JP3169375B2 - Reel base drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The reel base drive mechanism of the present invention will be described in detail according to the following items.

A. Industrial application fields B. Summary of the invention C. Prior art D. Problems to be solved by the invention E. Means to solve the problems F. Embodiment a. Reel base drive mechanism [FIGS. 8] a-1. Reel base [FIGS. 1 to 6, FIG. 8] a-2. Swing lever, swing gear [FIGS. 1 to 6]
Figures, FIG. 8] a-3. Drive system, coil springs [FIGS. 2, 4 to 6] a-4. Mode slider, gear pressing portion, position regulation of swing gear [FIGS. FIGS. 5 and 7] a-5. Operation [FIGS. 1 and 8] b. Other Configurations [FIGS. 2 to 4, 6, and 8]
Figure] b-1. Head drum, capstan, pinch roller, etc. [FIGS. 2 and 3] b-2. Tape loading, formation of mode [second]
FIG. 3, FIG. 3] b-3. Brake mechanism [FIG. 2, FIG. 4, FIG.
FIG. 8] G. Effects of the Invention (A. Industrial Application Field) The present invention relates to a novel reel base driving mechanism. Specifically, either one of the two reel bases is selectively
The present invention relates to a reel stand driving mechanism for rotating at a rotation speed according to the tape running mode, and more particularly to a reel stand driving mechanism for a tape running apparatus having a slider that selectively forms a plurality of modes by being moved. Yes,
An object of the present invention is to provide a novel reel base driving mechanism that can be configured at low cost with a small number of members without impairing required functions such as a function of switching a rotation force input system for the reel base.

(B. Summary of the Invention) The reel base drive mechanism of the present invention arranges a low-speed gear for low-speed running of tape and a high-speed gear for high-speed running of tape on two reel bases coaxially with its reel engagement shaft, and drives the reel. The swing gear that is rotated by the system and selectively meshed with one of the two reel bases can be displaced in its axial direction, that is, the position between the position corresponding to the high-speed gear and the position corresponding to the low-speed gear is changed. The switching between the two positions of the swing gear and the holding at that position are performed by a mode forming slider and a resilient means, whereby the rotational force on the reel base is adjusted. Thus, it is possible to reduce the cost by using a small number of members without impairing the required functions such as the input system switching function.

(C. Prior Art) For example, in a tape running device such as a tape player, usually, a tape reel is engaged and a reel base rotating integrally therewith is rotated, or another tape running device is rotated. Means, for example, the tape is run in cooperation with a capstan and a pinch roller and the like, and the rotation speed and the rotation torque of the reel base are changed according to the running purpose of the tape. .

A mechanism for rotating the reel base in this way is a reel base drive mechanism, and there are various types of such a reel base drive mechanism in the related art. For example, a rotor of two brushless motors of a flat facing type is used. A direct drive type that is separately coupled to the shafts of two reel bases, or one oscillating gear that meshes with one of the two reel bases according to the tape running direction and the oscillating gear is rotated. One using a brushless motor, or transmitting the rotational force of a normal brush motor to a swing gear via a speed change system, and further using a drive system including a motor for high speed and low speed. Are provided.

(D. Problems to be Solved by the Invention) The above-mentioned various conventional reel base driving mechanisms have the following problems.

That is, in a direct drive type reel base driving mechanism or a reel base driving mechanism using one brushless motor and a swing gear, the rotation speed and the rotation torque of the reel base can be electrically controlled. Therefore, there are advantages such as a wide variable range and a relatively small number of mechanical parts, but the brushless motor is extremely expensive, and a control circuit for controlling the brushless motor has a considerable cost. However, there is a problem that the cost of the reel base driving mechanism becomes very high.

In this respect, the reel base drive mechanism using a normal brush motor as a drive source has an advantage that the cost can be relatively reduced. However, this kind of reel base drive mechanism has a transmission system for changing the reduction ratio between high speed and low speed, and a transmission system for transmitting the rotational force of the motor to the reel base,
Select either a system with a torque limiter or a system without a torque limiter and insert it into the reel base through an input system switching means, or use a drive system dedicated to high speeds and a drive system dedicated to low speeds Therefore, there is a problem that the number of parts and the number of assembling steps are required, and the size is increased.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, a reel base drive mechanism of the present invention provides a reel engagement shaft, a low-speed gear for low-speed running of a tape, and a tape for low-speed running of the tape. Two reel bases having a high-speed gear for high-speed traveling, a drive gear rotated by motor driving, and a drive gear provided between the two reel bases,
The swing gear, which is supported movably in the axial direction between a position corresponding to the high-speed gear and a position corresponding to the low-speed gear, is meshed with the drive gear, and the swing gear is rotated while the drive gear is rotated. By being rotated, the swing lever is supported so as to be rotatable in the rotation direction of the drive gear together with the swing gear around the rotation axis of the drive gear, and the swing gear is attached to a position corresponding to the low-speed gear. And a slider that forms at least a stop mode and a play mode by being moved to a position corresponding to a predetermined mode, and is loaded with the movement of the slider from the initial position to the stop mode position. A pair of loading units that pull out the tape from the tape cassette, move along the guide formed on the chassis, and wind the drawn tape around the head drum. And a pinch roller rotatably provided on the tip side by being rotatably provided on the chassis and being rotated in accordance with the movement of the slider from the stop mode position to the play mode position. And a pinch roller lever for holding the tape, and a gear pressing portion provided at a position facing the swing lever of the slider, and the tape cassette is loaded by a pair of loading portions as the slider moves to the stop mode position. As the swing lever is pressed by the gear pressing portion, the swing gear is moved to a position corresponding to the high-speed gear, and further, the swing lever rotates and swings according to the rotation direction of the drive gear. The gear is selectively engaged with the high-speed gear of each reel base, so that the tape is moved at high speed in the forward direction or the reverse direction, and the tape is slid. Is moved to the play mode position, the pinch roller lever is rotated, the tape is pinched by the pinch roller and the capstan, and the pressure on the rocking lever by the gear pressing portion is released, so that the rocking lever is resilient. The swinging gear is moved to a position corresponding to the low-speed gear together with the swing gear by the urging force of the swing gear, and furthermore, the swing lever is rotated according to the rotation direction of the drive gear, and the swing gear is selectively connected to the low-speed gear of each reel base. The engagement allows the tape to run at a low speed in the forward or reverse direction.

Therefore, according to the reel base driving mechanism of the present invention, the control of the input system of the rotational force to the reel base required according to the difference in the tape running mode can be performed by switching the position of the swing gear in the axial direction. The switching of the position of the oscillating gear can be performed by using a slider for selectively forming various modes. In addition, one drive system can be commonly used for two reel bases. Therefore, the number of members dedicated to the reel base drive mechanism is extremely small, and there is no need to use a brushless motor for the drive source, so that the reel base drive mechanism can be manufactured at low cost without impairing the required functions. Can be configured.

(F. Embodiment) Hereinafter, details of the reel base driving mechanism of the present invention will be described with reference to the illustrated embodiment.

In the illustrated embodiment, the reel base drive mechanism of the present invention is
This is applied to a reel base drive mechanism in a rotary head type digital audio tape recorder (hereinafter, referred to as “R-DAT” B) 1.

(A. Reel base driving mechanism) [FIGS. 1 to 8] 2 is a mechanical chassis, 3 is a front portion of the mechanical chassis 2 (a direction toward the lower right in FIG. In addition, the direction toward the lower left in the figure is defined as the left side, and the direction toward the upper right is defined as the right side. It is a sub-chassis arranged to face in parallel.

Reference numeral 4 denotes a reel stand driving mechanism, which includes two reel stands, one swing gear selectively meshed with one of the gear portions of the two reel stands, and a swing supporting the swing gear. It comprises a lever, a drive system for rotating the oscillating gear, and a gear pressing portion provided on a mode slider for mode formation.

(A-1. Reel base) [FIGS. 1 to 6, 8] Reference numerals 5 and 5 'denote reel bases.

The reel bases 5 and 5 ′ are positioned concentrically outside the cylindrical portions 6 and 6 having a substantially cylindrical shape which is long in the vertical direction and lower end portions 6 a and 6 a of the cylindrical portions 6 and 6 having large diameters. An axially short cylindrical brake drum 7, 7 formed integrally with the cylindrical portion 6, 6, and a high-speed gear 8, 8 connected to the upper end of the brake drum 7, 7; Low-speed gears 9, 9 in the form of spur gears having substantially the same diameter as the high-speed gears 8, 8, and rotating bodies 10, 10 projecting upward from the center of the low-speed gears 9, 9 and having a cylindrical shape; Lead engaging shafts 11 and 11 coupled to the upper portions of the cylindrical portions 6 and 6 so as to be slidable in the axial direction and to rotate integrally with the cylindrical portions 6 and 6, and holes in the cylindrical portions 6 and 6. Retaining members 12, 12 which are press-fitted and fixed to the upper end portions of the upper and lower surfaces of the cylindrical portions 6, 6, and upper surfaces of flange-like shoulder portions 6b, 6b projecting from positions near the lower end portions 6a, 6a. Adhered to the friction plate 13,
13 and coil springs 14, 14 and the like. The rotating bodies 10, 10 have cylindrical portions 6, 6 such that the low-speed gears 9, 9 are placed on the shoulder portions 6b, 6b with the friction plates 13, 13 interposed therebetween. The reel engaging shafts 11, 11 are prevented from being pulled upward from the cylindrical portions 6, 6 by the flange portions of the retaining members 12, 12, and are mounted on the upper surface of the rotating body 10. The upward movement force is urged by the resilient force of the coil springs 14, 14 contracted between the spring receivers 15, 15, and the coil springs 14, 14
The low-speed gears 9, 9 are formed by the elastic force of the shoulders of the cylindrical portions 6, 6.
6b and 6b are also pressed.

Reference numerals 16 and 16 denote reel stand supporting shafts which stand on the upper surface of the sub-chassis 3 at positions spaced apart from each other in the left-right direction. The cylindrical portions 6 and 6 are rotatably fitted to the reel stand supporting shafts 16 and 16. ing.

The upper portions of the reel bases 5, 5 'protrude upward through holes 2a, 2a formed in the mechanical chassis 2.

Thus, when a rotational force is input to the high-speed gears 8, 8, the cylindrical portions 6, 6 integrated therewith are rotated, and the reel engaging shafts 11, 11 are rotated integrally therewith. When a rotational force is input to the low-speed gears 9, 9, the rotation is transmitted to the cylindrical portions 6, 6 through the friction plates 13, 13, and the cylindrical portions 6, 6 are rotated. When the engagement shafts 11, 11 are rotated and the load applied to the reel engagement shafts 11, 11 exceeds the limit torque between the friction plates 13, 13 and the low-speed gears 9, 9, the low-speed gears 9, 9 are used. And the cylindrical portions 6 and 6 will slip.

(A-2. Swing lever and swing gear) [FIGS. 1 to 6,
FIG. 8] 17 is a swing lever. The swing lever 17 is long in the front-rear direction, and the rear half thereof has a step in the middle so as to be located slightly lower than the front half thereof.
Is provided at the front end, and a cylindrical portion 19 is provided at the front end.
The upper end of the hole 19 a of 19 is opened on the upper surface of the swing lever 17.

Relatively small pressed projections 20 are formed on the upper and lower sides of the swing lever 17 on both front and rear sides of the hole 19a.

Reference numeral 21 denotes a swing gear having a spur gear shape, which has a diameter substantially half the position of the high-speed gears 8, 8 and the low-speed gears 9, 9.
A concave portion 21a is formed on the upper surface thereof, and a through hole 21b penetrating the center portion is formed, and the gear support shaft 18 is slidably and rotatably inserted into the through hole 21b,
It is mounted on a washer 22 attached to an intermediate portion of the gear support shaft 18, and is contracted between a spring receiving seat 23 mounted on the bottom surface of the concave portion 21a and a lower surface of the swing lever 17. It is in frictional contact with the swing lever 17 via the coil spring 24.

Reference numeral 25 denotes a gear support shaft provided on a support member (not shown) fixed to the lower surface of the sub-chassis 3, and is disposed at an intermediate position between the two reel bases 5 and 5 'when viewed from the front and rear. Most of them are located so as to protrude upward from the sub-chassis 3.

Then, the swing lever 17 has two reel bases 5 and 5 '.
Between the gear support shaft 2 and the hole 19a of the cylindrical portion 19.
5 is rotatably and slidably inserted, whereby the swing lever 17 is supported so as to be rotatable in the horizontal direction and displaceable in the up and down direction.

(A-3. Driving System, Coil Spring) [FIGS. 2 and 4 inward view FIG. 6] Reference numeral 26 denotes a driving system.

Reference numeral 27 denotes a brushed motor serving as a drive source of the drive system 26, which is fixed to the upper surface of the sub-chassis 3 and has a rotating shaft 27a.
Drive pulley on the part protruding below the sub-chassis 3
28 is fixed.

29 is a driven pulley, 30 is a substantially cylindrical drive gear having an open upper surface, and the driven pulley 29 and the drive gear 30 are formed integrally and coaxially, and rotate below the gear support shaft 25. The driven pulley 29 is positioned below the sub-chassis 3 and the drive gear 30 is positioned above the sub-chassis 3. The swing gear 21 is meshed with the drive gear 30 from behind.

Reference numeral 31 denotes an endless belt stretched between a driving pulley 28 and a driven pulley 29. Accordingly, when the motor 27 is rotated, the driving gear 30 is rotated.
Is rotated.

32 is a retaining ring fitted onto the gear support shaft 25 in a press-fit manner,
33 is a spring seat which is fitted on the gear support shaft 25 and the cylindrical portion 19 of the swing lever 17 and is mounted on the inner bottom surface of the drive gear 30.
The coil spring 33 is contracted between the lower surface of the swing lever 17 and the lower surface of the swing lever 17, and the upward movement of the swing lever 17 is urged by the elastic force of the coil spring 33.

The retaining ring 32 is for preventing the swing lever 17 from coming off the gear support shaft 25 during assembly.

(A-4. Restriction of Position of Mode Slider, Gear Pressing Unit, and Swing Gear) [FIGS. 1 to 5 and FIG. 7] Reference numeral 35 denotes a mode slider.

The mode slider 35 has a substantially rectangular plate shape long in the left-right direction when viewed from above, and is supported by a guide member (not shown) fixed to the lower surface of the mechanical chassis 2 so as to be movable in the left-right direction. A rack 36 formed on the lower surface is engaged with a pinion gear 38 at an output stage of a drive system 37 (shown only in FIG. 4) provided on the upper surface of the sub-chassis 3, and the rack 36 is moved by the pinion gear 38. It is moved by being sent, and the movement includes the initial position shown in FIG. 2, that is, the left end position in the movement range, the play position shown in FIG. 3, ie, the right end position in the movement range, and the first position.
This is performed between the stop position indicated by the one-dot chain line in FIG. 7A, that is, the position slightly returned to the left from the play position.

Reference numeral 39 denotes a left-right long opening formed at the center of the mode slider 35 in the front-rear direction.
Is inserted through the opening 39.

Reference numeral 40 denotes a horizontally elongated hole formed substantially in the center of the opening 39 at a position close to the front side edge, and the upper end of the gear support shaft 25 is inserted through the elongated hole 40.

41, 41 are ridge-shaped gear pressing portions formed on the lower surface of the mode slider 35, are formed so as to extend parallel to each other in the left and right direction, and their left end edges 41a, 41a are inclined downward to the right. It is formed and the lower edges 41b, 41b extend horizontally.

The gear pressing portions 41, 41 are separately arranged at the front and rear sides of the long hole 40, and accordingly, the gear pressing portions
Numerals 41, 41 are provided so as to be moved from above to the two pressed projections 20, 20 provided on the swing lever 17 through respective opposing positions, and the mode slider 35 comes to the initial position. In the state in which the gear pressing portions 41, 41 have lower edges 41b, 4
The right end of 1b is opposed to the pressed projections 20, 20 as shown by the solid line in FIG. 1 (A), and the lower edge 41b of the gear pressing portions 4, 4 when the mode slider 35 is at the stop position. , 41b, as shown by the alternate long and short dash line in FIG.
When the mode slider 35 moves to the play position, the gear pressing portions 41, 41 move to the position slightly deviated rightward from the pressed projections 20, 20, as shown in FIG. 1 (B). Is moved.

In the state where the gear pressing portions 41, 41 are opposed to the pressed protrusions 20, 20, the pressed protrusions 20, 20,
The abutment with 1, 41 prevents the swing lever 17 from moving upwardly, so that the swing gear 21 has the same swing gear 21 as the high-speed gear 8, 8 on the reel base 5, 5 '. It is held at a position at the height (hereinafter, referred to as “first position”). When the gear pressing portions 41, 41 are displaced to the right from the pressed projections 20, 20, the swing lever 17 floats by the resilience of the coil spring 33, and the pressed projections 20, 20 are placed on the lower surface of the mode slider 35. The swing gear 21 is moved to a contact position (hereinafter, referred to as a "second position") and held at that position, and in this state, the swing gear 21 is moved to the low speed gears 9, 9 of the reel bases 5, 5 '.
Is located at approximately the same height. When the mode slider 35 is moved leftward from the above state, first, the gear pressing portion
The left edges 41a, 41a of the 41, 41 press the pressed projections 20, 20 substantially downward and left, and then the lower edges 41 of the gear pressing portions 41, 41.
b, 41b are brought into contact with the pressed projections 20, 20, whereby
The swing lever 17 is moved to the first position.

The lower end of the gear support shaft 18 is located in a restriction hole 3a formed in the sub-chassis 3, whereby the rotation of the swing lever 17 is restricted within a certain range.

(A-5. Action) [FIGS. 1 and 8] As described above, when the drive gear 30 is rotated, the swing gear
When the rotational force is urged to the oscillating gear 21 and the oscillating gear 21 is urged to the oscillating gear 21, the rotational direction of the driving gear 30 is the same as that of the drive gear 30 due to the frictional action between the oscillating lever 17 and the oscillating gear 21. Since the rotational force in the direction is urged, the swing lever 17 is rotated, and the rotation is stopped when the gear support shaft 18 comes into contact with the left edge or the right edge of the regulating hole 3a. The swing gear 21 is rotated from the state.

Therefore, when the drive gear 30 is rotated clockwise as viewed from above, the swing lever 17 is in the forward position shown by the solid line in FIG. 8, that is, the gear support shaft 18 is in contact with the right edge of the restriction hole 3a. When the swing lever 17 is moved to the forward position, the swing gear 21 is moved to the high speed gear 8 of the right reel stand 5 '(hereinafter, referred to as "T side reel stand").
Or, it meshes with the low-speed gear 9 and rotates counterclockwise,
Thereby, the high-speed gear 8 or the low-speed gear 9 is rotated counterclockwise. When the drive gear 30 is rotated counterclockwise as viewed from above, the swing lever 17 is in the reverse position shown by a two-dot chain line in FIG. 8, that is, the gear support shaft 18 is at the left edge of the restriction hole 3a. When the swing lever 17 is moved to the reverse position, the swing gear 21 moves the swing gear 21 to the left reel stand 5 (hereinafter referred to as "S-side reel stand").
And rotates in the clockwise direction, thereby rotating the high-speed gear 8 or the low-speed gear 9 in the counterclockwise direction.

When the mode slider 35 is at the stop position, the swing lever 17 is held at the first position. From this state, the motor 27 rotates the drive gear 30 clockwise. When rotated (hereinafter referred to as "forward rotation"), the oscillating gear 21 meshes with the high-speed gear 8 of the T-side reel base 5 ', and rotates the T-side reel base 5' in a clockwise direction (hereinafter, "". Tape winding direction ”).
The motor 27 rotates in the direction opposite to the above rotation direction (hereinafter, referred to as
Say "reverse." ), The swing gear 21 meshes with the high-speed gear 8 of the S-side reel base 5 to rotate the S-side reel base 5 in a counterclockwise direction (hereinafter, referred to as a "tape winding direction"). . When the mode slider 35 is moved to the play position, the swing lever 17 is moved to the second position. The T-side reel base 5 'is rotated in the tape winding direction by meshing with the low-speed gear 9 of the side reel base 5', and when the motor 27 rotates in the reverse direction, the swing gear 21 is rotated by the low-speed gear 9 of the S-side reel base 5. To rotate the S-side reel base 5 in the tape winding direction.

The rotation of the motor 27 when the mode slider 35 is at the stop position is performed at high speed, and the rotation of the motor 27 when the mode slider 35 is at the play position is relatively low speed. Is done.

Thus, when the motor 27 is rotated from the state where the mode slider 35 is at the stop position, the T-side reel base 5 'or the S-side reel base 5 is rotated at a high speed in the tape winding direction,
When the motor 27 is rotated from the state where the mode slider 35 is at the play position, the T-side reel base 5 'or the S-side reel base 5 is rotated in the tape winding direction at a low speed.

The tape running operation in each mode of the reel base rotated in this manner will be described later.

(B. Other configurations) [FIGS. 2 to 4, FIG. 6, and FIG.
Figures] (b-1. Head Drum, Capstan, Pinch Roller, etc.) [FIGS. 2 and 3] Reference numeral 42 denotes a head drum arranged at the rear end of the upper surface of the mechanical chassis 2; It comprises a rotating drum 42b coaxial therewith, and rotating magnetic heads 42c, 42c, etc., which rotate integrally with the rotating drum 42b while being positioned on the outer peripheral portion of the gap between these two drums 42a and 42b.

43, 43 'are fixed tape guides fixed on the upper surface of the mechanical chassis 2, and 44, 44, 44 are tape cassettes on these.
Reference numeral 45 (see FIG. 3) denotes a cassette positioning pin which is detachably mounted.

Reference numeral 46 denotes a capstan disposed on the upper surface of the mechanical chassis 2 at a position slightly diagonally forward from the head drum 42, and is rotated by a capstan motor (not shown) disposed below the mechanical chassis 2.

Reference numeral 47 denotes a pinch low lever, which is rotatably supported by the mechanical chassis 2 and has a pinch roller 48 and a swing guide.
The mode slider 35 is moved when the mode slider 35 is moved.

Reference numerals 50, 50 denote loading blocks for performing tape loading. The loading blocks 50, 50 are provided with loading posts 51, 51 so as to move along guide long grooves 2b, 2b formed on both left and right sides of the head drum 42 of the mechanical chassis 2. The loading arms 52 are supported and connected to the distal ends of the loading arms 52, which extend and contract when the mode slider 35 is moved.

(B-2. Tape loading, formation of mode) [Second
FIG. 3, FIG. 3] In the initial mode, the pinch roller lever 47 and the loading blocks 50 are held at the initial positions shown in FIG. 2, and the mode slider 35 is held at the initial position shown in FIG. Tape cassette 45 is R-
When mounted on the DAT 1, a pinch roller 48, a swing guide 49 and a loading post 51 are provided in a tape pull-out recess 53 provided on the front surface of the cassette case of the tape cassette 45.
51 are relatively positioned, and the supply side tape reel 54 (hereinafter, referred to as “S reel”) and the winding side tape reel 54 ′ (hereinafter, referred to as “T reel”) of the tape cassette 45. Are separately engaged with the reel engaging shafts 11, 11 of the two reel bases 5, 5 '. When a tape loading command is issued from this state, the mode slider 35 is moved to the stop position, the loading arms 52, 52 are extended, and the loading blocks 50, 50 are extended.
Is moved backward, the pinch roller lever 47 is rotated clockwise as viewed from above, and the loading blocks 50, 50 contact the catchers 55, 55 fixed to the mechanical chassis 2 (third). At the same time, the pinch roller lever 47 reaches the position shown by the dashed line in FIG. 3 and stops rotating.

The portion of the magnetic tape 56 that has been passed through the front surface of the tape pull-out recess 53 is pulled by the loading posts 51, 51, the pinch roller 48, etc. The fixed amount is drawn out, and a part thereof is wound around the outer peripheral surface of the head drum 42 by a predetermined winding angle, and the pinch roller 48 is moved to a position slightly separated from the capstan 46.

This state is the stop mode, in which high-speed running of the tape such as fast-forwarding and rewinding of the tape is performed by rotating the reel base 5 or 5 'in the tape winding direction from this state. That is, in this stop mode, the swing gear 21 is held at the first position, and when the tape is fast-forwarded, the motor 27 is rotated forward at a high speed and the T-side reel base 5 'is rotated.
Is rotated at a high speed in the tape winding direction, so that the magnetic tape 56 is pulled out of the S reel 54 and is returned to the T reel 54 '.
The motor 27 is rotated at a high speed in the direction in which the tape is rewound (hereinafter, referred to as a “forward direction”), and when rewinding the tape, the S-side reel base 5 is rotated.
Is rotated at high speed in the tape winding direction, whereby the magnetic tape 56 is pulled out of the T reel 54 'and
At a high speed in a direction in which it is wound up (hereinafter, referred to as a “reverse direction”).

Further, when a command for forming a play mode for performing recording or reproduction is issued, the mode slider 35 is moved to the play position, whereby the swing gear 21 is raised to the second position, and the loading block is moved. 50, 50 are pressed against the catchers 55, 55, and the pinch roller lever 47
Is further rotated clockwise so that the pinch roller 48 is pressed against the capstan 46 with the magnetic tape 56 interposed therebetween, and the magnetic tape 56 is defined by the rotating capstan 46 and the pinch roller 48 pressed and rotated against the capstan 46. Run at high speed,
The motor 27 is rotated at a low speed, whereby the reel base or 5 'is rotated in the tape winding direction so that the tape reel 54 is rotated.
Or 54 'winds up the magnetic tape 56, and the rotating magnetic heads 42c, 42c scan the recording surface of the magnetic tape 56, thereby recording a signal on the magnetic tape 56 or reproducing a recorded signal. Done.

In this way, when the magnetic tape 56 is run, the rotation of the magnetic tape 56 in the mode is suppressed by a back tension mechanism (not shown) on the reel base on which the tape reel from which the magnetic tape 56 is pulled out is engaged. A force is applied, thereby providing back tension to the magnetic tape 56 that is being drawn from the tape reel.

(B-3. Brake mechanism) [FIGS. 2, 4, 6, and 8] 57 is an S-side brake arm, 58 is a T-side brake arm, and these brake arms 57 and 58 are mainly magnetic. At times other than when the tape 56 is running, the reel bases 5, 5 '
The rotation of the reel bases 5 and 5 'is disabled by being pressed against each other.

One end of each of the brake arms 57 and 58 is supported on the upper surface of the sub-chassis 3 so as to be rotatable substantially in the front-rear direction. , 59 and its spring hook
The rotating force to the reel bases 5 and 5 'is urged by the tensile force of the tension spring 60 stretched between 57a and 58a, and the rotating power is not pressed in the direction against the rotating power. The brake shoes 59, 59 are held in a brake position pressed against the high speed gears 8, 8 of the reel bases 5, 5 '(see FIG. 4), thereby disabling the rotation of the reel bases 5, 5'.

Reference numeral 61 denotes a brake release lever whose substantially central portion is rotatably supported on the sub-chassis 3, one end of which is connected to the piston rod 62a of the electromagnetic plunger 62, and a pin 61a protrudingly provided at the other end. When the electromagnetic plunger 62 is energized and its piston rod 62a is retracted, the brake release lever 61 is clocked when viewed from above. When the T-side brake arm 58 is rotated in the counterclockwise direction by rotating the T-side brake arm 58 in the counterclockwise direction, the pressing formed on the rotation end portion is performed. The portion 58c pushes the pressed portion 57b formed at the rotating end portion of the S-side brake arm 57 forward to rotate the S-side brake arm 57 clockwise, whereby the brake arm 57 and the 58 is the reel base 5, 5 ' The brake is moved to the brake release position separated from the brake (see FIG. 8). The rotation of the reel bases 5, 5 'is performed in this state.

When the excitation of the electromagnetic plunger 62 is released from this state, the brake arms 57 and 58 are returned to the brake position by the tensile force of the tension spring 60.

(G. Effects of the Invention) As is apparent from the above description, the reel stand drive mechanism of the present invention includes a reel engagement shaft, a low-speed gear for low-speed running of the tape, and a low-speed gear for high-speed running of the tape. A high-speed gear, a drive gear rotated by motor driving, and a shaft provided between the two reels and having a position corresponding to the high-speed gear and a position corresponding to the low-speed gear. A swing gear that is movably supported in the direction and is meshed with the drive gear, and the drive gear is rotated and the swing gear is rotated, so that the swing gear and the swing gear are rotated about the rotation axis of the drive gear. An oscillating lever rotatably supported in the rotational direction of the drive gear, a resilient means for urging the oscillating gear toward a position corresponding to the low-speed gear, and moved to a position corresponding to a predetermined mode By at least With the slider forming the top mode and the play mode, and with the movement of the slider from the initial position to the stop mode position, the tape in the tape cassette to be loaded is pulled out, and the tape is moved along the guide formed on the chassis to be pulled out. A pair of loading sections for winding the tape on the head drum, and a rotatably provided on the chassis. The slider is rotated toward the leading end by being rotated as the slider moves from the stop mode position to the play mode position. A movably provided pinch roller includes a pinch roller lever for holding the tape together with the capstan, and a gear pressing portion provided at a position opposed to the swing lever of the slider, with the movement of the slider to the stop mode position. When the tape cassette is loaded by the pair of loading sections, When the rocking lever is pressed by the gear pressing portion, the rocking gear is moved to a position corresponding to the high-speed gear, and further, the rocking lever is rotated according to the rotation direction of the drive gear, and the rocking gear is moved. By selectively meshing with the high-speed gear of each reel base, the tape is moved at high speed in the forward or reverse direction, and the pinch roller lever is rotated with the movement of the slider to the play mode position, and the tape is moved by the pinch roller and the capstan. And the pressing of the gear pressing portion against the swing lever is released, whereby the swing lever is moved to a position corresponding to the low-speed gear together with the swing gear by the urging force of the resilient means,
According to the rotation direction of the drive gear, the swing lever is rotated and the swing gear is selectively engaged with the low-speed gear of each reel base, whereby the tape is driven at a low speed in the forward direction or the reverse direction. I do.

Therefore, according to the reel base driving mechanism of the present invention, the control of the input system of the rotational force to the reel base required according to the difference in the tape running mode can be performed by switching the position of the swing gear in the axial direction. The switching of the position of the oscillating gear can be performed by using a slider for selectively forming various modes. In addition, one drive system can be commonly used for two reel bases. Therefore, the number of members dedicated to the reel base drive mechanism is extremely small, and there is no need to use a brushless motor for the drive source, so that the reel base drive mechanism can be manufactured at low cost without impairing the required functions. Can be configured.

In the above embodiment, the oscillating gear is biased by the resilient means to move to a position corresponding to the low-speed gear. However, in some cases, the oscillating gear may be moved to a position corresponding to the high-speed gear. Alternatively, the movement to the position corresponding to the low-speed gear may be performed by the gear pressing portion of the slider.

Further, in the above-described embodiment, the moving force to one of the two positions is urged to the oscillating gear by urging the oscillating lever supporting the oscillating gear with the moving force. The urging of the moving force may be performed directly on the swing gear.

Further, in the above-described embodiment, the high-speed gear and the low-speed gear have the same diameter, and the swing gear has a single gear structure, and the rotation speed is controlled by the drive system. In some cases, the diameters of the high-speed gear and the low-speed gear are different from each other, and the oscillating gear has a structure having a plurality of large and small gears. By doing so, the gear ratio between the high-speed gear and the low-speed gear and the oscillating gear is adjusted. It is also conceivable to make it possible to switch between.

In the above-described embodiment, the present invention is applied to the reel drive mechanism in the R-DAT. However, the application of the present invention is not limited to this, and the reel drive in various tape traveling devices is applicable. It can be applied as a drive mechanism, and the specific shape or structure, such as the shape of the slider and its gear pressing portion shown in the drawings, is merely an example of the embodiment when implementing the present invention. Of course, the technical scope of the present invention should not be limitedly interpreted by these.

[Brief description of the drawings]

The drawing shows an example in which the reel base driving mechanism of the present invention is applied to a reel base driving mechanism in an R-DAT,
FIG. 1 (A) is an enlarged vertical sectional view of a main part when the tape is running at a high speed, FIG. 1 (B) is an enlarged vertical sectional view of a main part when the tape is running at a low speed, and FIG.
FIG. 3 is an enlarged perspective view showing the entire DAT, FIG. 3 is a plan view showing the entire R-DAT in the play mode, FIG. 4 is an enlarged plan view showing a portion below the mechanical chassis, and FIG. FIG. 6 is a perspective view of a main portion showing a portion below the mechanical chassis, FIG. 7 is a perspective view of a mode slider, and FIG. It is a top view which shows a principal part. DESCRIPTION OF SYMBOLS 2... Chassis 4... Reel base drive mechanism 5... Reel base 5 ′... Reel base 8... High-speed gear 9 9 high-speed gear 11. …… Swing lever, 21 ……
Swing gear, 25 ... Rotary shaft, 27 ... Motor, 30 ... Drive gear, 33 ... Spring means, 35 ... Slider, 41 ... Gear pressing part, 42 ... Head drum, 43 ... Guide , 43 '... guide, 45 ... tape cassette, 46 ... capstan, 47 ...
… Pinch roller lever, 48… Pinch roller, 56… Tape

Continuation of the front page (72) Inventor Yutaka Fukuyama 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-62-250538 (JP, A) Jpn. (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 15/44

Claims (1)

(57) [Claims] 1. A reel base having a reel engaging shaft, a low-speed gear for low-speed running of a tape, and a high-speed gear for high-speed running of a tape, and a driving gear rotated by a motor. Provided between the two reel bases, supported movably in the axial direction between a position corresponding to the high-speed gear and a position corresponding to the low-speed gear, and meshed with the drive gear. An oscillating gear, and the driving gear is rotated and the oscillating gear is rotated, so that the oscillating gear and the oscillating gear are rotatably supported in the rotation direction of the driving gear together with the oscillating gear as an axis. Swinging lever, a resilient means for urging the swinging gear toward a position corresponding to the low-speed gear, and being moved to a position corresponding to a predetermined mode,
A slider that forms at least a stop mode and a play mode, and with the movement of the slider from the initial position to the stop mode position, pulls out the tape in the tape cassette to be loaded and moves along a guide formed on the chassis. A pair of loading portions for winding the pulled-out tape around a head drum; and a rotatably provided on the chassis, wherein the slider is rotated with the movement of the slider from the stop mode position to the play mode position. Accordingly, a pinch roller rotatably provided on the distal end side includes a pinch roller lever for holding the tape together with the capstan, and a gear pressing portion provided at a position facing the swing lever of the slider, As the slider moves to the stop mode position, the pair When the tape cassette is loaded by the loading portion and the swing lever is pressed by the gear pressing portion, the swing gear is moved to a position corresponding to the high-speed gear, and the rotation of the drive gear is further increased. According to the direction, the swing lever rotates and the swing gear selectively meshes with the high-speed gear of each reel base, whereby the tape runs at high speed in the forward direction or the reverse direction, and As you move to the play mode position,
The pinch roller lever is rotated to pinch the tape between the pinch roller and the capstan, and the pressing of the gear pressing portion on the rocking lever is released so that the rocking lever is biased by the urging means. Is moved to a position corresponding to the low-speed gear together with the oscillating gear, and further, the oscillating lever is rotated in accordance with the rotation direction of the drive gear, and the oscillating gear is connected to the low-speed gear of each reel base. A reel base driving mechanism, wherein the tape is driven at a low speed in a forward direction or a reverse direction by selective engagement.