JPS6312269Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention uses rotational movement and lift (reciprocating) in the output member.
The present invention relates to a cam device that performs a compound motion, and more specifically to a cam device used in various automatic machine tools.

Conventionally, this type of cam device was patented in the U.S. Patent No.
The one related to No. 4036374 is publicly known. In this known cam device, an input shaft is rotatably supported in a housing, a globoidal cam is fixed on the input shaft, and a tapered rib forming a predetermined geometric curve is provided on the circumferential surface of the globoidal cam. A cam groove having a predetermined geometric curve is cut into one end surface of the same globoidal cam. In addition, an output shaft facing the globoidal cam and perpendicular to the input shaft is rotatably supported in the housing and movably in the axial direction, and a follower turret is integrally mounted on the circumferential surface of the output shaft. A cam follower is provided on the circumferential surface of the follower turret to sandwich the tapered rib of the globoidal cam from both sides. Further, a trochanter rotatably attached to an arm rotatably supported by the housing is fitted into the cam groove formed on one end surface of the globoidal cam, and the tip of this arm is connected to the other end. It is connected to the output shaft via a trochanter.

In this cam device, the output shaft is rotated by the rotation of the globoidal cam and the action of the cam follower that clamps the tapered rib, and the output shaft is moved in the axial direction by the action of the cam groove, arm, and trochanter. This allows the output shaft to perform a combined rotational and linear motion.

However, in this known cam device, when the output shaft moves in the axial direction, the follower turret also moves in the axial direction. As a result, the range in which the output shaft can perform a combined rotational motion and linear motion is limited to an extremely narrow range. Furthermore, during this compound movement, the taper rib formed on the outer peripheral surface of the globoidal cam is formed at an angle with respect to the circumferential direction, but in order for the output shaft to move in the axial direction, the taper rib is formed on the outer peripheral surface of the globoidal cam. The cam followers that clamp the ribs must move in the tangential direction of the globoidal cam, making it extremely difficult to accurately control the compound motion of the output shaft.

The present invention was developed in view of the above-mentioned problems, and its purpose is to create a cam device that can accurately perform complex compound movements such as continuous rotational movement and long-stroke linear movement of the output shaft. is to provide.

In order to achieve the above object, the present invention includes a hollow cylindrical follower shaft that is perpendicular to the input shaft of the conventional cam device and is rotatably supported in the housing while being immovably supported in the axial direction. A follower turret having a cam follower is integrally fixed on the outer periphery of the follower shaft, and the follower shaft supports the output shaft by spline engagement so as to be able to slide freely in the axial direction inside the follower shaft. The end of the arm is swingably supported by the housing and has a trochanter that engages with a groove on one end face of the globoidal cam, and the end portion of the arm is connected via another trochanter.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the cam device of the present invention, and FIG. 2 is a cross-sectional view thereof. connected input shaft 2,
A globoidal cam 3 whose axis is fixed on the input shaft 2, a geometrically curved taper rib 3a integrally formed on the outer peripheral surface of the globoidal cam 3, and an endlessly carved tapered rib 3a on one end surface of the globoidal cam 3. an output shaft 9 that is perpendicular to the groove 4 and the input shaft 2 and is supported within an opening in the upper surface of the housing 1 so as to be rotatable and axially movable (lift motion); Lower spline section 13
A hollow cylindrical member that is coaxially engaged with the outer periphery of the output shaft via a ball bearing 14 to slidably support the output shaft 9 in the axial direction, and is forced to rotate integrally with the output shaft by the spline portion 13. Follower shaft 10 of
, a follower turret 11 integrally formed at one end of the follower shaft 10, a pair of cam followers 12 supported on the outer peripheral surface of the turret 11 and rotatably sandwiching the tapered rib 3a from both sides, and the follower shaft 10. 1
0 rotatably supported in the housing 1 via a bearing 17 while being immovably supported in the axial direction; It has a cylindrical cap body 19 that rotatably and slidably supports the upper non-spline portion. At the lower end of the spline portion 13 of the output shaft 9, there is provided a guide member 1 having an annular groove 15 on the circumferential surface.
6 are integrally formed coaxially. Reference numeral 5 denotes an arm, one end of which is connected to the housing 1 by a shaft 6.
The first trochanter 8 is supported in a swingable manner at the other end.
are rotatably mounted, and the first trochanter 8 is rotatably fitted into the annular groove 15 of the guide member 16 .
Further, a second trochanter 7 is rotatably mounted approximately at the center of the arm 5, and the trochanter 7 is rotatably fitted into a groove 4 formed on one end surface of the globoidal cam 3. There is. In the illustrated example, the tapered rib 3a of the globoidal cam is configured for rocking rotation, and the groove 4 is configured for vertical movement. Therefore, when the globoidal cam 3 rotates after receiving the driving torque of the input shaft 2, the taper rib 3a
The oscillating rotational motion is transmitted to the follower shaft 10 and the output shaft 9 via the pair of cam followers 12,
Further, vertical movement in the axial direction is transmitted to the output shaft 9 via the arm 5 and the guide member 16 which are engaged in the groove 4 via the rotor 7.

Since the present invention is configured as described above,
When the input shaft 2 rotates in the direction of arrow A, the cam 3 also rotates together with it. The cam follower 12 press-fits into the tapered rib 3a on the circumferential surface of the cam 3 from both sides, and when the cam 3 rotates, the tapered rib 3a
a, and is guided by the geometrical curved shape of the tapered rib 3a to swing in the direction of arrow B in FIG. 2, so that the turret 11 swings and rotates integrally with this. The rotational motion of the turret 11 and the follower shaft 10 is transmitted to the spline section 13 and the output shaft 9 which is integrated with the spline section 13 in the rotational direction, causing the output shaft 9 to swing and rotate.

Further, when the groove 4 rotates due to the rotation of the cam 3, the second trochanter 7, which is rotatably fitted in the groove 4, is guided by the curved shape of the groove 4 and is displaced in the vertical direction. This vertical movement of the trochanter 7 causes the arm 5 to move towards the shaft 6.
The output shaft 9, which is engaged with the tip of the arm via the first trochanter 8 and the guide member 16, is reciprocated in the axial direction.

In the cam device according to the present invention, the output shaft 9 performs a compound movement of vertical movement and rocking rotation by the globoidal cam 3 rotated by the input shaft 2, but the vertical movement in the illustrated embodiment is The relationship between this and the oscillating rotational motion is shown in FIG. The timing diagram in Figure 3 can be compared to Figures 1 and 2.
This will be explained below with reference to the figures. Figures 1 and 2
The state shown in the figure is a state in the middle position of the section d to e or the middle position of the section j to k in FIG. 3, and will be described here assuming that it is in the middle position of the section d to e. In the small-diameter arc portion indicated by reference numeral 4a in FIG. 1, even if the input shaft 2 rotates in the direction of arrow A, the second trochanter 7 is always located at the same distance from the input shaft 2, so the arm 5 cannot move up and down. First, the output shaft 9 is located at the top. However, in the section from d to e, the pair of cam followers 12
Since the output shaft 9 is passing through the curved portion of , the output shaft 9 is rotating clockwise. Next, in the e-f section, trochanter 7
passes through the small-diameter arc portion 4a and reaches the protrusion 4b in front of the large-diameter arc portion 4c, so the arm 5 rotates downward and lowers the output shaft 9. At this time, the output shaft 9
continues to rotate clockwise. In the section f to g, the trochanter 7 is still on the protrusion 4b, so the descending movement continues, and when it reaches the large diameter arc part 4c (position g)
to end the descent. In this section, the cam follower 12 enters the straight part of the tapered rib 3a, so its rotational movement is stopped. In the section g to h,
Since the trochanter 7 rolls along the large-diameter arc portion 4c (because the radius between it and the input shaft 2 is the same distance over the entire length of the large-diameter arc portion), the output shaft 9 stops at the lowest position. There is. Further, in this section, the rotational movement is also in a stopped state. In the h-i section, the large diameter arc portion 4c passes the trochanter 7 and the protrusion 4d comes to the position of the trochanter 7, so the output shaft 9 starts to rise, but the rotation remains stopped. In the section i to j, the output shaft 9 continues to rise because the trochanter 7 is still on the protrusion 4d, and ends its rise just before the small diameter arc part 4a at the top of FIG. 1 (position j). In this section, cam follower 1
2 starts rotating counterclockwise to reach the curved part of the tapered rib 3a on the opposite side (left side in FIG. 2). In the section j to k, the trochanter 7 rolls on the small diameter arc portion 4a and therefore does not move up and down. However, the counterclockwise rotational movement continues. k~
In section l, the trochanter 7 reaches the protrusion 4b, so the output shaft 9 descends again and continues to rotate counterclockwise. In the l-m section, the trochanter 7 is still on the protrusion 4b, so the descending movement continues, but the rotational movement stops at the l position. In the section m to n, both the vertical movement and the rotational movement stop, and this state continues until position b. The upward movement starts from position b and continues until position d, while the rotational movement in the clockwise direction starts from position c and continues until position f. In the vertical movement and rocking rotation movement of the output shaft 9, sections c to d, e to
In f, i to j, and k to l, the vertical movement and the oscillating rotation overlap, and the output shaft 9 rises or falls while rotating. It can make you exercise.

By changing the shapes of the tapered ribs and grooves as appropriate, the output shaft can be used in various ways, such as not only vertical movement and oscillating rotational movement at different timings depending on the use, but also intermittent rotational movement accompanied by vertical movement. It is possible to perform complex movements.

As described above, in the cam device according to the present invention, the hollow cylindrical follower shaft is rotatably supported in the housing, but is supported immovably in the axial direction, and the follower shaft supports the output shaft in the axial direction inside the follower shaft. A follower turret that is slidably supported by spline engagement and has a cam follower on the outer periphery of the follower shaft is integrally fixed, and this cam follower is engaged with a tapered rib of a globoidal cam fixed to the input shaft. Therefore, by the rotation of the globoidal cam, the inner output shaft can be freely rotated continuously or intermittently at a constant speed or an inconstant speed via the follower shaft.

On the other hand, it is connected via a trochanter to one end of an arm that is swingably supported by the end housing of the output shaft.
Since this arm is engaged with a groove on one end surface of the globoidal cam via another rotor, the output shaft moves continuously or intermittently within the follower shaft at a constant or unequal speed depending on the shape of this groove. It can move linearly in the axial direction at high speed. Since the slave shaft only rotates at a predetermined position, the axial engagement position between the tapered rib of the globoidal cam and the cam follower of the slave shaft does not change due to the axial movement of the output shaft. , the axial stroke of the output shaft can be increased, and the output shaft can accurately perform a complex compound motion of rotational motion and linear motion.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a cam device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the cam device, and FIG. 3 is an explanatory diagram of the operation of the cam device. 1...Housing, 2...Input shaft, 3...Globoidal cam, 3a...Tapered rib, 4...
groove, 5... arm, 7... second trochanter, 8... first
Trochanter, 9... Output shaft, 10... Follower shaft, 11...
Follower turret, 12... Cam follower, 13
...spline section.

Claims (1)

[Scope of utility model registration request] An input shaft is rotatably supported in the housing, a single globoidal cam is fixed on the input shaft, and a tapered rib forming a predetermined geometric curve is provided on the circumferential surface of the globoidal cam. A groove having a predetermined geometric curve is carved in the end face, and a hollow cylindrical follower shaft perpendicular to the input shaft is rotatably supported in the housing while being immovably supported in the axial direction. A follower turret is integrally fixed on the outer periphery of the follower shaft, and cam followers are provided on the circumferential surface of the follower turret that sandwich the tapered ribs of the globoidal cam from both sides, and the follower shaft has an output on the inside thereof. The shaft is supported by spline engagement so as to be able to slide freely in the axial direction, and a trochanter attached to an arm that is swingably supported by the housing is engaged in the groove, and the distal end of the arm is engaged. is connected to the end of the output shaft via another trochanter, and when the globoidal cam rotates, the cam follower rolls along the tapered rib, thereby increasing the output via the follower shaft. At the same time as applying rotational motion to the shaft, the rotor rolls in the groove, so that the output shaft is reciprocated in the axial direction within the slave shaft via the arm. A cam device featuring: