JPH0210638Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a lid opening/closing mechanism using a cam mechanism, which is suitably used as a means for opening/closing a lid of, for example, a disc playback device.

BACKGROUND ART A permanent magnet piece is fixed to the tip of a lid of a conventional disc playback device, etc., and a metal piece that magnetically attracts this magnet piece is buried on the main body facing the lid. The tensile force of this magnet allows the lid to remain closed and prevents dust from entering. A torsion spring is provided at the pivot point between the lid and the main body, and the torsion spring constantly biases the lid in the opening direction. The spring force of the torsion spring is selected to be smaller than the tensile force between the magnet piece and the metal piece, so that in order to open the closed lid by a separation operation, the close magnet piece must be separated from the metal piece. need to be separated.

Therefore, a cam mechanism 1 shown in FIG. 1 has been conventionally used. A through hole 4 is formed in the lower guide member 3 of the lid body 2, and an upper end portion 6 of a vertically extending movable rod 5 that is loosely inserted into the through hole 4 is detachably disposed on the lid body 2. be done. A roller 8 as a follower is rotatably attached to the lower end 7 of the movable rod 5, and a substantially step-shaped cam 9 is provided below the roller 8 so as to be movable toward the arrow 10. cam 9
The cam surface 11 includes a first horizontal cam surface 12, a second inclined cam surface 13 that is continuous with the first horizontal cam surface 12 and slopes upward in FIG. The third horizontal cam surface 14 is continuous with the two inclined cam surfaces. When the cam 9 is moved toward the arrow 10 by a drive means (not shown), the roller 8 runs on the cam surface 11 and moves the moving rod 5.
is displaced upward. As a result, the lid body 2 moves to the moving rod 5.
It is possible to push up the permanent magnet piece 15 fixed to the lid 2 from the metal piece 16 embedded in the support plate 3 by pushing up the upper end 6 of the permanent magnet piece 15 .

In such conventional technology, the roller 8 that is moved in the vertical direction by the cam is subjected to a component force F in the vertical direction.
At the same time, a component force F1 in the horizontal direction is applied, causing the movable rod 5 to become distorted, and therefore the movable rod 5
It was not possible to achieve smooth vertical movement.

Purpose The purpose of the present invention is to solve the above-mentioned technical problems and to provide a lid body using a cam mechanism that can smoothly move a moving bar by reducing the component force acting along the moving direction of the cam surface. and to provide an opening/closing mechanism.

Composition of the Invention The present invention includes a follower 37, a cam 52 having a cam surface 54 with which the follower 37 comes into contact, and a cam 52 that can move the follower 37 in the direction toward and away from the cam surface 54 and is movable in the direction of movement of the cam surface 54. holding members 66 and 67 that are rotatably held so as to prevent the cam surface 54 from moving toward or away from the cam surface 54 in accordance with the displacement of the follower 37 in the direction toward or away from the cam surface 54; This is a lid opening/closing mechanism using a cam mechanism, characterized in that the lid 21 is opened and closed by displacement of the moving rod 35.

Embodiment FIG. 2 is a perspective view of an embodiment of the present invention.
The lid 21 of the disc playback device 20 is
2 is mounted on the main body 22 by hinges 23 and 24, and a torsion spring 26 is provided at this pivot portion 25. The lid body 21 is resiliently biased toward the arrow mark 27 by the torsion spring 26 . Permanent magnet pieces 28 and 29 are fixed to the end of the lid body 21 on the opposite side from the pivot portion 25 with a space therebetween. Magnet pieces 28 and 29 are placed on the main body 22 facing the lid 21.
Metal pieces 30 and 31 that magnetically attract each other are individually embedded. Close the lid 21 and remove the magnet pieces 28 and 29.
When the metal pieces 30 and 31 are brought into close contact with each other, the lid body 21 is maintained in a closed state by the mutual magnetic force. A switch 33 is provided on the front side of the main body 22 (on the near side in FIG. 2), and a cam mechanism 34 according to the present invention that is interlocked with the switch 33 is loaded into the main body 22. Cam mechanism 3
4, the upper end portion 36 of the moving rod 35, which is movable in the vertical direction in FIG. 2, is detachably disposed on the lid body 21.

3 is an exploded perspective view of the cam mechanism 34 according to the present invention, FIG. 4 is a side view thereof, and FIG. 5 is a sectional view taken along the section line - in FIG. 4.
This cam mechanism 34 basically includes a moving rod 35 extending in the vertical direction, a roller 37 as a follower that is integrally attached to the moving rod 35, and a cam 51 that is movable in one direction and is in contact with the roller 37. Surface 52
and arms 66, 6 as supporting members that support the roller 37 in the direction opposite to the moving direction of the cam 51.
7. A base frame 44 having an inverted U-shaped cross section is integrally attached to the lower end portion 43 of the moving rod 35 that is loosely inserted into the through hole 42 of the guide member 41 . The base frame 44 includes a connecting portion 45 fixed to the lower end 43 of the moving rod 35 and located in a plane perpendicular to the moving rod 35;
It consists of leg parts 46 and 47 extending downward in FIG. 3 from both ends of the connecting part 45 in the longitudinal direction. leg portion 46,
Elongated holes 48 and 49 extending in the width direction are formed in each of the holes 47 . Both ends of a support shaft 50 extending between the legs 46 and 47 are loosely inserted into the long holes 48 and 49. A cylindrical roller 37 is fitted into the center of the support shaft 50. A substantially step-shaped cam 51 is provided below the roller 37 in FIG. 3, and the roller 37 comes into contact with a cam surface 52 of the cam 51.

The cam surface 52 includes a first horizontal cam surface 53, a second inclined cam surface 54 that is continuous with the first horizontal cam surface 53 and slopes upward in FIG. It consists of an inclined cam surface 54 and a continuous third horizontal cam surface 55. Second inclined cam surface 5
An arrow mark 57 is provided at one longitudinal end of the cam 51 facing the arrow 4 by an electromagnetic plunger 56 as a driving source.
One end of the iron rod 58, which is movable toward the left side in FIG. 4, is fixed. One end of a coil spring 9 arranged in line with the iron rod 58 is fixed to the other end of the cam 51 in the longitudinal direction, and the other end of the coil spring 59 is fixed to a fixed wall 60 . The coil spring 59 causes the cam 51, which has moved toward the arrow 57 due to the excitation of the electromagnetic plunger 56, to be pulled back in the direction opposite to the arrow 57 when the current in the electromagnetic plunger 56 is stopped.

The arrow mark 57 of the cam 51 that can reciprocate in this way
A holding member 61 having an L-shaped cross section is arranged on the upstream side along the moving direction shown by. Holding member 6
1 is an extension part 6 fixed to a fixed wall (not shown)
2, and a rising portion 63 connected to the extending portion 62. Both ends 64 and 65 in the width direction of the rising portion 63
includes two arms 66 extending laterally in parallel;
Each end 68, 69 of 67 is rotatably attached. Therefore, the two arms 66 and 67 can be angularly displaced about the mounting shaft 70 of the rising portion 63 in the direction toward and away from the vertical cam surface 54 in FIG. Further, the length of the rising portion 63 in the width direction is selected to be larger than the length of the cam 51 in the width direction, so that the two arms 66, 67
can be angularly displaced across both sides of the cam 51 in the longitudinal direction.

Each other end 7 of arms 66 and 67 extending in parallel
1 and 72 are rotatably fitted into support shafts 50 between the roller 37 that abuts the cam surface 52 of the cam 51 and the legs 46 and 47 of the base frame 44, as shown in FIG. By integrally attaching the ends 71 and 72 of the arms 66 and 67, which are angularly displaceable, to the roller 37, the roller 3
7, only displacement in the vertical direction (approaching/separating direction of the cam surface 54) in FIG. 4 is permitted.

When the cam 51 reciprocates in the left-right direction in FIG. 4 (the direction of movement of the cam surface 54) by the action of the electromagnetic plunger 56 and the coil spring 59,
The roller 37 sequentially runs on the first horizontal cam surface 53, second inclined cam surface 54, and third horizontal cam surface 55.
Although the roller 37 receives both the vertical component force F2 and the horizontal component force F3, only the vertical component force F2 acts on the roller 37 due to the action of the arms 66 and 67. Therefore, the movable rod 35 that moves up and down integrally with the roller 37 also has a component force in the up and down direction.
Since only F2 is received, the movable rod 35 supported by the guide member 41 is not strained, and therefore, smooth vertical movement of the movable rod 35 can be achieved. Moreover, by eliminating the twisting of the moving rod 35, the cam 51
Therefore, the driving force of the cam 51 can be selected to be small, and the present cam mechanism 3
4. Work efficiency can be improved. Further, this cam mechanism 34 is effective when the thickness of the guide member 41 that supports the movable rod 35 so as to be movable in the vertical direction is selected to be small, and when the guide member 41 and the roller 3
This can be suitably implemented when the length of the moving rod 35 up to 7 is selected to be large.

Referring again to FIG. 2, with the lid 21 closed, when the switch 33 linked to the cam mechanism 34 is operated to move the moving rod 35 upward in FIG. is pushed up slightly by the upper end 36 of. Due to the upward displacement of the moving rod 35, the permanent magnet pieces 28, 29 of the lid 21 and the main body 2
When the metal pieces 30 and 31 of 2 are separated, the lid 2
1 is fully opened by the torsion spring 26.
By operating the switch 33 and moving the moving rod 35 downward in FIG. 2, the magnet pieces 28, 29 and the metal pieces 30, 31 can be brought into close contact with each other when the lid 21 is closed again.

FIG. 6 is an exploded perspective view of another embodiment of the present invention. FIG. 6 is similar to the structure of FIG. 3, and corresponding parts are given the same reference numerals. It should be noted that each end 68, 69 of the parallel arms 66, 67 has a long hole 7.
5 and 76, and the protrusions 77 and 78 that engage with the long holes 75 and 76 are connected to the legs 8 of the inverted U-shaped base frame 79.
0.81. This simplifies the structure of the base frame 79 and improves the productivity of the cam mechanism 34.

Although the cam mechanism 34 according to the present invention is used as a means for opening and closing the lid 21 of the disc playback device 20, it can be implemented in a wide range of other technical fields.

The cam 51 is not limited to a substantially rectangular cam as in the above-mentioned embodiments, but may also be a circular cam, for example.

Effects As described above, according to the present invention, the follower is supported so as to be movable in only one direction by the arm that can be angularly displaced around the axis. can be facilitated.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the prior art, FIG. 2 is a perspective view of an embodiment of the present invention, FIG. 3 is an exploded perspective view of a cam mechanism 34 according to the present invention, and FIG. 4 is a partial cross-section thereof. Side view, Figure 5 is the cutting plane line of Figure 4 -
FIG. 6 is an exploded perspective view of another embodiment of the present invention. 1, 34... cam mechanism, 5, 35... moving rod,
8,37... Holoa, 9,51... Cam, 11,
52...Cam surface, 61...Holding member, 66, 6
7,83...Arm.

Claims (1)

[Claims for Utility Model Registration] A follower 37; a cam 52 having a cam surface 54 with which the follower 37 comes into contact; Holding members 66 and 67 are rotatably held so as to prevent movement, and are movable in the direction toward and away from the cam surface 54 in response to the displacement of the follower 37 in the direction toward and away from the cam surface 54. A lid opening/closing mechanism using a cam mechanism, comprising a guided moving rod 35, and opening/closing the lid 21 by displacement of the moving rod 35.