loading pole LP from interfering with the impedance roller 21 when the loading pole LP moves. Since the limit plate 34 drives the roller arm 80 via the cancel lever 82, the loading pole LP is driven when the roller arm 80 is driven.
There is no force acting on the
It is possible to separate the impedance roller 21 from the locus of the pole base 79, and it is also possible to prevent dust generated as the impedance roller 21 rotates from adhering to the tape 16.

In this REC LOCK mode, since the engaging portion 33g of the slight plate 33 is separated from the locking piece 77b of the lock plate 77, the locking state of the hook 77a of the lock plate 77 and the lock pin 78 is maintained. (See FIG. 12) In addition, although the roller 75 is not located on the cam surface 33f of the slide plate 33 in the brake plate 73, the brake lever 72 is rotated in the counterclockwise direction in the figure by another actuator, so that the friction slide is performed. The contact portion 72a does not contact the take-up reel base 13 (see FIG. 9).

Next, when the PLAY or REC operation button is operated (PLAY or REC mode), the cam gear 44 further rotates counterclockwise in the figure by a predetermined angle as shown in FIG.
Then, only the limit plate 34 moves upward in the figure, and the restraint portion 34e of the limit plate 34 releases the guide groove 11b, so that the tension arm 32 also has the guide pin 43 in the free state and is counterclockwise by the urging force of the spring 42. Direction, the tension pole 23 moves to the left in the figure and the tape
The tension servo mechanism that gives tension to 16 operates.
That is, the tension arm 32 is rotated counterclockwise in the figure by the elastic force of the spring 42 when the tape 16 has a small tension and is relaxed, and the band brake 41 causes the supply reel base to rotate.
When the tape 16 has a large tension, the tape 16 is rotated clockwise to loosen the brake band 41 to weaken the braking force to the supply reel base 12 to reduce the braking force to the tape 16. Swing according to the tension of the supply reel stand 12
The braking force is controlled so that the tension of the running tape 16 is adjusted to be constant. In the PLAY or REC mode, the limit plate 34 extends the spring 38 and uses the upward urging force of the slide plate 33 in the drawing as a crimping force for positioning.

In addition, from the REC LOCK mode above, this PLAY or RE
At the time of shifting to the C mode, since only the limit plate 34 moves, the moving distance of the limit plate 34 is small and the roller arm 80 does not swing, the impedance roller 21 maintains the substantially same position as in the PLAY mode. Moreover, since the slide plate 33 does not move, the brake lever 72 and the lock plate 77 also do not move.

Here, if the PAUSE operation button is operated, the REC LOCK mode shown in FIG.
When 44 rotates clockwise by a predetermined angle, only the limit plate 34 moves downward again, and the restraint portion of the limit plate 34 pushes the guide pin 43 rightward in the drawing to tension the tension arm 32. Paul 23 is a tape
The tension of 16 is maintained in the state of moving in the loosening direction (inward direction), and is similar to the above. Even when shifting to the REC LOCK mode, the slide plate 33 does not move, and the brake lever 72, the lock plate 77 and the impedance roller 21 maintain the same state as in the PLAY mode.

When the FF / REW operation button is operated, the state shown in FIG. 3 described above is reached, the cam gear 44 operates in the opposite manner, and the tension pole 23 is again in the notch in the front bottom of the cassette. Then, the tape 16 is fast forwarded or rewound in this state. At this time, the tension pole 23 does not come into contact with the tape 16 running at high speed.

When the STOP operation button is operated in place of the FF / REW operation button, the state shown in FIG. 3 described above is obtained as in the FF / REW mode, and the tape 16 also stops running in this state. There is.

Then, when the operation button of EJECT is operated, as shown in FIG. 1, the cam gear 44 rotates counterclockwise from the state shown in FIG.
The pin 37b of 37 is located at the end of the cam hole 44a, the slide plate 33 also moves further downward in the figure, the engagement between the hook 77a and the lock pin 78 is released, and the cassette housing (not shown) is raised. The cassette is ejected.

In the embodiment described above, the tension arm 32 is controlled by moving the slide plate 33. However, for example, the tension servo mechanism can be operated from the unloading position in the notch of the cassette of the tension pole 23. Only the movement to the operating loading position may be performed by moving the fulcrum of the tension arm 32 by the support member such as the slide plate or the link member described above, and other operations may be controlled by another mechanism.

Further, although the VTR is exemplified in the above-mentioned embodiment, it goes without saying that the present invention can be applied to a digital audio tape recorder (R-DAT).

(Effects of the Invention) As described above, according to the magnetic tape recording / reproducing apparatus of the present invention, the support member, the position of which changes according to the mode, is provided, and the tension arm is supported by the support member, and the support member The drive path changing mechanism is connected to the drive path changing mechanism to respond to the position of the support member, so that the components can be centrally arranged without considering interference with the tension arm, and the tape path according to the mode can be set. Can be achieved with a simple mechanical system, and the size can be reduced.

In addition, in the above-described embodiment, the roller arm that supports the impedance roller is driven by the support member to move out of the locus of the loading pole when the loading pole moves, so a force that causes tilting is applied to the loading pole. Without moving the impedance roller.

Further, in the above-described embodiment, since the lock plate is driven by the support member to release the lock mechanism of the cassette housing at the time of eject, the lock mechanism can be released without providing another actuator, and the number of parts can be reduced. .

Furthermore, in the above-described embodiment, since the support member is mechanically connected to the brake mechanism of the driving force transmission gear for winding and the brake mechanism of the transmission gear is operated according to the position of the support member, The operation can be reliably associated with the mode, and high reliability is obtained.

[Brief description of drawings]

1 to 16 show a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention. FIG. 1 is a plan view of a main mechanical system, FIG. 2 is a side view, FIG. 3, FIG. FIGS. 5, 6, and 7 are plan views showing one main part in a different state, and FIGS. 8, 9, and 10 are plan views showing another main part in a different state, FIGS. 11 and 12 are side views showing another main part in a different state, FIG. 13 is a perspective view of one main part, FIG. 14 is a plan view of one component, and FIG. FIG. 16 is a plan view of another component, and FIG. 16 is a schematic plan view showing a tape running system. 11 ... Main chassis, 12 ... Supply reel stand (reel drive member), 13b ... Transmission gear (reel drive member), 14 ...
… Supply reel, 15 …… Take-up reel, 16 …… Magnetic tape,
18 …… Drum, 19,20,24,25, LP …… Loading pole, 21 …… Impedance roller, 23 …… Tension pole, 32 …… Tension arm, 33 …… Slide plate (supporting member), 34 …… Limit plate (support member), 71 ... Brake mechanism (tape running control mechanism), 76
...... Lock mechanism (tape running control mechanism), 79 …… Pole base, 85 …… Avoiding mechanism (tape running control mechanism).

Claims (4)

[Claims] 1. A traveling path varying mechanism operates according to a mode to change a traveling path of a magnetic tape loaded between reels in a tape cassette according to the mode, and a tension arm is attached to the magnetic tape in at least one mode. In a magnetic tape recording / reproducing apparatus that adjusts the tape tension by contacting a tension pole provided on the magnetic tape, the magnetic tape is movable relative to the mounted tape cassette, and the magnetic tape is wound during tape loading. A tension adjustment position that linearly moves in the direction of the rotating drum, supports the tension arm swingably, and adjusts the tension of the magnetic tape by the tension pole and the adjustment that cannot adjust the tension of the magnetic tape. A support member that moves according to the mode is provided on a trajectory including an impossible position, and the travel route variable machine is provided on the support member. A magnetic tape recording / reproducing apparatus, characterized in that the components are mechanically connected to operate in accordance with the movement position of the supporting member. 2. A magnetic tape loaded between reels in a tape cassette is pulled out by a loading pole in at least one mode and wound around a drum having a rotary magnetic head, and the magnetic tape pulled out from the reel is In a magnetic tape recording / reproducing apparatus in which a tension pole provided on a tension arm and an impedance roller are brought into contact with each other, a tension adjusting position is provided which supports the tension arm so that the tension arm can swing and the tension of the magnetic tape can be adjusted by the tension pole. A support member that moves according to the movement of the loading pole according to a mode on a locus including an unadjustable position where the tension of the magnetic tape cannot be adjusted, and the impedance roller contact the magnetic tape in the pulled-out state. Operating position and moving gauge of the loading pole A magnetic tape recording / reproducing device, which is movably supported between an evacuation position located outside, and an avoidance mechanism which engages with the supporting member to move the impedance roller to the evacuation position when the loading pole moves. apparatus. 3. A pair of reel driving members are rotatably arranged side by side on a chassis, and a cassette housing, in which a cassette is loaded, is movably supported above the reel driving members, and the cassette housing is lowered. The cassette housing with the supply reel and the take-up reel of the cassette mounted on the reel driving member, and the cassette housing is locked to the chassis by the lock mechanism, and is mounted between the supply reel and the take-up reel. The drawn magnetic tape is drawn out by a loading pole in at least one mode and wound around a drum having a rotating magnetic head, and the magnetic tape drawn out from the reel is brought into contact with a tension pole provided on a tension arm to thereby perform tape tension. In the magnetic tape recording / reproducing apparatus for adjusting the A support member that is swingably supported and moves according to a mode on a locus including a tension adjusting position where the tension of the magnetic tape can be adjusted by the tension pole and an unadjustable position where the tension of the magnetic tape cannot be adjusted. And connecting the support member and the lock mechanism so that when the support member moves to a position corresponding to a predetermined mode, the locking between the cassette housing and the chassis by the lock mechanism is released. Magnetic tape recording / playback device configured. 4. A pair of reel drive members capable of mounting a pair of reels on a chassis are rotatably arranged side by side, and at least one of the reel drive members is provided with a brake mechanism capable of controlling the rotation thereof. In one of the two modes, the magnetic tape loaded between the reels on the reel driving member is pulled out by a loading pole and wound around a drum having a rotating magnetic head, and the magnetic tape pulled out from the reel is provided on a tension arm. In a magnetic tape recording / reproducing apparatus in which a tension arm is brought into contact to adjust the tape tension, and the rotation of the reel driving member is controlled by the brake mechanism in at least one other mode, the tension arm is swingably supported. The tension adjusting position where the tension of the magnetic tape can be adjusted by the tension pole. While providing a support member that moves in accordance with the mode in a locus including an unadjustable position where the tension of the magnetic tape cannot be adjusted, the position is changed, the support member and the brake mechanism are connected, and the brake mechanism is A magnetic tape recording / reproducing apparatus, characterized in that braking and releasing of the reel driving member are performed according to the position of the supporting member.