JPH11247958A - Cam mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple cam mechanism which can vertically move shank parts serving as a follower, and which can repeat an inclined return as a new motion. SOLUTION: A cam contact member 5 is fixed to the lower end of each shank member 3 which is attached to a frame 1 so as to be vertically reciprocatable and tiltable, and cams 7 are fixed to rotary drive shafts 10 attached to the lower part of the frame 1. In this arrangement, when the cam 7 periodically changing its contact position makes contact with the cam contact members 5 at a position which is off from an extension of the shank member 3, the shank member 3 is inclined from the vertical direction thereof under gravitation. Thereafter, the shank member 3 is returned into the vertical direction so as to reciprocate vertically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cam mechanism.
More specifically, the present invention relates to a cam mechanism in which a shaft member repeats a tilt return to a vertical direction of the shaft member while moving up and down.

[0002]

2. Description of the Related Art Conventionally, various types of cam mechanisms have been used for machines and toys. Particularly, cam mechanisms using a planar cam have been widely used for toys for infants because of their simple structure. I have. The cam transmits power while the moving side, that is, the "primary section" and the moved side, that is, the "follower" are in direct contact with each other, and is divided into a planar cam and a three-dimensional cam. One of the planar cams that is frequently used is a “plate cam”. However, many conventional plate cams move the follower up and down, and the contact point between the original and the follower is often limited to a relatively narrow range.

[0003]

For this reason, it was possible to give various variations to the up-and-down movement of the follower, but a mechanism for adding another movement to the follower in addition to the up-and-down movement There was no. Therefore, the object of the present invention is to
It is an object of the present invention to provide a cam mechanism capable of repeating a shaft member as a follower moving up and down and a new movement of tilt return by an extremely simple cam mechanism.

[0004]

According to a first aspect of the present invention, there is provided:
2. The cam according to claim 1, wherein the shaft member is attached to the frame such that the shaft member can reciprocate up and down and can be inclined in a predetermined direction, and a laterally extending cam is provided at a lower end of the shaft member and substantially perpendicular to the shaft member. A contact member is fixed, and a cam having an external shape such that the contact position with the cam contact member moves vertically while moving up and down and is periodically repeated is fixed to a rotation drive shaft rotatably mounted at the lower portion of the frame. When the cam comes into contact with the cam contact member at a position off the axis center line of the shaft member, the shaft member tilts obliquely from the vertical direction due to gravity, and then the shaft member returns to the vertical direction and reciprocates vertically. It is characterized by exercising.

According to a second aspect of the present invention, in the cam mechanism according to the first aspect, a doll is placed on a shaft member, and the doll is reciprocated up and down by driving a rotary drive shaft, and sometimes bows forward. Is driven in such a manner.

According to a third aspect of the present invention, in the cam mechanism according to the first aspect, a notch formed in the outer peripheral surface of the shaft member to form an axial projection and corresponding to a hole of a frame for receiving the shaft member. And the shaft member is prevented from rotating.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of a cam mechanism according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a cam mechanism according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing a drive mechanism for driving the cam mechanism shown in FIG. 1 by a music box movement, and FIG. It is sectional drawing of the cam mechanism of FIG.

In the embodiment shown in the drawings, a frame 1 serving as a base and a movement 13 of a music box as power for driving a cam mechanism according to the present invention are provided.
The frame 1 is provided with a through hole 9 for allowing the shaft member 3 to pass through. The through hole 9 has substantially the same shape as the outer shape of the shaft member 3, and can be inserted with a slight play so that the shaft member 3 can reciprocate up and down and tilt in a predetermined direction. It is pierced so that it becomes.

When the shaft member 3 is cylindrical, the shaft member 3 is rotated when the shaft member 3 is inserted into the through hole 9, and the cam contact member 5 may come off the cam 7. There is. Therefore, the shaft member 3 is vertically
In addition, a notch 9a is provided in the play hole 9 and the protrusion 3a is caught by the notch 9a to prevent the shaft member 3 from rotating. In addition,
The shaft member 3 is not limited to a columnar shape, and may be a polygonal column. In this case, the shaft member 3 does not need to be provided with the projection 3a or the cutout 9a, but depending on the shape of the polygonal column, the shaft member 3 rotates. Therefore, it is necessary to appropriately provide the projection 3a and the notch 9a.

The shaft member 3 is provided with the projection 3a in the vertical direction as described above, and a cam contact member 5 for transmitting the movement of the cam 7 to the shaft member 3 is provided at the lower end of the shaft member 3. Is attached. The cam contact member 5 is fixed so as to be substantially perpendicular to the shaft member 3 and substantially perpendicular to the rotary drive shaft 10. A groove 5a slightly wider than the width of the cam 7 is recessed at a portion of the bottom surface of the cam contact member 5 that contacts the cam 7.
The end of the cam 7 moves along the groove 5a. In addition,
Usually, a doll or the like is attached to the opposite end of the shaft member 3.

The cam 7 is mounted on a rotary drive shaft 10 rotatably mounted on the lower portion of the frame 1, and a rotary gear 11 is mounted on one end of the rotary drive shaft 10. The rotation drive shaft 10 rotates through the rotation gear 11 when the music box movement 13 is driven.

The cam 7 has such an outer shape that the contact position with the cam contact member 5 moves in the horizontal direction while periodically moving up and down, and comes off the extension of the shaft member 3. Specifically, it is a polygon such as a triangle or a quadrangle, or a star shape having a predetermined number of apexes.

In this embodiment, a plurality of cams 7 are mounted on a rotary drive shaft 10 and the rotary drive shaft 10 is
Are provided. At this time, if the cams 7 having the same shape are all mounted in the same state, the movements of the shaft members 3 are all the same, so that the movement of the doll attached to the tip of the shaft member 3 is the same. On the other hand, when the cams 7 are attached in different states, the movement of the shaft members 3 varies, and the movement of the doll also varies accordingly.

Next, the operation of the cam mechanism according to the present invention will be described. First, the movement gear 15 is rotated by the power of the mainspring of the music box movement 13, which is a power source. As a result, the rotation gear 11 attached to the end of the rotation drive shaft 10 meshed with the movement gear 15 rotates, and the rotation drive shaft 10 rotates.
With this rotation, the cam 7 axially mounted on the rotary drive shaft 10
Rotates.

When the cam rotates seven times, the top of the cam 7 pushes the bottom surface of the end of the cam contact member 5 to push up the shaft member 3. At this time, since the idle hole 9 is bored with a slight play, the shaft member 3 is inclined in the opposite direction to the portion where the cam and the end bottom surface of the cam contact member 5 are in contact. Becomes Accordingly, with this movement, the doll 6 attached to the shaft member 3 moves as if to bow.

Further, when the cam 7 rotates, the top of the cam 7 further pushes up the cam contact member 5, and the shaft member 3 is pushed up. Thereafter, as the top of the cam 7 moves vertically across the bottom of the cam contact member 5, the shaft member 3 is lowered by gravity, and the shaft member 3 is inclined in a direction opposite to the direction described first.

Thereafter, with the rotation of the rotary drive shaft 10, a different top portion pushes the bottom surface of the end of the cam contact member 5,
By pushing up the shaft member 3 and sequentially repeating this, the doll 6 attached to the end of the shaft member 3 repeats a reciprocating motion in the vertical direction while tilting.

[0018]

According to the cam mechanism according to the present invention, as described above, the motion of repeating the tilt return while moving the shaft member up and down can be realized by a very simple mechanism. If a doll or the like is attached to the tip of the shaft member, a unique movement can be given to the doll. That is, if the arrangement of the plurality of cams attached to the rotary drive shaft is exactly the same, the doll attached to the tip of the shaft member will perform the same orderly movement. On the other hand, if the positions of the cams are relatively different from each other, the movement of the doll becomes cluttered. Therefore, the movement of the doll can be controlled by how the position of the cam is attached, so that a unique movement can be expressed by a combination of the movements. Furthermore, if a projection in the axial direction is formed on the outer peripheral surface of the shaft member and a cutout portion corresponding to the hole of the frame is formed, the rotation of the shaft member can be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a cam mechanism according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a drive mechanism for driving the cam mechanism shown in FIG. 1 by a music box movement.

FIG. 3 is a sectional view of the cam mechanism of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 3 Shaft member 3a Projection 5 Cam contact member 7 Cam 9 Free through hole 9a Notch 10 Rotation drive shaft 11 Rotation gear 13 Music box movement 15 Music box movement gear

Claims (3)

[Claims] 1. A cam contact member which is attached to a frame so as to be able to reciprocate up and down and tilt in a predetermined direction with respect to a frame, and which extends laterally at a lower end of the shaft member and substantially orthogonal to the shaft member. Is fixed, and a cam having an external shape that moves in the horizontal direction while the contact position with the cam contact member moves up and down and repeats this periodically is fixed to a rotation drive shaft rotatably mounted at the bottom of the frame, When the cam comes into contact with the cam contact member at a position off the axis center line of the shaft member, the shaft member tilts obliquely from the vertical direction due to gravity, and then the shaft member returns to the vertical direction and moves up and down. A cam mechanism characterized by reciprocating motion. 2. The cam mechanism according to claim 1, wherein a doll is placed on the shaft member, and the doll is reciprocated up and down by driving a rotary drive shaft, and is sometimes driven to bow forward. Features a cam mechanism. 3. The cam mechanism according to claim 1, wherein an axial projection is formed on an outer peripheral surface of the shaft member, and a notch corresponding to a hole of a frame for receiving the shaft member is formed. A cam mechanism wherein the shaft member is prevented from rotating.