JPH03230356A - Mode switching device for tape player - Google Patents

Abstract

PURPOSE:To control the position of an idler rotor by the same switching rotor synchronously with the movement of a head base by controlling the position of an idler switching body by the cam of the switching rotor in accordance with each mode and holding the idler switching body on a proper position for each mode. CONSTITUTION:When the switching rotor is driven by a motor, the head base 30 is moved to set up a play mode or a stop mode. At that time, a mode switching body 36 on the head base 30 is driven by the switching rotor. The moving force of the switching body 36 is transmitted to the idler switching body through an elastic member and the idler switching body is driven to either one of directions. Thereby, the idler rotor 14 is driven in either one of flywheel-reel board directions and power is switched to the reel board. In this case, the position of the idler switching body is controlled by the cam 53 of the switching rotor in each mode and the power transmission state of the idler rotor is also controlled. Control force is absorbed by the deformation of an elastic member. Consequently, the idler switching body is held on a position appropriate for the set mode by controlling the cam 53 and the position of the idler rotor 14 is controlled by the same switching rotor synchronously with the movement of the head base 30.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape drive section of a tape player, and particularly to a tape drive unit for a tape player, and in particular, a common switching drive source that enables movement of the head base and selective switching operation of power to the reel stand. The present invention relates to a mode switching device that can switch modes in a timely manner.

[Prior Art] In a tape player, the power transmitted to the reel stand is switched for each mode such as FF (fast forward) or RE'W (rewind). For example, in the FF mode, the reel stand on the winding side is It is necessary to drive clockwise and drive the supply side reel stand clockwise in REW mode.6 Conventionally, a motor for driving the cabstan was used, or a motor separate from the motor for driving the capstan was used. The rotation of the pair of reel stands is switched by using a dedicated motor for driving the reel stands and driving this motor in both forward and reverse directions.

[Problems to be Solved by the Invention] However, in the above-mentioned method of driving the reel stands by rotating the motor in both forward and reverse directions, a motor that can drive in both forward and reverse directions must be used (instead of using a motor that can drive in both forward and reverse directions). Not only is the motor itself expensive, but the motor control circuit is also complicated.

Therefore, a structure in which only one forward rotation motor is used is also considered. For example, one motor drives a pair of capstans and a flywheel integrated with each other in opposite directions, and the rotation of one flywheel is transmitted to one reel stand via an idler rotating body, and the position of the idler rotating body is also controlled. The rotation of the other flywheel is transmitted to the other reel stand via the idler rotating body.

In this case, it is necessary to optimally set the movement timing of the head base to each mode position and the distribution of the idler rotating body to the reel stand, such as the temporal timing of the operation and the movement stroke. Therefore, in order to use the above power transmission path, the drive mechanism that moves the head base to each mode position and the side of the retraction switching machine that moves the idler rotating body toward either reel stand must be completely separate. Therefore, it is necessary to use separate drive sources to apply switching force to each mechanism. Therefore, by using only a motor that rotates in one direction, it is predicted that the switching mechanism will become more complicated.

The present invention solves the above-mentioned conventional problems, and makes it possible to move the head base to each mode position and switch the idler rotor by using the rotational power of the same switching rotor. It is an object of the present invention to provide a mode switching device for a tape player that can move a head base and switch power transmission to a reel stand in a timely manner.

[Means for Solving the Problems] A mode switching device for a tape player according to the present invention includes a pair of flywheels driven in opposite directions by a motor, a pair of reel stands on which tape reels are loaded, and the pair of reels. An idler rotating body that moves between the stands and transmits the rotation of either of the flywheels to any of the reel stands, a switching rotating body that is driven by the power of the motor, and a switching rotating body that moves the switching rotating body to each mode position. A locking mechanism that stops the switching rotor, a drive unit that operates the locking mechanism, a head base that stops at each mode position according to each rotational stop position when the switching rotary body is locked, and a head base that stops at each mode position. a mounted magnetic head; a mode switching body movably supported by the head base and moved in either direction by the switching rotary body at a predetermined timing of rotation of the switching rotary body; an idler switching body to which a switching force is transmitted via an elastic member and moves the idler rotating body in the direction of either the flywheel or the reel stand according to the direction of movement; A cam portion for controlling the position of the idler switching body is provided.

[Operation] In the above means, the head base is moved by the switching rotary body driven by the motor to set play mode, stop mode, etc. At this time, the switching rotary body drives the mode switching body on the head base. be done. The moving force of the mode switching body is transmitted to the idler switching body via the elastic member, and the idler switching body is driven in either direction. As a result, the idler rotating body is driven in the direction of one flywheel and reel stand or in the direction of the other flywheel and reel stand, and power is switched to the reel stand. At this time, in each mode, the position of the idler switching body is controlled by the cam of the switching rotary body, and therefore the state of power transmission by the idler rotary body is also controlled. This control force is absorbed by the deformation of the elastic member.

By controlling this cam, the idler switching body is held at a position suitable for each mode, and the switching rotary body can control the position of the idler rotating body in synchronization with the movement of the head base.

[Example] The present invention will be described in detail below based on the drawings.

Figures 1 to 8 show the structure of the mode switching device for a tape player according to the present invention, and Figures 9A and below show the operation in each mode.

The drawing shows a tape drive unit of an auto-reversing tape player.

In FIG. 1, reference numeral 11a represents a take-up reel stand during forward travel, and llb represents a take-up reel base during reverse travel. 13a and 13b are capstans. A flywheel 12a and a gear 12C are integrally provided at the base of the capstan 13a on the right side of the figure, and a flywheel 12b and a gear 12d are integrally provided at the base of the capstan 13b on the left side of the figure. The chassis 16 on which these members are supported is provided with a motor that rotates in only one direction, and this motor drives the right flywheel 12a counterclockwise, and the left flywheel 12. b is driven clockwise.

Further, a drive gear 12e is integrally formed with the flywheel 12a and gear 12c at the base of the capstan 13a on the right side of the figure.

Reference numeral 14 denotes a rotation transmission member that transmits the rotational force of the gear 12c or 12d integrated with the flywheel to the reel stand 11a or llb.

Reference numeral 15 denotes a swing arm that rotatably supports the rotation transmission member 14 and swings the rotation transmission member 14 in the -B direction of the arrow in FIG.

As shown in FIGS. 5 to 6 (both vertical cross-sectional views), the center hole of the rotation transmission member 14 is connected to the shaft portion 15 of the swing arm 15.
It is rotatably inserted with respect to a. Further, as shown in FIG. 5, the fulcrum shaft 1.5b of the swing arm 15 is inserted into a hole in the protrusion 16a of the chassis 16, and is swingably supported by the protrusion 16a. Therefore, the swing arm 15
The shaft portion 15a is rotated in the direction of arrow E in FIG.
The rotation transmitting member 14 supported by the shaft portion 15a is also swingable in the direction A-B of the arrow in the figure. Further, as shown in FIG. 1, a pair of left and right pins 15c and 15d are provided protruding from the bottom of the swing arm 15.

The pin 15c or 15d is guided in the left-right direction in the figure by a mechanism to be described later, thereby swinging the swinging arm 15 in the A direction or the B direction. Along with this, the rotation transmission member 14 that transmits the rotational force of the flywheel 12a or 12b also rotates in one of the above directions.

Due to this swinging motion, the rotational force of the gear 12c or 12d is not transmitted to either of the reel stands 118, 11b in the stop mode (the state shown in FIG. 1). is transmitted via the rotation transmission member 14 to the reel stand 1a for forward running; and the rotational force of the left gear 12d is transmitted to the reel stand 11b for reverse running via the rotation transmission member 14. can be switched to either state.

As shown in FIGS. 4A and 4B (perspective views from the ■ arrow in FIGS. 1 and 12) and FIG. 5, the rotation transmitting member 1
4 includes a main body gear 18 that meshes with a gear 12c or 12d integrated with the capstan 13a or 13b, a first driven rotating gear 20 that is overlapped with this main body gear 18 via a felt friction member 19, and the main body From the gear 18, the second
and a driven rotating gear 22 are provided to be rotatable independently of each other. As shown in FIG. 6, the pitch radius of the teeth 22a of the second driven rotating gear 22 is smaller than the pitch radius of the teeth 20a of the first driven rotating gear 20, and
Its position in the height direction (axial direction of the reel stand) is formed above the teeth 20a of the first driven rotary gear 20.

Further, the radii of the contact positions of the felt friction members 19 and 21 are formed to have mutually different dimensions R3 and R2 (R,>R, respectively), as shown in FIG.

Further, a spring SP is interposed between the upper part of the second driven rotary gear 22 and the first driven rotary gear 20, and this spring SP causes the main body gear 18 and the first driven rotary gear 2 to
A predetermined spring load is applied to the friction member 19 between the main body gear 18 and the second driven rotating gear 22, respectively. Due to the action of the spring SP and the friction member 19.21, the first driven rotary gear 20 and the second driven rotary gear 22 are
The main body gear 18, which rotates under the power of the flywheels 12a and 12b, applies rotational torque that causes different frictions through the respective friction members 19, 21. In this embodiment, for example, the rotation torque T1 applied to the first driven rotation gear 20 is set to a value of about 100 cm-g, which is suitable for high-speed tape running such as in FF-REW mode or cue/review mode, and The rotational torque T2 given to the driven rotating gear 22 is 40 to 5, which is suitable for low-speed running in play mode (recording or playback).
The value is set to about 0 cm-g.

As shown in FIG. 5, the swing arm 15 is connected to the chassis 16
The protruding piece 16a is biased downward in the figure by a spring 17 interposed between the protruding piece 16a and the protruding piece 16a. When the tape runs at low speed in the play mode, the swing arm 15 is moved downward in the figure by the spring 17. Furthermore, when the tape is running at high speed in FF-REW, cue, review mode, etc., the entire swing arm 15 (and the rotation transmission member 14) is pushed upward in FIG. 5 against the spring 17 by a mechanism to be described later. It looks like this. Therefore, the rotation transmission member 14 is
The height position in the vertical direction (in the axial direction of the reel stand) can be switched between when the tape is running at low speed and when it is running at high speed.

In addition, in this embodiment, FIGS. 4A to 4B and 7th section to
As shown in FIG. 8, large-diameter gears 23a, 23b and small-diameter gears 24a, 24b located below are formed at the bases of the reel stands 11a and llb (portions that receive power from the flywheels 12a, 12b). has been done. As shown in FIGS. 4B and 7, when the tape runs at low speed, the swing arm 15 and the rotation transmission member 1
4 is urged downward by the spring 17 in FIG.
a and the large-diameter gear 23a or 23b of the reel stand 11a or 11b mesh with each other. Furthermore, when the tape runs at high speed, the swinging arm 15 is pushed up as described above, and the swinging arm 15 and the rotation transmission member 14 rise against the biasing force of the spring 17.
As shown in FIG. 8, the teeth 20a of the first driven rotary gear 20 of the rotation transmission member 14 mesh with the small diameter gear 24a or 24b of the reel stand 11a or llb.

The upper and lower surfaces of the chassis 16 shown in the first section ↓:=
, for switching the rotation transmission member 14;
T! A switching mechanism is provided for setting the mode. FIG. 2 is a perspective view showing each mechanism with the chassis 16 omitted.

In FIG. 2, reference numeral 30 indicates a head base. 1st
As shown in the figure, this head base 30 is attached to the chassis 16.
It is supported slidably in the C-D direction on the upper surface. This head base 30 is provided with a head support stand 31, and a rotary magnetic head 32 is supported on this head support stand 31. This rotary magnetic head 32 has a forward running mode and a reverse running mode, and its orientation with respect to the tape running direction can be switched by 180°.

A small gear 33 is connected to the rotary magnetic head 32 . A fan-shaped switching gear 34 is rotatably supported on the head support base 31, and its teeth mesh with the small gear 33. The switching gear 34 also has an arm 3 extending downward.
4a are integrally formed. By driving this arm 34a left and right to rotate the switching gear 34, the small gear 33 and the magnetic head 32 are rotated. The small gear 33 and the magnetic head 32 are biased by a spring so that their posture is maintained in a 180° rotated state.

A restraining groove 30a is formed in the head base 30. A bottle 15e protruding from the upper surface of the swing arm 15
is inserted into this restraint groove 30a. When the head base 3o is moving in the D direction, the bin 15e intervenes in the narrow portion of the restraint groove 30a, and the swing arm 15 is maintained at the neutral position. Further, when the head base 30 moves in the C direction, the bin 15e intervenes in the wide part of the restraint groove 30a, and the swing arm 15 becomes in a state where it can freely rotate. Further, the head base 30 is formed with a bent piece 30b. The head base 30 is always urged in the direction D by a spring (not shown), and the bending piece 30 is pressed by a cam 53 (described later).
By pressing b, the head base 30 is sent in the C direction.

A roller switching lever 35 is supported on the upper surface of the head base 30 and behind the head support stand 31 so as to be slidable in the E-F direction. Also, on the lower surface of the head base 30 and at C-
A mode switching lever 36 is supported at a substantially intermediate position in the D direction so as to be slidable in the same <EF direction. Further, both the roller switching lever 35 and the mode switching lever 36 are biased in the E direction by springs.

The roller switching lever 35 is set to E by inserting its bent piece 35a into a groove (not shown) in the head base 30.
It is designed to be able to slide in the -F direction. The left and right ends of the roller switching lever 35 in the drawing are bent downward, and spring holding grooves 35b and 35c are formed in the bent portions.

Further, the portion directed below the bent piece on the right side in the figure is a sliding protrusion 35d.

FIG. 9A is a partial plan view showing a state in which the head base 30 and the roller switching lever 35 are installed on the chassis 16. Each capstan 13a is mounted on the chassis 16.
, 13b, the pinch roller P1. P2 is arranged. The right pinch roller P is held by a holder 37a, and the left pinch roller P2 is held by a holder 37b. Further, the right holder 37a is rotatably supported by a shaft 38a provided on the chassis 16, and the left holder 37b is rotatably held by a shaft 38b.

Wire springs 39a and 39b are attached to each holder 37a and 37b. The wire springs 39a, 39b are substantially integrated with the holders 37a, 37b. wire spring 39b
The tip is bent at a predetermined angle. The tips of the wire springs 39a and 39b are held in the spring holding grooves 35b and 35c of the roller switching lever 35. In FIG. 9A, the roller switching lever 35 is moving in the E direction. At this time, the right spring holding groove 35b holds the bent end of the wire spring 39a. On the other hand, the spring holding groove 35c on the left side holds the unbent portion (base) of the wire spring 39b. Therefore, in this state, the roller switching lever 3 together with the head base 30
5 moves forward in the C direction, the left holder 37b is rotated counterclockwise by a large amount, but the right holder 37a is rotated clockwise by a small angle! be moved. Therefore, the left pinch roller P.

Only the roller switching lever 35 is brought into pressure contact with the capstan 13b (reverse running mode), and in FIG.
is moving in the F direction. Therefore, at this time, the unbent portion of the right wire spring 39a is held in the spring holding groove 35b,
The bent end of the left wire spring 39b is held in the spring holding groove 35c. When the head base 30 moves forward in the C direction in this state, the right holder 37a thickens (rotates and the right pinch roller P comes into pressure contact with the capstan 13a (forward running mode)).

As shown in FIGS. 1, 9A, and 9B, the chassis 1
A pair of guide grooves G and G2 are cut out in the lower right part of 6 in the drawing. As shown in FIG. 9A, when the roller switching lever 35 is moved in the E direction, the head base 30 is
When the roller switching lever 35 moves forward a little in the E direction, the sliding protrusion 35d on the right side of the roller switching lever 35 enters into the guide groove G, and the state in which it moves in the E direction is maintained. Also, as shown in Figure 9B,
The roller switching lever 35 moves in the F direction and the Radbase 30 moves in the C direction 4)1. When moving forward, the sliding protrusion 35d enters the guide fully G2 and is maintained in the state of movement in the F direction.

Next, as shown in FIG. 2, a pair of projections 36a and 36b are provided on the upper surface of the mode switching lever 36, and the projections 36a and 36b are connected to the grooves 30c and 36b of the head base 30.
0d, so that the mode switching lever 36 can move in the E-F direction. This mode switching lever 3
A spring hole 36c is bored at the left end of the torsion spring 6 in the drawing, and one arm of the torsion spring 41 is hung in this spring hole 36c. Further, an arm is provided on the right side of the mode switching lever 36 in the drawing, and a pressed bottle 36d is provided to protrude downward from this arm.

Next, the members arranged on the lower surface of the chassis 16 in FIG. 2 will be explained.

First, the main switching lever 45 is located on the bottom surface of the chassis 16.
- It is supported slidably in the F direction, and is constantly urged in the E direction by springs.

This main switching lever 45 is connected to the roller switching lever 35.
It is also used to drive the mode switching lever 36 in the E or F direction. A pressing pin 45a is provided on the upper surface of the main switching lever 45. This pressing bottle 45a is a sliding protrusion 35d on the right side of the roller switching lever 35.
is facing the position where you can push in the F direction (9th
(See Figure A, Figure 9B). Further, the main switching lever 45 has a pressing protrusion 45b extending forward. This pressing protrusion 45
b has an opposing arm 4 at a position where it can press the pressed bin 36d of the mode switching lever 36 in the direction F (see Figure 1O).
5c extends, and a pin 45d is provided protruding from the lower surface thereof. This pin 45d is inserted into a cam groove formed on the upper surface of a switching gear 50, which will be described later. That is, the main switching lever 45 is driven in the E-F direction according to the shape of the cam groove on the upper surface of the switching gear 50. Also, on the right side of the main switching lever 45 as shown in the figure is a pressed projection 45.
e is provided. This pressed projection 45e is pushed in the F direction by the power of a solenoid S, which will be described later.

Further, the main switching lever 45 is connected to the magnetic head 32.
It has the function of changing the direction of the As shown in the second step, the center of the main switching lever 45 has a head switching groove 45f.
is formed. Further, in front of this head switching groove 45f, a relief groove 45g wider than this groove is formed. The arm 34a of the switching gear 34 supported by the head support stand 31 on the head base 30 is located within the head switching groove 45f or the relief groove 45g according to the movement of the head base 30.

Further, below the switching gear 50 is an idler switching lever 46.
is provided. This idler switching lever 46 is located under the switching gear 50 in the sub-chassis (without sliding).
It is supported slidably in the E-F direction. In the arm on the left end of this idler switching lever 46 in the illustration: a spring hole 46
A is bored, and the arm of the torsion spring 41 serves as a hanger. That is, the mode switching lever 3
6 and idler switching lever 46 are torsion springs 4
connected by 1. As a result, as shown in FIG. 10, when the mode switching lever 36 moves to Ey5rEil, the idler switching lever 46 is moved in the F direction due to the elasticity of the torsion spring 41. Further, when the mode switching lever 36 moves in the F direction, the idler switching lever 46 is moved in the E direction due to the elasticity of the torsion spring 41.

This idler switching lever 46 rotates the swing arm 15. In other words, the idler switching lever 4
6 is provided with a pair of guide protrusions 46b and 46c, and as shown in FIG.
The pins 15c and 15d of the swing arm 15 are sandwiched between the two pins 15c and 15d. The idler switching lever 46 is set to E.
When the swing arm 1 moves in the direction shown in FIG.
5 is swung in the B direction (reverse running mode) and the idler switching lever 46 is moved in the F direction, the swing arm 15 is swung in the A direction (forward running mode) as shown in FIG.

Further, the idler switching lever 46 is provided with a bent piece 46d. This bent piece 46d is inserted into a cam groove formed on the lower surface of the switching gear 50. This cam groove is formed so that the idler switching lever 46 can be held at an intermediate position in the E-F direction depending on the rotational position of the switching gear 50. At this time, the idler switching lever 46 is in the neutral position, and the swing arm 15 is also in the A-
It is held at a neutral position in the B direction.

As shown in FIG. 2, a trigger lever 47 is provided below the switching gear 50. The trigger lever 47 has its support shaft 47a rotatably supported on the back surface of the chassis 16. Further, the trigger lever 47 is urged clockwise 21 by a spring. Solenoid S is energized,
When the plunger 48 is attracted, the trigger lever 47 is driven counterclockwise against the biasing force of the spring. A lock pin 4 is attached to one arm of the tonneau lever 47.
．． 7b is provided. This mouth...J pin 47b faces the lower surface of the switching gear 50, and this lock pin 4
7b locks the switching gear 50 at a predetermined rotational position. Further, a pressing pin 47c is provided on the other arm, and this pressing pin 47c faces a position where the pressed projection 45e of the main switching lever 45 can be pressed in the F direction.

Next, FIG. 3A is a plan view of the switching gear 50, FIG. 3B is a side view thereof, and FIG. 3C is a bottom view thereof.

As shown in FIG. 3A, teeth 50a are formed on the outer periphery of the switching gear 50 to mesh with the drive gear 12e (see FIG. 1) located at the base of the capstan 13a. This tooth 50a
There are three missing parts X1. X2. X3 is formed, and the power of the drive gear 12e is not transmitted to the switching gear 50 when any one of the cutout portions X+, X2, and X3 faces the drive gear 12e. As shown in section 3C, a guide step 51 along the circumference is provided on the back side of the switching gear 50.
is formed, and three triangular stoppers 52a, 52b, 5 are formed from this guide step 51 toward the center.
2c is provided protrudingly. These stoppers 52a, 52b,
The lock pin 47b of the trigger lever 47 faces the position through which the trigger lever 52c passes. The switching gear 50 is driven clockwise (in the direction of the arrow in FIGS. 3A and 3B) by the drive gear 12e, but during this rotation, one of the stoppers 52a, 52b and 52c hits the lock pin 47b. When this happens, the switching gear 50 is locked. When locked by the stopper 52a, the missing portion x1 faces the drive gear 12e (stop mode).

When locked by the stopper 52b, the defective part
2 faces the drive gear 12e (play mode). When locked by the stopper 52c, the missing portion x3 faces the drive gear 12e (FF-REW-
cue review mode).

As shown in FIG. 3A, a cam 53 for driving the head base is integrally protruded from the center of the upper surface of the switching gear 50. As shown in FIG. Bent piece 30b formed on the head base 30
(see second section) is opposed to the outer circumferential surface of this cam 53. The head base 30 is fixed to D by a spring (not shown).
biased in the direction. Then, the switching gear 50 rotates,
When the head base driving cam 53 pushes the bending piece 30b, the head base 30 is pushed out in the C direction.

When the corner 53a of the cam 53 is in contact with the bending piece 30b, the head base 30 moves the most in the direction C, and the play mode is set (see FIG. 11).

Further, when the corner 53b of the cam 53 is in contact with the bending piece 30b, the head base 30 is in a position slightly returned to the D direction than in the play mode, and the head base 30 is in a position that is slightly returned in the D direction than in the play mode, and the is set (14th
(see figure).

Further, as shown in FIG. 3A, a guide groove 54 is formed on the upper surface of the switching gear 50. The pin 45d of the main switching lever 45 is inserted into the guide groove 54 (see FIG. 2). In this guide groove 54, a first branch protrusion 54a and a second branch protrusion 54b are provided. The movement path of the bin 45d, which moves relatively within the guide groove 54 by the rotation of the switching gear 50, is separated by the first branch protrusion 54a or the second branch protrusion 54b.

As shown in FIG. 3A, a step 55 is formed on the outer periphery of the upper surface of the switching gear 50, and a raised portion 55a is provided in a portion of the step 55. As shown in FIG.

As shown in FIG. 2, the rear end portion 15f of the swing arm 15 is opposed to the outer peripheral position of the step 55. Switching gear 5
When the protruding portion 55a moves to the position of the swing arm 15 with the rotation of the rotor 1, the rear end portion 15f of the swing arm 15 is lifted by the protrusion 55a. As a result, the swing arm 15 rises against the elastic force of the spring 17,
The rotation transmitting member 14 is switched to the engaged state shown in FIG.

Furthermore, as shown in FIG. 3C, a guide groove 56 is formed on the lower surface of the switching gear 50. As shown in FIG. 2, a bent piece 46d of the idler switching lever 46 is inserted into the guide groove 56. Due to the change in the force point of the torsion spring 41 shown in FIG. 2, the idler switching lever 46 is biased in the E direction or the F direction.
slides on the inner peripheral surface 57 of. Also, the idler switching lever 46
When the bending piece 46d is biased in the E direction, the bent piece 46d slides on the outer circumferential surface 58 of the guide groove 56. Convex portions 57a, 57b and concave portions 57c, 57ci are formed on the inner circumferential surface 57. Further, on the outer circumferential surface 58, convex portions 58a and 58b are provided.
and recesses 58c and 58d are provided.

Next, the operation of this embodiment will be explained.

Stop Mode FIG. 1 shows the stop mode. In the stop mode, first, the solenoid S shown in Fig. 2 is de-energized,
The trigger lever 47 is rotated clockwise by the force of a spring. The lock bin 47b of the trigger lever 47 is connected to the stopper 52 on the back side of the switching gear 50.
At point a, the switching gear 50 is locked. At this time, the missing portion X of the switching gear 50 is inside the drive gear 12e. Further, the head base driving cam 53 provided on the top surface of the switching gear 50 is in a rotational position with its corner 53a facing downward in the figure, and the head base 30
is returned in the direction D by the force of the spring. Therefore, the magnetic head 32 on the head base 30 is connected to the cassette 1 (
In Fig. 5 (Sansho), it is away from the staple. Further, the roller switching lever 35 provided on the upper surface of the head base 30 has also been returned to the D direction together with the head base 30.

Therefore, the spring holding grooves 35b and 35c provided on both sides of the roller switching lever 35 pull the wire springs 39a and 39b shown in the 9th AIE in the D direction 1-, and attach them to the respective holders 37a and 37b. : Tightened pinch roller P
1 and P2 are separated from capstans 13a and 13b. Also, ``bending piece 46d of the drive switching lever 46''
ia) inside the guide groove 56 on the back side of the switching gear "50"
It is held in the 3rd C Ward of the Department of Management, indicated by . At this time, due to the narrow width part fa), the idler switching lever 46 is
- It is held at an intermediate position in the F direction.

This holding state is allowed by the deflection of the torsion spring 41. Therefore, in the stop mode, as shown in FIG.
Bins 15c, 15 of the swinging arm 15 by 6b, 46c
d is held, and the swing arm 15 is held in a symmetrical position (neutral position). Furthermore, the bin 15e of the swing arm 15 is held at a neutral position in the AB direction by a restraining groove 30a formed in the head base 30. As a result, the rotation transmission member 14 supported by the swing arm 15 is connected to either reel stand 11a.

11b, and is held at an intermediate position where it does not mesh with either of the two gears 12c12d. In addition, regarding the vertical position of the rotation transmission member 14 (in the axial direction of the reel stand) in this case, as shown in FIG. It is now in a lowered state.

When the power of the unit is turned on to the play mode, or when the play mode of forward running or reverse running is set, the motor drives the flywheel 12a on the right in FIG. 1 counterclockwise, and the flywheel 12b on the left is driven clockwise. When the play mode is set, the solenoid S is energized by a control circuit (not shown). When the plunger 48 of the solenoid S is pulled, the trigger lever 47 rotates counterclockwise, and the lock bin 4
7b is separated from the stopper 52a on the back side of the switching gear 50,
The switching gear 50 is unlocked. At this time, the switching gear 50 is rotated clockwise via the cam 53 by the return force of the head base 30 in the D direction urged by the spring. Therefore, the missing portion x1 of the switching gear 50 comes off from the drive gear 12e, and the drive gear 12e becomes the switching gear 50.
The switching gear 50 is driven clockwise by the driving gear 12e (always rotating counterclockwise together with the flywheel 12a). Thereafter, the solenoid S is de-energized, and the switching gear 50 is switched to the drive gear 12e.
is driven by the next stopper 52b (see Fig. 3c).
hits the lock pin 47b of the trigger lever 47,
The switching gear 50 is locked again, and the missing portion x2 of the switching gear 50 faces the drive gear 12e (the state shown in FIG. 11).

While the switching gear 5o rotates to this position, the switching gear 50
The cam 53 for driving the head base, which is provided in the C
pushed in the direction. When the switching gear 50 is locked again at the angle shown in FIG.
is in a state of pressing the bent piece 30b of the head base 30, and the head base 30 moves forward greatly in the direction C.
The magnetic head 32 contacts the magnetic tape and a play mode is set.

However, while the switching gear 50 rotates to the angle shown in FIG. 11, the following pinch roller selection switching and head switching operations and reel stand 11a are performed.

A switching operation of power transmission to 11b is performed.

First, the pinch roller selection and head switching operations are performed at the beginning of rotation of the switching gear 50. When the solenoid S is energized, the lock pin 47b is removed from the stopper 52a, but at the same time, when the trigger lever 47 is rotated counterclockwise due to the energization of the solenoid S, the main The pressed projection 45e of the switching lever 45 is pressed,
The main switching lever 45 is driven in the F direction. On the other hand, the pin 45d provided on the main switching lever 45 is placed in the guide groove 54 on the top surface of the switching gear 50, but if the excitation time for unlocking the solenoid S is short, the main switching gear 45 is once driven in the F direction, and then returned to the E direction by the force of the spring when the solenoid S is de-energized. Therefore, depending on the rotation of the switching gear 50, the bin 45d moves from the first branch protrusion 248 (b) shown in FIG. 3A.
Pass through i examples. In addition, when the excitation time of the solenoid S is long, the main switching lever 45 is pressed in the F direction for a long time, so as the switching gear 50 rotates, the bin 45d
is guided to the fcl side of the first branch protrusion 54a. That is, if the excitation time of the solenoid S to release the lock from the stop mode is short, the main switching lever 45
is in the state of moving in the E direction, and if the excitation time of the solenoid S is long, it is driven in the F direction for the time it takes for the first branch protrusion 54a to pass.

As shown in FIG. 9A, when the main switching lever 45 is moving in the E direction, the pressing pin 45a does not push the sliding protrusion 35d of the roller switching lever 35 provided on the head base 30 in the F direction. Therefore, roller switching lever 3
5 remains moved in the E direction due to the force of the spring. Further, when the main switching lever 45 moves in the F direction, the pressing pin 45a pushes the sliding protrusion 35d of the roller switching lever 35, and the roller switching lever 35 is driven in the F direction. When the switching gear 50 begins to rotate, the head base 30 begins to be driven in the C direction by the cam 53 provided on the top surface, but at this time, when the roller switching lever 35 provided on the head base 30 is in the E direction, 9th
As shown in Figure A, the sliding protrusion 3.5d on the right side enters the guide groove G on the left side of the chassis 16. Furthermore, when the roller switching lever 35 is in the F direction, the head base 3
0 moves forward in the C direction, the sliding protrusion 35d enters the guide groove 62 on the right side. That is, depending on which (D) of the first branch protrusion 54a in FIG. 3A the bin 45d of the main switching lever 45 provided on the chassis 16 is guided to, the roller switching lever 3 is guided via the main switching lever 45.
5 is driven in the E direction or the F direction for a short period of time. At that time, the head base 30 moves forward in the C direction, so that the roller switching lever 35 is held in the guide groove G1 or G2 of the chassis 16, and the roller switching lever 35 is held in the guide groove G1 or G2 of the chassis 16. Even after the branch protrusion 54a has passed, the roller switching lever 35 is held in the E or F direction and moves forward together with the head base 30.

Here, as shown in FIG. 9A, when the roller switching lever 35 moves in the E direction and is held in the guide groove 61, the spring holding groove 35b on the right side of the roller switching lever 35 is located at the bent portion of the wire spring 39a. The left spring holding portion 35c holds the unbent portion of the wire spring 39b. In this state, when the head base 30 moves forward in the C direction and the roller switching lever 35 moves forward in the C direction at the same time, the wire spring 3
The left holder 37b is largely rotated via the lever 9b, and the pinch roller P2 comes into contact with the capstan 13b to enter the play mode of reverse running. Further, as shown in FIG. 9B, when the roller switching lever 35 moves in the F direction and is held in the guide groove 62, the right spring holding groove 35
b holds the non-bent portion of the wire spring 39a, and the spring holding groove 35c on the left side holds the tip of the bent portion of the wire spring 39b.

Therefore, if the head base 30 continues to move forward in the C direction, the right holder 37a will rotate significantly, the pinch roller P1 will come into contact with the capstan 13a, and the forward running play mode will be set.

Further, as described above, when the main switching lever 45 moves in the E direction or the F direction by the first branch protrusion 54a formed on the top surface of the switching gear 50, the head switching groove formed in the main switching lever 45 is moved. 45f drives the arm 34a of the head switching switching gear 34 shown in FIG. 2 in the E direction or the F direction. Switching gear 3 at this time
4, the small gear 33 is driven, the magnetic head 32 is rotated 180 degrees, and the tape is switched to a direction corresponding to forward running of the tape or a direction corresponding to reverse running of the tape.

Next, the power is switched after the pinch roller selection and head switching operations described above are performed, and then the switching gear 50 is further rotated until the play mode is set. The switching gear 50 rotates, and the main switching lever 4
After the first branch protrusion 54a passes through the position of the bottle 45d shown in FIG. 3A, the second branch protrusion 54b
Pass through position d. At this time, if the solenoid S is left in the non-energized state, the main switching lever 45 remains moved in the E direction, and the bin 45d passes through the path indicated by fdl in FIG. 3A. When the solenoid S is energized, the trigger lever 47 presses the pin 4.
When the main switching lever 45 is moved in the direction F by the lever 7c, the bin 45d is guided to the path indicated by tel in FIG. 3A.

That is, when the pinch roller selection switching and head switching operations are completed and the switching gear 50 is rotating, the main switching lever 45 is selected in the E direction or the F direction by the second branch protrusion 54b. However, at this time, the roller switching lever 35 provided on the head base 30 moves forward, and its sliding protrusion 35d is separated from the pressing pin 45a of the main switching lever 45. Further, the arm 34a of the switching gear 34 for head switching has moved forward into the clearance groove 45g of the main switching lever 45. When the main switching lever 45 is selected in the E direction or the F direction by the second branch protrusion 54b, the pressed pin 36d of the mode switching lever 36 provided on the head base 30 switches the main switching lever as shown in FIG. It faces the position pressed by the pressing protrusion 45b of the bar 45. When the main switching lever 45 is moving in the E direction along the path dl shown in FIG. 3A, the mode switching lever 36 is returned to the E direction by the spring, and the main switching lever 45 When pressed in the F direction, the pressing protrusion 45b presses the mode switching lever 36 in the F direction via the pressed pin 36d.

As shown in FIG. 10, when the mode switching lever 36 is in the E direction, the torsion spring 41 maintains the mode switching lever 36 in the E direction and pushes the idler switching lever 46 in the F direction to maintain that state. maintain.

Conversely, when the mode switching lever 36 moves in the F direction, the force point of the torsion spring 41 changes, the mode switching lever 36 is maintained in the F direction, and the idler switching lever 46 is biased and maintained in the E direction. That is, after the bin 45d passes the second branch protrusion 54b due to the action of the torsion spring 41, the idler switching lever 46 is maintained in the E direction or in the F direction.

When the idler switching lever 46 is maintained in the F direction, the first
As shown in FIG. 1, the swing arm 15 is rotated clockwise (direction A) by one of the guide protrusions 46c. At this time, the rotation transmission member 14 is connected to the reel stand 11a for forward running and the gear 12c of the capstan on the right side of the figure.
Rotate to the side (forward driving mode). Further, when the idler switching lever 46 is maintained in the E direction, the swing arm 15 is moved by the guide protrusion 46b as shown in FIG.
is rotated counterclockwise (direction B). Then, the rotation transmission member 14 rotates toward the reel stand 11b for reverse running and the gear 12d on the left side of the figure (reverse running mode).

Therefore, the stopper 52b of the switching gear 50 is locked to the lock bin 47b, and the head base 30 fJs C
When the main body gear 18 (see FIG. 5) of the swinging arm 15 is fully advanced in the direction and enters the play mode, the main body gear 18 (see FIG. 5) meshes with either the gear 12c or 12d of the two capstans. At this time, the rear end portion 15f of the swing arm 15 is
The swing arm 15 is lowered below the chassis 16 by the spring 17 because it is not lifted up by the raised portion 55a shown in FIG. Therefore, as shown in FIG. 4B and FIG.
3b (during reverse running), or the teeth 22a of the second driven rotary gear 22 of the rotation transmission member 14 mesh with the large diameter gear 23a of the reel stand 11a (during forward running).

That is, when the main switching lever 45 is driven in the E direction by the path (dl) of the second branch protrusion 54b shown in FIG. The lever 46 is driven in the direction F. Therefore, the swinging arm 15 is rotated in the direction A, and the gear 1 driven by the motor is rotated.
The power of 2c is transmitted to the right reel stand 11a via the rotation transmission member 14, and the forward running mode is established. Further, when the main switching lever 45 is guided in the F direction by the path fel of the second branch protrusion 54b, the mode switching lever 36 is driven in the F direction, and the torsion spring 4
1, the idler switching lever 46 is driven in the E direction. At this time, the swing arm 15 is driven in the direction B, and the power of the motor is transmitted from the gear 12d of the left capstan to the left reel stand 11b via the rotation transmission member 14, and the reverse running mode is set.

In addition, as mentioned above, in the play mode, the swing arm 1
5 is lowered by the spring 17, and the 4th B
As shown in the figure or FIG.
The teeth 22a of the driven rotating gear 22 are the large diameter gear 2 of the reel stand.
3a or 23b. Therefore, the power of the motor is
It is transmitted from the gear 12c or 12d to the main body gear 18 of the rotation transmission member 14, and is transmitted via the friction member 21 and the second driven rotation gear 22 to the large diameter gear 23a or 23b of the reel stand 11a or 11b. In this case, gear 1
The rotational force 2c or 12d is applied to the second driven rotating gear 22 (further to the reel stand 11a or 11b) as rotational torque due to friction via the friction member 21. In this case, the rotational torque T2 generated through the friction member 21 located at a position with a short radius R from the center of rotation is, as described above, a value of about 40 to 50 cm-g, which is suitable for low-speed running of the tape. is set to
The main body gear 18 and the second driven rotating gear 22 are the friction member 2
It is designed to snop moderately through 1. In addition, the driven rotating gear 22 and the large diameter gear 23a or 2 of the reel stand
Due to the gear ratio 3b, the power transmitted to the reel stand is also decelerated to match the tape running speed.

FF-REW Switch to cue review mode FF or RE to fast forward or rewind the tape at high speed
In the W mode, or the cue/review mode in which the tape is fast forwarded or rewound at high speed with the magnetic head lightly touching the tape, the flywheel 12a or 12b is rotated at high speed by a motor (not shown).
The power of The necessary operations will be explained below.

When the solenoid S is energized for a short time and the trigger lever 47 is rotated counterclockwise from the play mode shown in FIG. The switching gear 50 is connected to the head base 3
Since it is biased clockwise by the return force of 0, when the lock is released, it rotates slightly clockwise and the missing part X2 comes off from the drive gear 12e, and the drive gear 12e meshes with the tooth 50a and the switching gear 50 is driven clockwise. The excitation time of the solenoid S is short, and the stopper 52c on the back surface of the switching gear 50 hits the lock pin 47b, and the switching gear 50 is locked here. At this time, as shown in FIG. 14, the missing portion
, and the transmission of power from the drive gear 12e is cut off. While transitioning from this play mode to high speed driving mode,
The switching gear 50 rotates clockwise from FIG.
The rotation angle shown in FIG. 14 is reached after passing through the diagrams. In the play mode shown in FIG. 11, the head base 30 is moved largely forward in the C direction by the corner 53a of the cam 53 provided on the switching gear 50, but in FIG.
b comes into contact with the bent piece 30b of the head base 30, and the head base 30 is returned slightly in the direction D compared to the play mode by the force of the spring. At this time, the magnetic head 32 provided on the head base 30 comes into light contact with the magnetic tape. Also, since the roller switching lever 35 provided on the head base 30 retreats to Dil'Eil, the spring holding grooves 35b and 35c retreat, causing either pinch roller P1 or P2, which had been in contact with the capstan, to switch to the cap. The capstan is separated from the stan, and the power from the capstan is no longer transmitted to the tape.

Next, switching of power transmission to the reel stand 11a or llb in the high-speed running mode will be explained.

The FF or cue mode is shifted by retracting the head base 30 from the forward running play mode shown in FIG. 11, and the REW or review mode is shifted to the first
A transition is made from the reverse running play mode shown in FIG. 2 by moving the head base 30 backward. For example, when shifting from the forward running play mode to the REW or review mode, the mode is first shifted to the stop mode, passed through the reverse running play mode, and then shifted to the high speed running mode.

For example, in the forward driving play mode shown in Fig. 11,
The idler switching lever 4 is activated by the torsion spring 41.
6 is moving in the F direction, which causes the swing arm 15 to move in the F direction.
is moved in the A direction, but when transitioning from this play mode to FF or cue mode, the 13th
As shown in the figure, the bent piece 46d is guided by the convex portion 57b formed on the inner peripheral surface 57 of the guide groove on the back surface of the switching gear 50, and the idler switching lever 46 is moved against the elastic force of the torsion spring 41. It is returned to the E direction. Therefore, the guide protrusion 46b provided on the idler switching lever 46
and 46c, the swing arm 15 is slightly returned in the direction B, and the rotation transmission member 14 is temporarily separated from the reel stand 11a. As shown in FIG. 14, when the FF or cue mode is set, the bent piece 46d enters the recess 57c of the inner peripheral surface 57 of the guide tube, and the idler switching lever 46 is moved in the F direction again by the torsion spring 41. Move to. Therefore, the swing arm 15 also moves in the A direction, and the rotation transmission member 14 is brought into engagement with the gear 12c and the reel stand 11a again.

Also, when transitioning from reverse play mode to REW or review mode, torsion spring 4
1, the idler switching lever 4 is biased in the E direction by
The bent piece 46d of No. 6 is returned in the -HF direction by the convex portion 58b of the outer circumferential surface 58 of the guide groove of the switching gear 50 shown in FIG. 3C, and the swing arm 15 is brought to the neutral position and power transmission is cut off. When the mode shifts to REW or review mode, the bent piece 46d enters the recess 58d in the outer circumferential surface 58 of the guide groove, the idler switching lever 46 moves again in the E direction, and the swing arm 15 is driven in the B direction to generate power. The transmission member 14 connects the left reel stand 11b and the capstan gear 12.
meshes with d.

FF/REW/Cue from play mode as above
7. When switching to the review mode, the rotation transmission member 14 temporarily leaves the power transmission path and then becomes in a state where power can be transmitted, but during the transition from the state in which power is cut off to the state in which power can be transmitted. , the raised portion 55a on the upper surface of the switching gear 50 shown in FIG. 3A moves to a state where the rear end portion 15f of the swing arm 15 is pushed up. Therefore, FF・R
In the EW/cue/review mode, as shown in FIG.
The teeth 20a of the small diameter gear 2 of the reel stand 11a or llb
4 Rise to the same height as a or 24b. Note that the gear 12c integrated with the flywheel 12a or 12b
and 12d are thick, so even if the rotation transmission member 14 is raised, the main body gear 18 is in a position where it can mesh with the gear 12c or 12d.

Therefore, in each of these modes, as shown in FIG. 4A and FIG.
(during reverse running), or the teeth 20a of the first driven rotary gear 20 of the rotation transmission member 14 mesh with the small diameter gear 24a of the reel stand 11a (during forward running).

- Therefore, in each of the above modes when the tape runs at high speed, the rotational force of the gear 12c or 12d integrated with the flywheel is transmitted to the main body gear 1 of the rotation transmission member 14.
8. It is transmitted to the small diameter gear 24a or 24b of the reel stand i1a or llb via the friction member 19 and the first driven rotating gear 20, so that the reel stand 11a or 11b is rotated at high speed.

In this case, the rotational torque due to friction applied from the main body gear 18 to the first driven rotating gear 20 via the friction member 19 is of a magnitude suitable for high-speed tape running (a value of about 100 cm-g), as described above. ) is set.

Note that when these tapes run at high speed, the capstan 13a or 13b also rotates together with the flywheel 12a or 12b, but since the pinch roller is held in a state where it is not pressed against the capstan 13a or 13b, the capstan The rotational force of the tape does not interfere with high-speed running of the tape.

In the illustrated embodiment, the mode switching lever 36 provided on the head base drives the idler switching lever 46 in the opposite direction via the torsion spring 41 to switch the movement of the rotation transmission member 14 to the reel stand. However, the idler switching lever 46 may be driven in the same direction as the mode switching lever 36 using an elastic member whose force point does not change.

Further, the switching gear 50 is provided with a cam 53, which drives the head base 30 in the C-D direction, but the head base is driven by a coupling mechanism other than the cam, such as a pin and a sliding hole. It's okay.

[Effect] As described above, according to the present invention, when the mode switching body provided on the head base is driven, the idler switching body is driven by the mode switching body via the elastic member, and the pair of reel stands are driven. The transmission of power is switched to. Further, the position of this idler switching body is controlled by a cam of a switching rotary body which is a driving source of the head base. In other words, the head base is moved to each mode position by the switching rotary body, and the position of the idler switching body is controlled by a cam formed on the same switching rotary body, so that the head base and the idler rotary body are moved from each other. For example, even if one unidirectional motor is used to transmit power to the reel stand, the timing can be controlled more easily without increasing the number of mechanisms. become able to.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view showing the mechanism of the drive unit of an auto-reverse type tape player, FIG. 2 is an exploded perspective view showing the switching mechanism, and FIG.
The figure is a plan view of the switching gear, Figure 3B is a side view thereof, and Figure 3C is a plan view of the switching gear.
The figure is a bottom view, Figures 4A and 4B are perspective views showing the power transmission section by mode, Figure 5 is a sectional view of the power transmission section, Section 6 is a sectional view of the rotation transmission member, and Figure 7. Figure 8 is a new view showing the power transmission to the rill stand for each mode, Figures 9A and 9B are partial plan views showing the pinch roller switching operation for each mode, and Section 10 shows the transition to the play mode. FIG. 11 is a plan view of the power transmission section showing play mode, FIG. 12 is a plan view of the power transmission section showing reverse play mode, and FIG. 13 is a transition to FF or cue mode. A plan view showing the power transmission part in the middle of
Section 14 is a plan view showing the power transmission section showing FF or cue mode. 11a, 11b--Reel stand, 12a, 12b--Flywheel, 12c, 12d...Gear, 12e...
Drive gear, 13a, 13b...capstan, 14.
... Rotation transmission member (idler rotating body), 15 ... Swinging arm, 16 ... Chassis, 30 ... Head base, 32 ... Rotating magnetic head, 35 ... Roller switching lever, 36 ...Mode switching lever, 45...Main switching lever, 46...Idler switching lever 47...
・Trigger lever, P, P2...pinch roller, 5
···solenoid. Figure 4A Figure 4B

Claims (1)

[Claims] 1. A pair of flywheels driven in opposite directions by a motor, a pair of reel stands into which a tape reel is loaded, and rotation of either of the flywheels by moving between the pair of reel stands. an idler rotating body that transmits data to the reel stand, a switching rotating body driven by the power of the motor, a locking mechanism that stops the switching rotating body at each mode position, a drive unit that operates the locking mechanism, and a switching unit that operates the switching rotating body. A head base that is stopped at each mode position according to each rotation stop position when the rotating body is locked, a magnetic head mounted on the head base, and a magnetic head that is movably supported by the head base and that is configured to switch. A mode switching body is moved in either direction by the switching rotary body at a predetermined time of rotation of the rotary body, and the switching force of the mode switching body is transmitted via an elastic member, and the mode switching body is moved in any direction according to the direction of movement. A mode of a tape player comprising: an idler switching body that moves an idler rotating body in the direction of either a flywheel or a reel stand; and a cam portion formed on the switching rotating body and controlling the position of the idler switching body. switching device