JPH03230355A - Mode switching device for tape player - Google Patents

Abstract

PURPOSE:To simplify a switching mechanism by holding a roller switching body on a position switched by a main switching body, advancing the roller switching body together with a head base and then separating the roller switching body from the main switching body so that the main switching body is used again as another driving source. CONSTITUTION:When a motor drives a switching rotor, the head base 30 is moved to set up a play mode or a stop mode. The main switching body 45 is driven by the switching rotor. When the head base 30 is positioned on a stop mode position or its nearby position, the roller switching body 35 on the head base 30 is driven by the main switching body 45 and an optional pinch roller is selectively switched. After completing the selective switching of the pinch roller, the head base 30 is advanced to a play mode position. At that time, the roller switching body 35 is separated from the main switching body 45, which can be driven again by the switching rotor independently of the roller switching body 35. Thereby, the main switching body is driven again so as to be used as the switching driving source of another mechanism. The switching mechanism is simplified by this constitution.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an auto-reverse type tape player,
In particular, the present invention relates to a mode switching device that allows switching of other members using the same switching drive source after selection switching of a pinch roller is performed.

[Prior Art 3] An auto-reverse tape player is provided with a pair of capstans driven in opposite directions and a pair of pinch rollers facing each capstan. In selecting and switching the tape between the forward running mode and the reverse running mode, the tape running direction in which the tape is fed by the capstan is switched by bringing either of the pair of pinch rollers into contact with the capstan. That is, in the forward running mode, the tape is pinched between the capstan rotating in the forward direction and the pinch roller, and the tape is fed in accordance with the rotating direction of the capstan. In the reverse running mode, the tape is pinched between the capstan rotating in the reverse direction and the pinch roller, and the tape is fed in accordance with the rotating direction of the capstan.

As a structure for performing the pinch roller selection switching operation described above, the roller switching lever is driven in either direction by a cam groove of the rotating body, and depending on the direction of movement of the roller switching lever, one of the pinch rollers is selected. In some cases, the head base is prevented from advancing toward the tape, and only one pinch roller is moved toward the capstan together with the head base.

[Problem to be Solved by the Invention] In the pinch roller selection switching operation described above, one of the pinch rollers is selected by driving the roller switching lever in the stop mode where the head base is retracted or in a position close to this. Afterwards, it is necessary to hold the roller switching lever at the selected position by the cam groove of the switching gear until the head base moves forward and one of the pinch rollers hits the capstan. Therefore, if it is necessary to operate other mechanisms at different timings after switching the pinch roller, the roller switching lever cannot be used for other operations, so the cam groove formed on the switching gear must be used. Therefore, if it is necessary to perform another operation, it becomes necessary to provide another cam or the like to the switching gear and another switching mechanism driven by the cam, and the structure of the switching mechanism is changed. It gets very complicated.

The present invention solves the above-mentioned conventional problems by making it possible to hold the roller switching body in the switching position after the pinch roller selection switching operation is performed, and reducing the switching power when switching the roller switching body. It is an object of the present invention to provide a mode switching device for a tape player that can switch other mechanisms at different timings.

[Means for Solving the Problems 1] A mode switching device for a tape player according to the present invention includes a pair of reel stands into which tape reels are loaded, a pair of capstans driven in opposite directions by a motor, and the capstans. A pair of pinch rollers facing each other, a switching rotary body driven by the power of a motor, a locking mechanism that stops the switching rotary body at each mode position, a drive unit that operates this locking mechanism, and this switching rotary body. A head base that is stopped at each mode position depending on the rotation stop position when the head is locked, a magnetic head mounted on this head base, and a main that is moved in either direction by the switching rotary body. a switching body; and one of the pair of pinch rollers, which is movably provided on the head base and moves to follow the movement of the main switching body at a position where the head base is retreated in a direction away from the tape loading section. a roller switching body that performs selection switching such that the head base is movable toward the capstan, and a roller switching body that is moved by the main switching body when the head base moves toward the tape loading section to the switching position. A holding member is provided to hold the holding member.

[Operation] In the above means, the head base is moved by the switching rotary body driven by the motor to set the play mode, stop mode, etc., and the main switching body is driven by the switching rotary body. When the head base is in the stop mode or a position close to this, the main switching member drives the roller switching member on the head base, thereby selecting and switching the pinch roller. After this pinch roller selection switching is completed, the head base moves forward to the play mode position, etc. At this time, the roller switching body moves forward together with the head base while being held at the switched position by the main switching body. Therefore, after that, the roller switching body is separated from the main switching body, and the switching rotary body can again drive the main switching body independently of the roller switching body. Therefore, it is possible to drive this main switching body again and use it as a driving source for switching other mechanisms.

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

1 to 8 show the structure of a mode switching device for a tape player according to the present invention, and FIG. 9A and subsequent figures 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.A flywheel 12a and a gear 12c are integrally provided at the base of the capstan 13b on the left side of the figure.
2b and gear 12d are integrally provided.

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 12b clockwise. driven to. 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.

A swing arm 15 rotatably supports the rotation transmission member 14 and swings the rotation transmission member 14 in the direction of arrow AB in FIG.

As shown in FIGS. 5 and 6 (both longitudinal 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 15b of the swing arm 15 is connected to the chassis 1
It is inserted into the hole of the protruding piece 16a of No. 6 and is swingably supported with respect to the protruding piece 1'6a. Therefore, the shaft portion 15a of the swing arm 15 moves along the arrow A in FIG.
The rotation transmitting member 14 supported by the shaft portion 15a is also swingable in the direction of arrow A in the figure.
It can swing freely in the B direction. Further, as shown in FIG. 1, the swing arm 15 has a pair of left and right bins 15c and
5d protrudes downward.

The bin 15c or 15d is guided in the left-right direction in the figure by a mechanism to be described later, and the swing arm 15 is thereby swung in the A direction or 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.

This oscillation causes a stop mode state (the state shown in FIG. 1) in which the rotational force of the gear 12c or 12d is not transmitted to either of the 11 units 11a and 11b, and a state in which the rotational force of the gear 12c on the right side in the figure is is transmitted to the reel stand 11a for forward running via the rotation transmission member 14, and a state in which 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.

As shown in FIGS. 4A and 4B (perspective views from the ■ arrow in FIGS. 1 and 12) and FIG. 5, the rotation transmission 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 different dimensions R1 and R2 (R,>R2), 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 20i3 and the second driven rotary gear 22 are supplied with each friction member from the main body gear 18, which rotates under the power of the flywheels 12a and 12b. In this embodiment, rotational torques due to different frictions are applied through the members 19 and 21. For example, the rotational torque T1 applied to the first driven rotation gear 20 is applied to the FF/REW mode or the cue/return mode. The rotational torque T2 given to the second driven rotating gear 22 is set to a value of about 100 cm-g, which is suitable for high-speed tape running in review mode, etc., and 40 to 40 cm-g, which is suitable for low-speed running of a play mode (recording or playback). 5
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 FIGS.
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. Further, when the tape runs at high speed, the swing arm 15 is pushed up as described above, and the swing arm 15 and the rotation transmission member 14 rise against the biasing force of the spring 17, as shown in FIGS. 4A and 8. As shown, 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 11b.

A switching mechanism for switching the rotation transmission member 14 or for setting other modes is provided on the upper and lower surfaces of the chassis 16 shown in FIG. 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. The direction of the rotary magnetic head 32 with respect to the tape running direction can be switched by 180° between forward running mode and reverse running mode.

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 30 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 are provided with pinch rollers P+ and Pz facing each other. The right pinch roller P1 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 low 2 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 largely rotated counterclockwise, but the right holder 37a is rotated clockwise by a small angle. Therefore, only the left pinch roller P2 is brought into pressure contact with the capstan 13b (reverse travel mode), and in FIG. 9B, the roller switching lever 35 is moved 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, and the tip of the bent portion 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 rotates greatly, and the right pinch roller P+ moves the capstan 13
Pressure contact with a (forward running mode).

As shown in FIGS. 1, 9A, and 9B, the chassis 1
A pair of guide grooves G and G are cut out and formed in the lower right part of 6 in the figure. 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,
When the head penis 30 moves forward a little in the C direction with the roller switching lever 35 moved in the F direction, the sliding protrusion 35d
enters the guide groove G2, and the state in which it moves inward in the B direction is maintained.

Next, as shown in FIG. 2, a pair of protrusions 36a and 36b are provided on the upper part of the mode switching lever 36, and these protrusions 36a and 36b connect to the grooves 30c and 30c of the head base 30.
0d, so that the mode switching lever 36 can move in the E-B 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 on this arm to project downward.

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 lower surface of the chassis 16.
It is supported so as to be slidable in the B direction, and is always urged in the B direction by a spring.

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 B 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 it can be pushed inward in direction B (9th
(See Figures A and 9B), and the main switching lever 45 has a pressing protrusion 45b extending forward. This pressing protrusion 45
b is opposed to a position where the pressed bin 36d of the mode switching lever 36 can be pressed inward in the direction B (see Fig. 1O), and an arm 4 is located at the left end of the main switching lever 45 in the drawing.
5c extends, and a bottle 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 inward in the E-B 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 inward in the direction B by the power of a lenoid 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 FIG. 2, 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 connected to a sub-chassis (not shown) disposed below the switching gear 50.
It is supported slidably in the E-B direction. A spring hole 46a is provided in the arm at the left end of the idler switching lever 46 in the figure.
is bored, and the arm of the torsion spring 41 is hung thereon. That is, the mode switching lever 36
and the idler switching lever 46 is a torsion spring 41.
connected by. As a result, as shown in FIG. 10, when the mode switching lever 36 moves in three directions, the idler switching lever 46 is moved inward by the elasticity of the torsion spring 41. Furthermore, when the mode switching lever 36 moves inward in the B direction, the torsion spring 4
1, the idler switching lever 46 is moved inward in the B direction.

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 bins 15c and 15d of the swinging arm 15 are sandwiched between the two bins 15c and 15d. The idler switching lever 46 is set to B.
When the swinging arm 1 moves inward, as shown in FIG.
5 is swung in the direction B (reverse travel mode) and the idler switching lever 46 is moved in the direction B, the swing arm 15 is swung in the direction A (forward travel 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 biased clockwise by a spring. When the solenoid S is energized and the plunger 48 is attracted, the trigger lever 47 is driven counterclockwise against the urging force of the spring. A lock bin 47b is provided on one arm of the trigger lever 47. This lock bin 47b is the switching gear 50
The lock pin 47b locks the switching gear 50 at a predetermined rotational position. Also,
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 is a 3m defective part X1. Xt, X- are formed, and this defective portion X1. Either Xa or Xs is drive gear 1
2e, the power of the drive gear 12e is not transmitted to the switching gear 50, as shown in FIG. 3C.
A guide step 51 along the circumference is formed on the back surface of the switching gear 50, and three triangular stoppers 52a, 52b, 52c extend from the guide step 51 toward the center.
is installed protrudingly. These stoppers 52a, 52b, 52
The lock pin 47b of the trigger lever 47 is opposed to the position through which the trigger c 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, either the stopper 52a, 52b52c hits the lock bin 47b. Sometimes the switching gear 50 is locked. When locked by the stopper 52a, the defective part xl
is opposed to the drive gear 12e (stop mode), and when locked by the stopper 52b, the missing portion x2 is opposed to 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. A bent piece 30b (
(see FIG. 2) is opposed to the outer peripheral surface of this cam 53. The head base 30 is biased in the D direction by a spring (not shown). Then, the switching gear 50 rotates, and the head base driving cam 53 pushes the bending piece 30b, so that the head base 30 is pushed out in the C direction. When the corner 53a of the cam 53 is in contact with the bent piece 3Qb, the head base 30 moves the most in the direction C, and the play mode is set (see FIG. 11). When the corner part 53b 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 cue, review,
One of the FF-REW modes is set (see FIG. 14).

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).A first branch protrusion 54a and a second branch protrusion 54b are provided in the guide groove 54. ing. 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. The inner peripheral surface 57 is formed with convex portions 57a, 57b and concave portions 57c, 57d. Further, the outer peripheral surface 58 is provided with convex portions 58a, 58b and concave portions 58c, 58d.

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 52a on the back side of the switching gear 50.
At this time, the switching gear 50 is locked. At this time, the missing portion x1 of the switching gear 50 faces the drive gear 12e. Further, the head base driving cam 53 provided on the top surface of the switching gear 50 is in a rotating position with its corner 53a facing downward in the figure, and the head base 30 is moved in the direction D by the force of the spring. It has been returned. Therefore, the magnetic head 32 on the head base 30 is connected to the cassette 1 (fifth
(see figure) away from the magnetic tape inside. Also, the roller switching lever 3 provided on the top surface of the Radbase 30
5 has also been returned to the D direction together with the head base 30. Therefore, the spring holding grooves 35b and 35c provided in both [1] parts of the roller switching lever 35 pull the wire springs 39a and 39b shown in FIG. 9A in the direction D, and each holder 37
Pinch rollers P1 and P0 attached to a and 37b are separated from capstans 13a and 13b. Further, the bent piece 46d of the idler switching lever 46 is held in a narrow portion (shown in FIG. 3C) inside the guide groove 56 on the back surface of the switching gear 50, as indicated by fal. At this time, the idler switching lever 46 is held at an intermediate position in the E-F direction by the narrow portion fa).

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 this case (within the axial direction of the reel stand), as shown in FIG. It is now in a lowered state.

When the power of the unit is turned on to the lay mode, or when the play mode of forward running or reverse running is set, the right flywheel 12a in FIG. 1 is driven counterclockwise by the motor, and the left flywheel 12b is driven counterclockwise by the motor. 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).
When it hits the lock pin 47b of the trigger lever 47,
The switching gear 50 is locked again, and the missing portion X of the switching gear 50 faces the drive gear 12e (the state shown in FIG. 11).
While the switching gear 50 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 and moves toward the 2nd position.
, the magnetic head 32 contacts the magnetic tape, and the 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 also disengages 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 switching is performed by the pressing pin 47c provided on the trigger lever 47. The pressed projection 45e of the lever 45 is pressed,
The main switching lever 745 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 lever After being driven in the -HF direction, the gear 45 is returned to the E direction by the force of the spring when the solenoid S is de-energized. Therefore, in accordance with the rotation of the switching gear 50, the bin 45d is moved from fbl to the first branch protrusion 54a shown in FIG. 3A.
pass by the side. Further, when the excitation time of the solenoid S is long, the main switching lever 45 is pushed in the F direction for a long time, so as the switching gear 50 rotates, the bin 45d is guided to the +el side of the first branch protrusion 54a. be done. That is, when the excitation time of the solenoid S for releasing the lock from the stop mode is short, the main switching lever 45 is in the state of moving in the E direction, and when the excitation time of the solenoid S is long, the first branch The protrusion 54a is driven in the F direction for the time it takes to pass.

As shown in FIG. 9A, when the main switching lever 45 is moving in the E direction, the suppression 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 starts to rotate, the head base 30 starts to be driven in the C direction by the cam 53 provided on the top surface thereof, 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 35d on the right side enters the guide groove 61 on the left side of the chassis 16. Also, when the rollers are switched and i<-35 is in the F direction, the head base 3
0 moves forward in the C direction, the sliding protrusion 35d enters the right guide groove 02. That is, depending on which side of the first branch protrusion 54a in FIG. 3A the pin 45d of the main switching lever 45 provided on the chassis 16 is guided.
The roller switching lever 35 is driven in the E direction or the F direction for a short time via the main switching lever 45, but as the head base 30 moves forward in the C direction at that time, the roller switching lever 35 moves into the guide groove of the chassis 16. G or G
2, and even after the first 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 G, the spring holding groove 35b on the right side of the roller switching lever 35 bends the wire spring 39a. The spring holding portion 35c on the left side 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 02, 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 drives the small gear 33, and the magnetic head 3
2 is rotated 180'' to switch the orientation corresponding to forward running of the tape or the orientation corresponding to reverse running of the tape.

Next, the switching of the power is performed after the pinch roller selection switching and head switching operations described above are performed, and before the switching gear 50 further rotates and the play mode is set. The switching gear 50 rotates, and the main switching lever 4
After the first branch protrusion 54a shown in FIG. 3A passes the position of the bottle 45d of No. 5, the second branch protrusion 54b
Pass through position d. At this time, if the solenoid S is de-energized, the main switching lever 45 remains moved in the E direction, and the bin 45d passes through the path indicated by fd+ in FIG. 3A. When the main switching lever 45 is energized and moved in the F direction by the pressing pin 47c of the trigger lever 47, the pin 45d is guided to the path indicated by fel 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 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 on the path dl shown in FIG. 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 11ag for forward running and the gear 12c of the capstan on the right side of the figure.
side (forward travel mode), and when the idler switching lever 46 is maintained in the E direction, the swing arm IS is rotated by its 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, when the stopper 52b of the switching gear 50 is locked to the lock bin 47b and the head base 30 is completely advanced in the C direction to enter the play mode, the swing arm 1
The main body gear 18 of No. 5 (see FIG. 5) meshes with either the gear 12c or 12d of the two capstans, and at this time, the rear end portion 15f of the swing arm 15 is lifted by the raised portion 55a shown in FIG. 3A. Since the swing arm 15 is not mounted on the chassis 16, the swing arm 15 is lowered below the chassis 16 by the spring 17. Therefore, as shown in FIGS. 4B and 7, the teeth 22a of the second driven rotation gear 22 of the rotation transmission member 14 mesh with the large diameter gear 23b of the reel stand 11b (during reverse running), or the rotation The teeth 22a of the second driven rotating gear 22 of the transmission member 14 are connected to the reel stand 1.
It meshes with the large diameter gear 23a of 1a (during forward running)
.

That is, when the main switching lever 45 is driven in the E direction by the path fdl of the second branch protrusion 54b shown in Section 3A, the mode switching lever 36 is also moved in the E direction, and the idler switching lever is activated by the torsion spring 41. 46 is driven in the F direction. Therefore, the swing arm 15 rotates in the direction A, and the gear 1 driven by the motor
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 (el) of the second branch protrusion 54b, the mode switching lever 36 is driven in the F direction, and the torsion spring 41
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.
Reverse driving 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, so 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 to the reel stand 11. In this case, the rotational force of the gear 12c or 12d is transmitted to the large-diameter gear 23a or 23b of the gear 12a or 11b as a rotational torque due to friction via the friction member 21. 11a or 11b). In this case, radius R1 from the center of rotation
As mentioned above, the rotational torque T2 generated through the friction member 21 located at a short position is set to a value of about 40 to 50 cm-g, which is suitable for low-speed tape running. The driven rotary gear 22 is configured to appropriately slip through the friction member 21.

Furthermore, the power transmitted to the reel stand is also decelerated to match the tape running speed by the gear ratio between the driven rotary gear 22 and the large diameter gear 23a or 23b of the reel stand.

FF-REW/Cue/Review mode FF or REW mode that fast forwards or rewinds the tape at high speed, or Cue/Review mode that fast forwards or rewinds the tape at high speed with the magnetic head lightly touching the tape. , the power of the flywheel 12a or 12b rotated at high speed by a motor (not shown) is transmitted to the reel stand 11a or llb.
Alternatively, the magnetic head may be rotated at high speed, the magnetic head may be returned to a position where it lightly contacts the tape, and the pinch roller may be separated from the capstan.The operations required for this will be described 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 the 14th section, the missing part X of the switching gear 50 is connected to the drive gear 12e.
, the transmission of power to the drive gear 12e is cut off. While this play mode transitions 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. In addition, since the roller switching lever 35 provided on the head base 30 retreats in the D direction, the spring holding grooves 35b and 35c move back, causing either pinch roller P or P2, which had been in contact with the capstan, to move back to the cap. The capstan is separated from the stan, and the power from the capstan is no longer transmitted to the tape.

Here, 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 running 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 guide groove inner peripheral surface 57, 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 once returned in the direction F 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.

As above, from play mode FF-REW/cue/
When switching to review mode, the rotation transmission member 14
temporarily leaves the power transmission path and then becomes in a state in which 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 switching gear 5 shown in FIG. 3A
The raised portion 55a on the upper surface of 0 is the rear end 15 of the swing arm 15.
The state moves to a state where f is pushed up. Therefore, FFREW・
In the cue review mode, as shown in FIG.
0a rises to the same height as the small diameter gear 24a or 24b of the reel stand 11a or llb. Furthermore, the gears 12c and 12d are integral with the flywheel 12a or 12b.
is thick, so even if the rotation transmission member 14 rises, the main body gear 1
8 is a position where it can mesh with 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 transferred 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 11a or llb via the friction member 19 and the first driven rotation 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 a magnitude suitable for high-speed tape running (approximately 100c+s-g) as described above. value).

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 roller switching lever 35 is
However, the mechanism for holding the roller switching lever at the switching selection position is not limited to the guide grooves 61 and G, and a member having a holding groove may be provided separately on the chassis, or a member having a holding groove may be provided separately on the chassis, or the mechanism for holding the roller switching lever at the switching selection position may be A lock lever that holds the roller switching lever 35 is biased by a spring to prevent the lock lever from coming off the stopper on the chassis 16 when the head base moves forward in the direction C after the pinch rollers have been switched. , this causes the lock lever to
It is also possible to forcibly hold the roller switching lever 35.

[Effect] As described above, according to the present invention, the main switching body is driven by the switching rotary body, and the main switching body can hold the moved roller switching body, so that the head base can move forward. While reaching the play mode etc., it is possible to drive other mechanisms by the main switching body. Therefore, the drive mechanism consisting of the switching rotary body and the main switching body enables switching operations other than the selection and switching of the pinch rollers, and the switching mechanism can be simplified.

Further, by using the main switching body, it is possible to switch various mechanisms by shifting the timing from the selection switching operation of the pinch roller, and the degree of freedom in design is increased.

[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 unit, Figure 6 is a sectional view of the rotation transmission member, and Figure 7. Figure 8 is a sectional view showing power transmission to the rill stand by mode, Figure 9A and Figure 9.
Figure B is a partial plan view showing the pinch roller switching operation by mode, Figure 10 is a plan view of the power transmission section showing the transition to the play mode, Figure 11 is a plan view of the power transmission unit showing the play mode, FIG. 12 is a plan view of the power transmission section showing the reverse drive play mode, FIG. 13 is a plan view of the power transmission section showing the transition to FF or cue mode,
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... Swing arm, 16... Chassis, 30... Head base,
32...Rotary magnetic head, 35...Roller switching lever, 36...Mode switching lever, 45...Main switching lever, 46...Idler switching lever 47...
Trigger lever, P+, P*...pinch roller, S.
··solenoid. Figure 4A Figure 4B

Claims (1)

[Claims] 1. A pair of reel stands into which tape reels are loaded, a pair of capstans driven in opposite directions by a motor, a pair of pinch rollers facing each of the capstans, and a switching device driven by the power of the motor. A rotating body, a locking mechanism that stops this switching rotating body at each mode position, a drive unit that operates this locking mechanism, and each mode position according to each rotational stop position when this switching rotating body is locked. a head base that is stopped at the head base; a magnetic head mounted on the head base; a main switching body that is moved in either direction by the switching rotary body; a roller switching body that moves to follow the movement of the main switching body at a position retreated in a direction away from the loading section, and performs selection switching such that one of the pair of pinch rollers can move toward the capstan; A mode switching device for a tape player, comprising: a holding member that holds a roller switching body moved by the main switching body in the switching position when the head base moves toward the tape loading section.