JPS6020627B2 - cylindrical cam - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cylindrical cam having two right-handed and left-handed guide paths on its circumferential surface for converting rotational motion into linear reciprocating motion.

BACKGROUND OF THE INVENTION Generally, a synthetic resin cylindrical cam having a single spiral guide path on its outer periphery is manufactured by injection molding.

In other words, a synthetic resin is injected into the mold and cured, and after curing, the mold or the molded product is rotated along the guide path.
The molded product can be removed from the mold. However, in the case of a cylindrical cam in which two guide paths in opposite directions are formed so as to intersect with each other, the above-mentioned rotational extraction is of course impossible, and injection molding cannot be performed.

For this reason, conventional cylindrical cams having two guide paths have been manufactured by machining the outer periphery of the cylindrical body. Therefore, compared to injection molding, it takes much more effort and time, leading to a significant increase in manufacturing costs. OBJECTS OF THE INVENTION It is an object of the present invention to provide a cylindrical cam that can be manufactured very easily and inexpensively despite having both stone-wound and wound guide paths.

EXAMPLE Hereinafter, an example embodying the present invention will be explained based on the drawings.A cylindrical cam 1 of this example is molded from a synthetic resin such as polyacetal, and the outer periphery of a single main shaft 2 having a circular cross section. The iron is inserted into the
It is fixed so that it cannot rotate or move in the vertical direction.

On the outer circumferential surface of the cylindrical cam 1, stone-wound and left-handed cam registers 4 and 5 are formed as guide paths for guiding a reciprocating traveler (not shown), and at both ends there are formed stone-wound and left-wound cam registers 4 and 5. Teeth 6 are formed which are connected to a drive mechanism for transmitting rotation. Both cam grooves 4 and 5 have a spiral groove 7 located in the middle and both cam registers 4 located at both ends.
.

Therefore, if the main rod 2 is rotatably supported, a part of the traveler is engaged with the cam groove, and the cylindrical cam 1 is rotated in one direction, the traveler is moved into the spiral groove part 7 of the cam grooves 4 and 5. The annular part 8 moves left and right based on the cam action.
It is then reversed and reciprocated within a certain range. Furthermore, this cylindrical cam 1 includes a pair of left and right first segments 9 shown in FIGS. 3 a to d, a second pair of left and right segments 10 shown in FIGS. 4 a to d, and a pair of left and right second segments 10 shown in FIGS.
It is constructed by combining a large number of third segments 11 shown in c. Each of these segments 9, 10, 11 has a cylindrical shape and is provided with an insertion hole 12 having a circular cross section into which the main shaft 2 is inserted. form both ends of the cylindrical cam 1,
The tooth portion 6 is formed on the end face of the circumferential shaft portion on one side, and a positioning surface 13 is formed on the end face of the circumferential shaft portion on the other side.
The second segment 10 shown in FIGS. 4a to 4d is disposed inside the first segment 9, and has an end surface on one side of the shaft circumferential portion that cooperates with the positioning surface 13 of the first segment 9. A positioning surface 14 for positioning the second segment 10 of the lever is formed, and a positioning surface 15 that is oblique with respect to the axial direction is formed on the end surface of the other shaft peripheral portion.

Furthermore, the third segments 11 shown in FIGS. 5a to 5c are arranged so as to overlap vertically between the second segments 10, and the end surfaces of the axial portions on both sides are provided with oblique lines so as to converge with each other. Shape-shaped positioning surfaces 16 are formed, and these positioning surfaces 16 mutually engage with the oblique positioning surface 15 of the adjacent second segment IC or the positioning surface 16 of another adjacent third segment 11. The third segment 11 of the lever is fixed relative to each other in a predetermined position so as not to rotate relative to each other. One side surface 8a of the annular groove 8 is formed on the positioning surface 13 side of the first segment 9 along the circumference of the outer end surface of the circumferential portion thereof.

On the positioning surface 14 side of the second segment 10, a bottom surface 8b and the other side surface 8c of the annular groove 8 are formed along the outer end surface of the circumferential portion. On both sides of the third segment 11, one side surface Ta of the helical groove 7 between the intersections of the helical groove 8 is provided along the outer end surface of the axial circumferential portion.
and a side half of the bottom surface 7b. Therefore, no intersection of the spiral grooves 7 is formed in any of the segments 9, 10, 11. In this way, each segment 9,1
0 and 11 are provided with only a portion of the cam grooves 4 and 5 on both sides, and no intersecting portions, so they can be easily manufactured by injection molding. To assemble these to form the cylindrical cam 1, as shown in FIGS. 1 and 2, each segment 9, 10, 11 is inserted into the main shaft 2, and their positioning surfaces 13 to 16 are It is sufficient to engage the positioning surfaces 13 to 16 of the other adjacent segments 9, 10, 11 and fix them with the striping rings 3 on both sides. Also, relative rotation between the main shaft 2 and the cylindrical cam 1 is prevented, and the cylindrical cam 1 is fixed to the main shaft 2. At this time, in particular, since the oblique positioners 16 are formed on both end faces of the third segment 11 so as to converge on each other, the main shaft 2 is rotated while accurately inverting the third segment 11 by 180 degrees.
There is no need to sequentially insert the iron into the two segments, and by pressing the iron into the adjacent third segment 11 on the main shaft 2 after inserting the iron in any rotational state, the inserted segment can be removed by the engagement of the positioning surfaces 16 of both segments 11. 11 are rotated and placed in an alternately inverted state as shown in FIG. 1, making assembly extremely easy.

Further, since the main shaft 2 and the insertion holes 12 of each of the segments 9 to 11 have a circular cross-sectional shape, the manufacturing process can be easily performed. In this way, two
A cylindrical cam with guide paths in opposite directions can be manufactured very easily. It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the spirit of the invention, such as using protrusions instead of the cam registers of the above-mentioned embodiments as guide paths.

Effects of the Invention As exemplified in the embodiments above, the present invention consists of a plurality of segments of the same shape that are penetrated by a single shaft with a circular cross section, except for both end portions of the cylindrical cam, and the segments are It has a cylindrical shape with a hole having a circular cross section in the center, and on the end face of its circumferential portion, oblique positioning surfaces for positioning in the rotational direction between adjacent segments are arranged so that they converge on each other. By configuring it so that the right-handed and left-handed guide path portions are formed continuously along the outer end surface of the shaft circumferential portion, stone-wrapped and left-handed guide paths are provided. Despite the fact that it is extremely easy to manufacture and assemble,
Demonstrates a blinding effect that can reduce costs.

[Brief explanation of the drawing]

Figure 1 is a front view of a cylindrical cam embodying this invention;
The figure is also a plan view, and Figures 3 a to d are a front view, left side view, right side view, and cross-sectional view of the first segment, and the fourth
Figures a to d are the front view, left side view, right side view, and sectional view of the second segment, respectively, and Figures a to c are the third segment, respectively.
They are a front view, left and right side views, and a sectional view of the segment. Cylindrical cam...1, main shaft...2, cam register...4,5
, third segment...11, side...7a, bottom...7b,
Insertion hole...12, positioning surface...16. Figure 3 5
Figure Snake Diagram N Vertical Figure 4

Claims (1)

[Claims] 1 In a cylindrical cam 1 which has both right-handed and left-handed guide paths 4 and 5 on its circumferential surface for converting rotational motion into linear reciprocating motion, one shaft with a circular cross section except for both end portions of the cylindrical cam 1. The segment 1 is composed of a plurality of segments 11 having the same shape and penetrates through the segment 1.
1 has a cylindrical shape with a hole 12 having a circular cross section in the center, and on the end face of the shaft circumferential portion on both sides thereof, there are oblique positioning surfaces 16 for positioning in the rotational direction between adjacent other segments. A cylindrical cam characterized in that the cylindrical cam is formed so as to converge with each other, and further has right-handed and left-handed guide path portions 7a and 7b continuously formed along the outer end surface of the axial circumferential portion.