JPH0610516Y2 - Auto-river steer precoder auto-river mechanism - Google Patents

Description

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

[Prior art]

The applicant of the present invention slides the slide plate 5 by rolling the eccentric cam by engaging the two sensor plates 6 and 7 for detecting the end of the tape and the engaging portion 4e of the eccentric cam 4 as shown in FIG. We have proposed a portable auto-reverse tape recorder that saves power in a power supply battery that can switch the tape feed direction without a separate motor or plunger.In this tape recorder, tape is loaded on the reel stand and shown in the figure. When the tape is wound on the reel stand on the left side of the, the sensor plate is operated at the position indicated by the solid line, and good operation is performed. However, if the tape is not loaded, the inactive area indicated by the chain double-dashed line due to vibration. Since the sensor plate and the engaging portion are not engaged at this time, there is a disadvantage that the tape feeding direction cannot be switched and a malfunction occurs. The same applies when the tape is wound on the right reel stand.

[Purpose of device]

In view of the above-mentioned drawbacks, the present invention proposes an auto-reverse mechanism for an auto-reverse tape recorder that prevents malfunctions by preventing the sensor plate from moving from the operating area to the non-operating area due to vibration or the like.

[Constitution of device]

The present invention relates to an automatic reverse tape recorder in which modes are switched by an eccentric cam, a switching plate that rotatably supports the eccentric cam and can switch between a forward rotation direction and a reverse rotation side in the tape running direction, and a rotation direction opposite to the rotation direction of the reel stand. A first sensor plate that is rotationally biased in a direction, a second sensor plate that is rotationally biased in a direction opposite to the rotational direction of the reel base, and first and second pressed portions that are provided on both sensor plates, respectively. , A first and second pressing portion provided on the switching plate, and presses the second pressed portion of the second sensor plate with the second pressing portion in the forward transfer state or the first in the reverse feed state. This is because the first pressed portion of the sensor plate was pressed by the first pressing portion, and the sensor plate on the supply reel base side was pressed and displaced to a position outside the rotation range with the switching engaging portion.

〔Example〕

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows a state in which the tape is wound to the right side. The auto-reverse mechanism of the auto-reverse tape recorder is shown in FIG.
A switching plate 2 is swingably supported by a long hole and a support shaft 10 in the center of the lower surface of the center shaft 3, and large and small center gears 3 are mounted on the support shaft 10 below the switching plate 2.
Is rotatably supported. An eccentric cam 4 and a large gear 12 smaller than the outer diameter of the eccentric cam are supported by a support shaft 11 below the front side of the switching plate 2. Between the eccentric cam 4 and the large gear 12, there is a friction plate such as felt (not shown). Friction coupled with leaf springs. A gear 4a engraved on the outer circumference of the eccentric cam 4 meshes with the small gear 3a of the center gear 3.

The arm portion 2a on the front side of the switching plate 2 is projected on a long hole (not shown) on the chassis 1 to form a concave portion 2b at the end, and the convex portion 5a of the slide plate 5 is engaged with the concave portion 2b. In FIGS. 1 and 2, a dead point spring 13 is stretched between the arm 2c branched from the front right side of the switching plate 2 and the chassis 1.
A first pressing portion 2e is formed on the arm portion 2c. Switching plate 2
Further, an arm portion 2d is further provided on the left side, and a second pressing portion 2f is formed by a bent portion formed at the tip of the arm portion 2d. The slide plate 5 is placed on the chassis 1 and supported so as to be slidable right and left, and a head substrate (not shown) is placed on the slide plate 5.

Both capstan shafts 14 and 15 are provided in a protruding manner on the upper surface of the chassis 1, and when the right capstan shaft 14 is the forward rotation side and the left capstan shaft 15 is the reverse rotation side, the forward flywheel 16 and the reverse rotation are used. Each flywheel 17 is fixed to a capstan shaft and rotated by a motor 18 via a belt 19, and a pinion 20 integrated with a pulley is fixed to the capstan shaft 15 and is provided between the center gear 3. The idler gear 21 is meshed, and the rotation of the capstan shaft 15 is transmitted to the eccentric cam 4.

In front of the both capstan shafts 14 and 15, a pair of reel base shafts 22 and 23 are bearing mounted on the chassis 1 by bearings, and reel base gears 24 and 25 are fixed to both reel base shafts. An intermediate gear 27, which is supported by a support shaft 26, is meshed with the reel base gear 24. The large gear 12 is meshed with the reel base gear 25 and the intermediate gear 27 by the rolling motion of the eccentric cam 4 so that the reel base shaft 22
Is rotated counterclockwise and the reel base shaft 23 is rotated clockwise when the tape is wound.

First and second sensor plates 6 and 7 are mounted on the upper surfaces of the intermediate gear 27 and the reel base gear 25 of the reel base shaft 23, respectively.
The sensor plate 6 is a spring (not shown) in the intermediate gear 27,
The sensor plate 7 is frictionally coupled to the intermediate gear 27 and the reel base gear 25, respectively, by springs in unillustrated claws fixed to the upper end of the reel base shaft 23.

Pinch rollers (not shown) are arranged so as to be alternately pressed against the capstan shafts 14 and 15.

A gear 4a is engraved on the outer periphery of the eccentric cam 4, and an eccentric cam surface 4c is formed as a protrusion in a recess 4b at the center of the upper surface and a jetty 4d is formed around the periphery.
Are formed on the side opposite to the eccentric cam surface 4c.
On the line connecting the outermost position α of 4c and the center of the spindle 11, and the spindle 11
From the outermost position to a position equal to the outermost position, a switching engaging portion 4e is formed, and pins 28 and 29 fixed downward at the tips of the first and second sensor plates 6 and 7 are provided in the recess 4b. The pin 28 is in sliding contact with the eccentric cam surface 4c, and the pin 29 is in sliding contact with the inner peripheral surface of the jetty 4d while the tape is being wound up by the reel base shaft 22 while being put in. As shown in FIG. 3, while the reel base shaft 23 is winding the tape, the pin 29 is in sliding contact with the eccentric cam surface 4c, and the pin 28 is the jetty.
It is in sliding contact with the inner surface of 4d.

The left side of the slide plate 5 is extended to form an engaging protrusion 5b that engages with a slide switch 30 fixed on the chassis 1, and the slide switch 30 switches the track of a magnetic head (not shown).

One-turn springs 8 and 9 are loosely fitted on the outer circumferences of the boss portions 6a and 7a of the first and second sensor plates 6 and 7, respectively. The first pressed portion 8a and the second pressed portion 9a at one end of the springs 8 and 9 are the switching plate 2 respectively.
Of the first pressing portion 2e and the second pressing portion 2f, the first pressing portion when the switching plate 2 is inclined to the right side as shown in FIG.
2e is separated from the first pressed portion 8a, and the pin 28 of the first sensor plate 6 is between the eccentric cam surface 4c and the jetty 4d. Second
The pressing portion 2f presses the second pressed portion 9a, and the pin 29 of the second sensor plate 7 is pressed against the jetty 4d and locked so as not to move to the eccentric cam surface 4c side.

The operation of the auto-reverse mechanism is that when the switch (not shown in FIG. 1) is closed and the motor 18 is rotated clockwise, the rotation of the reverse flywheel 17 causes the pinion 20 of the capstan shaft 15, the idler gear 21, and the center gear. 3 is transmitted to the gear 4a of the eccentric cam 4 and is also transmitted to the reel base gear 24 via the intermediate gear 27 so that the tape is on the right reel base shaft 22.
It is wound up on the side. At this time, the first pressed portion 8a of the first sensor plate 6 is separated from the first pressed portion 2e, and the pin 28 is formed on the eccentric cam surface.
It is slidably swung around the circumference of 4c.

Next, when the rotation of the reel base shaft 22 is stopped at the end of the tape,
The pin 28 of the first sensor plate 6 is pushed to the outermost position α of the eccentric cam surface 4c as shown by the two-dot chain line in FIG. When 4 is rotated 180 °, the switching engaging portion 4e is pressed against the pin 28, and when the eccentric cam 4 is further rotated, the gear 4a of the eccentric cam 4 is the small gear of the center gear 3 as shown in FIG. As shown in FIG. 3, the large gear 12 meshes with the reel base shaft 25 as it rolls to the reel base shaft 23 side that meshes with 3a and the reel base shaft 23
Is rotated clockwise.

At this time, the switching plate 2 in which the eccentric cam 4 is supported by the support shaft 11 is the support shaft.
The slide plate 5 is slid to the right by rotating about 10.
The track of the magnetic head not shown is the slide switch 30.
The rotation of the center gear 3 is switched by the reel spindle 23.
Side is automatically switched to tape 15 capstan shaft
And pinch rollers (not shown) rotate the reel spindle in reverse.
It is wound up on side 23. In this state, since the switching plate 2 is inclined to the left, the pressing of the second pressed portion 9a by the second pressing portion 2f is released, so that the pin 29 of the second sensor plate 7 slides around the eccentric cam surface 4c. Since the first pressing portion 2e presses the first pressed portion 8a while being contacted and swung, the pin 28 of the first sensor plate 6 is pressed.
Is pressed against the jetty 4d and is not moved to the eccentric cam surface 4c side.

When the tape shown in FIG. 3 reaches the end of the tape while it is wound on the reel base shaft 23 side, the rotation of the reel base gear 25 of the reel base shaft 23 is stopped and the pin 29 of the second sensor plate 7 becomes an eccentric cam surface.
When the eccentric cam 4 is rotated 180 ° by being pushed out to the outermost position of 4c, the pin 29 is engaged with the switching engaging portion 4e.
When the eccentric cam 4 is further rotated, the gear 4a of the eccentric cam 4 is rolled on the reel base shaft 22 side while meshing with the small gear 3a, and the state shown in FIG. It meshes with the gear 27.

At this time, the switching plate 2 is rotated and the slide plate 5 is slid to the left side, the track of the magnetic head (not shown) is switched by the slide switch 30, and the reel base shaft 22, the pinch roller (not shown) and the capstan shaft 14 are used for tape. Is wound around the reel base shaft 22 side.

When the automatic reverse mechanism of the automatic reverse tape recorder is configured as described above, the first and second sensor plates 6,
Reference numeral 7 denotes the first and second pressing portions 2e, 2 outside the rotation range of the switching engagement portion 4e of the eccentric cam 4 in the forward transfer state and the reverse rotation feed state, respectively.
No malfunction occurs by pressing and displacing the first and second pressed portions 8a and 9a respectively with f.

[Effect of device]

According to the present invention, as described above, the first and second sensor plates have the first and second pressed portions respectively in the forward transfer state and the reverse feed state.
・ The automatic reverse tape recorder that is pressed by the second pressing part and has a practically excellent effect such that no malfunction occurs because the pressed sensor plate is pressed and displaced outside the rotation range of the engagement part for switching the eccentric cam. It is possible to provide the auto reverse mechanism of.

[Brief description of drawings]

An embodiment of the present invention is shown in the drawings, FIG. 1 is a plan view of a main part of a tape through a chassis of an auto-reverse tape recorder being wound on a reel stand on the right side, and FIG. 2 is a plan view of a switching plate. FIG. 3 is a plan view of an essential part of the tape when the tape is being wound on the left reel stand by switching the switch plate to the left side. FIG. 4 is an explanatory view of the operation of switching the switch plate from the right side to the left side. It is a principal part top view of the automatic reverse mechanism of the reverse tape recorder which the applicant already proposed. 2 ... switching plate, 2e ... first pressing part, 2f ... second pressing part,
4 ... eccentric cam, 4e ... switching engagement part, 6 ... first
Sensor plate, 7 ... Second sensor plate, 8a ... First pressed part, 9a ... Second pressed part.

Claims (1)

[Scope of utility model registration request] 1. An eccentric cam surface driven by a motor, a cam gear having an engaging portion at an outermost position of the eccentric cam surface, a pair of reel base gears, an intermediate gear meshing with one reel base gear, and the other. And a sensor plate which is frictionally coupled to the reel base gear of each of the rollers and alternately slidably contacts the eccentric cam surface, and the cam gear is rotatably supported and swingably provided on the take-up reel side and the supply reel side. A switching plate and a slide plate for switching the pressure contact between the pinch roller and the capstan shaft by swinging the switching plate are provided, and the sensor plate detects the stop of the winding side reel, and the sensor plate and the engaging portion. Is engaged to convert the rotational force of the cam gear to the rotational force of the cam gear, or the rotational force of the cam gear itself swings the switching plate to engage the dead plate engaged with the switching plate. Point An automatic reverse tape recorder in which a spring is actuated to urge the switching plate to one of the reel base gear sides, and the slide plate is slid to switch the pressure contact between the pinch roller and the capstan shaft. A sensor plate frictionally coupled to the intermediate gear is a first sensor plate, a sensor plate frictionally coupled to the other reel base gear is a second sensor plate, and a first pressed portion is a second sensor plate on the first sensor plate. The plate is provided with second pressed parts, and the switching plate is provided with the first pressed part.
A second pressing portion is provided, and when the intermediate gear transmits the driving force of the motor to the one reel base gear, the second pressed portion of the second sensor plate on the supply reel base side in the winding traveling state. In the winding traveling state in which the other reel base gear is pressed by the second pressing portion of the switching plate and is rotated by receiving the driving force of the motor, the first pressed target of the first sensor plate on the supply reel base side. Portion is pressed by the first pressing portion of the switching plate, and in any winding state, the sensor plate on the supply reel base side is pressed and displaced to a position outside the rotation range of the engaging portion provided on the cam gear. The auto-reverse mechanism of the auto-reverse tape recorder.