JPS624783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to simplify the configuration by switching a pair of pinch rollers toward and away from the capstan shaft without using a special drive source.
This invention relates to an auto-reverse device for a reel-type tape recorder.

Conventionally, most auto-reverse devices have been configured to use an electromagnetic plunger to switch a pair of pinch rollers toward and away from a capstan shaft. The plunger must be strong because the pinch roller must be pulled away from the capstan shaft against the pressure applied to the capstan shaft, which poses a problem in reducing the overall size of the tape recorder. Another disadvantage was that the plunger needed to be large and required a large amount of current to drive it. Furthermore, the switching mechanism for selectively rotating the pair of reel shafts has a complicated structure, which inevitably increases the size of the tape recorder as a whole.

The present invention was made based on the above circumstances, and its purpose is to mechanically detect a change in the rotational direction of a motor that rotationally drives a capstan shaft in an auto-reverse device for a two-reel tape recorder. The transmission path of the rotational force of this motor is switched from one reel shaft side to the other reel shaft side, and at the same time, the rotational force of the motor is used to switch the pair of pinch rollers toward and away from each capstan shaft. In this way, the purpose is to simplify and downsize the configuration.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below based on embodiments shown in the drawings.

First, the embodiment shown in FIGS. 1 to 6 will be described. A pair of reel shafts 2A, 2B and a pair of capstan shafts 3A, 3B are rotatably attached to the upper surface of the substrate 1, respectively. Each reel axis 2
A and 2B are equipped with operating gears 4A and 4B as operating rotary bodies at the lower positions so as to rotate together,
Further, a drive rotating body 5 is rotatably mounted on the upper surface of the substrate 1 at a position equidistant from both operating gears 4A and 4B. The drive rotary body 5 is composed of two integrated drive gears 6 and 7, large and small, and is supported by a single shaft 5A with the large gear 6 facing upward. A pin 8 as an engaging portion is provided on the upper surface of the large gear 6, and a center portion of a rotating member 9 is rotatably supported on the upper end of the shaft 5A, and one end of the rotating member 9 An intermediate gear 10 serving as an intermediate rotating body is rotatably mounted on the intermediate gear 10 . This intermediate gear 10 is always meshed with the large diameter drive gear 6. The rotating member 9 is biased in the same direction as the rotating direction of the driving gear 6 by the rotational force of the driving gear 6, and is designed to mesh the intermediate gear 10 with either one of the operating gears 4A or 4B. A transmission gear 11 that meshes with a large-diameter drive gear 6 is rotatably mounted on the substrate 1. Further, the shaft 11A of the gear 11 protrudes toward the back side of the substrate 1, and a pulley 12 is attached to this protruding end.

At each lower end of the capstan shafts 3A and 3B,
Pulleys 13A and 13B functioning as flywheels are attached to the back side of the substrate 1.
In the figure, reference numeral 14 denotes a motor capable of forward and reverse rotation for rotationally driving both capstan shafts 3A and 3B. An endless belt 16 is wrapped around the belt, and both capstan shafts 3A and 3B are driven to rotate in the same direction as the motor 14, and the transmission gear 11 is driven to rotate in the opposite direction to the motor 14. 17 in the diagram
A and 17B are pinch rollers provided corresponding to the capstan shafts 3A and 3B, respectively, and pinch arms 18A and 18B that pivotally support these are connected to the shaft 19.
It is attached on the board 1 via A and 19B. Each pinch arm 18A, 18B is connected to a pinch roller 17A, 17 by a spring (not shown).
It is always urged to rotate in one direction so as to press the capstan shafts 3A and 3B into contact with each other. Further, a switching lever 21 is connected to the upper surface of the board 1 via a shaft 20 provided at a position equidistant from both capstan shafts 3A and 3B.
is rotatably mounted. This switching lever 2
Reference numeral 1 has pressing pins 22A and 22B located near the rotation ends of the pinch arms 18A and 18B, and when the pinch arms 18A and 18B rotate clockwise in FIG. The pinch roller 17A is separated from the capstan shaft 3A by pressing in the biasing direction, and when rotating in the opposite direction, the pinch arm 18B is pressed in the opposite biasing direction with the other pressing pin 22B to separate the pinch roller 17B from the capstan shaft 3B. It is configured to be separated further. In addition, at another location on the board 1 there is an L-shaped rotating lever 2.
3 is rotatably pivoted via a shaft 23A, and one end of this rotating lever 23 is connected to one end of the switching lever 21 via a connecting lever 24. Note that the other end of the rotating lever 23 has a bifurcated engaging portion 2.
5 is provided. In the figure, 26A and 26B are stoppers that restrict the rotation range of the rotary lever 23, and the rotary lever 23 is stably held by coming into contact with either one of the stoppers 26A or 26B by a toggle spring 27. ing. The switching lever 21, the rotating lever 23, and the connecting lever 24 constitute a pinch roller switching mechanism 28, in which the rotating lever 23 is connected to one stopper 26 as shown in FIG.
When it is on the A side, one pinch roller 17A is in pressure contact with the capstan shaft 3A, and the rotation lever 2
3 rotates toward the other stopper 26B as shown in FIG.
The capstan shaft 3A is pressed by the pressure pin 22A of 1.
The pinch roller 17B is pulled away from the other pinch roller 17B at the same time.
comes into pressure contact with the capstan shaft 3B. Further, the connection lever 24 is provided with a switch operation section 24A.

In the figure, reference numeral 29 denotes an L-shaped head mounting plate that is slidably mounted on the board 1, and a magnetic head 30 is mounted on one side of this mounting plate 29 at a position equidistant from both capstan shafts 3A and 3B. It is guided by the shafts 19B, 20, etc., and slides in the left and right directions in FIG. Further, each pinch arm 18 is provided on the upper surface of the head mounting plate 29.
Press pins 31A and 31B are placed near A and 18B.
are provided, and when the pinch arm 18 moves to the right in FIG.
Press the rotating ends of A and 18B to release each pinch arm 1.
7A, 17B to their respective capstan shafts 3A,
It is configured to be separated from 3B. A tension spring 32 is suspended between the head mounting plate 29 and the base plate 1, and the mounting plate 29 is always biased toward the left in FIG. 1 by the spring 32. Further, an arcuate cam surface 33 is formed at the other end of the mounting plate 29.

In the figure, reference numeral 34 denotes a polarity reversal switch for changing the polarity of the head terminal of the magnetic head 30. The switching button 34A of this switch 34 engages with the switch operating portion 24A of the connecting lever 24, and the pinch roller switching mechanism 28 When the pinch rollers 17A, 17B are switched toward and away from the capstan shafts 3A, 3B, the switch 34 is operated simultaneously.

An elongated plate-shaped transmission member 35 is attached to the upper surface of the substrate 1 so as to be slidable in the longitudinal direction (vertical direction in FIG. 1). This transmission member 35 has guide pins 37 inserted into long holes 36A and 36B provided at both ends.
A, 37B are inserted into the long holes 36A, 36B.
It is designed to be able to slide within the range of , and has a rack 38 and a protrusion 39 on one side,
Further, the upper surface has a pair of engagement pins 40A, 40B and an operation pin 41. The transmission member 35 has a rack 38 meshed with the small gear 7 of the driving rotary body 5 as appropriate, but is normally stably held at the uppermost position or the lowermost position in FIG. 1 by the toggle spring 42 and is not rotated. It is not engaged with the body 5.

In the figure, reference numeral 43 denotes an engaging member that constitutes a transmission mechanism 44 together with the transmission member 35, and this member 43 is connected to the shaft 4.
One end is pivotally connected to the upper surface of the substrate 1 via the pin 3A. Further, the engagement member 43 is provided with a long hole 45,
An engagement pin 46 attached to the rotating member 9 is inserted into the elongated hole 45 to interlock with the rotating member 9. Furthermore, the engagement member 43 is connected to the transmission member 3.
It is located between both engaging pins 40A and 40B on the pin 8, and in particular, its rotating end extends to the upper surface side of the drive rotary body 5 (the upper surface side of the large gear 6) and is appropriately positioned on the rotational trajectory of the pin 8. It is now located in

47 in the figure is a fast-forward operation lever, and this lever 4
7 is attached to the upper surface of the substrate 1 so as to be slidable vertically in FIG. 1, and is normally held at the lowest position shown in FIG. 1 by a tension spring 48. The upper surface of the fast-forward operation lever 47 has a cam pin 49 and a locking pin 50 on the upper surface.
The position of the magnetic head 30 is regulated by bringing the cam surface 33 of the head mounting plate 29 into pressure contact with the elastic force of a spring 32. Therefore, when the operating lever 47 is pushed in the vertical direction in FIG. It will now be moved backwards to the right in the figure. Further, a hook 51 made of a leaf spring is rotatably mounted on the upper surface of the board 1 between the fast-forward operation lever 47 and the transmission member 35.
As shown in FIG. 6, this hook 51 is constantly pressed against the top surface of the board 1 by a coil spring 53 wound around a pivot shaft 52, and is biased clockwise to lock the locking pin of the fast-forward operating lever 47. The right edge is brought into contact with 50. A locking recess 54 for holding the fast-forward operation lever 47 in the pushed-in position is provided on the right side edge of the hook 51.
A cam-like projection 55 is provided at the front position of 4. Furthermore, release pieces 56 and 57 are provided at a position adjacent to the left side of the recess 54 and a position adjacent to the right side of the cam-shaped protrusion 55, respectively, and are cut and raised diagonally upward.
A release cam 58 that protrudes downward in a V-shape is provided on the left side edge of 1. The release cam 58 is located on the path of the protrusion 39 provided on the transmission member 35, so that when the transmission member 35 moves upward or downward, it slides into contact with the protrusion 39 and deflects upward. It's getting old. When the hook 51 is bent upward while the locking pin 50 is held in the locking recess 54 as shown by the imaginary line in FIG. is restored by the spring 48.

Next, the operation of this auto-reverse device will be explained. First, the mounting plate 29 is moved to the right in FIG. 1 by operating a stop operation lever (not shown), and in this state, tape cassettes (not shown) are set on both reel shafts 2A, 2B. When a playback or recording operation is performed, the head mounting plate 29 moves to the left in the figure to bring the magnetic head 30 into contact with the magnetic tape in the cassette, and the motor 14 rotates counterclockwise as shown in FIG. The rotational force of the motor 14 is transmitted to the drive rotating body 5 via the pulley 12 and the transmission gear 11. Therefore, intermediate gear 10
receives the rotational force of the large gear 6 and revolves counterclockwise and meshes with one operating gear 4A, and at the same time rotates clockwise and rotationally drives one reel shaft 2A counterclockwise. Further, at this time, the transmission member 35 is held at the lowest position in the figure as shown in FIG.
As a result, one pinch roller 17A connects to the capstan shaft 3A via the magnetic tape in the cassette.
The other pinch roller 17B is pressed against the capstan shaft 3 by the pressing pin 22B of the switching lever 21.
Separated from B. The rotational force of the motor 14 is transmitted to both capstan shafts 3A and 3B via pulleys 13A and 13B, respectively, and both capstan shafts 3A and 3B rotate counterclockwise, so that the magnetic tape in the cassette is transferred to the capstan shaft 3.
The recording medium travels at a speed regulated by A, and is wound onto one of the take-up reels set on the reel shaft 2A, during which a predetermined playback or recording operation is performed.

When the tape in the cassette is pulled out from the supply reel to its end in this manner, the end of the tape is detected by special means, and the direction of rotation of the motor 14 is thereby switched. The end of the tape can be detected either mechanically, which detects a sudden change in tape tension and activates a certain member, or electrically detects a conductive foil added after the end of the tape and outputs an electrical signal. Since various electrical methods are known, a detailed description thereof will not be given here.

When the rotational direction of the motor 14 is switched, the rotational direction of the driving rotary body 5 is also changed accordingly, and the rotating member 9 rotates in the same direction as the driving rotary body 5 (clockwise) as shown in FIG. to separate the intermediate gear 10 from one operating gear 4A. Furthermore, the engagement member 43 is driven counterclockwise by the rotational force of the rotation member 9. Although the rotational force of the rotation member 9 in this case is not so large, since no load is initially acting on the engagement member 43, it can be moved lightly with an extremely small force. The rotating end of the engaging member 43 is connected to a pin 8 provided on the large gear 6.
3, the pin 8 strongly rotates the engagement member 43 counterclockwise due to the rotational force of the drive rotor 5, and the engagement is completed. The member 43 presses one engagement pin 40A of the transmission member 35 to move the transmission member 35 in the direction of the arrow in FIG.
is brought into mesh with the small gear 7. Thereafter, the engagement member 43 is removed from the rotational orbit of the pin 8, but the transmission member 35 is further moved in the same direction due to the engagement between the small gear 7 and the rack 38, and the operating pin 41 moves the rotation lever 23 clockwise. It is rotated and stably held at the uppermost position shown in FIG. 4 by the toggle spring 42. Further, the intermediate gear 10 meshes with the other operating gear 4B to transmit the rotational force of the drive rotary body 5 to the reel shaft 2B. On the other hand, the rotational force of the rotating lever 23 is transmitted to the switching lever 21 via the connecting lever 24, and the switch 34 is switched by the movement of the connecting lever 24.
At the same time, one pinch roller 17A is separated from the capstan shaft 3A by the rotation of the switching lever 21, and the other pinch roller 17A is separated from the capstan shaft 3A.
B comes into pressure contact with the capstan shaft 3B via the magnetic tape. Therefore, the magnetic tape in the cassette is driven by the other capstan shaft 3B and travels in the opposite direction, and is sequentially wound onto the reel on the reel shaft 2B side for reproduction or recording.

In this way, even when the magnetic tape is pulled out from the reel on the reel shaft 2A side to the end, the tape running direction is switched in the same way, and operations such as playback and recording continue.

Next, for example, when the motor 14 is rotating counterclockwise as shown in FIG. 1 and an operation such as playback or recording is being performed, the fast forward operation lever 47 is pushed in as shown in FIG. 5 and the locking pin 50 is hooked. 51 locking recess 5
4, the cam pin 49 provided on the lever 47 presses the cam surface 33 of the head mounting plate 29, pushing the head mounting plate 29 back toward the right in the figure against the spring 32. become.
Therefore, the magnetic head 30 attached to the mounting plate 29 is separated from the magnetic tape in the cassette, and at the same time both pinch arms 18A, 18B are also pushed back by the pressing pins 31A, 31B provided on the mounting plate 29, and the pinch rollers 17A, 18B are pushed back. 17B to each capstan shaft 3
Pull away from A and 3B. As a result, the magnetic tape is no longer restricted by the capstan shaft 3A, so that it can be wound at high speed by the rotation of the reel shaft 2A.

When all of the magnetic tape is wound onto one reel in this manner, the direction of rotation of the motor 14 is switched as before, and the rotating member 9 is rotated. Then, the intermediate gear 10 is separated from one operating gear 4A and meshed with the other operating gear 4B, and at the same time, the rotational force of the driving rotary body 5 is transmitted to the transmission member 35 via the engagement member 43. , and further operates the pinch roller switching mechanism 28 via the transmission member 35. At this time, the protruding piece 39 of the transmission member 35 presses the release cam 58 of the hook 51 and bends the hook 51 upward.
The locking pin 50 is disengaged from the hook 51, and the fast-forward operating lever 47 is returned to its initial position by the spring 48. Therefore, the head mounting plate 29 also has spring 3.
2 returns to the initial position and brings the magnetic head 30 into contact with the magnetic tape, and the pinch roller 1
7B is pressed against the capstan shaft 3B, the shape shown in Fig. 4 is reproduced, the magnetic tape runs at a speed regulated by the capstan shaft 3B, and the magnetic tape is wound on the reel on the reel shaft 2B side for playback or recording. The action begins to take place.

As described above based on the embodiments, the auto-reverse device of the present invention switches the rotational direction of the driving rotary body 5 according to the switching of the rotational direction of the motor 14, and also rotates the rotating member 9. First, the engaging member 43 is moved to a position where it engages with the engaging portion (pin 8) provided on the driving rotary body 5 by the small rotating force of the rotating member 9, and the engaging member 43
is displaced by a certain amount in response to the rotational force of the drive rotor 5, the transmission member 35 is moved to a position where it engages with the drive rotor 5 in conjunction with the engagement member 43, and the rotational force of the drive rotor 5 is reduced. The transmission member 35 is strongly driven, and the transmission member 35 also operates the pinch roller switching mechanism 28 to switch the pinch rollers 17A, 17B.
The capstan shaft 3 is configured to move toward and away from the capstan shafts 3A and 3B.
The pinch rollers 17A and 17B can be switched by using the motor 14 that drives the pinch rollers A and 3B, and the configuration can be simplified. Furthermore, since the conventional electromagnetic plunger is not required, power consumption can be reduced and the entire tape recorder can be made smaller.

Note that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways. For example, in FIGS. 7 and 8, the large gear 6 of the drive rotor 5 is connected to the rotating end of the engaging member 59.
An example is shown in which an arc-shaped tooth portion 60 that meshes with is provided, and the pin 8 of the large gear 6 is omitted (the same parts as in the previous embodiment are given the same reference numerals). Even with such a configuration, the engaging member 59 is first rotated by the rotational force of the rotating member 9 to a position where it meshes with the large gear 6 as shown in FIG.
The engaging member 53 is strongly rotated by the rotational force of
The transmission member 35 can be moved in the direction of the arrow through the engagement member 59 to the position where it meshes with the small gear 7 as shown in FIG. be able to.
Further, instead of the transmission member 35 that moves linearly, a transmission member 61 that moves rotationally as shown in FIG. 9 may be used.

In the embodiment shown in FIG. 9, the same parts as in the embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals. Furthermore, it is also possible to configure the drive rotating body 5 with a single gear, and it is also possible to replace all the gear parts with friction transmission mechanisms. Further, by connecting the driving rotor and the rotating member via a friction transmission mechanism, the rotating force of the rotating member can be increased. Furthermore, the transmission mechanism 44 may also be constructed from a single component. Furthermore, the transmission mechanism is directly driven by the rotating body 5.
Instead of being driven by the transmission gear 11, the transmission gear 11 may be used instead.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being a plan view, Figures 2 to 5 being a plan view showing only the parts necessary for explaining the operation, and Figure 6 being a partial perspective view. 7 to 8 are partial plan views showing another embodiment, and FIG. 9 is a partial plan view showing still another embodiment. 2A, 2B... Reel shaft, 3A, 3B... Capstan shaft, 4A, 4B... Operating gear (operating rotating body),
5... Drive rotating body, 8... Pin (engaging portion), 9... Rotating member, 10... Intermediate gear (intermediate rotating body), 14... Motor, 17A, 17B... Pinch roller, 28... Pinch roller first switching mechanism, 30...Magnetic head, 35
...transmission member, 43...engaging member.

Claims (1)

[Scope of Claims] 1. A pair of reel shafts provided to integrally rotate an operating rotary body, a magnetic head, a pair of capstan shafts disposed on both sides of the magnetic head, and a pair of capstan shafts corresponding to each capstan shaft. a pair of pinch rollers which are provided in the same direction and alternately press against the corresponding capstan shafts; a motor which can rotate forward and backward to drive both of the capstan shafts; a pinch roller switching mechanism that switches both pinch rollers toward and away from the capstan shaft; a drive rotating body that has an engaging portion in a part and is rotationally driven by the motor; an intermediate rotating body that selectively engages with one of the operating rotating bodies to transmit the rotational force of the driving rotating body to the operating rotating body; It is urged in the same direction as the rotational direction of this driving rotary body by the rotational force, and rotates when the rotational direction of the motor is switched, separating the intermediate rotary body from one operating rotary body and operating the other. a rotating member that engages with the rotating body; and an engaging member that is normally in a position where it does not engage with the driving rotating body and moves to a position where it engages with the engaging portion of the driving rotating body by the rotational force of the rotating member. , while this engaging member engages with the engaging portion and is displaced by a certain amount in response to the rotational force of the driving rotating body, the engaging member moves in conjunction with the engaging member to a position where it engages with the driving rotating body, and then An auto-reverse two-reel tape recorder comprising a transmission member driven by the driving rotary body to actuate the pinch roller switching mechanism and switch both pinch rollers toward and away from their corresponding capstan shafts. Device. 2. The auto-reverse device for a two-reel tape recorder as set forth in claim 1, wherein the operating rotary body, the drive rotary body, and the intermediate rotary body are gears.