JPS5862854A - Device for executing running of magnetic tape by inverting to left and right in reproducing mode - Google Patents

Abstract

PURPOSE:To obtain a satisfactory reproducing tone quality, by mechanically detecting a forward turn and a reverse turn of 2 capstans, and controlling necessary attachment and detachment of a pinch roller and a capstan by its detecting output. CONSTITUTION:Each motor 28a, 28b for directly driving supporting shafts 12, 12a by making capstans 10, 10a rotary shafts is turned forwardly and reversely by changeover switches 29a, 29b, and when reproduction of one magnetic track of a magnetic tape 7 has ended, a detecting signal is generated. By this detecting signal, the forward and reverse turn operation is executed, the motors 28a, 28b are turned forwardly, subsequently are turned reversely, and after that, are turned forwardly, and this operation is repeated. At the time of a forward turn of the motors 28a, 28b, a pinch roller 1 of the capstan 10 is made to press- contact, the tape 7 is fed to the left, the pinch roller 1 is detached from the capstan 10 through forward turn driving force of the motor 28b and is held, and at the time of a reverse turn by the motor 28b, the tape 7 is fed to the right.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for reversing the running of a magnetic tape left and right in a magnetic recording/reproducing machine using an auto-reverse type cassette.

In particular, it is applied to this type of direct drive type equipment, which has two capstans, two sets of pinch rollers that approach and separate from each other, and two capstans that are the rotating shafts of two DC motors. It is an object of the invention to obtain an effective technical means. A dual capstan system is one method for improving the sound quality played by magnetic recording/playback devices, but although this method is effective in improving sound quality, it has the disadvantage of being difficult and expensive to mass produce. , cannot be adopted as a general technology. In particular, it is nearly impossible to employ this method in an auto-reverse device. Therefore, in the known auto-reverse device, when the pinch roller is in pressure contact with the left capstan, the magnetic tape runs to the left, and at this time the right capstan and pinch roller are separated. Further, when the magnetic tape is caused to run rightward, the left capstan and the pinch roller are separated from each other, and the pinch roller is brought into pressure contact with the right capstan.

As understood from the above operation, the pinch roller is alternately brought into contact with and separated from the capstan. Since the pressing force of the 1-inch roller against the capstan exceeds 300 grams, an electromagnetic plunger with a large input is currently required for this operation. Such an electromagnetic plunger requires a temporary but large input, is large and expensive, and has the drawbacks of generating an impact noise.

The device of the present invention is characterized by eliminating the above-mentioned drawbacks, mechanically detecting the forward and reverse rotation of the two capstans, and controlling the new approach and separation between the pinch roller and the capstan using the detection output. It has the following.

Next, the features of the above-described apparatus of the present invention will be explained with reference to the embodiments shown in FIG. 1 and below.

An auto-reverse device is a technology that includes means for detecting the end of a tape, reversing the running direction of a magnetic tape, and switching between upper and lower tracks of a magnetic head. Therefore, explanations of other technologies will be omitted.

In FIG. 1, a magnetic head 7a is fixed on a support base (not shown) supported by the main body so as to be close to or apart from a cassette (not shown) to be mounted. Also, it is set up on a support stand, and the support shafts 3.3aK are connected to the levers 2 and 3aK, respectively.
．． 2a is rotatably supported and resiliently contacted in the directions of arrows A and B by a spring (not shown). Lever 2.
A pinch roller 1.1a is rotatably supported at the roadside portion 2a by support shafts 1b and 1c. Therefore, arrow A
, B, the pinch rollers 1.1a are configured to clamp and press the magnetic tape 7 against the capstans 10, 10jL, respectively. Reference numeral 8 denotes a tape pad whose both ends are fixed to the center of a leaf spring 8a supported on the bottom surface of the cassette. Although the attached cassette is not shown, the magnetic tape 7 is guided to the front side of the cassette by guide rollers 6.6a and runs to the left or right. When moving leftward, the capstan 10 rotates in the direction of the arrow (counterclockwise), and the capstan 10 and the pinch roller 1 are in pressure contact.

Also, the capstan 10a and the pinch roller 1a are spaced apart. The reproduction output of the recording on the upper stage of the magnetic tape is obtained from the magnetic head 7a. Further, the magnetic tape is wound up by a take-up reel via a guide roller 6 on the left side. Such well-known devices are omitted and not shown.

When the capstan 10a is rotating in the clockwise direction of the arrow, the pinch roller 1a is pressed against the capstan 10a, and the capstan 10 and the pinch roller l are separated from each other. Therefore, the magnetic tape 7 travels to the right, and the reproduction output of the recording on the lower stage of the magnetic tape is obtained from the magnetic head 7a.

At this time, the magnetic tape 7 passing through the guide roller 6a is
It is wound by a feed reel that is driven clockwise. Such means may be any known means and is therefore omitted from illustration.

An auto-reverse device can be obtained by detecting that the entire magnetic tape has been wound onto one reel, obtaining a tape end detection signal, and reversing the running of the magnetic tape as described above. be. For this purpose, of course, means for switching the upper and lower outputs of the magnetic head based on the tape end detection signal, means for changing the rotation direction of the winding and feeding reels, etc. are required, but these are not related to the gist of the present invention, so they will be omitted. be. There are also mode switching means such as fast forwarding and rewinding, but these are also omitted and not shown.

Next, the control means for moving the pinch roller 1.1a, which is the gist of the present invention, will be explained.

The details of the dotted lines 15, 13, 14, 12 in FIG. 1 are shown in FIG. 2 with the same symbols.

The rotating shaft 12 is supported by a shaft bearing (not shown), and a gear 15 is fixed to the rotating shaft 12. A gear 11 fixed to the capstan 10 meshes with the gear 15. Also, a rotating cam 14 is an eccentric roller clutch (
It is driven by a rotating shaft 12 via a one-way clutch (13). As shown in FIG. 2, the roller 17 is interposed between the cam surface of the cam plate 16 and the rotating shaft 12, so when the gear 15 rotates in the direction of arrow C, the roller clutch 13 also rotates in the same direction. However, when rotating in the opposite direction, the rotating shaft 12 only freely rotates (slides) with respect to the rotating cam 14.

When the capstan 10 is rotating counterclockwise, the gear 15 rotates clockwise, so the rotating cam 14
is not receiving any driving torque. However, a spiral spring (not shown) is applied between the rotating cam 14 and the main body, and a clockwise torque is applied to the rotating cam 14 due to the resiliency of the spring. The protruding portion 14b rotates in the same direction as it rotates 120 times, and its rotation is inhibited by a planting bin (retarding member) 18 provided on the main body, and the protruding portion 14b is stopped at the position shown in the figure. However, the sliding bin 5 installed at Z4 is slightly spaced apart at the position of the minimum deflection point of the rotating cam 14.

The lever 4 is configured to protrude from the right end of the lever 2'. The lever 2 holds the pinch roller 1 and has two upper and lower parts, and the lever -4 is the one that protrudes from the right end of the lower lever.The upper and lower levers of the lever 2 are indicated by the symbol 2b. It is constructed by bending the parts into a U-shape and pressing them.

The above state is the reproduction mode in which the magnetic tape 7 runs to the left. At this time, a load is applied to the capstan 10 due to the idle rotation of the gears 11 and 15, but the load is extremely small and does not affect the quality of reproduced sound.

The capstans 10.10a are of a direct drive type, each serving as a rotating shaft of a separate semiconductor motor. When the magnetic tape is completely wound onto one reel by the take-up reel, a detection signal is obtained by a tape end detection device using known means. Since this detection signal is inputted from the terminal 36a in FIG. 4(b), the output of the flip-flop circuit 36 is inverted, increasing the pace voltage of the transistor 30 and making it non-conductive.

Since transistors 30 and 31 are inverting circuits,
Transistor 31 becomes conductive. Also, transistors 32 and 3
3 is a flip-flop circuit, so when the transistor 31 is conductive, the transistor 32 is conductive, and
Also, the transistor 33 becomes non-conductive. In this state, the output voltages of the terminals 34a and 34b are such that the terminal 34b has a positive voltage and the terminal 34a has a negative voltage. Note: Symbol 27aX27b
are the positive and negative terminals of the power supply. When the transistor 30 becomes conductive, the conduction and non-conduction of each transistor are reversed, so that the polarity of the terminals 34a134b is also reversed. That is, the terminal 36a
Each time there is an input voltage, the positive and negative outputs of the terminals 34aX34b are alternated. This voltage becomes the voltage applied to the Hall element which is the position detection element of each of the two semiconductor motors described above. Since the voltage applied to the Hall element is reversed every time there is a manual pulse to terminal 36L,
Both the semiconductor motor rotates forward and reverse repeatedly.

As mentioned above, when the electric motor is reversed by the tape end detection signal, the capstan shown in FIG. 1 is activated. Also, the rotating shaft 12
(shown in the second figure) also rotates in the same direction, so the rotary cam 14 also rotates in the direction of arrow C via the roller clutch 13. Therefore, the sliding bin 5 installed on the reno ζ-4 is moved by the rotating cam 14.
is moved in the direction of arrow G. If the sliding pin 5 is a roller, the friction loss of the above-mentioned operation can be reduced. Due to the above-mentioned movement of Leno (-4), lever 2 (shown in the first diagram) also rotates counterclockwise.
The pinch roller is the cab.

Separate from Stan 10. The rotating cam 14 in Fig. 2 is □I
I.

After half a rotation, the protrusion 14b comes into contact with the sliding pin 5, so that rotation of the rotary cam 140 is inhibited. This position is when the maximum deflection point of the rotary cam 14 faces the sliding pin 5.

Lever 4a, gear 11a, gear 15a, rotating cam 14a1, roller clutch 13a, and rotating shaft 1 in FIG.
2a are a lever 4 and a gear 11.2a, respectively. These members correspond to the gear 15, the rotating cam 14, the roller clutch 13, and the rotating shaft 12. Therefore, their actions and effects are exactly the same.

The difference is the clutch action depending on the rotational direction of the roller clutch 13a. When the rotating shaft 12a1 gear 15a rotates in the counterclockwise direction of the arrow, the roller clutch 1
3 a slides and does not transmit power V). However, when the rotation is in the opposite direction (clockwise), the rotating cam 14a is also rotated in the same direction via the roller clutch 13a.

In the above-mentioned rotation, the rotating cam 14a is rotated counterclockwise due to the elastic force of the spiral spring applied between the rotating cam 14a and the main body. At a position where the minimum deflection point of the rotating cam 13a faces the sliding pin 5a of the lever 4a, a restraining member having exactly the same structure as the protrusion 14b and the abutment pin 18 shown in FIG. Similarly to the above case, the above-mentioned spring is stored so that its rotation is inhibited when the maximum deflection point is at the position facing the sliding bin 5aK. The position shown in Figure 1 is the above-mentioned position,
The lever 4a is pressed and the pinch roller l& is spaced apart from the capstan 10a.

As mentioned above, since the capstan 10 is reversed, the carburetor methane 10a is also reversed (clockwise). Therefore, since the gear 15& also rotates in the direction of the arrow, that is, in the counterclockwise direction, the roller clutch 13a is sliding. However, the rotating cam 14a springs back due to the action of the spring described above, and its rotation is inhibited at a point where the minimum deflection point is opposite the sliding pin 5aK. At this time, the lever 4a+lever 2m rotates counterclockwise and is brought into pressure contact with the pinch roller 1aFi and capstan 10a, causing the magnetic tape 7 to run to the right. At this time, the reproduction output of the magnetic head 7a is based on the recording band of the lower magnetic track of the magnetic tape.

Next, the operation of the pinch roller 11a when the magnetic tape is running in either the left or right direction and being reproduced will be explained in more detail. For example, when traveling to the right, that is, when the pinch roller a is
A case will be explained in which the pinch roller is in pressure contact with the capstan 10 and the pinch roller is spaced apart from the capstan 10.

In such a case, as shown in FIG. 2, the rotary cam 14 rotates half a turn in the direction of arrow C, and the protrusion 14b comes into contact with the sliding pin 5, thereby inhibiting its rotation.

As described above, the semiconductor motor having the capstan 10 as its rotation axis is rotated in forward and reverse directions by the control circuit shown in FIG. Also, as shown in FIG. 4(C), the resistor 35a
Control is performed by a parallel circuit of one electric switch 35. Symbol 37 indicates a device including a semiconductor motor, a position sensing element, and an armature current control circuit.

In FIG. 2, when the rotary cam 14 rotates half a turn in the direction of arrow C and the protrusion 14b comes into contact with the sliding pin 5, the protrusion 14b first contacts the actuator 35b of the microswitch blade. 3 and press the actuator to open the microswitch 35. This electric switch is 1. Since they are indicated by the same symbols in FIG. 4(C), the armature current flows through the resistor 35a and decreases.

The output torque due to this current may be sufficient as long as it is sufficient to maintain the rotating cam 14 shown in FIG. 2 so as not to spring back. Therefore, it continues to be energized during playback,
Moreover, although the semiconductor motor is stopped, there is no problem in practical use. The actual amount of current supplied is about 30 to 50 milliamps. When the running direction of the magnetic tape is reversed to the left, the capstan 10, 10 & is also reversed. Therefore, gear 15 rotates clockwise. Along with this rotation, the rotating cam 14 also receives the spring release, and the protruding portion 14b
The rotary cam 14 stops when it comes into contact with the abutment bottle 18, and the gear 15 is freely rotating thereafter1.At this time, the lever 4 moves in the opposite direction to the arrow G. The pinch roller 1 is pressed against the capstan 10. At this time, the device that controls the pinch roller 1a, the lever 2a, and the lever 4a also operates, but this configuration is exactly the same as the device that controls the pinch roller 1, lever 2, and lever 4, as described above. Therefore, the lever 4a is pressed by half a rotation of the rotary cam 14a, and the pinch roller 1
a is spaced apart from the capstan 10a.

As can be understood from the above explanation, the capstans 10 and 10a, each of which is directly driven by a semiconductor motor, receive an end detection electric signal obtained from the tape end detection device from the terminal 36a in FIG. 4(b). Each time the rotation direction is input, the rotation direction is simultaneously reversed in the forward and reverse directions. Along with this, the running direction of the magnetic tape is also reversed. When the magnetic tape begins to travel to the left in FIG. , via lever 2, pinch roller 1
is pressed against the capstan 10. At the same time, rotating cam 1
4 a also half turn clockwise) Lever 4a, Lever 2a
The pinch roller 1a connects to the capstan 10a via
They are kept at a distance. When the capstans 10 and 10a turn clockwise in response to the tape end detection signal, the rotary cam 14 rotates half a turn counterclockwise, presses the L/bar 4 and the lever 2, and moves the pinch roller 1 to the capstan 10. Keep them further apart. At the same time, the rotating cam 14
a also rotates half a turn counterclockwise, and the sliding pin 5 of the lever 4a
a is a position opposite to the minimum deflection point of the rotating cam 14a, and the pinch roller 1a is pressed against the capstan 10a.

As described above, the pinch rollers 1 and 1a automatically come into contact with and separate from the corresponding capstans by reversing the capstan 10.1 oa in the forward and reverse directions, thereby enabling the pinch rollers 1 and 1a to move left and right on the magnetic 7-f. be.

Therefore, it can be applied to auto-reverse devices to provide an effective technical means□.

If the motor that directly drives the Nakayapstan θ%10a is a well-known commutator motor, it is necessary to reverse the applied voltage in order to reverse the motor. An embodiment for this purpose is shown in FIG. 4(a). Changeover switch 29a1
29b is in the illustrated state, the negative voltage power supply terminal 27b is energized from the positive voltage power supply terminal 27a via the changeover switch 29a1, motor 28a, 28J changeover switch 29b, and each motor is rotating in the normal direction. A mechanical output is obtained by a well-known mechanical tape end detection device, and the positive and negative voltages applied to the motors 28a and 28b can be reversed by simultaneously switching the changeover switches 29a and 29b. Therefore, forward and reverse rotation can be performed, so
It is possible to implement the present invention.

In the embodiment shown in FIG. 3, the pinch roller 1 and the capstan 10 are brought into contact with and separated from each other by rotating the capstan 10 in the forward and reverse directions. Components with the same symbols as those in the previous embodiment are the same members and have the same functions, so a description thereof will be omitted.

A gear 22 is fixed to the capstan 10, and a lever 20 is rotatably fitted with friction.

A gear 21 is rotatably supported at the free end of the lever and meshes with gear 4. The support shaft 24 provided on the main body has
A gear 23 and a rotary cam 5, which are integrally formed, are supported. When the capstan 1o rotates clockwise, the lever 20 also rotates in the same direction, so the gear 21 meshes with the gear 23. Since gear 21 rotates in the direction of arrow E, it drives gear 23 in the direction of arrow F. Therefore, since the gears 21 and 23 touch each other at the biting angle, power transmission is ensured.

Symbols 20a and 20b are abutment pins provided on the main body, which are used to prevent left and right rotation of the lever.

As the capstan 10 rotates in the direction of the arrow, the gear blade is also rotated in the same direction, so the lever 4 and the lever 211m move in the direction of the arrow H via the sliding pin 5 that slides on the outer periphery of the rotating force table 25. be done. Therefore, the pinch roller 1 is spaced apart from the capstan 10. The rotating cam 5 rotates half a rotation,
When the maximum deflection point 111 is in the position facing the lever 4, the abutment pin 18, which is provided on the main body, passes through the toothless notch 23a and reaches 23b.
The gear 230 is prevented from rotating. At the same time, the actuator 35b of the microswitch 35 is pressed to open it, thereby opening the electric switch with the same symbol in FIG. 4(C). Therefore, the gear 23 presses the abutment pin 18 by the torque generated by the energization through the resistor 35a, and is maintained in that state. Further, when the capstan 1o is rotated in the opposite direction to the arrow, the lever 20 is also rotated in the same direction, so the gear 21 is separated from the gear 23, and the lever 20 comes into contact with the abutting pin 20b and stops. A spiral spring is applied between the gear 23 and the main body, and since the gear 23 is elastically contacted in a counterclockwise direction, it springs back and the abutment pin 18 comes into contact with the end of the notch 23a. Stop at the position. This position is the rotary cam 25
Since the minimum deflection point of is at the position opposite to the lever 4, the lever 4.2 returns and the pinch roller 1 moves to the capstan 1.
The magnetic tape 7 is pressed to an angle of .degree., and the magnetic tape 7 starts running to the left.

It is also possible to use a rubber idler instead of the gears 22, 21, 23. A device having exactly the same configuration as in FIG. 3 is driven by a capstan 10a (shown in the first diagram) K to control the contact and separation of the pinch roller 1a and the capstan 10a. In this case, when the capstan 10a rotates clockwise, the pinch roller 1a comes into pressure contact with the capstan 10a, and when the capstan 10a rotates counterclockwise, the pinch roller 1a is held apart from the capstan 10a. control is being carried out.

The control of the pinch roller 1.1a described above is as shown in FIGS. 1 and 2.
Since this is exactly the same as the case shown in the figure, the object of the present invention can be achieved. The one-way clutch (roller clutch) 13.13a in FIG. 1 does not necessarily refer to the gear 15.1.
5 a (It is not necessary to provide it on the D rotation axis 12.12a,
For example, capstan 10110 a and gear "l, lla"
The same purpose can be achieved even if each is provided between the two.

As is clear from the description of each of the embodiments above, the objects of the present invention have been achieved and the effects are significant.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the device of the present invention, FIG. 2 is an explanatory diagram of a rotating cam, which is also a part of the device, FIG. 3 is an explanatory diagram of another embodiment of the present invention, and FIG. Control circuit diagrams of the capstan motors are shown. 1.1a - pinch roller, 2.2a, 2b. 2 d・Lever, lb, lc, 3.3a, 21・
・Spindle, 4.4a... Lever, 7a... Magnetic head, 8... Butt, 8a... Leaf spring, 6.6a... Guide roller, 5.5a... Sliding pin , 12.12 a... Support shaft, 13.13a...
Roller clutch, 14.14 a-...Rotating cam,
15.15a111.11 a - Gear, 7...
・Magnetic tape, 35...Micro switch, 35b
・Actuator, 17...Roller, 16...
Cam plate, 14 b... Projection, 18.20 a
, 20 bl, contact bottle, 20... lever,
21.22.23... Gears, 27a, 27b...
Power supply voltage negative electrode, 28a, 28b...-DC motor, 3
5 a...Resistor □',' 29aX29b...Selector switch, 36...Flip-flop circuit, 30.
31, 32. 33...Transistor, 37...Semiconductor motor. Figure 2

Claims (3)

[Claims] (1) By the first and second two capstans and the first and second pinch rollers that come into contact with and separate from these capstans,
In a magnetic recording and reproducing device that selectively runs a magnetic tape in the left and right directions and automatically and continuously reproduces the upper and lower magnetic tracks, the first and second capstans are directly driven as rotating shafts, respectively. a forward/reverse device that rotates the first and second electric motors in forward and reverse directions; and a tape end detector that generates a detection signal when reproduction of one magnetic track of a magnetic tape is completed. Based on the detection signal obtained from the device and the carcass detection device, the above-mentioned forward/reverse device is operated to cause the first and second electric motors to simultaneously rotate forward, then reverse, and then return to normal rotation. When the repeating device and the first and second electric motors rotate forward, the first pinch roller is pressed against the first capstan driven by the first electric motor, and the magnetic tape is moved to the left. an eleventh capstan;
When the second electric motor is in reverse rotation, the first pinch roller is held apart from the first capstan through the reverse driving force of the first electric motor, and the second pinch roller is driven by the second electric motor. In the reproduction mode, the second pinch roller is pressed against the second capstan, and the running of the magnetic tape is reversed left and right. device to carry out. (2) In the scope of the claims set forth in paragraph (1),
The first capstan is a reduction gear that is decelerated by meshing with a fixed gear, and a gear provided on the rotating shaft of the gear that slides when the first capstan rotates in the forward direction and provides power when the first capstan rotates in the reverse direction. A one-way clutch through which transmission is carried out, a rotary cam driven through the one-way clutch, and when the first capstan is reversed, the aforementioned rotary cam is rotated against the elastic force of a spring. , which rotates from its minimum deflection point to its maximum deflection point, whose rotation is stopped by a restraining member provided on the main body, and which is maintained in this state by the driving torque of a first capstan; of the member in contact with the cam surface of the rotating cam due to the above-mentioned rotation of the cam,
A device for holding the first pinch roller apart from the first capstan through movement of the rotating cam until the point of maximum excursion is reached; and when the first capstan returns to normal rotation, the rotation The cam also springs back due to the elastic force of the spring, and the member in contact with the cam surface becomes
When the rotary cam returns to the position of the minimum deflection point, the rotary cam is decelerated by meshing with a restraining member provided on the main body to restrain rotation of the rotary cam and a gear fixed to the second capstan. A gear, a one-way clutch that is provided on the rotating shaft of the gear and slides when the second capstan rotates in the reverse direction and transmits power when the second capstan rotates in the forward direction, and a rotating cam that is driven via the one-way clutch. When the second capstan rotates normally, the above-described rotating cam is rotated against the elastic force of the spring, and rotates from its minimum deflection point to its maximum deflection point, and the restraining member provided on the main body is rotated. , the rotation of the rotary cam is stopped and the state is maintained by the drive torque of the second capstan, and the maximum deflection of the rotary cam of the member in contact with the cam surface of the rotary cam due to the above-mentioned rotation of the rotary cam. Move through the second until you reach the point
a device for holding the pinch roller apart from the second capstan, and when the second capstan returns to reverse rotation;
The rotating cam also springs back due to the elastic force of the spring described above, and when the member in contact with the cam surface returns to the position of the minimum deflection point of the rotating cam, the main body is configured to suppress the rotation of the rotating cam. What is claimed is: 1. A device for reversing the running of a magnetic tape from side to side in a playback mode, characterized by comprising a restraining member provided therein. (3) In the scope of the claims set forth in paragraph (1), the first
a gear fixed to the capstan; a first lever frictionally coupled to the first capstan and rotatably supported about the first capstan; and a free end of the lever. a floating gear rotatably supported by a support shaft on the main body and meshing with the gear; a first main gear rotatably supported by a support shaft provided on the main body; and a first main gear. When the stun rotates in the normal direction, the first lever also rotates in the same direction, causing the idle gear to idle, and when in reverse, the first lever rotates in the same direction, causing the idle gear to bite into the first main gear at an angle. When the meshing device, the rotating cam integrally formed with the first main gear, and the first capstan are reversed, the rotating cam is rotated against the elastic force of the spring, and the rotating cam is rotated against the elastic force of the spring. A device that rotates from a minimum deflection point to a maximum deflection point, whose rotation is stopped by a restraining member provided on the main body, and maintains this state by the driving torque of a first capstan, and a rotating cam as described above. A device for holding a first pinch roller apart from a first capstan through movement of a member in contact with a cam surface of the rotating cam until the rotating cam reaches a maximum deflection point due to rotation; When the stun returns to normal rotation, the rotating cam is also spring-backed by the spring described above, and when the member in contact with the cam surface returns to the position of the minimum deflection point of the rotating cam, rotation of the rotating cam is inhibited. A restraining member provided on the main body, a gear fixed to the second capstan, frictionally coupled to the second capstan, and rotatably supported with the second capstan as a pivot. a second lever rotatably supported by a spindle at the free end of the lever, a floating gear that meshes with the gear mentioned above, and a spindle provided on the main body. When the second main gear and the second capstan rotate in reverse, the second lever also rotates in the same direction, causing the idle gear to idle, and during normal rotation, the second lever rotates in the same direction. The floating gear has a device that meshes with the second main gear at a biting angle, a rotating cam that is integrated with the second main gear, and a second main gear.
When the capstan rotates in the forward direction, the above-mentioned rotating cam is rotated against the elastic contact force of the spring, and rotates from its minimum deflection point to its maximum deflection point, and a restraining member provided on the main body prevents the rotation. is stopped and maintained in that state by the drive torque of the second capstan, and the member in contact with the cam surface of the rotary cam is moved by the aforementioned rotation of the rotary cam until the rotary cam reaches the maximum deflection point. When the second capstan returns to reverse rotation, the rotating cam is also spring-backed by the above-mentioned spring, and the above-mentioned cam is In the regeneration mode, the magnetic material is A device that reverses the running of the tape from side to side.