JPH0810865Y2 - Magnetic tape recording / playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a magnetic tape recording / reproducing apparatus such as a video tape recorder (VTR).

(Prior Art) A VTR performs recording and reproduction by winding a magnetic tape wound between reels around a drum having a rotating magnetic head over a predetermined angle range. In such a VTR, a loading pole is erected on a pole base that moves along a predetermined locus, and the pole base is positioned at one end (unloading position) of the locus when loading a tape cassette, etc. The tape is loaded so that it is moved toward the end (loading completion position), and the tape is pulled out by the loading pole and wound around the drum. In such a VTR, a tension arm provided with a tension pole is arranged near the reel stand on the supply side, etc., and the tension pole is urged by a spring during recording or reproduction to come into contact with the tape. The tension of the magnetic tape is adjusted by varying the braking force of the supply reel stand by the brake band by swinging the tension arm due to the change in tension.

The above-mentioned VTR is known from Japanese Patent Application No. 63-225949.

(Problems to be solved by the invention) However, in the above-mentioned VTR, the tension arm is supported by the cabinet side member such as the chassis and the swing center is fixed, so that there is a large space in the moving area of the tension arm. However, there is a problem in that the arrangement positions of other components of the tape running system are limited, the degree of freedom in position determination is poor, and the tape running system becomes large.

The present invention has been made in view of the above problems, and provides a magnetic tape recording / reproducing apparatus capable of downsizing a tape running system and having a great degree of freedom in determining the positions of components of the tape running system. With the goal.

(Means for Solving the Problems) In a magnetic tape recording / reproducing apparatus according to the present invention, a magnetic tape loaded between reels in a cassette is pulled out of the cassette at the time of tape loading, and the pulled-out magnetic tape is used. The magnetic tape is attached to the tension pole on the tension arm urged by the tension spring in the recording mode or the reproduction mode by winding the drum rotatably provided on the chassis over a predetermined angle range to form a predetermined traveling path. In a magnetic tape recording / reproducing apparatus which adjusts the tension of the magnetic tape by swinging the tension arm while making contact with the magnetic tape, the magnetic tape recording / reproducing apparatus is movable relative to the mounted cassette, and is mounted on the chassis during tape loading. A slide plate that moves linearly in the direction of the drum, and a tip While supporting the tension pole, the base end is swingably supported by a support pin provided on the slide plate, and moves in the drum direction integrally with the slide plate via the support pin, and the slide plate When the slide plate corresponding to the recording mode or the reproducing mode is moved, the magnetic tape is pulled out of the cassette through the tension pole while the swing is restricted by the guide means provided on the chassis during the movement of the slide plate. A tension arm that is allowed to swing so as to adjust the tension of the magnetic tape via the tension pole after the swinging restriction by the guide means is released, and a predetermined relative movement is provided to the slide plate. And the slide play is performed while the swing of the tension arm is restricted. And a limit member that moves integrally with the slide plate when the tension arm is allowed to swing, and a limit member that moves independently on the slide plate, and moves the slide plate and the limit member to lock them at predetermined positions. A driving and locking mechanism is provided between the slide plate and the limit member, and the elastic force is increased by the independent movement of the limit member during the recording mode or the reproduction mode to press the slide plate. And a spring for urging the support pin provided on the slide plate so as to prevent the support pin from moving.

(Operation) In the present invention, the movable support member is provided, and the tension arm is supported by this support member. Therefore, the tension arm can be avoided to operate according to changes in the tape path, etc. Greater freedom is given to decisions, and the tape running system can be made smaller. In the recording and reproducing mode, the limit member prohibits the movement of the supporting member to fix the swing fulcrum of the tension arm, so that the tape tension can be adjusted stably.

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

1 to 8 show a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention, and FIG. 1, FIG. 2, FIG. 3 and FIG. 5 is a partially enlarged plan view, FIG. 6 is a perspective view of a main part, FIG. 7 is a plan view of one main part, FIG. 8 is a plan view of another one main part, and FIG. 9 is a tape. It is a schematic diagram of a running system.

In FIG. 9, 11 is a main chassis, and a supply reel base 12 and a take-up reel drive gear 13 are rotatably juxtaposed to the lower part of the chassis 11 in the drawing.
A cassette housing (not shown) in which a cassette is loaded is supported above 3 so as to be movable up and down. The supply reel base 12 and the take-up reel drive gear 13 are connected to a capstan motor (not shown) and driven integrally with a capstan described later. As is well known, the cassette accommodates the magnetic tape 16 wound between a supply reel 14 and a take-up reel 15 in a case (not shown), and the supply reel 14 is lowered when the cassette housing descends. The outer peripheral gear of the lower flange of the take-up reel 15 placed on the table 12 is the take-up reel drive gear.
Mesh with 13. Reference numeral 17 is a guide pole provided on the case of the cassette.

A drum 18 is supported on the chassis 11 at an upper portion in the drawing, and the loading guide pole 1 is provided on the left side of the drum 18 in the drawing.
9, loading tilt pole 20, impedance roller 2
1, inclined pole 22 and tension pole 23 described later
On the right side of the drum 18 in the figure, the loading guide pole 2
4. A loading tilt pole 25, a tilt pole 26, a middle pole 27, an A / C head 28, a guide roller 29, a pinch roller 30 and a capstan 31 are arranged. 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 (not shown), and similarly, the loading guide pole 24 and the loading tilt pole 25 are also supported by the pole base, and these pole bases are supported so as to be movable in a predetermined locus. It is driven by a mode control motor (not shown). These loading poles 19,2
0, 24, 25 (hereinafter collectively referred to as a reference symbol LP) move upward in the drawing at the time of loading, and the magnetic tape is removed from the cassette.
16 is pulled out and wound around the drum 18 over a predetermined angle range (see FIG. 9), and at the time of unloading, the magnetic tape 16 is stored in the cassette by moving in the direction opposite to the loading direction.

The drum 18, impedance roller 21, inclined poles 22 and 26, middle pole 27, A / C head 28, guide roller
The description of 29, the pinch roller 30, and the capstan 31 is omitted.

As shown in FIGS. 1 to 4, the tension pole 23 is erected on the tip of a tension arm 32, and the tension arm 32 has a base end swingably supported by a slide plate (support member) 33. . The slide plate 33 is supported on the upper surface of the chassis 11 so as to be slidable in the vertical direction in the figure. In other words, the slide plate 33 is a cassette (not shown).
From the side toward the drum 18 side shown in FIG. 9, and further, as shown in FIG. 6, a limit plate (limit member) 34 is slidably provided on the slide plate 33. ing. As shown in detail in FIG. 8, the slide plate 33 has guide slots 33a and 33b extending vertically in the lower portion and the central portion of the figure, respectively. 33b is formed with a locking hole 33c, an elongated hole 33d extending vertically in the upper part of the drawing, and a spring locking part 33e, a cam face 33f and a stepped engaging part 33g in the lower part of the drawing. , The support pin 35 near the upper edge of the slot 33a.
Is erected. Slide plate 33 has long holes 33a, 33
Guide pins 36a and 36b that are erected on the upper surface of the chassis 11 are slidably inserted in b, and the drive lever 3 described later is inserted in the locking hole 33c.
The drive pin 37a provided in 7 is loosely inserted, and the spring 38 whose lower end in the drawing is locked to the lower edge of the elongated hole 33d in the drawing is arranged in the elongated hole 33d. The slide plate 33 is driven by the swing of the drive lever 37, and the guide pins 36a and 36b slide in the elongated holes 33a and 33b to move vertically in the drawing.

Although not explicitly shown in the figure, a pin of the plate slides on the cam face 33f of the slide plate 33 and is connected to the take-up reel drive gear 13 through which the pin of the plate meshes with the brake mechanism of the transmission gear. The engaging portion 33g engages with the cancel plate to release the housing lock mechanism.

As shown in FIG. 7, the limit plate 34 has an elongated hole 34a for arranging a spring and an elongated hole 34b for a guide in the upper part of the figure, and an elongated hole 34c for a guide in the lower part of the figure. A locking hole 34d that extends to the left and right in the drawing is formed close to the upper edge, and a restraining portion 34e that can contact a later-described guide pin 43 of the tension arm 32 is provided in the lower right portion of the drawing. Restraint 3
The reference numeral 4e 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 99b inclined by a predetermined angle, and the guide pins are in sliding contact with these cam surfaces 99a, 99b. 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 freely through the locking hole 33c of the slide plate 33. Therefore, the drive lever 37 serves as a drive member for driving the slide plate 33 and the limit plate 34. 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,
The slide plate 33 and the limit plate 34 are urged in the direction in which the guide pins 39a, 39b come into contact with the upper edges of the elongated holes 34b, 34c. This limit plate 34 and slide plate 33
Is driven by the drive pin 37a of the drive lever 37 and coupled by the spring 38 to enable relative displacement corresponding to the lengths of the elongated holes 34b, 34c, and as will be described later, the guide pin on the restraint portion 34e at a predetermined position. 43 slides into contact. The locking hole 33c of the slide plate 33, the locking hole 34d of the limit plate 34, and the drive lever 37 described above constitute a drive and locking mechanism 101.

Although not explicitly shown in the figure, the limit plate 34 contacts the arm supporting the impedance roller 21 described above when the loading pole LP moves upward in the figure, and moves the impedance roller 21 to the outside of the locus of movement of the loading pole LP. Prevent interference.

The tension arm 32 includes a base portion 32a and an arm portion 32b integrally extending from the base portion 32a, and the base portion 32a is a support pin.
It is supported by 35 so as to be rotatable relative thereto, and the tension pole 23 is supported at the tip of the arm portion 32b. The base portion 32a is a support pin 3
An arc-shaped adjustment hole 40a centered on 5 is formed,
32b has a screw hole corresponding to the adjustment hole 40a, and the base 32a
The arm portion 32b is fixed so that the relative position in the rotational direction can be adjusted by a screw 50 penetrating the adjustment hole 40a and screwed into the screw hole.

The base portion 32a is vertically separated from each other on the left side in the drawing, and both ends of the brake band 41 are fixed to the base portion 32a, and a locking portion 40c is formed on the left side in the drawing to lock the end portion of the tension spring 42. . The brake band 41 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. The tension spring 42 has a locking portion 40c of the base 32a.
And the engaging portion 33e of the slide plate 33 are stretched to urge the tension arm 32 counterclockwise in the figure.

On the arm portion 32b, the above-mentioned tension pole 2 is attached to the tip.
3 is erected, 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. In this guide groove 11b, a portion 49a extending substantially vertically in the drawing and a portion 49b extending substantially horizontally in the drawing are smoothly continuously formed.
Is a guide groove 11a for an escape hole of the drive pin 37a described later.
In succession. Here, the guide grooves 11a and 11b formed in the chassis 11 serve as guide means when the tension arm 32 moves in the drum direction. Also, the guide groove 111b
As will be described later, the portion 49a is defined as a portion that prevents the tension arm 32 from swinging, and the portion 49b is defined as a portion that allows the tension arm 32 to swing.

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 (not shown) that meshes with the gear 44b, and is driven by the mode control motor in conjunction with the pole pace 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 swingably supports a tension arm 32 having a tension pole 23 provided at its tip, and a tape cassette is ejected (EJECT). , Tape 16 fast forward or rewind (FF / REW),
Pause (REC LOCK), Play (PLAY) and Stop (STO
The mode control motor is energized according to the operation of the operation button such as P) to drive the loading pole LP and simultaneously move the slide plate 33 to the position corresponding to the mode.
Therefore, as will be described later, even if the tape path changes depending on the mode, the tension arm 32 should be attached to the loading pole.
The tension arm 32 can be moved to a position where it does not interfere with the LP or tape 16, etc.
The tape running system can be made smaller by installing it near the locus of
Further, a great degree of freedom can be obtained in determining the arrangement positions of other components such as the tilt pole 22.

Each mode will be described below. For example, when mounting the cassette, the cam gear 44 is in the FF / REW mode position shown in FIG. 2, and the pin 37b of the drive lever 37 is in the cam hole 44a.
Is positioned slightly inward from the end of the slide plate 33, the slide plate 33 is also positioned near the lower side in the figure, and the fulcrum of the tension arm 32, that is, the support pin 35 is also positioned near the lower side in the figure. Then, in the tension arm 32, the guide pin 43 is formed in the portion 4 of the guide groove 11b.
It is located in the lower part of 9a and its left and right movements are restricted, so that the movement of the tension pole 23 is also restricted. Although not shown, the tension pole 23 is located at a position corresponding to the cutout portion in the lower portion of the front surface of the cassette, and each loading pole LP is also located at a position corresponding to the cutout portion of the cassette. The cassette housing can be lowered by loading and can be loosely inserted into the lower cutout portion of the cassette.

Here, when the cassette is installed, the REC LOCK in Fig. 3
As shown in the mode, the cam gear 44 is driven by a mode control motor (not shown) and rotates counterclockwise by a predetermined angle from the state shown in FIG. 2, and the drive lever 37 causes the slide plate 33 and the limit plate 34 to move integrally. Since the support pin 35 moves upward in the figure as it moves upward by a predetermined distance, the guide pin 43 of the tension arm 32 also slides in the portion 49a of the guide groove 11b and moves to the portion 49b to move the whole. Will be done. Then, at this time, in the limit plate 34, the parallel cam surface 99a of the restraint portion 34e is located at the connecting portion between the guide groove 11b and the guide groove 11a, and the guide pin 43 is biased by the spring 42 on the parallel cam surface 99a. Because of the contact, the movement of the guide pin 43 in the left direction in the drawing is blocked, the movement of the tension arm 32 is restricted, and the tension servo mechanism is held in the inoperative state. The tension pole 32 is located at an inner position where the tape tension is weakened, so that the tension of the tape 16 which has been passed through the tape and stopped running is slackened so that the tape is not damaged.

Next, when the PLAY or REC operation button is operated (PLAY or REC mode), the cam gear 44 further rotates counterclockwise by a predetermined angle as shown in FIG.
Then, the drive lever 37 causes the limit plate 34
Only moves further up in the figure, and the limit plate 34
Since e releases the guide groove 11b, the tension arm 32 also has the guide pin 43 in a free state and is rotated counterclockwise by the urging force of the spring 42, and the tension pole 23 moves leftward in the figure to move the tape 16 A tension servo mechanism that applies tension to the actuator operates. That is, when the tension of the tape 16 is small and the tension arm 32 relaxes, the elastic force of the spring 42 rotates counterclockwise in the figure to increase the braking force to the supply reel base 12 by the band brake 41,
When the tension of the tape 16 is large, the tape 16 is rotated clockwise to loosen the brake band 41 to weaken the braking force applied to the supply reel base 12, thereby swinging the tape 16 according to the tension of the tape 16. Then, the braking force of the supply reel base 12 is controlled to adjust the tension of the running tape 16 to be constant. In addition,
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. This reliably prevents the slide plate 33 from moving due to an external load, etc., and fixes it at the same position, that is, the fulcrum of the tension arm 32 is fixed,
A stable and reliable tension servo mechanism can be obtained.

When the PAUSE operation button is operated here, the state shown in FIG. 3 is brought about, and the cam gear 44 rotates clockwise by a predetermined angle in the figure, so that the limit plate 34 is again returned.
Only the lower part of the limit plate 34
As a result, the guide pin 43 is pressed rightward in the figure to hold the tension arm 32 in a state where the tension pole 23 moves in the direction in which the tension of the tape 16 is relaxed (inward direction), which is the same as described above.

When the FF / REW operation button is operated, the state shown in FIG. 2 described above is set, the cam gear 44 operates in the opposite manner to the above, and the tension pole 23 is again in the notch in the lower portion of the front surface of the cassette. 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.

Also, when the STOP operation button is operated instead of the FF / REW operation button, the above-mentioned second operation is performed as in the FF / REW mode.
The state shown in the figure is reached, and the running of the tape 16 is also stopped in this state.

Then, when the operation button of EJECT is operated, as shown in FIG. 1, the cam gear 44 rotates counterclockwise by a predetermined angle from the state shown in FIG.
The pin 37b of 37 is located at the end of the cam hole 44a, and the slide plate 33 is also located further downward in the figure. The cassette housing (not shown) is unlocked and raised to eject the cassette.

In the above-described embodiment, the tension arm 32 is controlled by moving the slide plate 33. However, for example, the tension servo mechanism is operated from the unloading position of the tension pole 23 located in the notch of the cassette. 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).

(Effect of the Invention) As described above, according to the magnetic tape recording / reproducing apparatus of the present invention, the tension arm having the tension pole is swingable on the slide plate movable from the cassette side toward the drum side. Since they are integrally supported, when the slide plate moves to the drum side, it is possible to avoid interference with other parts related to the tension arm around the tape traveling system, and to downsize the tape traveling system. be able to.

Further, a limit member is provided on the slide plate so as to be relatively movable, and a spring is provided between the slide plate and the limit member so that the slide plate and the limit member move during the recording mode or the reproduction mode. , When the tension pole on the slide plate reaches the adjustable position where the tension of the magnetic tape can be adjusted, the limit member moves further independently and the elasticity of the spring interposed between the slide plate and the limit member. By increasing the force and crimping the slide plate by the elastic force of this spring, the movement of the support pin that supports the tension arm is blocked, and as a result, there is rattling accompanying the movement of the slide plate. However, since the support pin that serves as the fulcrum of the tension arm is supported in a fixed state, the tension With it is possible to perform tension adjustment of the magnetic tape reliably and stably by Paul, at this time are those provides the unique effects of the present invention proposed such is blocked from the external load even movement of the slide plate due certainty.

[Brief description of drawings]

1 to 8 show a tape running mechanism of a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention, which is a main part in a state where FIG. 1, FIG. 2, FIG. 3 and FIG. 4 are different. A plan view, FIG. 5 is a partially enlarged plan view, FIG. 6 is a perspective view of a main part, FIG. 7 is a plan view of one main part, FIG. 8 is a plan view of another one main part, FIG. 9 is a schematic diagram of the tape running system. 11 ... Main chassis, 11a, 11b ... Guide means, 14 ... Supply reel, 15 ... Take-up reel, 16 ... Magnetic tape, 18 ... Drum, 23 ... Tension pole, 32 ... Tension arm, 33
... Slide plate (support member), 34 ... Limit plate (limit member), 35 ... Support pin, 37 ... Drive lever, 38 ... Spring, 42 ... Tension spring, 43 ...
Guide pin, 101 ... Drive and locking mechanism.

Claims (1)

[Scope of utility model registration request] 1. A magnetic tape hooked between reels in a cassette is pulled out of the cassette at the time of tape loading, and the pulled magnetic tape is wound around a drum rotatably mounted on a chassis over a predetermined angle range. The magnetic tape is rotated to form a predetermined traveling path, and the magnetic tape is oscillated while the magnetic tape is in contact with the tension pole on the tension arm urged by the tension spring in the recording mode or the reproduction mode. A magnetic tape recording / reproducing apparatus for adjusting the tension of a slide plate, which is movable relative to the mounted cassette and linearly moves in the direction of the drum on the chassis during tape loading, Support the tension pole at the tip and slide the base end at the slider. It is swingably supported by a support pin provided on the plate, moves integrally with the slide plate in the drum direction through the support pin, and is guided by guide means provided on the chassis during the movement of the slide plate. The magnetic tape is pulled out of the cassette through the tension pole while the swing is regulated, and the swing regulation by the guide means is released when the slide plate corresponding to the recording mode or the reproduction mode is moved to release the tension. A tension arm that is allowed to swing so as to adjust the tension of the magnetic tape via a pole and a predetermined relative movement that is provided to the slide plate, and the swing of the tension arm is restricted. While moving together with the slide plate, the tension arm allows swinging A limit member that moves independently on the slide plate when the slide plate is moved, a driving and locking mechanism that moves the slide plate and the limit member to lock the slide plate at predetermined positions, respectively, and the slide plate and the limit member. Is interposed between the support pins provided in the slide plate by pressurizing the slide plate by increasing the elastic force by the independent movement of the limit member in the recording mode or the reproduction mode. A magnetic tape recording / reproducing apparatus having a spring for urging the magnetic tape.