JPS6336205Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cam device, and more specifically, to an improvement of the "cam device" that the present applicant previously filed in Utility Model Application No. 55-62505.

The above-mentioned "cam device" according to Utility Application No. 55-62505 has two output shafts driven by one input shaft, and one of the output shafts is driven by a cam that increases and decelerates the rotation. The rotation angle of the output shaft can be set over a wide range, the other output shaft rotates at a constant speed and is synchronized with the cam timing, and its rotation ratio can be set freely, so synchronous rotation is not required. By incorporating this cam device into a conveying device, the mechanical configuration can be simplified.

However, in the above-mentioned "cam device", two plate cams are attached to the camshaft, and the plate cams interact with a plurality of rollers rotatably supported between turret discs to rotate the turret shaft intermittently. Since the torque is transmitted by the two plate cams, there are relatively few contact points between the plate cam and the roller. For this reason, for example, if a part of the cam is smaller than the minimum radius of curvature of the cutter diameter and so-called "cutting down" occurs during machining of the cam, accurate rotational drive of the turret shaft can be expected with products that use such plate cams. become unable.

Therefore, the present invention improves the above-mentioned "cam device" so that even if undercutting occurs during cam processing, the movement by the plate cam is compensated, and accurate rotational drive of the turret shaft can be obtained. To provide cam device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

In FIGS. 1 and 2, an input shaft 2 is rotatably supported between one opposing side wall 1a and 1b of a case 1, and a pinion gear 3 is fixed to an intermediate portion of the input shaft 2. . The pinion gear 3 meshes with a worm gear 5 of a first output shaft 4, and this output shaft 4 is rotatably supported between the other opposing side walls 1c-1d of the case 1, with one end protruding outward. ing. A first gear 6 is further fixed to this first output shaft 4, and this gear 6 meshes with a large-diameter gear 8 fixed to a camshaft 7, so as to be rotatable between side walls 1c and 1d of the case. The supported camshaft 7 is rotated. Three plate cams 9a, 9b, and 9c are fixed to the camshaft 7 in parallel. These plate cams are arranged within the same diameter circle,
Each plate cam consists of an arcuate portion on the circumference and a curved portion curved into the circumference, and are attached with mutually shifted phases. This plate cam 9a,
Four turret disks 10 adjacent to 9b and 9c
a, 10b, 10c, and 10d are integrally provided on the turret shaft 11 at intervals from each other.
between adjacent turret discs, i.e. 10a-10
Two rollers 12 are rotatably supported on the turret disk between each of b, 10b-10c, and 10c-10d, and these two rollers 12 are arranged at equal intervals on the same circumference, making a total of 6 rollers 12. As shown in FIG. 1, the rollers 12 are arranged in a circular row of rollers when viewed on the same plane. The curved portion and the arcuate portion of the plate cam enter between the turret disks during rotation, and the turret disk 10a-
10d is configured to rotate around its turret shaft 11. Turret disk 10
The outer diameters of a-10d are all the same, and a gear 13 is formed on the outer periphery thereof, and this gear 13 meshes with the gear 15 of the second output shaft 14. This output shaft is rotatably supported between the side walls 1c and 1d of the case 1, and one end thereof projects outward on the same side as the first output shaft.

Describing the operation of the cam device having the above configuration, first, the rotation of the input shaft 2 is transmitted to the first output shaft 4 as constant velocity rotation at a reduced speed through the meshing of the pinion gear 3 and the worm gear 5. . The rotation of the output shaft 4 is transmitted as rotation of the camshaft which is further reduced in speed by the gear 6 attached thereto meshing with the large-diameter gear 8 of the camshaft 7. Three plate cams 9 are fixed to the camshaft 7 as it rotates.
a-9c rotates. Each plate cam rotates in contact with a roller 12 between the turret disks 10a-10d, and when the roller 12 is pressed in the rotation direction of the plate cam between its curved part and circular arc part as the plate cam rotates. When the turret shaft 11 that rotates intermittently rotates, the outer periphery of the turret disc that is integrally attached to the turret shaft 11 is rotated by the gear 15.
Since the second output shaft 14 is in mesh with the second output shaft 14, the second output shaft 14 is intermittently rotationally driven. At this time, the gear 13 of the turret disc and the gear 1 of the second output shaft meshing with the gear 13
The second output shaft 14 increases or decelerates the rotation of the turret shaft 11 by appropriately selecting the gear ratio of 5.
rotation can be obtained. Furthermore, at this time, the second
The rotation direction of the output shaft 14 is opposite to that of the first output shaft.

As described above, in the cam device of the present invention, the first output shaft 4 rotates at a constant speed, and the cam device rotates at a constant speed and at an inconstant speed, similarly to the "cam device" according to Utility Application No. 55-62505 filed by the present applicant. By appropriately designing the gear ratio of the gear 13 of the turret disk and the gear 15 of the second output shaft that meshes with the gear 13 of the turret disk, the second output In addition to the effect of easily speeding up or decelerating the rotation of the shaft, at least three plate cams 9a to 9c are attached to the camshaft 7 and rotatably supported between the turret disks. Since the plate cam interacts with multiple rollers 12, the number of contact points between the plate cam and the rollers is increased compared to the "cam device" of the earlier application, so the cam timing overlaps, so even if "cutting down" occurs during cam processing. , multiple rollers are involved in the other cam surfaces that are not "undercut", thereby compensating the motion and allowing accurate rotation. Additionally, since multiple rollers are involved in the increased number of plate cams, the load torque can be shared, resulting in even better output torque characteristics, and even when used as an indexing device, stopping accuracy is improved. This results in an improved cam device.

Furthermore, when all the plate cams 9a to 9c are arranged within a circumference of the same diameter, and each plate cam is composed of a circular arc portion on this circumference and a curved portion curved into this circumference, , all these plate cams 9a to 9c are connected to the first
This gear 8 is adjacent to the gear 8 that meshes with the output shaft of
Since the device can be arranged within a circumference having approximately the same diameter, the device can be made compact.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the cam device according to the present invention;
Figure 2 is a sectional view taken along the - line in Figure 1;
The figure is a partial sectional view showing the arrangement of the cam plate and rollers used in this device, and FIG. 4 is a sectional view taken along the - line in FIG. 3. 1... Case, 2... Input shaft, 3... Pinion gear, 4... First output shaft, 5... Worm gear, 6, 8, 15... Gear, 7... Camshaft, 9a
-9c...Plate cam, 10a-10d...Turret disk, 11...Turret shaft, 12...Roller, 14...Second output shaft.

Claims (1)

[Claims for Utility Model Registration] (1) An input shaft is drivingly coupled to a first output shaft via a pinion/worm gear, and the rotation of the input shaft is transmitted as uniform rotation of the first output shaft; The first
The output shaft of the camshaft is rotatably connected to a camshaft through a pair of gears, and at least three plate cams are attached to the camshaft, each plate cam being formed of an arc portion and a curved portion, and forming a turret disk. The turret shaft is intermittently rotated by acting on a plurality of rollers rotatably supported between them, and the gear portion formed on the outer periphery of the turret disc meshes with the gear of the second output shaft to generate the second output shaft. A cam device characterized by intermittent rotation of an output shaft. (2) Practical use characterized in that all of the plate cams are arranged within a circumference of the same diameter, and each plate cam consists of a circular arc portion on the circumference and a curved portion curved into the circumference. A cam device according to claim 1 of the patent registration claim.