JPH1163144A - Parallel cam device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a parallel cam device whose constitution is simple and which is easily assembled. SOLUTION: A parallel cam device has a single cam 10 fixed to an input shaft 40 and a single turret 30 which is fixed to an output shaft 80 and on which plural rollers 20, 22, 24 and 26 are installed. A cam surface of the cam 10 restricts the turret 30 by always contacting with two or more rollers among the plural rollers 20, 22, 24 and 26 installed on the turret 30. When the input shaft 40 rotates, the cam 10 rotates the turret 30 and the output shaft 80 by contacting with the rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel cam device, and more particularly, to a parallel cam device suitable for use as a mechanism for providing an intermittent motion or the like.

[0002]

2. Description of the Related Art In various industrial machines, various mechanisms for providing intermittent motion are used. 2. Description of the Related Art In the field of electric and electronic automatic machines, for example, in a chip mounter or the like, a mechanism for providing intermittent motion for intermittently feeding chip components is used. Also, in the field of food and medical automatic machines, a mechanism for providing intermittent motion is used to intermittently feed bottles in the process of bottling food and medicine such as oil and soy sauce. In addition, mechanisms for providing intermittent motion are widely used in various machines, automatic machines such as clothing and packaging, machine tools such as machine tools, robots, and the like.

Conventional mechanisms for providing intermittent motion include, for example, a toothless gear, a ratchet, a Geneva, and the like. However, these mechanisms cannot remove backlash or have discontinuous acceleration. Therefore, it is not suitable for high-speed exercise. As a mechanism that solves these problems, a parallel cam device using a parallel cam is generally known.

A parallel cam device is suitable for high-speed movement because backlash can be eliminated and acceleration is continuous. A general configuration of a parallel cam device includes two cams fixed to an input shaft and two turrets fixed to an output shaft. A plurality of rollers are provided in the outer peripheral direction of each turret. It is rotatably supported. In the parallel cam device, the cam surface of the first cam contacts a roller supported by the first turret, and the cam surface of the second cam contacts a roller supported by the second turret. By doing so, the continuous rotary motion of the input shaft is converted into intermittent rotary motion of the output shaft.

[0005]

However, the conventional parallel cam apparatus has a problem that its mechanism is complicated because two cams and two turrets are used as described above. . In addition, since the cam shapes of the two cams need to be exactly the same, machining accuracy is required, and when attaching the two cams to the input shaft, a predetermined phase relationship must be maintained. Therefore, phase matching at the time of assembly has been difficult. Also,
The turret drilling process also has alternately deep holes, so a long tool must be used, and it is difficult to achieve high processing accuracy.

An object of the present invention is to provide a parallel cam device which has a simple structure and is easy to manufacture.

[0007]

[Means for Solving the Problems]

(1) In order to achieve the above object, the present invention includes one cam fixed to an input shaft, and one turret fixed to an output shaft and having a plurality of rollers attached thereto, The cam surface of the cam is always in contact with two or more rollers of the plurality of rollers attached to the one turret to restrain the turret, and with the rotation of the input shaft, the cam is The turret and the output shaft are rotated in contact with the roller. With such a configuration, the cam and the turret are
Since each is one, the configuration is simplified, and the phase matching of two turrets as in the related art is not required, so that the turret can be easily manufactured.

(2) In the above (1), preferably,
The cam surface of the cam has a stop angle portion that does not accompany the rotational displacement of the output shaft with respect to the rotational displacement of the input shaft. With this configuration, the output shaft does not rotate in the stationary angle portion, so that the rotation of the output shaft can be intermittently performed with respect to the rotation of the input shaft, and an intermittent motion can be given.

(3) In the above (1), preferably,
The plurality of rollers are composed of two sets of four rollers, the first set of two rollers is arranged point-symmetrically with respect to the center of the output shaft to which the turret is attached, and the second set is provided. Are also arranged point-symmetrically with respect to the center of the output shaft to which the turret is attached. With such a configuration, the turret may be formed symmetrically, and the turret can be easily manufactured.

(4) In the above (3), preferably,
The diameter of the first set of rollers is greater than the diameter of the second set of rollers. With such a configuration, since the diameter of the roller is large, the load torque for restraining the turret can be increased to improve the restraining force.

(5) In the above (3), preferably,
The diameters of the four rollers are equal. With such a configuration, since rollers of the same size can be used, manufacturing costs can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A parallel cam device according to an embodiment of the present invention will be described below with reference to FIGS. First, an overall configuration of a parallel cam device according to an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, the parallel cam apparatus according to the present embodiment includes a cam 10 on an input side and a turret 30 to which four rollers 20, 22, 24, 26 on an output side are attached. The cam 10 is fixed to the input shaft 40. The input shaft 40 is connected to the first housing 70 via input shaft bearings 50 and 52 and a bearing case 60.
Is attached. That is, the cam 10 and the input shaft 4
0 is rotatably supported on the first housing 70.

The turret 40 is fixed to an output shaft 80. The output shaft 80 is connected to the second housing 72 via the output shaft bearings 54 and 56 and the bearing case 62.
It is fixed to. That is, the turret 40 and the output shaft 8
0 is rotatably supported on the second housing 72. The first and second housings 70, 72 are fixed to each other.

Next, the relationship between the cam 10 and the rollers 20, 22, 24, 26 will be described with reference to FIG. The rollers 20 and 24 are arranged point-symmetrically with respect to the center of the output shaft 80. The rollers 22 and 26 are also arranged point-symmetrically with respect to the center of the output shaft 80. The line connecting the rollers 20 and 24 is orthogonal to the line connecting the rollers 22 and 26. That is, the rollers 20, 22, 24, and 26 are turret 3
They are arranged at equal intervals of 90 ° to 0. The turret radii from the center of the output shaft to the center of each of the rollers 20, 22, 24, 26 are all equal and TR. The diameter R1 of the rollers 22 and 26 is larger than the diameter R2 of the rollers 20 and 24. Further, the input shaft 40 and the output shaft 80 are arranged in parallel to constitute a parallel cam, and the distance between the axes is L1.

On the other hand, the cam 10 has a shape as shown, and the cam surface of the cam 10 has four rollers 2.
0,22,24,26, at least two rollers are always in contact. That is, in the state shown in FIG. 2, the cam 10 is inscribed with the roller 20 at the contact point CP-A, and in contact with the roller 22 at the contact point CP-B. The cam 10 is always configured to restrain the roller at two or more points, and the backlash is removed. As will be described later, the number of contact points between the cam 10 and the rollers 20, 22, 24, 26 is not limited to two, but may be three.

When the input shaft 40 rotates in the direction of the arrow RA,
The cam 10 contacts and presses the rollers 20, 22 at the contact points CP-A, CP-B, and the turret 30 on which the rollers are mounted rotates. Accordingly, the output shaft 80 to which the turret 30 is fixed rotates in the direction of the arrow RB.

Next, the characteristics of the parallel cam device according to the present embodiment will be described with reference to FIG. In the parallel cam device according to the present embodiment, the stop angle is 30 ° and the displacement portion is a deformed constant velocity curve (MCV: Modified Constand Velocit).
y). That is, when the input axis is from 0 ° to 33
When rotated to 0 °, the output shaft rotates from 0 ° to 180 °. During this time, the input shaft rotates at a constant speed, and the output shaft rotates with a deformed constant velocity curve. Note that the initial portion where the input shaft is displaced from 0 ° is lower than the speed in the vicinity of the middle, and since the acceleration is continuous, the speed is smoothly increased. Also, at the last portion where the input shaft is displaced to 330 °, the speed is lower than the speed near the middle and the speed is smoothly stopped because the acceleration is continuous.

During the period when the input shaft rotates from 330 ° to 360 °, the output shaft does not rotate. Therefore, the displacement of the output shaft can be intermittently given to the continuous displacement (rotation) of the input shaft, and an intermittent motion can be given.

Similarly, when the input shaft is 360 ° to 690 °
When rotated to ゜, the output shaft rotates from 180 ° to 360 °. During this time, the input shaft rotates at a constant speed, and the output shaft rotates at a deformed constant speed curve. During the period when the input shaft rotates from 690 ° to 720 °, the output shaft does not rotate.

Therefore, when the input shaft rotates 720 °, the output shaft rotates 360 °, and the rotation of the output shaft stops when the input shaft in the middle ranges from 330 ° to 360 ° and 690 ° to 720 °. doing.

Next, the displacement of the cam and the turret of the parallel cam device according to the present embodiment will be described with reference to FIGS. FIG. 4 shows a state where the rotation angle of the input shaft in FIG. 3 is 0 °, and shows the same state as that shown in FIG. As shown in FIG. 4, the cam 10
Inscribed at the contact point CP-A with the roller 20,
Inscribed at the contact point CP-B with the roller 22,
The cam 10 restrains the roller at two points. The rollers 24 and 26 are not in contact with the cam 10. Therefore, when the input shaft 40 rotates in the direction of the arrow RA, the cam 10 presses the rollers 20, 22 at the contact points CP-A, CP-B, and the turret 30 and the output shaft 80 rotate in the direction of the arrow RB. Note that, for convenience of the following description, the input shaft 40
And the line connecting the center of the output shaft 80 and the center of the roller 20 is RL.

FIG. 5 shows a state at 33 ° where the rotation angle of the input shaft in FIG. 3 is 1/10 of the total rotation angle. Line CL connecting the center of the input shaft 40 and the acute point of the cam 10
1 is rotated by 33 ° with respect to the line CL shown in FIG. Also at this time, the cam 10 is inscribed with the roller 20 at the contact point CP-A1,
And at the contact point CP-B1, the cam 10
Has constrained the roller at two points. Also, during the transition from the state shown in FIG. 4 to the state shown in FIG.
Continues to restrain the roller at two points. A line RL1 connecting the center of the output shaft 80 and the center of the roller 20 is rotated by 4.5 ° with respect to the line RL shown in FIG. That is, when the input shaft 40 rotates 33 °, the output shaft 80 is displaced by 4.5 °.

FIG. 6 shows a state in which the rotation angle of the input shaft in FIG. 3 is 66 °. Center of input shaft 40 and cam 1
The line CL2 connecting the acute angle points of 0 is rotated by 33 ° with respect to the line CL1 shown in FIG. Also at this time, the cam 10 is inscribed with the roller 20 at the contact point CP-A2, and is inscribed with the roller 22 at the contact point CP-B2. Further, when the rotation angle of the input shaft becomes 66 °, the cam 10 newly contacts the roller 26 with the contact point CP.
At -D1, the cam 10 restrains the roller at three points. Also, during the transition from the state shown in FIG. 5 to the state shown in FIG. 6, the cam 10 continues to restrain the roller at two points. A line RL2 connecting the center of the output shaft 80 and the center of the roller 20 corresponds to the line R shown in FIG.
It is rotated 16.9 ° with respect to L1. That is, when the input shaft 40 rotates 66 °, the output shaft 80 is displaced by 21.4 °.

FIG. 7 shows a state where the rotation angle of the input shaft in FIG. 3 is 99 °. Center of input shaft 40 and cam 1
The line CL3 connecting the acute angle points of 0 is rotated by 33 ° with respect to the line CL2 shown in FIG. Even at this point, the cam 10 is inscribed with the roller 20 at the contact point CP-A3, is also inscribed with the roller 22 at the contact point CP-B3, and is further inscribed with the roller 26 at the contact point CP-D2. The cam 10 restrains the roller at three points. Also, during the transition from the state shown in FIG. 5 to the state shown in FIG. 6, the cam 10 continues to restrain the roller at three points. A line RL3 connecting the center of the output shaft 80 and the center of the roller 20 is different from the line RL2 shown in FIG.
It has rotated 2.7 °. That is, when the input shaft 40 rotates 99 °, the output shaft 80 rotates 44.1 °. In addition,
The contact between the cam 10 and the roller 22 is in the release direction.

FIG. 8 shows a state where the rotation angle of the input shaft in FIG. 3 is 122 °. A line CL4 connecting the center of the input shaft 40 and the acute point of the cam 10 is a line CL3 shown in FIG.
Is rotated 33 °. At this point, the cam 10 is inscribed with the roller 20 at the contact point CP-A4, and is inscribed with the roller 26 at the contact point CP-D3, and the cam 10 restrains the roller at two points. Also, during the transition from the state shown in FIG. 6 to the state shown in FIG. 7, the cam 10 continues to restrain the roller at at least two points. A line RL4 connecting the center of the output shaft 80 and the center of the roller 20 is rotated by 22.9 ° with respect to the line RL3 shown in FIG. That is, when the input shaft 40 rotates 122 °, the output shaft 80 rotates 67 °.

FIG. 9 shows a state in which the rotation angle of the input shaft in FIG. 3 is 165 °. A line CL5 connecting the center of the input shaft 40 and the acute angle point of the cam 10 is a line CL4 shown in FIG.
Is rotated 33 °. At this time, the cam 10 is inscribed with the roller 20 at the contact point CP-A5, and is inscribed with the roller 26 at the contact point CP-D4, and the cam 10 restrains the roller at two points. Also, during the transition from the state shown in FIG. 8 to the state shown in FIG. 9, the cam 10 continues to restrain the roller at two points. A line RL5 connecting the center of the output shaft 80 and the center of the roller 20 is rotated by 23 ° with respect to the line RL4 shown in FIG. That is, when the input shaft 40 rotates 165 °, the output shaft 80 rotates 90 °.

FIG. 10 shows a state where the rotation angle of the input shaft in FIG. 3 is 198 °. A line CL6 connecting the center of the input shaft 40 and the acute point of the cam 10 is a line CL shown in FIG.
It rotates 33 ° with respect to 5. At this point,
The cam 10 inscribes the roller 20 at the contact point CP-A6 and the roller 26 at the contact point CP-D5, and the cam 10 restrains the roller at two points. Also, during the transition from the state shown in FIG. 9 to the state shown in FIG. 10, the cam 10 continues to restrain the roller at two points. The line RL6 connecting the center of the output shaft 80 and the center of the roller 20 is different from the line RL5 shown in FIG.
It rotates 3 degrees. That is, when the input shaft 40 rotates 198 °, the output shaft 80 rotates 113 °.

FIG. 11 shows a state where the rotation angle of the input shaft in FIG. 3 is 231 °. A line CL7 connecting the center of the input shaft 40 and the acute angle point of the cam 10 is a line C7 shown in FIG.
It rotates 33 ° with respect to L6. At this point, the cam 10 is inscribed with the roller 20 at the contact point CP-A7, and is inscribed with the roller 26 at the contact point CP-D6, and the cam 10 restrains the roller at two points. Also, during the transition from the state shown in FIG. 10 to the state shown in FIG. 11, the cam 10 continues to restrain the roller at two points. The center of the output shaft 80 and the roller 20
Is rotated by 22.9 ° with respect to the line RL6 shown in FIG. That is, when the input shaft 40 is 2
When rotated by 31 °, the output shaft 80 is displaced by 135.9 °.

FIG. 12 shows a state in which the rotation angle of the input shaft in FIG. 3 is 264 °. A line CL8 connecting the center of the input shaft 40 and the acute angle point of the cam 10 is a line C8 shown in FIG.
It rotates 33 ° with respect to L7. At this time, the cam 10 is inscribed with the roller 20 at the contact point CP-A8, and is inscribed with the roller 26 at the contact point CP-D7, and the cam 10 restrains the roller at two points. Also, during the transition from the state shown in FIG. 11 to the state shown in FIG. 12, the cam 10 continues to restrain the roller at two points. The center of the output shaft 80 and the roller 20
The line RL8 connecting the centers of the circles is rotated by 22.7 ° with respect to the line RL7 shown in FIG. That is, when the input shaft 40 is 2
When rotated by 64 °, the output shaft 80 is rotated by 158.6 °.

FIG. 13 shows a state in which the rotation angle of the input shaft in FIG. 3 is 297 °. A line CL9 connecting the center of the input shaft 40 and the acute point of the cam 10 is a line C9 shown in FIG.
It rotates 33 ° with respect to L8. At this point, the cam 10 is inscribed with the roller 20 at the contact point CP-A9, and is inscribed with the roller 26 at the contact point CP-D8, and the cam 10 restrains the roller at two points. Also, during the transition from the state shown in FIG. 12 to the state shown in FIG. 13, the cam 10 continues to restrain the roller at two points. The center of the output shaft 80 and the roller 20
Is rotated by 16.9 ° with respect to the line RL8 shown in FIG. That is, when the input shaft 40 is 2
When 97 ° is rotated, the output shaft 80 is displaced by 175.5 °.

FIG. 14 shows a state where the rotation angle of the input shaft in FIG. 3 is 330 °. A line CL10 connecting the center of the input shaft 40 and the acute point of the cam 10 is rotated by 33 ° with respect to a line CL9 shown in FIG. At this time, the cam 10 is inscribed with the roller 20 at the contact point CP-A10, and is also in contact with the roller 26 at the contact point CP-D9.
Inscribed in In addition, Cam 1 is newly
The roller 10 is inscribed in the roller 24 and the contact point CP-C1, and the cam 10 restrains the roller at three points. FIG.
During the transition from the state shown in FIG. 14 to the state shown in FIG.
The cam 10 continues to restrain the roller at at least two points. A line RL10 connecting the center of the output shaft 80 and the center of the roller 20 is different from the line RL9 shown in FIG.
It rotates 8 °. That is, when the input shaft 40 rotates by 330 °, the output shaft 80 rotates by 180 °.

When the rotation angle of the input shaft is in the range of 330 ° to 360 °, the input shaft rotates but the output shaft stops rotating. When the rotation angle of the input shaft is 360 °, the state is the same as that shown in FIG. That is, since the input shaft is rotated by 360 °, the position of the cam 10 is the same as that shown in FIG. On the other hand, the output shaft is 180
。It is rotating. Since the rollers 20 and 24 are arranged point-symmetrically and the rollers 22 and 26 are arranged point-symmetrically, the rollers 20, 22, 24 and 26 are arranged on the roller 2.
0, 24 are in opposite positions and rollers 22, 2
As shown in FIG. 4, except that 6 are in opposite positions.

Accordingly, the line CL (FIGS. 14 and 4) connecting the center of the input shaft 40 and the acute point of the cam 10 is rotated by 33 ° with respect to the line CL10 shown in FIG. At this point, the cam 10 is in contact with the rollers 24 and 26, and the cam 10 restrains the rollers at two points. Also, during the transition from the state shown in FIG. 14 to the state shown in FIG. 4, the cam 10 continues to restrain the roller at at least two points. Since the output shaft does not rotate, the line RL10 connecting the center of the output shaft 80 and the center of the roller 20 shown in FIG. The line RL10 is at a position rotated by 180 ° with respect to the line RL shown in FIG. That is, when the input shaft 40 rotates 360 °, the output shaft 80 becomes 1
It is displaced by 80 °.

As described above, when the input shaft rotates from 0 ° to 330 ° as described in FIG. 3, the output shaft rotates from 0 ° to 180 °. During this time,
The input shaft rotates at a constant speed, and the output shaft rotates at a deformed constant velocity curve. During the period when the input shaft rotates from 330 ° to 360 °, the output shaft does not rotate. Therefore,
In response to the continuous displacement (rotation) of the input shaft, the displacement of the output shaft can be intermittently given, and intermittent motion can be given.

Here, a cam shape for stopping the rotation of the output shaft will be described with reference to FIG. Cam 10
Are the stop angle portions SA1, for stopping the rotation of the output shaft.
It has a cam surface of SA2. In the present embodiment,
Since the cam 10 always needs to be in contact with the roller 30 at least at two or more points to restrict the movement of the roller 30, the cam 10 has the cam surfaces of two stop angle portions SA1 and SA2. The radius CR1 from the center of the cam 10 (the center of the input shaft 40) to the cam surface in the stop angle portion SA1 is constant. Further, the cam 10 in the stop angle portion SA2
From the center of the shaft (the center of the input shaft 40) to the cam surface CR
2 is also constant. The diameter of the rollers 20 and 22 is
As described in FIG. 2, differently, the diameter of the roller 20 is R2 and the radius of the roller 22 is R1. Therefore, in the stop angle portions SA1 and SA2,
CR1 + (R2 / 2) = CR2 + (R1 / 2) = constant (= turret radius TR). Although the stop angle is set to 30 °, the stop angle is not limited to 30 °, and an arbitrary stop angle can be obtained by changing the angles of the stop angle portions SA1 and SA2.

In the operation angle portions MA1 and MA2 other than the stop angle portions SA1 and SA2, the relationship between the rotation angles of the input shaft and the output shaft as shown in FIG.
The shape of the cam surface of the cam 10 is determined. The cam surface shape in the operating angle portions MA1 and MA2 is
The diameters R1, R2 of 22, 24, 26 and the rollers 20,
Turret radius TR which is the mounting position of 22, 24, 26
And the target cam characteristic is determined by using the distance L1 between the input shaft 40 and the output shaft 80 as a parameter, and on condition that at least two rollers are always in contact with the cam surface. can do.

In the above description, four rollers 2
The turret radii for 0,22,24,26 are equal in TR, the diameter R2 of rollers 20,24 and roller 2
2, 26 have different diameters R1. On the other hand,
By changing the shape of the cam 10, the radii of the four rollers 20, 22, 24, 26 can be made equal. For example, four rollers 20, 22, 24, 2
When the turret radius TR2 of the rollers 20, 24 is equal to the turret radius TR shown in FIG. 15, the turret radius TR1 of the rollers 22, 26 is smaller than the turret radius TR = TR2. There is a need to. Specifically, (TR− (R1 / 2))
= (TR1- (R2 / 2)).
1 = TR− (R1 / 2) + (R2 / 2)

In this way, by making the diameters of the four rollers equal, the same kind of rollers can be used, so that the parallel cam device can be constructed at low cost.

In the above description, the rollers 20 and 24 are arranged point-symmetrically with respect to the center of the output shaft 80, and the rollers 22 and 26 are also arranged point-symmetrically with respect to the center of the output shaft 80. I am trying to do it. However, it is also possible to displace the rollers in the symmetrical position from the point symmetrical position by a small angle, for example, about 10 °. If the cam shape is determined under the condition that the four rollers are arranged point-symmetrically, depending on the determined cam shape, a smooth movement of the output shaft may not be obtained. In such a case, the cam surface can be redesigned by slightly displacing the roller located at the symmetric position from the point symmetric position, and the movement of the output shaft can be made smooth.

On the other hand, as shown in FIG. 2 or FIG. 15, the radius R2 of the rollers 20 and 24 and the
6, the diameter of one roller is larger than the diameter of the other roller, so that the torque generated at the contact position with the cam surface of the cam 10 can be increased. , The restraining force of the output shaft 80 can be increased.

Next, the assembling process and the adjusting process of the parallel cam device according to the present embodiment will be described with reference to FIGS. The input shaft bearing 50 is press-fitted into a bearing case 60 fixed to the housing 70 by screws.
Further, the stop ring 90, the input bearing 52, and the stop ring 91 are press-fitted. The input shaft 40 to which the cam 10 is fixed in advance is press-fitted into the inner rings of the input shaft bearings 50 and 52. After that, the O seal 95 is inserted between the bearing case 60 and the input shaft 40. Thus, the assembly of the housing 70 on the cam 10 side is completed.

The output shaft bearing 54 is press-fitted into the bearing case 62 fixed to the housing 72 by screws, and the stop ring 92, the output bearing 56, and the stop ring 93 are press-fitted. Output shaft bearings 54, 5
6, the output shaft 80 to which the rollers 20, 22, 24, 26 and the turret 30 are fixed in advance is press-fitted. After that, the O seal 96 is inserted between the bearing case 62 and the output shaft 80. With this, turret 3
The assembly of the zero-side housing 72 is completed.

The partially assembled housing 70 is assembled to the partially assembled housing 72.
At this time, the housing 72 and the housing 70 can be slightly adjusted in the direction of the arrow X shown in FIG. Therefore, the housing 70 is assembled to the housing 72 with the cam surface of the cam 10 on the housing 70 side not in contact with the rollers 20,. Thereafter, the output shaft 40 is moved in the direction of the arrow X1 in FIG. 2 to press the cam surface of the cam 10 against the rollers 20 and 22, and then the housings 70 and 72 are fixed to each other using screws, thereby assembling and adjusting. Is completed. It is sufficient for the mutual movement of the housings 70 and 72 to be about 1 mm.

As described above, the parallel cam device according to the present embodiment can easily perform assembly adjustment.
In the case where two cams are used like a conventional parallel cam device, the phase matching is required when the two cams are attached to the input shaft. Since only one cam is required,
No work such as phase matching is required. In the conventional parallel cam device, two cams and two turrets are used, so the mechanism is complicated. On the other hand, the parallel cam device of the present embodiment has one cam. And 1
Since only one turret is required, the mechanism can be simplified. As described above, according to the present embodiment, the configuration of the parallel cam device can be simplified, and the parallel cam device can be easily assembled.

Next, a parallel cam device according to a second embodiment of the present invention will be described with reference to FIGS.

In general, the parallel cam device is used as a mechanism for giving an intermittent motion, but it can also be used as a motion conversion mechanism for obtaining only a change in speed without stopping, other than the intermittent motion. Similarly, the present invention
It can be used as a motion conversion mechanism, and such a mechanism will be described below.

FIG. 16 shows the relationship between the cams and rollers of the parallel cam device according to the present embodiment. The overall configuration of the parallel cam device according to the present embodiment is the same as that shown in FIG. By changing the shape of the turret with rollers and the cam, a characteristic of continuous movement can be provided.

The rollers 120 and 124 are arranged point-symmetrically with respect to the center of the output shaft 180, and are mounted on the turret 130. The rollers 122 and 126 are also arranged point-symmetrically with respect to the center of the output shaft 180. The line connecting the rollers 120 and 124 is orthogonal to the line connecting the rollers 122 and 126. That is, the rollers 120, 122, 124, 1
26 are arranged at equal intervals of 90 ° with respect to the turret 130. The turret radii from the center of the output shaft 180 to the center of each of the rollers 120, 122, 124, 126 are all equal and TR. The diameters of the rollers 120, 122, 124, 126 are all equal to R3. Further, the input shaft 140 and the output shaft 18
Numerals 0 are arranged in parallel to form a parallel cam, and the distance between the axes is L1.

On the other hand, the cam 110 has a shape as shown in the figure, and the cam surface of the cam 110 is always in contact with at least two of the four rollers 120, 122, 124, 126. ing. That is, in the state shown in FIG. 16, the cam 110 is inscribed in the roller 120 at the contact point CP-1, and in contact with the roller 122 at the contact point CP-2. The cam 110 is always configured to restrain the roller at two or more points, and the backlash is removed. As described above, the cam 110 and the rollers 120, 122, 12
The number of contact points of 4,126 is not limited to two, but may be three.

When the input shaft 140 rotates in the direction of the arrow RA, the cam 110 contacts and presses the rollers 120 and 122 at the contact points CP-1 and CP-2, and the turret 130 on which the rollers are mounted rotates. Accordingly, the output shaft 180 to which the turret 130 is fixed is
It rotates in the direction of arrow RB.

Next, the characteristics of the parallel cam device according to the present embodiment will be described with reference to FIG. The parallel cam device according to the present embodiment has the characteristic of a non-stop curve of deformation constant velocity (MCV) without a stop angle. That is, when the input shaft rotates from 0 ° to 360 °, the output shaft rotates from 0 ° to 180 °. During this time, the input shaft and the output shaft rotate at substantially the same speed. The initial portion where the input shaft is displaced from 0 ° is at a lower speed than the speed near the middle, so that the acceleration is increased to obtain a large torque. Also, at the last portion where the input shaft is displaced up to 360 °, the speed is lower than the speed near the middle, and accordingly, the acceleration is increased to obtain a large torque.

In this embodiment, the period during which the output shaft stops as shown in FIG. 3 is not provided, and the output shaft is continuously rotated and displaced in accordance with the rotation of the input shaft.

Similarly, when the input axis is 360 ° to 720 °
When rotated to ゜, the output shaft rotates from 180 ° to 360 °. Thus, when the input shaft rotates 720 °, the output shaft rotates 360 °. Meanwhile, the rotation angle of the input shaft is 0
In the vicinity of {, 360}, 720 °, displacement at an irregular speed is shown.

As described above, according to the present embodiment, it is possible to simplify the structure of the parallel cam device having continuous speed and deformable speed characteristics, and the assembling thereof has been described with reference to FIG. This can be easily performed in the same manner as in the embodiment.

[0056]

According to the present invention, the structure of the parallel cam device can be simplified, and the assembly can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side view showing a cross section of a main part of a parallel cam device according to an embodiment of the present invention.

FIG. 2 is a front view showing a cross section of a main part of the parallel cam device according to the embodiment of the present invention.

FIG. 3 is a characteristic diagram of the parallel cam device according to the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a first contact state between a cam and a turret of the parallel cam device according to one embodiment of the present invention.

FIG. 5 is a schematic diagram showing a second contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 6 is a schematic diagram showing a third contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 7 is a schematic diagram showing a fourth contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 8 is a schematic diagram showing a fifth contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 9 is a schematic diagram showing a sixth contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 10 is a schematic diagram showing a seventh contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 11 is a schematic diagram showing an eighth contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 12 is a schematic diagram showing a ninth contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 13 is a schematic diagram showing a tenth contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 14 is a schematic diagram showing an eleventh contact state between the cam and the turret of the parallel cam device according to one embodiment of the present invention.

FIG. 15 is an explanatory diagram of a cam shape used for the parallel cam device according to one embodiment of the present invention.

FIG. 16 is an explanatory diagram of a relationship between a cam and a roller of the parallel cam device according to the second embodiment of the present invention.

FIG. 17 is a characteristic diagram of the parallel cam device according to the second embodiment of the present invention.

[Explanation of symbols]

10, 110 ... cam 20, 22, 24, 26, 120, 122, 124, 1
26 ... rollers 30, 130 ... turrets 40, 140 ... input shafts 50, 52 ... input shaft bearings 60, 62 ... bearing cases 70, 72 ... housings 80, 180 ... output shafts 90, 91, 92, 93 ... stop rings 92 95 , 96 ... O seal

Claims (5)

[Claims] 1. A turret fixed to an input shaft and one turret fixed to an output shaft and having a plurality of rollers attached thereto, wherein the cam surface of the cam is the one turret. The turret is constrained by constantly contacting two or more of the plurality of rollers attached to the turret, and the cam comes into contact with the rollers as the input shaft rotates, so that the turret and the output A parallel cam device characterized by rotating a shaft. 2. The parallel cam device according to claim 1, wherein the cam surface of the cam has a stop angle portion that does not accompany the rotational displacement of the output shaft with respect to the rotational displacement of the input shaft. Parallel cam device. 3. The parallel cam device according to claim 1, wherein the plurality of rollers are composed of two sets of four rollers, and the first set of two rollers is the output having the turret attached thereto. A parallel cam device, wherein the two rollers of the second set are arranged point-symmetrically with respect to the center of the output shaft on which the turret is mounted, the point being arranged symmetrically with respect to the center of the shaft. . 4. The parallel cam device according to claim 3, wherein the diameter of the first set of rollers is larger than the diameter of the second set of rollers. 5. The parallel cam device according to claim 3, wherein said four rollers have the same diameter.