JP3398020B2 - Recording medium clamp mechanism of playback recording device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium clamping mechanism of a reproducing / recording apparatus for mounting a recording medium such as a mini disk (hereinafter abbreviated as "MD") on a head of the reproducing / recording apparatus such as a deck. .

[0002]

2. Description of the Related Art FIG. 16 shows an outline of a recording medium clamping mechanism of a reproducing / recording apparatus proposed by the present applicant as Japanese Patent Application No. 9-81178. The clamper 1 having a substantially rectangular shape is capable of accommodating and holding an MD and moving the MD up and down. A clamper shaft 2 and a guide shaft 3 are provided on one side surface of the clamper 1 so as to project outward. A cam gear 4 engages with the clamper shaft 2. The cam gear 4 engages with the clamper shaft 2 at the drive portion between the mechanical stroke ends 5 and 6. Between the mechanical stroke ends 5 and 6, the support cam surfaces 7 and 8 and the support cam surfaces 7 and 8 are provided.
And drive cam surfaces 9 and 10 provided between the two. The cam gear 4 is angularly displaceable around the axis of the support shaft 11. The support shaft 11 is supported by the main body of the recording / reproducing device (not shown) and is parallel to the clamper shaft 2 and the guide shaft 3. Mechanical stroke end 5,6
Is formed so as to extend radially outward with the support shaft 11 of the cam gear 4 as the center, and the support cam surfaces 7, 8 are formed in the circumferential direction with the support shaft 11 as the center. The drive cam surfaces 9 and 10 are formed so as to extend more radially inward than the support cam surfaces 7 and 8. The cam gear 4 includes a detected portion 1
2 and 13 are also provided, and the sensor 14 optically detects the angular displacement.

The clamper shaft 2, which is fitted between the drive cam surfaces 9 and 10, moves the clamper 1 upward or downward in accordance with the angular displacement of the cam gear 4. Clamper shaft 2
The displacement in the up-and-down direction is also transmitted to the other side surface of the clamper 1 by swinging the connecting arm 15 about the swing shaft 16. The swing shaft 16, which is the center of swing displacement of the connecting arm 15, is supported by the recording / reproducing apparatus main body (not shown), like the support shaft 11. Connecting arm 15
The front end portion 17 is engaged with the clamper shaft 2, and when the clamper 1 is vertically displaced, a torque centering on the swing shaft 16 is generated and the torque is transmitted to the other side surface of the clamper 1. The guide portion 18 fixed to the main body of the recording / reproducing device,
It has a guide groove 19 through which the guide shaft 3 is guided, and regulates the vertical displacement of the clamper 1 so as to be perpendicular to the surface of the clamper 1.

The cam gear 4 rotates clockwise (hereinafter "C
When rotated to "W"), the clamper shaft 2 is pushed up, and the clamper 1 is raised by this. Cam gear 4
The rotation of is electrically stopped by the sensor 14 detecting the end surface of the detected portion 12 provided on the cam gear 4. Mechanically, the stroke end 5 of the cam gear 4
Is stopped by hitting the clamper shaft 2.

When the cam gear 4 rotates counterclockwise (hereinafter abbreviated as "CCW"), the sensor 14 detects the end surface of the detected portion 13 of the cam gear 4 and electrically stops the driving of the cam gear 4. . Even when the stroke end 6 of the cam gear 4 contacts the clamper shaft 2, the angular displacement of the cam gear 4 is mechanically stopped.

[0006]

In the clamp mechanism of the reproducing / recording apparatus as shown in FIG. 16, the detected portions 12, 13 are detected by the sensor 14 and the driving of the cam gear 4 is electrically stopped. However, in reality, when the clamper shaft 2 hits the stroke ends 5 and 6, the rotation is mechanically stopped and the positioning is performed. Since the mechanical stroke ends 5 and 6 come into contact with the clamper shaft 2 with a large impact, problems such as breakage of the clamper shaft 2 and biting of the deformed cam gear 4 occur.

The clamper shaft 2 has a mechanical stroke end 5,
If the position of the end surface of the detected portion 13 is determined so that the angular displacement of the cam gear 4 stops before hitting 6, the inertia must be taken into consideration, and the drive must be stopped considerably ahead. Moreover, since the stop condition varies, the stop may occur before the mechanical stroke ends 5 and 6 are hit.

An object of the present invention is to provide a recording medium clamping mechanism for a reproducing / recording apparatus, which can alleviate the impact force generated when mechanically stopping the angular displacement of the cam gear and improve the durability. is there.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a recording medium held by a holding member is inserted into and ejected from a reproducing recording head of a reproducing recording apparatus main body at a mounting position where the recording medium is separated from the reproducing recording head. In the recording medium clamp mechanism of the reproducing / recording device that is switched to move to the eject position, a drive shaft provided on the side surface of the holding member and protruding outward, and a support provided on the reproducing / recording device main body and parallel to the drive shaft. The shaft and the support shaft, which are angularly displaceable around the axis of the support shaft and have a drive portion which engages with the drive shaft, so as to move the holding member to the mounting position or the insertion / ejection position in accordance with the angular displacement direction. The cam member having a blocking portion for blocking the angular displacement exceeding the range between the mounting position and the insertion / ejection position, the cam driving means for driving the cam member to perform the angular displacement, and the angular displacement state of the cam member. According to Detecting means for detecting whether or not the vehicle is at a stop position which is reached before being blocked by the section and a braking position which is provided before being blocked even if it is further angularly displaced from the stop position, and in response to the output of the detecting means. A recording medium clamping mechanism of a reproducing recording apparatus, comprising: a control unit that stops driving at a stop position and controls a cam member to drive a cam member in a reverse direction at a braking position.

According to the invention, in the holding member, the drive portion of the cam member engages with the drive shaft projecting outward from the side surface,
In accordance with the angular displacement of the cam member, switching is performed so as to move to a mounting position where the recording medium is mounted on the reproducing / recording head of the reproducing / recording apparatus main body, and an inserting / discharging position where the recording medium is separated from the reproducing / recording head and inserted / discharged. . The angular displacement state of the cam member is
The detection means detects whether the stop position reaches before the angular displacement is blocked by the blocking portion, and whether or not the braking position is further angularly displaced from the stop position and is provided before the blocking position. Controls the cam drive means that drives the cam member in angular displacement when it detects that the detection means is in the braking position, and drives it in the opposite direction to mitigate the impact force when the drive shaft is blocked by the blocking portion. can do.

Further, according to the present invention, the blocking portion of the cam member is formed so as to elastically reduce the impact force generated when the angular displacement is blocked.

According to the present invention, since the blocking portion of the cam member is formed so as to elastically reduce the impact force generated when blocking the angular displacement, the impact when blocking the angular displacement. The force can be mechanically relieved.

Further, according to the present invention, the recording medium held by the holding member is moved to a mounting position where it is mounted on the reproducing / recording head of the reproducing / recording apparatus main body, and an inserting / discharging position where the recording medium is moved away from the reproducing / recording head and inserted and discharged. In the recording medium clamping mechanism of the reproducing / recording device, the drive shaft is provided on the side surface of the holding member and protrudes outward, the support shaft provided in the main body of the reproducing / recording device, parallel to the drive shaft, and the support shaft. And has a drive portion that is angularly displaceable around the axis of the support shaft and that engages with the drive shaft, and switches the holding member to the mounting position or the insertion / ejection position according to the angular displacement direction.
Depending on the angular displacement state of the cam member, a cam member having a blocking portion for blocking angular displacement exceeding the range between the mounting position and the insertion / ejection position, cam driving means for driving the cam member to perform angular displacement, Detection means for detecting whether or not the stop position is blocked by the blocking portion, and control means for responding to the output of the detection means and controlling the cam drive means to stop the driving of the cam member at the stop position, A recording medium clamping mechanism for a reproducing / recording apparatus, comprising: a buffering unit that absorbs an impact when the cam member is prevented from angular displacement by the blocking unit.

According to the present invention, the shock absorbing means absorbs the impact when the cam member is prevented from being angularly displaced by the blocking portion, so that the impact force is prevented when the cam member is prevented from being angularly displaced beyond the stop position. The durability can be improved.

Further, in the invention, it is preferable that the cushioning means is formed by giving elasticity to the blocking portion of the cam member.

According to the present invention, since the blocking portion of the cam member is given elasticity, when the cam member continues the angular displacement and exceeds the stop position, the angular displacement is blocked by the blocking portion. The impact force can be mitigated by imparting elasticity.

[0017]

1 shows an outline of a recording medium clamping mechanism of a reproducing / recording apparatus according to an embodiment of the present invention. 1A shows a simplified plan view, and FIG. 1B shows a simplified front view. A roughly rectangular clamper 21
Is a state in which the MD is stored and held in the inside, as shown in FIG.
It can be moved in the direction of the arrow shown in, that is, in the vertical direction. The clamper 1, which is a holding member, has a clamper shaft 22 and a guide shaft 23 protruding from the front side. A cam gear 24, which is a cam member, is provided in the vicinity of the clamper shaft 22 which is a drive shaft, and an engaging portion which engages with the cam gear 24 is formed between the mechanical stroke ends 25 and 26. The mechanical stroke ends 25 and 26, which are also blocking portions, extend outward in the radial direction of the cam gear 24 and come into contact with the clamper shaft 22 to prevent further angular displacement. In the cam gear 24, support cam surfaces 27 and 28 extending in the circumferential direction are formed at the engaging portions between the mechanical stroke ends 25 and 26. In the middle of the support cam surfaces 27, 28, drive cam surfaces 29, 30 which are drive parts are formed so as to extend inward in the radial direction.

The cam gear 24 is inserted into a support shaft 31 supported by a reproducing / recording apparatus main body (not shown), and is angularly displaceable around the axis of the support shaft 31. Support shaft 31
Is parallel to the clamper shaft 22 and the guide shaft 23.
The cam gear 24 is further provided with detected portions 32 and 33, and the angular displacement state can be detected by the optical interrupt type sensor 34. The vertical displacement on one side surface of the clamper 21 is caused by the one arm 36a of the connecting arm 35.
Is transmitted to the other side surface through the other arm 36b. The connecting arm 35 is swingably displaceable around swing shafts 37a and 37b supported by the reproducing / recording apparatus main body.

The guide shaft 23 is inserted into a guide groove 39 of a guide portion 38 provided on the side of the reproducing / recording apparatus main body,
The clamper 21 is regulated and guided so that the moving direction of the clamper 21 is the vertical direction. The sensor 34 may be of various types such as an electromagnetic type as well as an optical interrupt type.

The cam gear 24 is angularly displaced and the clamper shaft 22 is moved.
Before reaching the position where the mechanical stroke ends 25 and 26 come into contact with each other, the sensor 34, which is a detecting means, detects the end faces 40 and 4
The light shielding portion starting from 1 is detected. The output of the sensor 34 is, for example, high level when the light is blocked and low level when the light is transmitted. When the light-shielding portion is detected according to the output of the input sensor 34, the control means 42 controls the cam driving means 43 so that the cam gear 2 is electrically operated.
The rotation drive of 4 is stopped. In this embodiment, the cam gear 2
After the angular displacement 4 has reached the end faces 40, 41, before the clamper shaft 22 hits the mechanical stroke ends 25, 26, slits 44, 45 are provided for blocking the light for a short time and passing the light.

2A shows the light-shielding portion of the cam gear 24, and FIG. 2B shows the relation between the detection output of the sensor 34 and the control by the control means 42. Hereinafter, description will be made with reference to FIG. In the control means 42, the sensor 34 has the end faces 40, 4
When 1 is detected, the drive of the cam drive means 43 is controlled to stop. Even if the driving of the cam driving means 43 is stopped,
Due to the inertia of rotation, or inertia, the cam gear 24
The angular displacement of continues. The control means 42 includes slits 44,
When 45 is detected, the cam driving means 43 is driven in the reverse direction, that is, in the CCW direction when driving in the CW direction, and in the CW direction when driving in the CCW direction to apply braking. The braking time is short, for example, about 10 msec. As described above, since the light-shielding portion of the cam gear 24 can be detected in two stages, the reverse brake can be electrically applied before the driving of the cam gear 24 is stopped, and the clamper shaft 22 can be operated.
It is possible to reduce the impact force when the mechanical stroke ends 25 and 26 come into contact with each other.

FIG. 3 shows the cam gear 24 as buffer means.
The leaf spring portions 46 and 47 provided near the mechanical stroke ends 25 and 26 are shown. A notch portion 48 extending in the radial direction is provided outside the mechanical stroke ends 25, 26 in the circumferential direction.
By forming 49, the leaf spring portions 46 and 47 are easily bent. Utilizing the elasticity of the leaf spring portions 46, 47,
It is possible to reduce the impact force when the clamper shaft 22 hits the mechanical stroke ends 25 and 26. FIG. 4 shows the overall structure of the cam gear 24 including the drive unit, the blocking unit, and the light shielding unit described above. Teeth 24a are partially formed on the outer periphery of the cam gear 24, and the rotational driving force for angular displacement around the axis of the support shaft 31 is transmitted to the C direction, which is the CCW direction, or the D direction, which is the CW direction. The angular displacement is possible within the range between the mechanical stroke ends 25 and 26.

FIG. 5 shows the overall structure of the MD reproducing / recording apparatus 50 having the clamper 21. Playback recording device main body 51
Is equipped with a reproducing / recording head, and is capable of reproducing the recorded information from the recording medium MD52 and recording the information in the MD52. MD52 is a magazine 53
It is possible to move the inside of the reproducing / recording apparatus main body 55 by the elevating device 54. MD playback recording device 50
The front wall 56 of the casing 55 is provided with an insertion opening 57 for inserting the MD 52 into the MD reproducing / recording apparatus 50 and ejecting it from the MD reproducing / recording apparatus 50. The magazine 53 includes trays 58a, 58b, 58c, 5 having a plurality of stages, for example, four stages.
It has 8d and can store up to 4 MD52s. The MD 52 selected from the magazine 53 or inserted from the insertion port 57 is vertically conveyed to the position of the clamper 21 by the elevating device 54, inserted into the clamper 21 in the insertion direction indicated by the arrow A, and reproduced and recorded. It is mounted on the turntable 59 of the head 51. Since the MD 52 is mounted on the turntable 59 and is detached from the turntable 59, the clamper 21 needs to move in the vertical direction. The MD 52 is discharged from the clamper 21 in the direction indicated by the arrow B.

6 and 7 show the construction of the clamper 21 and the reproducing / recording apparatus main body 51. As shown in FIG. FIG. 6 is a plan view and FIG. 7 is an exploded view.
The cam driving means 43 that rotationally drives the cam gear 24 is a worm 6 that is attached to the motor 60 and the output shaft of the motor 60.
1, a worm wheel 62 that meshes with the worm 61, a gear 63 that meshes with the worm wheel 62, and a gear 6
Gear 64 which is coaxial with 3 and meshes with teeth 24a of the cam gear 24
including. The sensor 34 for detecting the detected portions 32 and 33 of the cam gear 24 generates infrared rays from the light emitting portion 34a with an LED or the like, and detects the infrared light received by the light receiving portion 34b.
It is detected whether or not 2 and 33 block.

The connecting arm 35 is generally U-shaped, and has arms 36a and 36b formed so as to extend along the side surface of the clamper 21. Arm 36a,
36b is swingably displaceable around swing shafts 37a and 37b which are provided upright laterally from the reproducing / recording apparatus main body 51. The tip portion 65a of one arm 36a has a connecting groove 66a that engages with the clamper shaft 22. A tip portion 65b of the other arm 36b engages with a connecting groove 66b that engages with an elevating shaft 67 that is erected upright so as to extend outward from the clamper 21 on the side surface side that faces the side surface on which the cam gear 24 is provided.
Have. A guide shaft 68 parallel to the lifting shaft 67 is also provided upright on the clamper 21. The tip end of the elevating shaft 67 that engages with the tip end portion 65b of the arm 36b is inserted and guided in the guide groove 70 of the guide portion 69 formed on the side of the recording / reproducing apparatus main body 51. The guide grooves 39 and 70 prevent vertical displacement of the guide shaft 23 and the elevating shaft 67 exceeding the upper and lower limits.

A guide groove 71 for guiding the clamper shaft 22 in the vertical direction and preventing the displacement in the inserting / discharging direction is formed on the side surface of the reproducing / recording apparatus main body 51 on the cam gear 24 side. The reproducing / recording apparatus main body 51 includes a swing shaft 37 of the connecting arm 35.
Insertion holes 72 and 73 through which a and 37b are inserted are also formed. The insertion holes 72 and 73 are the swing shafts 37a and 37b.
Is formed to have an inner diameter slightly larger than the outer diameter. The guide shaft 68 of the clamper 21 is inserted into an insertion hole 74 formed in the other arm 36b of the connecting arm 35. The insertion hole 74 is formed to be larger than the outer diameter of the guide shaft 68 so that the clamper 21 can be displaced relative to the connecting arm 35. However, clamper 2
The guide shaft 68 is formed in such a size that the guide shaft 68 abuts against the excessive displacement of 1 in the vertical direction and is mechanically blocked. A receiving portion 75 is also formed below one arm 36a of the connecting arm 35, and an abutting portion 76 of the clamper 21 abuts.

8 to 14 show the relationship between the connecting arm 35 and the cam gear 24 when the clamper 21 moves from the mounting position to the insertion / ejection position. See also FIG.
Reference numeral 5 shows the operation timings of the sensor 34, the cam gear 24, the connecting arm 35 and the motor 60 during this movement.

At time t0 in FIG. 15, the cam gear 24 is most angularly displaced in the C direction as shown in FIG. While the clamper shaft 22 is in contact with the support cam surface 27, it is also in contact with the mechanical stroke end 25, and the cam gear 24 is prevented from being further angularly displaced in the C direction. At this time, the sensor 34 derives a high level output because the light is blocked by the detected part 32. Since the clamper shaft 22 is pressed downward, the connecting groove 66a is also pressed downward by the tip end portion 65a of the one arm 36a. The torque applied to the arm 36a is transmitted by the connecting arm 35, and the connecting groove 66b presses the elevating shaft 67 downward at the tip portion 65b of the other arm 36b. Since both the clamper shaft 22 and the elevating shaft 67 are pressed downward, the bottom surface of the clamper 21 is placed on the reproducing / recording apparatus main body 51, and the clamper 21 is prevented from further displacing downward, and is placed in the mounting position. Retained. Since the distal end portion 65a of one arm 36a is displaced downward and twisted, a spring force is generated in the connecting arm 35 in a direction to eliminate this twist, that is, in a direction to push the clamper shaft 22 upward. To do.

At time t1 in FIG. 15, when the control means 42 drives the motor 60 to rotate in the normal direction, the cam gear 24 is angularly displaced in the D direction while the clamper shaft 22 is in contact with the support cam surface 27 of the cam gear 24. To do. During the angular displacement, the position of the slit 44 matches the position of the sensor 34,
Although the output of is at the low level, the reverse rotation is not performed because the driving is started. When the angular displacement in the D direction continues and the position of the slit 44 moves away from the detection position of the sensor 34, the detected part 32 blocks the light again, and a high level output is derived from the sensor 34. Clamper shaft 2
When 2 is on the support cam surface 27, the position of the clamper shaft 22 is not changed by the guide groove 71 and the support cam surface 27 even if the cam gear 24 is angularly displaced. Keep the state shown. In this state, when the cam gear 24 is further angularly displaced in the D direction, the end surface 40 of the detected portion 32 separates from the detection position of the sensor 34 at time t2,
Light is transmitted and a low level output is derived from the sensor 34.

At time t3 in FIG. 15, the cam gear 24 moves to D
As a result of continuing the angular displacement in the direction, the clamper shaft 22 is guided from the support cam surface 27 to the drive cam surface 29 as shown in FIG. At this time, the clamper shaft 22 is always subjected to the upward spring force due to the twist of the connecting arm 35.
The support cam surface 27 is reliably guided to the drive cam surface 29. When the cam gear 24 is further angularly displaced in the D direction, as shown in FIG.
As shown in 0, the clamper shaft 22 pushed upward by the connecting groove 66a of the tip end portion 65a of the one arm 36a is guided by the drive cam surface 29 of the cam gear 24 and displaced upward. Along with this, the tip end portion 65a of the arm 36a is also displaced upward, and the twist of the connecting arm 35 is eliminated. The spring force is completely canceled at time t4.

When the cam gear 24 is further angularly displaced in the D direction, the clamper shaft 22 rides on the drive cam surface 30 facing the drive cam surface 29. The drive cam surface 30 pushes the clamper shaft 22 upward, and the clamper shaft 22 pushes the connecting groove 66a upward by the tip end portion 65a of the one arm 36a. A torque is generated in the arm 36a such that the arm 36a is pivotally displaced about the pivot shaft 37a, and this torque is transmitted to the other arm 36b of the connecting arm 35 and the tip portion 65 is formed.
The elevating shaft 67 is pushed up by the connecting groove 66b of b. When the clamper shaft 22 and the lifting shaft 67 are pushed up, the clamper 21
Moves away from the reproducing / recording apparatus main body 51 and moves upward.
At time t5 shown in FIG. 11, the clamper 21 is at a position approximately in the middle between the mounting position and the insertion / ejection position.

Further, when the cam gear 24 is angularly displaced in the D direction, the clamper shaft 22 is pushed up by the drive cam surface 30 and the tip end portion 65a of the arm 36a is pivotally displaced upward. FIG. 12 shows a state in which the clamper 21 reaches the insertion / ejection position at time t6 and the lifting shaft 67 is prevented from being displaced upward at the upper end of the guide groove 70 of the guide portion 69. After the time t6, even if the cam gear 24 is further angularly displaced in the D direction, the one arm 36a continues the swinging displacement, but the other arm 36b stops. Therefore, the connecting arm 45 is in a state in which one arm 36a is displaced above the other arm 36b and twisted. Since the spring force due to this twist acts downward on the clamper shaft 22, the clamper shaft 2
2 is pushed down by the connecting groove 66a of the tip portion 65a,
The clamper shaft 22 is pressed against the drive cam surface 30. Further, when the cam gear 24 is angularly displaced in the D direction, at time t7, the cam gear 24 moves from the drive cam surface 30 to the support cam surface 28 as shown in FIG. At this time, since the downward spring force acts on the clamper shaft 22, the drive cam surface 30 is surely guided to the support cam surface 28, and the transfer can be performed.

FIG. 14 shows a state in which the cam gear 24 is further angularly displaced in the D direction, the end surface 41 of the detected portion 33 blocks light at time t8, detects the slit 45 at time t9, and then stops. . The output of the sensor 34 changes from the low level to the high level at time t8, and temporarily becomes the low level at time t9. The control means 42 stops driving the motor 60 at time t8. Since the motor 60 continues to rotate due to inertia due to the inertia of rotation even after the driving is stopped, the control means 42 drives the motor 60 in the reverse direction at time t9 to apply braking by the electric reverse brake. As a result, the motor 60 is rapidly decelerated. If the cam gear 24 stops before the clamper shaft 22 hits the mechanical stroke end 26, it is possible to prevent the shock received by the clamper shaft 22. Even if the cam gear 24 continues to be angularly displaced until the clamper shaft 22 hits the mechanical stroke end 26, the impact is reduced because the speed is reduced.

Mechanical stroke end 2 of cam gear 24
5 and 26 are provided with leaf spring portions 46 and 47, respectively, in order to reduce the impact when the clamper shaft 22 is hit. Outside the leaf spring portions 46 and 47 in the C and D directions,
The cutout portions 48 and 49 are provided respectively, and the leaf spring portion 4 is provided.
The thickness of each of the springs 6 and 47 is reduced so that the springs can extend elastically easily as springs extending in the radial direction.

When the clamper 21 moves from the insertion / ejection position to the mounting position, it basically performs a symmetrical operation with respect to the operation shown in FIGS. In this embodiment, the cam gear 2
The slits 44, 45 are provided in the detected parts 32, 33 of No. 4 so as to have a shape capable of being detected in two steps, and not only the motor 60 is simply stopped but also an electric reverse brake is applied to surely stop the motor 60 and the mechanical stroke Leaf springs 46 and 47 are provided on the ends 25 and 26 to reduce the impact force when the clamper shaft 22 abuts. By using these two methods together, it is possible to reliably prevent damage to the clamper shaft 22 and bite of the gear. In addition, even if only one of the methods is used, a sufficient degree of effect can be obtained in practical use.

[0036]

As described above, according to the present invention, when the detection means detects that the braking position is present, the control means controls the cam driving means to perform braking in the direction opposite to the driving direction of the cam member. Since the reverse rotation brake is applied, the inertia of the rotation of the cam member is weakened, and the cam member can be stopped at an accurate position to prevent biting of the gear and deformation of the drive shaft.

Further, according to the present invention, since the blocking portion of the cam member elastically relieves the impact force, it is possible to prevent biting of the gear and deformation of the drive shaft.

Further, according to the present invention, since the shock absorbing means absorbs the shock when the cam member is prevented from angular displacement, the shock force generated in the blocking portion is alleviated, the biting of the gear is prevented, and the drive shaft is prevented. Deformation can be prevented.

Further, according to the present invention, since the elasticity can be imparted to the blocking portion of the cam member to alleviate the impact,
With a simple structure, it is possible to prevent biting of the gear and deformation of the drive shaft.

[Brief description of drawings]

FIG. 1 is a plan view and a front view showing a schematic configuration of an embodiment of the present invention.

2 is a partial front view showing a light shielding portion of the cam gear 24 of FIG. 1, and a time chart showing a relation between a detection output of a sensor 34 and control by a control means 42. FIG.

FIG. 3 is a partial front view showing a cushioning means provided in the cam gear 24 of FIG.

FIG. 4 is a front view showing the overall configuration of a cam gear 24 of FIG.

5 is an MD reproducing / recording device 5 including the clamper 21 of FIG.
It is sectional drawing of 0.

6 is a diagram showing a clamper 21 and a reproducing / recording apparatus main body 5 of FIG.
It is a top view which shows the structure relevant to 1.

7 is a diagram showing a clamper 21 and a reproducing / recording apparatus main body 5 shown in FIG.
FIG. 2 is an exploded perspective view showing a configuration related to 1.

8 is a diagram showing a relationship between a connecting arm 35 and a cam gear 24 of FIG.

9 is a diagram showing the relationship between the connecting arm 35 and the cam gear 24 of FIG.

10 is a diagram showing the relationship between the connecting arm 35 and the cam gear 24 of FIG.

11 is a diagram showing the relationship between the connecting arm 35 and the cam gear 24 of FIG.

12 is a diagram showing the relationship between the connecting arm 35 and the cam gear 24 of FIG.

13 is a diagram showing the relationship between the connecting arm 35 and the cam gear 24 of FIG.

14 is a diagram showing the relationship between the connecting arm 35 and the cam gear 24 of FIG.

15 is a time chart showing the driving relationship between the sensor 34 of FIG. 1, the cam gear 24, the connecting arm 35, and the motor 60 of FIG.

FIG. 16 is a front view schematically showing a clamp mechanism which is the basis of the present invention.

[Explanation of symbols]

21 clamper 22 Clamper axis 24 cam gear 25, 26 Mechanical stroke end 27, 28 Support cam surface 29,30 Drive cam surface 31 Support shaft 32,33 Detected part 34 sensors 35 connecting arm 36a, 36b arm 37a, 37b swing shaft 40, 41 end face 42 control means 43 Cam drive means 44,45 slits 46, 47 Leaf spring part 48,49 notches 50 MD playback recording device 51 Playback recording device body 52 MD 60 motor 65a, 65b Tip 66a, 66b Connection groove 67 Lifting axis

Claims (4)

(57) [Claims] 1. A mounting position at which a recording medium held by a holding member is mounted on a reproducing / recording head of a reproducing / recording apparatus main body,
In a recording medium clamp mechanism of a reproducing / recording device that is moved away from the reproducing / recording head and moved to an inserting / ejecting position for inserting / ejecting, a driving shaft provided on a side surface of a holding member and protruding outward, A support shaft provided on the main body of the device and parallel to the drive shaft, and a support shaft provided on the support shaft that is angularly displaceable around the axis of the support shaft and has a drive unit that engages with the drive shaft. A cam member having a blocking portion that blocks the angular displacement exceeding the range between the mounting position and the insertion / ejection position by switching the member to the mounting position or the insertion / ejection position, and driving the cam member to perform the angular displacement. Depending on the cam drive means and the angular displacement state of the cam member, is the stop position reached before being blocked by the blocking portion, and is the braking position provided before being blocked even if it is further angularly displaced from the stop position? And a control unit that responds to the output of the detection unit and stops the drive at the stop position and controls the cam member to drive the cam member in the reverse direction at the braking position. A recording medium clamping mechanism for a characteristic reproducing / recording device. 2. The reproducing recording according to claim 1, wherein the blocking portion of the cam member is formed so as to elastically reduce an impact force generated when blocking the angular displacement. Recording medium clamp mechanism of the device. 3. A mounting position at which a recording medium held by a holding member is mounted on a reproducing / recording head of a reproducing / recording apparatus main body,
In a recording medium clamp mechanism of a reproducing / recording device that is moved away from the reproducing / recording head and moved to an inserting / ejecting position for inserting / ejecting, a driving shaft provided on a side surface of a holding member and protruding outward, A support shaft provided in the main body of the apparatus and parallel to the drive shaft, and a support shaft provided in the support shaft, angularly displaceable around the axis of the support shaft, and having a drive portion engaging with the drive shaft. The holding member is switched to the mounting position or the insertion / ejection position, and the cam member has a blocking portion that blocks angular displacement exceeding the range between the mounting position and the insertion / ejection position, and the cam member is driven to perform the angular displacement. Cam driving means, a detecting means for detecting whether or not the stopping position is blocked by the blocking portion according to the angular displacement state of the cam member, and a cam driving means at the stopping position in response to the output of the detecting means. By A recording medium for a reproducing / recording apparatus, comprising: a control unit for controlling the driving of the cam member and a buffer unit for absorbing an impact when the cam member is prevented from being angularly displaced by the blocking unit. Clamp mechanism. 4. The recording medium clamp mechanism of a reproducing / recording apparatus according to claim 3, wherein the buffering means is formed by giving elasticity to the blocking portion of the cam member.