JPS6153580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a cam device used in a drive portion of a stroke switching type transfer unit of automatic assembly equipment.

Structure of the conventional example and its problems As shown in the specific structure of the conventional stroke switching type cam device in FIG. The stroke of the reciprocating motion of the head 6 is changed by driving the cylinder 4. With such a configuration, movement by driving the cylinder is required at the time of stroke switching, and there is a problem that the impact is large when the movement of the cylinder ends, and the movement time cannot be made shorter than the operation time of the cylinder.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned conventional drawbacks, and aims at increasing the accuracy and speed of a stroke switching type cam device.

Structure of the Invention The present invention provides a grooved cam that has two types of cam curves and produces two types of displacement through rotation, a cam roller and a cam lever that convert the displacement generated by the grooved cam into reciprocating motion, and a head that converts the reciprocating motion. It consists of a drive transmission unit that selects one of two types of cam surfaces and presses the cam roller against the selected cam surface, a cam shaft to which the cam is attached, and a drive section that drives the cam shaft. This is extremely advantageous in increasing the precision and speed of the cam device.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In the figure, 7 is the chuck that works, 8 is the head that holds the chuck 7 and moves up and down and back and forth, 9 is the slide shaft that transmits the drive of the back and forth movement of the head 8, and 10 is the chuck that moves the head 8 up and down. A guide shaft 11 has a slide bearing 12, holds the slide shaft 9 and moves up and down according to the guide shaft 10, 13 is a block that transmits the drive of the cam lever 14 to the shaft 9, 15 is a cam roller, 16 30 has two types of cam surfaces and is a grooved cam that can drive the head 8 in two types of displacement amounts in the front and rear directions. The pressing air cylinder 17 has a cam roller 19,
A lever that drives the block 11 up and down according to the amount of displacement of the plate cam 20; 18 is a tension spring that presses the cam roller 19 against the plate cam 20; 21 is the lever 1;
roller 22 that transmits the drive of 4 to block 13;
23 is a roller that transmits the drive of the lever 17 to the block 11; 23 is a camshaft 24; a roller chain that transmits the drive of the drive motor 25 to the camshaft 23; 26 is the main body frame; 27, 28, and 29 are the levers 17;
These are pins for attaching the lever 14 and air cylinder 30, respectively.

In the above configuration, the drive of the motor 25 is transmitted to the camshaft 23 via the roller chain 24,
Rotate the grooved cam 16 and plate cam 20, and rotate the cam roller 15, lever 14, roller 21, and block 1.
3. Move the head 8 back and forth via the slide shaft 9, and similarly move the cam roller 19 and lever 1.
7. The head 8 is moved up and down via the rollers 22 and the block 11. At this time, by selecting the operating direction of the air cylinder 30 operated by high-pressure air in the X direction or the Y direction, the cam surface that the cam roller 15 contacts within the groove of the grooved cam 16 is switched,
The amount of displacement of the cam 16 changes, and the stroke of the back and forth movement of the head 8 is switched.

Effects of the Invention As described above, the present invention switches the stroke of the head by switching the displacement of the cam by selecting two types of cam surfaces in the grooved cam using the cylinder, so the timing after switching also changes according to the cam curve. This has an extremely large effect on increasing precision and speed of movement.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional cam device, Fig. 2 is a front view of a cam device according to an embodiment of the present invention, Fig. 3 is a plan view of the same, and Fig. 4 is a sectional view of the grooved cam of the above. . 9...Slide shaft, 13...Block,
14...Cam lever, 15...Cam roller, 1
6...Groove cam, 21...Roller, 23...Camshaft, 24...Roller chain, 25...Motor, 29...Pin, 30...Air cylinder.

Claims (1)

[Claims] 1 It has two types of cam surfaces: a cam surface created by the side surface of the groove on the camshaft side, and a cam surface created by the other outer peripheral side surface of the groove that faces and is located on the opposite side of the cam surface. A grooved cam that can create two types of displacement, and a cam that selects one of the two types of cam surfaces and moves the cam roller located in the groove via the cam lever. An air cylinder that presses against the surface,
A cam device consisting of a drive transmission section that converts the displacement produced by the grooved cam into reciprocating motion and transmits it to the head, a camshaft to which the grooved cam is attached, and a drive section that drives the camshaft.