JP2606974Y2 - Auto reverse type tape recorder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-reverse type tape recorder.

[0002]

2. Description of the Related Art Conventionally, there is an auto-reverse type tape recorder having a plurality of modes such as a forward play mode, a reverse play mode, a high-speed running mode, and a stop mode. Some tape recorders control rotation of a cam gear by controlling rotation of a motor using a plunger to switch modes.

By turning the plunger on or off, the rotation of the cam gear is controlled to switch the tape running mechanism and circuit, and various mechanical operations are controlled so as to correspond to each mode.

[0004]

In the above-mentioned conventional tape recorder, it is necessary to arrange a plunger in order to select each mode. The plunger is a large part and requires a circuit for operating the plunger, so that the device becomes expensive and large.

Accordingly, an object of the present invention is to eliminate the mode switching plunger of the auto-reverse type tape recorder to reduce the size and cost, and to ensure the mode switching.

[0006]

SUMMARY OF THE INVENTION According to the present invention, in an auto-reverse type tape recorder having a plurality of modes such as a forward play mode, a reverse play mode, a high-speed running mode, and a stop mode, a reel base is controlled and a control is performed. A gear switching lever having a mating pin, a control lever controlling a pinch roller and having an engaging pin, and a first cam portion controlling the gear switching lever and the control lever to positions corresponding to the respective modes. A cam gear forming a second cam portion, wherein an engagement pin of the gear switching lever is engaged with the first cam portion of the cam gear, and the control lever of the control lever is engaged with a second cam portion of the cam gear. A plurality of elastically deformable point portions are formed on the first and second cam portions of the cam gear, respectively, by engaging the engagement pins. Forming a plurality of detection units for operating the detection member to the cam gear with disposing the detection member for detecting the position corresponding to the point portion of the gear,
The rotation of the cam gear causes the engagement pin of the gear switching lever and the engagement pin of the control lever to move to the first position of the cam gear.
And by passing through the respective point portions of the second cam portion while being elastically deformed, the gear switching lever and the control lever are controlled to positions corresponding to the respective modes, and the respective detections of the cam gears are performed. When the detection member detects the respective point portions by operating the section, the rotation of the cam gear is controlled based on a detection signal from the detection member.

[0007]

The engaging pin 25 of the gear switching lever 21 and the engaging pin 28 of the control lever 26 are connected to the point 2 of the cam gear 1.
a, 3a, 8a, 9a, 2b, 3b, 8b, 9b are elastically deformed to form point portions 2a, 3a, 8a, 9a, 2b,
3b, 8b, 9b, and the cam portions 4 to 7, 10 to 13
, The rotation of the cam gear 1 can be controlled, and the gear switching lever 21 and the control lever 26 can be controlled in each mode. That is, by controlling the rotation of the cam gear 1, the pendulum gear 58 and the pinch rollers 35, 38 or the high-speed mode gear 23 are arranged at positions corresponding to the respective modes. Therefore, the plunger for switching the mode of the auto-reverse type tape recorder can be omitted, so that the cost and the size can be reduced.

When the detecting portions 48 and 49 of the cam gear 1 press a leaf switch 47 as a detecting member, the point portions 2a, 3a, 2b, 3b, 8a,
Since the position states of the engagement pin 25 of the gear switching lever 21 and the engagement pin 28 of the control lever 26 with respect to 9a, 8b, 9b can be detected, the mode can be switched reliably.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The tape recorder of this example is an auto-reverse type having a play mode in a forward mode or a reverse mode and a high-speed running mode.

FIG. 1 is a diagram showing a configuration related to the cam gear 1, and FIG. 2 is a diagram showing the cam gear 1. FIG. 1 shows the state of the stop mode.

In FIG. 1, reference numeral 1 denotes a cam gear (indicated by a one-dot chain line in the figure), and the cam gear 1 is rotatably disposed on a support shaft 50 projecting from a mechanical chassis (not shown). This cam gear 1 has two surfaces (cam surfaces 1A, 1A).
B) are formed with cam portions 4 to 7 and 10 to 13 as shown in FIG.

As shown in FIG. 2, the cam gear 1 has a cutout 1D formed on the outer periphery thereof with a gear 1C at a predetermined angular range. In addition, cam parts 4-7, 10
13 are formed with contact portions 4a to 7a and 10a to 13a to be described later. FIG. 2A is a diagram showing a cam surface 1A of the cam gear 1, and FIG. 2B is a diagram showing a cam surface 1B opposite to the cam surface 1A of the cam gear 1.

In FIG. 1, reference numeral 20 denotes a gear (indicated by a two-dot chain line in the figure). The gear 20 is rotatably disposed on a support shaft 22 disposed on a mechanical chassis (not shown). The gear 20 is driven by rotating a motor (not shown) clockwise or counterclockwise.

Reference numeral 21 is a gear switching lever, 26 is a control lever, and the gear switching lever 21 is a cam surface 1A of the cam gear 1.
It is arranged on the side. The control lever 26 is arranged on the cam surface 1B side of the cam gear 1. And the gear switching lever 2
1. The control lever 26 rotates around the support shafts 22 and 27, respectively. The gear switching lever 21 is frictionally coupled to the gear 20 via a high-speed mode gear 23 or a driving gear 24.

As shown in FIG. 1, the gear switching lever 21 has a high-speed mode gear 23 at one end and an engaging pin 25 (shown by a broken line in the figure) for engaging with the cam gear 1 at the other end. The high-speed mode gear 23 and the engagement pin 25
And a drive gear 24 that meshes with the gear 20 and the gear portion 1C of the cam gear 1.

The drive gear 24 is always meshed with the gear 20. Then, when the drive gear 24 rotates, the cam gear 1 rotates clockwise or counterclockwise. The drive gear 24 meshes with the gear portion 1C of the cam gear 1 in the stop mode described below (see FIG. 8), and in the play mode and the high-speed running mode, the drive gear 24 faces the notch 1D (FIG. 10). , FIG. 13, FIG. 16, FIG.
9).

As shown in FIG. 1, the control lever 26
An engagement pin 28 (shown by a broken line in the figure) that engages with the cam gear 1 is formed at one end, and an engagement pin 29 is formed at the other end.

Reference numerals 30 and 31 denote capstans. A flywheel (not shown) is integrally connected to the capstans 30 and 31. And the flywheel
It is driven by rotation of a motor (not shown).

Reference numeral 32 denotes a direction lever. The direction lever 32 is slidably arranged on a mechanical chassis (not shown) so as to be slidable right and left as viewed in the figure. As shown in FIG. 1, the direction lever 32 has an engagement portion 33 having a wall 33 a that engages with the engagement pin 29 of the control lever 26 on the right side. An engagement hole 32a as shown in FIG. 1 is formed on the left side of the direction lever 32, and valley portions 32b to 32
d is formed.

The valley 32b of the direction lever 32
A spring 52 is provided at a position corresponding to 32d.
The spring 52 is provided in the valley 32 of the direction lever 32.
b to 32d. The direction lever 32 is held at any one of the valleys 32b to 32d by the spring 52.

Reference numerals 34 and 37 denote pinch levers (indicated by dashed lines in FIG. 1). These pinch levers 34 and 37 are disposed on the left and right sides of a head (not shown), respectively. Also,
The pinch levers 34 and 37 are connected to the direction lever 32.
Is engaged. The head is arranged on an operating chassis (not shown).

The pinch levers 34, 37 are provided with pinch rollers 35, 38 for pressing against the capstans 30, 31, respectively. And the direction lever 32
Slides in the left-right direction, the pinch levers 34 or 37 are linked, and the pinch rollers 35 or 3
8 comes into contact with and separates from the capstan 30 or 31. The pinch levers 34 and 37 are, as shown by the alternate long and short dash lines in FIG.
It rotates around 9.

Reference numerals 40 and 41 denote reel stands (indicated by two-dot chain lines in FIG. 1). These reel stands 40 and 41 are disposed on the left and right sides of a mechanical chassis (not shown), respectively. Gears (not shown) are provided on the lower surfaces of the mechanical chassis on the reel bases 40 and 41, respectively. The reel table 41
Is a take-up side, and the reel base 40 is a supply side.

Reference numerals 42 and 43 denote gears.
Reference numerals 43 are respectively disposed on the left and right sides of a mechanical chassis (not shown) so as to mesh with the high-speed mode gear 23. 42
A and 43A are gears (indicated by a dashed line in the figure), and the gears 42A and 43A are frictionally coupled to the gears 42 and 43. The gears 42 and 43 are mounted on the reel bases 40 and 4.
1 is always meshed with a gear (not shown).

Reference numeral 44 denotes a pendulum lever. The pendulum lever 44 is disposed so as to be rotatable about the support shaft 22.
As shown by a two-dot chain line in FIG.
A pendulum gear 58 that meshes with the gear 57 is provided. The gear 57 is rotatably disposed on the support shaft 22. The pendulum gear 58 meshes with the gears 42A and 43A as the pendulum lever 44 rotates.

As shown in FIG. 1, the pendulum lever 44 has an engaging pin 45 formed thereon. The engagement pin 45 is engaged with the engagement hole 32a of the direction lever 32. When the direction lever 32 slides, the pendulum lever 44 rotates and the pendulum gear 5
8 meshes with the gear 42A or 43A.

That is, when the control lever 26 rotates and the direction lever 32 slides, the pinch rollers 35 and 38 and the pendulum gear 58 are controlled.

Next, the relationship between the cam gear 1 and the gear switching lever 21, that is, the relationship between the cam surface 1A of the cam gear 1 and the engaging pin 25 of the gear switching lever 21 will be described.

The cam surface 1A is formed with point portions 2a and 2b and a wall portion 3 as shown in FIG. 2A. And
Four cam portions 4 to 7 are formed by the point portions 2 a and 2 b and the wall portion 3. In addition, the point portions 2a and 2b
It is formed substantially in the middle of the cam portions 4 to 7.

In the middle of the point portions 2a and 2b, FIG.
As shown in FIG. 7, a contact portion 2c is formed, with which the engagement pin 25 of the gear switching lever 21 contacts in the stop mode. Then, as shown in FIG. 2A, the point portion 2a is formed to be elastically deformable and bent so as to face the outer peripheral side. The point portion 2a is formed so as to be elastically deformable, and is bent to face the axis.

As shown in FIG. 2A, point portions 3a and 3b are formed on the wall portion 3 forming the entrances and exits of the cam portions 4 to 7 so as to be elastically deformable. The point 3a is formed so as to correspond to the point 2a, and the point 3b is formed so as to correspond to the point 2b.

The cam section 4 is set in a fast-forward mode (FF mode) which is a high-speed running mode (see FIG. 16). As shown in FIG. 18, the cam portion 4 has a contact portion 4a that comes into contact with the engagement pin 25 during the transition from the FF mode to the stop mode.

The cam section 5 sets the gear switching lever 21 in a neutral state (a state in which the gear 28 does not mesh with the gears 42 and 43). As shown in FIG. 10, the cam portion 5 has a contact portion 5a with which the engagement pin 25 of the gear switching lever 21 contacts in the forward play mode. As shown in FIG. 12, the cam portion 5 is provided with a contact portion 5b with which the engagement pin 25 contacts when shifting from the forward play mode to the stop mode.

The cam section 6 is set in a rewind mode (REW mode) as a high-speed running mode (see FIG. 19).
It is. As shown in FIG. 21, the cam portion 6 has an engaging pin 25 during the transition from the REW mode to the stop mode.
The contact portion 6a is formed to contact with the contact portion 6a.

The cam section 7 sets the gear switching lever 21 in a neutral state. As shown in FIG. 13, the cam portion 7 has the gear switching lever 21 in the reverse play mode.
A contact portion 7a with which the engagement pin 25 contacts is formed.

As shown in FIG. 15, the cam portion 7 is provided with a contact portion 7b with which the engaging pin 25 contacts when shifting from the reverse play mode to the stop mode.

Next, the relationship between the cam gear 1 and the control lever 26, that is, the relationship between the cam surface 1B of the cam gear 1 and the engaging pin 28 of the control lever 26 will be described.

Point portions 8a and 8b and wall portions 9A to 9C are formed on the cam surface 1B as shown in FIG. 2B.
The four cam portions 10 to 13 are formed by the point portions 8a and 8b and the wall portions 9A to 9C. The point portions 8a and 8b are formed substantially in the middle of the cam portions 10 to 13.

In the middle of the point portions 8a and 8b, FIG.
As shown in FIG.
A contact portion 8c with which the engaging pin 28 contacts is formed. Then, as shown in FIG. 2B, the point portion 8a is formed so as to be elastically deformable, and is bent so as to face the outer peripheral side. The point portion 8b is formed so as to be elastically deformable, and is bent so as to face the axis.

The wall portions 9A and 9B constituting the entrances and exits of the cam portions 10 to 13 have point portions 9 as shown in FIG.
a and 9b are each formed so that elastic deformation is possible. The point part 9a is formed so as to correspond to the point part 8a, and the point part 9b is formed so as to correspond to the point part 8b.

The cam section 10 is set in a fast-forward mode (FF mode) which is a high-speed running mode (see FIG. 17).
It is. The cam portion 10 has the engaging pin 2 in the FF mode.
An abutment portion 10a that abuts with 8 is formed.

The cam section 11 sets the control lever 26 in the forward play mode. As shown in FIG.
As shown in FIG. 1, an abutting portion 11a with which the engaging pin 28 of the control lever 26 abuts in the forward play mode is formed.

The cam section 13 is for setting a rewind mode (REW mode) as a high-speed running mode (see FIG. 20). As shown in FIG.
The contact portion 13 that contacts the engagement pin 28 in the EW mode state
a is formed.

The cam section 12 sets the control lever 26 in the reverse play mode. FIG.
As shown in FIG. 7, a contact portion 12a with which the engagement pin 28 of the control lever 26 contacts in the reverse play mode is formed.

The engagement pin 25 of the gear switching lever 21 with the cam gear 1 and the engagement pin 28 of the control lever 26
Are set to be substantially the same on the front and back sides near the point portions 2a, 2b and 8a, 8b.

The gear switching lever 21 is set so as to easily rotate in accordance with the rotation of the gear 20 when shifting from the play mode or the high-speed running mode to the stop mode.
It is necessary to prevent a load from being applied to one engagement pin 25. Therefore, the restriction on the cam gear 1 is controlled by the contact portions 10 a to 13 a of the cam portions 10 to 13 and the control lever 2.
6 due to engagement with the engagement pin 28.

As shown in FIG. 2A, the cam gear 1 has V-shaped engaging portions 53, 54, 5 on its cam surface 1A side.
5 are formed. The engagement portions 53, 54, 55
This is for holding the position of the cam gear 1.

Further, as shown in FIG. 2B, the cam gear 1 has a gear tooth-shaped detecting portion 4 on its outer peripheral surface on the cam surface 1B side.
8, 49 are formed. The detection units 48 and 49
As will be described in detail later, this is for detecting the positions of the engagement pin 25 of the gear switching lever 21 and the engagement pin 28 of the control lever 26 with respect to the rotational position of the cam gear 1, that is, the point portions 2a, 2b and the like.

In FIG. 8, reference numeral 46 denotes a helical coil spring.
4 and 55 are disposed at the corresponding positions. The spring 46 has a V-shaped engaging portion 46a substantially corresponding to the engaging portions 53, 54, 55.

The state in which the locking portion 46a and the engaging portion 53 are engaged is the stop mode, and the locking portion 46a
A state in which the engaging portion 54 is engaged with the engaging portion 54 is a state of the forward play mode, and a state in which the engaging portion 46a is engaged with the engaging portion 55 is a state of the reverse play mode.

In FIG. 7, reference numeral 47 denotes a leaf switch as a detecting member, and an operator 47a is arranged on the leaf switch 47. And leaf switch 47
Means that the cam gear 1 is rotated and the operator 47a is
It is arranged to be turned on when it reaches a position corresponding to 49.

That is, the point portions 2a, 2a of the cam gear 1
b (8a, 8b) to the engagement pin 25 of the gear switching lever 21
When the detection portions 48 and 49 face the operation element 47a and the leaf switch is turned on when the (engagement pin 28 of the control lever 26) passes, the rotation position of the cam gear 1 can be detected.

Subsequently, the engagement pin 2 of the gear switching lever 21
5 and the point portions 2a, 2b, 3a and 3b, or the engagement pin 28 of the control lever 26 and the point portions 8a,
The engagement state with 8b, 9a, 9b will be described.

First, referring to FIG. 3, a case where the mode is shifted from the stop mode to the fast-forward mode will be described using the cam surface 1A of the cam gear 1. When the cam gear 1 is rotated clockwise by the drive gear 24, the engagement pin 25 in the stop mode state (the state of FIG. 3A) comes into contact with the point portion 2a (see FIG. 3B).

When the cam gear 1 is further rotated clockwise, first, the point portion 2a is pressed against the support shaft 50 and is elastically deformed. Further, the point portion 3a is pressed by the point portion 2a and is elastically deformed to be in a state shown in FIG. 3B.

Further, the cam gear 1 rotates clockwise, and the engaging pin 25 moves to the entrance / exit of the cam portion 4 (see FIG. 3C). As a result, the engagement pin 25 moves to the cam portion 4 side, and the gear switching lever 21 enters a fast-forward mode as shown in FIG. As shown in FIG. 3C, the point portions 2a and 3a return to the original state (the state of FIG. 3A) when the engaging pin 25 passes.

When shifting from the stop mode to the fast-forward mode, on the cam surface 1B of the cam gear 1, the engaging pin 28 of the control lever 26 is moved to the point 8a.
9a is elastically deformed and moves to the cam portion 10. The engagement pin 25 (28) moves while being restricted by the wall 3 (9).

Next, referring to FIG. 4, a description will be given of a case where the mode shifts from the stop mode to the forward play mode, using the cam surface 1B of the cam gear 1. FIG. First, as described with reference to FIG.
Is rotated clockwise to pass the engaging pin 28 in the stop mode from the point portions 8a and 9a,
The state shown in FIG.

When the cam gear 1 is rotated counterclockwise from the state shown in FIG. 4A, as shown in FIG. 4B, the engaging pin 28 comes into contact with the point portions 8a and 9a, and
a is pressed against the outer peripheral surface side of the cam gear 1, and the point portion 9a is pressed against the support shaft 50 side.

Therefore, the engagement pin 28 is located at a position facing the entrance of the cam portion 11 as shown in FIG. 4C. When the cam gear 1 is rotated clockwise again, the engaging pin 28 comes into contact with the contact portion 11a of the cam portion 11 (FIG. 11).
reference).

As a result, the control lever 26 enters the forward mode play mode. As shown in FIG. 4C, the point portions 8a and 9a return to the original state (the state of FIG. 4A) when the engaging pin 28 passes.

When shifting from the stop mode to the forward mode play mode, the engagement pin 2 of the gear switching lever 21 is provided on the cam surface 1A of the cam gear 1.
5 moves to the cam part 5 which makes the point parts 2a and 3a elastically deform and becomes a neutral state.

Further, as shown in FIG. 7A, whether or not the engagement pins 25, 28 are located at the point portions 2a, 8a is determined as follows.
When the detector 48 of the cam gear 1 presses the operator 47a of the leaf switch 47, the lease switch 47 is turned on and detected.

That is, when the leaf switch 47 is turned on, it is detected that the engagement pins 25, 28 are located at the point portions 2a, 8a. Then, the detection signal is supplied to a microcomputer (not shown) and a motor (cam gear 1) not shown
To control the direction of rotation.

Further, based on FIG. 5, a rewind mode (REW) which is a high-speed running mode from the stop mode state.
Mode), the cam surface 1 of the cam gear 1
A will be described using A. First, as described in FIG.
The cam gear 1 is rotated clockwise by the drive gear 24 so that the engagement pin 25 of the gear switching lever 21 in the stop mode is passed through the point portions 2a and 3a and positioned at the entrance and exit of the cam portion 4.

Subsequently, as described with reference to FIG. 4, the cam gear 1 is rotated counterclockwise so that the engagement pin 25 passes through the point portions 2a and 3a, so that the engagement pin 25 passes through the entrance and exit of the cam portion 5 as shown in FIG. 5A. Make them face each other. Subsequently, when the cam gear 1 is rotated counterclockwise, as shown in FIG. 5B, the point 2b is pressed outward by the engagement pin 25, and at the same time, the point 3b is pressed outward by the point 2b. .

When the cam gear 1 is further rotated counterclockwise, as shown in FIG. 5C, the engaging pin 25 passes through the point portions 2b, 3b and is located at the entrance of the cam portion 6.
Then, the engagement pin 25 is separated from the wall portion 3 of the cam portion 6, so that the gear switching lever 21 is in the rewind mode (see FIG. 19). The point portions 2b and 3b are shown in FIG.
As shown in C, when the engaging pin 25 passes, the state returns to the original state (the state of FIG. 5A).

When shifting from the stop mode to the rewind mode, which is a high-speed running mode, the cam gear 1
In the cam surface 1B, the engagement pin 2 of the control lever 26
8 elastically deforms the points 8b and 9b and moves to the contact portion 13a of the cam portion 13.

Further, whether or not the engagement pins 25, 28 are located at the point portions 2b, 8b is determined as shown in FIG.
When the detector 49 of the cam gear 1 presses the operator 47a of the leaf switch 47, the leaf switch 47 is turned on and detected.

That is, when the leaf switch 47 is turned on, it is detected that the engaging pins 25 and 28 are located at the point portions 2b and 8b. Also in this case, the detection signal is supplied to a microcomputer (not shown) to control the rotation direction of the cam gear 1.

Next, a description will be given of a case where the state is shifted from the stop mode to the reverse play mode.
When the cam gear 1 is rotated counterclockwise by the drive gear 24, the engagement pin 25 of the gear switching lever 21
, The gear change lever 21 is in the reverse play mode (see FIG. 13).

In this case, on the cam surface 1B of the cam gear 1, the engaging pin 28 of the control lever 26 moves to the abutment portion 12a of the cam portion 12 in the reverse play mode. In order to move from the reverse play mode to the stop mode, the cam gear 1 is rotated clockwise to bring the engagement pin 25 of the gear switching lever 21 into contact with the contact portion 2c to set the stop mode.

Finally, the case where the mode is shifted from the fast-forward mode, the forward play mode or the rewind mode to the stop mode will be described using the cam surface 1A of the cam gear 1. First, when in the fast-forward mode or the forward play mode, the engagement pin 25 of the gear switching lever 21 is arranged at the entrance and exit of the cam portion 6 by taking the procedure of shifting to the rewind mode (see FIG. 6A).

When the cam gear 1 is rotated clockwise from this state, as shown in FIG. 6B, the engaging pin 25 presses the point portion 2b to be elastically deformed. Simultaneously with this elastic deformation, as shown by a two-dot chain line in FIG. 6B, the engaging pin 25 presses the point portion 3b outward to elastically deform.

When the cam gear 1 is further rotated clockwise, as shown in FIG. 6C, the engagement pin 25 passes through the point portions 2b and 3b and returns to the contact portion 2c of the point 2, that is, the stop mode position. Return. In this case, on the gear surface 1B of the cam gear 1, the engaging pin 28 of the control lever 26 elastically deforms the point portions 8b, 9b and returns to the stop mode position, which is the contact portion 8c of the point 8.

Next, the rotation of the cam gear 1 and the state of each lever and each gear will be described in more detail. First, an operation of shifting from the stop mode to the play mode in the forward mode will be described. In the stop mode,
As shown in FIG. 8, the engagement pin 25 of the gear switching lever 21 (indicated by a one-dot chain line in FIG. 8) is brought into contact with the contact portion 2c of the cam gear 1.
, The high-speed mode gear 23 is not meshed with the gears 42 and 43 for driving the reel bases 40 and 41.

In the stop mode, the drive gear 24 and the gear portion 1C of the cam gear 1 mesh with each other as shown in FIG. In the stop mode, as shown in FIG. 1, the pinch rollers 35 and 38 are separated from the capstans 30 and 31.

Further, the engaging pin 28 of the control lever 26
Are in contact with the contact portion 8c of the cam gear 1 as shown in FIG. Further, as shown in FIG. 8, the engaging portion 46a of the spring 46 and the engaging portion 53 of the cam gear 1 are engaged, and the rotation of the cam gear 1 is restricted.

Further, the valley 3 of the direction lever 32
2c and the spring 52 are engaged, and the direction lever 32
Is held. FIG. 8 is a diagram showing a configuration related to the cam surface 1A of the cam gear 1, and FIG. 9 is a diagram showing a configuration related to the cam surface 1B of the cam gear 1.

To set the forward play mode from this state, the gear 20 is rotated clockwise and the cam gear 1 is rotated clockwise. Then, as described above, the engagement pin 28 of the control lever 26 is moved to the point portion 8a,
Pass through 9a. After this passage, the cam gear 1 is rotated counterclockwise to allow the engagement pin 28 to pass through the point portions 8a and 9a (see FIG. 4C).

When the cam gear 1 is further rotated clockwise, the engaging pin 28 of the control lever 26 engages with the contact portion 11a of the cam portion 11 of the cam gear 1 as shown in FIG. Enter play mode.

That is, since the control lever 26 rotates clockwise, when the engaging pin 29 presses the wall 33a of the lever 32, the direction lever 32 (see FIG. 1) slides to the left and the pinch roller 35 is Stan 3
Crimp to zero. And the direction lever 32
The forward play position is maintained by the engagement of the valley 32d and the spring 52. Further, the pendulum lever 44 rotates clockwise under the control of the direction lever 32.

Then, since the pendulum gear 58 which rotates counterclockwise meshes with the gear 43A, the reel base 41 rotates counterclockwise to enter the forward play mode.

In the play mode in the forward mode, the engagement pin 25 of the gear switching lever 21 is
As shown at 0, the high-speed mode gear 23 is located at the contact portion 5a of the cam portion 5 and is separated from the gears 42 and 43. Further, although the drive gear 24 rotates and the gear portion 1C of the cam gear 1 is separated from the drive gear 24, since the spring 46 engages with the engagement portion 54 of the cam gear 1 to rotate the cam gear 1 clockwise, The drive gear 24 is the cam gear 1
Oppose the notch 1D. As shown in FIG.
Since the engaging portion 46a of the spring 46 and the engaging portion 54 of the cam gear 1 are engaged, the rotation of the cam gear 1 is restricted.

To change from the forward play mode to the stop mode, first, as shown in FIG.
Rotate 0 counterclockwise. Then, the gear switching lever 21 rotates counterclockwise, and the drive gear 24
Gear portion 1C. In this state, the engagement pin 25 contacts the contact portion 5b of the cam portion 5.

Then, as described above, the cam gear 1 rotates to enter the stop mode as shown in FIG.
When the engaging pin 25 moves from the cam 5 to the cam 6, the engaging pin 25 moves along the wall 3. Further, at the time of transition from the state of the forward play mode to the stop mode, that is, in the state corresponding to FIG. 12, the control lever 26 is held in the state of FIG.

Next, the operation of shifting from the stop mode shown in FIG. 8 to the reverse play mode will be described. The cam gear 1 is rotated counterclockwise by rotating the gear 20 counterclockwise. Then, as described above, the engagement pin 28 of the control lever 26 engages with the contact portion 12a of the cam portion 12 of the cam gear 1 to enter the reverse play mode, as shown in FIG.

That is, since the control lever 26 rotates counterclockwise, when the engaging pin 29 pushes the engaging portion 33, the direction lever 32 (see FIG. 1) slides to the right and the pinch roller 38 moves the capstan 31. Further, as shown in FIG. 14, the pendulum lever 44 rotates counterclockwise under the control of the direction lever 32. Note that the direction lever 32 is
The position of the reverse play mode is held by the engagement of b with the spring 52.

The pendulum gear 5 rotating clockwise
Since the gear 8 meshes with the gear 42A, the reel base 40 rotates clockwise to enter the reverse play mode.

In the reverse play mode, the engagement pin 25 of the gear switching lever 21 is set as shown in FIG.
The high-speed mode gear 23 is located at the contact portion 7a of the cam portion 7.
Is separated from the gears 42 and 43. Further, the driving gear 24 rotates and the gear portion 1C of the cam gear 1 is
4, the spring 46 is engaged with the engaging portion 55 of the cam gear 1.
, The cam gear 1 is rotated in the counterclockwise direction, so that the drive gear 24 faces the notch 1 </ b> D of the cam gear 1. In addition, as shown in FIG. 13, since the engaging portion 46 a of the spring 46 is engaged with the engaging portion 55 of the cam gear 1, the rotation of the cam gear 1 is restricted.

To shift from the reverse play mode to the stop mode, the gear 20 is rotated clockwise as shown in FIG. Then, the gear switching lever 21 rotates clockwise, and the drive gear 24 is moved to the gear portion 1 of the cam gear 1.
Meshes with C In this state, the engagement pin 25 contacts the contact portion 7b of the cam portion 7.

Then, as described above, the cam gear 1 rotates clockwise to enter the stop mode as shown in FIG. When the engaging pin 25 moves to the contact portion 2c, the engaging pin 25 moves along the wall 3. Also,
At the time of transition from the reverse play mode to the stop mode, that is, the state corresponding to FIG. 15, the control lever 26 is held in the state of FIG.

Next, the operation of shifting from the stop mode shown in FIG. 8 to the fast-forward mode, which is the high-speed running mode, will be described. First, the gear 20 is rotated to rotate the cam gear 1. Then, as described above, since the engagement pin 25 of the gear switching lever 21 is separated from the cam portion 4 of the cam gear 1 as shown in FIG. 16, the gear switching lever 21 further rotates clockwise to run at high speed. The mode becomes the fast forward mode.

That is, since the gear switching lever 21 rotates clockwise, the high-speed mode gear 23 meshes with the gear 43, and the rotational force of the gear 20 is transmitted directly to the reel base 41.

In the fast forward mode, the control lever 26
As shown in FIG. 17, the engagement pin 28 is located at the contact portion 10a of the cam portion 10 and the pendulum gear 58 is connected to the gear 42A.
(43A). The drive gear 24 faces the notch 1D of the cam gear 1.

To change from the fast-forward mode to the stop mode, the gear 20 is rotated counterclockwise as shown in FIG. Then, the gear switching lever 21 rotates counterclockwise, and the drive gear 24 meshes with the gear portion 1C of the cam gear 1. In this state, the engagement pin 25 comes into contact with the contact portion 4a of the cam portion 4.

Then, as described above, the cam gear 1 rotates to enter the stop mode as shown in FIG.
It should be noted that when shifting from the state of the fast-forward mode to the stop mode, that is, the state corresponding to FIG. 18, the control lever 26 is held in the state of FIG.

Finally, the operation of shifting from the stop mode shown in FIG. 8 to the rewind mode, which is the high-speed running mode, will be described. First, the gear 20 is rotated to rotate the cam gear 1. Then, as described above, since the engagement pin 25 of the gear switching lever 21 is separated from the wall 3 of the cam portion 6 of the cam gear 1 as shown in FIG. 19, the gear switching lever 21 rotates counterclockwise. To rewind mode.

That is, since the gear switching lever 21 rotates counterclockwise, the high-speed mode gear 23 meshes with the gear 42 and the rotational force of the gear 20 is transmitted directly to the reel base 40.

In the rewind mode, the control lever 26
As shown in FIG. 20, the engagement pin 28 is located at the contact portion 13a of the cam portion 13 and the pendulum gear 58 is connected to the gear 42A.
(43A). The drive gear 24 faces the notch 1D of the cam gear 1.

To shift from the rewind mode to the stop mode, the gear 20 is rotated clockwise as shown in FIG. Then, the gear switching lever 21 rotates clockwise, and the drive gear 24 meshes with the gear portion 1C of the cam gear 1. In this state, the engagement pin 25 contacts the contact portion 6a of the cam portion 6.

Then, as described above, the cam gear 1 rotates to enter the stop mode as shown in FIG.
In the transition from the rewind mode to the stop mode, that is, in the state corresponding to FIG. 21, the control lever 26 is held in the state shown in FIG.

In the state where the engagement pin 25 contacts the contact portion 6a (the state shown in FIG. 21) and the state where the engagement pin 25 contacts the contact portion 7a (the state shown in FIG. 13), the driving gear 24
Is engaged with or separated from the gear portion 1C of the cam gear 1 due to a change in the position of the gear switching lever 21 caused by a difference in rotation of the cam gear 1.

According to this embodiment, the gear switching lever 21 and the control lever 26 are connected to the point portions 2a, 3a,
2b, 3b, 8a, 9a, 8b, 9b are elastically deformed to form point portions 2a, 3a, 2b, 3b, 8a, 9a, 8
b, 9b, and moves to the cam portions 4 to 7, 10 to 13, so that by controlling the rotation direction of the cam gear 1, the gear switching lever 21 and the control lever 26 can be controlled to the play mode and the high-speed running mode. Therefore, it is not necessary to dispose a plunger for controlling the gear switching lever 21 and the control lever 26 as in the related art, and the number of parts can be reduced. Therefore, according to the present embodiment, the mode switching plunger of the auto-reverse tape recorder can be eliminated, so that the cost can be reduced and the size can be reduced.

Also, according to the present embodiment, the leaf switch 47
Point portions 2a, 3a, 2b, 3
gear switching lever 2 for b, 8a, 9a, 8b, 9b
1 engagement pin 25 and control lever 26 engagement pin 28
Mode state can be detected, so that the mode can be switched reliably.

According to this embodiment, the plunger can be dispensed with, so that the voltage drop due to the plunger with respect to the voltage applied to the IC for controlling other parts can be ignored, and the motor can be effectively used accordingly. Available. In other words, since the conventional operation of the plunger and the start of the motor do not overlap, the efficiency of the motor can be improved because only the relationship between the IC auto-clear voltage and the motor is achieved.

In this embodiment, the detecting portions 48 and 49 of the cam gear 1 are connected to the respective point portions 2A and 2b.
Although the example in which two are provided so as to correspond to (8a, 8b) is shown, the detection unit is, for example, the point units 2a, 2b (8a,
Only one position may be provided at a position where the leaf switch 47 is turned on when the pin 25 (28) passes substantially in the middle of b), and the number and position are not limited to this. In this case, it is possible to cope with the case where the rotation of the cam gear at the time of shifting to each mode is slightly increased.

Further, in this embodiment, the auto-reverse type tape recorder having the forward play mode, the reverse play mode, the high-speed running mode, and the stop mode has been described. It is not limited to this.

In this embodiment, the pendulum lever 4
4, the pendulum gear 58 is switched to each side of the reel bases 40 and 41. However, the switching of this gear is not limited to this, and the planetary gear may be used or the notch may be cut in accordance with the rotation position of the cam. The present invention is not limited to this embodiment as long as the reel base is rotated by using a gear having a portion.

[0110]

According to the present invention, the gear switching lever and the control lever elastically deform the point portion of the cam gear, pass through the point portion, and move to the cam portion. Therefore, the gear is controlled by controlling the rotation direction of the cam gear. The switching lever and the control lever can be controlled to a play mode and a high-speed running mode. Therefore, according to the present invention, it is not necessary to dispose a plunger for controlling the gear switching lever and the control lever unlike the related art, and the number of parts can be reduced. Therefore, according to the present embodiment, the mode switching plunger of the auto-reverse tape recorder can be omitted, so that the cost can be reduced and the size can be reduced.

Further, according to this invention, the position of the engagement pin of the gear switching lever and the engagement pin of the control lever with respect to the point portion of the cam gear can be detected by the leaf switch serving as the detection member, so that the mode switching can be reliably performed. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of an embodiment.

FIG. 2 is a view showing a cam gear of the embodiment.

FIG. 3 is a diagram illustrating an engagement state (a transition state from a stop mode to a fast-forward mode) between an engagement pin and a point portion according to the embodiment.

FIG. 4 is a diagram illustrating an engagement state (a transition state from a stop mode to a forward play mode) between an engagement pin and a point portion according to the embodiment.

FIG. 5 is a diagram illustrating an engagement state (a transition state from a stop mode to a rewind mode) between an engagement pin and a point portion according to the embodiment.

FIG. 6 is a diagram illustrating an engagement state (a transition state from a high-speed running mode or a forward play mode to a stop mode) between an engagement pin and a point portion according to the embodiment.

FIG. 7 is a diagram illustrating an ON state of a leaf switch according to the embodiment.

FIG. 8 is a diagram illustrating a state of a stop mode according to the embodiment.

FIG. 9 is a diagram illustrating a state of a stop mode according to the embodiment.

FIG. 10 is a diagram illustrating a state of a forward play mode according to the embodiment.

FIG. 11 is a diagram illustrating a state of a forward play mode according to the embodiment.

FIG. 12 is a diagram illustrating a transition state from a forward play mode to a stop mode in the embodiment.

FIG. 13 is a diagram illustrating a state of a reverse play mode according to the embodiment.

FIG. 14 is a diagram illustrating a state of a reverse play mode according to the embodiment.

FIG. 15 is a diagram illustrating a transition state from a reverse play mode to a stop mode in the embodiment.

FIG. 16 is a diagram illustrating a state of a fast-forward mode according to the embodiment.

FIG. 17 is a diagram illustrating a state of a fast-forward mode according to the embodiment.

FIG. 18 is a diagram illustrating a transition state from a fast-forward mode to a stop mode in the embodiment.

FIG. 19 is a diagram illustrating a state of a rewind mode according to the embodiment.

FIG. 20 is a diagram illustrating a state of a rewind mode according to the embodiment.

FIG. 21 is a diagram illustrating a transition state from a rewind mode to a stop mode in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cam gear 1A, 1B Cam surface 1C Gear part 1D Notch part 2a, 3a, 8a, 9a, 2b, 3b, 8b, 9b Point part 3, 9A-9C Wall part 4-7, 10-13 Cam part 4a-7a, 10a to 13a, 5b, 7b, 2c, 3c
Contact part 20, 42, 42A, 43, 43A Gear 21 Gear switching lever 23 High speed mode gear 24 Drive gear 25, 28, 29, 45 Engagement pin 26 Control lever 30, 31 Capstan 32 Direction lever 34, 37 Pinch Lever 35, 38 Pinch roller 40, 41 Reel base 44 Pendulum lever 47 Leaf switch 47a Operator 48, 49 Detector 58 Pendulum gear

Claims (1)

(57) [Scope of request for utility model registration] An automatic reverse type tape recorder having a plurality of modes such as a forward play mode, a reverse play mode, a high-speed running mode, and a stop mode, wherein a gear switching lever for controlling a reel base and having an engagement pin; A control lever for controlling a pinch roller and having an engagement pin; a first cam portion and a second cam portion for controlling the gear switching lever and the control lever to positions corresponding to the respective modes;
A cam gear having a cam portion formed thereon, wherein an engagement pin of the gear switching lever is engaged with a first cam portion of the cam gear, and an engagement of the control lever is engaged with a second cam portion of the cam gear. The pin is engaged, and the first
And a plurality of elastically deformable point portions formed on the second cam portion, and a detection member for detecting a position corresponding to the point portion of the cam gear is provided, and the detection member is operated on the cam gear. A plurality of detecting portions, wherein the engagement pin of the gear switching lever and the engagement pin of the control lever are moved to the first position of the cam gear by the rotation of the cam gear.
And by passing the respective point portions of the second cam portion while being elastically deformed, the gear switching lever and the control lever are controlled to corresponding positions in the respective modes, and the respective detections of the cam gears are performed. An auto-reverse type tape recorder, wherein when the detection member detects the respective point portions by operation of a section, rotation of the cam gear is controlled based on a detection signal from the detection member.