JPS6065949A - Cam device - Google Patents

Abstract

PURPOSE:To simplify construction by enabling output members to move both in the longitudinal and lateral directions by using a single composite cam having a non-circular endless groove cam and a circular end cam whose depth varies continuously, in a cam device for an automatic assembling machine, etc. CONSTITUTION:In the cam device, which drives more than one output member 7, of an automatic assembling machine, etc., a hollow fixed sleeve 4 is inserted and fixed in the opening part 1a of a housing 1, and an output-member supporting table 2 is fixed on the upper end of this sleeve 4, while its lower end is fixed on a fixing member 3. A continuous rotary shaft 5 is inserted through the sleeve 4, and a disk-type composite cam 6 is fixed on the top of the shaft 5. On the output member 7 provided on the supporting table 2, is provided a mounting block 16 which is supported, through guide bars 15a, 15b, by a sliding block 13 which is elevatable along a vertical guide bar 12. The guide bar 15a and the sliding block 13 are guided by the groove 8 and the end cam 9, through contact members 10, 11, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cam device used in various devices that automatically perform various operations such as assembly, processing, supply, transfer, and unloading.

Here, the cam device refers to a cam mechanism that enables an output member that performs various operations to perform predetermined complicated operations.

As a cam device of this type previously proposed by the present applicant, there is an invention described in Japanese Patent Publication No. 55-4978. The cam device shown in this Japanese Patent Publication No. 55-4978, particularly in FIG. Arrangement 1: Each globoidal cam is provided with a tapered rib forming a predetermined geometrical curve, and corresponding to the globoidal cam, first and second ribs are provided which are perpendicular to the input shaft and parallel to each other. a follower shaft is rotatably supported in the housing, first and second follower turrets are fixedly attached to the first and second follower shafts, and on the periphery of each follower turret. A cam follower is provided to sandwich the tapered rib of each globoidal cam from both sides, and an arm is fixed to each of the first and second follower shafts to cause the output member to perform a compound motion of two linear motions via a guide member. This is what I did.

However, since such a cam device requires the use of two globoidal cams, the number of parts increases, resulting in problems such as a complicated structure, an increase in size, and an increase in cost.

The present invention was made in order to solve the above-mentioned problems.The purpose of the present invention is to convert the continuous rotational movement of a continuous rotating shaft into horizontal reciprocating movement and vertical movement using a single composite cam. The purpose of the present invention is to provide a cam device that can transmit the same information to an output member, has a simple structure, can be made smaller, and can be lowered in cost. It is an object of the present invention to provide a cam device suitable for use in an automatic assembly (processing) machine to cause each unit to perform a desired movement.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the examples detailed below, a case will be explained in which the cam device of the present application is applied to a big-and-place unit as an output member, but the output member in the present invention is not limited to a big-and-place unit, and the following It can be applied to various output 31 members that require complex movements as described above.

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

1 and 2 are configuration explanatory diagrams of an embodiment of the cam device of the present invention applied to a big-and-place unit, where FIG. 1 is a plan view and FIG. 2 is a longitudinal sectional view. . The cam device includes a housing 1 and an opening 1 of the housing 1.
The outer periphery is fixed inside a, and the output member holding table 2 is attached at the upper end.
a hollow fixed sleeve 4 whose lower end is fixedly supported by a fixed member 3; a continuous rotating shaft 5 disposed axially penetrating the inner hollow part of the fixed sleeve 4; It has a disc-shaped composite cam 6 fixedly supported at the upper end, and an output member (big-and-place unit in this embodiment) 7 fixed on the holding table 2. Composite cam 6
The upper surface is carved with an endless, non-circular grooved cam 8 located on the inner diameter side, and a circular end face cam 9 located on the outer diameter side of the grooved cam 8 and formed along the outer peripheral edge. , holding table 2
Multiple pick-and-plays fixed in place on 4
- the first contact 10 and the second contact 11 of the unit 7 are configured to engage in each cam 8.9 and to be movable along the respective cam 8.9;

As shown most clearly in FIGS. 4 and 5, the grooved cam 8 includes a small diameter arc portion 8b, a large diameter arc portion 8d, and a non-circular portion 3.
a, 3c, and the bottom surface of the end cam 9 has a deep part ((~a, f-g section) and a shallow part (c-d, i).
~j section) and the slope connecting these (j-A, a~
c, d-f,,g~1 section), the first contact 10 is vertically movable within the groove cam 8, and the second contact 11 is attached to the bottom surface of the end cam 9. It is designed to roll along.

The big and place unit 7 includes a first guide rod 12 fixed vertically to the holding table 2;
An L-shaped sliding block 13 is inserted and supported so as to be slidable in the vertical direction, and one end is locked to the upper end of the first guide rod 12 to urge the sliding block 13 downward (in the direction of the holding table 2). A pair of second guide rods 15a extend horizontally (in a direction parallel to the surface of the compound cam 6) and are inserted into and supported by the spring 14 and the sliding block 13 so as to be slidable in the left and right directions.

15b. A pair of second guide rods 15a.

15b are arranged in a vertical positional relationship along a radial straight line passing through the rotational axis of the compound cam 6, and a mounting block for mounting various chuck means (not shown) on the outer diameter side end thereof. 16 is fixed. Upper guide rod 1
The first contact 1o that rolls within the cam groove 8 is attached to the inner end of the opening block 13, and the second contact 11 that rolls within the end cam 9 is attached to the inner surface of the opening block 13. axis 1
1a. Since the first contactor 10 moves on a trajectory along the non-circular grooved cam 8 as shown in FIG. 4, the mounting block 16 can be moved in the inner and outer radial directions. Since the second contactor 11 moves on a trajectory along the circular end cam 9, it does not itself cause displacement in the inner and outer radial directions, but the bottom surface of the end cam 9 as shown in FIG. It moves up and down in accordance with the shape, displacing the sliding block 13 and the mounting block 16 in the up and down direction. Such a second guide rod 15a.

The radial reciprocating motion of the mounting block 15b and the vertical reciprocating motion of the sliding block 13 are combined, allowing the mounting block 16 to perform the desired big-and-place motion.

Next, the operation of the cam device with the above configuration will be explained based on the timing diagram of FIG. 6. The timing diagram in FIG. 6 shows the vertical and radial reciprocating states of each of the five big-and-place units 7 and the relationship between each operating partner.

For the sake of convenience, only the timing diagram of the big-and-place unit 7 indicated by the symbol ``■'' in FIG. 1 will be explained using the symbol a-1. Figure 4.

The symbols a to β in FIG. 5 correspond to the symbols a to β in FIG. 6, respectively. The other big-and-place units 7 indicated by symbols ■ to ■ have different installation positions from the unit in ■, and each performs the same operation with different timing. Therefore, only the unit in ■ will be explained, and the other units will not be explained. Omit duplicate explanations.

7- First, the big-and-place unit (2) shown in FIGS. 1 and 2 is located in the section i to j in FIG. i~
In section j, the first contact 10 is located at the first non-circular portion 8a of the grooved cam 8, so the guide rod 15a is located at the composite cam 6.
As the guide rod 15b and the block 16 rotate, they are displaced in the inner diameter direction, and integrally with this, the guide rod 15b and the block 16 are also displaced in the inner diameter direction. In this section, the bottom surface of the end cam 9 is at a shallow portion and is a flat surface, so the second contactor 11 is at the uppermost position. Therefore,
Mounting block 16 is also held in the uppermost position. In the section j~, the first contactor 10 is located near the end of the non-circular portion 8a, so it continues to be displaced in the inner radial direction;
The second contactor 11 enters the lowering area (slanted part) of the end cam 9 and begins to descend. Therefore, in the j- section, the block 16 performs a downward movement while moving in the inner radial direction. k~! In this section, the first contact 10 enters the small-diameter arc portion 8b of the grooved cam 8, so the displacement of the block 16 in the radial direction stops; 8- Continue descending, reaching the lowest position at position β and stopping the descent. In the section β to a, the first contact 10 is located at the small diameter arc portion 8b of the grooved cam 8, and the second contact 11 moves deep within the end cam 9, so the block 16 is at the innermost diameter position and at the lowest position. It is in a stopped state. In the section a-b, the first contact 10 is still located in the small diameter arc portion 8b, and the second contact 11 enters the rising area (slanted part), so the mounting block 16 starts rising while being at the innermost diameter position. . In the section b to C, the first contact 10 enters the non-circular part 8C, and the second contact 11
Since the block 16 is in the rising area (slanted part), the block 16 continues to rise while starting to be displaced in the outer radial direction. In the section C to d, the first contact 10 is in the non-circular part 80, and the second contact 1
1 is at a shallow portion, the mounting block 16 continues to move in the outer radial direction while being at the highest position. In the section d to e, the first contact 10 is still in the non-circular part 8C, and the second contact 1'1 enters the descending area (slanted part), so the block 16
continues to move further toward the outer diameter while starting to descend. e
In the ~f section, the first contact 10 enters the large-diameter inner arc portion 8d, and the second contact 11 is located on the slope, so the block 1
No. 6 continues to descend while being located at the outermost diameter portion. In the fQ section, the first contact 10 is still within the large-diameter arc portion 8d, and the second contact 11 enters the deep part, so the block 16 is stopped at the outermost diameter position and the lowest position. In the gh section, the first contact 10 is within the large diameter arc portion 8d and the second contact 11 enters the upper boundary area, so the block 16 is at the outermost position and starts to rise. In the h-i section, the first contact 10 enters the non-arc portion 8a, and the second contact 11 is still in the rising area, so the block 16 moves in the inner diameter direction while continuing to rise.

This section is continuously connected to the i-j section, and thereafter each operation in each section described above is repeated in sequence.

The big-and-place units with symbols ■ to ■ perform similar operations at timings delayed by the same angle as the angle between the mounting positions of each unit. Then, in each unit, a chuck (not shown) grasps the workpiece from the feeder when the mounting block 16 is at the outermost diameter position and the lowest position, and when the mounting block 16 is at the innermost diameter position and the lowest position, the chuck (not shown) grasps the workpiece. A chuck places a workpiece on a work table (not shown).

In the above embodiment, five big-and-place units 7 as output members are arranged outside the composite cam 6, but it goes without saying that the number of the units is not limited to this, and as necessary. Any number of units (including a single unit) can be arranged according to the requirements. Furthermore, as described above, the output member to which the desired motion is transmitted by the compound cam 6 is not limited to the big-and-place unit in the above embodiment, but may have a compound motion of vertical motion and horizontal (radial) motion. A variety of output members may be used with the composite cam 6 as required.

Further, in the above embodiment, there is only one composite cam 6, but
It is also possible to arrange a plurality of such composite cams in parallel on a continuous rotating shaft, and in that case, a cam device that combines output members with different radial movement and vertical movement may be used. I can do it.

11-Furthermore, regarding the cam curve of the composite cam 6, in the illustrated embodiment, the output member performs one operation by rotating the groove cam 8 and the end cam 9 by 360 degrees. For example, it is also possible to perform one operation by rotating 180 degrees.

As can be understood from the above description, the cam device according to the present invention provides the following effects.

(1) A single compound cam fixed to a continuous rotating shaft allows the output member to perform compound movements in the vertical and horizontal directions, and the structure of the compound cam itself is relatively simple, so the entire device Smaller size and lower cost. Furthermore, multiple output members can be driven by a single compound cam. Therefore, it is particularly suitable for use as a drive means for a big-and-place unit.

(2) Since a large-diameter cam can be used, the ratio of the cam diameter to the stroke becomes large, and the degree of freedom in timing can be increased.

13-12- (3) The grooved cam carved on the composite cam and the end cam serve as a direct output, and the characteristics of the cam appear in the output as they are, so the movement and accuracy of the final end are good.

As described above, according to the cam device according to the present invention, an endless groove cam consisting of an arcuate portion and a non-arc-shaped portion is provided on the upper surface of the disc-shaped composite cam fixed to the continuous rotating shaft, and A first contact with at least one output member whose bottom surface forms an end face cam having a shallow part, a deep part, and an inclined part connecting these parts, and is supported so as to be movable in the radial direction and vertical direction with respect to the composite cam. and a second contact, the first contact is engaged in a movable and vertically movable manner within the grooved cam, and the second contact is engaged with the end cam along the bottom surface. The continuous rotation of the composite cam allows the output member to perform a composite movement in the radial direction and the vertical direction. This has excellent effects such as making it possible to downsize the device and reduce costs.

Further, the output member includes a first guide rod fixedly supported with respect to the housing and extending in the vertical direction;
a sliding block supported vertically movably on a guide rod; and a second guide rod supported movably in the radial direction of the compound cam by the sliding block, and the first contactor is attached to the inner diameter end of the second guide rod and
When the guide rod is moved in the radial direction and the second contactor is attached to the sliding block to move the sliding block in the vertical direction, the configuration of the output member is also relatively simple. This makes it possible to arrange a plurality of output members without increasing the size of the entire device, and in particular, it is possible to fix the chuck mounting block to the outer diameter end of the second guide rod. In other words, it is suitable for use as a big-and-place unit.

[Brief explanation of drawings]

1 and 2 are a plan view and a vertical sectional view of a cam device according to an embodiment of the present invention, FIG. 3 is a partially enlarged sectional view of FIG. 2, and FIGS. 4 and 5 (A). , (B) are explanatory diagrams of the composite cam, FIG. 4 is a plan view, and FIG. 5 (A) is a side view thereof.
(b) is a developed explanatory diagram of the end cam, and Fig. 6 <a> to (
e) is a timing diagram showing the operations of the output members (2) to (3), respectively. 1・・・・・・・・・Housing 5・・・・・・・・・
・Continuous rotation axis 6...Compound cam 7...
...Output member 8 ...Groove cam 9
......End cam 10...First contact 11...Second contact 12...
First guide rod 13...Sliding block 15a,
15b...Second guide rod 16...Chuck mounting block Patent applicant Sankyo Seisakusho Co., Ltd. Representative Patent attorney - Kensuke Shiro

Claims (3)

[Claims] (1) A continuous rotary shaft that is driven to rotate continuously is rotatably supported in a housing, a disc-shaped composite cam is fixed to one end of the continuous rotation shaft, and on the upper surface of the composite cam, An endless groove cam consisting of a circular arc portion and a non-circular portion, and an endless end face cam whose bottom surface has a shallow portion, a deep portion, and an inclined portion connecting these portions, and the composite cam At least one output member supported to be movable in the radial direction and vertical direction is provided with a first contact and a second contact, and the first contact is movable within the groove cam and is movable in the vertical direction. At the same time, the second contact is engaged with the end cam so as to be movable along the bottom surface, and continuous rotation of the composite cam causes the output member to have a composite radial and vertical direction. A cam device characterized by causing movement. (2) The output member includes a first guide rod that is fixedly supported with respect to the housing and extends in the vertical direction;
a sliding block that is vertically movably supported by a guide rod; and a second guide rod that is slidably supported by the sliding block in a radial direction of the composite cam, and the first contactor is attached to the inner diameter end of the second guide rod and
2. The cam according to claim 1, wherein the guide rod is moved in the radial direction, and the second contact is attached to the sliding block to move the sliding block in the vertical direction. Device. (3) The cam device according to claim 2, wherein a chuck mounting block is fixed to the outer diameter side end of the second guide rod.