JPH0610515Y2 - Automatic recorder mechanism of tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an auto-reverse mechanism for a tape recorder that feeds a tape in a forward or reverse direction for reproduction.

[Prior art]

The conventional auto-reverse type tape recorder can be switched between normal rotation and reverse rotation by reversing when the reel side reel stand is detected in addition to the motor that drives the supply side reel stand, take up side reel stand and capstan shaft. The roller that reverses the plate is switched by driving it with a dedicated motor via a speed reduction mechanism, or the reverse plate is reversed by a plunger and switched. Therefore, it is difficult to reduce the size because it increases the cost and occupies a space. When a motor or a plunger is used, a large battery capacity is required, and the size is increased, so that a portable small tape recorder cannot be manufactured.

[Purpose of device]

In view of the above drawbacks, the present invention rolls the cam gear by the engagement of the sensor plate for detecting the end of the tape and the engaging portion of the cam gear, and slides the slide plate to remove the tape without a separate motor or plunger. It is an object of the present invention to propose an auto-reverse mechanism for a tape recorder, which can change the feeding direction of the tape recorder, requires no space, has a simple structure, can reduce costs, and can be easily downsized.

[Constitution of device]

According to the present invention, an eccentric cam driven by a motor, a cam gear having an engaging portion at an outermost position of the eccentric cam, a pair of reel base gears, an intermediate gear meshing with one reel base gear and the other reel base gear. Sensor plates frictionally coupled to the gears and slidingly contacting the eccentric cams alternately, a switching lever rotatably supporting the cam gears and swingably provided, and a pinch roller by the swinging of the switching levers. And a slide plate for switching the pressure contact between the capstan shaft and the capstan shaft, the sensor plate detects the stop of the take-up reel, and the sensor plate and the engaging portion are engaged to rotate the cam gear. By converting the power into the rotative power of the cam gear and swinging the switching lever, the slide plate is slid to switch the pressure contact between the pinch roller and the capstan shaft. Lies in the fact was.

〔Example〕

Hereinafter, the present invention will be described with reference to an illustrated embodiment. FIG. 1 shows a state in which the tape is wound to the left side. The auto-reverse mechanism of the tape recorder is such that, in FIGS. 1 to 4, a switching lever 10 is swingably supported by a spindle 11 at the center of the lower surface of the chassis 1. The large and small center gears 2 on the support shaft 11 below the switching lever 10.
Is rotatably supported. On the lower side of the tip side of the switching lever 10, there is a support shaft 12 with a cam gear 3 and a large gear smaller than the cam gear.
13, the cam gear 3 and the large gear 13 are frictionally coupled to each other by a friction plate 14 such as felt and a plate spring 15 as shown in FIG. The cam gear 3 is meshed with the small gear 2a of the center gear 2. The front side of the switching lever 10 is projected from the long hole 1a on the chassis 1 and the pin 16 is fixed to the end thereof, and the pin is engaged with the U-shaped recess 4a of the slide plate 4. A dead point spring 17 is stretched between the arm branched from one side of the switching lever 10 and the chassis 1. The slide plate 4 is placed on the chassis 1 and supported so as to be slidable left and right, and the head substrate 5 is placed on the slide plate 4, and the left and right swings are restricted by the three bent portions 1b of the chassis 1. It is slidably held back and forth and is biased to the front side by a spring 18.

A synthetic resin substrate 6 is fixed to the back surface of the chassis 1 as shown by the chain double-dashed line in FIG. 1 and in FIG. 4, and both capstan shafts 19 and 20 are supported on the substrate 6, and the capstan shaft 19 is temporarily assumed.
When the capstan shaft 20 is set to the forward rotation side and the capstan shaft 20 is set to the reverse rotation side, the forward rotation flywheel 21 and the reverse rotation flywheel 22 are fixed and rotated by the motor 23 via the belt 24, and the capstan shaft 20 is integrated with the pulley. The pinion 25 is fixed and the idler gear 26 provided between the pinion 25 and the center gear 2 is fitted, and the rotation of the capstan shaft 20 is transmitted to the cam gear 3.

In front of the both capstan shafts 19 and 20, a pair of reel base shafts 27 and 28 are mounted on the chassis 1 by bearings 29, and reel base gears 30 and 31 are fixed to the reel base shafts.
The reel base gear 30 on the side is supported by a support shaft 32, and an E ring 33
The intermediate gear 34, which is prevented from slipping off by, is meshed. The reel gear 31 and the intermediate gear 34 mesh with the large gear 13 by the rotation of the cam gear 3, and when the tape is wound on the reel base shaft 27, the reel base shaft 27 is normally rotated in the clockwise direction. 28 is reversed counterclockwise.

Sensor plates 35 and 36 are placed on the upper surfaces of the intermediate gear 34 and the reel base gear 31 of the reel base shaft 28, and the sensor plate 35 is a spring 37 in the intermediate gear 34 and a sensor plate 36 as shown in FIG.
Are frictionally coupled to the reel base gear 31 and the intermediate gear 34 by springs 39 in claws 38 fixed to the upper end of the reel base shaft 28, respectively.

As shown in FIG. 2, pinch rollers 40 and 41 are arranged so as to be alternately pressed against the capstan shafts 19 and 20, and the arms 7 and 7'on which the pinch rollers 40 and 41 are supported are respectively support shafts. 42, 42 is rotatably supported, and the bent portion 1c of the chassis 1 is
It is urged to the capstan shaft side by the spring 43 fitted in 1c,
The downward projections 7a, 7a of both arms 7, 7'are faced with the inclined surfaces 4b and 4c of the slide plate 4, respectively.

At the center of the upper surface of the cam gear 3, an eccentric cam 3b is formed in a recess in a recess 3a, and a jetty 3c is formed in the periphery thereof. On the line connecting the centers of 12 and at the same dimension as the outermost position from the support shaft 12, a laterally-shaped engaging portion 3d is formed, and pins 44 and 45 fixed downward at the tips of the sensor plates 35 and 36. The pin 44 is slidably contacted with the eccentric cam 3b and the pin 45 is slidably contacted with the inner peripheral surface of the jetty 3c while the tape is wound in the recess 3a and the reel base shaft 27 winds the tape. While the reel base shaft 28 is winding the tape, the pin 44 is in sliding contact with the inner peripheral surface of the jetty 3c, and the pin 45 is in sliding contact with the eccentric cam 3b.

The left side of the slide plate 4 is extended to form an engagement recess 4e of a slide switch 46 fixed on the chassis 1.

A magnetic head 47 is fixed on the head substrate 5 and is switched by the slide switch 46 so as to correspond to the feeding of the tape to the left side and the feeding to the right side, and the head substrate 5 has a bent portion 5a on the front side. Is formed so as to project, and the head substrate 5 is moved forward by the reproduction operation by directly pressing the bent portion 5a.

On the back surface of the substrate 6, a locking plate 8 shown by a solid line in FIG.
Is slidably provided to the left and right and is biased to the left by a spring (not shown). The locking plate 8 is formed with a plurality of locking portions 8a, 8b, 8c, ... Each having an inclined surface and a hook portion, and the bent piece 5b of the head substrate 5 is locked to the locking portion 8a in a forward state. , Other locking parts
Bending pieces of an operation lever for fast-forwarding / rewinding, which are not shown, are locked to 8b, 8c, ..., Further, a releasing portion 8d formed of an inclined surface is formed so that the bending piece 9a of the stop operating lever 9 abuts. To be done.

The operation of the auto-reverse mechanism is that the reel base shafts 27 and 28 are loaded with the tape cassette 48 whose tape ends are fixed to the reel hub, and when the bent portion 5a of the head substrate 5 is pushed forward, the bent piece 5b is locked. The motor 23 is rotated counterclockwise by being locked by the locking portion 8a of the plate 8 and closing a switch (not shown). By this rotation, the rotation of the flywheel 22 for reverse rotation is transmitted to the cam gear 3 via the pinion 25, the idler gear 26 and the center gear 2 of the capstan shaft 20, and the tape is on the left reel spindle 27 side in FIG. In the state of being wound on the arm 7, the large gear 13 is meshed with the intermediate gear 34 and is transmitted as a clockwise rotation to the reel base gear 30 of the reel base shaft 27, and the slide plate 4 is moved to the right side. Even if the spring is pushed up by the spring 43, the protrusion 7a does not come into contact with the inclined surface 4b, so the pinch roller 40 is pressed against the capstan shaft 19 by pinching the tape, and the forward flywheel 21 is rotated clockwise to rotate forward. It is set to the running state. At this time, the pin 44 of the sensor plate 35 is slidably contacted around the eccentric cam 3b and swung.
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 by the inclined surface 4c.

Next, when the reel base shaft 27 stops rotating at the end of the tape,
Since the rotation of the intermediate gear 34 is stopped, the pin of the sensor plate 35
Reference numeral 44 denotes a cam gear 3 that continues to rotate, and is pushed to the outermost position α of the eccentric cam 3b as shown by the solid line in FIG. 6 to be in a stopped state. When the engagement portion 3d is pressed against the pin 44 as shown by the two-dot chain line in the figure and the cam gear 3 is further rotated, the cam gear 3 meshes with the small gear 2a of the center gear 2 as shown by the two-dot chain line. The large gear 13 is meshed with the reel base gear 31 of the reel base shaft 28 as shown by the solid line in FIG.

At this time, the switching lever 10 in which the cam gear 3 is supported by the support shaft 12 is rotated about the support shaft 11, the slide plate 4 is slid to the left by the pin 16, and the pinch roller 40 causes the protrusion 7a of the arm 7 to move. Is separated from the capstan shaft 19 by the inclined surface 4b and the pinch roller 41
Slopes 4c even if the other arm 7'is pushed up by the spring 43.
Since the protrusion 7a is not abutted against the tape, the tape is sandwiched and pressed against the capstan shaft 20, and the magnetic head 47 is slid onto the slide switch 46.
The rotation of the center gear 2 is automatically switched to the reel base shaft 28 side, and the tape is wound on the reel base shaft 28 side in the reverse running state. In this state, the pin 45 of the sensor plate 36 slidably contacts the periphery of the eccentric cam 3b and is swung.

When the tape shown in FIG. 7 reaches the end of the tape while it is wound on the reel base shaft 28 side, the rotation of the reel base gear 31 of the reel base shaft 28 is stopped, so that the pin 45 of the sensor plate 36 moves the pin 45 of the eccentric cam 3b.
Of the cam gear 3
Is rotated 180 °, the engaging portion 3d is pressed against the pin 45, and when the cam gear 3 is further rotated, the cam gear 3 is rolled on the reel base shaft 27 side while meshing with the small gear 2a. As shown in FIG. 1, the large gear 13 meshes with the intermediate gear 34.

At this time, the switching lever 10 is rotated and the pin 16 is used to slide the slide plate 4.
Is slid to the right, and the pinch roller 40 moves the capstan shaft 19
The tape is sandwiched between and pressed. The magnetic head 47 is switched by the slide switch 46.

When the automatic reverse mechanism is stopped, when the stop operating lever 9 is pushed in as shown in FIG.
9a is abutted, the locking plate 8 is moved to the right, and the bent piece 5a of the head substrate 5 is released from the locking portion 8a and stopped. In addition, a tape cassette that incorporates an automatic stop mechanism (not shown)
It may be configured to automatically stop when the A side and B side of 48 are reproduced.

When the automatic reverse mechanism is configured as described above, switching between winding the tape on one reel base shaft 27 side and winding the tape on the other reel base shaft 28 side is performed by switching the eccentric cam 3b of the cam gear 3.
The cam gear 3 is rolled by the engaging portion 3d and the sensor plates 35 and 36 for detecting the stop of the winding side reel engaged with the engaging portion 3d, which requires another motor or plunger. Since it does not, it is possible to reduce the cost, save the battery power, and reduce the size and weight of the tape recorder.

In the above description, the magnetic head 47 that switches the magnetic head with the slide switch has been described, but a rotary magnetic head that is rotated by the movement of the slide plate 4 may be provided to mechanically switch between normal rotation and reverse rotation. Further, the magnetic head is not limited to the reproducing head, but a recording head, a reproducing head and an erasing head may be provided for recording / reproducing.

[Effect of device]

As described above, according to the present invention, the tape is wound on one reel base shaft side and the other reel base shaft side is switched between the eccentric cam of the cam gear and the engaging portion, and this engaging portion is changed. The sensor plate that detects the stop of the reel on the take-up side is rolled by the cam gear and does not require any other motor or plunger. Therefore, the cost can be reduced and the labor saving of the battery power source and the tape can be achieved. It is possible to provide an auto-reverse mechanism for a tape recorder, which has practically excellent effects such as downsizing and weight saving of the recorder.

[Brief description of drawings]

An embodiment of the present invention is shown in the drawing, and FIG. 1 is a plan view of an auto-reverse mechanism during winding of a tape through a chassis of a tape recorder into a left reel, and FIG. 2 is a state of FIG. FIG. 3 is a plan view of the tape recorder in FIG. 3, FIG. 3 is a cross-sectional side view of the main parts of the cam gear and the intermediate gear, FIG. 4 is another cross-sectional side view, and FIG. FIG. 6 is a plan view showing the winding state of FIG. 1, the solid line shows the state where the winding is stopped and the eccentric cam is in sliding contact with the sensor plate, and the two-dot chain line shows the engagement state between the engaging portion and the sensor plate. Figure,
FIG. 7 is a plan view showing a state in which the cam gear is rolled to the right reel stand side and the tape is wound on the right reel stand side. 3 ... Cam gear, 3b ... Eccentric cam, 3d ... Engagement part, 4 ...
… Slide plate, 10 …… Switching lever, 19,20 …… Capstan shaft, 23 …… Motor, 30,31 …… Reel base gear, 34…
… Intermediate gear, 35,36 …… Sensor plate, 40,41 …… Pinch roller, α …… Outermost position.

Claims (1)

[Scope of utility model registration request] 1. An eccentric cam driven by a motor, a cam gear having an engaging portion at an outermost position of the eccentric cam, a pair of reel base gears, an intermediate gear meshing with one reel base gear, and the other reel. Sensor plates frictionally coupled to the base gears and slidingly contacting the eccentric cams alternately, a switching lever rotatably supporting the cam gears and swingably provided, and a pinch by swinging of the switching levers. A roller plate and a slide plate for switching the pressure contact between the capstan shaft, and detecting the stop of the take-up reel by the sensor plate, the sensor plate and the engagement portion is engaged by the cam gear By converting the turning force into the turning force of the cam gear or by swinging the switching lever by the turning force of the cam gear itself, the dead point spring engaged with the switching lever is operated, Causes energized to reel base gear side either the switching lever, Autry Bath mechanism of a tape recorder the slide plate is slid, characterized in that it has to switch the pressure between the pinch roller and the capstan shaft.