CN1037299C - Automatic flipping device for tape recorder - Google Patents

Abstract

The object of the present invention is to provide an automatic reversing device for a tape recorder which can reliably switch the running direction of a tape with a small space. It transmits the rotation to the tooth-missing gear through the sliding and rotating transmission mechanism, and uses the transmission gear that meshes with it and rotates half a circle to make the tape running direction switching plate that changes the tape running direction move to the left and right, and is used in the tape running direction at the same time. The conversion plate is at the mobile terminal in the left and right directions, and the reaction force acting on the tape running direction switching plate makes the transmission gear be subjected to the effect of continuing to rotate, so that the tape running direction switching plate remains on the mobile terminal position.

Description

Automatic flipping device for tape recorder

The present invention relates to a reversing device for a tape recorder capable of switching the running direction of a tape by changing the rotation direction of a motor in a small space.

The automatic reversing device of the tape recorder that converts the tape running direction of the tape with the rotation direction of the conversion motor, as disclosed in the Japanese Utility Model Publication No. 41295 in 1991, is composed of a pinch wheel switching mechanism and a tape running direction switching mechanism and It is composed of a holding mechanism that holds the tape running direction switching plate that operates the pinch roller switching mechanism at the terminal position that moves to one or the other.

The pinch wheel switching mechanism moves to one side or the other through the tape running direction switching plate, and the arm formed on the tape running direction switching plate makes the support arm supporting the pinch wheel rotate alternatively, and the pinch wheel is relative to its position. The crimp state transition of the corresponding capstan.

The tape running direction conversion mechanism is composed of a Y-shaped rocking bar connected to the tape running direction changing plate, a cam device arranged on the two ends of the rocking bar and a movable gear driven by the motor rotation direction conversion.

Moreover, the movable gear rotates with the rotation direction of the motor, and the movable gear is alternately meshed with the cam device to rotate the cam device, and the arm rotates the rocker in a given direction by the rotation of the cam device. Turn to move the deck switcher to one side or the other.

The movable gear mentioned above is constantly meshed with the intermediate gear that transmits the rotation of the motor. When the direction of rotation of the intermediate gear is changed by changing the direction of rotation of the motor, together with the rotating plate that supports the movable gear, on the outer periphery of the intermediate gear, It revolves in the same direction as that of the intermediate gear.

The rotational force of the movable gear is generated by the rotational load of the movable gear itself, and in order to allow the rotating plate to mesh with the movable gear and the intermediate gear at all times, the fulcrum of rotation is supported coaxially with the rotating shaft of the intermediate gear.

The holding mechanism consists of a running direction changing plate and a base plate, and a reversing spring installed between them. The reverse spring is made so that when the rotation of the rocker lever moves the tape running direction switching plate to a position beyond the fulcrum of the reverse spring, the elastic force of the reverse spring makes the tape running direction switching plate move to the moving direction again, and the reverse spring The elastic force keeps the running direction changer plate in the moving end position.

The above-mentioned automatic reversing device is that the movable gear revolves according to the rotation direction of the motor, and uses this to change the moving direction of the tape running direction conversion plate. Therefore, it is necessary to make the movable gear have a large space for revolution, so the arrangement of parts on the substrate is affected. There is a limit problem.

In addition, since the rotating plate is rotated by the rotating load of the movable gear itself, the rotating force is extremely weak. Therefore, it is necessary to find a way not to add the rotating load to the rotation of the rotating plate, but in the case of reducing the rotating load of the rotating plate Under the circumstances, sometimes when the tape recorder is subjected to an external impact, the rotating plate will rotate, causing the problem of changing the direction of tape travel, and reducing the reliability of the device.

In addition, when lubricating oil is applied to the rotating plate in order to reduce the rotational load of the rotating plate, as a result, dust is adsorbed on the lubricating oil, and the amount of dust increases, conversely increasing the load. Therefore only a very limited amount of lubricating oil can be used and it can only be applied in a very limited number of places.

In addition, since the reversing spring is used as a holding mechanism for keeping the running direction switching plate at a position moved to one or the other, a space for the reversing spring to rotate is required. The configuration of other parts is limited.

The object of the present invention is to provide an automatic reversing device for a tape recorder capable of switching the tape running direction with a small space.

The automatic turning device of the tape recorder of the present invention is characterized in that it has: accept the rotational force of motor on the base plate, carry out the driving gear of positive and negative rotation and have first, second tooth-missing part, by making first, second tooth-missing part The toothed part formed between meshes with the drive gear to rotate positively and negatively. At the same time, when the first and second tooth-missing parts face the drive gear, it prevents the tooth-missing gear from rotating in the direction of rotation, and transmits it through the sliding transmission structure. The rotation force output from the motor causes the toothless gear to rotate in the forward or reverse direction; and the coupled part having a link with the coupling part of the running direction changeover plate rotates by meshing with the toothed part of the toothless gear A transmission gear that moves the tape running direction changing member to one side or the other according to the direction of rotation at the same time for half a turn or slightly more than half a turn; and at the end of rotation of this transmission gear, it is connected with the joint of the transmission gear to prevent The part that prevents the transmission gear from rotating in the direction of further rotation.

The automatic overturning device of the tape recorder of the present invention also has the following features, that is: the coupling part of the above-mentioned tape running direction conversion plate forms an inclined surface, and it is the transmission gear on the left and right rotation terminals, which presses the connected part to make the transmission gear to the left and right rotation terminals. Continue to act in the direction of rotation; in addition, the device also has: when the transmission gear is close to one or the other end of the rotation, the elastic member acts on the transmission gear in the direction of making the connected part and the blocking part meet.

In addition, it is equipped with a transmission gear and a pressing mechanism, and the transmission gear is configured to mesh with the toothless gear that rotates positively and negatively, and rotates half a circle or a little less than half a circle, and at the same time transmits the arc motion of the connected part to the walker. The tape direction changing member moves the tape running direction changing member to one side or the other, and when the tape running direction changing member is not driven, it faces the missing tooth portion of the missing tooth gear; the pressing mechanism is at least on the toothed Before the part is not meshed with the above-mentioned transmission gear, it is used as a reverse force acting on the tape running direction conversion member, so that the transmission gear is continuously subjected to the effect in the direction of continuous rotation.

That is to say, the present invention proposes the automatic turning device of tape recorder, and this device is equipped with a pair of capstan pulleys, a pair of tape reel shafts and a pair of pinch rollers; Move, so that a pair of pinch rollers can be crimped on the corresponding capstan wheels; and the motor can be rotated positively and negatively to drive the tape reel shaft on the tape take-up side and the tape travel direction conversion plate; when the travel When the belt direction conversion plate is at the moving terminal position, the reaction force of the crimping force of the belt pressure wheel and the capstan pulley acts on the belt direction conversion plate in the direction of back pressure. It is characterized in that the device also has:

a drive gear rotationally driven by the motor;

The transmission gear is free to reciprocate and rotate within a certain angle range, and is engaged with the tape running direction switching plate to move the switching plate to one side or the other;

Missing gears have a pair of missing teeth, which can be rotated reciprocally within 180°. At the rotation terminal position, each missing tooth part is opposite to the drive gear and the transmission gear at the same time. Outside the rotation terminal position, the two missing teeth Each toothed part between the parts meshes with the drive gear and the transmission gear) at the same time;

The part of the said tape running direction conversion plate connected with the transmission gear is made into such an inclined surface, when the tape running direction conversion plate is at the moving terminal position, the transmission gear is squeezed on the rotation terminal position;

The starter gear accepts the rotational force of the motor, presses the toothless gear to the end position of rotation, and with the reverse rotation of the motor, each toothed part of the toothless gear meshes with the driving gear and the transmission gear at the same time, and the rotational force of the motor passes through the The driving gear, the tooth-missing gear and the transmission gear are transmitted to the belt-running direction conversion plate, and a pair of pinch pulleys are used for the clutch switching of each capstan.

Wherein, a stopper portion that limits the rotation angle of the transmission gear is formed on the base plate of the recorder.

Wherein, a stop portion that limits the rotation angle of the transmission gear is formed on the running direction switching plate.

The automatic turning device of the tape recorder of the present invention has the following effects.

It transmits the rotation of the motor through the sliding and rotating transmission mechanism, and uses the rotation direction conversion of the moving and rotating starter gear to control the meshing of the missing tooth gear and the driving gear. Each gear does not revolve, so the movement is relatively stable, and because it is all supported on the base plate, it takes up less space.

In addition, since the transmission gear that moves the tape running direction changeover plate is at the position of half a circle or a little more than half a circle, the connecting part and the blocking part are connected to prevent the transmission gear from rotating in the direction of continuous rotation, and the running The reaction force of the tape direction changing plate has the effect of rotating it in the direction where the coupling portion and the blocking portion meet, so that the tape running direction changing plate can be held in a position after being moved to one or the other.

Even if the rotation of the drive gear is made slightly less than half a turn, the drive gear is continuously driven by the reaction acting on the tape running direction changing member before the drive gear and the toothed portion of the tooth-missing gear are not meshed. The pressing mechanism acting in the direction of continuous rotation can keep the tape running direction switching member at the position after moving to one or the other.

Fig. 1 is a mechanism plan view showing a tape recorder of a first embodiment of the present invention;

Fig. 2 is a partial plan view of the first embodiment;

Figure 3 is an exploded oblique view of the first embodiment;

Fig. 4 is the rear view of the first embodiment;

Fig. 5 is a partial plan view of the second embodiment;

Fig. 6 is a partial plan view of a third embodiment;

Fig. 7 is a plan view showing the action relationship of forces in the third embodiment.

Next, please refer to FIG. 1 to FIG. 4 to describe the first embodiment of the present invention. The tape recorder of Fig. 1 is made on the substrate 1 and is installed with a pair of capstan shafts 3a, 3b driven by the motor 2 and rotating in the same direction freely; , 4b can be freely rotatably installed on the support arms 5a, 5b; between a pair of capstan wheels 3a, 3b, the head mounting plate 7 that is provided with the magnetic head 6 can be installed on the base plate 1 freely advancing and retreating; when the head is installed When the plate 7 advances and moves to the playback position of the tape, the magnetic head 6 slides in contact with the tape of the tape recorder not shown in the figure, and reproduces the signal.

The running direction changeover plate 10 is mounted on the base plate 1 freely movable left and right along a direction perpendicular to the moving direction of the head mounting plate 7, as described below, by means of a drive provided on the lower surface of the base plate 1. The tape direction switching mechanism moves the tape running direction switching plate 10 left and right, thereby switching the tape running direction.

Further, by moving the running direction changing plate 10 left and right, an unshown rotation transmission mechanism corresponding to a pair of reel shafts 8a, 8b rotatably mounted on the base plate is operated alternatively. This rotary transmission mechanism is made so that when the tape running direction changeover plate 10 moves to the left or right, it can transfer the rotation output by the motor to the tape rollers 4a, 4b and the capstans 3a, 3b to press the tape on one side alternatively. on the disc axles 8a, 8b.

The pinch wheel conversion mechanism 12 that makes the pinch rollers 4a, 4b alternatively crimped on the corresponding capstan shafts 3a, 3b is composed of a rotating plate 13 that is freely rotatably installed on the head mounting plate 7, and this The rotating plate 13 is composed of a cylindrical spring 14 rotatably supported on the rotating plate 13 , and a moving plate 16 movably supported on the head mounting plate 7 having a connecting portion 15 connected to the rotating plate 13 .

This moving plate 16 is connected to one end on the tape running direction switching plate 10. When the tape running direction switching plate 10 moves to the left or right direction, correspondingly, the connecting part 15 of the moving plate 16 makes the rotating plate 13 Turn left or right together with cylinder spring 14. Due to the rotation of this cylindrical spring 14, the front end of the cylindrical spring approaches the capstan on one side, and the other side leaves from the capstan on the other side.

When the head mounting plate 7 is at the playback position, due to the movement of the running direction changing plate 10, the front end of the cylindrical spring 14 rotating in the direction close to the capstan rotates the support arm 5b, so that the pinch roller is pressed against the capstan. on the corresponding leading wheel.

FIG. 1 shows a state where the right pinch pulley 4b is in pressure contact with the right capstan pulley 3b.

When the direction of travel changeover plate 10 moved to the left from the state shown in Figure 1, the moving plate 16 connected to it also moved to the left, and due to the movement of the moving plate 16, the rotating plate 13 connected to the moving plate moved clockwise. turn. Then the cylindrical spring 14 also rotates together with the rotating plate 13, and the front end 14a of the cylindrical spring on the left side makes the support arm 5a rotate counterclockwise, so that the tape running wheel 4a on the left side is crimped on the capstan 3a.

On the other hand, since the right cylindrical spring front end 14b rotates the right support arm 5b counterclockwise, the right pinch pulley 4b is separated from the capstan pulley 3b.

When the cylindrical spring 14 makes the pinch roller crimp on the corresponding capstan, the reaction force of the crimping force is transmitted to the tape running direction switching plate 10 through the rotating plate 13 and the moving plate 16, which is opposite to the moving direction of the tape running direction switching plate The ground acts on the running direction changing plate 10. That is, the reaction force acts to move the tape running direction changing plate 10 to the right.

The running direction switching mechanism for moving the running direction switching plate 10 left and right is provided on the lower surface of the base plate as shown in FIG. 2 . FIG. 2 is an enlarged view around the capstan shaft 3b on the right side of FIG. 1, and shows the substrate 1 and the tape running direction changing plate 10 with dashed-two dotted lines.

The angle post (joined part) 22a of the transmission gear 22 described below and the fitted guide hole 18 (joint part) are arranged on the tape running direction switching plate 10, and the corner post 22a is pressed against the guide hole 18 by the rotation of the transmission gear 22 Therefore, the corner post 22a fitted in the guide hole 18 makes the tape running direction changing plate 10 move left and right against the above-mentioned reaction force.

Also formed on the guide hole 18 is that when the corner post 22a is moved to the terminal end, the corner post 22a is pressed so that the corner post 22a is pressed to the circular arc hole 1a of the substrate 1 shown in FIG. 3 . Inclined face 18b on terminal 1b, 1d (blocking part).

On the lower surface of the base plate 1, a flywheel 19 mounted on the capstan 3a, a pinion 20 (drive gear) integrated with the flywheel 19, a first tooth-missing portion 21a, and a tooth-missing gear 21 facing the pinion 20 , and the transmission gear 22 facing the second missing tooth portion 21b of the tooth missing gear 21 are rotatably supported on the base plate 1 .

The endless endless belt that transmits the rotation of motor 2 is hung on the outer periphery of flywheel 19, and when motor 2 switches towards the direction of rotation, the rotation of flywheel 19 is also converted according to the direction of rotation of the motor.

A starting gear 23 having a smaller diameter than the pinion 20 is rotatably mounted on the above-mentioned capstan 3b above the pinion 20, and the shaft hole 23a of the starting gear 23 is divided into two parts as shown in FIG. , Open this shaft hole 23 with the axle diameter of capstan 3b, this starting gear is pressed on the capstan 3b. This press-fitting can be accomplished with an extremely small pressure, so the fitting force between the shaft hole 23a and the capstan 3b is extremely weak.

The starter gear 23 rotates following the rotation of the capstan 3b by this fitting force and the viscosity of the lubricant coated in the shaft hole 23a, and at the same time, when an excessive load is applied to the starter gear 23, it stops rotating and Slip occurs between the inner periphery of the shaft hole 23a and the outer periphery of the capstan 3b.

As shown in FIG. 3 , on the tooth-missing gear 21 , a large-diameter gear 21 c that is always meshed with the starter gear 23 and first and second tooth-missing parts that are smaller in diameter than the large-diameter gear 21 c are integrally formed. A toothed portion 21d formed between 21a, 21b, and a circular arc groove 21e protrudingly provided on the lower surface of the base plate 1 into which the brake lever 1c is inserted.

And Fig. 3 is in order to clearly show the connection relationship between the large-diameter gear 21c and the toothed portion 21d of the tooth-missing gear 21 and other gears, and is shown in a cut-off and separated state.

The arc angle of the arc groove 21e is made such that when the first and second tooth-missing portions 21a, 21b face the pinion 20, the brake lever 1c is aligned with the terminal ends 21k, 21m of the arc groove. catch.

The shaft hole 21f of the missing tooth gear 21 is divided into two parts so that when it is attached to the support shaft 1e provided on the base plate 1, it can be opened by the support shaft 1e and pressed into the groove 1f of the support shaft 1e. Furthermore, between the outer wall of the bearing portion 21g forming the shaft hole 21f and the tooth-missing gear 21, elastically displaceable arms 21h facing parallel to the tooth-missing portions 21a, 21b are connected. A gap portion 21j is also formed between the bearing portion 21g and the arm 21h and the tooth-less gear 21 .

When the toothed portion 21d and the pinion 20 start meshing and the initial tooth tops of the toothed portion 21d contact the tooth tops of the pinion 20, the rotational force of the pinion 20 elastically displaces the arm 21h, thereby This moves the tooth-missing gear 21 in the radial direction, so that the arm 21h can avoid the state where the tops of the teeth touch each other.

On the transmission gear 22, an angle post 22a is arranged at an eccentric position. When the transmission gear 22 is mounted on the base plate 1, the angle post is inserted into and passed through the arc hole 1a provided on the base plate 1, and protrudes on the base plate 1. surface side, and fit in the guide hole 18 of the tape running direction changing plate 10.

The arc angle of the arc hole 1a of the base plate 1 is made such a size that when the toothed part 21d of the transmission gear 22 and the tooth-missing gear 21 is engaged to make the tooth-missing gear 21 rotate a little more than half a circle, the corner column 22a just joins with the terminal ends 1b, 1d of the arc hole 1a.

Moreover, as shown in Fig. 2 and Fig. 4 viewed from the opposite direction, on the lower surface of the base plate 1, there is also a device on the lower surface of the base plate 1, when the transmission gear 22 is rotated to make the tape travel direction changeover plate 10 move left or right, the transmission gear 22 The rotary terminal has a tension spring 24 that makes the transmission gear 22 continue to rotate in the direction of rotation.

The elastic force of the tension spring 24 presses the protrusion 22b provided on the eccentric position of the transmission gear 22 through the tension spring 24, and presses the transmission gear 22 towards the terminal direction of the rotation direction for the rotation in both directions. The elastic force of this tension spring 24 has just been added, and it is the auxiliary force that makes transmission gear 22 keep on the rotation terminal position more surely.

As shown in FIG. 2 , in the state after the tape running direction changing plate 10 has moved to the right, the angle post 22 a is in a position where the tape running direction changing plate 10 moves through the rotation axis of the transmission gear 22 and rotates slightly beyond the trajectory line 25 , and the corner post 22a is in a state of being in contact with the terminal end 1b of the arc hole 1a of the substrate 1 at this position.

In this way, due to the reaction force of the cylindrical spring 14 acting on the tape running direction conversion plate 10 through the inclined surface 18b of the guide hole 18 to generate component force, and the elastic force of the tension spring 24, the corner post 22a is pressed to the arc. The terminal end of the hole 1a can therefore reliably hold the transmission gear 22 at the terminal position in the rotational direction. And by holding the drive gear 22 at the rotational direction end position, the running direction switching plate 10 is also held at a position shifted to the right.

Next, the operation of the automatic reversing device of the first embodiment will be described.

In the state of FIG. 1 , by pressing the right pinch wheel 4b on the capstan 3b, the capstan 3b is driven by the motor 2 to rotate counterclockwise, and the tape is sent from the left to the right. And the conveyed audio tape is rewound by the tape reel shaft 8b on the right side.

At this time, the tooth-missing gear 21, as shown in Figure 2, transmits the clockwise rotation force to the large-diameter gear 21c meshed with the starting gear 23 by the starting gear 23 rotating counterclockwise. Due to this rotational force, one end side terminal 21k of the arc groove 21e contacts the brake lever 1c, and the rotation is prevented in a state where the first tooth-missing portion 21a of the tooth-missing gear 21 faces the pinion 20. The rotational force constitutes the frictional force generated by the bearing 23a of the starter gear 23 sliding on the outer periphery of the capstan 3a.

The transmission gear 22 facing the second missing tooth portion 21b of the missing tooth gear 21 moves the tape running direction changing plate 10 to the right direction, whereby the reaction force of the cylindrical spring 14 has the tape running direction changing plate 10 to the left direction. As a result of movement, this force passes through the inclined surface 18b of the guide hole 18 and presses the corner post 22a in the counterclockwise direction.

Because of this rotational force, the angle post 22a is pressed onto the terminal 1b of the circular arc hole 1a of the base plate 1, and the transmission gear 22 is subjected to the effect of continuing to rotate towards the terminal end of the rotation by the elastic force of the tension spring 24.

Therefore, the transmission gear 22 is kept in a state of being opposed to the second tooth-missing portion 21b of the tooth-missing gear 21, and at the same time, is kept in a state of moving the running direction changing plate 10 to the right.

When the operation of switching the tape running direction is started from this state, the rotation direction of the motor 2 is directly switched. Like this, flywheel 19, capstan 3b, pinion 20, starter gear 23 are switched towards the rotation direction, and starter gear 23 rotates clockwise on Fig. 2 .

Then, the direction of the rotation action of the toothless gear 21 by the starter gear 23 is also reversed, and the toothless gear 21 is rotated counterclockwise by this rotation action, so that the toothed portion 21d meshes with the pinion. When the toothless gear 21 starts to rotate counterclockwise due to the rotational force of the pinion 20, the transmission gear 22 facing the second toothless part 21b also meshes with the toothed part 21d and starts to rotate clockwise.

When the transmission gear 22 starts to rotate clockwise, the angle post 22a moves in the guide hole 18 and presses the side surface 18a of the guide hole 18, so that the tape running direction changing plate 10 moves to the left. When the toothed portion 21d of the tooth-missing gear 21 turns slightly more than half a revolution of the transmission gear 22, the first tooth-missing portion 21a and the transmission gear 22 face each other.

On the other hand, at this time, the second tooth-missing portion 21b faces the pinion 20, and the other terminal end 21m of the circular arc groove 21e of the tooth-missing gear 21 contacts the brake lever 1c, so that the tooth-missing gear 21 The rotation caused by the action of the pinion 20 stops. However, since the starter gear 23 continues to rotate clockwise, the large-diameter gear 21c is subjected to a counterclockwise rotational force, and the second tooth-missing portion 21b remains in a state facing the pinion 20 by the rotational force of the starter gear 23 .

The running direction changing plate 10 moved to the left by the clockwise rotation of the transmission gear 22 moves the moving plate 16 to the left, whereby the connecting portion 15 rotates the rotating plate 13 clockwise. By the rotation of the rotating plate 13, the cylindrical spring 14 rotates the left support arm 5a counterclockwise, and the pinch wheel 4a on the left side is crimped on the capstan shaft 3a on the left side, so that the tape is sent out to the left.

On the other hand, when the right side support arm 5b is rotated counterclockwise by the cylindrical spring 14, the right side pinch roller 4b is separated from the right side vertical guide shaft 3b.

And, in the middle of moving the tape running direction changing plate 10 to the left side, the rotation transmission switching mechanism is operated, and the rotation of the rotation transmission switching mechanism motor 20 is transmitted to the left tape reel shaft 8a, and the pinch tape from the left side is wound up by it. Wheel 4a and capstan 3a send out the tape. Furthermore, the rotation transmission of the motor 2 to the right tape reel shaft 8b is cut off.

Like this, the automatic reversing device of tape recorder of the present invention is by the conversion of the rotation direction of motor 2, makes the rotation direction conversion of toothless gear 21, transmission gear 22, just can make tape running direction conversion plate 10 move to one side or other side, thereby makes The tape running direction is switched to the right or left direction.

When the above-mentioned left pinch pulley 4a is crimped on the left capstan 3a, the reaction force of the cylindrical spring 14 has the effect of moving the tape running direction conversion plate 10 to the right. The inclined surface 18b formed on the guide hole 18 of the tape running direction conversion plate 10 makes the transmission gear 22 rotate clockwise and presses the angle post 22a. When the angle post 22a of the transmission gear 22 is connected to the other end side 1d of the arc-shaped hole 1a of the base plate 1, the transmission gear 22 can be kept at a position where it is rotated in the clockwise direction.

Above-mentioned first embodiment, owing to be to use the gear that rotatably supports on the base plate 1 when the conversion of the direction of rotation of motor 2 makes the tape running direction of tape, the tape running direction of tape is converted, it is unnecessary to make gear The inversion thus enables the space to shrink.

In addition, because the holding mechanism that keeps the tape running direction changeover plate 10 at a position moved to one side or the other is to use the inclined surface 18b of the guide hole 18; The stopper parts 1b, 1d for preventing the further rotation of the transmission gear 22; and the tension spring 24 for subjecting the transmission gear 22 to the rotation in the direction of continuous rotation, thereby miniaturizing the holding mechanism. Furthermore, since it is not necessary to reverse the respective gears, the switching operation of the tape running direction can be performed smoothly.

What above-mentioned embodiment is to prevent transmission gear 22 from making the stop part 1b, 1d that half circle rotates is made as the two terminal ends of arc hole 1a that is arranged on the base plate, but is not limited to this form, for example shown in Fig. 5 In the second embodiment, in the guide hole 31 of the tape running direction changing plate 30, a recess 31b is formed on the edge 31a of the corner post 22a which is slidably connected, and one surface of the recess is used as the stop portion 31c, and the other surface 31d is used as the blocking portion 31c. Press the face of the drive gear in the direction of rotation.

And when the center of this concave portion 31b is configured to pass through the rotation center of the transmission gear 22, even if the transmission gear 22 rotates half a turn, the corner post 22a is combined in the concave portion 31b, so that the tape travel direction switching plate 10 can be kept on the mobile terminal. position.

Above, it is explained that the combined part is made into a corner column, and it can also be a column.

Next, the third embodiment will be described with reference to Figs. 6 and 7, in which the same components as those of the first embodiment are denoted by the same symbols.

FIG. 6 is an enlarged view around the right vertical guide shaft 3b in FIG. 1, and the base plate 39 and the tape running direction changing plate 40 are indicated by dashed-two dotted lines.

On the running direction switching plate 40, a pin B provided on one end of a rocking plate 41 (a rocking member serving as a pressing mechanism) is movably mounted in a supporting hole 40a.

The rocker plate 41 is provided with a guide groove 41a (guide portion) into which a column 42a (joined portion) of a transmission gear 42 described later is fitted and a pin C on the other end. This pin C is fitted in a groove 39 a provided on the base plate 39 in a direction perpendicular to the moving direction of the running direction changing plate 40 , the center of which passes through the rotation center of the transmission gear 42 .

Between the pin B and the pin C, a guide groove 41a is formed.

When the transmission gear 42 rotates clockwise from the state shown in Figure 6, the rocking plate 41 rotates counterclockwise centered on the pin C through the cylinder 42a moving in the guide groove 41a, so it is in the rotation The pin B at the front end moves the tape running direction changing plate 40 in the direction indicated by the arrow G.

On the lower surface of the base plate 39, the flywheel 19 installed on the vertical guide shaft 3b, the pinion 20 (drive gear) integral with this flywheel 19, the missing tooth part 21a facing the first missing tooth part 21a and this pinion 20 The toothed gear 21 and the transmission gear 42 at the position facing the second missing tooth portion 21 b of the missing tooth gear 21 are rotatably supported on the base plate 39 .

On the outer periphery of flywheel 19, endless endless belt is hung, and when motor 2 was turned towards the direction of rotation, the direction of rotation of flywheel 19 was also converted according to the direction of rotation of the motor. On the above-mentioned vertical guide shaft 3b, a starting gear 23 with a smaller diameter than the pinion 20 is set above the pinion 20 and can freely rotate through a sliding rotation transmission mechanism. On the tooth-missing gear 21, a large-diameter gear 21c that usually meshes with the starter gear 23, and a toothed portion 21d formed between the first and second tooth-missing portions 21a, 21b smaller in diameter than the large-diameter gear 21c are integrally formed. , and the circular arc groove 21e into which the brake lever 1c protrudingly arranged under the base plate is inserted.

The arc angle of the arc groove 21e is such that when the first and second tooth-missing portions 21a, 21b face the pinion 20, the brake lever 1c contacts the ends 21k, 21m of the arc groove.

The transmission gear 42 is provided with a column 42a, which is inserted through the arc hole 39b opened on the base plate 39 when the transmission gear 42 is installed on the base plate, and protrudes on the upper surface side of the base plate. The circular arc angle of the arc hole 39b of the base plate 39 is made into a position where the transmission gear 42 rotates half a circle or slightly less than half a circle by the rotation of the toothless gear by meshing with the toothed part of the toothless gear. Above, the cylinder 42a is in contact with the terminal ends 39c, 39d of the arc holes.

FIG. 7 shows with a vector that when the tape running direction switching plate 40 of FIG. 6 is at the mobile terminal in the direction of arrow D, the reaction force of the tape running direction switching plate 40 is transmitted to the transmission gear 42 through the rocking plate 41.

The reaction force F of the tape running direction changeover plate 40 acts on the pin B in the direction of the arrow G, so that the rocking plate 41 tends to rotate counterclockwise with the pin C as the center. The force f in the vertical direction of 41b presses the column 42a fitted in the guide groove 41a.

At this time, the vector of the force f is farther to the left than the line connecting the center O of the cylinder 42a and the center P of the transmission gear 42, and the vector of the component force t of the force f is on the left side of the line connecting the center O of the cylinder 42a and the center P of the transmission gear 42. In the direction perpendicular to the line of P, the column 42a faces to the left in FIG. 7 .

As a result, the component force t acting on the cylinder 42a will make the transmission gear 42 rotate counterclockwise, but, as shown in Figure 6, the terminal 39d of the cylinder 42a and the arc hole 39b of the base plate 39 joins, counterclockwise Rotation of direction is blocked.

Therefore, the transmission gear 42 can be kept in the direction tending to continue to rotate by the reaction force of the running direction changing plate 40 . When the transmission gear 42 is held in a state of tending to continue to rotate, the running direction switching plate 40 is maintained at one or the other of the moving terminal positions by the reaction force acting thereon.

In the third embodiment, by setting the reaction force of the tape running direction conversion plate 40 to make the transmission gear 42 continue to move toward the pressing mechanism to continue to rotate, even if the transmission gear 42 rotates slightly less than half a turn, the tape can be rotated. The orientation switch pad 40 remains in one or the other mobile terminal position.

In the third embodiment, the shaking plate 41 is rotated, but its rotation range is within the range of the tooth top inner circumference of the transmission gear 42; due to the configuration on the transmission gear 42, the configuration of the shaking plate 41 to other components In addition, since the rocking plate 41 is rotated by the rotational force of the transmission gear 42, sufficient rotational force can be obtained.

Furthermore, as the pressing action mechanism explained in the first embodiment, an inclined surface 18b may be formed in the guide hole 18 of the tape running direction changing plate 10.

The automatic reversing device of the tape recorder of the present invention uses the conversion of the rotation direction of the motor to convert the tape running direction conversion mechanism of the tape running direction. The conversion controls the meshing between the toothless gear and the drive gear, and the rotation of the toothless gear drives the transmission gear to rotate at least half a circle, thereby making the tape running direction conversion plate linked with the transmission gear move to one side or the other, and convert the recording tape. In order to switch the running direction, there is no need to use a member that revolves to change the running direction, so the space occupied by the running direction changing device can be reduced, and the operation is stable.

Claims (3)

1. An automatic turning device of a tape recorder, which is provided with a pair of capstan wheels (3a, 3b), a pair of tape reel shafts (8a, 8b) and a pair of pinch rollers (4a, 4b); Plates (10, 30), which move linearly to one side or the other, so that a pair of pinch pulleys (4a, 4b) are selectively crimped on corresponding respective capstan pulleys (3a, 3b); and a motor (2), can be used for positive and negative rotation, to drive the reel shaft (8a, 8b) on the tape take-up side and the tape travel direction conversion plate (10, 30); when the tape travel direction conversion plate (10, 30) is in the When the terminal position is moved, the reaction force of the crimping force of the pinch pulleys (4a, 4b) and the capstan pulleys (3a, 3b) acts on the tape running direction conversion plate (10, 30) in the direction of back pressure, and is characterized in that, The unit also features: a drive gear (20) driven in rotation by said motor; The transmission gear (22) is free to reciprocate in a certain angle range, and engages with the belt running direction conversion plate (10, 30) to move the conversion plate (10, 30) to one side or the other; The missing gear (21) has a pair of missing teeth (21a, 21b), which can be rotated back and forth within 180°, and at the end position of the rotation, each missing tooth (21a, 21b) is simultaneously connected with the driving gear (20 ) and the transmission gear (22) are opposite, and outside the rotation terminal position, each toothed part (21d) between the two tooth-missing parts (21a, 21b) is meshed with the drive gear (20) and the transmission gear (22) at the same time ; The portion of the running direction changing plate (10, 30) connected to the transmission gear (22) is made into such a slope (18b, 31d), when the moving direction changing plate (10, 30) is at the terminal position of movement , then the transmission gear (22) is squeezed on the rotation terminal position; The starting gear (23) accepts the rotational force of the motor (2), and presses the missing tooth gear to the rotation terminal position. With the reverse rotation of the motor (2), each toothed part (21d) of the missing tooth gear (21) is simultaneously connected with the The driving gear (20) and the transmission gear (22) mesh, and the rotational force of the motor (2) is transmitted to the tape running direction through the driving gear (20), the tooth-missing gear (21) and the transmission gear (22). On the conversion plate (10, 30), a pair of pinch rollers (4a, 4b) are used for clutch switching of each capstan (3a, 3b). 2. The device according to claim 1, characterized in that a stop portion (1b, 1d) for limiting the rotation angle of said transmission gear (22) is formed on the base plate (1) of the recorder. 3. The apparatus of claim 1, wherein a stop portion (31c) for limiting the rotation angle of said transmission gear (22) is formed on said running direction switching plate (30).

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