KR900002584Y1 - Auto-reverse device of tape recorder - Google Patents

Abstract

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Description

Tape recorder autoreverse mechanism

Fig. 1 is a plan view of an autoreverse mechanism in a roll wound with a tape showing the chassis of a tape recorder on a left reel stand.

2 is a plan view of the tape recorder in the state of FIG.

3 is a sectional side view of the main part of the cam gear and the intermediate gear.

4 is another cross-sectional side view.

5 is a plan view of the head substrate, the stop lever and the actual stop plate.

6 is a rolled state of FIG. 1, in which the solid line shows the sliding state of the eccentric cam and the sensor plate when the scroll operation stops, and the dashed-dotted line shows the engagement state of the engaging portion and the sensor plate.

7 is a plan view of a state where the cam gear is driven toward the reel stand on the right side so that the tape is wound on the reel stand on the right side.

* Explanation of symbols for main parts of the drawings

3: cam gear 3b: eccentric cam

3d: engaging part 4: slide plate

10: conversion lever 19, 20: capstan shaft

23: motor 30, 31: reel replacement

34: middle gear 35, 36: sensor plate

40, 41: Pinch roller α: farthest position

The present invention relates to an autoreverse mechanism of a tape recorder for reproducing by sending a tape in an electrostatic and reverse rotation direction.

In the conventional automatic reverse tape recorder, the electrostatic driving and the reverse driving conversion are carried out by supplying the reel stage, the reel side reel stage, and the motor for driving the capstan shaft. Through conversion, it is driven by a dedicated motor, or it is converted by inverting an inverting plate with a plunger.

Therefore, it is difficult to miniaturize because the cost increases and occupies space, and the use of a motor or a plunger requires a large battery capacity, which makes it impossible to manufacture a portable small tape recorder.

The present invention, in view of the above-described drawbacks, the sensor plate for detecting the end of the tape and the engagement of the gear to drive the cam gear to slide the slide plate without a separate motor or plunger The automatic reverse mechanism of the tape recorder which can switch the sending direction of the sine, and does not occupy a space, which is simple, cost-down, and can be downsized, and is easily downsized.

The present invention integrates the eccentric cam and the eccentric cam, the cam tooth with the engaging portion at the outermost position of the eccentric cam, a pair of reel counters, one reel counter, and the other pliers engaged with the other reel counters. A sensor plate alternately sliding on the eccentric cam, a conversion lever that supports the cam gear to rotate freely and swings freely, and a slide plate that converts the pressure between the pinch roller and the capstan shaft by swinging the conversion lever; And a stop of the reel on the reel side by means of a sensor plate, and the cam tooth is electrically driven by sliding the slide plate by engaging the sensor plate with the engaging portion.

Next, the present invention will be described according to one embodiment as shown.

FIG. 1 shows the state in which the tape is wound to the left, and the autoreverse mechanism of the tape recorder has a conversion lever 10 at the center of the lower surface of the chassis 1 in FIGS. The small center gear 2 rotates freely by the support shaft 11 so as to slide and move.

On the lower side of the end of the conversion lever 10, the cam gear 3 and the smaller gear 13 than the cam gear are rotated by the support shaft 12. As in the above, the friction plate 14 is coupled to the friction plate 14 such as felt and the plate spring 15.

The cam gear 3 is meshed with the small gear 2a of the center gear 2. The front of the conversion lever 10 protrudes from the long hole 1a on the chassis 1, and the pin 16 is fixed at the end thereof. Shape It is caught by the part 4a.

A dead point spring 17 is attached between the forearm protruding from one side of the conversion lever 10 and the chassis 1.

The slide plate 4 is mounted on the chassis 1 so that the slide plate 4 can slide freely from side to side, and the head board 5 is placed on the slide plate 4 so that the three bent portions of the chassis 1 In 1b), the vibrations of the left and right sides are regulated so that they are left to slide freely before and after, and at the same time, they are added directly to the spring 18.

On the back of the chassis 1, the synthetic resin substrate 6 is fixed as shown in the dashed-dotted line and the fourth figure in FIG. 1, and both capstan shafts 19 and 20 are embedded in the substrate 6, respectively. For example, when the capstan shaft 19 is the forward rotation side and the capstan shaft 20 is the reverse rotation width, the fly-only fly foil 21 and the fly-back fly foil 22 are fixed to the motor 23. Rotation through the belt (24), the capstan shaft (20) is fixed to the pinion (25) integrally with the fleece and the idler (26) installed between the center gear (2) is engaged. The rotation of the capstan shaft 20 is transmitted to the cam gear 3.

In front of both capstan shafts (19) and (20), a pair of reel shafts (27) and (28) are arranged to be supported by the bearing (29) on the chassis (1), and the reel counterbalance on both reel shafts ( 30) and 31 are fixed, and the intermediate gear 34 that is driven by the support shaft 32 and restrained by the E-ring 33 is engaged with the reel gear 30 on the reel shaft 27. .

When the taper is wound on the reel axle 27 by the gear 13 being electrically engaged with the reel tooth 31 and the intermediate gear 34, the reel axle 27 rotates clockwise in the clockwise direction. The reel shaft 28 is rotated counterclockwise.

The sensor plate 35 is a spring 37 in the intermediate gear 34, and the sensor plate 36 is a spring 39 in the claw portion 38 fixed to the upper end of the reel shaft 28. ), And the intermediate gear 34 is combined with the friction.

The capstan shafts 19 and 20 are arranged such that the pinch rollers 40 and 41 are alternately pressed to contact each other, as shown in FIG. 2, and the pinch rollers 40 and 41 are arms fixed to the shaft. (7) (7 ') are supported so as to be freely rotated by the support shafts 42 and 42, respectively, to the capstan shaft with the springs 43 fitted into the bent portions 1c and 1c of the chassis 1. In addition, downward projections 7a and 7a of both arms 7 and 7 'face the inclined surfaces 4b and 4c of the slide plate 4, respectively.

In the center of the upper surface of the cam gear 3 An eccentric cap 3b is formed as a protrusion in the part 3a, and a protruding chimney 3c is formed around the periphery, respectively, and the furthest position α of the eccentric cap 3b is opposite to the eccentric cap 3b. On the line connecting the center of the support shaft 12 and laterally pressed at the same distance from the furthest position from the support shaft 12 Shaped engaging portions 3d are formed, and pins 44 and 45 fixed to the front ends of the sensor plates 35 and 36 face downward. The pin 44 is slid in contact with the eccentric cam 3b while the tape 44 is inserted in the section 3a and the tape is wound on the reel shaft 27. The pin 45 is in sliding contact with the inner circumferential surface of the protrusion 3c. It is supposed to be.

While the reel shaft 28 winds the tape, the pin 44 is in sliding contact with the inner circumferential surface of the protruding stack 3c, and the pin 45 is in sliding contact with the eccentric cam 3b.

The left side of the slide plate 4 extends and the slide switch 46 is fixed on the chassis 1. The mold engaging portion 4e is formed.

The magnetic head 47 is fixed on the head substrate 5 so that the slide switch 46 can be converted to correspond to the delivery to the left and the right of the tape, and the head substrate 5 is forwardly bent 5a. ) Is protruded to be regenerated by directly pressing the bent portion 5a so that the head substrate 5 is advanced.

The back surface of the board | substrate 6 is provided so that the locking plate 8 shown by the solid line in FIG. 5 may slide to the left and right at will, and it is added to the left side by the spring (not shown).

The locking plate 8 is formed to be inclined so that the bent piece 5b of the head substrate 5 is fastened to the locking portion 8a, and the other locking portions 8b, 8c,... A bent piece of an operation lever, such as a fast-feedback, which is not shown in the figure, is hung, and a release part 8d formed of an inclined surface is formed again, and the bent part 9a of the stop operation lever 9 is in contact.

In the operation of the autolip mechanism, a tape set 48 having a tape end fixed to a reel hub is loaded on the reel shafts 27 and 28, and the bent portion 5e of the head substrate 5 is pushed forward. The paper cutout surface 5b is caught by the locking portion 8a of the locking plate 8, and a switch (not shown) is closed to rotate the motor 23 in the counterclockwise direction.

By this rotation, the rotation of the reverse rotation-only fry foil 22 is transmitted to the cam gear 3 through the pinion 25, the idler car 26, and the center gear 2 of the capstan shaft 20, and at the same time, the first In the state in which the tape is wound to the reel shaft 27 on the left side, the gear 13 is engaged with the intermediate gear 34 and transmitted to the reel tooth 30 of the reel shaft 27 in a clockwise rotation. Since the slide plate 4 is moved to the right side and the arm 7 is pushed up by the spring 43, the protrusion 7a does not come into contact with the inclined surface 4b. The tape is pressed by the tape, and the fry foil 21 for exclusive use is rotated clockwise to be set to the forward running state.

At this time, the pin 44 of the sensor plate 35 is slid and slid around the eccentric cam 3b.

In this state, the pinch roller 41 is separated from the capstan shaft 20 because the protrusion 7a of the other arm 7 'is pushed forward on the inclined surface 4c.

Next, when the rotation of the reel shaft 27 stops at the end of the tape, the rotation of the intermediate gear 34 is stopped, so that the pin 44 of the sensor plate 35 moves to the cam gear 3 that is continuing to rotate. As shown in the solid line in FIG. 3, the cam is pushed to the furthest position α of the eccentric cam 3b and stopped. When the cam gear 3 is rotated again, the cam gear 3 is rotated toward the reel shaft 28 while being engaged with the small gear 2a of the center gear 2, as shown by the dashed line. As in the solid line, the counterbalance 913 and the reel counterbalance 31 of the reel axle 28 are engaged.

At this time, the switching lever 10 in which the cam gear 3 is held as the shaft in the support shaft 12 is rotated about the support shaft 11 so that the slide plate 4 slides to the left on the pin 16. The pinch roller 41 is pressed against the capstan shaft 20 because the projection 7a does not come into contact with the inclined surface 4c even when the other arm 7 'is pushed up by the spring 43. The head 47 is converted to the slide switch 46, and the rotation of the centrifugal wheel 2 is automatically converted to the reel shaft 28 so that the tape is wound toward the reel shaft 28 as a reverse rotational running state.

In this state, the center plate 36 swings because the pin 45 slides around the eccentric cam 3b.

When the tape is wound in the state in which the tape of FIG. 7 is wound around the reel shaft, the reel shaft 31 of the reel shaft 28 stops rotating, so that the pin 450 of the center plate 36 is rotated by the eccentric cam 3b. When the cam gear 3 is rotated by 180 °, the engaging portion 3d is pressed against the pin 45, and the cam gear 3 is rotated again. 3) is engaged with the small gear 2a toward the reel shaft 27 so as to be in the same state as in FIG. 1, and the gear 13 is engaged with the intermediate gear 34. As shown in FIG.

At this time, the switching lever 10 is rotated so that the slide plate 4 is slid to the right side from the pin 16, the pinch roller 40 is pressed by the capstan shaft 19 by pressing the tape. The magnetic head 47 is converted by the slide switch 46.

When the auto reverse mechanism is stopped, as shown in FIG. 5, when the stop lever 9 is pushed in, the bent portion 9a comes into contact with the release portion 8d of the stop plate 9, and the stop plate 8 Moved to the right, the bent piece 5a of the head substrate 5 is released from the locking portion 8a and stopped.

Although not shown separately, the automatic stop mechanism may be incorporated to automatically stop when the A and B surfaces of the tape cassette 48 are reproduced.

As described above, when the autoreverse mechanism is configured, the conversion for winding the tape to one reel shaft 27 and the other to the reel shaft 28 is an eccentric cam of the cam gear 3. The cam gear car 93 is made to be transmitted by the locking portion 3d with the 3b and the sensor plates 35 and 36 which detect the stop of the winding reel engaged with the locking portion 3d. Since it does not require other motors or plungers, cost can be reduced and battery power can be reduced, and tape recorders can be made smaller and lighter.

In the above description, the magnetic head 47 for converting the magnetic head into the slide switch has been described. However, the rotary magnetic head rotated by the movement of the slide plate 4 may be provided to mechanically convert the traveling and the reverse rotating driving. . In addition, the magnetic head may not only be a playhead, but also a record head, a play head, and an erase head may be provided for recording and reproduction.

The present invention, as described above, the winding of the tape to one side of the reel axis, and the conversion of the winding to the other side of the reel axis, the eccentric cam and the engaging portion of the cam gear, and the winding reel to fit the engaging portion This is achieved by the motorized motor with a sensor plate that detects the stoppage of the motor and does not require other motors or plungers. Therefore, cost reduction can be achieved, and battery power can be reduced, tape recorders can be miniaturized, and lightweight. It can provide an excellent effect.

Claims (1)

A tape recorder having a gear transmission mechanism for alternately transmitting rotations of capstan shafts 19 and 20 driven by a motor 23 to a pair of reel gears 30 and 31, wherein the tape recorder is provided in the gear transmission mechanism. In addition to the eccentric cam 36, the cam gear 3 with the locking part 3d0 at the furthest position of the eccentric cam, and the intermediate gear 2 engaged with one reel tooth and the other reel tooth, Sensor plates (35, 36) alternately sliding on the eccentric cam, a conversion lever (10) installed to support the cam gear to rotate freely and to swing freely, and the pinch roller and the capstan shaft And a slide plate 4 for converting the pressing contact of the sensor, and detecting the stop of the reel to be wound by the sensor plates 35 and 36, and the cam tooth is driven by the engagement between the sensor plate and the engaging portion 3d. Of the tape recorder made by sliding the slide plate (4). Tori bus bodies.